• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.953-957
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• 2005

Light Rail Transit(LRT) Systems with transport capacity between subway and bus(5,000-25,000 persons per hour) are being carried on over 100 lines around the world. In Korea, to solve the urban transportation problem, the introduction of LRT system has been proceeded positively. It is planned to develop the Korean standard LRT system in which safety, efficiency and cost effectiveness are emphasized. So we were able to make proto type of Rubber tired AGT system for LRT. This is capable of driverless operation using CBTC(Communication Based Train Control) of Moving Block System and is currently making an experiment for reliability in test-line. This study is focused on verifving the train tracking with CBTC in driverless and ATO mode through implementing the examination.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.1282-1288
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• 2006

Upon demands for the requests of rapid, safe and comfort transit, the proven high speed bogie having not only high-quality but also good running performance is required by customer all over the railway vehicle for narrow gauge. Hereupon, the running test on roller testing rig for developed semi-high speed bogie for narrow gauge was carried out in order to verify the running performance and safety. The aim of the test is to assess the dynamic behaviour of the bogie on straight track including the running stability, ride quality, modal frequency and dynamic response.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.264-269
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• 2005

Light Rail Transit(LRT) Systems with transport capacity between subway and bus(5,000-25,000 persons per hour) are being carried on over 100 lines around the world, In Korea, to solve the urban transportation problem, the introduction of LRT system has been proceeded positively. It is planned to develop the Korean standard LRT system in which safety, efficiency and cost effectiveness are emphasized. So we were able to make proto type of Rubber tired AGT system for LRT. This is capable of driverless operation using CBTC(Communication Based Train Control) of Moving Block System and is currently making an experiment for reliability in test-line. This study is focused on verifving the performance of CBTC system for driverless and ATO mode through implementing the examination.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.107-111
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• 2008

This paper presented a literature review and investigation analysis results of total 19 present guide book and provisions of maintenance and management system in existing railway bridges to development of urban maglev track structures inspection manual. This research carried out a cooperated research subject 3-1, development a design code and maintenance and management inspection manual for urban maglev track structures, of the Center for Urban Maglev Program. Three types of track structures were includes as a major analytical parameter together with railroad, high speed railroad, subway and light rail transit. Bridges were analyzed a general rules, investigation, evaluation, repair and strengthen method as a key aspect. And rail were analyzed examination and maintenance also. This analysis results show that the track structures evaluation are based on the test and examination results, and repaired or strengthened consideration of deterioration, track irregularity and materials according to provision requirements.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.864-869
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• 2008

Magnetic Levitated(Maglev) Vehicle, which utilizes electromagnetic forces between dual-pole electromagnets and a steel rail, generally runs on guideway structures. A prototype of an Urban Maglev Vehicle has been developed and tested in Korea, This study was conducted as a cooperation research subject of the 3-1 subject, performance improvement of maglev track structures, of the Center for Urban Maglev Program, statred in 2006. As the Maglev load is distributed rather than concentrated, a field test was conducted on Simple Span PSC-BOX Girder Bridge(L=25.0m) of the Expo-Maglev test track in Daejeon to examine the dynamic effect of the Maglev load on the bridge. Numerical analyses were also performed up to the maximum passing speed of 110 km/h by 10 km/h increments of Maglev Vehicle using Finite Element model of bridge, and girder deflections, accelerations and Dynamic Amplification Factor (DAF) are analysed.

• 대한한의학방제학회지
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• 제28권1호
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• pp.71-80
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• 2020

Obejectives : The purpose of this study was to investigate the effects of Yijin-tang on pacemaker potentials of small intestinal interstitial Cells of Cajal (ICC). Methods : To dissociate the ICC, we used enzymatic digestions from the small intestine in mice. The electrophysiological whole-cell patch-clamp configuration was used to record pacemaker potentials in the cultured ICC and the in vivo effects of Yijin-tang on GI motility were investigated by calculating percent intestinal transit rates (ITR). Results : 1. The ICC generated pacemaker potentials in the murine small intestine. Yijin-tang produced membrane depolarization with concentration-dependent manners in the current clamp mode. 2. Pretreatment with a Ca²⁺ free solution and thapsigargin, a Ca²⁺-ATPase inhibitor in the endoplasmic reticulum, stopped the pacemaker potentials. In the case of Ca²⁺-free solutions and thapsigargin, Yijin-tang did not induce membrane potential depolarizations. 3. U73122, a phospholipase C (PLC) inhibitors, blocked the Yijin-tang-induced membrane potential depolarizations. However, U73343, an inactive PLC inhibitors, did not block. 4. In the presence of protein kinase C (PKC) inhibitors, staurosporine or Rottlerin, Yijin-tang depolarized the pacemaker potentials. However, in the presence of Go6976, Yijin-tang did not depolarize the pacemaker potentials. 5. In mice, intestinal transit rate (ITR) values were significantly and dose-dependently increased by the intragastric administration of Yijin-tang. Conclusions : These results suggest that Yijin-tang can modulate the pacemaker activity of ICC through an internal/external Ca²⁺ and PLC/PKC-dependent pathway in ICC. In addition, Yijin-tang is a good candidate for the development of a prokinetic agent.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.171-173
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• 2018

대중교통 운전자들의 열악한 근무 환경은 근로자의 정신적 스트레스와 피로누적을 초래할 뿐만 아니라 대중교통 사고의 주요 원인과 직결된다. 스트레스와 피로누적은 심리적, 육체적으로 건강에 영향을 미치기 때문에 생체신호와도 밀접한 연관성을 가진다. 본 논문에서는 심전도와 맥박 수, 체온을 측정하여 운전자의 건강상태를 파악할 수 있는 디지털 의류를 설계하였다. 또한, 이상이 있을 경우를 가정하여, 측정된 생체신호를 블루투스를 통하여 스마트폰 앱으로 전송하고 스마트폰 내장 GPS를 활용하여 운전자의 현재 위치를 서버로 전송해주는 시스템을 제안하였다.

• 대한공간정보학회지
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• 제22권1호
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• pp.41-46
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• 2014

버스노선은 수요에 대응하여 탄력적인 노선조정이 가능하다. 다만 버스의 노선 조정은 다음과 같은 문제점의 해결이 선행되어져야한다. 첫 번째, 현재 버스 노선 배정의 가장 큰 문제점은 버스의 이용현황을 적절히 고려하지 못한 점, 중복노선 문제 등 수요에 대비한 공급의 불균형을 들 수 있다. 두 번째, 버스이용은 지리적 공간 내에서 일어나는 상호작용 있어서 동단위로 교통 수요를 예측함으로써 교통 수요가 세분화 되지 못한 문제점이 있다. 이러한 문제점들의 해결방안으로 GIS-T Data 및 지리적 가중 회귀분석을 통한 버스 정류장, 버스 노선의 버스 잠재 수요를 파악하고 공급 현황을 분석하여 버스의 수요와 공급의 균형여부를 파악함으로써 효율적 버스 노선을 구축할 필요가 있다. GWR모델을 이용하여 공간적 수요관계를 도출하였다. 공간효과를 고려한 GWR모델을 통해 SCD와 BIS data 이용한 버스 수요를 예측하고 공급과 비교하여 공급 부족을 파악하였다. 전체노선의 노선 과잉지과 부족지역을 파악하였다. 이를 통해서 추가 노선배정이 필요한 곳을 분석하여 버스 최적화를 도모와 GIS의 장점인 시각화를 시도하였다.

• 대한공간정보학회지
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• 제23권3호
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• pp.77-84
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• 2015

본 연구의 핵심적인 목적은 유동인구 분포의 공간 패턴의 영향요인 분석을 위한 공간회귀모형 적용의 효용성을 검토하는 것이다. 이를 위해 서울시 유동인구 조사 자료를 활용하여 조사지점별 유동인구의 전역적, 국지적 공간 자기상관 측정을 실시하였다. 그 결과 분석에 적용된 공간자기상관 측도인 Moran's I, Getis-Ord-$Gi^*$ 그리고 Local Moran's I 모두에서 통계적으로 유의한 수준의 공간적 유사성과 이질성이 발견되었다. 이를 근거로 유동인구분포와 토지이용 특성과의 관계를 파악하기 위한 통계적 모형으로 공간회귀모형인 지리가중회귀모형(GWR : Geographically Weighted Regression, 이하 GWR)을 채택하였다. 모형의 설명변수로써 서울시 전체에 대한 400m*400m 격자망기반에 토지이용혼합도, 주거 밀도, 상점밀도, 녹지 밀도와, 추가적으로 각 격자별 버스노선밀도, 교차로 밀도, 교통 결절점 접근성, 평균 도로폭, 평균 보도넓이를 산출 및 집계 하였다. 동일한 방식으로 격자망에 집계된 유동인구 정보와 토지이용 및 교통 특성과의 GWR모형 결과를 Ordinary Least Square(OLS) 분석 결과와 비교한 결과 GWR모형의 주요 통계량 수치에서 개선된 결과를 도출하였다. 또한 구획된 격자망의 각 셀별로 도출된 GWR모형의 추론 결과를 검토한 결과 적용된 설명변수의 유동인구 분포에 대한 효과가 국지적으로 변동하는 양상을 파악할 수 있었다.

• 동아시아식생활학회지
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• 제27권5호
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• pp.548-557
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• 2017

This study investigated the effects of insoluble dietary fibers from pine (Pinus radiata D. Don) inner bark powder (PIBP) on loperamide constipation in rats. Male Sprague-Dawley rats were administered PIBP in their diets at concentrations of 5% and 10% for 4 weeks. Rats were divided in to four groups, normal diet group (Cont), a normal diet and loperamide group (Lop), 5% PIBP experimental diet and loperamide group (Lop+PIBP 5%), and 10% PIBP experimental diet and loperamide group (Lop+PIBP 10%). Constipation was induced by oral administration of loperamide (2 mg/kg, twice per day) for the last three days of the experiment. Food intake, body weight, properties of feces, gastrointestinal transit time, and serum lipid profiles were measured. When compared with the normal diet and loperamide group (Lop), there were increases in fecal pellet number (p<0.05), wet weight (p<0.001), and water content (p<0.001). Positive results were derived from relevant indicators to improve constipation. In addition, the number of fecal pellets in the colon was not significant, and decreased as PIBP content increased. PIBP had a concentration-dependent effect on reduction of total cholesterol, LDL-cholesterol, and triglycerides and elevation of HDL-cholesterol. These results indicate that PIBP may effectively prevent constipation.