• Title/Summary/Keyword: Urban Block

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An analysis on the headway of urban rail transit (도시철도 시스템에서의 운행 시격 분석)

  • Bang, Yung;Kim, Hyung-Hoon;Um, Jung-Kyou;Cho, Yong-Gi
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.1495-1500
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    • 2006
  • A signal system is critical point of transport capacity and train operation in urban rail transit. Today the moving block system by radio is taking place of the fixed block system by track circuit for efficiency and short headway in underground railway and right rail transit. In this study, assuming specification of a train, track and control system, the minimum headway on the moving block system and the fixed block system is researched for the maximum transport capacity.

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A Study on the Driving Regulation of the Urban Railway Vehicles with Block Systems (폐색방식에 따른 도시철도차량운전 분류기준에 관한 연구 - 용어의 합리적인 개정을 중심으로 -)

  • Jeon, Y.S.;Lee, H.S.;Kim, C.S.
    • Journal of the Korean Society for Railway
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    • v.13 no.1
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    • pp.92-98
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    • 2010
  • Block system has been used to protect trains from occupying the same section of track at the same time so that only one train is permitted in each block at a time. Domestic driving regulations on the block system is divided into two classifications, such as regular block and substitute block. If it is impossible to use this regulation, the block applied method can be applied. However, domestic urban railway administrator has established his own operation rule within the regulation. Therefore, in order to assure continuous safety of train in operation, it is necessary to strengthen the regulation as can cope with the various block systems. In this study, domestic urban railway administration's own rules are examined and the appropriate driving regulation on the block system is proposed.

Strength properties of concrete permeability blocks using polymer PVA (폴리머 PVA 사용에 따른 콘크리트 투수블록의 강도 특성)

  • Lee, Won-Gyu;Pyeon, Su-Jeong;Yoo, Byeong-Yong;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.29-30
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    • 2018
  • Recent impervious pavements on roads and sidewalks cause rainwater to not penetrate into the ground, deplete groundwater, or flood the rivers, causing urban flood damage. In order to solve these problems, the amount of installed pitcher block is increasing, but the existing pitcher block is made with cement base and causes many problems. In the cement permeable block, the efflorescene phenomenon occurs due to the acid component, and the pore of the permeable block is clogged and the permeability is lost. As a result, the service life of the pitcher block is shortened and the replacement period is shortened. The purpose of this study is to analyze the basic properties of polymer concrete by replacing cement with polymer in order to solve the problem of cement - based concrete permeable block.

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A study on the commercialization cause of 2nd class residential area in urban center (도시거점내 제2종 일반주거지역 상업화 확산과 원인 분석)

  • Yoon, Yong-Suk;Yang, Woo-Hyun
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • 2011.04a
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    • pp.147-152
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    • 2011
  • The purpose of this study is to find out the commercialization cause of 2nd class residential area in urban center as basic research to protect urban residential area against the pressure of commercialization. Through the research that are based on literature, field survey and urban planning map, it analysed the commercialization cause of selected two sites under similar urban condition ; to be a nearby subway station and to be a famous commercial street in site, etc. The consequences of this study are summarized as follows ; First the distance between subway station and residential block and residential commercialization are in inverse proportion each other. Second, the corner lot of a block and the access street directly connected collector street are very important factors to spread commercialization to residential area. Finally, nevertheless first and second results, there is square zone which is very high rate of commercialization within one regardless the distance between subway and residential block. the maximum range of square zone is assumed about 250 meter based on case study.

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Analysis on the Runoff of Urban Watershed using MIKE SWMM Model (MIKE SWMM모형을 이용한 도시유역 유출분석에 관한 연구)

  • Kim Jong Seok;Choe Gyeong Rok;Ahn Jae Hyun;Moon Young Il
    • Proceedings of the Korea Water Resources Association Conference
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    • 2005.05b
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    • pp.862-866
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    • 2005
  • For urban watershed models, the ILLUDAS and SWMM are the popular rainfall-runoff models used in Korea. However, combined sewage systems in urban areas produced problems when a flood occured because of the surcharged precipitation amount which drained to the streams directly. Also, the lack of pipe line data and the difficulties of modeling yield inappropriate modeling results in urban runoff analysis. In addition, rainfall-runoff models in urban areas which use channel routing could have inaccurate and complicated processes. In this paper, the MIKE SWMM model has been applied for the stable runoff analysis of urban areas. Watershed and pipe line data were established by using past inundated records, DEM data, and the numerical pipe line data. For runoff modelings, the runoff block was adapted to a basin and the Extran block using dynamic equations was applied to the sewage system. After comparing to models that exist, it is concluded that the MIKE SWMM model produces reliable and consistence results without distorting the Parameters of the model.

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Runoff Analysis of Urban Watershed using MIKE SWMM Model (MIKE SWMM 모형을 이용한 도시유역 유출분석에 관한 연구)

  • Kim, Jong-Suk;Ahn, Jae-Hyun;Oh, Tae-Suk;Moon, Young-Il
    • Journal of Korea Water Resources Association
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    • v.38 no.11
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    • pp.907-916
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    • 2005
  • For an urban watershed modeling, the ILLVDAS and SWMM model were the popular rainfall-runoff models using in Korea. However, combined sewerage systems in urban area produce some problems when a flood event happens because of the surcharged precipitation amounts which drain to streams directly. Also, rack of pipe line data and difficulties of modeling yield inappropriate modeling results in urban runoff analysis. In addition, rainfall-runoff models in an urban which using channel routing could be inaccurate and complicated processes. In this paper, the MIKE SWMM model has been applied for a stable urban area runoff analysis. Watershed and pipe line data were established by using past inundated records, DEM data and numerical pipe line data. For a runoff modeling, the Runoff block was adapted to a basin and the Extran block using dynamic equation was applied for sewerage system. After a comparisons against existing models yield that the MIKE SWMM model produce reliable and consistence results without distorting parameter of the model.

A Study on Bundang-line Urban Transit Operation Mode and Operation Algorithm Analysis of an ATC System (분당선 도시철도 운전모드와 ATC 시스템 동작알고리즘에 관한 연구)

  • Kim Jong-ki;Lee Key-soe
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.1247-1252
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    • 2004
  • ATC(Automatic Train Control) system employed in Bundang urban transit is operated in accordance with automatic blocking equipment. Using AF(Audio Frequency) track circuits installed at a block section, the block signal is automatically controlled and the safety of train operation is supported. In this paper, we investigate the operation mode of bundang urban transit and analyze the operation algorithm of ATC on-board system.

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A Study on the Application of Low-Rise and High-Density Multiple Dwelling Housing Model in Urban Individual Residential Area - Focused on Ui-dong Public Detached Housing Area - (도시단독주택지 저층고밀형 집합주택 모델의 적용에 관한 연구 - 우이동 국민주택단지를 대상으로 -)

  • Jun, Byung-Kweon
    • Journal of the Korean housing association
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    • v.22 no.3
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    • pp.101-111
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    • 2011
  • This study was conducted to investigate the indiscriminate development occuring as a result of high-density land use per lot in residential areas of Seoul, which mainly consist of detached houses. The primary goals of this study were: (1) to suggest a block unit development method as an alternative architectural method of the current uniform development, in which high-rise and high-density apartments are usually built; and (2) to check the feasibility of the suggested method. Based on the analyses of the existing block composition types of residential areas, the prerequisite planning indices for applying a collective housing model were investigated. Subsequent to applying a collective housing type within each unit block, the collective housing model was analyzed. The results of the analyses showed that indiscriminate development was rampant in detached urban houses areas, and more than 70% of the buildings constructed before the 1980s needed re-development. The feasibility of the models was investigated depending on the models of low-rise and high-density collective housing, which utilize various block arrangements such as the court type, linear type, villa type, and composite type. The results of this study showed that the newly applied low-rise and highdensity multiple dwelling housing model in urban individual residential area significantly contributed to creating a good living environment in terms of both physical and psychological aspects.

An optimal mix design of sound absorbing block on concrete ballast in urban train tunnel (도시철도 터널내 콘크리트 도상용 흡음블럭의 최적 배합설계)

  • Lee, Hong-Joo;Oh, Soon-Taek;Lee, Dong-Jun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.18 no.1
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    • pp.75-82
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    • 2016
  • As spreading of train concrete ballast leads to the increase resounding friction noise, an porous sound absorbing block is applied in urban train tunnel as a counterparts against the friction noise. Three steps of major variables tests for an optimal mix design of the block are conducted to pursue the light weight of the block. Pilot property tests of the block for the cases of the fly-ash only as lightweight aggregates are carried satisfying KRT(Korean Rail Transit) and new KRS(Korean Railway Standards). Based on the results of pilot tests, required structural strength and admixture effects are evaluated. Additionally, typical lightweight aggregates are replaced so that lightweight and strength are improved for serviceability of poor working conditions and proper maintenance in urban train tunnel.

Transformation of Urban Spatial Structure around the Old Castle in Cheong-ju City (구 청주읍성 일대 도시공간구조의 변용 양상)

  • Kim, Se Jin;Kim, Tai-Young
    • Journal of the Korean Institute of Rural Architecture
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    • v.15 no.1
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    • pp.89-96
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    • 2013
  • This study aims to clarify the transformation of urban spatial structure around old castle in cheong-ju city. The urban spatial structure is composed with road system, block division, and lot system with original cadastral map in 1913 and 2011 GIS. Transformation of road system is classified into control of road line, construction and extension of road. Construction of arterial road was divided into Nam-juro and Mang-sunro with 2 blocks and lot system was destoyed. Transformation of block has not been developed except 4 blocks. The 4 blocks were divided into east-west or north-south direction and became 8 blocks. Transformation of lot system is classified into maintained, subdivided, and destroyed lots in shape and size of lots. Maintained lots were found in large lot in size for public office and park. Subdivided lots were mainly represented with the existing main road, an active alleys, and so on. Destroyed lots by road construction and extension were showed in Nam-juro. Although all these transformations are used to enhance urban spatial structure. The old systems have remained around old castle in cheong-ju city.