• 대한지리학회지
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• 제45권5호
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• pp.592-608
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• 2010

본 연구는 수도권 광역도시철도 이용에서의 통행 연쇄 패턴으로 구분한 이용자 집단 특성과 총 이용 빈도 및 시간대 별 이용빈도로 구분한 역 집단 특성 간의 관계를 분석함으로써 수도권 광역도시철도 역 이용의 일반 특성을 규명하였다. 이를 위해 2005년도 6월 하루 동안 수도권 광역도시철도 전체 357개 역을 이용한 274만여 명의 역 이용지를 11개 통행 연쇄 패턴으로 구분하고, 이 중 2통행 수 이하의 단순 통행 5개 패턴에 해당하는 240만여 명의 통행 자료를 분석하였다. 분석 결과 이용객 수 및 시간대 별 출발 및 도착 비율에 근거하여 4개의 역 집단 구분이 가능하였으며, 특히 역 집단 간에는 계층적 구조가 존재함을 알 수 있었다. 또한 하루 동안의 역 이용 빈도가 역 집단 별로 일관된 차이를 보이는 것은 모든 이용자 집단에 있어 동일하나, 시간대 별 이용 비율은 역 이용자의 최초 통행의 도착역이 최종 통행의 출발역과 같은가 여부, 최초 통행의 출발역이 최종 통행의 도착역과 같은가 여부 등에 따라 달라짐을 알 수 있었다.

• 한국철도학회논문집
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• 제18권6호
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• pp.586-595
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• 2015

최근 Hong et al.[1]은 같은 열차에서 하차한 승객들의 교통카드데이터 퇴장시각이 군집(cluster)을 이루어 나타나는 특성을 이용해 도시철도 승객의 실제 이용 경로와 열차를 추적하는 방법론을 제시하였다. 본 논문에서는 급행열차와 일반열차가 혼합 운영되는 서울 지하철 9호선에서도 퇴장시각이 같은 특성을 보임을 확인하고 Hong et al.[1]의 방법론을 사용하여 승객이 실제 이용한 열차를 추적하였다. 오전 시간대(6시~10시) 상행 승객에 대한 추적결과 전체 승객 중 91% 승객에 대해서 성공하였다. 이 결과를 바탕으로 일반열차와 급행열차에 대한 승객의 선호 및 이용행태를 분석하였다.

• Environmental Engineering Research
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• 제15권3호
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• pp.173-179
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• 2010

Pasig River is an important river in the Metro Manila, Philippines, since it provides food, livelihood and transport to its residents, and connects two major water bodies; Laguna de Bay and Manila Bay. However, it is now considered to be the toilet bowl of Metro Manila due to the large amount of wastes dumped into the river. Even with the efforts of the government to revive the quality of the Pasig River and its tributaries, it continues to deteriorate over time. This paper provides an overview of the current condition of the Pasig River. The existing water management policies were reviewed, and the issues and challenges hindering the improvement of its water quality identified. Moreover, the water qualities of the rivers in Metro Manila were compared to those of the major rivers in South Korea. The current watershed management system practiced by South Korea has been discussed to serve as a guideline for future recovery of the water quality of the rivers in the Philippines.

• Journal of information and communication convergence engineering
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• 제7권4호
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• pp.480-488
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• 2009

A channel-shared modified accelerative pre-allocation wavelength division multiple access (CMAP-WDMA) media access control (MAC) has been proposed for metro-WDMA networks, as an extension of modified pre-allocation wavelength division multiple access (MAP-WDMA) MAC protocol. Similarly, CAP WDMA as an extension of accelerative pre-allocation wavelength division multiple access (AP-WDMA) MAC protocol. Performance of CMAP- and CAP-WDMA was extensively investigated under several channel sharing methods (CSMs), asymmetric traffic load patterns (TLPs), and non-uniform traffic distribution patterns (TDPs). The result showed that the channel utilization of the CMAP-WDMA always outperforms that of CAP-WDMA at the expense of longer channel access delay for channel shared case while CMAP-WDMA provided higher channel utilization at specific network conditions but always shorter channel access delay than CAP-WDMA for non-channel shared case. Additionally both for CMAP- and CAP-WDMA, determining an effective CSM is a critical design issue because TDPs and TLPs can be neither managed nor expected while CSM is manageable, and the CSM supporting the best channel utilization can be recommended.

• 한국정밀공학회지
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• 제28권4호
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• pp.427-435
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• 2011

This paper deals with the measurement and analysis of the squeal noise according to the curvature of rail. The squeal noise is generated by the friction between the railway with curve and the wheel. The squeal noise is a big problem in Busan Metro Line 3. If the developing panel type ANC(Active Noise Control) system which is attached to the floor can reduce 5 dB in below 500 Hz, the sound pressure level of the whole band pass can be reduced about 4-4.8 dB in squeal noise above the curvature of R400. Curve squeal noise is the intense high frequency tonal that can occur when a railway vehicle transverses a curve. The frequency range is from around 500 to almost 20,000 Hz, with noise levels up to about 15 dB in curve.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 추계학술발표대회 논문집
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• pp.361-366
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• 2009

Amid the crisis of global climate change, interest in low carbon and energy-saving building has been increasingly growing. Korea is likely to be designated as one of the countries subject to CO2 reduction under the 'Post-2012 Climate System' The efforts to minimize the building energy has been made and in line with the increasing need of low carbon and eco-friendly building, a demand for building evaluation programs has been on the rise. However, the metro logical data which is necessary for such program has not been effectively provided and moreover, the source, calculation method and period remain uncertain. This study was intended to evaluate the regional typical metro logical data (ISO TRY) provided by Korean Solar Energy Society and compile the month of test reference years (TRY), and analyze the regional weather using dry-bulb temperature, wet-bulb temperature and solar irradiance which are regarded the representative metro logical data.

• 대한안전경영과학회지
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• 제17권3호
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• pp.65-79
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• 2015

This study intended to investigate exploratorily the precedent factors affecting two types of perceived balances between work and life(family/leisure) and the antecedent ones affected by them, focusing on the metro train drivers. To attain this purpose, literature survey on the precedent factors, work-life balance, and antecedent factors was performed, and the study model was designed based on this survey, and then this model was analyzed empirically using Multiple-Regression. The results on the precedent factors showed that Job Demand, Self-Efficacy, and Age have significant effects on the negative transfer of work. On the other hand, it was shown that Affiliative Culture, Self-Efficacy, and Internal Locus of Control have significant effects on the family centered balance. And the results on the antecedent factors showed that family centered balance has significant effects on Job Satisfaction, Psychological Depression and Fatigue, Safety Behavior, and accident, and the negative transfer of work has significant effects on Physical and Psychological Depression and Fatigue, Emergency Stress, and Safety Behavior.

• Journal of the Optical Society of Korea
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• 제8권2호
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• pp.55-58
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• 2004

Several internal wavelength locker schemes for 10 Gbps electro-absorption modulated laser EML) module were reviewed. 10 Gbps EML modules with simple and robust internal wavelength ockers for metro dense WDM application were successfully demonstrated. The wavelength aging ver 2000 hours was done at elevated temperature of 7$0^{\circ}C$. The average wavelength drift of 10 modules was measured to be about $\pm$ 5 pm. These modules can be successfully applied to the 0 Gbps DWDM systems with 50 ㎓ channel spacing.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.283-285
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• 2003

Metro is taking an important part as a public transportation of densely populated area. but according to request of increasing transportation demand and improving service for passengers, minimizing headway, functional improvement of safety facility, improving riding comfort are needed. Also, it is the time for Seoul metro's signalling system to be improved into a new one as it has been opened to traffic for over 20 years and its signalling system is becoming superannuated. this paper reviewed the considerations at improving a signalling system and its solution.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.58-68
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• 2007

철도차량 옥상 정비시 산업재해를 방지하기 위해서는 안전성을 확보한 철저한 준비 및 검토가 선행 되어야한다. 차량의 정비시 공정별 위험요소 및 제반 문제점을 도출하여 해결함으로써, 산업 재해를 방지 할수 있다. 차량의 중 정비시 추락 재해는 옥상 작업인 차량의 옥상에서 발생한다. 정비의 특성상 차량을 분리하고, 차량의 대차를 분리 한후, 받침대 위에 차량을 올려놓은 상태에서, 옥상 작업은 안전 시설의 효과적인 설치 및 활용이 어렵다. 4M 에 의한 분석을 통하여, 옥상 작업시 차량의 지붕에 안전 난간을 설치하여, 추락 재해를 방지하고, 심리적 불안감을 해소하여, 안전하게 작업할 수 있는 방안을 연구 하였다.