• Title/Summary/Keyword: cities

Search Result 5,637, Processing Time 0.027 seconds

A Study on the Disaster Safety Management and Standardization Trends (재난·안전 관리 및 표준화 동향에 관한 연구)

  • Kang, Heau-Jo
    • Journal of Advanced Navigation Technology
    • /
    • v.13 no.5
    • /
    • pp.799-804
    • /
    • 2009
  • In this paper, disasters are increasing rapidly due to increase of population, giantish of cities, advancement of traffics, and abnormal weather phenomena, and the scale of damages is also getting wider. So we study of the disaster safety management system and find recognition comprehensions and the problem points which are basic in our system. We dedicate this research on improvement analysis and main discussion issues of the system that based on diagnostics in developed countries' system. And Disaster management activities are increasing to efficiency through the disaster standardization trend.

  • PDF

Seismic vulnerability and preservation of historical masonry monumental structures

  • Dogangun, Adem;Sezen, Halil
    • Earthquakes and Structures
    • /
    • v.3 no.1
    • /
    • pp.83-95
    • /
    • 2012
  • Seismic damage and vulnerability of five historical masonry structures surveyed after the 1999 Kocaeli and Duzce, Turkey earthquakes are discussed in this paper. The structures are located in two neighboring cities that have been struck by five very large ($M_s{\geq}7.0$) earthquakes during the $20^{th}$ century alone. Older masonry mosques with arches and domes and their masonry minarets (slender towers) were among the most affected structures in this highly seismic region. While some of the religious and historical structures had virtually no damage, most structures suffered significant damage or collapsed. In the city of Bolu, for example, approximately 600-year-old Imaret, 500-year-old Kadi, 250-year-old Sarachane, and 100-year-old Yildirim Bayezid mosques suffered substantial structural damage after the 1999 earthquakes. Another historical mosque surveyed in Duzce partially collapsed. Most common factors contributing to deterioration of historical structures are also presented. Furthermore, a brief overview of issues associated with analysis and modeling of historical masonry structures is provided.

Nonlinear static and dynamic behavior of reinforced concrete steel-braced frames

  • Eskandari, Reyhaneh;Vafaei, Davoud;Vafaei, Javid;Shemshadian, Mohammad Ebrahim
    • Earthquakes and Structures
    • /
    • v.12 no.2
    • /
    • pp.191-200
    • /
    • 2017
  • In this paper, the seismic performance of reinforced concrete braced frames (RC-BF) under far- and near-fault motions was investigated. Four-, eight-, 12- and 16-story RC-BFs were designed on the basis of a code-design method for a high risk seismic zone. Nonlinear static and dynamic analyses of the frames have been performed using OpenSees software. To consider diverse characteristics of near-fault motions, records with forward-directivity and fling-step effects were employed. From the results obtained in the analytical study it is concluded that the used design method was reasonable and the mean maximum drift of the frames under all ground motion sets were in acceptable range. For intermediate- and high-rise buildings the near-fault motions imposed higher demands than far-faults.

Assessing Middle-income Residents' Attitudes about Their Urban High-rise Condominium in Contemporary American Society

  • Kim, Wonpil
    • Architectural research
    • /
    • v.2 no.1
    • /
    • pp.27-34
    • /
    • 2000
  • Most research on high-rise housing has focused on low-income residences, and usually the psychological and social well-being of women and children. The validity of such findings are questionable for other populations since high-rise living has served other groups and their various needs in particular settings. Lack of knowledge and understanding about high-rises has represented an obstacle to the accurate representation of American urban reality in residential environments. The review of literature and factor analysis identified Important environmental factors. The survey was conducted in the selected downtown high-rise communities of major U.S. cities. Analyses revealed that there were unique characteristics of residents who prefer to live in this type of housing. It was also found that living in middle-income urban high-rise condominiums does not contribute significantly to the problems associated with high-rise living itself. Even though there were some deficiencies of social interaction and activities among residents, the middle-income condominiums were serving particular residents as maintenance-free and safe place imprinted by a positive image of sweet memories or sometimes by a window view presiding over downtown skyline.

  • PDF

A Model of Risk Management Plan in the Development Phase of Urban Regeneration Project

  • Kim, Seon-Gyoo
    • Architectural research
    • /
    • v.11 no.2
    • /
    • pp.35-42
    • /
    • 2009
  • Recently, intensive urban redevelopment concentrated on new towns has reduced the number of settled population, and weakened various functions such as commercial, culture, education and welfare in old towns, and made the stagnation and declination of the entire or some parts of old towns. Urban regeneration project means renewing cities' functions in terms of physical, environmental, social, cultural, industrial and economic aspects or revitalizing the existing functions through improvement project in the entire or part of a city, which is now drawing keen attention from the public. However, urban regeneration project is huge in scale, needs long construction period and various complex facilities, and also characterized by complicated relations with many stakeholders. Due to such characteristics, there are many risks in the project. Therefore, systematic risk management is absolutely necessary to efficiently manage various risk factors inherent in urban regeneration project. The purpose of this research proposes a basic model to establish risk management plan and work process in order to help project participants to perform risk management more systematically and rationally in the development phase of urban regeneration project.

A Study on the Categorization System and Performance Parameters for the development of the Tube Transportation System's Requirements (튜브운송시스템 요구사항 개발을 위한 분류체계 및 성능변수 추출에 관한 연구)

  • Choi, Yo Chul;Kwon, Huck Bin
    • Journal of the Korean Society of Systems Engineering
    • /
    • v.5 no.2
    • /
    • pp.17-26
    • /
    • 2009
  • This paper is about that case study of the Tube Transportation System that the new transportation system offering passenger and logistic service in a metropolis having plenty of the floating population or between medium-sized cities, and solving large issues like terrible traffic jams and environmental problems etc. in this region. Also it presented that elicitation results of performance parameter and the categorization system of it applying a systematic analysis methodology. By the medium of this paper, It showed that definition, case study, performance parameters, and the categorization system of parameters of a general tube transportation system before developing requirements of a specific tube transportation system. From now on, it will come in pretty handy in systems engineering of activities to establish a concept of a new tube transportation systems and develop requirements.

  • PDF

An Estimation on Demand of Telephone Service in Major Cities of Korea (우리나라 지역별 전화서비스 수요의 추정 - 주택용 전화서비스 수요를 중심으로 -)

  • 최동수
    • Journal of Korea Technology Innovation Society
    • /
    • v.1 no.3
    • /
    • pp.374-385
    • /
    • 1998
  • This study is estimates telephone service demand based on empirical studies of telecommunication service demand model. First, the telephone charge(call price index) by each location and subscription fee bring about a negative effect to telephone distribution rate: while the other explanatory variables bring about a positive effect. Second, the flexibility of telephone charge in A location(relevant location) and the flexibility between the distance of A location and B location are negative values, while the flexibility of other explanatory variables is represented in a positive value. This means that the long distance call numbers from A location to B location are in inverse proportion against the phone charge(call price index) of A location and against the distance between A location and the distance of other locations except A location, while they are in direct proportion with an average call number per minute from A location to other locations except A location, and also with subscription numbers of A location, other subscribers in locations other than A location, and the total expenditures of A location.

  • PDF

Air Pollution by Automobiles and Ways of Reduction (자동차가 대기오염에 미치는 영향과 저감방안)

  • 김대식
    • Journal of the Korean Professional Engineers Association
    • /
    • v.34 no.4
    • /
    • pp.69-73
    • /
    • 2001
  • Due to the rapid increase of automobiles and daily driving distances, air pollution by automobiles is still dominant problem of large city in spite of strict emission refutation and development of reduction technologies. Among the air pollution resources of automobile , industry. electricity generation and heating. automobile keeps 51% of total nationwide air pollution in 1998 and this proportion Is increasing in large cities from 65% to 85%. To reduce these air pollution. catalytic converter and electronic engine control, exhaust gas re-circulation and evaporative emission control system have continuously developed and applied to automobiles since 1987. Also strong emission standards and emission durability warranty have enforced and monitored annually by sampling several vehicle models. But technologies and regulations are incomplete, driver should participate in reducing air pollution for himself by planning driving, avoiding unnecessary idle and air conditioning, keeping periodic maintenance and using mass transportation.

  • PDF

A Study on general logistic center of agriculture products for location selection model (농산물 종합물류센터조성을 위한 입지선정 평가요인 분석)

  • 김규창
    • Journal of Distribution Research
    • /
    • v.3 no.1
    • /
    • pp.145-158
    • /
    • 1998
  • The selection of proposed sites for the general logistic center of agriculture products would be made the most suitable place by considering the spread of population as real consumers, the prospect of the demand, the expansion of traffic system, the regional, hourly and carring traffic volume and the use of land based urban planning, etc. As the preconsideration, the possible occupant companies have to be selected on the category of business and the district. After posing questions and having interview, several selected regions would be compared and analysed for deciding the most suitable place. The model for the general logistic center of agricultural products must be selected taking key factors approach for choosing key factors at first and referring to many documentary records. And the more, cooperating with the specialists for location selection and making objective questions to concerned companies, the most suitable place is selected by marking high score for the moderate land cost, the low traffic jam, the connection with the back cities and the possible expansion as the general logistic center of agriculture products.

  • PDF

Modelling and Analysis for Sharing of Full Electric Vehicles in Small-sized Cities (소규모 도시를 위한 전전기 자동차 세어링 서비스 시스템 모델링 및 분석 연구)

  • Jin, Young-Goun;Cho, Hyun-Seob
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.13 no.4
    • /
    • pp.1857-1862
    • /
    • 2012
  • It is very difficult to construct and manager public transit, like subway, in small city. In this paper, we suggest full electric vehicle sharing service framework as a public transit system in small city. The suggested system will reduce environment pollution and increase resource usage efficiency. The simulation result shows that the suggested electric vehicle sharing system can reduce traffic congestion and lower city road stress.