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정찬희,최장섭,김기언,강명구,이정준,Jung, Chan-Hee,Choi, Jang-Seob,Kim, Ki-Un,Kang, Myung-Koo,Lee, Jeong-Jun 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.2
In this study, in terms of the exercise vehicles of the weapon systems having negative buoyancy, the analysis on the operation concepts was performed and the new methods of floating to surface were proposed. In case of having negative buoyancy, the additional methods for recovering the exercise vehicle have to be considered. As parts of recovering the exercise vehicle, for floating to surface the new methods of weight discharge, weight separation and sea water discharge were proposed. The conceptual design about sea water discharge method was performed. It was confirmed that those methods could be applied to the design of the exercise vehicle having negative buoyancy.
정찬희,박인기,Jung, Chan-Hee,Park, In-Ki 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.5
In this study, the mathematical model of the underwater discharge system using a centrifugal pump was derived and the rotating speed profiles of the pump which satisfied the discharge performance requirements were obtained through the underwater discharge simulations. The simulation results showed that the dynamic characteristics of a projectile were greatly affected by the rotational speed of the pump, however, hardly by the discharge depth. It is anticipated that the simulation model can be used to derive the design parameters and analyze the performance concerning the underwater discharge system using a centrifugal pump.
정찬희,이정우,류동일,Jung, Chanhee,Lee, Jungwoo,Yoo, Dong Il 한국염색가공학회 2022 韓國染色加工學會誌 Vol.34 No.2
Natural colorants are regarded as substitutes for synthetic colorants in the fields of fiber dyeing, hair dyeing, cosmetic, and food industries. The use of natural colorants has been increased in view of global environment and sustainability. However, scientific approach to the production is required because the supply of natural colorants depends on the climate, soil, and cultivation methods. This brief review contains the advances in science and technology related to natural colorants including characterization, analysis, CIEL<sup>*</sup>a<sup>*</sup>b<sup>*</sup> and Munsell color systems, and future prospects. For the characterization and the analysis of natural colorants, chromatography, some spectroscopic techniques (UV-Vis, FT-IR, NMR), mass spectrometry, and X-ray diffraction are generally used.
한국인에서 갑상선기능에 따른 지질 , hsCRP , 허리둔부비와 같은 심혈관질환의 위험인자의 변화
정찬희(Chan Hee Jung),성기철(Ki Chul Sung),신헌섭(Hun Sub Shin),이현영(Hyun Young Lhee),박승하(Seung Ha Park),이호철(Ho Chul Lee),이은정(Eun Jung Rhee),이원영(Won Young Lee),김범수(Bum Soo Kim),강진호(Jin Ho Kang),김선우(Sun Woo Kim) 대한내과학회 2002 대한내과학회지 Vol.63 No.3
Background : Thyroid abnormalities affect a considerable portion of the population. Overt hypothyroidism is associated with an elevated risk of cardiovascular disease and adverse changes in blood lipids. Subclinical hypothyroidism is also associated with an increase risk of cardiovascular disease. So we performed the study to investigate the prevalence of overt and subclinical thyroid disorders and their association between cardiovascular risk factors. Methods : This study was performed in 66,260 subjects (43,588 men, 22,672 women ; between 20∼80 years of age, mean age 41.5±9.6). Serum free thyroxine (FT4), thyroid stimulating hormone (TSH), total cholesterol, low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol (HDL-C) were measured with RIA using commercial kits. High sensitivity C-reactive protein (hsCRP) were measured with nephelometry. Results : The prevalence of overt thyrotoxicosis, subclinical thyrotoxicosis, overt hypothyroidism and subclinical hypothyroidism was 5/1000 (334 subjects), 6.4/1000 (426 subjects), 1.6/1000 (108 subjects), 6.4/1000 (375 subjects) population. Mean plasma total cholesterol and LDL-C were elevated in overt hypothyroidism than normal (202.1 mg/dL and 121.8 mg/dL versus 197.1 mg/dL and 120.1 mg/dL)(p<0.05). Also in subclinical hypothyroidism, mean total cholesterol and LDL-C level were elevated compared to normal group (201.9 mg/dL and 123.7 mg/dL)(p=0.015, p=0.047). Waist-to-hip ratio (WHR) was lower in overt thyrotoxicosis and was higher in hypothyroidism. Conclusion : The prevalence of thyroid dysfunction was not significantly different from those of other countries. It was also age dependent and higher in women but it was lower than expected. Patients with hypothyroidism exhibit higher levels of waist-to-hip ratio as index of obesity. Patients with subclinical hypothyroidism exhibited increased levels of the atherogenic parameters (Total cholesterol, LDL-C). Therefore screening and treatment for subclinical hypothyroidism may be warranted due to the adverse effects on lipid metabolism.(Korean J Med 63:273-282, 2002)
대구시 도심 부도심정책이 도시공간발달에 미친 영향에 관한 연구
정찬희(Jung Chan-Hee),윤재훈(Yoon Jae-Hoon),최무혁(Choi Moo-Hyuck) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.11
This study aims to examine the development of spatial structures of sub-CBD and CBD in Daegu city. After analysing the history of sub-CBDs and CBD planning in Daegu city, we examined the relationship between data of Space-syntax in each sub-CBD, CBD and commercial center area. For this study, distribution patterns of Sub-CBD were sought for by using the calculated data such as 'Integration' from Space syntax program, S3. The main findings are as follows. Planning of sub-CBDs in Daegu city was revised according to the urban expansion since 1965. From 1969 to 2006, the locations of sub-CBDs have been transferred to outer heart of a living sphere(1971) and were planned in order to increase the urban efficiency. After all, sub-CBDs of Daegu city were located near a fourth circular road in 2006. We came to know lessons from measuring through Space syntax program, which are below. The land price of each land in CBD and sub-CBDs were affected by the accessibility of near road, and by the calculated data such as 'Integration'. Because it is significant the fact that the land price of each sub-CBD, commercial center area were related with the data from Space Syntax Program, the space syntax analysis reveals the effective indication for the urban planning. It seems that the data of 'Global Integration' in each sub-CBDs, CBD, commercial center areas may be regarded as a growth indication of its land.