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김형준,이우미,안선호,송주흥,김재민,김성완,이상열,Kim, Hyoung-Jun,Lee, Woo-Mi,Ahn, Seon-Ho,Song, Ju-Heung,Kim, Jae-Min,Kim, Sung-Wan,Lee, Sang-Yeol 대한불안의학회 2006 대한불안의학회지 Vol.2 No.2
Objective : In this study, we investigated the prevalence of depression and its impact on the healthrelated Quality of life (HRQoL) of the patients with End-Stage Renal Disease (ESRD) on Hemodialysis. Method : The Quality of life (QOL) of patients was evaluated by HRQoL Questionnaire, "Medical Outcome Survey 36-Item Short Form Health Survey Korean Version (SF-36-K)". The patients on Hemodialysis in ESRD, were chosen from the hemodialytic room at Wonkwang University and Jeongeup-Asan Hospital. The number of patients was 95 (64 from Wonkwang University Hospital and 31 from Jeongeup-Asan Hospital) and all of them were above 19 years old. We performed various investigations to find a statistical correlations between HRQoL and physical & psychosocial factors such as the demographic characteristics, clinical characteristics (hemoglobin level and albumin level etc), and the score of Beck's depressive inventory (BDI). Results : The HRQoL value of patients on hemodialysis in ESRD is far poorer than the HRQoL reference value of Koreans and Americans, who are in normal healthly. The prevalence of depressive symptoms by BDI of the ESRD patients on hemodialysis is 68.6%, and age and depression have negative correlations with HRQoL of the patients. However, education level, serum albumin level, and social support have positive correlations with HRQoL. The patient group with depression has significantly poorer HRQoL than the group without depression. Conclusion : The HRQoL of ESRD patients on hemodialysis is not good in both physical and mental aspects. The prevalence of depression is very high and depression has negative impact of HRQoL of patients. Based on our study, it is essential to accompany with therapeutic Strategy to improve the HRQoL of ESRD patients on hemodialysis.
진당원(珍糖元)의 고혈당 조절 작용 및 기전에 관한 연구
김형준,윤철호,정지천,Kim, Hyung-Jun,Yoon, Cheol-Ho,Jeong, Ji-Cheon 대한한방내과학회 2004 大韓韓方內科學會誌 Vol.25 No.2
Objective : Diabetes is a disease in which the body does not produce or properly use insulin. Etiological studies of diabetes and its complications showed that oxidative stress might playa major role. Therefore, many efforts have been made to regulate oxygen free radicals for treating diabetes and its complications. Because Jindangwon has been known to be effective in treatment of diabetes, the methanol extract of Jindangwon was tested for its effectiveness in reducing the oxidative stress induced by Streptozotocin. Methods : Jindangwon was washed, dried in the shade and crushed. The crushed Jindangwon was extracted 3 times, each time with 3 volumes of methyl alcohol at $60^{\circ}C$ for 24 hours. The extract was filtered and evaporated under reduced pressure using a rotary evaporator to yield 30.6 g. Jindangwon extract was oral-administered to the diabetic rats induced by streptozotocin 50 mg per 1 kg of body weight for 15 days. The efficacy of the Jindangwon extract was examined with regard to the enzymatic pathways involved in the oxygen free radical production and the glutathione balance. Results : he effects of the methanol extract of Jindangwon in streptozotocin-induced diabetics rats with regard to body weight, blood glucose level, hepatic lipid peroxide level, hepatic xanthine oxidase activity and type conversion rate, hepatic glutathione level, hepatic glutathione peroxidase activity, hepatic glutathione reductase activity, hepatic aldose reductase activity, and hepatic sorbitol dehydrogenase activity were favorable enough to suggest that it is a cure for diabetes and its complications. Conclusions :These results support Jindangwon as an effective reducing agent for oxidative stress in the tissues and organs by regulating the production of oxygen free radicals. Jindangwon, in particular, shows promising results for its use as a cure, or preventative medicine for diabetes and its complications by reducing oxidative stress in beta-cells of the pancreas.
김형준,이정효,곽찬규,손원근,박원호,이택승,Kim, Hyung-Jun,Lee, Jung-Hyo,Kwak, Chan-Kyu,Son, Won-Keun,Park, Won-Ho,Lee, Taek-Seung The Korean Fiber Society 2006 한국섬유공학회지 Vol.43 No.5
Four copolymers of 9,9-dihexylfluorene and benzothiadiazole derivatives with or without quinoxaline were newly synthesized via Suzuki coupling reaction and characterized. The conjugated polymers with benzothiadiazole moiety in the main chain emitted green fluorescence, while their reduced polymers showed blue emission due to perturbation in the donor-acceptor structure. The polymers were spin-cast into thin films in the presence or absence of photoacid generator and well-defined fluorescence patterns were fabricated on the films by simple UV irradiation. The polymer was electrospun with poly(methyl methacrylate) to produce flexible fibrous mats. Fluorescence patterning was also conducted onto the electrospun fiber web to obtain a stable and flexible pattern without bending damage.
The effects of oxygen and hydrogen on the surface morphology of MgO films deposited by ion-plating
김형준,Jeong Jun Kim,Ki Bum Kim,Gi Sung Lee 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
The effects of oxygen and hydrogen on the surface morphology of MgO films, deposited by ion-plating, which is the protective layer of plasma display panels (PDP), were investigated. The surface morphology and crystalline planes were influenced not by the amount of oxygen but by the amount of hydrogen; the shapes and sizes of grains were changed from small triangles (50 nm), to large triangles (100-200 nm), to lozenge-shapes (100 nm), and then to very small (under 20 nm) round shapes with increasing amounts of hydrogen. The preferred orientations of the MgO films were (111) and (222) without hydrogen. However, (111) and (222) peaks decreased, and (200) planes appeared, with larger amounts of hydrogen. The crystallinity of the MgO film was hardly detected in the case when excess hydrogen (over 90 sccm) was introduced.
김형준,박영,조용현,조철진,김인철,Kim, Hyung-Jun,Park, Young,Cho, Yong-Hyeon,Cho, Chul-Jin,Kim, In-Chol 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12
The measurement of dynamic stagger in electric railways is one of the key test parameters to increase speed and maintain safety in electric railways. This paper is introduces a non-contact optical-based measuring instrument of a catenary system in electric railways. The instrument is implemented by utilizing a CCD (Charge Coupled Device) camera installed on the roof of a vehicle for vision acquisition and image processing techniques including the Canny edge detector and the Hough transform to detect contact wires and calculate dynamic stagger. To check the validity of our approach for the intended application, we measured stagger of a overhead wire of a Korea Tilting Train (TTX). The non-contact optical-based measurement system proposed in this paper performs real-time stagger measurement of an activated high-voltage contact wire. By results of this paper, the instrument should be applied to assess performance and reliability of newly developed electric railway vehicles.
이민기와 플루오렌기를 주쇄에 함유하는 고분자의 광기전 성질
김형준,이정효,곽찬규,진성호,이택승,Kim, Hyung-Jun,Lee, Jung-Hyo,Kwak, Chan-Kyu,Jin, Sung-Ho,Lee, Taek-Seung 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.1
New polyimine derivative containing fluorene group in the main chain was synthesized via Suzuki cross-coupling polymerization, reduction, and imine formation reaction, consecutively. The synthesized polymer was characterized and explored as organic photovoltaic cell device. The imine polymer P3 in diluted chloroform solution emitted red light (582 nm), whereas its precursor polymers P1 and P2 showed green (about 530 nm) and blue fluorescence (477 nm), respectively. Bulk heterojunction photovoltaic cells fabricated by blending P3 with the fullerene derivative PCBM was found to have a power conversion efficiency of upto 0.0005%, while cells from blending P3 with MEH-PPV yielded 0.0008% of power conversion efficiency.