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신희철,김동준,정성엽,문장원,Shin, Hee-Cheol,Kim, Dong-Jun,Jeong, Seong-Yub,Moon, Jang-Won 한국토지주택공사 토지주택연구원 2011 LHI journal of land, housing, and urban affairs Vol.2 No.2
비효율적인 자동차 중심의 교통체계에서 효율적인 친환경 인간중심의 교통체계로의 전환이 필요하다. 특히 무동력, 비탄소 교통수단 중 생활교통수단으로 활용이 가능한 자전거에 대한 중요성이 인식되면서, 최근 우리나라 뿐만 아니라 전 세계적으로 자전거 이용활성화를 위한 노력을 기울이고 있다. 그러나 우리나라의 경우 자전거 이용활성화에 대한 부정적 인식과 함께 자전거 수단분담률은 1.2%로 자전거 선진국에 비해 매우 낮은 수준이다. 이러한 배경하에 본 연구에서는 우리나라 자전거 이용활성화 가능성을 진단하고, 자전거이용이 활성화된 자전거 선진도시의 사례 분석을 통해 자전거 이용활성화 결정요인을 도출하였다. 또한 자전거의 특성을 고려하여 도시 유형을 구분하고, 자전거 인프라 확충 측면의 결정요인별 중요도를 제시하였다. 자전거 이용률 및 보유율, 기술 발전, 경제적 측면, 통행거리 및 목적, 공공자전거 도입 등 7가지 항목에 대해 우리나라 자전거 이용활성화 가능성을 진단한 결과, 잠재적 가능성이 존재하는 것으로 나타났다. 다음으로 자전거 선진도시 사례를 통해 자전거 인프라 확충 측면, 안전 및 이용활성화 측면, 지속가능성 확보 측면 등 3개 분야의 총 41개 결정요인을 도출하였다. 이와 함께 자전거를 고려한 도시 유형을 구분하고, 자전거 인프라 확충 측면의 21개 결정요인별 중요도를 제시하였다. Automobile-oriented urban transport system, continued from the past in Korea, is giving rise to inefficiency and social costs in transport sector. With revitalizing usage of bicycle, human-powered transport mode, it is possible to enhance sustainable green growth, improvement of the city-competitiveness, and the quality of life. In this study, the possibility of bicycle usage promotion in Korean cities is examined at 7 points of views. As a result, though the bicycle usage is low now, we figured that there are many positive signs to increase bicycle usage in Korea. Also, we draw a diverse key policies for building green urban transport system that bicycle have a most important role on transport system. So policies to promote bicycle usage are reviewed to analyze on bicycle-oriented 5 cities, in which have high bicycle mode share. By this review, this study could draw 41 key effective policies to 3 aspects (bicycle infrastructure, safety and promotion, and policy sustainability). In addition to, importance of 21 key effective policies about bicycle infrastructure is suggested as considering city's characteristics.
신희철,문석배,이성철,정성은,박귀원,Shin, Hee-Chul,Moon, Suk-Bae,Lee, Seong-Cheol,Jung, Sung-Eun,Park, Kwi-Won 대한소아외과학회 2009 소아외과 Vol.15 No.1
The survival of Very Low Birth Weight (VLBW) infants has been improved with the advancement of neonatal intensive care. However, the incidence of accompanying gastrointestinal complications such as necrotizing enterocolitis has also been increasing. In intestinal perforation of the newborn, enterostomy with or without intestinal resection is a common practice, but there is no clear indication when to close the enterostomy. To determine the proper timing of enterostomy closure, the medical records of 12 VLBW infants who underwent enterostomy due to intestinal perforation between Jan. 2004 and Jul. 2007 were reviewed retrospectively. Enterostomy was closed when patients were weaned from ventilator, incubator-out and gaining adequate body weight. Pre-operative distal loop contrast radiographs were obtained to confirm the distal passage and complete removal of the contrast media within 24-hours. Until patients reached oral intake, all patients received central-alimentation. The mean gestational age of patients was $26^{+2}$ wks ($24^{+1}{\sim}33^{+0}$ wks) and the mean birth weight was 827 g (490~1450 g). The mean age and the mean body weight at the time of enterostomy formation were 15days (6~38 days) and 888 g (590~1870 g). The mean body weight gain was 18 g/day (14~25 g/day) with enterostomy. Enterostomy closure was performed on the average of 90days (30~123 days) after enterostomy formation. The mean age and the mean body weight were 105 days (43~136 days) and 2487 g (2290~2970 g) at the time of enterostomy closure. The mean body weight gain was 22 g/day after enterostomy closure. Major complications were not observed. In conclusion, the growth in VLBW infants having enterostomy was possible while supporting nutrition with central-alimentation and the enterostomy can be closed safely when the patient's body weights is more than 2.3 kg.
유한용량 자동생산 시스템의 효율적인 운용을 위한 시뮬레이션 기반 2단계 은행가 알고리즘(BA) 설계 및 성능분석
신희철,최진영,Shin, Hee Chul,Choi, Jin Young 한국시뮬레이션학회 2012 한국시뮬레이션학회 논문지 Vol.21 No.4
본 논문에서는 유한 용량 자동생산 시스템의 효율적인 운용을 위하여 기존에 제안된 은행가(BA) 알고리즘의 단점을 개선시킨 2단계 Look-ahead 은행가 알고리즘을 제안하였다. 제안된 알고리즘은 각 job 단위 별 전체 남은 공정의 처리 가능성뿐만 아니라 job들 간의 부분적인 이동 가능성을 동시에 고려하여 시스템 내부에 존재하는 job들의 완성 가능성을 결정함으로서 기존 알고리즘의 안전 상태 식별 능력을 향상시켰다. 수치 실험을 통해 제안된 알고리즘의 향상된 성능을 (i) 안전 상태 탐색율과 (ii) 시스템 Throughput을 기준으로 확인하였으며, paired t-test를 통해 검증하였다. This paper suggests a two-phase look-ahead Banker's algorithm for efficient operation of capacitated automated production systems. The algorithm improves the ability of detecting safe states of the previous one by considering the possibility of processing each job to completion at once as well as partial movement between jobs. The improved performance of the proposed algorithm is testified by performing numerical experiment in terms of (i) detection rate of safe states and (ii) system throughput and verified by using paired t-test.
기업간 관계형성의 영향요인이 기업성과에 미치는 영향에 관한 연구
신희철(Hee-Chul Shin),신한원(Han-Won Shin),최영로(Young-Ro Choi) 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.5
본 연구는 기업간 거래관계에서 관계형성 영향요인의 개념을 도입함으로써 관계형성 영향요인이 매개변수를 통하여 관계성과의 향상에 주요하다는 점을 밝히고자 하였다. 따라서 본 연구모형의 기본틀을 선행변수, 매개변수, 성과변수로 구성하였다. 선행변수인 관계형성요인은 거래적 특성요인, 관계적 특성요인, 환경적 특성요인 등 세 가지로 구분하고 이들이 매개변수인 신뢰(Trust)의 관계몰입(Relationship commitment)을 통하여 성과변수인 기업성과(積載率-Load Factor)향사에 미치는 영향을 해운서비스 매매기업간 마케팅 시스템의 문헌적, 실증연구를 통하여 검증하였다. The purpose of this research is to introduce the concept of “relationship formation factors” in inter-firm relations and to empirically demonstrate that they are effective in improving the relationship results by means of an mediating variable. Therefore, the basic model of this study consists of the independent, mediating, and dependent variables. First, the independent variables, that is, the relationship formation factors, are further classified into three components transactional, relational, and environmental characteristics Then, the study empirically examines how each of the three components influences the dependent variable, that is, the business performance(Load Factor), by way of the mediating variables, that is trust and relationship commitment.
Doppler 초음파를 이용한 정상임신주수에 따른 태아제대동맥 혈류속도파형의 변화양상
신희철(HC Shin),윤보현(BH Yoon),김승욱(SW Kim) 대한산부인과학회 1989 Obstetrics & Gynecology Science Vol.32 No.3
서울대학교병원 산부인과를 내원한 정상임산부의 제대동맥에서 doppler초음파검사를 시행하 고 임신의 결과가 정상으로 확인된 104명의 임산부에서 시행된 188회의 검사결과를 임신주 수에 따라 분석하였다. 제대동맥의 혈류속도파형은 최고수축기속도(A)와 이완기속도(B)의 비 (A/B ratio), pulsatility index(PI), resistance index(RI)의 3가지 지표를 사용하여 분석하였다. 임신 14주이하에 검사가 불가능하였던 경우는 없었으며 임신이 진행됨에 따라서 A/B ratio, PI, RI모두 감소하여, 임신이 진행됨에 따라서 태반의 저항이 감소하여 제대정맥의 이완기말 의 혈류속도파형의 변화양상이 확립되었으며 앞으로 태아의 산전건강평가에 유용한 지표로 사용될것으로 여겨진다. Time-velocity waveforms or sonograms obtained by pulsed doppler ultrasound from the umbilical artery were analysed in the fetuses from 104 normal pregnancy women. One hundred eighty-eight determinations were carried out from the 13th to the 41th weeks of pregnancy. The ratio of peak systolic to end-diastolic flow velocity pulsatility index of a ratio overcomes the obstcle of not knowing the angle between the incindence beam and the direction progressively, indicating a gradual fall in resistance in the umbilical-placental circulation in normal pregnancy. The analysis of umbilical artery blood flow velocity waveforms provieds a new and non-invasive measure of fetoplacental blood flow resistance and has the potential of being an important aid in prenatal care.
신희철(HC Shin),김관수(KS Kim) 대한산부인과학회 1984 Obstetrics & Gynecology Science Vol.27 No.9
The majority of papers written on the subject of the pregnancy in women over forty have stressed the decline in physiological activity and efficiency in this group of patients, coupled with an increased incidence of medical complications giving rising to a high fetal mortality. Relationship between maternal age and the frequency of dysfunctional labor paterns was assessed retrospectively in a population of 5604 gravid women. Five hundred women among 5108 gravidas aged below 35 were used as a control group. The results obtained are as followings: 1. The pregnant women aged over 40 were 54 cases among total 5604 gravid women. The incidence of distribution ranged between 40 and 49 yrs among pregnant women aged over 40. 3. Concerning antepartal complications the incidence of PROM was 16.7% in pregnant women aged over 40 comparing with 9.4% in the control group. The incidence of hypertensive disorder was 11.2 comparing with 5.6% in the control group. 4. There were increased incidence of both low and high birth weight infants. 5. Neonal mortality rate was 148 comparing with 56 in the control group.