• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.843-848
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• 2005

Currently the train traffic control system is built wholly by one package construction. It is under variable circumstance such as variation of signalling equipment and station expansion. This condition reduces system reliability and availability. And the term of system change is longer than 10 years, so it is hard to update to the latest technology and the new function. In order to do the system should be replaced to new one completely. The step by step construction of ADS(Autonomous Decentralized System) is one of the solution. So the simulation of it on the real station help to find system requirement and verify good of online expansion and online test.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1641-1646
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• 2007

Subway station is installed with equipment of deficient ventilation and air purification in need of routine activity for users because projectors didn't have recognition of the importance of prevention equipment on disasters in subway stations. So if the accident in Deagu is occurred again, we can't prevent it. And it is urgently necessary to improve antique subway station for the safety and service to citizens because users were increased far more. Improvement of subway station has to be modernized the backward and antique subway station and maintained and developed by the center of traffic to give the social contribution with management of social facilities. And subway station has to be made conveniently so that everyone may use the station with one-stop system including sales, business, service equipment. This study will show the improvement plan of problem in underground space and situation of metropolitan-train history to improve metropolitan-train station .we will study a traffic line and equipment relocation of underground space considering safety by choosing the improved station and problems of the underground station in seoul. And then we will study the improvement plan of air purification and sound isolation to upgrade service in citizens.

• Mycobiology
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• 제28권3호
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• pp.158-162
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• 2000

Twenty-three isolates of Fusarium spp. were obtained from decayed citrus fruits in the fields and storages in 1998-1999. Of them, six and five isolates belonged to F. proliferatum and F. moniliforme, respectively, which were the most common. F. solani and F. sambucinum had each two isolates, F. equiseti had one isolate and seven isolates were unidentified. They produced symptoms of two types in pathogenicity test: those with leathery, beige to light or dark brown, and sunken lesions without surface mycelium (type-1) and those with lesions covered with white, beige or pink surface mycelium (type-2). Four of six isolates identified to F. proliferatum and two unidentified isolates produced type-1 lesions, and all isolates identified to F. moniliforme, F. solani, F. sambucinum, F. equiseti and five unidentified isolates produced type-2 lesions.

• 대한건축학회연합논문집
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• 제20권6호
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• pp.63-70
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• 2018

This study is aimed to reflect the current status survey, analysis and response of 10 railway stations using geographical names in one of 19 stations located on Gyeongbu, Honam and Chungbuk line. Most railway stations in the study have shown normal images that are close to the standard type by selecting similar building materials rather than reflecting geographical features. Aside from the shape of the traditional Korean house in Cheongju, almost all newly constructed stations tend to incorporate light gray plating material on their modern exterior to produce Family look design as a railroad station. According to a survey of the sensitivity of the station's name, Osong Station was 73.6 percent, Gyeryong Station 67.3 percent, Heukseok-ri Station was 64.5 percent, Shintan-jin 62.6 percent, and Yeonsan Station 57 percent, more than half. Therefore, the results of the five stations were presented as a calculation and proposed design release focusing on the facades of each station. Each of these stations suggested a way to express the facade design image, considering the railway operation status of Korea Railroad, the area of the station and other surroundings.

• 대한공간정보학회지
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• 제15권4호
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• pp.89-96
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• 2007

터널시공현장에서 중요한 요소가 되는 미굴량과 여굴량, 그리고 내공변위 및 천단침하에 대한 자료는 대부분 변위계와 토탈스테이션에 의해 취득되어진다. 그러나 이러한 장비들은 다수의 작업자를 필요로 하고, 대상지점에 직접 접근하여 타겟이나 계측기를 설치해야 되는 등 여러 가지 불편함과 위험요소를 안고 있다. 최근에 개발된 리모트컨트롤 무프리즘 토탈스테이션은 이러한 단점을 해소할 수 있는 여러 가지 기능을 가지고 있다. 따라서 본 연구에서는 무프리즘 토탈스테이션과 제어용 노트북 컴퓨터 등을 조합하여 터널계측을 위한 1인 측량시스템을 구성하고 그 효율성을 평가하고자 하였다. 이를 위해 시공 중인 터널을 대상으로 기존의 측량방법과 본 연구의 측량방법으로 각각 관측을 수행하고 관측 소요시간, 정확도 등을 비교하였고 그 결과 본 연구의1인 무프리즘 측량시스템이 기존의 방법에 비해 효율적임을 입증하였다.

• 한국작물학회지
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• 제39권5호
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• pp.453-457
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• 1994

본 시험은 1990년 11월부터 1992년 11월까지 국내에서 수집된 시호 6계통과 일본에서 도입된 삼도종을 공시하여 생육특성, 근수양성 및 saikosaponin 함량을 조사한 것으로 그 결과를 요약하면 다음과 같다. 1. 재래종 시호의 개화기는 1년생이 8월 2∼3일, 2년생은 7월 16∼18일로, 1년생보다 2년생이 일찍 개화하였으며, 일본도입종인 삼도종은 국내 수집종에 비하여 1년생은 18일, 2년생은 32일각각 늦게 개화하였다. 2. 초장 및 경태에서 춘천종은 초장이 크고 경태가 굵은 편이었으며 삼도종은 다분지형이었다. 3. 근장, 근태 및 지근수는 국내 수집종간에는 큰 차이가 없었으나 삼도종은 뿌리가 굵고 짧으며 지근이 적은 경향이었고, 건근수량은 1, 2년생모두 춘천종이 높았으며, 2년생근의 10a당 평균수량은 105Kg으로 1년생근에 비해 2.6배를 보였다. 4. Saikosaponin 함량면에서 춘천종은 1, 2년생근 모두에서 높은 편이었고, saikosaponin 조성에서는 국내 재래종이 일본에서 도입된 삼도종보다 약리활성이 높은 saikosaponin a 및 d의 함량비율이 높아 품질이 우수한 것으로 나타났다.

• 한국수정란이식학회지
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• 제24권1호
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• pp.71-76
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• 2009

It is not easy for porcine embryos produced by in vitro systems to develop into blastocysts with high quality. To solve this problem, many researchers have developed novel culture methods. However, the formation of blastocysts with high quality is still low. In this study, we aimed to produce piglet following transfer of in vitro produced early embryos ($2{\sim}4$ cell stage embryos) or morula and blastocyst. The $2{\sim}4$ cell stage embryos were transferred to five estrus-synchronized recipients (200 embryos per recipient). One of the five sows farrowed three piglets, which contain two live piglets and one dead piglet, 114 days after embryo transfer. However, two recipients transferred with morula and blastocysts did not farrow. Microsatellite analysis confirmed that the genomic DNA of two live piglets were not genetically identical to that of the recipient. These results indicate that it is possible to obtain piglets by transfer of early embryos produced by in vitro production (IVP) systems.

• 한국항공우주학회지
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• 제34권9호
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• pp.60-66
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• 2006

현재 개발 중인 통신해양기상위성은 남쪽면에만 태양전지판이 장착되어 있기 때문에 태양복사압에 의하여 누적되는 모멘텀을 줄이기 위해 휠오포로딩을 정기적으로 수행해야 한다. 일반적으로 정지궤도 위성은 경도와 이심률을 보정하기 위해서 2번의 위치유지 기동을 매 주기마다 수행하는데, 본 논문에서는 기상센서와 해양센서의 충분한 관측시간을 확보하기 위해서 2번의 동서위치보정 기동 중 1번의 기동을 휠오포로딩과 동시에 수행될 수 있다. 선형 궤도기동 방정식을 적용하여 기동시각과 기동크기를 얻었다. 이렇게 구한 기동을 적용하여 수치적분으로 시뮬레이션을 수행하였다. 또한 이를 휠오프로딩과 동시에 수행하지 않는 일반적 방법과 비교 검토 하였다.

• 산업경영시스템학회지
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• 제42권3호
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• pp.61-69
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• 2019

The concept of carsharing involves sharing a small number of reserved cars to be used individually by a larger number of people as required. This study examines the operating parameters of one-way carsharing systems in order to determine the appropriate operating conditions that minimizes the lost sales rate. Five operating parameters are tested in this study: the number of stations, the average number of vehicles per station, the rate of one-way trip, the average number of staffs per station, and the relocation policy. The performance of round-trip carsharing systems is also compared to that of one-way carsharing systems. A simulation model is developed and simulations are performed to determine the appropriate combination of operating parameter and levels. The simulation results show that the average number of vehicles per station is the most critical parameter. Other key findings obtained from this research are as follows. First, applying the appropriate relocation policy to one-way carsharing systems can allow more customers to rent vehicles than the traditional round-trip carsharing systems. Second, the appropriate relocation policy should be selected based on the average number of vehicles per station in order to minimize the lost sales rate. Third, the number of stations does not affect the lost sales rate. This study findings will provide tools to understand impact of the carsharing system parameters on the efficiency of the carsharing operations.

• 한국철도학회논문집
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• 제10권6호
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• pp.670-677
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• 2007

본 연구에서는 1920년 신축되어 등록문화재 제 136호고 등록된 경의선 신촌역사의 건축적 특징을 중심으로 1920년 개설이후 현재에 이르기까지의 변천과정을 살펴보고자 한다. 신촌역사는 서울에서 현존하는 가장 오래된 역사로 역사적, 문화적 가치를 지니고 있고 그와 동시에 개발에 대한 가능성을 통시에 지니고 있었다. 이에 따라 신촌역사는 도심지 내 개발과 보존에 대한 갈등의 성격을 그대로 보여주고 있다. 본 연구는 신촌역사를 중심으로 척도관련시설의 개발과 보존에 대한 현상과 문제점을 진단하고 이에 대한 방향을 찾고자 하였다.