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1,369 results on '"Chae, Y."'

152. Present status and recent results from the APS SASE FEL

Author

Lewellen, J.W., Milton, S.V., Gluskin, E., Arnold, N.D., Benson, C., Berg, W., Biedron, S.G., Borland, M., Chae, Y.-C., Dejus, R.J., Hartog, P.K.Den, Deriy, B., Erdmann, M., Eidelman, Y.I., Hahne, M.W., Huang, Z., Kim, K.-J., Li, Y., Lumpkin, A.H., Makarov, O., Moog, E.R., Nassiri, A., Sajaev, V., Soliday, R., Tieman, B.J., Trakhtenberg, E.M., Vasserman, I.B., Vinokurov, N.A., Wiemerslage, G., and Yang, B.X.

Published
2002
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156. The Levodopa Response Trial and the Parkinson Disease Digital Biomarker Challenge: Monitoring symptoms of Parkinson’s disease in the lab and home using wearable sensors

Author

Daneault, J., Vergara-Diaz, G., Costante, G., Fabara, E., Ferreira- Carvalho, G., Golabchi, F., Parisi, F., Sapienza, S., Chae, Y., Snyder, P., Aubin, P., Banda, Peter, Brunner, D., Dorsey, R., Mangravite, L., Marks, W., Neto, E., Rubin, U., Soderberg, E., Daeschler, D., Moore, S., Sieberts, S., Omberg, L., Bonato, P., Daneault, J., Vergara-Diaz, G., Costante, G., Fabara, E., Ferreira- Carvalho, G., Golabchi, F., Parisi, F., Sapienza, S., Chae, Y., Snyder, P., Aubin, P., Banda, Peter, Brunner, D., Dorsey, R., Mangravite, L., Marks, W., Neto, E., Rubin, U., Soderberg, E., Daeschler, D., Moore, S., Sieberts, S., Omberg, L., and Bonato, P.

Abstract

Objective: To leverage a community of researchers and shared wearable data to develop algorithms to estimate the severity of PD specific symptoms. Background: People with Parkinson’s disease (PwPD) often experience fluctuations in motor symptom severity. Wearable sensors have the potential to help clinicians monitor symptoms over time, outside the clinic. However, to gather accurate and clinically-relevant measures, there is a need to develop robust algorithms based on clinically- labelled data. Methods: The Levodopa Response Trial captured three-axis acceleration from two wrist-worn sensors and a smartphone located at the waist from 29 PwPD continuously over 4 days. On day 1, in an in-clinic visit, participants performed clinical assessments and motor tasks on their regular medication regimen. During these visits, a clinician also provided symptom severity scores for tremor, bradykinesia, and dyskinesia. On days 2 & 3, sensor data was collected while participants were at home. On day 4, participants returned to the clinic for the same assessments as day 1, but arrived without having taken their medication for at least 10 hours. Leveraging this dataset, Sage Bionetworks, the Michael J Fox Foundation and the Robert Wood Johnson Foundation launched the PD Digital Biomarker DREAM Challenge which made a subset of the data available to researchers to develop robust and accurate algorithms for the estimation of specific symptoms’ severity. Results: Teams participating in the challenge used several technical approaches, from signal processing to deep learning. 35 submissions were received for the estimation of action tremor severity. Teams achieved an area under the precision-recall curve (AUPR) of 0.444 to 0.75. As for dyskinesia during movement, 37 submissions were received and the teams achieved an AUPR of 0.175 to 0.477. Finally, 39 submissions were received for the estimation of bradykinesia and the teams achieved an AUPR of 0.413 to 0.95. Null expectations for the te

Published
2018

157. Does different information disclosure on placebo control affect blinding and trial outcomes? A case study of participant information leaflets of randomized placebo-controlled trials of acupuncture

Author

Cheon, S, Park, HJ, Chae, Y, Lee, H, Cheon, S, Park, HJ, Chae, Y, and Lee, H

Abstract

© 2018 The Author(s). Background: While full disclosure of information on placebo control in participant information leaflets (PILs) in a clinical trial is ethically required during informed consent, there have been concerning voices such complete disclosures may increase unnecessary nocebo responses, breach double-blind designs, and/or affect direction of trial outcomes. Taking an example of acupuncture studies, we aimed to examine what participants are told about placebo controls in randomized, placebo-controlled trials, and how it may affect blinding and trial outcomes. Methods: Authors of published randomized, placebo-controlled trials of acupuncture were identified from PubMed search and invited to provide PILs for their trials. The collected PILs were subjected to content analysis and categorized based on degree of information disclosure on placebo. Blinding index (BI) as a chance-corrected measurement of blinding was calculated and its association with different information disclosure was examined. The impact of different information disclosure from PILs on primary outcomes was estimated using a random effects model. Results: In 65 collected PILs, approximately 57% of trials fully informed the participants of placebo control, i.e. full disclosure, while the rest gave deceitful or no information on placebo, i.e. no disclosure. Placebo groups in the studies with no disclosure tended to make more opposite guesses on the type of received intervention than those with disclosure, which may reflect wishful thinking (BI -0.21 vs. -0.16; p = 0.38). In outcome analysis, studies with no disclosure significantly favored acupuncture than those with full disclosure (standardized mean difference - 0.43 vs. -0.12; p = 0.03), probably due to enhanced expectations. Conclusions: How participants are told about placebos can be another potential factor that may influence participant blinding and study outcomes by possibly modulating patient expectation. As we have few empirical f

Published
2018

158. Algorithms for partitioning a graph

Author

Park, Taehoon and Lee, Chae Y.

Subjects
Graph theory -- Research, Partitions (Mathematics) -- Research, Algorithms -- Research
Abstract

The k-way graph partitioning problem is considered with two efficient heuristic procedures. Algorithms 'local extreme exchange' (LEE) and 'overall extreme exchange' (OEE) are presented by modifying Kernighan-Lin's two way uniform partitioning method. In algorithm LEE, a node which maximizes the reduced cost is selected and exchanged with a node in another cluster such that the gain from the exchange with the selected node is maximized. The computational time efficiency of LEE is verified to be excellent compared to Kernighan-Lin's method. Algorithm OEE which considers a node pair that maximizes the reduced exchange cost is illustrated to be superior to the Kernighan-Lin's method. The time requirement of the proposed algorithm is also shown to be smaller than that of Kernighan-Lin's procedure.

Published
1995

159. A tabu search for the survivable fiber optic communication network design

Author

Koh, Seok J. and Lee, Chae Y.

Subjects
Fiber optic networks -- Models
Abstract

A tabu search procedure is developed to solve fiber optic communication network design problems with survivability constraints. Two systematic improving heuristics: delete-add and delete-link procedures are presented. The conditions for the candidate links to be added and deleted in the two procedures are examined by considering the feasible structures of the survivable network. A local improvement procedure is considered by combining the two heuristics for the downhill move in the search procedure. Computational results show that the proposed tabu search outperforms the best known heuristic procedure in the literature.

Published
1995

160. Parallel genetic algorithms for the earliness-tardiness job scheduling problem with general penalty weights

Author

Lee, Chae Y. and Kim, Seok J.

Subjects
Scheduling (Management) -- Models
Abstract

The purpose of this paper is to develop parallel genetic algorithms for a job scheduling problem on a single machine. The objective of the scheduling is to minimize the total generally weighted earliness and tardiness penalties from a common due date. A binary representation scheme is employed for coding job schedules into chromosomes. Parallel subpopulations are constructed by considering only jobs that can be processed first in the schedule. Three important genetic algorithm operators; reproduction, crossover and mutation are implemented by reflecting the problem-specific properties. The efficiency of the parallel genetic algorithm is illustrated wtih computational results.

Published
1995

161. Observation and analysis of self-amplified spontaneous emission at the APS low-energy undulator test line

Author

Arnold, N.D, Attig, J, Banks, G, Bechtold, R, Beczek, K, Benson, C, Berg, S, Berg, W, Biedron, S.G, Biggs, J.A, Borland, M, Boerste, K, Bosek, M, Brzowski, W.R, Budz, J, Carwardine, J.A, Castro, P, Chae, Y.-C, Christensen, S, Clark, C, Conde, M, Crosbie, E.A, Decker, G.A, Dejus, R.J, DeLeon, H, Den Hartog, P.K, Deriy, B.N, Dohan, D, Dombrowski, P, Donkers, D, Doose, C.L, Dortwegt, R.J, Edwards, G.A, Eidelman, Y, Erdmann, M.J, Error, J, Ferry, R, Flood, R, Forrestal, J, Freund, H, Friedsam, H, Gagliano, J, Gai, W, Galayda, J.N, Gerig, R, Gilmore, R.L, Gluskin, E, Goeppner, G.A, Goetzen, J, Gold, C, Gorski, A.J, Grelick, A.E, Hahne, M.W, Hanuska, S, Harkay, K.C, Harris, G, Hillman, A.L, Hogrefe, R, Hoyt, J, Huang, Z, Jagger, J.M, Jansma, W.G, Jaski, M, Jones, S.J, Keane, R.T, Kelly, A.L, Keyser, C, Kim, K.-J, Kim, S.H, Kirshenbaum, M, Klick, J.H, Knoerzer, K, Koldenhoven, R.J, Knott, M, Labuda, S, Laird, R, Lang, J, Lenkszus, F, Lessner, E.S, Lewellen, J.W, Li, Y, Lill, R.M, Lumpkin, A.H, Makarov, O.A, Markovich, G.M, McDowell, M, McDowell, W.P, McNamara, P.E, Meier, T, Meyer, D, Michalek, W, Milton, S.V, Moe, H, Moog, E.R, Morrison, L, Nassiri, A, Noonan, J.R, Otto, R, Pace, J, Pasky, S.J, Penicka, J.M, Pietryla, A.F, Pile, G, Pitts, C, Power, J, Powers, T, Putnam, C.C, Puttkammer, A.J, Reigle, D, Reigle, L, Ronzhin, D, Rotela, E.R, Russell, E.F, Sajaev, V, Sarkar, S, Scapino, J.C, Schroeder, K, Seglem, R.A, Sereno, N.S, Sharma, S.K, Sidarous, J.F, Singh, O, Smith, T.L, Soliday, R, Sprau, G.A, Stein, S.J, Stejskal, B, Svirtun, V, Teng, L.C, Theres, E, Thompson, K, Tieman, B.J, Torres, J.A, Trakhtenberg, E.M, Travish, G, Trento, G.F, Vacca, J, Vasserman, I.B, Vinokurov, N.A, Walters, D.R, Wang, J, Wang, X.J, Warren, J, Wesling, S, Weyer, D.L, Wiemerslage, G, Wilhelmi, K, Wright, R, Wyncott, D, Xu, S, Yang, B.-X, Yoder, W, and Zabel, R.B

Published
2001
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163. Forkhead box M1 (FOXM1) transcription factor is a key oncogenic driver of aggressive human meningioma progression.

Author

Kim, H., Park, K.‐J., Ryu, B.‐K., Park, D.‐H., Kong, D.‐S., Chong, K., Chae, Y.‐S., Chung, Y.‐G., Park, S. I., and Kang, S.‐H.

Subjects
FORKHEAD transcription factors, TRANSCRIPTION factors, MENINGIOMA, PROGRESSION-free survival, CELL lines, WESTERN immunoblotting
Abstract

Aims: Aggressive meningioma remains incurable with neither chemo‐ nor targeted therapies proven effective, largely due to unidentified genetic alterations and/or aberrant oncogenic pathways driving the disease progression. In this study, we examined the expression and function of Forkhead box M1 (FOXM1) transcription factor during meningioma progression. Methods: Human meningioma samples (n = 101) were collected, followed by Western blotting, quantitative PCR, immunohistochemical and progression‐free survival (PFS) analyses. For in vitro assays, FOXM1 was overexpressed or knocked‐down in benign (SF4433 and SF4068) or malignant (SF3061 and IOMM‐Lee) human meningioma cell lines respectively. For in vivo studies, siomycin A (a FOXM1 inhibitor)‐pretreated or control IOMM‐Lee cells were implanted subcutaneously in nude mice. Results: FOXM1 expression was increased in higher grades of meningioma and correlated with the mitotic index in the tumour tissue. Moreover, FOXM1 was increased in recurrent meningioma compared with the matched primary lesions. The patients who had higher FOXM1 expression had shorter PFS. In the subsequent in vitro assays, knockdown of FOXM1 in malignant meningioma cell lines resulted in decreased tumour cell proliferation, angiogenesis and invasion, potentially via regulation of β‐catenin, cyclin D1, p21, interleukin‐8, vascular endothelial growth factor‐A, PLAU, and epithelial‐to‐mesenchymal transition‐related genes, whereas overexpression of FOXM1 in benign meningioma cell lines had the opposite effects. Last, suppression of FOXM1 using a pharmacological inhibitor, siomycin A, decreased tumour growth in an in vivo mouse model. Conclusions: Our data demonstrate that FOXM1 is a key transcription factor regulating oncogenic signalling pathways in meningioma progression, and a promising therapeutic target for aggressive meningioma. [ABSTRACT FROM AUTHOR]

Published
2020
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179. P2.07-037 Developing a Predictive Clinical Outcome Model for Advanced Non-Small Cell Lung Cancer Patients Receiving Nivolumab

Author

Park, W., primary, Kwon, D., additional, Saravia, D., additional, Desai, A., additional, Warsch, J., additional, Vargas, F., additional, El Dinali, M., additional, Elias, R., additional, Chae, Y., additional, Kim, D.W., additional, Warsch, S., additional, Ishkanian, A., additional, Ikpeazu, C., additional, Mudad, R., additional, Lopes, G., additional, and Jahanzeb, M., additional

Published
2017
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181. Increased 18F‐fluorodeoxyglucose uptake mimicking malignant lung tumour in a cat with lipid pneumonia.

Author

Lee, D., Yun, T., Koo, Y., Chae, Y., Kim, H., Yang, M. P., Lee, S., and Kang, B. T.

Subjects
PNEUMONIA, PULMONARY nodules, LUNGS, CATS, LIPIDS, CAT diseases
Abstract

This article discusses a case of an 8-year-old male neutered domestic shorthair cat with a pulmonary nodule. The size of the nodule increased over time, and a PET/CT scan was performed to evaluate its metabolic activity. The scan showed marked 18F-FDG uptake, suggesting a high probability of malignancy. However, histopathological examination revealed lipid pneumonia instead of a malignant lung tumor. This case highlights the importance of considering inflammation in lesions with high metabolic activity and demonstrates that lipid pneumonia can show increased 18F-FDG uptake. [Extracted from the article]

Published
2023
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182. Nucleation and growth of Cu films during the initial stage of chemical vapor deposition.

Author

Chae, Y. K. and Komiyama, H.

Subjects
*SEMICONDUCTOR films, *CHEMICAL vapor deposition
Abstract

The nucleation and growth of Cu nanoparticles during the initial stage of film growth by chemical vapor deposition was investigated using transmission electron microscopy and energy dispersive x-ray spectroscopy analysis. Cu nanoparticles did not migrate on the SiO[sub 2] surface because the Cu nanoparticles were deposited by autocatalytic reactions onto pre-existing nuclei, and therefore were strongly bonded to the surface. The initial growth mechanism of Cu nanoparticles appears to be that Cu particles deposit by surface reaction onto pre-existing nuclei, grow to become nanoparticles, and these nanoparticles form amorphous Cu islands. The amorphous Cu islands grow to become larger islands that consist of partially-crystallized Cu. The crystallized Cu particles then begin to form on the amorphous Cu phases. With increasing deposition time, the amorphous Cu phases completely convert into crystalline phases to form a crystalline film. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2001
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183. Ultrafast deposition of microcrystalline Si by thermal plasma chemical vapor deposition.

Author

Chae, Y. K., Ohno, H., Eguchi, K., and Yoshida, T.

Subjects
*MICROCRYSTALLINE polymers, *CHEMICAL vapor deposition
Abstract

This research is an attempt to apply thermal plasma chemical vapor deposition for the ultrafast deposition of Si films for solar cells. The improvement of stability, controllability, and cleanliness of the process enabled the deposition of μc-Si films at the ultrafast rate of over 1000 nm/s. Moreover, a minimum defect density of 7.2x10[sup 16] cm[sup -3] was achieved. Monte-Carlo simulation and step coverage analysis suggested that the precursor is an approximately 1 nm cluster with a sticking probability of about 0.6. The success of this research may change the established concepts of Si deposition technology. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2001
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184. MR2_ODMRP: Improvement of End-to-End Transmission Delay in Wireless Multicast Routing

Author

Kyoung Jin Oh and Chae Y. Lee

Subjects
Routing protocol, Transmission delay, Wireless mesh network, Protocol Independent Multicast, Multicast, business.industry, Computer science, Distributed computing, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Distance Vector Multicast Routing Protocol, Metrics, Computer Science Applications, ODMRP, Electrical and Electronic Engineering, business, Computer network
Abstract

With recent advances in wireless technology, the importance of the capability to use multiple transmission rates and multiple radios has been widely recognized. In this paper, multi-rate and multi-radio (MR2) characteristics are exploited to improve end-to-end transmission delay for reliable multicasts. To achieve this goal, maximum potential rate based on multiple rates and radio based transmission delay with a different number of available radios are investigated in the construction of multicast routes. Multi-rate multi-radio on-demand multicast routing protocol (MR2_ODMRP), a protocol that makes ODMRP suitable for a MR2 environment, is proposed. An integer linear programming model is proposed to obtain the optimal tree as well as the rate and radios at each node of the tree for each multicast service. The solution is employed to evaluate the performance of the MR2_ODMRP. From the simulation, it is shown that the MR2_ODMRP produces nearly optimal solutions even in environments with a large number of nodes. It outperforms the ODMRP in wireless mesh networks. The end-to-end transmission delay is improved by a factor of four compared to the ODMRP.

Published
2013

185. World Congress Integrative Medicine & Health 2017: part two Berlin, Germany. 3-5 May 2017 Abstracts

Author

Ee, C, Thuraisingam, S, Pirotta, M, French, S, Xue, C, Teede, H, Kristoffersen, AE, Sirois, F, Stub, T, Engler, J, Joos, S, Güthlin, C, Felenda, J, Beckmann, C, Stintzing, F, Evans, R, Bronfort, G, Keefe, D, Taberko, A, Hanson, L, Haley, A, Ma, H, Jolton, J, Yarosh, L, Keefe, F, Nam, J, Ojala, L, Kreitzer, MJ, Fink, C, Kraft, K, Flower, A, Lewith, G, Harman, K, Stuart, B, Bishop, FL, Frawley, J, Füleki, L, Kiss, E, Vancsik, T, Krenacs, T, Funabashi, M, Pohlman, KA, Mior, S, Thiel, H, Hill, MD, Cassidy, DJ, Westaway, M, Yager, J, Hurwitz, E, Kawchuk, GN, O’Beirne, M, Vohra, S, Gaboury, I, Morin, C, Gaertner, K, Torchetti, L, Frei-Erb, M, Kundi, M, Frass, M, Gallo, E, Maggini, V, Comite, M, Sofi, F, Baccetti, S, Vannacci, A, Di Stefano, M, Monechi, MV, Gori, L, Rossi, E, Firenzuoli, F, Mediati, RD, Ballerini, G, Gardiner, P, Lestoquoy, AS, Negash, L, Stillman, S, Shah, P, Liebschutz, J, Adelstein, P, Farrell-Riley, C, Brackup, I, Penti, B, Saper, R, Sampedro, IG, Carvajal, G, Gleiss, A, Gross, MM, Brendlin, D, Röttger, J, Stritter, W, Seifert, G, Grzanna, N, Stange, R, Guendling, PW, Gu, W, Lu, Y, Wang, J, Zhang, C, Bai, H, He, Y, Zhang, X, Zhang, Z, Wang, D, Meng, F, Hagel, A, Albrecht, H, Vollbracht, C, Dauth, W, Hagel, W, Vitali, F, Ganzleben, I, Schultis, H, Konturek, P, Stein, J, Neurath, M, Raithel, M, Krick, B, Haller, H, Klose, P, Dobos, G, Kümmel, S, Cramer, H, Saha, FJ, Kowoll, A, Ebner, B, Berger, B, Choi, K-E, He, L, Wang, H, He, X, Gu, C, Zhang, Y, Zhao, L, Tong, X, Ho, RST, Chung, VCH, Wu, X, Wong, CHL, Wu, JCY, Wong, SYS, Lau, AYL, Sit, RWS, Wong, W, Holmes, M, Bishop, F, Calman, L, Newell, D, Field, J, Htut, WL, Han, D, Choi, DI, Choi, SJ, Kim, HY, Hwang, JH, Huang, CW, Jang, BH, Chen, FP, Ko, SG, Huang, W, Jin, D, Lian, F, Jang, S, Kim, KH, Lee, EK, Sun, SH, Go, HY, Ko, Y, Park, S, Shin, YC, Janik, H, Greiffenhagen, N, Bolte, J, Jaworski, M, Adamus, M, Dobrzynska, A, Jeitler, M, Jaspers, J, von Scheidt, C, Koch, B, Michalsen, A, Steckhan, N, Kessler, C, Huang, W-J, Pang, B, Lian, F-M, Jong, M, Baars, E, Glockmann, A, Hamre, H, Kainuma, M, Murakami, A, Kubota, T, Kobayashi, D, Sumoto, Y, Furusyo, N, Ando, S-I, Shimazoe, T, Kelber, O, Verjee, S, Gorgus, E, Schrenk, D, Kemper, K, Hill, E, Rao, N, Gascon, G, Mahan, J, Kienle, G, Dietrich, J, Schmoor, C, Huber, R, Kim, WH, Ahmed, M, Meggyeshazi, N, Kovago, C, Klaus, AK, Zerm, R, Pranga, D, Ostermann, T, Reif, M, von Laue, HB, Brinkhaus, B, Kröz, M, Recchia, DR, Klein-Laansma, CT, von Hagens, C, Jansen, JP, van Wietmarschen, H, Jong, MC, Sun, S-H, Go, H-Y, Jeon, C-Y, Song, Y-K, Ko, S-G, Koch, AK, Rabsilber, S, Lauche, R, Langhorst, J, Trifunovic-Koenig, M, Koster, E, Delnoij, D, Kroll, L, Weiss, K, Kubo, A, Hendlish, S, Altschuler, A, Connolly, N, Avins, A, Wardle, J, Lee, D, Sibbritt, D, Adams, J, Park, C, Mishra, G, Lechner, J, Lee, I, Chae, Y, Lee, J, Cho, SH, Choi, Y, Lee, JY, Ryu, HS, Yoon, SS, Oh, HK, Hyun, LK, Kim, JO, Yoon, SW, Lee, J-Y, Shin, S-H, Jang, M, Müller, I, Park, S-HJ, Laird, L, Mitchell, S, Li, X, Wang, Y, Zhen, J, Yu, H, Liu, T, Gu, X, Liu, H, Ma, W, Shang, X, Bai, Y, Liu, W, Rooney, C, Smith, A, Lopes, S, Demarzo, M, do Patrocínio Nunes, M, Lorenz, P, Gründemann, C, Heinrich, M, Garcia-Käufer, M, Grunewald, F, Messerschmidt, S, Herrick, A, Gruber, K, Knödler, M, Steinborn, C, Lu, T, Wang, L, Wu, D, Luberto, CM, Hall, DL, Chad-Friedman, E, Lechner, S, Park, ER, Park, E, Goodman, J, Luer, S, Heri, M, von Ammon, K, Landini, I, Lapucci, A, Nobili, S, Mini, E, McDermott, C, Richards, S, Cox, D, Frossell, S, Leydon, G, Eyles, C, Raphael, H, Rogers, R, Selby, M, Adler, C, Allam, J, Bu, X, Zhang, H, Zhang, J, Mikolasek, M, Berg, J, Witt, C, Barth, J, Miskulin, I, Lalic, Z, Miskulin, M, Dumic, A, Sebo, D, Vcev, A, Mohammed, NAA, Im, HB, Mukherjee, A, Kandhare, A, Bodhankar, S, Thakurdesai, P, Munk, N, Evans, E, Froman, A, Kline, M, Bair, MJ, Musial, F, Alræk, T, Hamre, HJ, Björkman, L, Fønnebø, VM, Ni, Q, Tong, X-L, Li, X-L, Liu, W-K, Feng, S, Zhao, X-Y, Zheng, Y-J, Zhao, X-M, Lin, Y-Q, Zhao, T-Y, Phd, HC, Liu, F, Zhao, L-H, Ye, R, Gu, C-J, Peng, W, De Carvalho, D, El-Bayoumi, M, Haig, B, Kelly, K, Wade, DJ, Portalupi, E, Gobo, G, Bellavita, L, Guglielmetti, C, Raak, C, Teuber, M, Molsberger, F, von Rath, U, Reichelt, U, Schwanebeck, U, Zeil, S, Vogelberg, C, Veintimilla, DR, Mery, GT, Villavicencio, MM, Moran, SH, Sachse, C, Gündlin, PW, Sahebkarkhorasani, M, Azizi, H, Schumann, D, Sundberg, T, Leach, MJ, Seca, S, Greten, H, Selliah, S, Shakya, A, Sherbakova, A, Ulrich-Merzenich, G, Abdel-Aziz, H, Sibinga, E, Webb, L, Ellen, J, Skrautvol, K, Nåden, D, Song, R, Grabowska, W, Osypiuk, K, Diaz, GV, Bonato, P, Park, M, Hausdorff, J, Fox, M, Sudarsky, LR, Tarsy, D, Novakowski, J, Macklin, EA, Wayne, PM, Hwang, I, Ahn, S, Lee, M-A, Sohn, MK, Sorokin, O, Heydeck, D, Borchert, A, Hohmann, C-D, Kühn, H, Kirschbaum, C, Stalder, T, Stöckigt, B, Teut, M, Suhr, R, Sulmann, D, Streeter, C, Gerbarg, P, Silveri, M, Brown, R, Jensen, J, Rutert, B, Eggert, A, Längler, A, Holmberg, C, Sun, J, Deng, X, Li, W-Y, Wen, B, Robinson, N, Liu, J-P, Sung, HK, Yang, N, Shin, SM, Jung, H, Kim, YJ, Jung, WS, Park, TY, Suzuki, K, Ito, T, Uchida, S, Kamohara, S, Ono, N, Takamura, M, Yokochi, A, Maruyama, K, Tapia, P, Thabaut, K, Thronicke, A, Steele, M, Matthes, H, Herbstreit, C, Schad, F, Tian, J, Yang, L, Tian, T, Tian, X, Wang, C, Chai, QY, Zhang, L, Xia, R, Huang, N, Fei, Y, Liu, J, Trent, N, Miraglia, M, Dusek, J, Pasalis, E, Khalsa, SB, Trifunovic-König, M, Koch, A, Uebelacker, L, Tremont, G, Gillette, L, Epstein-Lubow, G, Strong, D, Abrantes, A, Tyrka, A, Tran, T, Gaudiano, B, Miller, I, Ullmann, G, Li, Y, Vaidya, S, Marathe, V, Vale, AC, Motta, J, Donadão, F, Valente, AC, Valente, LCC, Ghelman, R, Vesovic, D, Jevdic, D, Jevdic, A, Jevdic, K, Djacic, M, Letic, D, Bozic, D, Markovic, M, Dunjic, S, Ruscuklic, G, Baksa, D, Vrca, K, Vincent, A, Wahner-Roedler, D, Whipple, M, Vogelius, MM, Friesecke, I, Gündling, PW, Mahapatra, S, Hynes, R, Van Rooy, K, Looker, S, Ghosh, A, Bauer, B, Cutshall, S, Walach, H, Flores, AB, Ofner, M, Kastner, A, Schwarzl, G, Schwameder, H, Alexander, N, Strutzenberger, G, Wang, S, Shi, J, Hao, Y, Wu, J, Qiu, Z, Wang, Y-H, Lou, C-J, Watts, S, Wayne, P, Vergara-Diaz, G, Gow, B, Miranda, J, Sudarsky, L, Macklin, E, Wode, K, Bergqvist, J, Bernhardsson, B-M, Nordberg, JH, Sharp, L, Henriksson, R, Woo, Y, Hyun, MK, Wu, H, Wang, T-F, Zhao, Y, Wei, Y, Tian, L, Wang, X, Wu, R, Han, M, Caldwell, PHY, Liu, S, Chai, Q, Guo, Z, Liu, Z, Yang, IJ, Lincha, VR, Ahn, SH, Lee, DU, Shin, HM, Sung, H, Kim, Y, Yap, A, Kwan, YH, Tan, CS, Ibrahim, S, Ang, SB, Yayi, A, Yoo, JE, Yoo, HR, Jang, SB, Lee, HL, Youssef, A, Ezzat, S, Motaal, AA, El-Askary, H, Yu, X, Cui, Y, Yun, Y, Ahn, J-H, Jang, B-H, Kim, K-S, Choi, I, Glinz, A, ten Brink, F, Büssing, A, Gutenbrunner, C, Helbrecht, B, Fang, T, Shen, Z, Zhang, R, Wu, F, Li, M, Xuan, X, Shen, X, Ren, K, Berman, B, Zheng, Z, Wan, Y, Ma, X, Dong, F, Zick, S, Harris, R, Bae, GE, Kwon, JN, Lee, HY, Nam, JK, Lee, SD, Lee, DH, Han, JY, Yun, YJ, Lee, JH, Park, HL, Park, SH, Bocci, C, Ivaldi, GB, Vietti, I, Meaglia, I, Guffi, M, Ruggiero, R, Gualea, M, Longa, E, Bonucci, M, Croke, S, Rodriguez, LD, Caracuel-Martínez, JC, Fajardo-Rodríguez, MF, Ariza-García, A, la Fuente, FG-D, Arroyo-Morales, M, Estrems, MS, Gómez, VG, Sabater, MV, Ferreri, R, Bernardini, S, Pulcri, R, Cracolici, F, Rinaldi, M, Porciani, C, Fisher, P, Hughes, J, Mendoza, A, MacPherson, H, Filshie, J, Di Francesco, A, Bernardini, A, Messe, M, Primitivo, V, Iasella, PA, Taminato, M, Alcantara, JDC, De Oliveira, KR, Rodrigues, DCDA, Mumme, JRC, Sunakozawa, OKM, Filho, VO, Goldenberg, J, Day, A, Sasagawa, M, Ward, L, Cooley, K, Gunnarsdottir, T, Hjaltadottir, I, Hajimonfarednejad, M, Hannan, N, Hellsing, R, Andermo, S, Arman, M, von Hörsten, I, Torrielo, PV, Vilaró, CLA, Cabrera, FC, Hui, H, Ziea, E, Tsui, D, Hsieh, J, Lam, C, Chan, E, Jensen, MP, Battalio, SL, Chan, J, Edwards, KA, Gertz, KJ, Day, MA, Sherlin, LH, Ehde, DM, Börner, A, Lee, B, Chang, GT, Menassa, A, Motoo, Y, Müller, J, Rabini, S, Vinson, B, Storr, M, Niemeijer, M, Hoekman, J, Ruijssenaaars, W, Njoku, FC, Norheim, AJ, Okumus, F, Oncu-Celik, H, Ee, C, Thuraisingam, S, Pirotta, M, French, S, Xue, C, Teede, H, Kristoffersen, AE, Sirois, F, Stub, T, Engler, J, Joos, S, Güthlin, C, Felenda, J, Beckmann, C, Stintzing, F, Evans, R, Bronfort, G, Keefe, D, Taberko, A, Hanson, L, Haley, A, Ma, H, Jolton, J, Yarosh, L, Keefe, F, Nam, J, Ojala, L, Kreitzer, MJ, Fink, C, Kraft, K, Flower, A, Lewith, G, Harman, K, Stuart, B, Bishop, FL, Frawley, J, Füleki, L, Kiss, E, Vancsik, T, Krenacs, T, Funabashi, M, Pohlman, KA, Mior, S, Thiel, H, Hill, MD, Cassidy, DJ, Westaway, M, Yager, J, Hurwitz, E, Kawchuk, GN, O’Beirne, M, Vohra, S, Gaboury, I, Morin, C, Gaertner, K, Torchetti, L, Frei-Erb, M, Kundi, M, Frass, M, Gallo, E, Maggini, V, Comite, M, Sofi, F, Baccetti, S, Vannacci, A, Di Stefano, M, Monechi, MV, Gori, L, Rossi, E, Firenzuoli, F, Mediati, RD, Ballerini, G, Gardiner, P, Lestoquoy, AS, Negash, L, Stillman, S, Shah, P, Liebschutz, J, Adelstein, P, Farrell-Riley, C, Brackup, I, Penti, B, Saper, R, Sampedro, IG, Carvajal, G, Gleiss, A, Gross, MM, Brendlin, D, Röttger, J, Stritter, W, Seifert, G, Grzanna, N, Stange, R, Guendling, PW, Gu, W, Lu, Y, Wang, J, Zhang, C, Bai, H, He, Y, Zhang, X, Zhang, Z, Wang, D, Meng, F, Hagel, A, Albrecht, H, Vollbracht, C, Dauth, W, Hagel, W, Vitali, F, Ganzleben, I, Schultis, H, Konturek, P, Stein, J, Neurath, M, Raithel, M, Krick, B, Haller, H, Klose, P, Dobos, G, Kümmel, S, Cramer, H, Saha, FJ, Kowoll, A, Ebner, B, Berger, B, Choi, K-E, He, L, Wang, H, He, X, Gu, C, Zhang, Y, Zhao, L, Tong, X, Ho, RST, Chung, VCH, Wu, X, Wong, CHL, Wu, JCY, Wong, SYS, Lau, AYL, Sit, RWS, Wong, W, Holmes, M, Bishop, F, Calman, L, Newell, D, Field, J, Htut, WL, Han, D, Choi, DI, Choi, SJ, Kim, HY, Hwang, JH, Huang, CW, Jang, BH, Chen, FP, Ko, SG, Huang, W, Jin, D, Lian, F, Jang, S, Kim, KH, Lee, EK, Sun, SH, Go, HY, Ko, Y, Park, S, Shin, YC, Janik, H, Greiffenhagen, N, Bolte, J, Jaworski, M, Adamus, M, Dobrzynska, A, Jeitler, M, Jaspers, J, von Scheidt, C, Koch, B, Michalsen, A, Steckhan, N, Kessler, C, Huang, W-J, Pang, B, Lian, F-M, Jong, M, Baars, E, Glockmann, A, Hamre, H, Kainuma, M, Murakami, A, Kubota, T, Kobayashi, D, Sumoto, Y, Furusyo, N, Ando, S-I, Shimazoe, T, Kelber, O, Verjee, S, Gorgus, E, Schrenk, D, Kemper, K, Hill, E, Rao, N, Gascon, G, Mahan, J, Kienle, G, Dietrich, J, Schmoor, C, Huber, R, Kim, WH, Ahmed, M, Meggyeshazi, N, Kovago, C, Klaus, AK, Zerm, R, Pranga, D, Ostermann, T, Reif, M, von Laue, HB, Brinkhaus, B, Kröz, M, Recchia, DR, Klein-Laansma, CT, von Hagens, C, Jansen, JP, van Wietmarschen, H, Jong, MC, Sun, S-H, Go, H-Y, Jeon, C-Y, Song, Y-K, Ko, S-G, Koch, AK, Rabsilber, S, Lauche, R, Langhorst, J, Trifunovic-Koenig, M, Koster, E, Delnoij, D, Kroll, L, Weiss, K, Kubo, A, Hendlish, S, Altschuler, A, Connolly, N, Avins, A, Wardle, J, Lee, D, Sibbritt, D, Adams, J, Park, C, Mishra, G, Lechner, J, Lee, I, Chae, Y, Lee, J, Cho, SH, Choi, Y, Lee, JY, Ryu, HS, Yoon, SS, Oh, HK, Hyun, LK, Kim, JO, Yoon, SW, Lee, J-Y, Shin, S-H, Jang, M, Müller, I, Park, S-HJ, Laird, L, Mitchell, S, Li, X, Wang, Y, Zhen, J, Yu, H, Liu, T, Gu, X, Liu, H, Ma, W, Shang, X, Bai, Y, Liu, W, Rooney, C, Smith, A, Lopes, S, Demarzo, M, do Patrocínio Nunes, M, Lorenz, P, Gründemann, C, Heinrich, M, Garcia-Käufer, M, Grunewald, F, Messerschmidt, S, Herrick, A, Gruber, K, Knödler, M, Steinborn, C, Lu, T, Wang, L, Wu, D, Luberto, CM, Hall, DL, Chad-Friedman, E, Lechner, S, Park, ER, Park, E, Goodman, J, Luer, S, Heri, M, von Ammon, K, Landini, I, Lapucci, A, Nobili, S, Mini, E, McDermott, C, Richards, S, Cox, D, Frossell, S, Leydon, G, Eyles, C, Raphael, H, Rogers, R, Selby, M, Adler, C, Allam, J, Bu, X, Zhang, H, Zhang, J, Mikolasek, M, Berg, J, Witt, C, Barth, J, Miskulin, I, Lalic, Z, Miskulin, M, Dumic, A, Sebo, D, Vcev, A, Mohammed, NAA, Im, HB, Mukherjee, A, Kandhare, A, Bodhankar, S, Thakurdesai, P, Munk, N, Evans, E, Froman, A, Kline, M, Bair, MJ, Musial, F, Alræk, T, Hamre, HJ, Björkman, L, Fønnebø, VM, Ni, Q, Tong, X-L, Li, X-L, Liu, W-K, Feng, S, Zhao, X-Y, Zheng, Y-J, Zhao, X-M, Lin, Y-Q, Zhao, T-Y, Phd, HC, Liu, F, Zhao, L-H, Ye, R, Gu, C-J, Peng, W, De Carvalho, D, El-Bayoumi, M, Haig, B, Kelly, K, Wade, DJ, Portalupi, E, Gobo, G, Bellavita, L, Guglielmetti, C, Raak, C, Teuber, M, Molsberger, F, von Rath, U, Reichelt, U, Schwanebeck, U, Zeil, S, Vogelberg, C, Veintimilla, DR, Mery, GT, Villavicencio, MM, Moran, SH, Sachse, C, Gündlin, PW, Sahebkarkhorasani, M, Azizi, H, Schumann, D, Sundberg, T, Leach, MJ, Seca, S, Greten, H, Selliah, S, Shakya, A, Sherbakova, A, Ulrich-Merzenich, G, Abdel-Aziz, H, Sibinga, E, Webb, L, Ellen, J, Skrautvol, K, Nåden, D, Song, R, Grabowska, W, Osypiuk, K, Diaz, GV, Bonato, P, Park, M, Hausdorff, J, Fox, M, Sudarsky, LR, Tarsy, D, Novakowski, J, Macklin, EA, Wayne, PM, Hwang, I, Ahn, S, Lee, M-A, Sohn, MK, Sorokin, O, Heydeck, D, Borchert, A, Hohmann, C-D, Kühn, H, Kirschbaum, C, Stalder, T, Stöckigt, B, Teut, M, Suhr, R, Sulmann, D, Streeter, C, Gerbarg, P, Silveri, M, Brown, R, Jensen, J, Rutert, B, Eggert, A, Längler, A, Holmberg, C, Sun, J, Deng, X, Li, W-Y, Wen, B, Robinson, N, Liu, J-P, Sung, HK, Yang, N, Shin, SM, Jung, H, Kim, YJ, Jung, WS, Park, TY, Suzuki, K, Ito, T, Uchida, S, Kamohara, S, Ono, N, Takamura, M, Yokochi, A, Maruyama, K, Tapia, P, Thabaut, K, Thronicke, A, Steele, M, Matthes, H, Herbstreit, C, Schad, F, Tian, J, Yang, L, Tian, T, Tian, X, Wang, C, Chai, QY, Zhang, L, Xia, R, Huang, N, Fei, Y, Liu, J, Trent, N, Miraglia, M, Dusek, J, Pasalis, E, Khalsa, SB, Trifunovic-König, M, Koch, A, Uebelacker, L, Tremont, G, Gillette, L, Epstein-Lubow, G, Strong, D, Abrantes, A, Tyrka, A, Tran, T, Gaudiano, B, Miller, I, Ullmann, G, Li, Y, Vaidya, S, Marathe, V, Vale, AC, Motta, J, Donadão, F, Valente, AC, Valente, LCC, Ghelman, R, Vesovic, D, Jevdic, D, Jevdic, A, Jevdic, K, Djacic, M, Letic, D, Bozic, D, Markovic, M, Dunjic, S, Ruscuklic, G, Baksa, D, Vrca, K, Vincent, A, Wahner-Roedler, D, Whipple, M, Vogelius, MM, Friesecke, I, Gündling, PW, Mahapatra, S, Hynes, R, Van Rooy, K, Looker, S, Ghosh, A, Bauer, B, Cutshall, S, Walach, H, Flores, AB, Ofner, M, Kastner, A, Schwarzl, G, Schwameder, H, Alexander, N, Strutzenberger, G, Wang, S, Shi, J, Hao, Y, Wu, J, Qiu, Z, Wang, Y-H, Lou, C-J, Watts, S, Wayne, P, Vergara-Diaz, G, Gow, B, Miranda, J, Sudarsky, L, Macklin, E, Wode, K, Bergqvist, J, Bernhardsson, B-M, Nordberg, JH, Sharp, L, Henriksson, R, Woo, Y, Hyun, MK, Wu, H, Wang, T-F, Zhao, Y, Wei, Y, Tian, L, Wang, X, Wu, R, Han, M, Caldwell, PHY, Liu, S, Chai, Q, Guo, Z, Liu, Z, Yang, IJ, Lincha, VR, Ahn, SH, Lee, DU, Shin, HM, Sung, H, Kim, Y, Yap, A, Kwan, YH, Tan, CS, Ibrahim, S, Ang, SB, Yayi, A, Yoo, JE, Yoo, HR, Jang, SB, Lee, HL, Youssef, A, Ezzat, S, Motaal, AA, El-Askary, H, Yu, X, Cui, Y, Yun, Y, Ahn, J-H, Jang, B-H, Kim, K-S, Choi, I, Glinz, A, ten Brink, F, Büssing, A, Gutenbrunner, C, Helbrecht, B, Fang, T, Shen, Z, Zhang, R, Wu, F, Li, M, Xuan, X, Shen, X, Ren, K, Berman, B, Zheng, Z, Wan, Y, Ma, X, Dong, F, Zick, S, Harris, R, Bae, GE, Kwon, JN, Lee, HY, Nam, JK, Lee, SD, Lee, DH, Han, JY, Yun, YJ, Lee, JH, Park, HL, Park, SH, Bocci, C, Ivaldi, GB, Vietti, I, Meaglia, I, Guffi, M, Ruggiero, R, Gualea, M, Longa, E, Bonucci, M, Croke, S, Rodriguez, LD, Caracuel-Martínez, JC, Fajardo-Rodríguez, MF, Ariza-García, A, la Fuente, FG-D, Arroyo-Morales, M, Estrems, MS, Gómez, VG, Sabater, MV, Ferreri, R, Bernardini, S, Pulcri, R, Cracolici, F, Rinaldi, M, Porciani, C, Fisher, P, Hughes, J, Mendoza, A, MacPherson, H, Filshie, J, Di Francesco, A, Bernardini, A, Messe, M, Primitivo, V, Iasella, PA, Taminato, M, Alcantara, JDC, De Oliveira, KR, Rodrigues, DCDA, Mumme, JRC, Sunakozawa, OKM, Filho, VO, Goldenberg, J, Day, A, Sasagawa, M, Ward, L, Cooley, K, Gunnarsdottir, T, Hjaltadottir, I, Hajimonfarednejad, M, Hannan, N, Hellsing, R, Andermo, S, Arman, M, von Hörsten, I, Torrielo, PV, Vilaró, CLA, Cabrera, FC, Hui, H, Ziea, E, Tsui, D, Hsieh, J, Lam, C, Chan, E, Jensen, MP, Battalio, SL, Chan, J, Edwards, KA, Gertz, KJ, Day, MA, Sherlin, LH, Ehde, DM, Börner, A, Lee, B, Chang, GT, Menassa, A, Motoo, Y, Müller, J, Rabini, S, Vinson, B, Storr, M, Niemeijer, M, Hoekman, J, Ruijssenaaars, W, Njoku, FC, Norheim, AJ, Okumus, F, and Oncu-Celik, H

Published
2017

186. Fileshader : Entrusted Data Integration Using Hash Server

Author

Juhyeon Oh and Chae Y. Lee

Subjects
Database, business.industry, Computer science, Stub file, computer.file_format, Unix file types, computer.software_genre, Torrent file, Self-certifying File System, Data_FILES, File area network, File transfer, Versioning file system, SSH File Transfer Protocol, business, computer, Computer network
Abstract

The importance of security is increasing in a current network system. We have found a big security weakness at the file integration when the people download or upload a file and propose a novel solution how to ensure the security of a file. In particular, hash value can be applied to ensure a file due to a speed and architecture of file transfer. Hash server stores all the hash values which are updated by file provider and client can use these values to entrust file when it downloads. FileShader detects to file changes correctly, and we observed that it did not show big performance degradation. We expect FileShader can be applied current network systems practically, and it can increase a security level of all internet users.

Published
2016

189. Cell Planning in WCDMA Networks for Service Specific Coverage and Load Balancing

Author

Hyun Moon Shin and Chae Y. Lee

Subjects
Network Load Balancing Services, Computer science, business.industry, Network packet, Telecommunications link, Data as a service, Electrical and Electronic Engineering, Load balancing (computing), business, Integer programming, Upper and lower bounds, Computer Science Applications, Computer network
Abstract

Third-generation (3G) Wideband Code Division Multiple Access network is an evolutionary network which supports services from circuit-based voice service to high and low rate packet-based data services. Unlike the voice oriented second-generation service, the 3G network is enhanced to support services with different data rate, different asymmetry, and different coverage. We thus need to investigate the coverage of multiple services and the capacity of a cell in cell planning for the advanced network. Service specific uplink coverage and downlink capacity with load balancing are considered in our cell planning. The problem is formulated as a linear integer programming optimization model. An efficient tabu search heuristic is developed to solve the NP-hard problem. Very promising computational results are demonstrated, where the solution gap from the optimal to the lower bound by CPLEX is within 0.9% in problems to cover all service traffic in the system. It is demonstrated that higher load factor effectively reduces cell sites for multiple service classes. Load balancing among cells is also demonstrated with different coverage ratio.

Published
2011

190. Optimal rate allocation and QoS-sensitive admission control in wireless integrated networks

Author

Hyun Moon Shin and Chae Y. Lee

Subjects
Stochastic geometry models of wireless networks, Computer Science::Computer Science and Game Theory, Computer Networks and Communications, business.industry, Wireless network, Network packet, Computer science, Quality of service, Call Admission Control, Distributed computing, Local area network, Wireless WAN, Admission control, Computer Science::Networking and Internet Architecture, Cellular network, Wireless, Network performance, Electrical and Electronic Engineering, Radio resource management, business, Information Systems, Computer network
Abstract

The problem of Call Admission Control and rate allocation in loosely coupled wireless integrated networks is investigated. The related Radio Resource Management schemes were introduced to improve network performance in wireless integrated networks. However, these schemes did not reflect the independence and competitiveness of loosely coupled wireless integrated networks. Furthermore, given that users have different requirements for price and Quality of Service (QoS), they are able to select a network according to their preference. We consider a scenario with two competitive wireless networks, namely Universal Mobile Telecommunications System cellular networks and Wireless Local Area Networks. Users generate two types of traffic with different QoS requirements: real-time and non-real-time. We propose a scheme that exploits a mathematical model for the control of call admission and adopt a noncooperative game theory-based approach to address the rate allocation problem. The purpose is to maximize the revenue of the network providers while guaranteeing a level of QoS according to user needs. Simulation results show that the proposed scheme provides better network performance with respect to packet loss rate, packet delay time, and call-blocking probability than other schemes when the data rates are allocated to each call at the point that maximizes the revenue of network providers. We further demonstrate that a Nash equilibrium always exists for the considered games.

Published
2010

191. Dynamic hybrid duplex for rate maximization in OFDMA

Author

Chae Y. Lee and Sangmin Oh

Subjects
Mathematical optimization, Computer Networks and Communications, Computer science, Orthogonal frequency-division multiple access, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Duplex (telecommunications), Data_CODINGANDINFORMATIONTHEORY, Maximization, Subcarrier, Telecommunications link, Resource allocation, Electrical and Electronic Engineering, Simulation, Information Systems
Abstract

Orthogonal frequency division multiple access (OFDMA) is considered as one of the technologies for 4th generation (4G) due to its robustness against multi-path environment. OFDMA also has the advantage of flexibility in resource allocation, which cannot be supported by existing duplex schemes. In this paper, we propose dynamic hybrid duplex (DHD) which will enhance the efficiency and flexibility of the OFDMA system. To establish the framework of resource allocation for the DHD, we formulate DHD resource allocation problem (DRAP) which maximizes the total users' data rate with power, rate, and subcarrier allocation constraints. A heuristic procedure is developed to solve the problem. The procedure finds the best mode and the best amount of resources allocated to downlink (DL) and uplink (UL). Simulation is performed with five scenarios to evaluate the DHD. Its results show that the proposed DHD outperforms other duplex schemes in various environments. Copyright © 2010 John Wiley & Sons, Ltd. (In this paper, we propose dynamic hybrid duplex (DHD) which will enhance the efficiency and flexibility of the OFDMA system. By exploiting changeable duplex mode, flexible resource allocation, and user information, DHD optimizes OFDMA systems adaptively.)

Published
2010

192. Downlink Capacity Analysis of Collaborative Crossed Timeslots in CDMA TDD Systems

Author

Ki Won Sung, Agnes Gravrand, Chae Y. Lee, and Kwang Hyuk Yim

Subjects
Channel capacity, Time-division multiplexing, Computer science, Code division multiple access, business.industry, Telecommunications link, Fading, Electrical and Electronic Engineering, Communications system, business, Simulation, Computer Science Applications, Computer network
Abstract

Traffic asymmetry between uplink and downlink is expected to be a remarkable 3G characteristic in cellular mobile multimedia communications. CDMA system with TDD is a good solution to this traffic asymmetry. However, the level of traffic asymmetry may be significantly different from a cell to another cell. To tackle this problem and to support the traffic hot spot, crossed slots are examined. The use of crossed slots is restricted within a certain range of a cell by investigating the inter-cell interference and the maximum planned load factor. We examine the radius of inner zone and discuss the capacity of downlink crossed slots for various neighbor cell environments. Computational results show that the capacity increase in the target cell is outstanding by reducing the service range of neighbor cells. When all six neighbors reduce their service range by 20%, the capacity at target cell crossed slot is increased by 35%. Monte Carlo simulation is performed with large scale fading to verify the numerical analysis.

Published
2008

193. Radiation-induced hepatic toxicity after radiotherapy combined with chemotherapy for hepatocellular carcinoma

Author

Su J, Shim, Jinsil, Seong, Ik J, Lee, Kwang H, Han, Chae Y, Chon, and Sang H, Ahn

Subjects
Oncology, Chemotherapy, medicine.medical_specialty, Hepatology, business.industry, medicine.medical_treatment, Radiation induced, medicine.disease, Hepatic toxicity, Radiation therapy, Infectious Diseases, Internal medicine, Hepatocellular carcinoma, Medicine, business
Abstract

The purpose of the present study was to analyze hepatic toxicity following radiotherapy combined with regional chemotherapy for hepatocellular carcinoma (HCC).From 2001 to 2003, a total of 132 patients with HCC received 3-D conformal radiation therapy (3D-CRT) combined with chemotherapy. Patients were divided into two groups based on drug localization: the transcatheter arterial chemoembolization (TACE) group, where the chemotherapeutic drug (adriamycin) was localized within the tumor, and the non-TACE group, where the drugs (adriamycin, cisplatin, 5-fluorouracil) were diffusely spread over the entire liver.Patients were evaluated by biochemical parameters for any hepatic toxicity prior to, during, and until 12 months after 3D-CRT. Hepatic toxicity was defined as radiation-induced liver disease (RILD) or combined modality-induced liver disease (CMILD), which is defined as RILD with abnormal elevation of total bilirubin levels. In the TACE group, three patients developed RILD (5.6%) and none developed CMILD. In the non-TACE group, three patients (3.7%) and seven patients (8.8%) developed RILD and CMILD, respectively.Hepatic toxicity following radiotherapy combined with regional chemotherapy for HCC might be influenced by the distribution of the chemotherapeutic drugs. A more precise understanding of hepatic toxicity from chemoradiotherapy will help design optimal treatments for HCC.

Published
2007

194. Discrete bandwidth allocation considering fairness and transmission load in multicast networks

Author

Hee K. Cho and Chae Y. Lee

Subjects
Mathematical optimization, General Computer Science, Multicast, Protocol Independent Multicast, business.industry, Computer science, Retransmission, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Management Science and Operations Research, Tabu search, Bandwidth allocation, Source-specific multicast, Transmission (telecommunications), Modeling and Simulation, Xcast, business, Computer network
Abstract

As a promising solution to tackle the network heterogeneity in multicasting, layered multicast protocols such as receiver-driven layered multicast (RLM) and layered video multicast with retransmission (LVMR) have been proposed. This paper considers fairness as well as transmission load in the layered multicasting. Lexicographically fair bandwidth allocation among multicast receivers is considered under the constraint of minimum bandwidth requirement and the link capacity of the network. The problem of transmission load in the layer multicasting due to various user requirements is also examined by minimizing the number of layers. The bandwidth allocation is formulated as a nonlinear integer programming problem. A dual-objective tabu search is proposed to solve the fairness and transmission load problem in multicast networks. Outstanding performance is obtained by the proposed tabu search. When the fairness objective is considered, the solution gap from the optimal solution is less than 2% in problems with 50 virtual sessions. The complexity of the dual objective largely depends on the weighting factor of the two objectives. Even in tough cases the proposed tabu search provides excellent solution, whose gap is within 6% from the optimal solution.

Published
2007

196. Determination of the multi-slot transmission in Bluetooth systems with the estimation of the channel error probability

Author

Chae Y. Lee and Ki Won Sung

Subjects
Computer Networks and Communications, Network packet, Estimation theory, Computer science, business.industry, Radio Link Protocol, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Throughput, Communications system, law.invention, Bluetooth, Transmission (telecommunications), law, Segmentation and Reassembly, Statistics, Frequency-hopping spread spectrum, Wireless, Electrical and Electronic Engineering, business, Algorithm, Information Systems, Communication channel
Abstract

Bluetooth is an open specification for a technology to enable short-range wireless communications that operate in an ad hoc fashion. Bluetooth uses frequency hopping with a slot length of 625 μs. Each slot corresponds to a packet and multi-slot packets of three or five slots can be transmitted to enhance the transmission efficiency. However, the use of multi-slot packet may degrade the transmission performance under high channel error probability. Thus, the length of multi-slot should be adjusted according to the current channel condition. Segmentation and reassembly (SAR) operation of Bluetooth enables the adjustment of the length of multi-slot. In this paper, we propose an efficient multi-slot transmission scheme that adaptively determines the optimal length of slots of a packet according to the channel error probability. We first discuss the throughput of a Bluetooth connection as a function of the length of a multi-slot and the channel error probability. A decision criteria which gives the optimal length of the multi-slot is presented under the assumption that the channel error probability is known. For the implementation in the real Bluetooth system, the channel error probability is estimated with the maximum likelihood estimator (MLE). A simple decision rule for the optimal multi-slot length is developed to maximize the throughput. Simulation experiment shows that the proposed decision rule for the multi-slot transmission effectively provides the maximum throughput under any type of channel error correlation. Copyright © 2005 John Wiley & Sons, Ltd.

Published
2006

197. Effect of different doses of ketamine with low-dose rocuronium on intubation conditions in children: prospective randomized double blind trial.

Author

HWANG, J., CHAE, Y. J., HA, S., and YI, I. K.

Abstract

OBJECTIVE: The effect of ketamine on intubation condition, when used as an induction agent with low-dose rocuronium, is unknown. This study aimed to compare the effects of three doses of ketamine used with 0.3 mg/kg rocuronium and 1 μg/kg fentanyl on intubation conditions in children undergoing short elective surgery. PATIENTS AND METHODS: The study was performed as a prospective, randomized double-blind clinical trial. A total of 60 children aged 2 to 12 years, who were scheduled for inguinal herniorrhaphy under general anesthesia, were randomly allocated into three groups on the basis of ketamine dose: 1 mg/kg (Group K1, n = 20), 1.5 mg/kg (Group K1.5, n = 20), and 2 mg/kg (Group K2, n = 20). The primary outcome was the intubation condition. Other assessments included hemodynamic data, recovery profile, adverse events in the postanesthetic care unit (PACU) and use of fentanyl as a rescue analgesic in the PACU were also assessed. RESULTS: The occurrence of a clinically acceptable intubation condition increased with the use of an increased dose (≥ 1.5 mg/kg) (K1/K1.5/K2: 30%/65%/65%; p=0.038, for trends p=0.028). Hemodynamic data, recovery profile and adverse events in PACU showed no difference among groups. Fentanyl dose used in the PACU was higher in K1 than K2 and the number of patients requiring rescue analgesics in the PACU decreased in accordance with the dose of ketamine (K1/K1.5/K2: 30%/15%/0%; p=.031, for trends p=0.013). CONCLUSIONS: Different intubation conditions were observed on the basis of ketamine dose used in conjunction with 0.3 mg/kg rocuronium and fentanyl 1 μg/kg. Ketamine dose ≥ 1.5 mg/kg with low-dose rocuronium should be used to improve intubation conditions in pediatrics. [ABSTRACT FROM AUTHOR]

Published
2019

198. Cell Planning with Capacity Expansion in Mobile Communications: A Tabu Search Approach

Author

Lee, Chae Y. and Kang, Hyon G.

Subjects
Wireless communication systems -- Design and construction, Spread spectrum communications -- Research, Linear programming -- Analysis, Genetic algorithms -- Usage, Business, Electronics, Electronics and electrical industries, Transportation industry
Abstract

Cell planning problem with capacity expansion is examined in wireless communications. The problem decides the location and capacity of each new base station to cover expanded and increased traffic demand. The objective is to minimize the cost of new base stations. The coverage by the new and existing base stations is constrained to satisfy a proper portion of traffic demands. The received signal power at the base station also has to meet the receiver sensitivity. The cell planning is formulated as an integer linear programming problem and solved by a tabu search algorithm. In the tabu search intensification by add and drop move is implemented by short-term memory embodied by two tabu lists. Diversification is designed to investigate proper capacities of new base stations and to restart the tabu search from new base station locations. Computational results show that the proposed tabu search is highly effective. A 10% cost reduction is obtained by the diversification strategies. The gap from the optimal solutions is approximately 1 ~ 5% in problems that can be handled in appropriate time limits. The proposed tabu search also outperforms the parallel genetic algorithm. The cost reduction by the tabu search approaches 10 ~ 20% in problems with 2500 traffic demand areas (TDAs) in code division multiple access (CDMA). Index Terms--AMPS, CDMA, cell planning, cellular communication systems, parallel genetic algorithm, tabu search.

Published
2000

199. Dynamic sectorization of microcells for balanced traffic in CDMA: genetic algorithms approach

Author

Taehoon Park, H.G. Kang, and Chae Y. Lee

Subjects
Engineering, Computer Networks and Communications, Wireless network, business.industry, Aerospace Engineering, Base transceiver station, Load balancing (computing), Handover, Automotive Engineering, Genetic algorithm, Cellular network, Microcell, Electrical and Electronic Engineering, business, Integer programming, Computer network
Abstract

With the increase of cellular users, traffic hot spots and unbalanced call distributions are common in wireless networks. As a solution to this problem, code-division multiple-access techniques enable a base transceiver station to connect microcells with optical fibers and to control the channels by sectorizing the microcells. To solve the load balancing among microcells, we dynamically sectorize the microcells depending on the time-varying traffic. The microcell sectorization problem is formulated as an integer linear programming that minimizes the blocked and handoff calls in the network. In the proposed sectorization, proper, connected, and compact sectors are considered to keep the handoffs as small as possible while satisfying the channel capacity at each sector. Three genetic algorithms (GAs) are proposed to solve the problem: standard GA, grouping GA, and parallel GA. Computational results show that the proposed GAs are highly effective. All three GAs illustrate outstanding performance for small size problems. The parallel GA, which is based on the operators used in grouping GA, demonstrates excellent solution quality in a reasonable time.

Published
2002

200. >23.1% High Efficiency Tunnel Oxide Junction Bifacial Solar Cell with Electroplated Cu Gridlines

Author

Heng, J.B., Fu, J., Kong, B., Chae, Y., Wang, W., Xie, Z., Reddy, A., Lam, K., Beitel, C., Liao, C., Erben, C., Huang, Z., and Xu, Z.

Subjects
WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY, Silicon Solar Cell Improvements
Abstract

29th European Photovoltaic Solar Energy Conference and Exhibition; 492-496, Triex® cell is a proprietary device structure based on Metal-Insulator-Semiconductor (MIS) concept which combines tunnel oxide junction with doped a-Si thin film emitter layers on n-type CZ silicon wafers. A single step patterning process combined with cost effective copper electrochemical plating (ECP) to form the electrodes. Greater than 23% high efficiency is achieved using Triex® solar cells, post optimizing key process areas to improve passivation, junction quality, emitter properties and shading effects. High open circuit voltage (Voc) 739mV and good fill factor (FF) 80.5% has been demonstrated on a 6inch solar cell. A champion 390W Triex® bifacial module is also validated under STC conditions. Extended cell and module reliability were studied in-depth and successfully tested to enable highly reliable Silevo products.

Published
2014
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