477 results on '"Kyung Ryu"'
Search Results
52. A Promising Key Agreement Protocol.
- Author
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Eun-Kyung Ryu, Kee-Won Kim, and Kee-Young Yoo
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- 2003
- Full Text
- View/download PDF
53. A New Authenticated Key Agreement Protocol.
- Author
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Kee-Won Kim, Eun-Kyung Ryu, Hyung-Mok Lee, and Kee-Young Yoo
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- 2003
54. Analysis of Factors Affecting Middle School Students’ Breakfast
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Ho Kyung Ryu and Ha Jin Park
- Published
- 2021
55. A Promising Labeling Scheme for On-the-fly Data Race Detection.
- Author
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Keum-Sook Ha, Eun-Kyung Ryu, and Kee-Young Yoo
- Published
- 2002
56. A New Collaborative Filtering Method Using Representative Attributes-neighborhood and Bayesian Estimated Value.
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Kyung-Yong Jung, Joong-Kyung Ryu, and Jung-Hyun Lee
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- 2002
57. Space-Efficient First Race Detection in Shared Memory Programs with Nested Parallelism.
- Author
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Keum-Sook Ha, Eun-Kyung Ryu, and Kee-Young Yoo
- Published
- 2002
- Full Text
- View/download PDF
58. A Practical Method for On-the-Fly Data Race Detection.
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Eun-Kyung Ryu, Keum-Sook Ha, and Kee-Young Yoo
- Published
- 2002
- Full Text
- View/download PDF
59. Allelic Variation at Loci Associated with Grain Properties in Korean Wheat Cultivars
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Na Kyung Ryu, Jung-Yoon Hwang, Kyeong-Min Kim, Kang Cheonsik, Seong-Woo Cho, Kyeong-Hoon Kim, Ji-Woo Kim, Ri Choe, and Chul Soo Park
- Subjects
Genetics ,Variation (linguistics) ,Cultivar ,Biology ,Allele - Published
- 2020
60. ASSOCIATION OF N-TERMINAL (NT)-PRO HORMONE BNP (NT-PROBNP) WITH AIRFLOW LIMITATION AND EXACERBATION IN COPD
- Author
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KIM HEY SOO, JI YE JUNG, HYEON KYEONG BAE, HYE RAN GWON, SOL KIM, EUN YOUNG KIM, WOO KYUNG RYU, EUN GI JUNG, HYUN WOO JI, KI-SUCK JUNG, KWANG HA YOO, CHIN KOO RHEE, and YONG BUM PARK
- Subjects
Pulmonary and Respiratory Medicine ,Cardiology and Cardiovascular Medicine ,Critical Care and Intensive Care Medicine - Published
- 2022
61. Differential manifestation of ocular phenotypes in TALEN-mediated p19arf knockout FVB/N and C57BL/6J mouse lines
- Author
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Joo Il Kim, Jin-Sung Park, Ki Taek Nam, Euna Kwon, Kang Min Han, Soo Kyung Ryu, Hyun Jin Lim, Han Woong Lee, and Byeong Cheol Kang
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0106 biological sciences ,0301 basic medicine ,Genetic heterogeneity ,Gene targeting ,Biology ,medicine.disease ,medicine.disease_cause ,01 natural sciences ,Biochemistry ,Molecular biology ,Phenotype ,law.invention ,03 medical and health sciences ,030104 developmental biology ,law ,Dysplasia ,Genetics ,medicine ,Suppressor ,Carcinogenesis ,Homologous recombination ,Molecular Biology ,Gene ,010606 plant biology & botany - Abstract
p19arf, primarily known as a tumor suppressor, has also been reported to play an essential role in normal development of mouse eyes. Consistently, lack of p19arf has been associated with ocular defects, but the mixed background of the knockout (KO) mouse strain used raised a concern on the accuracy of the phenotypes observed in association with the targeted gene due to genetic heterogeneity. We carried out a study to investigate into the effect of genetic background on the manifestation of p19arf KO associated phenotypes. We characterized the phenotypes of novel p19arf KO mouse lines generated in FVB/N and C57BL/6J using a transcription activator-like effector nuclease (TALEN) system in comparison to the reported phenotypes of three other p19arf-deficient mouse lines generated using homologous recombination. Ninety-five percent of FVB/N-p19arf KO mice showed ocular opacity from week 4 after birth which worsened rapidly until week 6, while such abnormality was absent in C57BL/6J-p19arf KO mice up to the age of 26 weeks. Histopathological analysis revealed retrolental masses and dysplasia in the retinal layer in FVB/N-p19arf KO mice from week 4. Besides these, both strains developed normally from birth to week 26 without increased tumorigenesis except for a subcutaneous tumor found in a C57BL/6J-p19arf KO mouse. Our findings demonstrated surprisingly variable manifestation of p19arf-linked phenotypes between FVB/N and C57BL/6J mice, and furthermore between our mouse lines and the established lines, indicating a critical impact of genetic background on functional study of genes using gene targeting strategies in mice.
- Published
- 2020
62. The Effects of Augmented Reality Based Language Intervention on Sentence Comprehension and Repetition of Patients with Aphasia
- Author
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Jaek-Kyung Ryu, Hee-June Park, and Kwon, Soonbok
- Subjects
Comprehension ,Repetition (rhetorical device) ,Wernicke's aphasia ,Aphasia ,medicine ,Augmented reality ,Language intervention ,medicine.symptom ,Psychology ,Broca's Aphasia ,Sentence ,Cognitive psychology - Published
- 2020
63. Condensin extrudes DNA loops in steps up to hundreds of base pairs that are generated by ATP binding events
- Author
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Jacob W. J. Kerssemakers, Sang-Hyun Rah, Richard Janissen, Je-Kyung Ryu, Davide Michieletto, Cees Dekker, and Andrea Bonato
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Magnetic tweezers ,Saccharomyces cerevisiae Proteins ,Base pair ,AcademicSubjects/SCI00010 ,Condensin ,Mutant ,Saccharomyces cerevisiae ,03 medical and health sciences ,Molecular dynamics ,chemistry.chemical_compound ,0302 clinical medicine ,Genetics ,DNA, Fungal ,030304 developmental biology ,Adenosine Triphosphatases ,0303 health sciences ,biology ,Chemistry ,SMC protein ,Gene regulation, Chromatin and Epigenetics ,Chromatin ,DNA-Binding Proteins ,Multiprotein Complexes ,Biophysics ,biology.protein ,Nucleic Acid Conformation ,Extrusion ,030217 neurology & neurosurgery ,DNA ,Protein Binding - Abstract
The condensin SMC protein complex organizes chromosomal structure by extruding loops of DNA. Its ATP-dependent motor mechanism remains unclear but likely involves steps associated with large conformational changes within the ∼50 nm protein complex. Here, using high-resolution magnetic tweezers, we resolve single steps in the loop extrusion process by individual yeast condensins. The measured median step sizes range between 20–40 nm at forces of 1.0–0.2 pN, respectively, comparable with the holocomplex size. These large steps show that, strikingly, condensin typically reels in DNA in very sizeable amounts with ∼200 bp on average per single extrusion step at low force, and occasionally even much larger, exceeding 500 bp per step. Using Molecular Dynamics simulations, we demonstrate that this is due to the structural flexibility of the DNA polymer at these low forces. Using ATP-binding-impaired and ATP-hydrolysis-deficient mutants, we find that ATP binding is the primary step-generating stage underlying DNA loop extrusion. We discuss our findings in terms of a scrunching model where a stepwise DNA loop extrusion is generated by an ATP-binding-induced engagement of the hinge and the globular domain of the SMC complex.
- Published
- 2022
64. Solitary Uncommon Metastasis in Non-Small Cell Lung Cancer
- Author
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Hyung Keun Cha, Jun Hyeok Lim, Woo Kyung Ryu, Lucia Kim, and Jeong-Seon Ryu
- Subjects
Electrical and Electronic Engineering ,Atomic and Molecular Physics, and Optics - Abstract
The major sites of metastasis in non-small cell lung cancer (NSCLC) are bones, the brain, adrenal glands, the liver, the contralateral lung, and distant lymph nodes. Solitary metastasis in an uncommon site is very rare; therefore, it has not often been reported. Identifying whether a solitary lesion is a metastatic lesion is important because it decisively influences the stage and treatment decisions. We report a series of cases of NSCLC diagnosis with uncommon solitary metastasis. (1) A 71-year-old man was diagnosed with poorly differentiated NSCLC after a bronchoscopic biopsy of a tumor in the bronchus of the right middle lobe. A hypermetabolic lesion was observed in the tail of the pancreas using positron emission tomography/computed tomography (PET/CT), and metastasis of NSCLC was confirmed using endoscopic ultrasound fine-needle aspiration (EUS-FNA). (2) A 77-year-old man was diagnosed with squamous cell carcinoma after a bronchoscopic biopsy of a tumor in the bronchus of the left upper lobe. A hypermetabolic lesion was observed in the bilateral lobes of the thyroid gland using PET/CT, and metastasis of the squamous cell carcinoma was confirmed by FNA and cytology. (3) A 79-year-old woman was diagnosed with adenocarcinoma by brushing cytology performed on the apicoposterior segmental bronchus of the left upper lobe. Hypermetabolic lesions were observed using PET/CT in the subcutaneous layer of the right back and the left breast, and metastases of adenocarcinoma were confirmed by biopsies in each lesion. These three patients were treated with platinum-based chemotherapy for stage IV lung cancer. With this case series, we recommend that, when a solitary lesion is observed in NSCLC patients, a tissue biopsy should be performed, even if the lesion is located in an organ where lung cancer metastasis is uncommon.
- Published
- 2023
65. Subamniotic Hemorrhage Associated with Preterm Birth
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Myeong Gyun Choi, Jong Woon Kim, Hyun Kyung Ryu, Tae Young Kim, Seo Young Park, Hee Young Bang, In Yeong Jo, Eun Byeol Jo, and Yoon Ha Kim
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General Medicine - Published
- 2023
66. Development and Validation of a Career Future Time Perspective Scale
- Author
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Kyueun Han, Kyung Ryu, and In-Jo Park
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Time perspective ,Organizational Behavior and Human Resource Management ,05 social sciences ,050109 social psychology ,Education ,Domain (software engineering) ,Scale (social sciences) ,0502 economics and business ,0501 psychology and cognitive sciences ,Engineering ethics ,Career decision ,Psychology ,050203 business & management ,General Psychology ,Applied Psychology - Abstract
Future time perspective, like self-efficacy, can be understood both generally and domain specifically. Keeping this in mind, the current study aimed at developing and validating a Career Future Time Perspective Scale. In Study 1, we utilized an exploratory factor analysis and the Rasch rating model to ensure the construct validity of a Career Future Time Perspective Scale. The scale consisted of three factors—opportunity, value, and connectedness—across 9 items. In Study 2, we showed that this three-factor oblique scale was the most representative structure of career future time perspective. Study 3 demonstrated that after controlling for the future time perspective measures posited by Shell and Husman and Carstensen and Lang, this scale could also be used to explain: (a) career decision-making self-efficacy, (b) career-indecision tendencies, and (c) career-searching behavior. In Study 4, the reliability of the scale was demonstrated.
- Published
- 2019
67. A Preliminary Study on the Prognostic Impact of Neutrophil to Lymphocyte Ratio of the Bronchoalveolar Lavage Fluid in Patients with Lung Cancer
- Author
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Woo Kyung Ryu, Mi Hwa Park, Seung Min Kwak, Jun Hyeok Lim, Young Sam Kim, Yeonsook Moon, Chang-Hwan Kim, Hae-Seong Nam, and Kyung Hee Lee
- Subjects
Poor prognosis ,medicine.medical_specialty ,Prognostic factor ,Medicine (General) ,medicine.diagnostic_test ,bronchoalveolar lavage ,neutrophil to lymphocyte ratio ,peripheral blood ,prognostic factor ,business.industry ,Clinical Biochemistry ,medicine.disease ,Gastroenterology ,Article ,Peripheral blood ,Bronchoalveolar lavage ,R5-920 ,Internal medicine ,medicine ,In patient ,Stage (cooking) ,Neutrophil to lymphocyte ratio ,Lung cancer ,business - Abstract
The cumulative results indicate that the neutrophil to lymphocyte ratio of peripheral blood (pbNLR) is a useful prognostic factor in patients with various cancers. In contrast to peripheral blood, the bronchoalveolar lavage (BAL) fluid is in direct contact with the lung lesion. However, no study has reported on the clinical utility of the NLR of BAL fluid (bNLR) for patients with lung cancer. To investigate the clinical utility of the bNLR as a prognostic factor in patients with lung cancer, we conducted a retrospective review of the prospectively collected data. A total of 45 patients were classified into high bNLR (n = 29) and low bNLR (n = 16) groups. A high pbNLR and high bNLR were associated with a shorter overall survival (p < 0.001 and p = 0.011, respectively). A multivariable analysis confirmed that ECOG PS (p = 0.023), M stage (p = 0.035), pbNLR (p = 0.008), and bNLR (p = 0.0160) were independent predictors of overall survival. Similar to the pbNLR, a high bNLR value was associated with a poor prognosis in patients with lung cancer. Although further studies are required to apply our results clinically, this is the first study to show the clinical value of the bNLR in patients with lung cancer.
- Published
- 2021
68. CARDIOVASCULAR AND CEREBROVASCULAR MORTALITY IN PATIENTS WITH PRECEDING BRONCHIECTASIS EXACERBATION
- Author
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HYEON KYEONG BAE, HEY SOO KIM, EUN YOUNG KIM, EUNKI CHUNG, HYUN WOO JI, WOO KYUNG RYU, HYE RAN GWON, SOL KIM, SANG CHUL LEE, KANG JU SON, CHANG HOON HAN, SEON CHEOL PARK, and JI YE JUNG
- Subjects
Pulmonary and Respiratory Medicine ,Cardiology and Cardiovascular Medicine ,Critical Care and Intensive Care Medicine - Published
- 2022
69. BLASTOCYST WITH MORPHOKINETIC ABNORMALITIES CAN BE A VIABLE OPTION FOR EMBRYO TRANSFER
- Author
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eun Kyung Ryu, Seunghyeon Song, Kevin DW. Kang, Jiyeon Yun, Hanna Lee, YongSoo Hur, Kyung Sil Lim, and Won-Don Lee
- Subjects
Reproductive Medicine ,Obstetrics and Gynecology - Published
- 2022
70. SMC complexes can traverse physical roadblocks bigger than their ring size
- Author
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Cees Dekker, Biswajit Pradhan, Je-Kyung Ryu, Jan-Michael Peters, Benedikt Bauer, Iain F. Davidson, Wayne Yang, Eugene Kim, Theo van Laar, Roman Barth, and Jaco van der Torre
- Subjects
History ,topology ,Polymers and Plastics ,Condensin ,cohesin ,mechanism ,Cell Cycle Proteins ,Saccharomyces cerevisiae ,DNA loop extrusion ,General Biochemistry, Genetics and Molecular Biology ,Industrial and Manufacturing Engineering ,dCas9 ,Motor protein ,roadblocks ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,RNA polymerase ,Nucleosome ,Business and International Management ,030304 developmental biology ,0303 health sciences ,Cohesin ,biology ,SMC ,Chemistry ,condensin ,Chromatin ,Ring size ,nucleosomes ,Biophysics ,biology.protein ,Nanoparticles ,CP: Molecular biology ,030217 neurology & neurosurgery ,DNA - Abstract
The ring-shaped structural-maintenance-of-chromosomes (SMC) complexes condensin and cohesin extrude loops of DNA as a key motif in chromosome organization. It remains, how ever, unclear how these SMC motor proteins can extrude DNA loops in chromatin that is bound with proteins. Here, using in vitro single-molecule visualization, we show that nucleosomes, RNA polymerase, and dCas9 pose virtually no barrier to DNA loop extrusion by yeast condensin. Strikingly, we find that even DNA-bound nanoparticles as large as 200 nm, much bigger than the SMC ring size, can be translocated into DNA loops during condensin-driven extrusion. Similarly, human cohesin can pass 200 nm particles during loop extrusion, which even occurs for a single-chain version of cohesin in which the ring-forming subunits are covalently linked and cannot open up to entrap DNA. These findings disqualify all common loop-extrusion models where DNA passes through the SMC rings (pseudo)topologically, and instead point to a nontopological mechanism for DNA loop extrusion.One-sentence summaryHuge DNA-bound roadblocks can be incorporated into SMC-extruded DNA loops, pointing to a nontopological mechanism for loop extrusion.
- Published
- 2021
71. Statistical Estimation of Forest Fire Precaution Periods
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Byung Doo Lee, Hee Young Ahn, Sung Yong Kim, and Sun Kyung Ryu
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Estimation ,Geography ,Lasso regression ,Statistical analysis ,Forestry ,General Medicine ,Disease cluster ,Limited resources ,Statistical evidence ,Linear trend - Abstract
In order to maximize the efficiency of the limited resources for fire-fighting and prevention, it is important to set a forest fire precaution period by considering the temporal characteristics of forest fire occurrence and spread. In this study, the forest fire precaution periods were suggested based on statistical analysis of the national fire statistics data from 1991 to 2018. Multiple, ridge, and Lasso regression analyses were applied to identify the monthly (or 10 days) linear trend of fire occurrences, while k-means cluster analysis was used to select the precaution period. The fire occurrences in January, June, August and November have increased significantly over time, whilst those in March, April and May remained high without fluctuation over this period. The results suggest the extension of the fire precaution period in South Korea from 5 months (Spring: February 1 to May 15, Autumn: November 1 to December 15) to 8 months from mid-October to mid-June. This results from this study are expected to serve as statistical evidence for readjustment of forest fire precaution period in South Korea.
- Published
- 2019
72. A Study on the Miniaturization of a Protective Device for the Micro Smart Grid Simulator
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Hyuk‑Sik Yoon, Min‑Soo Oh, Yun‑Seok Ko, and Kyung Ryu
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Microelectromechanical systems ,Computer science ,020209 energy ,02 engineering and technology ,Smart grid ,Recloser ,0202 electrical engineering, electronic engineering, information engineering ,Miniaturization ,Key (cryptography) ,Electrical and Electronic Engineering ,Scenario testing ,Circuit breaker ,Simulation ,Voltage - Abstract
In this paper, a miniaturization methodology of protective devices (PDs) was proposed which plays a key role in evaluating the effectiveness of the developed protection and control algorithms in the micro smart grid simulator. The micro PD was designed to have the rated voltage of 19 V and the breaking current of 20 A, and was designed in a multi-layered hardware structure to satisfy the size of 13 × 13 cm2. Also, the micro PD was designed in a multifunctional structure to allow one micro PD to perform all the functions of the circuit breaker, recloser and switches on the micro smart grid simulator to enhance the efficiency of development. Finally, it was verified that the developed micro PD can be applied as protective devices of the micro smart grid simulator by showing that it operates correctly according to the predetermined operation sequence for the test scenarios on the built test system.
- Published
- 2019
73. 기내식이 기내 서비스 만족, 항공사 이미지, 가격 민감도 및 재이용 의도에 미치는 영향
- Author
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박진우 ( Jin-woo Park ), 이상학 ( Sanghak Lee ), and 류영경 ( Young Kyung Ryu )
- Abstract
항공여객시장은 지속적인 성장을 하고 있으며 특히 대형항공사와 저비용항공사의 경쟁이 날로 격화되어가고 있다. 이러한 시점에서 대형항공사는 저비용항공사에 대한 차별적 경쟁우위를 유지하고 강화하는 것이 특히 중요하다. 기내식은 저비용항공사와 비교하였을 때 대형항공사의 차별적 경쟁우위의 요소가 될 수 있어 이에 대한 연구가 필요하다. 이에 본 연구는 기내식 품질과 만족에 영향을 미치는 요소가 무엇인지, 그리고 기내식이 기내 서비스, 항공사 이미지, 가격 민감도 및 재이용 의도에 미치는 영향관계를 실증적으로 분석하고자 한다. 본 연구에서는 항공사 이용 경험이 있는 고객을 대상으로 설문지 318부를 통해 자료를 수집하였으며 구조모형방정식을 통하여 변수간의 관계를 분석하였다. 분석 결과, 승무원 서비스 환경이 기내식 품질 인식에 영향을 미쳤으며, 기내식 만족은 기내 서비스 만족과 항공사 이미지 향상에 영향을 미쳤다. 또 이는 가격민감도를 완화하고 재이용 의도를 증가시키는 것으로 나타났다. 즉, 대형항공사는 양질의 기내식 제공으로 항공사 서비스와 이미지를 개선할 수 있으며 이를 통해 저비용항공사와 비교되는 항공권 가격에 대한 민감도를 완화할 수 있으며 계속적인 이용을 유도할 수 있다는 실무적 시사점을 발견하였다.
- Published
- 2019
74. Monitoring Circulating Tumor DNA in Untreated Non-Small-Cell Lung Cancer Patients
- Author
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Woo Kyung Ryu, Sekyung Oh, Jun Hyeok Lim, Seung Jae Lee, Hyun-Tae Shin, and Jeong-Seon Ryu
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Lung Neoplasms ,non-small-cell lung cancer ,circulating tumor DNA ,monitoring ,Organic Chemistry ,General Medicine ,Catalysis ,Circulating Tumor DNA ,Tumor Burden ,Computer Science Applications ,Inorganic Chemistry ,Carcinoma, Non-Small-Cell Lung ,Mutation ,Biomarkers, Tumor ,Humans ,Physical and Theoretical Chemistry ,Molecular Biology ,Spectroscopy - Abstract
Circulating tumor DNA (ctDNA) has been utilized to monitor the clinical course of patients of non-small-cell lung cancer (NSCLC) who receive therapies targeting druggable mutations. However, despite providing valuable information on how NSCLC would naturally progress, the clinical utility of ctDNA for clinical-course monitoring and prediction of treatment-naïve NSCLC patients without druggable mutations remain unknown. We longitudinally followed a total of 12 treatment-naïve NSCLC patients, who did not harbor EGFR and ALK mutations, by collecting clinical information, radiological data, and plasma samples. Changes in ctDNA levels and tumor burden (TB) were compared with each other. New metastasis development, volume doubling time (VDT), and overall survival (OS) were analyzed regarding ctDNA detection at diagnosis. ctDNA was detected in the plasma of seven (58.3%) patients. Changes in ctDNA levels correlated with those in TB in a substantial fraction (57.1%) of patients and was also associated with brain metastasis, tumor necrosis, or pneumonia in other patients. All patients with ctDNA detection developed new metastasis during follow-ups in the organs that had been devoid of metastasis at diagnosis. The patients without ctDNA detection did not develop new metastasis (median duration of follow-ups: 9.8 months). In addition, patients with ctDNA detection had shorter VDT (p = 0.039) and worse OS (p = 0.019) than those without ctDNA detection. The natural course of NSCLC progression can be monitored by measuring ctDNA levels. Detection of ctDNA at diagnosis can predict development of new metastasis, rapid tumor growth and poor survival of NSCLC patients.
- Published
- 2022
75. CRISPR/Cas9-mediated knockout of Rag-2 causes systemic lymphopenia with hypoplastic lymphoid organs in FVB mice
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Jin-Sung Park, Joo-Il Kim, Euna Kwon, Soo-Kyung Ryu, Han Woong Lee, Jina Kwak, Byeong-Cheol Kang, Ki Taek Nam, Jun-Won Yun, and Hanna Kim
- Subjects
0301 basic medicine ,Pathology ,medicine.medical_specialty ,Spleen ,03 medical and health sciences ,thymic atrophy ,medicine ,CRISPR/Cas9 ,lcsh:QH301-705.5 ,Immunodeficiency ,Severe combined immunodeficiency ,lcsh:R5-920 ,biology ,T-cell receptor ,hemic and immune systems ,splenic atrophy ,Rag-2 ,medicine.disease ,030104 developmental biology ,medicine.anatomical_structure ,Lymphatic system ,lcsh:Biology (General) ,Knockout mouse ,biology.protein ,histopathology ,Original Article ,Bone marrow ,Antibody ,lcsh:Medicine (General) ,immunodeficiency - Abstract
Recombination activating gene-2 (RAG-2) plays a crucial role in the development of lymphocytes by mediating recombination of T cell receptors and immunoglobulins, and loss of RAG-2 causes severe combined immunodeficiency (SCID) in humans. Rag-2 knockout mice created using homologous recombination in ES cells have served as a valuable immunodeficient platform, but concerns have persisted on the specificity of Rag-2-related phenotypes in these animals due to the limitations associated with the genome engineering method used. To precisely investigate the function of Rag-2, we recently established a new Rag-2 knockout FVB mouse line (Rag-2-/-) manifesting lymphopenia by employing a CRISPR/Cas9 system at Center for Mouse Models of Human Disease. In this study, we further characterized their phenotypes focusing on histopathological analysis of lymphoid organs. Rag-2-/- mice showed no abnormality in development compared to their WT littermates for 26 weeks. At necropsy, gross examination revealed significantly smaller spleens and thymuses in Rag-2-/- mice, while histopathological investigation revealed hypoplastic white pulps with intact red pulps in the spleen, severe atrophy of the thymic cortex and disappearance of follicles in lymph nodes. However, no perceivable change was observed in the bone marrow. Moreover, our analyses showed a specific reduction of lymphocytes with a complete loss of mature T cells and B cells in the lymphoid organs, while natural killer cells and splenic megakaryocytes were increased in Rag-2-/- mice. These findings indicate that our Rag-2-/- mice show systemic lymphopenia with the relevant histopathological changes in the lymphoid organs, suggesting them as an improved Rag-2-related immunodeficient model.
- Published
- 2018
76. Hyperoxia-Induced ΔR 1
- Author
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Ji-Yeon Suh, Yoon-Seok Choi, Young-Kyu Song, Bum Woo Park, Jeong Kon Kim, Eun Kyung Ryu, Gyunggoo Cho, Young Ro Kim, Woo Hyun Shim, and Dong-Cheol Woo
- Subjects
medicine.medical_specialty ,chemistry.chemical_element ,Infarction ,Blood volume ,Oxygen ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,Medicine ,Effective diffusion coefficient ,Stroke ,Advanced and Specialized Nursing ,Hyperoxia ,medicine.diagnostic_test ,business.industry ,Magnetic resonance imaging ,medicine.disease ,chemistry ,Positron emission tomography ,Cardiology ,Neurology (clinical) ,medicine.symptom ,Cardiology and Cardiovascular Medicine ,business ,030217 neurology & neurosurgery - Abstract
Background and Purpose— Acceleration of longitudinal relaxation under hyperoxic challenge (ie, hyperoxia-induced ΔR 1 ) indicates oxygen accumulation and reflects baseline tissue oxygenation. We evaluated the feasibility of hyperoxia-induced ΔR 1 for evaluating cerebral oxygenation status and degree of ischemic damage in stroke. Methods— In 24-hour transient stroke rat models (n=13), hyperoxia-induced ΔR 1 , ischemic severity (apparent diffusion coefficient [ADC]), vasogenic edema (R 2 ), total and microvascular blood volume (superparamagnetic iron oxide-driven ΔR 2 * and ΔR 2 , respectively), and glucose metabolism activity ( 18 F-fluorodeoxyglucose uptake on positron emission tomography) were measured. The distribution of these parameters according to hyperoxia-induced ΔR 1 was analyzed. The partial pressure of tissue oxygen change during hyperoxic challenge was measured using fiberoptic tissue oximetry. In 4-hour stroke models (n=6), ADC and hyperoxia-induced ΔR 1 was analyzed with 2,3,5-triphenyltetrazolium chloride staining being a criterion of infarction. Results— Ischemic hemisphere showed significantly higher hyperoxia-induced ΔR 1 than nonischemic brain in a pattern depending on ADC. During hyperoxic challenge, ischemic hemisphere demonstrated uncontrolled increase of partial pressure of tissue oxygen, whereas contralateral hemisphere rapidly plateaued. Ischemic hemisphere also demonstrated significant correlation between hyperoxia-induced ΔR 1 and R 2 . Hyperoxia-induced ΔR 1 showed a significant negative correlation with 18 F-fluorodeoxyglucose uptake. The ADC, R 2 , ΔR 2 , and 18 F-fluorodeoxyglucose uptake showed a dichotomized distribution according to the hyperoxia-induced ΔR 1 as their slopes and values were higher at low hyperoxia-induced ΔR 1 (−1 ) than at high ΔR 1 . In 4-hour stroke rats, the distribution of ADC according to the hyperoxia-induced ΔR 1 was similar with 24-hour stroke rats. The hyperoxia-induced ΔR 1 was greater in the infarct area (47±10 ms −1 ) than in peri-infarct area (16±4 ms −1 ; P Conclusions— Hyperoxia-induced ΔR 1 adequately indicates cerebral oxygenation and can be a feasible biomarker to classify the degree of ischemia-induced damage in neurovascular function and metabolism in stroke brain.
- Published
- 2018
77. Design of Portable Healthcare Gateway for Patient with Chronic Disease.
- Author
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Hee-Jun Pan, Jong-Hun Kim, Kyung-Yong Chung, and Joong-Kyung Ryu
- Published
- 2013
- Full Text
- View/download PDF
78. Food-borne outbreak of Listeria monocytogenes in school students in Seoul, Korea
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Chae-Kyu Hong, Sung-Sun Choi, Young-Hee Jin, So-Yun Park, So-Hyun Park, Ah-Ryung Oh, Jib Ho Lee, Sang-Hun Park, Younghee Oh, Joo-Hyun Park, Yun-Jung Kim, Jin-Seok Kim Kim, Sujin Jeon, Hee-Soon Kim, Minji Kang, Jin Kyung Ryu, and Sung-Hee Han
- Subjects
Listeria monocytogenes ,Pulsed-field gel electrophoresis ,medicine ,Retrospective cohort study ,Biology ,Food borne outbreak ,medicine.disease_cause ,Microbiology ,Virulence associated genes - Abstract
In September 2018, an outbreak of Listeriosis cases in Korea was traced to food involved, using retrospective cohort studies and PFGE analyses. This study aimed to describe the first L.monocytogenes outbreak identified in Korea. We confirmed the presence of Serovar (4C) and virulence genes, and evaluated the genetic correlation between isolates by restriction digestion patterns of ApaI and AscI. Based on the epidemiological association, it is presumed that the seasoned crab meat with bean sprouts are contaminated by cross contamination during the bean sprouts washing (relative risk was 1.24; p-value: 0.0021 and they possessed virulence genes. Therefore, active laboratory surveillance is necessary to recognize the risk of L. monocytogenes in Korea.
- Published
- 2021
79. Corrective surgery using a gridiron incision for abdominal pain caused by a folded ovary in the third trimester of pregnancy
- Author
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Yoon Ha Kim, Hyun Kyung Ryu, A Mi Kim, Myeong Gyun Choi, Jong Woon Kim, and Tae Young Kim
- Subjects
Male ,Torsion Abnormality ,medicine.medical_specialty ,Abdominal pain ,Medicine (General) ,Adolescent ,Pregnancy Trimester, Third ,Case Report ,Ovary ,Corrective surgery ,Third trimester ,Biochemistry ,03 medical and health sciences ,0302 clinical medicine ,R5-920 ,Pregnancy ,medicine ,Humans ,gridiron incision ,030212 general & internal medicine ,third trimester ,030219 obstetrics & reproductive medicine ,medicine.diagnostic_test ,business.industry ,Biochemistry (medical) ,abdominal pain ,imaging ,Magnetic resonance imaging ,Cell Biology ,General Medicine ,medicine.disease ,Surgery ,Folded ovary ,Pregnancy Complications ,Gridiron incision ,medicine.anatomical_structure ,Adnexal torsion ,Female ,medicine.symptom ,business - Abstract
Introduction Sonography and magnetic resonance imaging (MRI) may be helpful to obtain an accurate diagnosis of acute abdominal pain in pregnancy. Adnexal torsion presenting in the first or second trimester can be confirmed and treated through laparoscopic surgery; however laparoscopic surgery in the third trimester can be difficult owing to the large uterus, and a gridiron incision can be useful. Case Report/Case presentation An 18-year-old gravida 1, para 0 (G1P0) woman at 30 + 4 weeks of gestation presented with sudden-onset cyclic pain in the right lower quadrant. Abdominal ultrasonography showed a normal appendix, and MRI showed a normal appendix and normal ovaries. The patient’s prominent tender point was marked and compared with the MR images, which confirmed the mark as the position of the right ovary. Laparotomy was performed through a gridiron incision, and a folded right ovary was identified. The ovary was unfolded, and TachoSil® and Surgicel® were used to maintain the unfolded position. The patient’s pain resolved, and her postoperative course was uneventful. She delivered a healthy, 2540-g male baby at 35 weeks’ gestation. Discussion/Conclusions A gridiron incision was useful to treat a folded ovary in the third trimester and to evaluate the adnexa and minimize uterine manipulation.
- Published
- 2021
80. Bridging-induced phase separation induced by cohesin SMC protein complexes
- Author
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Allard J. Katan, Davide Marenduzzo, Frank Uhlmann, Céline Bouchoux, Davide Michieletto, Ralph de Groot, Je-Kyung Ryu, Andrea Bonato, Eugene Kim, Hon Wing Liu, Masashi Minamino, and Cees Dekker
- Subjects
Chromosomal Proteins, Non-Histone ,Biophysics ,Cell Cycle Proteins ,Saccharomyces cerevisiae ,Chromosomes ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Research Articles ,030304 developmental biology ,Genomic organization ,0303 health sciences ,Multidisciplinary ,Cohesin ,SMC protein ,SciAdv r-articles ,Life Sciences ,Chromosome ,Fluorescence recovery after photobleaching ,DNA ,eye diseases ,Yeast ,3. Good health ,Chromatin ,chemistry ,biological phenomena, cell phenomena, and immunity ,030217 neurology & neurosurgery ,Research Article - Abstract
Yeast cohesin complexes cluster onto long DNA into liquid droplets, which they accomplish by ATP-independent DNA bridging., Structural maintenance of chromosome (SMC) protein complexes are able to extrude DNA loops. While loop extrusion constitutes a fundamental building block of chromosomes, other factors may be equally important. Here, we show that yeast cohesin exhibits pronounced clustering on DNA, with all the hallmarks of biomolecular condensation. DNA-cohesin clusters exhibit liquid-like behavior, showing fusion of clusters, rapid fluorescence recovery after photobleaching and exchange of cohesin with the environment. Strikingly, the in vitro clustering is DNA length dependent, as cohesin forms clusters only on DNA exceeding 3 kilo–base pairs. We discuss how bridging-induced phase separation, a previously unobserved type of biological condensation, can explain the DNA-cohesin clustering through DNA-cohesin-DNA bridges. We confirm that, in yeast cells in vivo, a fraction of cohesin associates with chromatin in a manner consistent with bridging-induced phase separation. Biomolecular condensation by SMC proteins constitutes a new basic principle by which SMC complexes direct genome organization.
- Published
- 2021
81. Simultaneously performed combined 24-2 and 10-2 visual field tests in glaucoma
- Author
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Yong Chan Kim, Ki Hoon Hong, Hee Kyung Ryu, Kyoung In Jung, and Chan Kee Park
- Subjects
0301 basic medicine ,Male ,Retinal Ganglion Cells ,medicine.medical_specialty ,genetic structures ,Science ,Optic Disk ,Nerve fiber layer ,Vision Disorders ,Visual Acuity ,Glaucoma ,Article ,Retina ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Nerve Fibers ,Ophthalmology ,Paracentral scotoma ,medicine ,Humans ,Scotoma ,Eye diseases ,Multidisciplinary ,business.industry ,Blind spot ,Retinal ,Middle Aged ,medicine.disease ,Ganglion ,Visual field ,030104 developmental biology ,medicine.anatomical_structure ,Cross-Sectional Studies ,chemistry ,Y-Coordinate ,030221 ophthalmology & optometry ,Optic nerve diseases ,Medicine ,Visual Field Tests ,Female ,Visual Fields ,business ,Tomography, Optical Coherence - Abstract
Using either 24-2 or 10-2 visual field (VF) testing only is not enough to cover all the various types of glaucomatous VF defects. We investigated the performance of the combined 24-2 and 10-2 perimetry when conducted together and separately using the structure–function relationship. A total of 30 glaucoma patients with isolated peripheral nasal step, 37 patients with isolated paracentral scotoma, and 38 patients with both paracentral and nasal scotoma were included. To create the combined Humphrey VF test, a custom test pattern was established using the built-in custom point options, an example of the X, Y coordinate system. In glaucoma patients with peripheral nasal step, the superotemporal topographic structure–function relationship with peripapillary retinal nerve fiber layer (RNFL) thickness was superior in relation to the combined or 24-2 perimetry relative to the 10-2 perimetry (both P
- Published
- 2021
82. Phase separation induced by cohesin SMC protein complexes
- Author
-
Hon Wing Liu, Davide Michieletto, Cees Dekker, Davide Marenduzzo, Masashi Minamino, Ralph de Groot, Andrea Bonato, Allard J. Katan, Je-Kyung Ryu, Eugene Kim, Frank Uhlmann, and Céline Bouchoux
- Subjects
chemistry.chemical_compound ,Cohesin ,chemistry ,Cohesin complex ,Phase (matter) ,SMC protein ,Biophysics ,Interphase ,biological phenomena, cell phenomena, and immunity ,DNA ,Genomic organization ,Chromatin - Abstract
Cohesin is a key protein complex that organizes the spatial structure of chromosomes during interphase. Here, we show that yeast cohesin shows pronounced clustering on DNA in an ATP-independent manner, exhibiting all the hallmarks of phase separation. In vitro visualization of cohesin on DNA shows DNA-cohesin clusters that exhibit liquid-like behavior. This includes mutual fusion and reversible dissociation upon depleting the cohesin concentration, increasing the ionic strength, or adding 1,6-hexanediol, conditions that disrupt weak interactions. We discuss how bridging-induced phase separation can explain the DNA-cohesin clustering through DNA-cohesin-DNA bridges. We confirm that, in vivo, a fraction of cohesin associates with chromatin in yeast cells in a manner consistent with phase separation. Our findings establish that SMC proteins can exhibit phase separation, which has potential to clarify previously unexplained aspects of in vivo SMC behavior and constitute an additional principle by which SMC complexes impact genome organization.One sentence summaryYeast cohesin complex is observed to phase separate with DNA into liquid droplets, which it accomplishes by ATP-independent DNA bridging.
- Published
- 2020
83. Differential manifestation of ocular phenotypes in TALEN-mediated p19
- Author
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Jin-Sung, Park, Joo-Il, Kim, Hyun-Jin, Lim, Soo-Kyung, Ryu, Euna, Kwon, Kang-Min, Han, Ki-Taek, Nam, Han-Woong, Lee, and Byeong-Cheol, Kang
- Subjects
Male ,Mice, Knockout ,Mice, Inbred Strains ,Eye ,Mice, Inbred C57BL ,Mice ,Phenotype ,Transcription Activator-Like Effector Nucleases ,Animals ,Female ,Ocular Physiological Phenomena ,Cyclin-Dependent Kinase Inhibitor p16 ,Transcription Activator-Like Effectors ,Vision, Ocular - Abstract
p19We carried out a study to investigate into the effect of genetic background on the manifestation of p19We characterized the phenotypes of novel p19Ninety-five percent of FVB/N-p19Our findings demonstrated surprisingly variable manifestation of p19
- Published
- 2020
84. An Energy Storage System’s Operational Management and Control Method Considering a Battery System
- Author
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Chung-Yuen Won, Jun-Mo Kim, Jeong Lee, and Kyung Ryu
- Subjects
Battery (electricity) ,Computer Networks and Communications ,State of health ,Computer science ,power conversion system (pcs) ,lcsh:TK7800-8360 ,02 engineering and technology ,Internal resistance ,Automotive engineering ,Energy storage ,Hardware_GENERAL ,Thermal ,0202 electrical engineering, electronic engineering, information engineering ,state of health (soh) ,Temperature difference ,Electrical and Electronic Engineering ,020208 electrical & electronic engineering ,lcsh:Electronics ,020206 networking & telecommunications ,energy storage system (ess) ,Power (physics) ,State of charge ,Hardware and Architecture ,Control and Systems Engineering ,Signal Processing ,state of charge (soc) ,Constant current ,Voltage - Abstract
Losses in energy storage systems (ESSs) result from losses in battery systems and power conversion systems (PCSs). Thus, the power difference between the input and output occurs as a loss, which is considered an operational cost. Additionally, since battery systems consist of modules, there is always a temperature difference. Even if voltage balancing is conducted, deviations between the state of health (SoH) and state of charge (SoC) always exist. Therefore, a battery characteristic should be considered in relation to the efficient operation of an ESS. In this paper, charging control is implemented based on the SoC. When errors occur in the beginning, the coulomb counting method (CCM) continues to produce errors, it also calculates the SoC through an improved equation. Thus, it can calculate the SoC by using high-accuracy initial values. Moreover, battery deterioration occurs during charging and discharging, which increases a battery&rsquo, s internal resistance. This reduces the switching time to the battery cut-off voltage or constant voltage (CV) mode, so it becomes possible to calculate the SoH. Therefore, in this paper, the algorithms and equations are proposed to perform SoH operations according to the charging time that is able to reach CV after charging. A conventional battery is usually charged by using constant current (CC) charging until the voltage of the battery module reaches the cut-off area. A switch to CV then occurs when the cut-off area is reached and maintained. However, SoC-based selective charging control is carried out to prevent heat problems. In addition, the battery is charged safely and efficiently by conducting SoH prediction considering the battery thermal characteristics, which vary depending on the charging time and other characteristics. In this paper, a 3 kW ESS was produced, and the proposed algorithm&rsquo, s feasibility was verified.
- Published
- 2020
85. Resolving the Step Size in Condensin-Driven DNA Loop Extrusion Identifies ATP Binding as the Step-Generating Process
- Author
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Cees Dekker, Je-Kyung Ryu, Jacob W. J. Kerssemakers, Richard Janissen, and Sang-Hyun Rah
- Subjects
Loop (topology) ,Magnetic tweezers ,chemistry.chemical_compound ,biology ,Chemistry ,Condensin ,SMC protein ,Mutant ,Molecular motor ,biology.protein ,Biophysics ,Extrusion ,DNA - Abstract
The condensin SMC protein complex organizes chromosomal structure by extruding loops of DNA. Its ATP-dependent motor mechanism remains unclear but likely involves steps associated with large conformational changes within the ~50 nm protein complex. Here, using magnetic tweezers, we resolve single steps in loop extrusion by individual yeast condensins. Step sizes range between 20-45 nm at forces of 1.0-0.2 pN, respectively, comparable to the complex size. The large steps show that condensin reels in DNA in very sizeable amounts, up to ~600 bp per extrusion step, consistent with the non-stretched DNA polymer at these low forces. Using ATP-binding-impaired and ATP-hydrolysis-deficient mutants, we find that ATP binding is the primary step-generating stage underlying DNA loop extrusion. We discuss the findings in terms of a scrunching model where a stepwise DNA loop extrusion is generated by an ATP-binding-induced engagement of the hinge and the globular domain of the SMC complex.
- Published
- 2020
86. Status of Iodine Intake and Comparison of Characteristics according to Iodine-sourced Food Intake Patterns of Chinese Adults: A Study Encompassing Three Regions with Different Iodine Nutritional Statuses
- Author
-
Danying Zhang and Ho Kyung Ryu
- Subjects
General Medicine - Published
- 2022
87. Association between drinking behaviors and components of metabolic syndrome in subjects in their 20s and 30s: data obtained from the Korea National Health and Nutrition Examination Survey (2016–2018)
- Author
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Ho Kyung Ryu and Soo Jin Lee
- Subjects
Nutrition and Dietetics ,Food Science - Abstract
Numerous studies have examined the relationship between drinking behaviors and metabolic syndrome (MetS) for adults, but these include very few studies for young adults. This study therefore undertook to investigate the association between drinking behaviors and components of MetS among adult drinkers aged 20-30 years.Using the 2016-2018 Korea National Health and Nutrition Examination Survey data, drinking behaviors of adults in the age group 20-30 years were divided into 4 groups: 1) group A, good drinking habits; 2) group B, frequent binge drinking but not frequent drinking; 3) group C, frequent drinking but not frequent binge drinking; 4) group D, frequent drinking and binge drinking. The association between MetS components and drinking behaviors was analyzed by applying multiple logistic regression analysis.We determined the prevalence risk compared to group A. In men, the prevalence risk of high triglyceride (TG) increased 2.051-fold in group C and 1.965-fold in group D. Moreover, in group D, the prevalence risk of low high density lipoprotein cholesterol (HDL-C) increased 0.668-fold, high blood pressure (BP) increased 2.147-fold, and MetS increased 1.567-fold. In women, there was an increased prevalence risk of low HDL-C (0.353-fold) and MetS (3.438-fold) in group C, whereas group D showed increased prevalence risk of abdominal obesity (2.959-fold), high TG (1.824-fold, and low HDL-C (0.424-fold).Our study indicates that frequent drinking increases the risk of high TG, whereas frequent and binge drinking increases the risk of high TG, low HDL-C, high BP, and prevalence of MetS in men. In women, frequent drinking without binge drinking increases the risk of low HDL-C and MetS, whereas frequent and binge drinking increases the risk of abdominal obesity, high TG, and low HDL-C. We propose that improvements in the drinking behaviors can reduce the prevalence of MetS.
- Published
- 2022
88. The Current Status of Nursing Management Practicum during the COVID-19 Pandemic
- Author
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Eun A Kim, Yoomi Jung, Miyoung Kim, Jeong Hee Kim, Myonghwa Park, and Kyung Ryu
- Subjects
General Nursing ,Education - Published
- 2022
89. Residue Free Fabrication of Suspended 2D Nanosheets for in-situ TEM Nanomechanics
- Author
-
Chang Jun Lee, Seong-Gu Hong, Jae-Kyung Ryu, Gyeong Yeol Yun, Rakesh Sadanand Sharbidre, Taik-Nam Kim, Sachin N. Bramhe, and Ji Cheol Byen
- Subjects
In situ ,Residue (chemistry) ,Materials science ,Fabrication ,Chemical engineering ,General Materials Science ,Nanomechanics - Published
- 2018
90. Relationship between dietary intakes and the double burden of malnutrition in adults of Malang, Indonesia: An exploratory study
- Author
-
Soojin Lee and Ho Kyung Ryu
- Subjects
0301 basic medicine ,double burden ,030109 nutrition & dietetics ,Nutrition and Dietetics ,Waist ,Anemia ,business.industry ,malnutrition ,Overweight ,medicine.disease ,Obesity ,Diet ,chronic diseases ,03 medical and health sciences ,Malnutrition ,medicine ,Nutrition transition ,medicine.symptom ,Underweight ,business ,Body mass index ,Food Science ,Demography ,Original Research - Abstract
BACKGROUND/OBJECTIVES Urbanization and lifestyle changes have resulted in nutrition transition. Over-nutrition causes obesity increase, although malnutrition still exists. This phenomenon is called a double burden of malnutrition (DBM). This study was conducted to confirm the existence of DBM and to investigate the dietary factors related to DBM in Indonesian adults. SUBJECTS/METHODS Data for the subjects (51 men and 89 women) who are the adults resided in Malang, Indonesia were collected between July 17 and August 14, 2017, by using questionnaire. Height, weight, waist and hip circumference, blood pressure, blood glucose, total cholesterol, and hemoglobin were also measured for the subjects. RESULTS The average age of the subjects was 47.2 years. The average height, weight, and body mass index for men were 160.08 cm, 62.6 kg and 25.45 kg/m2, respectively, and those for women were 148.74 cm, 58.09 kg, and 26.21 kg/m2, respectively. Of the subjects, 3.6% were underweight, 24.3% were normal or healthy weight, while 72.2% were overweight and obese. Analysis of the dietary intakes revealed high for cereal (7.73 points), but very low for milk (0.25 points) and fruits (0.51 points). Dietary diversity was very few overall (< 5). The occurrence of both anemia (23.6%) and chronic diseases such as hypertension (57.1%), diabetes (12.1%), and hypercholesterolemia (3.6%) was considerably high. The existence of DBM was confirmed by 16.4% of the subjects. DBM was observed significantly higher in women than in men. Dietary diversity and DBM occurrence were inversely correlated. On average, the number of chronic diseases was 1.08 in men and 1.79 in women. Dietary diversity inversely affected systolic blood pressure. CONCLUSIONS DBM existed in adults in Malang, Indonesia due to inadequate dietary intakes, and a high rate of chronic diseases.
- Published
- 2018
91. The condensin holocomplex cycles dynamically between open and collapsed states
- Author
-
Je-Kyung, Ryu, Allard J, Katan, Eli O, van der Sluis, Thomas, Wisse, Ralph, de Groot, Christian H, Haering, and Cees, Dekker
- Subjects
Adenosine Triphosphatases ,Saccharomyces cerevisiae Proteins ,Chromosomal Proteins, Non-Histone ,Protein Conformation ,Gene Expression ,Nuclear Proteins ,Cell Cycle Proteins ,Saccharomyces cerevisiae ,Microscopy, Atomic Force ,DNA-Binding Proteins ,Fungal Proteins ,Adenosine Triphosphate ,Multiprotein Complexes ,Nucleic Acid Conformation ,Chromosomes, Fungal ,DNA, Fungal ,Protein Binding - Abstract
Structural maintenance of chromosome (SMC) protein complexes are the key organizers of the spatiotemporal structure of chromosomes. The condensin SMC complex has recently been shown to be a molecular motor that extrudes large loops of DNA, but the mechanism of this unique motor remains elusive. Using atomic force microscopy, we show that budding yeast condensin exhibits mainly open 'O' shapes and collapsed 'B' shapes, and it cycles dynamically between these two states over time, with ATP binding inducing the O to B transition. Condensin binds DNA via its globular domain and also via the hinge domain. We observe a single condensin complex at the stem of extruded DNA loops, where the neck size of the DNA loop correlates with the width of the condensin complex. The results are indicative of a type of scrunching model in which condensin extrudes DNA by a cyclic switching of its conformation between O and B shapes.
- Published
- 2019
92. AFM images of open and collapsed states of yeast condensin suggest a scrunching model for DNA loop extrusion
- Author
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Thomas Wisse, Je-Kyung Ryu, Cees Dekker, Allard J. Katan, de Groot R, van der Sluis Eo, and Christian H. Haering
- Subjects
0303 health sciences ,biology ,Chemistry ,Condensin ,Protein subunit ,Chromosome ,macromolecular substances ,Yeast ,03 medical and health sciences ,chemistry.chemical_compound ,Condensin complex ,0302 clinical medicine ,biology.protein ,Molecular motor ,Biophysics ,Mitosis ,030217 neurology & neurosurgery ,DNA ,030304 developmental biology - Abstract
SUMMARYStructural Maintenance of Chromosome (SMC) protein complexes are the key organizers of the spatiotemporal structure of chromosomes. The condensin SMC complex, which compacts DNA during mitosis, was recently shown to be a molecular motor that extrudes large loops of DNA. The mechanism of this unique motor, which takes large steps along DNA at low ATP consumption, remains elusive however. Here, we use Atomic Force Microscopy (AFM) to visualize the structure of yeast condensin and condensin-DNA complexes. Condensin is found to exhibit mainly open ‘O’ shapes and collapsed ‘B’ shapes, and it cycles dynamically between these two states over time. Condensin binds double-stranded DNA via a HEAT subunit and, surprisingly, also via the hinge domain. On extruded DNA loops, we observe a single condensin complex at the loop stem, where the neck size of the DNA loop correlates with the width of the condensin complex. Our results suggest that condensin extrudes DNA by a fast cyclic switching of its conformation between O and B shapes, consistent with a scrunching model.
- Published
- 2019
93. Interfacial Electronic Structure of C60/ClAlPc on a MoO3 Layer After Thermal Treatment
- Author
-
Bo Kyung Ryu, Sim Hee Ryu, Sang Wan Cho, Sun Woo Ahn, Kevin E. Smith, Min Gyu Park, and Ji Yun Jeong
- Subjects
Materials science ,General Materials Science ,Thermal treatment ,Electronic structure ,Composite material ,Layer (electronics) - Published
- 2018
94. Models of synaptotagmin-1 to trigger Ca2+-dependent vesicle fusion
- Author
-
Yongsoo Park and Je-Kyung Ryu
- Subjects
0301 basic medicine ,Vesicle fusion ,Chemistry ,Vesicle ,Vesicle docking ,Biophysics ,Cell Biology ,SYT1 ,Biochemistry ,Exocytosis ,Synaptotagmin 1 ,03 medical and health sciences ,030104 developmental biology ,Complexin ,Structural Biology ,Membrane curvature ,Genetics ,Molecular Biology - Abstract
Vesicles in neurons and neuroendocrine cells store neurotransmitters and peptide hormones, which are released by vesicle fusion in response to Ca2+ -evoking stimuli. Synaptotagmin-1 (Syt1), a Ca2+ sensor, mediates ultrafast exocytosis in neurons and neuroendocrine cells. After vesicle docking, Syt1 has two main groups of binding partners: anionic phospholipids and the SNARE (soluble N-ethylmaleimide-sensitive factor attachment protein receptors) complex. The molecular mechanisms by which Syt1 triggers vesicle fusion remain controversial. This Review introduces and summarizes six molecular models of Syt1: (a) Syt1 triggers SNARE unclamping by displacing complexin, (b) Syt1 clamps SNARE zippering, (c) Syt1 causes membrane curvature, (d) membrane bridging by Syt1, (e) Syt1 is a vesicle-plasma membrane distance regulator, and (f) Syt1 undergoes circular oligomerization. We discuss important conditions to test Syt1 activity in vitro and attempt to illustrate the possible roles of Syt1.
- Published
- 2018
95. The Relation Analysis among Physical Self-Concept, Self-esteem and Quality of Life in Participation Leisure Sport Old Adults
- Author
-
Mi-Kyung Ryu and LeeKipyo
- Subjects
education.field_of_study ,media_common.quotation_subject ,Population ,Self-concept ,Self-esteem ,010501 environmental sciences ,Physical strength ,01 natural sciences ,Confirmatory factor analysis ,Developmental psychology ,03 medical and health sciences ,0302 clinical medicine ,Quality of life (healthcare) ,030212 general & internal medicine ,education ,Path analysis (statistics) ,Psychology ,Reliability (statistics) ,0105 earth and related environmental sciences ,media_common - Abstract
The purpose of the study was to investigate how physical self-concept would influence on self-esteem and quality of life in participation leisure sport old adults. In particular, this study verified the structural relationships among physical self-concept, self-esteem and quality of life of the old adults. This paper chose the old adults as population of this paper who take part in leisure sport using convenience sampling. To analysis the data, 298 data were utilized using the SPSS 21.0 Ver. program. To search the respondents demographics traits, frequency analysis were carried out and then reliability analysis and correlation analysis also were conducted. Lastly, using the AMOS 21.0, confirmatory factor analysis and path analysis were carried out. The research results were as follows: First, among physical self-concept variables, condition, physical strength and efficacy had significant influence on self-esteem. Second, among physical self-concept variables, condition and physical strength had significant influence on quality of life. Third, self-esteem had significant influence on quality of life.
- Published
- 2018
96. Traditional Value in <Heosaengjeon許生傳> and Its Educational Implications
- Author
-
Jun Kyung Ryu
- Subjects
Traditional values ,Statistics ,Value (mathematics) ,Mathematics - Published
- 2018
97. Retrospective study of single vitrified-warmed blastocyst transfer cycles according to the presence of morphokinetic variables
- Author
-
Kyung Sil Lim, Seong Ho Yang, Yong Soo Hur, Jin Ho Lim, San Hyun Yoon, Won Don Lee, Chang Seop Hyun, and Eun Kyung Ryu
- Subjects
0301 basic medicine ,030219 obstetrics & reproductive medicine ,Single embryo transfer ,Pronucleus ,urogenital system ,Embryogenesis ,Blastocyst Transfer ,Embryo ,Single Embryo Transfer ,Blastomere ,Biology ,Brief Communication ,Cryopreservation ,Andrology ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,medicine.anatomical_structure ,Blastocyst ,Reproductive Medicine ,Time-lapse ,embryonic structures ,medicine ,reproductive and urinary physiology - Abstract
This study retrospectively assessed whether time-lapse data relating to developmental timing and morphology were associated with clinical outcomes, with the eventual goal of using morphokinetic variables to select embryos prospectively for cryopreservation. In this study, we examined the clinical outcomes of single vitrified-warmed blastocyst transfer cycles that were cultured in a time-lapse incubation system. The morphokinetic variables included uneven pronuclei, an uneven blastomere, multinucleation, and direct, rapid, and irregular division. A total of 164 single vitrified-warmed blastocyst transfer cycles were analyzed (102 cycles of regularly developed blastocysts and 62 cycles of blastocysts with morphokinetic variables). No significant differences in the age of females or the standard blastocyst morphology were found between these two groups. The regularly developed blastocysts showed significantly higher implantation and clinical pregnancy rates than the blastocysts exhibiting morphokinetic variables (30.4% vs. 9.7% and 37.3% vs. 14.5%, respectively; p
- Published
- 2018
98. The Russian Conjunction А as a Discourse Boundary Marker
- Author
-
Jung Won Chung and Jin Kyung Ryu
- Subjects
Mathematical analysis ,Boundary (topology) ,General Medicine ,Geology ,Conjunction (grammar) - Published
- 2018
99. Smoking and Flap Survival
- Author
-
Woo Kyung Ryu, Ji Soo Son, and Kun Hwang
- Subjects
medicine.medical_specialty ,business.industry ,media_common.quotation_subject ,Incidence (epidemiology) ,030230 surgery ,Abstinence ,medicine.disease ,Surgery ,03 medical and health sciences ,0302 clinical medicine ,Hematoma ,medicine ,Flap survival ,Fat necrosis ,Surgical Flaps ,030223 otorhinolaryngology ,business ,Review Articles ,media_common - Abstract
Purpose: The aim of this study was to compare the complications of flap surgery in non-smokers and smokers and to determine how the incidence of complications was affected by the abstinence period from smoking before and after flap surgery. Methods: In PubMed and Scopus, terms “smoking” and “flap survival” were used, which resulted in 113 papers and 65 papers, respectively. After excluding 6 duplicate titles, 172 titles were reviewed. Among them, 45 abstracts were excluded, 20 full papers were reviewed, and finally 15 papers were analyzed. Results: Post-operative complications such as flap necrosis ( P < .001), hematoma ( P < .001), and fat necrosis ( P = .003) occurred significantly more frequently in smokers than in non-smokers. The flap loss rate was significantly higher in smokers who were abstinent for 24 hours post-operatively than in non-smokers (n = 1464, odds ratio [OR] = 4.885, 95% confidence interval [CI] = 2.071-11.524, P < .001). The flap loss rate was significantly lower in smokers who were abstinent for 1 week post-operatively than in those who were abstinent for 24 hours post-operatively (n = 131, OR = 0.252, 95% CI = 0.074-0.851, P = .027). No significant difference in flap loss was found between non-smokers and smokers who were abstinent for 1 week preoperatively (n = 1519, OR = 1.229, 95% CI = 0.482-3.134, P = .666) or for 4 weeks preoperatively (n = 1576, OR = 1.902, 95% CI = 0.383-2.119, P = .812). Conclusion: Since smoking decreases the alveolar oxygen pressure and subcutaneous wound tissue oxygen, and nicotine causes vasoconstriction, smokers are more likely to experience flap loss, hematoma, or fat necrosis than non-smokers. Preoperative and post-operative abstinence period of at least 1 week is necessary for smokers who undergo flap operations.
- Published
- 2018
100. The Genre Change of Seodaeju-jeon and its meaning
- Author
-
Jun-Kyung Ryu
- Subjects
Philosophy ,General Medicine ,Meaning (existential) ,Linguistics - Published
- 2017
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