• International Journal of Safety
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• v.7 no.1
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• pp.39-43
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• 2008

With ever increasing number of citizen using subway stations everyday, safety, health and comfort of passengers and occupants (mostly metro personnel) have become important social issues. Considering the fact that various physical variables and pollutants such as particulate, VOCs and biological agents are closely related to indoor air quality (IAQ) which may cause health problems, a method of quantitative assessment using information-theoretic measure on such variables needs to be devised and implemented for comfort, health and safety of passengers and occupants in the subway station. A basic framework for assessing indoor air quality (for comfort and health) and safety in subway station is suggested. In particular, application of information-theoretic measure for the assessment of indoor air quality, comfort and safety in subway station is discussed. Some examples are presented as well.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.04a
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• pp.59-60
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• 2002

20세기 기술의 발달과 산업화에 따라 세계 각 국에서는 인간이 제어하기 힘든 거대 규모의 도시가 계속하여 형성되고 있다. 전 세계 대도시들 중 대기오염도가 심한 도시의 하나에 속하는 필리핀의 Metro-Manila는 1975년 11월 마닐라를 중심으로 총 13개 소도시와 4개의 자치지구가 통합되어 구성되었으며, 면적은 서울(605.5$\textrm{km}^2$)과 비슷한 636.0$\textrm{km}^2$이다. 인구 밀도는 약 15,617명/$\textrm{km}^2$로 서울(17,046명/$\textrm{km}^2$)보다는 다소 낮고, 전체 인구수는 서울과 유사한 약 1천만 명 정도이다. (중략)

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.27 no.2
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• pp.134-139
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• 1998

• Proceedings of the KSR Conference
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• 2006.05b
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• pp.1134-1150
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• 2006

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.10a
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• pp.817-818
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• 2009

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.631-633
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• 2005

본 논문에서는 MEF(Metro Ethernet Forum) 기술 문서를 기반으로 메트로 이더넷 망을 위한 보호 기술을 소개하고 메트로 이더넷 망을 위한 링크 보호 알고리즘을 설계한다. 제안한 링크 보호 알고리즘은 각 서비스가 요구하는 링크 복구 시간(restoration time)을 고려하여 백업 경로를 미리 설정하는 방법과 장애가 발생한 이후에 우회 경로를 설정하는 방법을 사용한다. 백업 경로를 미리 설정함에 따라 자원의 이용률이 감소하므로 이를 해결하기 위하여 백업 경로 간 자원의 공유 방법을 도입하였으며, 서비스 특성에 따라 복구 경로에서 제한된 QoS를 제공하도록 하여 망의 가용성을 증가시일 수 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.287-290
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• 2014

보편화된 카드 사용은 현금 사용과 달리 지출의 파악이 어려워 과소비를 조장한다. 불필요한 지출을 줄여 합리적인 소비활동을 위해서 본 논문에서는 카드 결제 시 수신 받는 SMS를 통합적으로 관리하여 결제 내역을 분석할 수 있도록 해주는 카드 결제내역 관리 앱을 제안한다. 터치환경에 적합한 Metro UI를 메인화면에 사용하여 메인에서 모든 메뉴로의 접근을 가능하게 하였고, 사용 내역을 수동으로 입력하지 않아도 SMS를 자동으로 분석하여 쉽고 빠르게 이용 가능하다.

• Proceedings of the KSR Conference
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• 2003.10c
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• pp.236-246
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• 2003

This paper is implemented a control algorithm in order to be stable and minimized to entire train traffic system at delayed case. Signal ing system is described wi th algebraic equations given for train headway, Discrete-event simulation principles are reviewed and a demonstration block signaling model using the technique is implemented. Train congestion at station entrance for short headway operation is demonstrated and the propagation of delays along a platform of trains from any imposed delay to the leading train is also shown. A rail way signaling system is by nature a distributed operation with event triggered at discrete intervals. Although the train kinematic variables of position, velocity, and acceleration are continually changing, the changes are triggered when the trains pass over section boundaries and arrive at signals and route switches. This paper deals with linear-mode1ing, stability and optimal control for the traffic on such metro line of the model is reconstructed in order to adapt the circuits. This paper propose optimal control laws wi th state feedback ensuring the stability of the modeled system for circuits. Simulation results show the benefit to be expected from an efficient traffic control. The main results are summarized as follows: 1. In this paper we develop a linear model describing the traffic for both loop lines, two state space equations have been analyzed. The first one is adapted to the situation where a complete nominal time schedule is available while second one is adapted when only the nominal time interval between trains is known, in both cases we show the unstability of the traffic when the proceeding train is delayed following properties, - They are easily implemented at law cost on existing lines. - They ensure the exponetial stability of loop system. 2. These control laws have been tested on a traffic simulation software taking into the non-linearites and the physical constraints on a metro line. By means of simulation, the efficiency of the proposed optimal control laws are shown.

• Earthquakes and Structures
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• v.17 no.4
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• pp.411-424
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• 2019

In this study, a numerical model of a shield tunnel with an assembled segmental lining was built. The seismic response of the segmental lining of the section of the shield tunnel in Line 1 of the Chengdu Metro is analyzed as it passes through the interface of sand-cobble and mudstone layers. To do so, the node-stress seismic-motion input method was used to input the seismic motion measured during the 2008 Wenchuan earthquake, and the joint openings and dislocations associated with the earthquake action were obtained. With reference to the Ethylene-Propylene-Diene Monomer (EPDM) sealing gaskets used in the shield tunnels in the Chengdu Metro, numerical simulation was applied to analyze the contact pressure along the seepage paths and the waterproof property under different joint openings and dislocations. A laboratory test on the elastic sealing gasket was also conducted to study its waterproof property. The test results accord well with the numerical results and the occurrence of water seepage in the section of the shield tunnel in Line 1 of the Chengdu Metro during the 2008 Wenchuan earthquake was verified. These research results demonstrate the deformation of segmental joint under earthquake, also demonstrate the relationship between segmental joint deformation and waterproof property.

• Journal of the Korean Society of Safety
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• v.37 no.4
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• pp.58-62
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• 2022

Metro subway construction is a field that requires a great deal of professional manpower. The aging of professionals has a negative impact on both productivity and health, owing to poor working environments, heavy lifting, underground work, and other factors. To address this issue, the government is progressively revising and enforcing health management law and regulation in the construction industry. Thus, the job stress and work ability of many professional subway construction workers, who are rapidly aging, are being analyzed to ensure their safety and improve their health. In this study, the Macpa stress index of Busan Metro Subway construction workers from Sasang to Hadan line was measured by using a Macpa measurement machine, and a work ability survey was conducted by using the questionnaire that was developed by the FIOH. The independent variables were age, years of service, job position, employment type, and occupation. While, the dependent variables were the Macpa stress index and work ability. The Kruskal-Wallis test was used because it was difficult to assume that the statistics of this study represented a normal distribution. The results showed that age, job position, and employment type affected Macpa stress index and revealed that as the age of the workers increased, their stress levels increased as well. Additionally, job position and employment type affected the work ability of the metro subway construction workers. In terms of job position, the technical engineers were under a lot of stress, and whereas the managers had the best work ability. The technical engineers were more stressed than the other workers because of a poor working environment. In terms of employment type, daily workers were under more stress and lower work ability than others.