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통일분류(統一分類)에 의한 우리나라 토질(土質) 공학적(工學的) 특성(特性)에 관한 확률론적(確率論的) 연구(硏究)
정철호,Chung, Chul Ho 대한토목학회 1989 대한토목학회논문집 Vol.9 No.3
본(本) 논문(論文)은 과거(過去) 13년간(年間)(1974~1986) 주택공사(住宅公社)가 전국(全國) 74개(個) 도시(都市), 176개(個) 주택단지(住宅團地)에서 실시(實施)한 제반토질시험결과(諸般土質試驗結果)를 통일분류법(統一分類法)에 의(依)한 흙의 종류별(種類別), 토질정수(土質定數)의 분산(分散)의 정도(程度)를 확률적(確率的)으로 분석(分析)한 것이다. 이 논문(論文)에서 분석(分析)한 토질정수(土質定數)는 자연함수비(自然含水比), 토립자(土粒子)의 비중(比重), 아터버그 한계(限界), 표준매입시험치(標準買入試驗値), 일축압축강도(一軸壓縮强度), 압축지수(壓縮指數) 그리고 강도정수(强度定數) 등(等)이다. 연구분석(硏究分析)한 결과(結果), 물리적(物理的) 저성질(藷性質)은 통계변수(統計變數)인 변동계수(變動係數)를 기준으로 하여 비교(比較)할때 변동(變動)의 범위(範圍)가 비교적(比較的) 적은 반면(反面)에, 강도정수(强度定數)는 40%, 압축지수(壓縮指數)는 32% 정도(程度)의 변동계수(變動係數)를 가지며, 비중(比重)은 사질도(砂質土)에서 0.87-2.49%, 점성토(粘性土)에서 0.91-5.03%로 분산(分散)의 정도(程度)가 매우 작음을 확인(確認)하였다. This paper probabilisticly analyses the variance of the soil parameters on kinds of soil by conducting statistical analysis through the Unified Soil Classification System. Data used are the result of soil test which the Korea National Housing Corporation conducted in 176 sites of 74 cities throughout the country during the past 13 years from 1974 to 1986. In this paper, soil parameters such as natural water contents, specific gravity of soil particle, Atterberg limits, N-values, unconfined compression strength, compression index and shear strength parameter etc., is analysed. The result of the analysis is as follows. 1) The variance in physical properties of the soil is, when compared with coefficient of variation which is statistical variable, comparatively small. 2) The shear strength parameter is proved to be about 40% and compression index is about 32%. 3) The variance in specific gravity is 0.87-2.49% in granular soil and 0.91~5.03% in cohesive soil respectively. So, the degree of the variance is very small.
단일기관에서 소화성 궤양을 진단 받은 투석 환자의 Helicobacter pylori 유병률
정철호 ( Chul Ho Chung ),김은정 ( Eun Jung Kim ),박무용 ( Moo Yong Park ),최수정 ( Soo Jeong Choi ),홍수진 ( Su Jin Hong ),김진국 ( Jin Kuk Kim ),황승덕 ( Seung Duk Hwang ) 대한신장학회 2011 Kidney Research and Clinical Practice Vol.30 No.2
Purpose: Patients with chronic renal failure tend to have an increased incidence of peptic ulcer disease. Helicobacter pylori ( H. pylori) infection is generally found to be the major cause of peptic ulcer disease. There are a few studies about the association between H. pylori and peptic ulcer disease in dialysis patients. In this retrospective study, we investigated the relationship between H. pylori and peptic ulcer disease in dialysis patients. Methods: The participants enrolled in this study were hemodialysis (HD) or peritoneal dialysis (PD) patients in the period from February 2001 to March 2010, who had been diagnosed as having a peptic ulcer. The presence of H.pylori was identified by at least one of the following: the rapid urease test, the urea breath test or histologic findings. Results: A total of 132 patients (100 HD and 32 PD patients) were enrolled. The mean age and duration of dialysis were 56.5±14.8 years and 27.6±45.3 months, respectively. The prevalence of H. pyloripositive patients amongst those with peptic ulcer disease was 43.1% (57/132). H. pylori-positive prevalence was 48.1% (38/79) in gastric ulcer patients, and 33.3% (11/33) in duodenal ulcer patients, but this difference was not significant (p=0.21). There were no significant differences in age, causes of chronic renal failure or dialysis method between the H. pylori-positive and H. pylori-negative groups. However, the duration of dialysis was significantly longer in the H. pylori-negative group (16.6±34.1 vs. 36.0±50.8 months, p=0.01). Furthermore, as the duration of dialysis increased, the prevalence of H. pylori infection decreased (p=0.004). Conclusion: There was little association between H. pylori and peptic ulcer disease in dialysis patients. Long-term dialysis appeared to decrease the prevalence of H. pylori infection in peptic ulcer disease.
정철호(Chul-Ho Jung),고재섭(Jae-Sub Ko),최정식(Jung-Sik Choi),전영선(Young-Sun Jun),김도연(Do-Yeon Kim),정병진(Byung-Jin Jung),정동화(Dong-Hwa Chung) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
The paper proposes a novel control algorithm for tracking maximum power of PV generation system. The maximum power of PV array is determinated by a insolation and temperature. Prior considered the term in PV generation system is how maximum power point is accurately tracked. The paper proposes a FNN(Fuzzy Neural-Network) control algorithm so as to accurately track those maximum power points. The proposed control algorithm comprises the antecedence part of fuzzy rule and clustering method, multi-layer neural network in the consequent part. FNN has the advantages which are depicted both high performance and robustness in Fuzzy control and high adaptive control in Neural Network Specially, it can show the outstanding control performance for parameter variations appling to non-linear character of PV array. In paper, the tracking speed and the accuracy prove the validity through comparing a proposed algorithm with a conventional one.
정철호(Chul-Ho Jung),이정효(Jung-Hyo Lee),이희준(Hee-Jun Lee),김영렬(Young-Real Kim),원충연(Chung-Yuen Won) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문에서는 태양광 모듈을 이용한 발전 시스템과 전기자동차용 양방향 배터리 시스템을 결합한 하이브리드 시스템을 제안 하였다. 병렬 구조를 가진 시스템을 전력제어 함으로써 배터리의 전력을 효율적으로 사용할 수 있다. 이에 따라 제안된 알고리즘의 타당성을 시뮬레이션 모델을 통하여 검증하였다.
국책 연구기관의 그린&스마트IT 수준 진단도구 개발 및 적용에 관한 연구
정철호(Jung, Chul-Ho),정택영(Chung, Taik-Yeong),조성남(Cho, Sung-Nam),김한국(Kim, Han-Gook) 한국전자상거래학회 2011 전자상거래학회지 Vol.12 No.4
본 연구는 최근 IT분야의 대표적인 추세라고 할 수 있는 그린&스마트IT의 조직 내 활용수준을 평가할 수 있는 그린&스마트IT 수준 진단도구의 개발과 이를 국책 연구기관에 실제로 적용해 보는데 연구의 초점을 두었다. 연구목적을 효과적으로 달성하기 위하여 관련 선행문헌들에 대한 종합적인 검토와 연구진 협의, 그리고 전문가 델파이 조사등의 과정을 통해 그린&스마트IT 수준 측정도구의 개발이 이루어졌으며, 개발된 측정도구를 국내 정보분석 및 유통 분야의 대표 연구기관인 K연구원에 적용하여 진단을 수행하였다. 본 연구의 결과를 토대로 새로운 IT환경변화인 그린&스마트IT의 추진 현황에 대한 객관성 있는 검토는 물론 이를 토대로 향후 조직의 그린&스마트IT 도입 및 추진에 대한 올바른 방향성 수립에 유용한 시사점을 줄 수 있을 것으로 기대한다. As the latest advancement and trend in IT field, Green & Smart IT has attracted more and more attentions from researchers. This study focuses on the development of diagnostic tools which could be used for evaluating Green & Smart IT level within an organization. The newly developed tool was also tried out within a state-run research institute. In order to achieve meaningful results, a comprehensive review of relevant literature was performed in advance, then, researcher’s discussion, delphi survey and other processes were also employed to develop the measurement tools for the evaluation of Green & smart IT level. Besides, K research institute, a representative institute in the field of information analysis and distribution in Korea, was chosen as the target in which the newly developed measurement tool was applied and an evaluation was also performed. This study provides an objective discussion on the present status of Clean & Smart IT. The findings presented in the study also provide organizations with useful implications for establishing a correct orientation for the introduction and promotion of Green & Smart IT in the future.