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이문용,정재학,곽철규 嶺南大學校 工業技術硏究所 2001 工業技術硏究所論文集 Vol.29 No.2
The research for development of remote monitoring and control system composed three stages of research categories. At the first stage, we decided the suitable instrumentation devices for interface between H/W systems and waste water treatment facility, and at the second stage. We developed the software package for remote monitoring system and data transmission system including data receipt system via wired telephone line. At the final stage we developed local control system for auto-process control of waste water treatment facilities. For the first stage of research we developed the a drawing of design the instrumentation and selected optimal sensors for monitoring basic important data. After the first stage research we developed the software package with Graphic User Interface with on-line real time data monitoring graphic view windows and data acquisition. Finally we developed the hardware, one-board microcomputer with CPU and suitable size of ram, and interface of modem. The developed system will be composed as a commercial product.
대뇌 백질변성과 고혈압 유형 : 안산 연구 the Ansan Study
박문호,박민규,박건우,신철,이대희 대한치매학회 2002 Dementia and Neurocognitive Disorders Vol.1 No.2
Background : it is known that white matter lesions (WMLs) may be related to hypertension. The relationship of WMLs to hypertension subtypes, however, remains uncertain Very few studies have been performed regarding WMLs in Korean people. We investigated the association beween the presence and the severity of WMLs with hypertension. its subtypes, and its control status among Koreans Methods : a population-based sample of the people aged older than 60 years in Ansan Cohort Study was selected, yielding 108 men and 115 women. Their blood pressure was measured using a highly standardized protocol Hypertension was defined according to 1999 WHO-ISH guidelines and its subtypes were subclassified Hypertensives were selected and they were subclassified as hypertensives. isolated systolic hypertensives, and isolated diastolic hypertensives. The subjects were further divided into antihypertensive medication and no medication groups WMLs were rated into 5 subgroups in terms of the presence and the severity by 2 raters using 1.5T MRI scan images. The correlation between WMLs and hypertension subtypes were made. Results : WMLs were realted to hypertension. For hypertension subtypes, systotolic blood pressure was more related to WMLs Among no medication groups with hypertension isolated systolic hypertensives (odds ratio [OR]=2.66, 95% CI=1.08-6.57,p<0.05) and hypertensives (OR=2.25, CI=1 19-5 46, p<0.05) were related to more extensive WMLs by multiple regression analysis Among antihypertensive medication groups, uncontrolled hypertension (OR=6.07, CI=2.08-17 78, p<0.01)was significantly related to WMLs compared to normotensives. Conclusions : Hypertension is a strong independent n나 factor of WMLs among Koreans. Regular and tight control of hypertension apperars to be of great importance in preventing WMLs in hypertensives.
Wide Range ZVS Phase Shift Full Bridge Converter with Low Conduction Loss
Young-Do Kim,Kyu-Min Cho,Duk-You Kim,Byoung-Hee Lee,Chol-Ho Kim,Gun-Woo Moon 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The conventional phase shift full bridge (PSFB) converter is widely used for front-end DC/DC stage of distributed power system (DPS). However, hold-up time requirement limits its operating duty ratio in normal operation and it results in the increase of conduction loss in conventional PSFB converter. Therefore, wide range ZVS PSFB converter with low conduction loss is proposed in this paper. The proposed converter adopts the large resonant inductor and replaces clamp diodes in conventional PSFB converter with MOSFET switches. With this modification, the proposed converter can achieve the ZVS operation over wide load range as well as can reduce the conduction loss of switches caused by the circulating current. There advantages result in the improvement of whole load efficiency. The operational principle and analysis of proposed converter are presented and verified by the 1.2㎾ prototype.