• 한국주거학회논문집
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• 제19권3호
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• pp.11-20
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• 2008

The purpose of this study was to find out tendencies in the planning characteristics focused on the community, single building, shared spaces and interior concept of apartment houses in Daejeon City, and to analyze these characteristics according to apartment unit floor plan based upon the arrangement of room, the type of main entrance, the type of LDK, anbang, kitchen, bathroom and the 3rd space. This study used the content analysis method and analysis was made on drawings and descriptions showing planning characteristics of apartment houses. Above all, 34 cases of apartment houses and 159 unit plans were analyzed. The results of this study were as follows: 1) The most important characteristics of the direction of housing development was the "well-being" concept including greenzone and natural environment. The most mentioned community spaces were children's playgrounds and parks. The emphasized interior concepts were noble, well-being and natural concepts. 2) The most prominent front arrangement type was the 3-bay unit plan, front space arrangement was focused on rooms and, livingroom. The most prominent front space arrangement types were R/L/R, R/L/R/R and there is a new tendency towards KD/L/R/R. 3) The most prominent LDK floor plans were of the LDK type. The type of "Anbang" arrangement consisted mainly of room-bathroom-dressing room. The type of public bathroom arrangement consisted mainly of bathtub-toilet-washbasin and the "Anbang" bathroom arrangement was shower-booth-toilet-washbasin.

• 한국통신학회논문지
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• 제29권2B호
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• pp.151-157
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• 2004

본 논문은 밀리미터파 대역용 무선통신송수신기를 이용하여 도시환경에 적합한 초고속무선통신 셀백본망을 구축하는 것에 관한 것이다. 밀리미터파 대역중 산소분자의 신호흡수 특성이 큰 60㎓ 대역용 무선통신송수신기를 제작하였으며, 이를 이용한 통신시스템간의 간섭신호가 제거되고 망구성의 형태에 따른 다양한 무선링크의 유효거리를 확보할 수 있음을 확인하였다. 또한 무선백본노드를 중심으로 유효반경 약 500m에서 3km이내의 셀간격으로 각각의 서비스망을 구축하여 도시전체를 셀망의 무선백본망을 구성하고, 155.52MbpsATM(OC-3)급의 도시형 무선 통신 셀백본망이 가능토록 하였다.

• Journal of Forest and Environmental Science
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• 제31권4호
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• pp.288-296
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• 2015

In many very high density cities in Asia in which there is limited area to expand, growth is forced upward as well as outward. Densely packed detached houses and low-rise buildings are replaced by lower density high-rises, leaving open spaces between high-rise buildings. Through this process, areas that formerly did not have much green space gain valuable green spaces, and new ecological corridors and patches are created. In this study, the demographic and housing-type changes of Wonju City were delineated using land use maps, aerial images, census data, and other administrative data. Green area changes were calculated using land cover data derived from multi-year Landsat TM satellite imagery. The values were then compared against demographic and housing-type changes for each administrative unit. The overall results showed a decrease of forested area in the city and an increase of developed area. Urban sprawl was clearly visible in many of the suburban areas. However, as expected, we also detected areas in which greenness did not decrease when the population greatly increased. These areas were characterized by residential building complexes of ten or more stories. If an equal number of housing units had been built as detached houses, these areas would not have kept as much green space. Our research result showed that high-density and high-rise residential structures can offer an alternative means to protect or create urban green spaces in high-density urban environments.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 춘계학술대회 논문집
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• pp.6-7
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• 2008

The purpose of this study was to investigate heat resistance for union type SMD inductor core. The samples was produced with process 5 step. In this study, it analysis heat resistance of SMD(Surface Mounted Device) inductor core and it get electric field only exist inside of SMD core. Therefore electric fields do not affect any device and equipments. These results are very important to design data acquisition system(several test equipments such as temperature, impedance, and current test), because data acquisition system can place under the SMD Inductor core. So, it can be decrease their test error due to electric field.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(III)
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• pp.493-499
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• 2003

Railroad, a superior mode of public transportation provides safe, efficient, speedy, comfortable and economical service, has fundamentally different characteristics from airplanes, ships and cars. Among the unique characteristics of a railroad is the fact that it operates on fixed track with multiple car trains. The subway system was first selected as the best solution to difficult automobile traffic conditions and environmental problems. Seoul subway no.1line (Jongno line) was opened for service on August 15, 1974. Seoul city has completed and now operates eight subway lines (286.7km) since 1974. At present the subways operate in Busan, Daegu and Incheon city, and are under construction in Gwangju and Daejeon city. The power source for subway trains has been electricity since 1896, and power supply systems are the third rail type and/or the catenary system. The typical catenary system is the rigid bar type. R-bar and T-bar are used in the rigid bar type of catenary system, and the two types of R-bar and T-bar are uesd in Korea also. R-bar is used only for AC 25kV power supply and T-bar for DC 1,500V. From 30 years of subway experience I would like to suggest the most economic catenary system to ensure of safety, reliability and expediency for the railway lines to be constructed and the forthcoming replacement due to the life cycle after studying and analysing the characteristics, advantages and disadvantages of R-bar and T-bar.

• Smart Structures and Systems
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• 제30권6호
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• pp.583-599
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• 2022

In this paper, a multi-objective wireless sensor network configuration optimization method is proposed. The proposed method aims to determine the optimal information and lifespan wireless sensor network for structural health monitoring of large-scale infrastructures. In particular, cluster-based wireless sensor networks with multi-type of sensors are considered. To optimize the lifetime of the wireless sensor network, a cluster-based network optimization algorithm that optimizes the arrangement of cluster heads and base station is developed. On the other hand, based on the Bayesian inference, the uncertainty of the estimated parameters can be quantified. The coefficient of variance of the estimated parameters can be obtained, which is utilized as a holistic measure to evaluate the estimation accuracy of sensor configurations with multi-type of sensors. The proposed method provides the optimal wireless sensor network configuration that satisfies the required estimation accuracy with the longest lifetime. The proposed method is illustrated by designing the optimal wireless sensor network configuration of a cable-stayed bridge and a space truss.

• 지역연구
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• 제34권3호
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• pp.55-68
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• 2018

본 연구는 대구혁신도시 사례를 중심으로 신시가지형 혁신도시개발에 따른 대도시 인구분포 변화를 분석하는데 목적을 두었다. 이를 위해 2007~2016년 통계청 인구동향조사와 국내인구이동통계 마이크로데이터를 활용하여 대구광역시 및 주변 시군의 인구변화를 자연적 증가와 사회적 증가(인구이동)로 분해하여 동태적으로 분석하였다. 분석 결과, 대구광역시의 인구는 지속적인 감소경향을 보이는 반면, 도시외곽 혁신도시개발지가 위치한 동구는 해당지역으로의 인구유입에 따라 인구성장을 경험하고 있었다. 특히 2014년 이후 동구로의 높은 순 인구이동의 발생은 대구혁신도시 개발의 준공과 공공기관 이전 시기와 일치하는 패턴을 보여주었다. 2007~2016년 사이 동구로 이동 인구의 전출지역을 분석한 결과 수도권으로부터 유입은 전체의 6.9%인 반면 동구 내부이동(34.5%)과 더불어 대구 내 7개 구군(35.8%)과 주변 4개 시군(8.2%)에서 유입된 인구가 큰 비중을 차지하였다. 특히 대구혁신도시가 위치한 동구로의 전입인구는 동구 인접지역인 수성구, 북구, 경산시로부터 유입인구가 많은 것으로 나타나 시가지형 혁신도시개발은 도시의 외연적 확산을 심화시키고 있음을 확인하였다.

• 한국환경과학회지
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• 제23권9호
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• pp.1619-1626
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• 2014

We analyzed diurnal variations in the surface air temperature using the high density urban climate observation network in Daegu metropolitan city, the representative basin-type city in Korea, in summer, 2013. We used a total of 28 air temperature observation points data(16 thermometers and 12 AWSs). From the distribution of monthly average air temperature, air temperature at the center of Daegu was higher than the suburbs. Also, the days of daily minimum air temperature more than or equal to $25^{\circ}C$ and daily maximum air temperature more than or equal to $35^{\circ}C$ at the schools near the center of Daegu was more than those at other schools. This tendency appeared more clearly on the days of daily minimum air temperature more than or equal to $25^{\circ}C$. Also, the air temperature near the center of the city was higher than that of the suburbs in the early morning. Thus it was indicated that the air temperature was hard to decrease as the bottom of the basin. From these results, the influence of urbanization to the formation of the daily minimum temperature in Daegu was indicated.

• 한국도로학회논문집
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• 제14권4호
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• pp.133-140
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• 2012

PURPOSES : Traffic situation of Seoul City is different each administrative district. because each administrative district population, average travel speed, etc are different. thus, regionally differentiated policy is necessary. METHODS : In this study, first, it is to implement the cluster analysis using the traffic factor of twenty-five administrative districts in Seoul, categorize it into the cluster and understand the properties. second, related factors of speed were derived. and method to increase the speed was investigated. we choose the eleven traffic factors such as the number of traffic accident cases, total length, speed, the number of cross section, the number of cross section per km, the rate of roads, registered cars, population attending office and school, population density, area. RESULTS : In the results, first, we could categorize the Seoul-City administrative district into three clusters. in order to find Factors associated with speed a simple regression analysis was performed. and the number of intersections per km is closely related to the speed. CONCLUSIONS : Through this study, transportation policies reflecting local traffic-related characteristics are required.

• 산업경영시스템학회지
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• 제35권3호
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• pp.192-203
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• 2012

As a leading nation of ubiquitous technology, South Korea has been promoting u-City pilot projects throughout the country. According to 'Fundamental Construction Law of u-City,' u-City projects are classified into old-town and new-town types. However, most projects have focused only on the new-town type. Pushing forward large-scale land development projects, Korea Land and Housing Corporation (LH Co.) under Ministry of Land Transport and Maritime Affairs (MLTM) has gained a development profit out of the u-City infrastructure and then donated the infrastructure to a local government without making any plan for operations. In the process of u-City pilot projects, old-towns have been relatively ignored and various of unexpected problems have emerged. Building the u-City of an old-town is not easy due to many constraints such as huge initial investment, long validity and verification procedures, lack of useful services for citizens, lack of professional outsourcing methods for business promotion, high operating costs of the integrated control center, inadequate law related, insufficient institutional requirements and so on. This paper introduces a case study on u-City development for an old-town, Ansan City, as a private investment project. The case will help boost u-City projects for old-towns by solving their problems and providing an effective operational mechanism. As the first BTL (Build-Transfer-Lease) project for constructing u-City, 'Broadband Information Network Development Project' of Ansan City will provide a reference model of expanding u-City projects for other cities.