Portal Vein Arterializations in Hilar Cholangiocarcinoma

Jonghee Yoon,Jeongsu Nam,Younghwan Kim,Jiwoong Hwang,Kibyung Song,Jaehoon Lee,Youngjoo Lee,Kwangmin Park 한국간담췌외과학회 2012 한국간담췌외과학회 학술대회지 Vol.2012 No.4

Systematic Analysis for the Effects of Atmospheric Pollutants in Cathode Feed on the Performance of Proton Exchange Membrane Fuel Cells

Yoon, Young-Gon,Choi, Insoo,Lee, Chang-Ha,Han, Jonghee,Kim, Hyoung-Juhn,Cho, EunAe,Yoo, Sung Jong,Nam, Suk Woo,Lim, Tae-Hoon,Yoon, Jong Jin,Park, Sehkyu,Jang, Jong Hyun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.12

This paper describes how primary contaminants in ambient air affect the performance of the cathode in fuel cell electric vehicle applications. The effect of four atmospheric pollutants ($SO_2$, $NH_3$, $NO_2$, and CO) on cathode performance was investigated by air impurity injection and recovery test under load. Electrochemical analysis via polarization and electrochemical impedance spectroscopy was performed for various concentrations of contaminants during the impurity test in order to determine the origins of performance decay. The variation in cell voltage derived empirically in this study and data reported in the literature were normalized and juxtaposed to elucidate the relationship between impurity concentration and performance. Mechanisms of cathode degradation by air impurities were discussed in light of the findings.

Optical induction of muscle contraction at the tissue scale through intrinsic cellular amplifiers.

Yoon, Jonghee,Choi, Myunghwan,Ku, Taeyun,Choi, Won Jong,Choi, Chulhee Wiley 2014 Journal of biophotonics Vol.7 No.8

<P>The smooth muscle cell is the principal component responsible for involuntary control of visceral organs, including vascular tonicity, secretion, and sphincter regulation. It is known that the neurotransmitters released from nerve endings increase the intracellular Ca(2+) level in smooth muscle cells followed by muscle contraction. We herein report that femtosecond laser pulses focused on the diffraction-limited volume can induce intracellular Ca(2+) increases in the irradiated smooth muscle cell without neurotransmitters, and locally increased intracellular Ca(2+) levels are amplified by calcium-induced calcium-releasing mechanisms through the ryanodine receptor, a Ca(2+) channel of the endoplasmic reticulum. The laser-induced Ca(2+) increases propagate to adjacent cells through gap junctions. Thus, ultrashort-pulsed lasers can induce smooth muscle contraction by controlling Ca(2+), even with optical stimulation of the diffraction-limited volume. This optical method, which leads to reversible and reproducible muscle contraction, can be used in research into muscle dynamics, neuromuscular disease treatment, and nanorobot control.</P>

Measuring optical transmission matrices by wavefront shaping

Yoon, Jonghee,Lee, KyeoReh,Park, Jongchan,Park, YongKeun The Optical Society 2015 Optics express Vol.23 No.8

Architecture customization of on-chip reconfigurable accelerators

Yoon, Jonghee W.,Lee, Jongeun,Park, Sanghyun,Kim, Yongjoo,Lee, Jinyong,Paek, Yunheung,Cho, Doosan Association for Computing Machinery 2013 ACM transactions on design automation of electroni Vol.18 No.4

<P>Integrating coarse-grained reconfigurable architectures (CGRAs) into a System-on-a-Chip (SoC) presents many benefits as well as important challenges. One of the challenges is how to customize the architecture for the target applications efficiently and effectively without performing explicit design space exploration. In this article we present a novel methodology for incremental interconnect customization of CGRAs that can suggest a new interconnection architecture which is able to maximize the performance for a given set of application kernels while minimizing the hardware cost. In our methodology, we translate the problem of interconnect customization into that of inexact graph matching, and we devised a heuristic for A* search algorithm to efficiently solve the inexact graph matching problem. Our experimental results demonstrate that our customization method can quickly find application-optimized interconnections that exhibit 80% higher performance on average compared to the base architecture which has mesh interconnections, with little energy and hardware increase in interconnections and muxes.</P>

현대 자본주의 경제에서 금융시스템의 진화

윤종희(Yoon, Jonghee) 비판사회학회 2017 경제와 사회 Vol.- No.115

1980년대부터 금융 부문이 빠르게 성장한다. 포스트 케인스주의는 이를 ‘금융주도 자본주의’로 규정한다. 이에 따르면, ‘금융’과 산업은 이자율, 배당금 등과 관련해 서로 대립한다. 1980년대부터 뉴딜·케인스주의적 금융규제가 완화되자, 금융기관은 일련의 ‘금융혁신’을 단행해 수익을 극대화한다. 그 결과, 산업의 희생 위에 ‘금융화’가 발생하고 금융에 고유한 불안정성이 심화된다. 그것은 2007~2009년의 세계적 금융위기에서 정점에 달한다. 그러나 이 같은 견해는 금융과 산업의 관계에 관한 피상적인 인식에서 비롯된 것으로 보인다. 이 연구는 ‘금융’을 금리생활자와 금융기업으로 구분한 후, 이들과 산업의 관계를 분석함으로써 ‘금융’과 산업의 계급적 대립이 허구적임을 규명한다. 이를 토대로 ‘금융’은 자신의 고유한 발전 법칙이 아니라 산업자본의 축적 과정에서 나타난 변화에 조응하여 진화한다는 사실을 논증한다. 아울러 ‘금융화’는 금융의 투기적 본성의 결과가 아니라 이윤율의 하락에 따른 실물경제의 구조적 위기를 표현할 뿐이라고 주장한다. The financial sector has grown since 1980s. Post-Keynesian economists define this as ‘finance-led capitalism’. According to them, ‘finance’ and industry are opposed to each other in terms of interest rates, dividends and so on. Once the New Deal-Keynesian financial regulations have been eased since the 1980s, the ‘finance’ has made a series of ‘financial innovations’ to maximize profits. As a result, ‘financialization’ arises on the sacrifice of industry and instability inherent in finance deepens. It peaked in the global financial crisis of 2007~2009. This view, however, seems to have come from a superficial recognition of the relationship between ‘finance’ and industry. This study splits ‘finace’ into ‘rentier’ and ‘financial firm’, and analyzes the relationship between ‘finance’ and industry. It will argue that the class-based antagonization between them is fictitious. On the basis of this, it will propose that financial sector has evolved in accordance with the changes in the accumulation of industrial capital, not its own development law. In addition, it will be argued that ‘financialization’ is not a result of the speculative nature of finance, but an expression of the structural crisis in the real economy which is caused by a fall in the rate of profit.

시민성의 역사성 : T. H. 마셜에 대한 비판을 중심으로

윤종희(Jonghee Yoon) 경희대학교 인류사회재건연구원 2017 OUGHTOPIA Vol.32 No.1

정치위기가 심화되는 가운데 보편적 권리를 지향하는 시민정치가 새롭게 주목받고 있다. (세계) 시민성의 이상은 어떻게 실현할 수 있을까? 마셜(T. H. Marshall)에 참조하는 기존의 논의는 시민성을 정태적으로 인식하기 때문에 이 같은 질문 앞에서 다소 무기력하다. 본 논문은 논리적·역사적 측면에서 마셜을 비판함으로써 시민성의 역사적 진화 메커니즘을 규명한다. 아울러 시민정치를 두 가지 형태(시민적 지위를 쟁점으로 하는 1형태와 시민의 권리를 쟁점으로 하는 2형태)로 구분하고 이들의 관계를 조명한다. 시민성은 보편성을 지향하지만 자본주의적 계급관계 위에서 구성되기 때문에 제한될 수밖에 없다. 시민의 지위로부터 여성과 노동자계급을 배제할 뿐만 아니라, 시민의 권리 내부에서도 자유주의적 소유권과 사회주의적 노동권이 대립한다. 바로 이 같은 배제와 대립이 시민성의 진화를 초래한다. 시민의 범주에서 배제된 노동자계급은 노동권을 지향하는 과정에서 정치적 권리를 실효적으로 향유한다. 결국 시민정치의 ‘2형태’가 ‘1형태’의 발전을 추동하는 것이다. 이 같은 주장은 세계시민에 관한 논의에 시사하는 바가 크다. 여기서도 ‘1형태’보다 ‘2형태’가 우선할 것이고, 시민의 권리를 둘러싼 정치가 세계적 차원에서 전개될 때 세계시민의 이상에 한 걸음 더 다가갈 수 있을 것이다. As the political crisis deepens, the civil politics which aims at the universal rights are attracting attention. How can the ideals of the (world) citizen be realized? The existing studies with reference to T. H. Marshall is somewhat helpless in the face of this question, since it regards citizenship as static. This article examines the historical evolution mechanism of citizenship by criticizing Marshall in logical and historical terms. I want to divide the civil politics into two forms (the first form with an issue of civil status and the second form with an issue of citizen"s rights) and highlight the relationship between them. Citizenship is universal, but it can only be realized in a limited form because it is constituted on the capitalist class relations, Not only does it exclude women and the working class from the civil status, but also the (liberalist) property rights and (socialist) the rights to work contradict each other within the civil rights. Such exclusion and contradiction cause the evolution of citizenship. The working class, excluded from the citizens" category, can effectively enjoy the political rights in the process of realizing labor rights. In a nutshell, ‘the 2nd form’ of civil politics drives the development of ‘the 1st form’. This argument provides important implications for the discussion of world citizenship. Here again, "the 2nd form" will have priority over "the 1st form". When such a politics develops on a global scale beyond nation-states, we will be able to reach a step closer to the ideal.

CGRA 를 위한 전력이 고려된 어플리케이션 매핑에 관한 연구

윤종희 ( Jonghee W. Yoon ),김용주 ( Yongjoo Kim ),박상현 ( Sanghyun Park ),조두산 ( Doosan Cho ),이종원 ( Jongwon Lee ),김경원 ( Kyungwon Kim ),백윤흥 ( Yunheung Paek ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1

최근에 응용프로그램의 복잡도가 증가함에 따라 이를 빠르게 처리하기 위하여 각종 멀티미디어 SoC 에서 Coarse Grained Reconfigurable Architecture (CGRA) 들이 사용되고 있다. CGRA 가 제공하는 병렬성을 극대화하기 위한 많은 어플리케이션 매핑 알고리즘이 연구되어 왔으나 CGRA 에서 소모되는 전력을 줄이기 위한 노력은 거의 없는 상태이다. 이러한 문제를 극복하기 위해 본 논문에서는 기존의 매핑 알고리즘을 기반으로 누설전력을 줄이기 위한 방법에 대해 다루고자 한다.

The association between occupational stress level and health-related productivity loss among Korean employees

Jonghee Chung,Jin-Hyo Kim,Jae Yoon Lee,Hee Seok Kang,Dong-Wook Lee,Yun-Chul Hong,Mo-Yeol Kang 한국역학회 2022 Epidemiology and Health Vol.45 No.-

OBJECTIVES: Occupational stress management is particularly important for successful business operations, since occupational stress adversely affects workers’ health, eventually lowering their productivity. Therefore, this study aimed to investigate the correlation between occupational stress and health-related productivity loss (HRPL) among Korean workers. METHODS: In 2021, 1,078 workers participated in a web-based questionnaire survey. HRPL was measured using the Work Productivity and Activity Impairment Questionnaire, and occupational stress was measured using the Korean Occupational Stress Scale-Short Form. The occupational stress level was divided into tertiles (low, intermediate, and high), and the low occupational stress group was used as the reference group. Using a generalised linear model, differences in labour productivity loss according to the level of occupational stress were tested after adjusting for demographic characteristics such as age, gender, education level, household income, occupation, and underlying medical conditions. RESULTS: Non-parametric regression analysis of HRPL according to occupational stress showed a direct association between occupational stress and HRPL. A statistically significant difference was observed in HRPL between participants with intermediate and high occupational stress and those with low occupational stress. CONCLUSIONS: Our results support the hypothesis that high occupational stress is associated with decreased labour productivity.

Clinical characteristics and mortality risk factors among trauma patients by age groups at a single center in Korea over 7 years: a retrospective study

( Jonghee Han ),( Su Young Yoon ),( Junepill Seok ),( Jin Young Lee ),( Jin Suk Lee ),( Jin Bong Ye ),( Younghoon Sul ),( Seheon Kim ),( Hong Rye Kim ) 대한외상학회 2023 大韓外傷學會誌 Vol.36 No.4

Purpose: In this study, we aimed to compare the characteristics of patients with trauma by age group in a single center in Korea to identify the clinical characteristics and analyze the risk factors affecting mortality. Methods: Patients aged ≥18 years who visited the Chungbuk National University Hospital Regional Trauma Center between January 2016 and December 2022 were included. The accident mechanism, severity of the injury, and outcomes were compared by classifying the patients into group A (18-64 years), group B (65-79 years), and group C (≥80 years). In addition, logistic regression analysis was performed to identify factors affecting death. Results: The most common injury mechanism was traffic accidents in group A (40.9%) and slipping in group B (37.0%) and group C (56.2%). Although group A had the highest intensive care unit admission rate (38.0%), group C had the highest mortality rate (9.5%). In the regression analysis, 3 to 8 points on the Glasgow Coma Scale had the highest odds ratio for mortality, and red blood cell transfusion within 24 hours, intensive care unit admission, age, and Injury Severity Score were the predictors of death. Conclusions: For patients with trauma, the mechanism, injured body region, and severity of injury differed among the age groups. The high mortality rate of elderly patients suggests the need for different treatment approaches for trauma patients according to age. Identifying factors affecting clinical patterns and mortality according to age groups can help improve the prognosis of trauma patients in the future.