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Byeon, Jung Hye,Kim, Gun-Ha,Kim, Joo Yeon,Sun, Woong,Kim, Hyun,Eun, Baik-Lin The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.46 No.4
Objective : Perinatal hypoxic-ischemic encephalopathy (HIE) and prolonged febrile seizures (pFS) are common neurologic problems that occur during childhood. However, there is insufficient evidence from experimental studies to conclude that pFS directly induces hippocampal injury. We studied cognitive function and histological changes in a rat model and investigated which among pFS, HIE, or a dual pathologic effect is most detrimental to the health of children. Methods : A rat model of HIE at postnatal day (PD) 7 and a pFS model at PD10 were used. Behavioral and cognitive functions were investigated by means of weekly open field tests from postnatal week (PW) 3 to PW7, and by daily testing with the Morris water maze test at PW8. Pathological changes in the hippocampus were observed in the control, pFS, HIE, and HIE+pFS groups at PW9. Results : The HIE priming group showed a seizure-prone state. The Morris water maze test revealed a decline in cognitive function in the HIE and HIE+pFS groups compared with the pFS and control groups. Additionally, the HIE and HIE+pFS groups showed significant hippocampal neuronal damage, astrogliosis, and volume loss, after maturation. The pFS alone induced minimal hippocampal neuronal damage without astrogliosis or volume loss. Conclusion : Our findings suggest that pFS alone causes no considerable memory or behavioral impairment, or cellular change. In contrast, HIE results in lasting memory impairment and neuronal damage, gliosis, and tissue loss. These findings may contribute to the understanding of the developing brain concerning conditions caused by HIE or pFS.
Kim, In-Wha,Myung, Seung-Jae,Do, Mi Young,Ryu, Yeon-Mi,Kim, Mi Jung,Do, Eun-Ju,Park, Sehan,Yoon, Soon Man,Ye, Byong Duk,Byeon, Jeong-Sik,Yang, Suk-Kyun,Kim, Jin-Ho Blackwell Publishing Asia 2010 Journal of gastroenterology and hepatology Vol.25 No.11
<P>Abstract</P><P>Background and Aim: </P><P>A Western-style diet (WD) is known to play an important role in inflammatory bowel disease and colon carcinogenesis. The purpose of this study was to understand the role of macrophages in WD-induced colitis associated with carcinogenesis.</P><P>Methods: </P><P>Male BALB/c mice were fed a WD or a control diet (CD) for 4 weeks and exposed to azoxymethane (AOM) followed by 2% dextran sulfate sodium (DSS) for 7 days.</P><P>Results: </P><P>The WD increased susceptibility to DSS-induced inflammation and accelerated the infiltration of macrophages. The incidence and multiplicity of colon tumors were higher in mice fed the WD than in those fed the CD (<I>P</I> < 0.05). Levels of prostaglandin-endoperoxide synthase (PTGS) 2 and prostaglandin (PG) E<SUB>2</SUB> in the colon were higher after treatment with AOM and DSS in mice fed the WD than in those fed the CD. In addition, WD consumption increased the DNA binding activity of nuclear factor-kappaB and the serum concentration of tumor necrosis factor (TNF)-&agr;. Mice fed the WD had higher numbers of F4/80-positive cells surrounding cancer cells compared with mice fed the CD. These cells expressed PTGS2, TNF-&agr; and &bgr;-catenin, which are up-regulated by the WD. We also found that the WD increased unphosphorylated &bgr;-catenin accumulation in the cytoplasm and nucleus of colon cancer cells.</P><P>Conclusions: </P><P>A WD increases the susceptibility to DSS-induced inflammation and accelerates the infiltration of macrophages. In turn, this resulted in the development and progression of colon cancer.</P>
Jeong, Yeon Hun,Oh, Kyeongmin,Ahn, Sungha,Kim, Na Young,Byeon, Ayeong,Park, Hee-Young,Lee, So Young,Park, Hyun S.,Yoo, Sung Jong,Jang, Jong Hyun,Kim, Hyoung-Juhn,Ju, Hyunchul,Kim, Jin Young Elsevier 2017 Journal of Power Sources Vol.363 No.-
<P><B>Abstract</B></P> <P>Precise monitoring of electrolyte leaching in high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) devices during lifetime tests is helpful in making a diagnosis of their quality changes and analyzing their electrochemical performance degradation. Here, we investigate electrolyte leaching in the performance degradation of phosphoric acid (PA)-doped polybenzimidazole (PBI) membrane-based HT-PEMFCs. We first perform quantitative analyses to measure PA leakage during cell operation by spectrophotometric means, and a higher PA leakage rate is detected when the current density is elevated in the cell. Second, long-term degradation tests under various current densities of the cells and electrochemical impedance spectroscopy (EIS) analysis are performed to examine the influence of PA loss on the membrane and electrodes during cell performance degradation. The combined results indicate that PA leakage affect cell performance durability, mostly due to an increase in charge transfer resistance and a decrease in the electrochemical surface area (ECSA) of the electrodes. Additionally, a three-dimensional (3-D) HT-PEMFC model is applied to a real-scale experimental cell, and is successfully validated against the polarization curves measured during various long-term experiments. The simulation results highlight that the PA loss from the cathode catalyst layer (CL) is a significant contributor to overall performance degradation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The influences of electrolyte leakage on the performance of HT-PEMFC were studied. </LI> <LI> We evaluated PA leakage during the cell operation with a colorimetric detection. </LI> <LI> The higher PA leakage was observed at operation at elevated current densities. </LI> <LI> The PA loss from cell operation caused long-term performance degradation. </LI> <LI> The degradation mechanisms were investigated. </LI> </UL> </P>
대한간학회지 제6차 춘계학술대회 초록집 : 구연 ; 만성 B형 간질환에서 Lamivudine투여 후 혈소판 수의 변화와 Thrombopoietin의 역할
연종은 ( Yeon Jong Eun ),김경오 ( Kim Gyeong O ),손수민 ( Son Su Min ),김윤홍 ( Kim Yun Hong ),공휘 ( Gong Hwi ),김지훈 ( Kim Ji Hun ),서연석 ( Seo Yeon Seog ),박상훈 ( Park Sang Hun ),권오상 ( Kwon O Sang ),변관수 ( Byeon Gwan S 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.1(S)
2018평창동계올림픽의 성공적 개최를 위한 현안과 과제
변연하(Yeon-Ha Byeon),김동선(Dong-Sun Kim),김흥태(Heung-Tae Kim) 한국엔터테인먼트산업학회 2011 한국엔터테인먼트산업학회논문지 Vol.5 No.4
본 논문은 2018평창동계올림픽의 성공적 개최와 관련한 다양한 이슈의 선점과 함께 성공적 개최를 위한 현안과 과제에 대한 이슈 확산을 연구의 배경 및 필요성으로 설정하였다. 이와 같은 연구의 배경 및 필요성을 전제로 2018평창동계을림픽의 성공적 개최를 위한 국가적ㆍ지역적ㆍ경기적 측면의 현안 조명을 통한 과제 제시를 본 연구의 목적으로 설정하여, 각 종 참고문헌 및 자료의 고찰ㆍ분석을 통한 문헌연구의 방법을 통해 다음과 같은 연구 결과를 제시하고 있다. 첫째, 2018평창동계올림픽의 성공적 개최를 위해 올림픽 기반시설의 정비 및 확충이 필요하다. 둘째, 2018평창동계올림픽의 성공적 개최를 위해 올림픽 경기시설의 합리적인 조성 및 사후활용 방안의 강구가 필요하다. 셋째, 2018평창동계올림픽의 성공적 개최를 위해 평창 알펜시아 지원특별법과 특구지정이 필요하다. 넷째, 2018평창동계올림픽의 성공적 개최를 위해 메달종목 다변화를 위한 경기력 향상 방안의 강구가 필요하다. 다섯째, 2018평창동계올림픽의 성공적 개최를 위해 올림픽 효과 분배와 평화올림픽을 통한 새로운 올림픽 운동의 전개가 추진되어야 할 것이다. Studying for the literature, the purpose of this study is to present issues and tasks for the successful hosting of the 2018 Pyeongchang Winter Olympic Games. This study is composed of four sections: 1) The necessity and purpose of the study; 2) The importance of the 2018 Pyeongchang Winter Olympic Games holding; 3) Issues and tasks for the 2018 Pyeongchang Winter Olympic Games; and 4) Conclusion and suggestion. For the successful hosting of the 2018 Pyeongchang Winter Olympic Games, this study suggests the following tasks. First, infrastructure maintenance and expansion are needed. Second, optimal Olympic facilities and plans for their post-use should be prepared. Third, the special law and district to support Alpensia are required. Fourth, strategies to improve players" performance should be arranged. Fifth, the effective distribution of achievement and the peaceful Olympic campaign are needed.
췌담도 ; 햄스터에서 고콜레스테롤 식이 후 담낭의 유전자 발현
김경오 ( Kim Gyeong O ),김재선 ( Kim Jae Seon ),박기호 ( Park Gi Ho ),임형준 ( Im Hyeong Jun ),김진용 ( Kim Jin Yong ),연종은 ( Yeon Jong Eun ),박종재 ( Park Jong Jae ),변관수 ( Byeon Gwan Su ),박영태 ( Park Yeong Tae ),이창홍 ( L 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> 담낭의 코레스테롤 담석 생성 기전으로 콜레스테롤 과포화, 담낭의 운동 장애, 담낭내 콜레스테롤 결정화, 담낭 내 점액 과분비 등의 장애로 설명되고 있지만, 많은 논란이 있는 실정이다. 최근에는 담낭에서의 다양한 유전자 변화가 담석 형성에 있어 중요한 역할을 하는 것으로 연구되고 있다. 이에 연자들은 햄스터에서 고콜레스테롤 식이 후 담낭내 담석 형성에 있어서 담낭에서의 유전자 변화를 알아보기 위하여 본 연구를 시행하였다. <방법> 생후 5주경의
QUAL2K 모형을 이용한 도시하천의 효율적 수질관리방안 - 인천광역시 심곡천을 중심으로 -
김소연 ( So Yeon Kim ),변성준 ( Seong Joon Byeon ),김주원 ( Joo Won Kim ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.1
Urban rivers have generally been maintained in order to prevent flooding, but there is a need to establish sustainable plans for both conservation and management. In this study, the effects of water quality improvement were analyzed using scenarios of water quality assesment and the diagnosis of pollution causes. The study focused on Shimgok Stream in which the improvement of odor and green algae is a major issue as it is in other urban rivers. Where as the upstream portion of the stram was clean and had low flow, the middle portion of the stream was contaminated with sewage source water that flowed into both the reservoir and the stream. In contrast, the discharged water from the sewage treatment plant met water quality standards, and it is thought that increasing discharge is needed to improve stream maintenance. In addition, non-point sources were thought to be the main cause of poor water quality because a decrease in water quality and an increase in contamination was found from upstream to downstream. Through the application of the QUAL2K model, three potential water quality improvements were plotted: increasing discharge water from the sewage treatment, reducing contaminants in the reservoir, and reducing non-point source. The results show the reducing non-point sources by 75% had the greatest effect, decreasing BOD below 8.0 mg/L in all sections. Yet, it was difficult to achieve a 5.0 mg/L which suggests that a number of measures should be considered comprehensively to achieve the target water quality.
대한간학회지 제6차 춘계학술대회 초록집 : 구연 ; 만성 B형 간염에서 라미부딘 치료중 e항원 음전율 및 투약중단 후 재발율
서연석 ( Seo Yeon Seog ),김윤홍 ( Kim Yun Hong ),김경오 ( Kim Gyeong O ),손수민 ( Son Su Min ),박상훈 ( Park Sang Hun ),연종은 ( Yeon Jong Eun ),변관수 ( Byeon Gwan Su ),이창홍 ( Lee Chang Hong ),권오상 ( Kwon O Sang ),김선숙 ( Ki 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.1(S)
제5차 대한간학회 춘계학술대회 초록집 : 포스터 전시 순서 ; 간에 단일결절로 나타난 특발성 과호산구증가 증후군 치험 1예
서연석 ( Seo Yeon Seog ),김경오 ( Kim Gyeong O ),손수민 ( Son Su Min ),김윤홍 ( Kim Yun Hong ),박상훈 ( Park Sang Hun ),권오상 ( Kwon O Sang ),연종은 ( Yeon Jong Eun ),변관수 ( Byeon Gwan Su ),이창홍 ( Lee Chang Hong ) 대한간학회 1999 Clinical and Molecular Hepatology(대한간학회지) Vol.5 No.1(S)