84 results on '"C.J. Chang"'
Search Results
2. Delivery and turnover of plasma-derived essential PUFAs in mammalian brain
- Author
-
Stanley I. Rapoport, Michael C.J. Chang, and Arthur A. Spector
- Subjects
nutrition ,phospholipids ,metabolism ,incorporation ,transport ,blood-brain barrier ,Biochemistry ,QD415-436 - Abstract
Polyunsaturated fatty acids (PUFAs) are critical to nervous system function and structure, but their rates of incorporation from plasma into brain have not been evaluated. In the adult rat, calculations based on our model show that at least 3–5% of esterified brain arachidonic acid (AA) and 2–8% of esterified brain docosahexaenoic acid (DHA) are replaced daily by unesterified PUFAs in plasma. These rates, when related to unlabeled brain PUFA composition, give half-lives of 1–2 weeks for plasma-brain exchange of AA and DHA. In the human brain, the arachidonate replacement rate is 0.3% per day.Although unesterified plasma PUFA concentrations are low, their rates of incorporation into brain are sufficient to compensate for metabolic and efflux losses, so that PUFA transport from plasma into brain as a component of a lipoprotein is unnecessary. Dietary supplementation, by altering plasma unesterified PUFA concentrations, can regulate brain PUFA content and may help to treat brain diseases involving PUFA imbalance.
- Published
- 2001
- Full Text
- View/download PDF
3. IDF21-0022 The non-invasive spectrum analysis of the radial pulse for renal function loss in patients with type 2 diabetes
- Author
-
Y. Chen, K.M. Liao, S.H. Wang, C.J. Chang, G.C. Wang, and T.C. Wang
- Subjects
Endocrinology ,Endocrinology, Diabetes and Metabolism ,Internal Medicine ,General Medicine - Published
- 2022
- Full Text
- View/download PDF
4. The Global Phosphorylation Landscape of SARS-CoV-2 Infection
- Author
-
Yiming Cai, Maya Modak, Sebastian Weigang, Emmie de Wit, Jean K. Lim, Alistair Dunham, Benjamin J. Polacco, Qiongyu Li, Svenja Ulferts, Gwendolyn M. Jang, Aurelien Dugourd, David E. Gordon, Jeffrey Z. Guo, Kirsten Obernier, Sophia Bouhaddou, Elizabeth R. Fischer, Anna Gaulton, Jason C.J. Chang, Bjoern Meyer, Diego Quintero, Julian Knerr, Trupti Patil, Emma J. Manners, Michael C. O’Neal, Monita Muralidharan, Joseph Hiatt, Ajda Rojc, James E. Melnyk, Tanja Kortemme, Benjamin R. tenOever, Thomas Vallet, Rémy Robinot, Cassandra Koh, Benjamin E. Nilsson-Payant, Ruth Hüttenhain, Saker Klippsten, Alicia L. Richards, Eloy Felix, Brian K. Shoichet, Beril Tutuncuoglu, Danielle L. Swaney, Veronica V. Rezelj, Jeffery R. Johnson, Margaret Soucheray, Marisa Goff, R. Dyche Mullins, Kris M. White, Erica Stevenson, Jyoti Batra, Christopher J.P. Mathy, Yuan Zhou, Minkyu Kim, Marco Vignuzzi, Claudia Hernandez-Armenta, Kevan M. Shokat, Julio Saez-Rodriguez, Jacqueline M. Fabius, Timothy McBride, Adolfo García-Sastre, Quang Dinh Tran, Alexandra Hardy, Elena Moreno, Alberto Valdeolivas, Mehdi Bouhaddou, Andrew R. Leach, Melanie Ott, Georg Kochs, Pedro Beltrao, Jiewei Xu, Robyn M. Kaake, Merve Cakir, Ying Shi, Nevan J. Krogan, Lisa Miorin, Danish Memon, David J. Broadhurst, Miguel Correa Marrero, Robert Grosse, Virus et Immunité - Virus and immunity, Institut Pasteur [Paris]-Centre National de la Recherche Scientifique (CNRS), Quantitative Biosciences Institute [UC San Francisco, USA] (QBI), University of California [San Francisco] (UC San Francisco), University of California (UC)-University of California (UC), Gladstone Institutes [San Francisco], European Bioinformatics Institute [Hinxton] (EMBL-EBI), EMBL Heidelberg, Populations virales et Pathogenèse - Viral Populations and Pathogenesis, Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS), Icahn School of Medicine at Mount Sinai [New York] (MSSM), Howard Hughes Medical Institute (HHMI), University of Freiburg [Freiburg], Virus et Immunité - Virus and immunity (CNRS-UMR3569), Universität Heidelberg [Heidelberg] = Heidelberg University, Heidelberg University Hospital [Heidelberg], Zoic Labs [Culver City, CA], Rocky Mountain Laboratories, Vaccine Research Institute [Créteil, France] (VRI), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Centre for Integrative Biological Signalling Studies [Freiburg] (CIBSS), This research was funded by grants from the National Institutes of Health ( P50AI150476 , U19AI135990 , U19AI135972 , R01AI143292 , R01AI120694 , P01A1063302 , and R01AI122747 to N.J.K., 1R01CA221969 and 1R01CA244550 to K.M.S., R01GM133981 to D.L.S., 1F32CA236347-01 to J.E.M., U19AI118610 to J.R.J., and F32CA239333 to M.B.), Defense Advance Research Projects Agency HR0011-19-2-0020 (to N.J.K., A.G.S., and K.M.S.), by the Laboratory for Genomics Research (LGR) Excellence in Research Award (ERA) from the Innovative Genomics Institute at UC Berkeley (grant number 133122P ), by CRIP (Center for Research for Influenza Pathogenesis), a NIAID-supported Center of Excellence for Influenza Research and Surveillance (CEIRS, contract HHSN272201400008C ) (to A.G.S.), by supplements to NIAID grant U19AI135972 and DoD grant W81XWH-19-PRMRP-FPA (to A.G.S.), and by the generous support of the JPB Foundation , the Open Philanthropy Project (research grant 2020-215611 [5384] ), and other philanthropic donations (to A.G.S.), by the Laboratoire d’Excellence 'Integrative Biology of Emerging Infectious Diseases' grant ANR-10-LABX-62-IBEID (to M.V.), by the DFG under Germany's Excellence Strategy ( EXC-2189 , project ID 390939984 to R.G.), by a Starting Grant Award from the European Research Council ( ERC-2014-STG 638884 PhosFunc to P.B.), by the Federal Ministry of Education and Research (BMBF, Computational Life Sciences grant 031L0181B to J.S.R.), by the Intramural Research Program of the NIH, National Institute of Allergy and Infectious Diseases (to E.R.F. and E.D.W.), and by funding from F. Hoffmann-La Roche and Vir Biotechnology and gifts from The Ron Conway Family . K.M.S. is an investigator of the Howard Hughes Medical Institute., ANR-10-LABX-0062,IBEID,Integrative Biology of Emerging Infectious Diseases(2010), European Project: 638884,H2020,ERC-2014-STG,PhosFunc(2015), Universität Heidelberg [Heidelberg], and Vaccine Research Institute (VRI)
- Subjects
Proteomics ,MAPK/ERK pathway ,MESH: Angiotensin-Converting Enzyme 2 ,MESH: Casein Kinase II ,PIKFYVE ,0302 clinical medicine ,MESH: Chlorocebus aethiops ,MESH: Protein Kinase Inhibitors ,MESH: Animals ,Casein Kinase II ,Lung ,0303 health sciences ,Kinase ,MESH: Proteomics ,Phosphoproteomics ,antiviral ,Spike Glycoprotein ,Cyclin-Dependent Kinases ,3. Good health ,MESH: HEK293 Cells ,Spike Glycoprotein, Coronavirus ,Phosphorylation ,Infection ,MESH: Pandemics ,p38 mitogen-activated protein kinases ,Pneumonia, Viral ,MESH: Vero Cells ,p38 ,Antiviral Agents ,General Biochemistry, Genetics and Molecular Biology ,Article ,Betacoronavirus ,03 medical and health sciences ,Biodefense ,Humans ,MESH: SARS-CoV-2 ,MESH: Humans ,MESH: Phosphorylation ,Prevention ,MESH: Host-Pathogen Interactions ,fungi ,Receptor Protein-Tyrosine Kinases ,AXL ,Pneumonia ,Virology ,MAPK ,Coronavirus ,MESH: Peptidyl-Dipeptidase A ,MESH: Pneumonia, Viral ,MESH: Phosphatidylinositol 3-Kinases ,A549 Cells ,Vero cell ,Drug Evaluation ,030217 neurology & neurosurgery ,Developmental Biology ,MESH: Coronavirus Infections ,[SDV]Life Sciences [q-bio] ,viruses ,CDK ,Drug Evaluation, Preclinical ,MESH: Spike Glycoprotein, Coronavirus ,Medical and Health Sciences ,p38 Mitogen-Activated Protein Kinases ,Phosphatidylinositol 3-Kinases ,Chlorocebus aethiops ,MESH: COVID-19 ,Viral ,Phosphoinositide-3 Kinase Inhibitors ,mass spectrometry ,biology ,phosphoproteomics ,Biological Sciences ,Preclinical ,MESH: Cyclin-Dependent Kinases ,Infectious Diseases ,Host-Pathogen Interactions ,MESH: Betacoronavirus ,MESH: Drug Evaluation, Preclinical ,MESH: Receptor Protein-Tyrosine Kinases ,MESH: Caco-2 Cells ,Angiotensin-Converting Enzyme 2 ,Coronavirus Infections ,MESH: Antiviral Agents ,casein kinase II ,Peptidyl-Dipeptidase A ,Vaccine Related ,Cyclin-dependent kinase ,Proto-Oncogene Proteins ,Animals ,Pandemics ,Protein Kinase Inhibitors ,Vero Cells ,MESH: Phosphoinositide-3 Kinase Inhibitors ,030304 developmental biology ,SARS-CoV-2 ,COVID-19 ,Axl Receptor Tyrosine Kinase ,MESH: p38 Mitogen-Activated Protein Kinases ,MESH: Proto-Oncogene Proteins ,Emerging Infectious Diseases ,Good Health and Well Being ,HEK293 Cells ,biology.protein ,MESH: A549 Cells ,Caco-2 Cells - Abstract
Summary The causative agent of the coronavirus disease 2019 (COVID-19) pandemic, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has infected millions and killed hundreds of thousands of people worldwide, highlighting an urgent need to develop antiviral therapies. Here we present a quantitative mass spectrometry-based phosphoproteomics survey of SARS-CoV-2 infection in Vero E6 cells, revealing dramatic rewiring of phosphorylation on host and viral proteins. SARS-CoV-2 infection promoted casein kinase II (CK2) and p38 MAPK activation, production of diverse cytokines, and shutdown of mitotic kinases, resulting in cell cycle arrest. Infection also stimulated a marked induction of CK2-containing filopodial protrusions possessing budding viral particles. Eighty-seven drugs and compounds were identified by mapping global phosphorylation profiles to dysregulated kinases and pathways. We found pharmacologic inhibition of the p38, CK2, CDK, AXL, and PIKFYVE kinases to possess antiviral efficacy, representing potential COVID-19 therapies., Graphical Abstract, Highlights • Phosphoproteomics analysis of SARS-CoV-2-infected cells uncovers signaling rewiring • Infection promotes host p38 MAPK cascade activity and shutdown of mitotic kinases • Infection stimulates CK2-containing filopodial protrusions with budding virus • Kinase activity analysis identifies potent antiviral drugs and compounds, Phosphoproteomics analysis of SARS-CoV-2-infected Vero E6 cells reveals host cellular pathways hijacked by viral infection, leading to the identification of small molecules that target dysregulated pathways and elicit potent antiviral efficacy.
- Published
- 2020
- Full Text
- View/download PDF
5. A SARS-CoV-2 protein interaction map reveals targets for drug repurposing
- Author
-
Pedro Beltrao, Phillip P. Sharp, Nevan J. Krogan, Sabrina J. Fletcher, Saker Klippsten, Trey Ideker, Melanie Ott, Bryan L. Roth, Xi Liu, Devin A. Cavero, Djoshkun Shengjuler, Christopher J.P. Mathy, Jason C.J. Chang, Theodore L. Roth, Hannes Braberg, Claudia Hernandez-Armenta, Lisa Miorin, Jyoti Batra, Shizhong Dai, Maliheh Safari, Brian K. Shoichet, Danish Memon, Tia A. Tummino, Marco Vignuzzi, Mark von Zastrow, Manon Eckhardt, Alan D. Frankel, Qiongyu Li, Tanja Kortemme, Nicole A. Wenzell, Zun Zar Chi Naing, Ferdinand Roesch, Nastaran Sadat Savar, Mathieu Hubert, Xi Ping Huang, Elena Moreno, Danica Galonić Fujimori, Jeffrey Z. Guo, Natalia Jura, Kirsten Obernier, Kliment A. Verba, Harmit S. Malik, Hao-Yuan Wang, Michael McGregor, Melanie J. Bennett, Julia Noack, Gwendolyn M. Jang, Paige Haas, Alice Mac Kain, Daniel J. Saltzberg, Mehdi Bouhaddou, Ziyang Zhang, Yongfeng Liu, Inigo Barrio-Hernandez, Yiming Cai, Kris M. White, Kelsey M. Haas, Maya Modak, Stephanie A. Wankowicz, Raphael Trenker, Kevan M. Shokat, Fatima S. Ugur, Shiming Peng, Sai J. Ganesan, Shaeri Mukherjee, Yuan Zhou, Minkyu Kim, John D. Gross, Jack Taunton, Alicia L. Richards, John S. Chorba, Margaret Soucheray, Danielle L. Swaney, Benjamin J. Polacco, Alan Ashworth, Wenqi Shen, Adolfo García-Sastre, Merve Cakir, Ujjwal Rathore, Kala Bharath Pilla, Michael C. O’Neal, Ying Shi, Kevin Lou, Cassandra Koh, Stephen N. Floor, Davide Ruggero, Ilsa T Kirby, Srivats Venkataramanan, Ruth Hüttenhain, Olivier Schwartz, Beril Tutuncuoglu, Christophe d'Enfert, Jose Liboy-Lugo, David A. Agard, Charles S. Craik, Veronica V. Rezelj, Tina Perica, Matthew P. Jacobson, Lorenzo Calviello, Eric Verdin, Yizhu Lin, Jiankun Lyu, Jiewei Xu, Joseph Hiatt, Andrej Sali, Oren S. Rosenberg, Markus Bohn, David E. Gordon, James S. Fraser, Sara Brin Rosenthal, Duygu Kuzuoğlu-Öztürk, Robyn M. Kaake, Jacqueline M. Fabius, Matthew J. O’Meara, Quang Dinh Tran, Advait Subramanian, Thomas Vallet, Bjoern Meyer, James E. Melnyk, Robert M. Stroud, Helene Foussard, Rakesh Ramachandran, David J. Broadhurst, Janet M. Young, and Michael Emerman
- Subjects
0301 basic medicine ,viruses ,Drug Evaluation, Preclinical ,Plasma protein binding ,Proteomics ,medicine.disease_cause ,Mass Spectrometry ,0302 clinical medicine ,Chlorocebus aethiops ,Protein Interaction Mapping ,Molecular Targeted Therapy ,Protein Interaction Maps ,Cloning, Molecular ,Letter to the Editor ,Coronavirus ,Multidisciplinary ,3. Good health ,Drug repositioning ,030220 oncology & carcinogenesis ,Host-Pathogen Interactions ,Coronavirus Infections ,Protein Binding ,Pneumonia, Viral ,Biology ,Antiviral Agents ,Virus ,Betacoronavirus ,Viral Proteins ,03 medical and health sciences ,Immune system ,Protein Domains ,medicine ,Animals ,Humans ,Receptors, sigma ,Pandemics ,Vero Cells ,SKP Cullin F-Box Protein Ligases ,Innate immune system ,SARS-CoV-2 ,fungi ,HEK 293 cells ,Drug Repositioning ,COVID-19 ,Virology ,Immunity, Innate ,COVID-19 Drug Treatment ,HEK293 Cells ,030104 developmental biology ,Protein Biosynthesis - Abstract
A newly described coronavirus named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is the causative agent of coronavirus disease 2019 (COVID-19), has infected over 2.3 million people, led to the death of more than 160,000 individuals and caused worldwide social and economic disruption1,2. There are no antiviral drugs with proven clinical efficacy for the treatment of COVID-19, nor are there any vaccines that prevent infection with SARS-CoV-2, and efforts to develop drugs and vaccines are hampered by the limited knowledge of the molecular details of how SARS-CoV-2 infects cells. Here we cloned, tagged and expressed 26 of the 29 SARS-CoV-2 proteins in human cells and identified the human proteins that physically associated with each of the SARS-CoV-2 proteins using affinity-purification mass spectrometry, identifying 332 high-confidence protein–protein interactions between SARS-CoV-2 and human proteins. Among these, we identify 66 druggable human proteins or host factors targeted by 69 compounds (of which, 29 drugs are approved by the US Food and Drug Administration, 12 are in clinical trials and 28 are preclinical compounds). We screened a subset of these in multiple viral assays and found two sets of pharmacological agents that displayed antiviral activity: inhibitors of mRNA translation and predicted regulators of the sigma-1 and sigma-2 receptors. Further studies of these host-factor-targeting agents, including their combination with drugs that directly target viral enzymes, could lead to a therapeutic regimen to treat COVID-19. A human–SARS-CoV-2 protein interaction map highlights cellular processes that are hijacked by the virus and that can be targeted by existing drugs, including inhibitors of mRNA translation and predicted regulators of the sigma receptors.
- Published
- 2020
- Full Text
- View/download PDF
6. PRO18 Incidence, Mortality, Hospitalizations, and Expenditures for Pemphigus in Taiwan
- Author
-
L. YuJr, H.Y. Chiu, C.J. Chang, and T.F. Tsai
- Subjects
Pediatrics ,medicine.medical_specialty ,Pemphigus ,business.industry ,Health Policy ,Incidence (epidemiology) ,Economics, Econometrics and Finance (miscellaneous) ,medicine ,business ,medicine.disease ,Pharmacology, Toxicology and Pharmaceutics (miscellaneous) - Published
- 2020
- Full Text
- View/download PDF
7. Effects of home environment on changes in the motor development for typical-development infants and toddlers
- Author
-
Chiu-Yen Chung, C.Y. Liang, Ching-Chang Chen, C.J. Chang, and L.T. Chou
- Subjects
medicine.medical_specialty ,Longitudinal study ,Home environment ,business.industry ,Rehabilitation ,Audiology ,Child development ,Correlation ,Medicine ,Orthopedics and Sports Medicine ,Development infants ,Toddler ,business ,Visual motor integration ,Motor skill - Abstract
Introduction/Background Motor functions are affected by the home environment in childhood. This study aims to identify the home environment factors in the motor development of infants and toddlers. Material and Method This follow-up study had involved 1000 typical-development children, classifying children into infant group (6 months old, n = 500) and toddler group (3 years old, n = 500). Participants were from Kids in Taiwan: National Longitudinal Study of Child Development & Care (KIT). Developmental Motor Screening Scale for Preschool Children (DMSSPC), including body coordination (BC), stability and locomotion (S&L), visual motor integration (VMI), and grasp and manipulation (G&M) domains, was used to assess motor development at baseline and follow up (infants: 6-months follow up and toddlers: 12-months follow up). Home Environment Scale (HES), including parent response (PR), parent participation/learning stimulation (PP/LS), physical environment (PE), child acceptance (CA), speech stimulation (SS), learning material (LM), and environmental diversity (ED), was measured at baseline. Pearson correlation was used to analyze the correlation between HES and DMSSPC at baseline and change scores of DMSSPC (DMSSPC score at follow-up - DMSSPC score at baseline). Results Nearly all HES domains had significantly positive correlations with DMSSPC domains at baseline in infant group. In toddler group, HES domains had significantly positive correlations with DMSSPC domains, except PE with VMI and S&L, and CA with VMI and S&L. Additionally, HES domains except PE and CA had significantly negative correlations with change scores of G&M in infant group. While only PP/LS and ED had significantly negative correlations with change scores of G&M in toddler group. Conclusion A better home environment is associated with greater motor development in most domains. However, a better home environment is linked to lesser changes in G&M development, especially infant groups. These findings may suggest providing a good home environment is important for motor development, especially infant groups.
- Published
- 2018
- Full Text
- View/download PDF
8. PIH5 USING ARTIFICIAL REPRODUCTIVE DATABASE TO ESTABLISH PREDICTED PROBABILISTIC MODEL OF A SUCCESS LIVE BIRTH AFTER IN VITRO FERTILIZATION
- Author
-
Y.L. Chang, L. YuJr, C.J. Chang, and S.C. Chang
- Subjects
In vitro fertilisation ,Health Policy ,medicine.medical_treatment ,Statistics ,Public Health, Environmental and Occupational Health ,medicine ,Statistical model ,Biology ,Live birth - Published
- 2019
- Full Text
- View/download PDF
9. Routing Protocol Performance Evaluation in Wireless Ad hoc Network
- Author
-
K.W. Su, C.J. Chang, M.H. Hsu, An Hunag, Chau-Yang Lai, C.Y. Chen, and C.W. Chen
- Subjects
Zone Routing Protocol ,Dynamic Source Routing ,Optimized Link State Routing Protocol ,Computer science ,Ad hoc On-Demand Distance Vector Routing ,business.industry ,Wireless ad hoc network ,Computer Science (miscellaneous) ,Wireless Routing Protocol ,Mobile ad hoc network ,Ad hoc wireless distribution service ,business ,Computer network - Published
- 2013
- Full Text
- View/download PDF
10. Contribution of Somatic Cell-Associated Activation of Plasminogen to Caseinolysis Within the Goat Mammary Gland
- Author
-
W.K. Chou, W.Y. Chen, M.C. Huang, H.C. Peh, C.J. Chang, M.H. Weng, Hajime Nagahata, and M.T. Chen
- Subjects
medicine.medical_specialty ,Plasmin ,Immunoblotting ,Mammary gland ,Receptors, Cell Surface ,Biology ,Receptors, Urokinase Plasminogen Activator ,Milking ,Plasminogen Activators ,Mammary Glands, Animal ,Internal medicine ,Casein ,Lactation ,Genetics ,medicine ,Animals ,Humans ,Involution (medicine) ,Fibrinolysin ,Urokinase ,Goats ,Antibodies, Monoclonal ,Caseins ,Plasminogen ,Urokinase-Type Plasminogen Activator ,Enzyme Activation ,Milk ,Endocrinology ,medicine.anatomical_structure ,Female ,Animal Science and Zoology ,Plasminogen activator ,Food Science ,medicine.drug - Abstract
Functional regression of the mammary gland is partly reflected by proteolysis of milk protein and tissue protein. The involvement of the plasminogen activation system in degradation of milk protein and mammary tissue damage has been demonstrated under inflammatory conditions. In this study, mammary secretion from 23 dairy goats primarily grouped as lactation (milking twice daily) or involution (milking once daily or less) was used to determine the ratio of gravity-precipitated casein to total milk protein (casein ratio) as an index of caseinolysis, and activities of components of plasminogen activation system as well as their expressions on somatic cells. Based on the casein ratio, lactation goats were subcategorized as very active (71.8 ± 1.0%) or less active (29.9 ± 1.0%) in mammary function; involution goats were subcategorized as gradual (21.7 ± 1.0%) or acute (5.9 ± 0.2%) involution. This result suggests that caseinolysis occurred during regular lactation as well as during involution. On the other hand, activities of components of the plasminogen activation system in mammary secretion were increased along with the decreasing casein ratio, in contrast to the similar activities of their counterparts in circulation throughout various mammary statuses. Correlation analysis between casein ratio and activities of plasminogen activation system of goat milk indicated a significant negative relationship for plasmin (r = −0.64), plasminogen (r = −0.69), and urokinase-type plasminogen activator (uPA; r = −0.78) during involution but not during lactation. As for the cellular components of plasminogen activation system, there was an increase in immunoreactivity on somatic cells toward both monoclonal antibodies of human uPA and human uPA receptor under involution conditions suggesting their upregulation relative to lactation condition. Collectively, these results suggest that plasminogen activation system within the mammary gland differentially contribute to milk caseinolysis along the various stages of goat lactation. Meanwhile, a somatic cell-mediated local elevation of plasmin activity may be committed to extensive caseinolysis during involution.
- Published
- 2006
- Full Text
- View/download PDF
11. Determination of slip rate by optical dating of fluvial deposits from the Wangsan fault, SE Korea
- Author
-
C.B. Im, Chang-Sik Cheong, Jeong-Heon Choi, Ueechan Chwae, K.S. Lee, Andrew S. Murray, J.W. Kim, C.J. Chang, Duk-Geun Hong, and H.W. Chang
- Subjects
Archeology ,Global and Planetary Change ,geography ,geography.geographical_feature_category ,Optically stimulated luminescence ,Pleistocene ,Geochemistry ,Fluvial ,Mineralogy ,Geology ,Fault (geology) ,Quaternary ,Quartz ,Ecology, Evolution, Behavior and Systematics ,Optical dating ,Slip rate - Abstract
The time-integrated slip rate in fault zones can be determined if the deformed deposits are reliably dated. Here, we report optically stimulated luminescence (OSL) ages of Late Pleistocene fluvial deposits cut by the Wangsan fault, southeastern Korea, which displaces a hanging wall block of about 28 m. Five sandy samples of the deformed Quaternary deposits were dated by quartz OSL using the single aliquot regenerative-dose (SAR) protocol. Three samples taken from the footwall block show stratigraphically consistent OSL ages of 54±7, 76±5 and 90±6 ka, from top to bottom. Two samples collected from the same layer in the hanging wall block show reproducible OSL ages of 81±5 and 82±5 ka, which are also in good agreement with the stratigraphic relationships. Our OSL ages yield an average sedimentation rate of the Quaternary deposits as around 0.04 mm a −1 , and a minimum value of time-integrated slip rate as 0.52 mm a −1 . This minimum slip rate is considerably higher than those reported earlier for Quaternary faults in southeastern Korea. The youngest OSL age (54±7 ka) constrains the maximum value of the recurrence interval of the fault movement.
- Published
- 2003
- Full Text
- View/download PDF
12. Tunable VCSEL
- Author
-
C.J. Chang-Hasnain
- Subjects
Electrical and Electronic Engineering ,Atomic and Molecular Physics, and Optics - Published
- 2000
- Full Text
- View/download PDF
13. High-performance liquid chromatogram of steroids in serum of goats during the breeding season
- Author
-
C.J. Chang
- Subjects
Chromatography ,Food Animals ,medicine.medical_treatment ,medicine ,Seasonal breeder ,Animal Science and Zoology ,Serum concentration ,Biology ,Serum samples ,High-performance liquid chromatography ,Testosterone ,Steroid - Abstract
Serum samples from two male and two female goats were analyzed by a high-performance liquid chromatographic method developed for the simultaneous determination of adrenal and gonadal steroid species. The 2 ml serum sample was extracted by a solid-phase column prior to the analysis. A C 18 column was used in separation. The separated species were monitored at 240 nm. The estimated serum concentration of progesterone from chromatograms indicated its increase during pregnancy and decrease following delivery. Testosterone and progesterone were not detected in sera of female and male goats, respectively. A cortisol peak was detectable in all serum samples. This method provides an approach for simultaneously monitoring the patterns of secretion of many steroids.
- Published
- 1997
- Full Text
- View/download PDF
14. Vertical-cavity lasers with an intracavity resonant detector
- Author
-
G.S. Li, S.F. Lim, C.J. Chang-Hasnain, and Wupen Yuen
- Subjects
Physics ,Physics::Instrumentation and Detectors ,business.industry ,Detector ,Physics::Optics ,Photodetector ,Laser ,Noise floor ,Atomic and Molecular Physics, and Optics ,Vertical-cavity surface-emitting laser ,law.invention ,Responsivity ,Optics ,Distributed Bragg reflector laser ,law ,Optoelectronics ,High Energy Physics::Experiment ,Spontaneous emission ,Electrical and Electronic Engineering ,business - Abstract
We demonstrate the first intracavity quantum-well photodetector within an InGaAs DBR QW VCSEL for top- and bottom-emitting structures. Minimal spontaneous emission is detected by the internal detector. Dark current is on the order of picoamperes, limited by our instrument noise floor. The internal detector demonstrates high insensitivity to external ambient light as compared to an external detector. Combining various measurement techniques, we gain an understanding of such an integration and discuss the various ramifications of the issues surrounding the design, fabrication, and performance of these integrated VCSEL-detectors. This configuration facilitates flexible tailoring of the laser efficiency and the integrated detector responsivity.
- Published
- 1997
- Full Text
- View/download PDF
15. In vivo imaging of cortical membrane remodeling in rats with chronic unilateral ablation of nucleus basalis magnocellularis: use of radiolabeled palmitic acid
- Author
-
Enrico De Micheli, Michael C.J. Chang, and Stanley I. Rapoport
- Subjects
General Neuroscience ,Neurology (clinical) ,Molecular Biology ,Developmental Biology - Published
- 1996
- Full Text
- View/download PDF
16. Effects of chronic beta-amyloid treatment on fatty acid incorporation into rat brain
- Author
-
Sheryl K. Brining, Michael C.J. Chang, and Collins R. Jones
- Subjects
Male ,Aging ,medicine.medical_specialty ,Programmed cell death ,Amyloid ,Blotting, Western ,Phospholipid ,Biology ,PC12 Cells ,Rats, Sprague-Dawley ,chemistry.chemical_compound ,In vivo ,Internal medicine ,medicine ,Animals ,Humans ,Beta (finance) ,Brain Chemistry ,Drug Implants ,chemistry.chemical_classification ,Amyloid beta-Peptides ,Cell Death ,General Neuroscience ,Fatty Acids ,Brain ,Fatty acid ,Metabolism ,Lipid Metabolism ,Immunohistochemistry ,Lipids ,In vitro ,Rats ,Endocrinology ,chemistry ,Neurology (clinical) ,Geriatrics and Gerontology ,Developmental Biology - Abstract
The present study evaluated the effects of chronic A beta administration on radio-labeled plasma fatty acid incorporation in rat brain. A beta was chronically infused intraventricularly via an osmotic minipump, for 1 week, at a concentration of 460 microM. After the infusion, fatty acid incorporation was quantified using an in vivo method developed in this laboratory. Three radiolabeled fatty acids were separately infused IV in awake animals. Biochemical analyses of fatty acid incorporation and histology for A beta showed no differences between control (vehicle infusion only) and experimental groups. However, in vitro tests on the cytotoxicity of A beta showed that it caused significant cell death relative to controls (PC-12 cells). The lack of effect of infused A beta on radiolabeled fatty acid incorporation is discussed.
- Published
- 1996
- Full Text
- View/download PDF
17. Pareto optimization of alternative global criterion method for fuzzy structural design
- Author
-
C.J. Chang and C.J. Shih
- Subjects
Mathematical optimization ,Optimization problem ,Degree (graph theory) ,Mechanical Engineering ,Ideal solution ,Fuzzy logic ,Multi-objective optimization ,Computer Science Applications ,Set (abstract data type) ,Modeling and Simulation ,Fuzzy number ,Fuzzy set operations ,General Materials Science ,Civil and Structural Engineering ,Mathematics - Abstract
A max-min variant of the fuzzy λ-formulation strategy, called the alternative global criterion method, the purpose of which is to obtain solutions for multicriteria crisp or fuzzy structural design problems, is presented. This approach goes towards a Pareto optimal set that is equivalent to the min-max variant of the global criterion method. The presented approach is not only capable of acquiring the non-dominated solution, but also capable of achieving the highest design degree of satisfaction. The result shows that a solution with maximum overall satisfaction is not identical to the one which is closest to the ideal solution. The presented methodology is then applied to structural optimization problems involving a vector of conflicting objective functions with crisp or fuzzy constraints.
- Published
- 1995
- Full Text
- View/download PDF
18. Biosynthesis and Secretion of Growth Factor Proteins by Kidney Cells from DES-Treated Syrian Hamsters
- Author
-
George C.J. Chang, Young C. Lin, Robert W. Brueggemeier, and Mustapha A. Beleh
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,Biophysics ,Diethylstilbestrol ,Hamster ,In Vitro Techniques ,Biology ,Kidney ,Biochemistry ,Cricetinae ,Internal medicine ,medicine ,Protein biosynthesis ,Animals ,Electrophoresis, Gel, Two-Dimensional ,Neoplastic transformation ,Isoelectric Point ,Molecular Biology ,Cells, Cultured ,Mesocricetus ,Growth factor ,Cell Biology ,Transforming Growth Factor alpha ,Molecular Weight ,Endocrinology ,medicine.anatomical_structure ,Secretory protein ,Cell culture ,Fibroblast Growth Factor 2 ,medicine.drug - Abstract
Long-term estrogen treatment of Syrian hamsters results in the initiation and development of hormone-dependent renal adenocarcinomas. The pathway(s) to neoplastic transformation remain unknown in this animal model of hormonal carcinogenesis. In the present study, short-term primary kidney cell cultures and incubations of freshly prepared kidney slices have been incubated with [35S]-methionine to study the effects of estrogen treatment on protein biosynthesis in the Syrian hamster. An increase in amount of two secreted proteins were observed with an increasing duration of diethylstilbestrol (DES) treatment. Further characterization of these proteins by two-dimensional electrophoresis identified two proteins present only in treated hamsters, a 20-22 kDa protein and a 16-18 kDa protein with an isoelectric point of 8.5-9.0. Immunoprecipitation using specific antibodies to growth factors, followed by separation on SDS-PAGE electrophoresis, showed that kidney slices from five month-treated animals produced a TGF-α-like protein and a bFGF-like protein. The induction of these growth factors may play an important role in the tumorigenic process in kidneys of Syrian hamsters, including cell proliferation and vascularization of the tumor tissue.
- Published
- 1993
- Full Text
- View/download PDF
19. Changes of mammary vein concentrations of glucose and free fatty acids induced by exogenous insulin and glucose, and relation to mammary gland function in Saanen goats
- Author
-
S.H. Young and C.J. Chang
- Subjects
medicine.medical_specialty ,Insulin ,medicine.medical_treatment ,Mammary gland ,Biology ,Exogenous insulin ,Milk yield ,Endocrinology ,Glucose infusion ,medicine.anatomical_structure ,Food Animals ,Latin square ,Internal medicine ,medicine ,Animal Science and Zoology ,Vein ,Saline - Abstract
Insulin (0.4 IU kg/d) or saline was injected subcutaneously into six goats at 08:00 for 5 days in a double switch-back design in Expt 1. A Latin square design was used in Expt 2 with four treatments, insulin (0.3 IU/kg/d), glucose (50 g/d in 20% solution), insulin plus glucose, or saline, infused intravenously into eight goats at 2-h intervals from 06:00 to 14:00 for 1 day. Milk yield per day/feed consumed was significantly depressed (P 0.05) milk production and average mammary vein glucose concentration. Infusion of glucose with or without insulin depressed average milk fat content (P
- Published
- 1992
- Full Text
- View/download PDF
20. Nutritional requirements of Xylella fastidiosa, which causes Pierce's disease in grapes
- Author
-
C.J. Chang and R.C. Donaldson
- Subjects
Immunology ,Genetics ,General Medicine ,Molecular Biology ,Applied Microbiology and Biotechnology ,Microbiology - Published
- 2000
- Full Text
- View/download PDF
21. Independent phase and magnitude control of an optically carried microwave signal with a three-terminal vertical-cavity surface-emitting laser
- Author
-
S.F. Lim, C.J. Chang-Hasnain, J.A. Hundgings, Kam Y. Lau, and R.J. Stone
- Subjects
Materials science ,business.industry ,Phase (waves) ,Rate equation ,Signal ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Vertical-cavity surface-emitting laser ,law.invention ,Optical pumping ,Optics ,law ,Optoelectronics ,Electrical and Electronic Engineering ,Maser ,business ,Microwave ,Electronic circuit - Abstract
We demonstrate a compact integrated method for phase and magnitude control of an optically carried microwave signal with no external high-frequency circuitry. Our device consists of a novel three contact VCSEL, which permits external control of both the cavity loss and gain. Independent control of the phase and magnitude of the optically carried signal is demonstrated. With reference to the small-signal rate equations, we show that such independent control is only possible given the extra degree of freedom offered by the three contact design.
- Published
- 1999
- Full Text
- View/download PDF
22. A constitutive model for pressure sensitive materials with particular reference to plain concrete
- Author
-
M. Omar Faruque and C.J. Chang
- Subjects
Materials science ,Mechanics of Materials ,business.industry ,Mechanical Engineering ,Pressure sensitive ,Constitutive equation ,General Materials Science ,Structural engineering ,business ,Test data - Abstract
A constitutive model is presented to describe stress-strain responses of a class of pressure sensitive materials. An important feature of this model is that the failure surface and the yield cap are both described by the same list of material parameters. In addition, the model effectively characterizes the variation of strengths along compression and extension paths. The number of material parameters is kept to a minimum and can be determined using conventional test data.
- Published
- 1990
- Full Text
- View/download PDF
23. Spatial mode structure of index-guided broad-area quantum-well lasers
- Author
-
E. Colas, C.J. Chang-Hasnain, and Eli Kapon
- Subjects
Materials science ,business.industry ,Physics::Optics ,Heterojunction ,Injection seeder ,Condensed Matter Physics ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Semiconductor laser theory ,Optics ,law ,Optoelectronics ,Electrical and Electronic Engineering ,business ,Waveguide ,Refractive index ,Quantum well ,Tunable laser - Abstract
The spatial mode characteristics of index-guided ridge-waveguide broad-area (BA) quantum-well lasers grown by organometallic chemical vapor deposition were investigated experimentally. The index-guided BA lasers lase in a high-order lateral mode, and thus emit a double-lobed far-field pattern. This is significantly different from their gain-guided counterparts, which lase in the fundamental mode. For BA lasers with the same width and made on the same or similar material, the index-guided lasers have lower threshold currents, higher quantum efficiencies, and better linearity in the light versus current characteristics. It is observed that the order of the dominant high-order lateral-mode increased with increasing laser width or effective index step of the laser waveguide. In addition, it is found that the mechanism for degradation in the spatial coherence at high pumping levels is the onset of higher order lateral modes. >
- Published
- 1990
- Full Text
- View/download PDF
24. Modal analysis of nonlinear systems with classical and non-classical damping
- Author
-
B. Mohraz and C.J. Chang
- Subjects
Differential equation ,Mechanical Engineering ,Modal analysis ,Equations of motion ,Structural dynamics ,Computer Science Applications ,Nonlinear system ,Modal ,Control theory ,Modeling and Simulation ,Fictitious force ,General Materials Science ,Reduction (mathematics) ,Civil and Structural Engineering ,Mathematics - Abstract
In the dynamic analysis and design of structures and equipment, the behavior of various components beyond the linear range is often of interest. A nonlinear vibration analysis is time consuming, particularly if many configurations or loading conditions have to be considered in order to arrive at representative values for design. The selection of an efficient and yet accurate analysis procedure is therefore extremely important. Two mode-superposition procedures are presented for the dynamic analysis of nonlinear structures with classical (proportional) and non-classical (non-proportional) damping. The nonlinearity at each time step is treated as a pseudo force. Undamped eigensolution and complex modes are used to uncouple the equations of motion for classical and non-classical damping cases. A recursive procedure based on the exact solution of the differential equation is used to obtain the modal responses. The advantages of the proposed method of computing the response over the existing integration techniques are: (a) the simplicity of the procedure, (b) a substantial reduction in computational time, (c) the possibility of using fewer modes to achieve the desired accuracy, and (d) the adaptability of the procedure to parallel processing machines which will further reduce the computational time.
- Published
- 1990
- Full Text
- View/download PDF
25. Profile of gelatinolytic capacity of raw goat milk and the implications for milk quality
- Author
-
M.T. Chen, W.B. Liu, C.J. Chang, M.C. Huang, W.Y. Chen, T.C. Yu, M.H. Weng, Shuen-Ei Chen, Hajime Nagahata, and H.C. Peh
- Subjects
Involution (mathematics) ,Time Factors ,Gelatinase A ,Cell Count ,Biology ,fluids and secretions ,Casein ,Lactation ,Genetics ,medicine ,Gelatinase ,Animals ,Humans ,Food science ,Fibrinolysin ,Fibrin ,Goats ,food and beverages ,Caseins ,Reproducibility of Results ,Raw milk ,medicine.disease ,Milk Proteins ,Mastitis ,medicine.anatomical_structure ,Milk ,Gelatinases ,Gelatin ,Animal Science and Zoology ,Female ,Somatic cell count ,Food Science ,Peptide Hydrolases - Abstract
Both endogenous and exogenous proteinases occur in milk, and they can have beneficial or detrimental effects on dairy production. Because the lactation length of dairy goats is shorter and the somatic cell count (SCC) of goat milk is generally greater compared with dairy cows, the objectives of the present study were to investigate the prevalence of major proteinases in raw goat milk, their association with SCC and production stage, and their effects on milk quality. Milk samples were collected from individual goats in consecutive weeks for different durations, covering regular lactation, late lactation, and post-milk stasis. Long-term (monthly) or short-term (weekly) fluctuations of milk fibrinolytic and gelatinolytic capacities of individual goats were revealed chronologically on fibrin and gelatin zymograms, respectively. In a separate trial involving milk samples from 23 goats at random production stages, the percentage of ultracentrifuge force-precipitable casein of total milk protein was calculated to represent milk quality and was assessed to evaluate its correlation with the corresponding proteolytic capacities. The results for regular milk indicate that gelatinase B was more abundant than gelatinase A when they first appeared at SCC of approximately 1 x 10(6)/mL. During the last month before milk stasis, both gelatinases A and B were found to be prevalent and prominent in milk regardless of the broad SCC range recorded there. Fibrinolytic activity and the active form of gelatinase A were only regularly detected in post-stasis secretions and were scarce before stasis. The results of the milk quality trial indicate that milk of relatively high proteinase capacity tended to have a low casein ratio. Correlation analysis confirmed a significant relationship between gelatinase capacity of goat milk and production stage, SCC, or casein ratio. It is suggested that an elevation of gelatinolytic capacity of goat milk coincides with an increase in somatic cell number accompanying the extension of lactation length, which is unfavorable for the production of a more desirable quality of goat milk.
- Published
- 2007
26. 28 FUNCTIONAL DISSECTION OF DEL(7Q)-MDS WITH PATIENT-DERIVED INDUCED PLURIPOTENT STEM CELLS
- Author
-
C.J. Chang, Timothy A. Graubert, A.G. Kotini, E. Papapetrou, and Stephen D. Nimer
- Subjects
Cancer Research ,Oncology ,business.industry ,medicine ,Cancer research ,Hematology ,Dissection (medical) ,medicine.disease ,business ,Induced pluripotent stem cell - Published
- 2015
- Full Text
- View/download PDF
27. Experimental demonstration of a multihop shuffle network using WDM multiple-plane optical interconnection with VCSEL and MQW/DBR detector arrays
- Author
-
Alan E. Willner, J.E. Leight, G. Giaretta, C. Kim, C.J. Chang-Hasuain, W. Yuen, and J. Yoo
- Subjects
Computer science ,Plane (geometry) ,Detector ,Multistage interconnection networks ,Physics::Optics ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Vertical-cavity surface-emitting laser ,law.invention ,Distributed Bragg reflector laser ,law ,Relay ,Wavelength-division multiplexing ,Computer Science::Networking and Internet Architecture ,Electronic engineering ,Electrical and Electronic Engineering ,Computer Science::Information Theory - Abstract
A two-stage multihop shuffle network is experimentally demonstrated. The system is implemented using two-dimensional multiple-plane wavelength-division-multiplexed (WDM) optical interconnections consisting of an integrated multiple-wavelength WDM transmitting vertical-cavity surface-emitting laser arrays and three wavelength-selective detector arrays. Two-hop data relay of the two-state shuffle network multihop is performed at 622 and 155 Mb/s for a two-wavelength and a three-wavelength fanout, respectively.
- Published
- 1998
- Full Text
- View/download PDF
28. Magnetic and transport properties of Py/Cr/Co/Cr sputtered films
- Author
-
Y.D. Yao, C.J. Chang, Y. Liou, Chi-Kuen Lo, Ivo Klik, and C.H. Ho
- Subjects
Materials science ,Kerr effect ,Condensed matter physics ,Film plane ,Computer Science::Software Engineering ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Magnetic hysteresis ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Materials Science ,Magnetization ,Magnetic anisotropy ,Hysteresis ,Hall effect ,Electrical and Electronic Engineering ,Anisotropy - Abstract
Py/sub 150 /spl Aring///Cr/sub 70 /spl Aring///Co/sub 200 /spl Aring///Cr/sub 150 /spl Aring// sputtered films deposited on glass were studied by means of magneto-optical Kerr effect and planar Hall effect. The properties of these films are dominated by the Co layer which exhibits not only uniaxial in-plane anisotropy but, also a very hard magnetization component which is canted out of the film plane. A striking feature of tie angular dependence of hysteresis loops is the apparent loss of two-fold symmetry. Due to the out of plane magnetization, the Hall voltage signal comprises not only the planar Hall but also the ordinary and extraordinary Hall effect signals.
- Published
- 1997
- Full Text
- View/download PDF
29. Tutorial on Components for Next-Generation High-Speed LAN
- Author
-
C.J. Chang-Hasnain
- Subjects
Optical fiber ,Transmission (telecommunications) ,business.industry ,law ,Computer science ,Communication bandwidth ,The Internet ,business ,Telecommunications ,Interconnectivity ,law.invention ,Computer network - Abstract
Summary form only given. Triggered by the ever-increasing computer speed and the wide application of the Internet, the demand for higher communication bandwidth and interconnectivity is drastically increasing. Networking a group of (computers in proximity to form LAN has become imperative for corporations and organizations to compete and perform.
- Published
- 2005
- Full Text
- View/download PDF
30. A novel simple oxide isolation process to fabricate high performance VCSEL arrays
- Author
-
L. Aronson, B. Lemoff, C.J. Chang-Hasnain, G. Giaretta, and W. Yuen
- Subjects
Optical amplifier ,Materials science ,business.industry ,Oxide ,Process (computing) ,Vertical-cavity surface-emitting laser ,chemistry.chemical_compound ,chemistry ,Optoelectronics ,Semiconductor optical gain ,Isolation (database systems) ,business ,Optical arrays ,Tunable laser - Published
- 2005
- Full Text
- View/download PDF
31. Magnetic and Transport Properties of Py/Cr/Co/Cr Sputtered Films
- Author
-
C.K. Lo, I. Klik, Y. Liou, C.J. Chang, and Y.D. Yao
- Published
- 2005
- Full Text
- View/download PDF
32. Pose control ofmobile manipulators with an uncalibrated eye-in-hand vision system
- Author
-
C.J. Chang and T. I. Tsay
- Subjects
Engineering ,business.industry ,Mobile manipulator ,Orientation (computer vision) ,Machine vision ,GRASP ,Mobile robot ,Robot end effector ,law.invention ,law ,Computer vision ,Cartesian coordinate system ,Artificial intelligence ,Motion planning ,business - Abstract
Mobile manipulators, which consist of a mobile base and a robot manipulator equipped with a vision system, are appropriate for transferring small quantities of a range of different materials in production lines. Position and orientation errors of the mobile base relative to the station are inevitably caused by the non-horizontality of the ground and positioning errors of the mobile base. Hence, this study utilises an uncalibrated eye-in-hand vision system to provide visual information for controlling the manipulator mounted on the mobile base, to pick up a workpiece located on the station. A vision-guided control strategy is proposed. It is based on selected image features and an image-based look-and-move control structure. The control law employed in the control structure is based mainly on the off-line estimate of the transformation from feature space to Cartesian space using the least squares estimation algorithm. Finally, the positioning performance of the eye-in-hand manipulator is experimentally evaluated by controlling the end-effector of the manipulator to approach and grasp the workpiece in various locations on a station.
- Published
- 2005
- Full Text
- View/download PDF
33. Reduction of superficial thermal injury using cryogen cooling during laser-assisted cartilage reshaping of composite cartilage grafts; preliminary investigation
- Author
-
K.L. Tsang, L.L. Chiu, C.J. Chang, and B.J.F. Wong
- Subjects
Auricle ,medicine.anatomical_structure ,Materials science ,Thermal injury ,medicine.medical_treatment ,Cartilage ,Concave surface ,Composite number ,medicine ,Perichondrium ,Laser assisted ,Reduction (orthopedic surgery) ,Biomedical engineering - Abstract
The lop ear deformity can treated with laser-assisted reshaping of cartilage. But thermal injury is a problem. In this situation, cryogen spray cooling (CSC) plays an important role in drawing heat from skin when laser heating. Composite cartilage grafts were excised from New Zealand rabbit ears. An incision through the perichondrium exposed a 5mm wide strip of cartilage on the posterior auricle surface. Flat specimens were manually deformed with a jig and maintained in this new position during irradiation. The exposed cartilage was irradiated on the concave surface with an Nd:YAG laser (1064 nm, 3 mm spot) at 10W, 15W, 20W. Cryogen spray cooling (CSC) was applied to the convex, nonirradiated side of the tissue to reduce thermal injury to the graft. The specimens were maintained in a deformation for 15 minutes after irradiation and serially examined for 14 days. It is concluded that higher dosimetry makes more reshaping and more superficial epidermal injury. More cryogen spray cooling makes more protection against superficial epidermal injury and less cartilage reshaping.
- Published
- 2004
- Full Text
- View/download PDF
34. Fault detection and classification of plasma CVD tool
- Author
-
H.C. Wu, C.J. Chang, J.C. Ko, C.Y. Lee, B.H. Chen, M.S. Zhou, M.S. Liang, and C.T. Chang
- Subjects
business.industry ,Computer science ,Analytical chemistry ,Plasma ,Process engineering ,business ,Fault detection and isolation - Published
- 2004
- Full Text
- View/download PDF
35. A novel method to prevent the galvanic effect by the N/sub 2/ gas purging in the Ti/TiN sputter process
- Author
-
C.P. Chung, C.J. Chang, C.Y. Wang, C.N. Chou, T.S. Lin, C.S. Jou, and W.T. Lin
- Subjects
Materials science ,Surface stress ,Metallurgy ,chemistry.chemical_element ,Galvanization ,symbols.namesake ,chemistry ,Sputtering ,Galvanic cell ,symbols ,Thin film ,Tin ,Layer (electronics) ,Titanium - Abstract
Ti/TiN film is usually sputtered on the AlCu surface as anti-reflection layer. In our case, we find that weaker TiN is formed because of the temperature difference between Ti/TiN and AlCu surfaces during subsequent sputtering process. The coming out surface stress by the temperature difference induces weaker TiN in some specified topography and generates the galvanic effect after processing in subsequent developer solution (alkaline-like). In order to avoid the surface stress, cooling down the surface temperature of AlCu before depositing the Ti/TiN layers with the N/sub 2/ gas purging is found to be an effective way for the suppression of galvanic phenomena.
- Published
- 2004
- Full Text
- View/download PDF
36. Analog modulation dypamic range enhancement using injection-locked 1.55 μm VCSELs
- Author
-
C.J. Chang-Hasnain, L. Chrostowski, and C.-H. Chang
- Subjects
Materials science ,Spurious-free dynamic range ,Optics ,business.industry ,Relative intensity noise ,Dynamic range ,Phase noise ,Quantum noise ,Optoelectronics ,Radio frequency ,business ,Noise figure ,Low-noise amplifier - Published
- 2003
- Full Text
- View/download PDF
37. Tilt loss in wavelength tunable micromechanical vertical cavity lasers
- Author
-
C.J. Chang-Hasnain and M.Y. Li
- Subjects
Cantilever ,Materials science ,business.industry ,Physics::Optics ,Laser ,Distributed Bragg reflector ,law.invention ,Vertical-cavity surface-emitting laser ,Wavelength ,Nonlinear Sciences::Adaptation and Self-Organizing Systems ,Tilt (optics) ,Optics ,Distributed Bragg reflector laser ,law ,Wavelength-division multiplexing ,Optoelectronics ,business - Abstract
Summary form only given. Wavelength tunable vertical cavity surface emitting lasers (VCSELs) have many applications in compact instrumentation and WDM communications. 31.6 nm of continuous tuning has been demonstrated by a micromechanical tunable VCSEL with a movable cantilever. Because the VCSEL's top mirror is embedded into this movable cantilever, tilt is introduced to this top distributed Bragg reflector (DBR) as the lasing wavelength is tuned. A frequently asked question is the effect of this tilted DBR on the optical mode in such a VCSEL structure. In the paper, we address this question with a numerical approach and show that for devices with diameters of 5 /spl mu/m or less, tilt loss does not dominate modal optical loss in our tunable structure.
- Published
- 2003
- Full Text
- View/download PDF
38. Effect of process control in oxide-confined top-emitting lasers
- Author
-
Wupen Yuen, G.S. Li, M.Y. Li, and C.J. Chang-Hasnain
- Subjects
Materials science ,business.industry ,Oxide ,Single-mode optical fiber ,Injection seeder ,Transverse mode ,Gallium arsenide ,Condensed Matter::Materials Science ,chemistry.chemical_compound ,Nonlinear Sciences::Adaptation and Self-Organizing Systems ,Optics ,chemistry ,Quantum dot laser ,Optoelectronics ,business ,Quantum well ,Tunable laser - Abstract
Summary form only given. Transverse mode as a function of aperture size is studied. Stringent oxidation accuracy to within a fraction of 1 /spl mu/m is required to render high yield, single mode, oxide confined GaAs QW VCSELs.
- Published
- 2002
- Full Text
- View/download PDF
39. Reduced thermal cross-talk in angled etched facet individually addressable laser arrays
- Author
-
Daniel Francis and C.J. Chang-Hasnain
- Subjects
Facet (geometry) ,Materials science ,business.industry ,Physics::Optics ,Material system ,Laser ,Gallium arsenide ,law.invention ,chemistry.chemical_compound ,Optics ,chemistry ,law ,Etching (microfabrication) ,Thermal ,Optoelectronics ,Physics::Atomic Physics ,business ,Tunable laser ,Quantum well - Abstract
We have fabricated closely spaced (8 /spl mu/m) arrays of non parallel etched facet lasers. We compared the thermal cross-talk of angled lasers with that of parallel stripe lasers with same separation. The angled lasers show less than half the thermal coupling of parallel lasers. Lasers are demonstrated in two different material systems. In InGaAs these lasers produced up to 120 mW/facet with an efficiency of .24 W/A per facet.
- Published
- 2002
- Full Text
- View/download PDF
40. Polarization induced enhancement of relative intensity noise and modulation distortion in vertical cavity surface emitting lasers
- Author
-
M.S. Wu, L.A. Buckman, G.S. Li, K.Y. Lau, and C.J. Chang-Hasnain
- Published
- 2002
- Full Text
- View/download PDF
41. Nonlinear optical properties and poling dynamics of a side-chain polyimide/disperse-red dye film: in situ optical second-harmonic generation study
- Author
-
Wha-Tzong Whang, C.J. Chang, C.L. Liao, and J.Y. Huang
- Subjects
chemistry.chemical_classification ,Materials science ,business.industry ,Poling ,Second-harmonic generation ,Photorefractive effect ,Polymer ,chemistry ,Electric field ,Side chain ,Optoelectronics ,Thermal stability ,business ,Polyimide - Abstract
Nonlinear optical (NLO) polymers are advantageous over inorganic crystalline materials in several aspects and have found interesting applications such as modulators, switches, and more recently as photorefractive devices. However, the second-order NLO response of the materials, which is created by an electric poling process, decays as time lapses. For the use of an electrooptic device, it is highly desirable to keep the NLO response in an infinitely long period. But for the photorefractive applications, a fast response of the orientational distribution of NLO molecules to an electric field is more important. For both cases, the orientational distribution and its response to an electric field convey valuable information of the polymeric materials. In this report, the authors show that probing the orientational distribution of NLO molecules during the poling process provides insight of the thermal stability of the NLO response and the underlying interaction between the polymer and NLO molecules. >
- Published
- 2002
- Full Text
- View/download PDF
42. Optimization of VCSEL with an integrated resonant photodetector
- Author
-
K.M. Lascola, Wupen Yuen, C.J. Chang-Hasnain, and S.F. Lim
- Subjects
Materials science ,Physics::Instrumentation and Detectors ,business.industry ,Physics::Optics ,Photodetector ,Edge (geometry) ,Vertical-cavity surface-emitting laser ,Wavelength ,Optics ,Quantum dot laser ,Optoelectronics ,business ,Tunable laser ,Quantum well - Abstract
We show that the intracavity detector-VCSEL performance depends critically on the relative alignment of the Fabry-Perot wavelength and the quantum-well absorber band edge. By strategic design, we obtain well-matched behavior of the internal and external detectors-up to 5 times threshold. Comprehensive modeling agrees with experimental results.
- Published
- 2002
- Full Text
- View/download PDF
43. Multiple-wavelength VCSEL arrays on patterned substrates
- Author
-
C.J. Chang-Hasnain, Wupen Yuen, and G.S. Li
- Subjects
Wavelength ,Materials science ,Optics ,Distributed Bragg reflector laser ,business.industry ,Lasing wavelength ,Optoelectronics ,business ,Lambda ,Distributed Bragg reflector ,Patterned substrate ,Tunable laser ,Vertical-cavity surface-emitting laser - Abstract
The lasing wavelength of a VCSEL is primarily determined by the effective cavity thickness which can be varied by changing the thickness of the /spl lambda/-spacer or the DBR layers. There have been many efforts in making MW-VCSEL arrays, where different methods of varying the effective cavity thickness were explored. Among all these methods, patterned-substrate MBE growth presents a very attractive approach since only a single growth is necessary and wide and accurate wavelength spans can be achieved with in-situ monitoring. In this paper, we review two patterned substrate methods. Both lead to simultaneous achievements of wide /spl lambda/ spacing, high yield and high performance. The comparison between the two methods is discussed.
- Published
- 2002
- Full Text
- View/download PDF
44. Structural dependence of the thermal resistance of vertical cavity surface emitting lasers
- Author
-
C.J. Chang-Hasnain, W. Yuen, and K.M. Lascola
- Subjects
Materials science ,business.industry ,Thermal resistance ,Physics::Optics ,Laser ,Distributed Bragg reflector ,law.invention ,Vertical-cavity surface-emitting laser ,Nonlinear Sciences::Adaptation and Self-Organizing Systems ,Optics ,Distributed Bragg reflector laser ,law ,Thermal ,Optoelectronics ,business ,Quantum well ,Tunable laser - Abstract
Thermal effects are well known to limit peak output power and efficiency of vertical cavity surface emitting lasers (VCSELs). However, they are often disregarded in VCSEL design. In this work, using a simple thermal model, we consider the effect of device structure (both geometry and layer composition) on the thermal properties of VCSELs and verify the validity of the model by comparing with experimental results.
- Published
- 2002
- Full Text
- View/download PDF
45. Electrically-pumped directly-modulated tunable VCSEL for metro DWDM applications
- Author
-
D. Davis, G.S. Li, C.J. Chang-Hasnain, W. Yuen, M. Jansen, and R.F. Nabiev
- Subjects
Microelectromechanical systems ,Cantilever ,Materials science ,business.industry ,Laser ,law.invention ,Vertical-cavity surface-emitting laser ,Semiconductor laser theory ,Optical pumping ,Wavelength ,Optics ,Distributed Bragg reflector laser ,law ,Wavelength-division multiplexing ,Laser mode locking ,Optoelectronics ,business ,Voltage - Abstract
Vertical cavity surface emitting lasers (VCSELs) offer advantages of being very cost effective and mass manufacturable. By integrating a VCSEL with a micro-electro-mechanical system (MEMS) cantilever, a tunable VCSEL with wide and continuous wavelength tuning can be obtained. Previous demonstrations of this concept were achieved in the short-wavelength (900-980 nm) regime. In this paper, we report the first electrically pumped tunable VCSELs with continuous tuning in 1530-1620 nm wavelength regime. The VCSELs are directly modulated at 2.5 Gbps (OC-48) rates and show error-free transmissions. Wavelength locking to ITU-grids are accomplished in /spl sim/200 /spl mu/s.
- Published
- 2002
- Full Text
- View/download PDF
46. 1.5-1.6 μm VCSEL for metro WDM applications
- Author
-
C.J. Chang-Hasnain
- Subjects
chemistry.chemical_compound ,Wavelength ,Optics ,Materials science ,chemistry ,business.industry ,Wavelength-division multiplexing ,Optoelectronics ,business ,Tunable laser ,Gallium arsenide ,Vertical-cavity surface-emitting laser - Abstract
The performance of an electrically pumped, continuously tunable, single-epitaxy VCSEL emitting in the 1530-1620 nm wavelength regime is reported. The VCSELs exhibit a continuous, repeatable and hysteresis-free wavelength-tuning characteristic. Further, the VCSELs are directly modulated at 2.5 Gbps and have >45 dB side mode suppression ratio (SMSR) over the entire tuning range. The performance of such VCSELs make them highly promising for reconfigurable WDM metropolitan area networks.
- Published
- 2002
- Full Text
- View/download PDF
47. GPS Application on Huge Construction Project- A Feasibility Investigation for Taipei MRT Long-Term Network
- Author
-
Martin W. Pei, P.Y. Chang, and C.J. Chang
- Subjects
Transport engineering ,Engineering ,business.industry ,Global Positioning System ,business ,Term (time) - Published
- 2000
- Full Text
- View/download PDF
48. Comparative study of the analog performance of a vertical-cavity surface-emitting laser under gain and cavity loss modulation
- Author
-
J.A. Hudgings, R.J. Stone, S.F. Lim, K.Y. Lau, and C.J. Chang-Hasnain
- Subjects
Materials science ,Spurious-free dynamic range ,Optics ,Analog transmission ,Modulation ,business.industry ,Dynamic range ,Optoelectronics ,business ,High dynamic range ,Intermodulation ,Semiconductor laser theory ,Vertical-cavity surface-emitting laser - Abstract
Summary form only given.Analog applications of VCSELs require highly linear wideband operation, minimal intermodulation distortion, and high dynamic range. The maximum spur-free dynamic range (SFDR) obtained for a VCSEL is 104.3 dB Hz/sup 2/3/ at 102 MHz; error-free analog transmission over 3 km of fiber has been demonstrated at 1 GHz. This work suggests that, with future design improvements, VCSELs may be able to compete with DFB lasers for analog applications. The device used in this study is a VCSEL with an independently biased, voltage-controlled, intracavity absorber.
- Published
- 2000
- Full Text
- View/download PDF
49. High-performance 1.6/spl mu/m single-epitaxy top-emitting VCSEL
- Author
-
W. Yuen, G.S. Li, R.F. Nabiev, J. Boucart, H. Kner, R. Stone, D. Zhang, M. Beaudoin, T. Zheng, C. He, K. Yu, M. Jansen, D.P. Worland, and C.J. Chang-Hasnain
- Subjects
Optical amplifier ,Materials science ,Optics ,business.industry ,law ,Optoelectronics ,Optical modulation amplitude ,business ,Epitaxy ,Optical microcavity ,Waveguide (optics) ,Vertical-cavity surface-emitting laser ,law.invention - Published
- 2000
- Full Text
- View/download PDF
50. N-arachidonylethanolamine (anandamide) formation from N-arachidonylphosphatidylethanolamine in rat brain membranes
- Author
-
Toru Sasaki and Michael C.J. Chang
- Subjects
Cerebral Cortex ,Male ,Stereochemistry ,Polyunsaturated Alkamides ,Phosphatidylethanolamines ,Cell Membrane ,General Medicine ,Anandamide ,Arachidonic Acids ,Rat brain ,Endocannabinoid system ,General Biochemistry, Genetics and Molecular Biology ,Rats, Inbred F344 ,Rats ,chemistry.chemical_compound ,Membrane ,chemistry ,Biochemistry ,Sulfhydryl reagent ,Animals ,Arachidonic acid ,General Pharmacology, Toxicology and Pharmaceutics ,PMSF ,Phenylmethylsulfonyl Fluoride ,Endocannabinoids - Abstract
Labeled L-N-arachidonylphosphatidylethanolamine (L-N-arachidonyl PE), a likely precursor of N-arachidonylethanolamine (anandamide), as well as its D-isomer, were synthesized using [14C]arachidonic acid. Anandamide was formed by incubating L-N-arachidonyl PE and rat brain membrane with phenylmethylsulfonyl fluoride (PMSF), an inhibitor of anandamide amidohydrolase. Formation of anandamide from L-N-arachidonyl PE was inhibited by p-chloromercuriphenylsulfonic acid (p-CMPS), sulfhydryl reagent, and heat inactivate pre-treatment. D-N-Arachidonyl PE, an unnatural analog for N-arachidonyl PE, did not form anandamide.
- Published
- 1997
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.