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Split Liver Transplantation for Retroperitoneal Immature Teratoma Masquerading as Hepatoblastoma
( Dongkyu Oh ),( Nam-joon Yi ),( Hyeyoung Kim ),( Hyun-young Kim ),( Hyoung Jin Kang ),( Myungsu Lee ),( Kyoung Bun Lee ),( Kwang-woong Lee ),( Kyung-suk Suh ),( Berik Rovgaliyev ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Extragonadal teratoma originating from retroperitoneum represents less than 5% of all teratomas, and accounts for less than 10% of all pediatric retroperitoneal neoplasm. Until now, there is no report in the English literature about teratoma managed with liver transplantation (LT). The present study reports the case of an infant aged 3 months with retroperitoneal immature teratoma involving hepatic hilum and refractory to the chemotherapy, treated with liver transplantation. Methods: The patient was referred to our hospital for management of growing abdominal mass. The pathologic report for fine needle aspiration of the tumor lesion suggested the possibility for the hepatoblastoma with teratoid features. Cisplatin based chemotherapy was initiated at first. However, in spite of two cycles of chemotherapy, the tumor was rapidly growing with encasing the proper hepatic artery. LT was then planned, and split LT was carried out. Results: Pathological examination of explanted liver revealed the involvement of numerous neuroepithelial components, confirming the diagnosis of Norris grade III immature teratoma. Conclusions: The patient recovered well and was discharged at the 19th day after LT. He is now on postoperative day 84, under adjuvant chemotherapy based on vinblastine and doxorubicin, and the long-term outcome of a LT for immature teratoma should be followed up.
교통카드 데이터를 활용한 대중교통 최적전략 통행배정과 실제 통행행태 비교 분석
오동규(Dongkyu Oh),이인묵(Inmook Lee) 한국도시철도학회 2021 한국도시철도학회논문집 Vol.9 No.4
최적전략 통행배정기법은 대중교통계획 단계에서 통행배정기법으로 주로 사용된다. 그러나 최적전략 통행배정기법이 만들어졌을 당시에는 대중교통 이용자가 얻을 수 있는 정보에 한계가 있어 이 배정기법은 강건한 가정을 기반으로 하였다. 현재의 대중교통 이용자들은 버스정보시스템이나 대중교통 이용자 정보시스템 등을 통해 본인의 통행시간을 최소화하는 경로를 이용할 수 있는데, 이에 따라 최적전략 통행배정기법의 경로선택과 실제 통행행태가 다를 것임을 가정하고 추정치와 실제치를 비교하였다. 그 결과 통행패턴과 통행량은 추정치와 실제치가 유의미한 차이가 있고, 통행시간은 큰 차이가 없는 것으로 분석되었다. 본 연구의 결과는 향후 대중교통통행배정 모형의 개선에 활용될 수 있을 것이다. The Optimal Strategy Transit Assignment (OSTA) is mostly used as a transit assignment model in public transportation planning stage. When the OSTA was developed, there was a limit to the information available to public transportation users, so this method was based on robust assumptions. However, current public transportation users can use a route that minimizes their travel time using the bus information systems or applications. Therefore, this study compared the estimated and actual values assuming that the route selection and actual travel behavior of the OSTA would be different. As a result, it was analyzed that there was a significant difference between the estimated value and the actual value for travel pattern and traffic volume, and there was no significant difference in travel time. The results of this study can be used to improve the public transportation assignment model in the future.
Dongkyu Lee,Youngeun Kim,Oh Hyeong Kwon,Won Ho Park,Donghwan Cho 한국탄소학회 2021 Carbon Letters Vol.31 No.3
The effect of multi-walled carbon nanotubes (MWCNT) coating in the presence of polyethyleneimine (PEI) of different molecular weights (MW) on the interfacial shear strength (IFSS) of carbon fiber/acrylonitrile–butadiene–styrene (ABS) and carbon fiber/epoxy composites was investigated. The IFSS between the carbon fiber and the polymer was evaluated by means of single fiber microbonding test. The results indicated that uses of the carbon fibers uncoated and coated with pristine, low MW PEI-treated, and high MW PEI-treated MWCNT significantly influenced the IFSS of both thermoplastic and thermosetting carbon fiber composites as well as the carbon fiber surface topography. The incorporation of low MW (about 1300) PEI into the carboxylated MWCNT was more effective not only to uniformly coat the carbon fiber with the MWCNT but also to improve the interfacial bonding strength between the carbon fiber and the polymer than that of high MW (about 25,000) PEI. In addition, carbon fiber/epoxy composite exhibited the IFSS much higher than carbon fiber/ABS composite due to the chemical interactions between the epoxy resin and amine groups existing in the PEI-treated MWCNT.
Dongkyu Lee,Kwanghyun Kim,Youngrong Lee,Kyungwon Oh,정선재 대한예방의학회 2022 예방의학회지 Vol.55 No.6
Objectives: Thiamine is thought to modify sleeping patterns, while alcohol use diminishes internal thiamine levels. We investigated the association between thiamine intake and sleep duration and explored possible heterogeneity in the effect according to alcohol use. Methods: In total, 15 384 participants aged 19-64 were obtained from the Korea National Health and Nutrition Examination Survey 2012-2016. Nutrient intake, including thiamine, was measured using a food frequency questionnaire. Sleep duration was measured by a self-reported questionnaire. The highest thiamine intake quartile was set as the reference group. Participants were divided into 3 groups, with 7-8 hours of daily sleep as a reference group and those who slept more or less than that as “oversleeping” and “insufficient sleeping,” respectively. Multivariate logistic regression was used, adjusting for socioeconomic, medical, and nutritional factors. Additionally, participants were stratified according to high-risk alcohol use defined by the World Health Organization standards on alcohol use. Results: Low thiamine intake was associated with oversleeping (Q3: odds ratio [OR], 1.06; 95% confidence interval [CI], 0.86 to 1.32; Q2: OR, 1.24; 95% CI, 0.99 to 1.55; Q1: OR, 1.49; 95% CI, 1.16 to 1.91) and showed a significant trend for higher ORs at lower intake levels (p-trend<0.001). The effect was stronger in the high-risk alcohol use group (Q1: OR, 1.78; 95% CI, 1.28 to 2.49). Conclusions: Low thiamine intake was associated with oversleeping, and alcohol use intensified that association. These results were found in a context where overt clinical symptoms due to thiamine deficiency are considered rare. More awareness of the potential relationship of thiamine intake with oversleeping and its related risks should be considered.
Visual tracking in HEVC compressed videos
Oh, Seoung‐,Jun,Yoon, Seongro,Lee, Dongkyu Wiley Subscription Services, Inc., A Wiley Company 2016 IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENG Vol.11 No.suppl2
<P>We present a robust visual tracking algorithm to track a rigid object in high efficiency video coding (HEVC) compressed-domain. Based on a Markov random field model, we estimate the target object state by using motion vector extracted from compressed bitstream. Especially, we employ residual discrete cosine transform (DCT) coefficient (RDC) in the bitstream as the shape information of the target object to prevent the drift problem. The measurements of motion vector and RDC are adaptively reflected through our potential functions for the target state. Our experiments on test sequences compressed by an HEVC encoder show that it is robust to track rigid objects. (c) 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.</P>
Lee, Dongkyu,Kim, Dowon,Kim, Youngwoong,Park, Ki-hyun,Oh, Eun-Jee,Kim, Yonggoo,Kim, Byungkyu SAGE Publications 2014 Journal of laboratory automation Vol.19 No.1
<P>We present a negative dielectrophoresis (n-DEP)–based cell separation system for high-throughput and high-efficiency cell separation. To achieve a high throughput, the proposed system comprises macro-sized channel and cantilever-type electrode (CE) arrays (L × W × H = 150 µm × 500 µm × 50 µm) to generate n-DEP force. For high efficiency, double separation modules, which have macro-sized channels and CE arrays in each separation module, are employed. In addition, flow regulators to precisely control the hydrodynamic force are allocated for each outlet. Because the hydrodynamic force and the n-DEP force acting on the target cell are the main determinants of the separation efficiency, we evaluate the theoretical amount of hydrodynamic force and n-DEP force acting on each target cell. Based on theoretical results, separation conditions are experimentally investigated. Finally, to demonstrate the separation performance, we performed the separation of target cells (live K562) from nontarget cells (dead K562) under conditions of low voltage (7Vp-p with 100 kHz) and a flow rate of 15 µL•min<SUP>−1</SUP>, 6 µL•min<SUP>−1</SUP>, and 8 µL•min<SUP>−1</SUP> in outlets 1, 2, and 3, respectively. The system can separate target cells with 95% separation efficiency in the case of the ratio of 5:1 (live K562:dead K562).</P>