원심펌프 방식 수중발사 시스템의 동특성 해석

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.

음성부력을 갖는 연습탄의 수면부양 방안 연구

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.

방사선 그래프트 중합에 의하여 제조된 폴리(아크릴 산)이 그래프트된 탄소나노튜브에 생체분자 고정화에 관한 연구

정찬희(Chan Hee Jung),이병민(Byoung Min Lee),황인태(In Tae Hwang),최재학(Jae Hak Choi),노영창(Young Chang Nho),홍성권(Sung Kwon Hong) 한국고분자학회 2010 폴리머 Vol.34 No.2

일부 지역 성인의 비타민 D 상태와 복부지방 및 심혈관계 위험과의 관계 (대한비만학회지 2015;24:30.5)

정찬희 ( Chan Hee Jung ) 대한비만학회 2015 The Korean journal of obesity Vol.24 No.2

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)

논평 : 급성심근경색 발생과 내장지방조직 및 아디포카인과의 연관성

정찬희 ( Chan Hee Jung ) 대한비만학회 2013 The Korean journal of obesity Vol.22 No.3

접근성 인자가 고려된 Space Syntax 모형의 보행량 분석

정찬희(Jung Chan-Hee),최무혁(Choi Moo-Hyuck) 대한국토·도시계획학회 2010 國土計劃 Vol.45 No.5

This research aims to examine the foot traffic volume in downtown Daegu with the 'Integration' obtained through the analysis using Space Syntax. Especially, our analyze will give the weight on determinant factors that may be significant in 'integration' in order to obtain valuable meanings connected with detail in 'integration' in order to obtain valuable meaning connected with detail Purpose, improving inconsistency of Space syntax. Concretely, the south block of Gukchaebosang-street showed a high degree of 'Global integration', which was confirmed to have some meaning with foot traffic volume. And the fact that there is a great difference in street integration between the south and north based on Guchaebosang-street, explains a big difference in foot traffic volume; thus, it is expected that this could be a data for realizing the importance of street planning with high street integration henceforth. Furthermore, this research intended to confirm that the weight & virtual axial lines given based on the access number of people are influenced accessibility factors, such as department stores, and commercial district, etc. The correlation of statistical analysis becomes higher by giving weight and manipulating virtual axial line. It is expected that such a study method will be helpful to more feasible estimation of traffic volume.

계절에 의한 뱀장어 성분 분석

정찬희(Jung, Chan-Hee),홍철희(Hong, Cheul-Hee) 한국외식산업경영학회 2012 외식산업경영연구 Vol.8 No.1

분석내용을 요약하면, 수분함량은 여름 65.4%, 겨울 63.0%로 큰 차이는 보이지 않았고, 회분함량도 여름 1.2%, 겨울 1.1%로 거의 비슷한 것으로 확인되었다. 지질함량은 여름 뱀장어가 12.1%, 겨울 11.8%로 나타났으며, 단백질함량은 여름 18.0%, 겨울 16.7%로 조사 되었다. 일반적인 분석에서는 여름철이 겨울철보다 전체적으로 약간 높게 나타났으나 큰 차이는 보이지 않았다. 핵산관련성분 함량 중 가장 많은 함량을 차지한 것은 Hx로 여름철 3.912 µmol/g 으로 나타났고, 겨울철에 3.097로 나타났다. 그리고 두 번째로 높게 나타난 것은 HxR로 여름철 2.422 µmol/g 이고, 겨울철 1.800 µmol/g 나타났다. 어육의 맛의 주성분이라고 알려진 IMP의 함량은 여름철이 0.240 µmol/g 으로 나타났으며, 겨울철에 0.207로 나타났다. 여름철과 겨울철의 핵산관련성분의 함량 변화를 살펴보면, 여름철이 더 높은 함량을 보였다. 포화 지방산과 불포화 지방산의 대략적인 비율은 29.63%와 70.37%로 나타났다. 지방산에 대한 조성비의 차이는 MUFA 중 oleic acid의 비율은 여름철 46.27%, 겨울철에서는 26.15%로 대략 2배정도 낮게 나타났다. PUFA 중 겨울철 EPA는 7.61%는 여름철 2.42보다 많은 비율로 나타났으며, DHA의 비율은 겨울철에 16.98%, 여름철에 10.19% 보다 높은 비율로 나타났다. 주요 유리아미노산은 threonine, histidine, lysine, glutamic acid, glycine 등이었으며, 특히 threonine의 함량은 여름철 83.7 mg/100g로 겨울철 49.1mg/100g보다 높게 나타내었다. 유리 아미노산 함량은 여름이 514.2 mg/100g 으로 높게 나타났고, 겨울에는 349.8 mg/100g으로 나타났다. 뱀장어의 필수 아미노산의 함량은 여름철 363.5 mg/100g 이었고, 겨울철에 202. 7mg/100g 으로 여름철에 많은 함량을 보이고 있다. 쓴 맛을 내는 아미노산인 arginine은 여름철에 9.7 mg/100g이 나타났고 겨울철에 22.4 mg/100g로 여름철에 적게 나타났다. In general analysis, there wasn’t a remarkable difference between data measured in summer and winter, although data measured in summer seemed to be slightly higher than the other. What covers the highest proportion of ingredients related to nucleotides is Hx, and its amount in summer is appeared to be 3.912 µmol/g and amount in winter is 3.097 µmol/g. Contents of IMP which was known as the main ingredient of fish’s flavor is turned out to be 0.240 µmol/g and amount in winter is 0.207 µmol/g. Examining the change in ingredients related to nucleotides, the amount of ingredients in summer is appeared to be more higher than in winter. The approximate ratio of saturated fatty acids is 29.63% and that of an unsaturated one is about 70.37%. The proportion of oleic acids among MUFA in winter, which shows the difference in the component ratio of fatty acids, is turned out to be 26.15%, that is about half of 46.27% measured in summer. The ratio of EPA among PUFA is 7.61% in summer, which is higher than 2.42% in winter, and the proportion of DHA is 16.98% in winter, which is higher than 10.19% in summer. The amount of free amino acids in summer is approximately 514.2mg/100g, which is relatively higher than 349.8mg/100g in winter. In addition, the amount of essential amino acids in summer is about 363.5mg/100g, that is much higher than 202.7mg/100g in winter. Then, the amount of arginine, which is a kind of amino acids that has bitterness, is appeared to be 9. 7mg/100g in summer, which is lower than 22.4mg/100g in winter.

대구시 도심부 가로발달 양상과 이에 대한 Space Syntax분석

정찬희(Jung Chan-Hee),최무혁(Choi Moo-Hyuck) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.10

The purpose of this study is to know aspects of the development of streets in Daegu city and to offer the clue of the expected methods of developing street. Space Syntax program will be used in the process of analysing the development of streets in Daegu city for time series analysis. The results of this study are as follows; While each axis of newly developed streets is affected by axis of old narrow streets in old town, each axis of newly developed streets in newly developed town on farmlands near the old town went for an axis of railroad, axes of cross lines and etc. When a new road was planned in street plan in order to divide a big block, almost narrow streets and conventional streets usually were taken into consideration. So, the axis of the new road easily went for one of axes of near narrow streets. The 'integration' on these grid roads in center of Daegu was high. But, the numerical value usually was decreased in the process of developing new streets in the outline of Daegu city. Especially, the integration and connectivity of the road in front of Daegu railroad station, Taepyeongno, was high. It may be significant cause about land rises in value near the road. We can find also that the change of integration on conventional streets was connected with newly formed streets.

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.