• 제목/요약/키워드: urban school

검색결과 3,614건 처리시간 0.034초

Determination of Urban Surface Aerodynamic Characteristics Using Marquardt Method

  • Zhang, Ning;Jiang, Weimei;Gao, Zhiqiu;Hu, Fei;Peng, Zhen
    • Wind and Structures
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    • 제12권3호
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    • pp.281-283
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    • 2009
  • Marquardt method is used to estimate the aerodynamic parameters in urban area of Beijing City, China, including displacement length (d), roughness length ($z_0$) and friction velocity (u*) and drag coefficient. The surface drag coefficient defined as the ratio between friction velocity and mean wind speed is 0.125 in our research, which is close to typical urban area value. The averaged d and $z_0$ are 1.2 m and 7.6 m. d and $z_0$ change with direction because of the surface heterogeneity over urban surface and reach their maximum values at S-SW sector, this tendency agrees with the surface rough element distribution around the observation tower.

도시철도 시스템 전기요금 절감을 위한 혼합정수계획법 기반 ESS(에너지저장장치) 스케줄링 기법 (Mixed Integer Programming (MIP)-based Energy Storage System Scheduling Method for Reducing the Electricity Purchasing Cost in an Urban Railroad System)

  • 고락경;공성배;주성관
    • 전기학회논문지
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    • 제64권7호
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    • pp.1125-1129
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    • 2015
  • Increasing peak load is one of the major concerns about operation of urban railroad systems. Since ESSs (Energy Storage Systems) have a great potential for shaving the peak load, there has been a growing interest in the use of ESS for peak load reduction. Also, ESS can be optimally scheduled to minimize the electricity purchasing cost under a given ToU (Time-of-Use) tariff by taking advantage of electricity price difference between peak and off-peak time. This paper presents a Mixed Integer Programming (MIP)-based ESS scheduling method to minimize the electricity purchasing cost under a ToU tariff for an urban railroad system.

Phytoremediation of Urban Air Pollution

  • Fang, Qin;Wang, Yun;Jin, Jie
    • 도시과학
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    • 제8권2호
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    • pp.35-39
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    • 2019
  • With the rapid progress of society and economic growth, more and more factories are put into construction, although to a certain extent to promote the development of our country's economy, but the waste gas and waste water produce also harm the environment.Among them, air pollution causes great damage to the environment and harms human health.In order to protect people's safety and health, people began to look for some measures to control air pollution, one of the most effective way is to plant more green plants, using plants for air purification.

도시공간구조 유형별 초등학교 통학로 실태 및 안전도 영향규명 연구 (An Investigation on Actual Condition and the Influence of Safety on Elementary School Road by Types of Urban Spatial Structure)

  • 김태호;김승현;이수일
    • 한국안전학회지
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    • 제28권5호
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    • pp.71-77
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    • 2013
  • This Study aims at investigating actual condition on attending school road of children and analyzing empirically the characteristics of cognition and the influence of safety on school road. This study findings are as follows : 1) Walking alone to go to school is the highest rates among Commuting Mode, and Commuting distance to school is nearly doubles than range of school zone(300 m). 2) Among characteristics of urban spatial structure affecting on influence classify safety of school road, 'Commuting Distance' has been drawn to most influential variable. Especially, there are 4 types classified by commuting distance and it became obvious that the longer the distance, the lower the safety score(under 127 m=76.9 points, Over 451 m=58.3 points). 3) As a result of investigating the influence of Safety on attending school road, Vehicle commuting speed urder 127 m as internal of school zone, and Walking and crossing convenience over 451 m as external of school zone have a lot of influence on safety cognition on school road. Therefore Safety on school road should be considering the commuting distance to school among surrounding characteristics, needed for improvement plan and program based on real safety cognition of children.

도시.농촌 지역 초등학생의 가족환경, 건강행위 및 건강상태에 관한 비교 (Comparision of Family Environment, Health Behavior and Health State of Elementary Students in Urban and Rural Areas)

  • 배연숙;박경민
    • 지역사회간호학회지
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    • 제9권2호
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    • pp.502-517
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    • 1998
  • This research intends to survey family environment, health behavior and health status of the students in urban-rural elementary schools and analyze those factors comparatively, and use the result as basic material for school health teacher to teach health education in connection with family and regional areas. It also intends to improve a pupil's self-abilitiy in health care. The subjects involve 2,774 students of urban elementary schools and 583 student in rural ones, who were selected by means of a multi -stage probability sampling. Using the questionnaire and school documents, we collected data on family environment, health behavior and health status for 19 days. Feb. 2nd 1998 through Feb. 20th 1998. The R -form of Family Environment Scale (Moos, 1974) was used in the analysis of family environment(Cronbach's Alpha =0.80). Questionnaires of Health Behavior in School-aged children used by the WHO in Europe(Aaro et al., 1986) and the ones developed by the Health Promotion Committee of the Western Pacific(WHO, 1995)(adapted by long Young-suk and Moon Young-hee(1996)) were used in the analysis of health behavior, as well documents on absences due to sickness, school health room-visits, levels of physical strength, height, weight and degree of obesity were used to determine health status. In next step, We used them with an $X^2$-test, t-test, Odds Ratio, and a 95% Confidence Interval. 1. In two dimensions of three, family-relationship (t=3.41, p=0.001) and system -maintenances(t= 2.41, p=0.0l6) the mean score of urban children were significantly higher than those of rural ones. In the personal development dimension however, there was little significant difference. Assorting family environment into 10 sub-fields and analyzing them, we recognized that urban children were superior to rural children in the sub-fields of expressiveness (t =3.47, p=0.001), conflict (t=0.48, p=0.001), active-recreational orientation (t = 1.97, p=0.049) and organization (t=4.33, p=0.000). 2. Referring to the Odds Ratios of urban-rural children's health behaviors, urban children set up more desirable behavior than rural children wear ing safety belts (Odds Ratio =0.32, p=0.000), washing hands after meals(Odds Ratio = 0.43, p= 0.000), washing hands after excreting (Odds Ratio = 0.39, p=O.OOO), washing hands after coming - home ( Odds Ratio = 0.75, p = 0.003), brushing teeth before sleeping(Odds Ratio =0.45, p=0.000), brushing teeth more than once a day (Odds Ratio =0.73, p=0.0l2), drinking boiled water (Odds Ratio = 0.49, p=0.000), collecting garbage at home(Odds Ratio=0.31, p=0.000) and in the school(Odds Ratio =0. 67, p=0.000). All these led to significant differences. As to taking milk(Odds Ratio = 1.50, p=0.000), taking care of eyesight(Odds Ratio=1.41, p=0.001) and getting physical exercise in(Odds Ratio = 1.33, p=0.0l9) and outside the school(Odds Ratio = 1.32, p=0.005), rural children had more desirable behavior which also revealed a significant difference. There was little significant difference in smoking, but the smoking rate of rural children(5.5%) was larger than that of urban children(3.9%). 3. Health status was analyzed in terms of absences, school health room-visits, levels of physical strength, and the degree of obesity, height and weight. Considering Odds Ratios of the health status of urban-rural children, the health status of rural children was significantly better than that of the urban ones in the level of physical strength(t=1.51, p=0.000) and the degree of obesity(t=1.84, p=0.000). The mean height of urban children ($150.4{\pm}7.5cm$) is taller than that of their counterparts($149.5{\pm}7.9$), which revealed a significant difference (t =2.47, p=0.0l4). The mean weight of urban children($42.9{\pm}8.6kg$) is larger than that of their counterparts($41.8{\pm}9.0kg$), which was also a significant difference(t=2.81, p=0.005). Considering the results above, we can recognize that there are significant differences in family environment, health behavior, and health status in urban-rural children. These results also suggestion ideas for health education. What we would suggest for the health program of elementary schools is that school health teachers should play an active role in promoting the need and importance of health education, develop the appropriate programs which correspond to the regional characteristics, and incorporate them into schools to improve children's ability to manage their own health management.

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A Simulation Study of Urban Public Transport Transfer Station Based on Anylogic

  • Liu, Weiwei;Wang, Fu;Zhang, Chennan;Zhang, Jingyu;Wang, Lei
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제15권4호
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    • pp.1216-1231
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    • 2021
  • With the increase in the population of our cities and the rapid increase in the number of private cars, urban traffic has become more and more congested. At this stage, urban public transportation has become one of the main ways to improve urban traffic congestion. Aiming at the problem of how to improve the basic capacity of buses in multi-line transfer stations, this paper conducts simulation research based on anylogic software. Through micro-simulation analysis of vehicles entering, stopping, and exiting the station, combined with the delay model theory, the vehicle is given Stop organization optimization and station layout improvement methods, so that vehicles can run in the station more stably, smoothly and safely. Case analysis shows that applying this method to the roadside parking problem, the main and auxiliary bus stations have a significant improvement in operating capacity compared with the conventional tandem double bus stations, and the service level of the main and auxiliary bus stations has been significantly improved.

도시텃밭 운영주체별 운영방식의 차이에 따른 공동체 형성 효과 (The Study on Community Formation Effect from Urban Garden Management by Different Operators)

  • 이차희;손용훈
    • 농촌계획
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    • 제20권1호
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    • pp.63-76
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    • 2014
  • The purpose of this study is to identify effect in how urban garden is run by different operators in Korea, and consequently how it determines the level of community formation among urban garden users. Based on this analysis, the study is intended to present some points as to how to better manage urban garden. The operators are divided into three types: public, public-private partnership and private. The study interviewed each operating entity and surveyed garden users to gauge the extent to which communities are developed. After the ANOVA analysis and Scheffe post-hoc analysis, it was found that the levels of community formation among users of public and public-private partnership urban gardens were similar (so can be grouped together), whereas that of private urban garden users was higher (separated as another group). However, this study found no meaningful differences in the level of community formation among all types of urban garden in a local community. Some key suggestions are made as a result. First, as for the public and public-private partnership types of urban garden, it is necessary to foster leaders to build a community. Next, it is worth noting the potential of public-private partnership in realizing community revival through urban garden. The last suggestion is that, generally, the urban garden has only little influence on community formation in a local area so far, thus more practical consideration needs to be given to enhance the role of urban garden in a local community.

주거지내 초등학교의 활용을 위한 계획 방향 (Planning and Design Guidelines for the Utilization of Elementary Schools in Urban Housing Blocks)

  • 임은정;양우현
    • 한국주거학회논문집
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    • 제15권1호
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    • pp.205-214
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    • 2004
  • The intent of this study is to investigate the current situations and planning implications of elementary schools in urban housing blocks, and to propose the planning and design guidelines for them. The premise of this research is that an elementary school should function as a communal facility, shared by its community, so called open-school. 32 schools in three new towns were selected as sample cases and they were closely surveyed in terms of their site planning issues in residential blocks, and three sample open-elementary schools were analyzed in a comparative manner for finding their roles and functional fulfillment as a communal facility in the neighborhoods. Based on the findings, several planning principles and design techniques or devices are suggested for the utilization of elementary schools by local residents, mainly making issues of location, relationship to other facilities and open spaces in residential blocks, access, apartment layout, school building and outdoor spaces, and open program.

초등학교 주변을 중심으로 본 서울시 도시녹지 현황 분석 및 고찰 - 원격탐사 방법을 이용한 식생분류 - (Study on the Current Status Analysis of Urban Green Spaces in Seoul Focusing on Elementary School Surroundings - Remote Sensing Based Vegetation Classification -)

  • 김현옥
    • 한국조경학회지
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    • 제40권5호
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    • pp.8-18
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    • 2012
  • 도시자연은 물리적 환경개선 기능은 물론 사회적, 정서적 측면에서도 중요한 역할을 한다. 특히, 학교에서 생활하는 시간이 많은 우리나라의 경우 학교 옥외공간을 비롯하여 인근에 조성된 녹지공간은 자연체험의 기회가 적은 도시 아이들이 가장 쉽게 자연을 접할 수 있는 일차적인 장소이다. 본 연구에서는 우리나라 대도시의 녹지현황을 학교 주변을 중심으로 살펴보고자 한다. 서울시 185개 초등학교를 선정하고, 학교 옥외공간을 포함한 반경 300m 이내(본 연구에서 '학교존'으로 정의) 주변 녹지 현황을 RapidEye 다중분광 인공위성 영상을 사용하여 분석하였다. 학교존 평균 녹지율은 약 21%이고, 최고 74%에서 최소 0.7%까지 편차가 매우 큰 것으로 나타났다. 그리고 과반수 이상의 학교존 녹지율이 20% 미만이다. 학교존 녹지율이 높은 학교 대부분이 산기슭에 위치하고 있어 산림면적이 학교존 녹지율을 높이는데 기여한 것으로 분석되며, 산림녹지의 경우 식생활력 또한 기타 도심지에 조성된 조경수목식재지보다 상대적으로 높은 것으로 나타났다. 반면, 학교존 녹지율이 낮은 학교들 대부분은 고밀 주택지 인근에 위치하고 있으며, 녹지의 식생활력 또한 상대적으로 낮게 나타났다. 도시산림을 제외한 시가화지역에서 학교존 녹지의 많은 부분을 차지하는 것은 아파트단지내 조경녹지시설이며, 그 밖에 친환경적인 학교 옥외공간이나 가로공원 등 도시오픈스페이스가 차지하는 비중은 미미하다. 이러한 현실을 감안하여, 도시계획적인 맥락에서 학교존 녹지율이 낮은 지역을 우선 대상으로 학교숲 조성사업을 지원하거나 주변지역의 옥상녹화를 장려하고, 학교주변 아파트단지내 녹지공간을 학교옥외공간과 유기적으로 연계하여 쉽게 접근할 수 있는 도시오픈스페이스로 개방하는 등의 체계적인 대책 마련이 필요하다고 하겠다.

초, 중, 고등학생들의 비만에 영향을 미치는 도시 특성 (Urban Characteristics Affecting Obesity of Elementary, Middle and High School Students)

  • 이영성;정해영;유현지;김경민
    • 지역연구
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    • 제31권3호
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    • pp.113-130
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    • 2015
  • 성인을 중심으로 건강도시를 논의한 기존 연구와 달리, 본 연구는 청소년 비만에 영향을 미치는 도시 특성을 규명하고자 했다. 도시특성이 청소년 비만에 영향을 미치는 기제(mechanism)에 대한 엄격한 의학적 이론이 드물기 때문에 본 연구는 선행연구 검토를 통해 청소년 비만에 영향을 미칠 것으로 판단되는 도시특성을 도출하고, 이를 토대로 회귀분석을 했다. 교육부의 학생 신체검사 자료를 이용하여 서울 시내 각 학교별 비만학생 비율을 종속변수로 설정했다. 선행연구를 통해 파악한 도시특성을 각 학교를 중심으로 하는 일정 반경(500m, 1000m, 1500m) 내에서 버퍼분석(buffer analysis)으로 측정한 뒤, 독립변수로 설정했다. 회귀분석한 결과, 성인교육수준이 낮을수록, 단독 연립 다세대 다가구 주택이 많을수록, 노후 주택이 많을수록, 토지이용혼합도가 낮을수록 비만청소년이 많았다. 인구밀도, 대중교통 접근성, 도시공원 등은 유의하지 않았다. 이러한 결과를 토대로 청소년 비만율을 낮추거나 관리하기 위한 도시계획 방안이 앞으로 더욱 논의되어야 할 것으로 보인다.