• 대한공간정보학회지
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• 제24권4호
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• pp.97-104
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• 2016

본 연구에서는 강원도에 존재하는 노천 채굴 방식의 석회석 광산 내부에 존재하는 생태복원지역에 대한 변화 분석 및 모니터링을 수행하고자 고해상도의 다시기 정사영상을 이용하여 식생 분포 지역의 식생 분포 변화 분석을 수행하고자 하였으며, DEM을 이용한 지형의 변화 분석을 수행하였고, 드론 사진측량의 활용성을 검토하고자 하였다. 따라서 본 연구에서는 2014년 항공레이저측량 및 2015년 고정익 드론사진측량으로 제작된 정사영상과 포인트 클라우드를 수집하였다. 또한 2016년 회전익 드론사진측량을 이용하여 정사영상 및 포인트 클라우드를 제작하고, 이를 이용하여 생태복원지역의 변화 분석을 수행하였다. 그 결과 유인 항공측량시스템보다 단시간, 저비용으로 지형공간정보를 생성하고 이를 이용하여 노천광산 생태복원지역의 변화 모니터링 수행이 가능하였다. RGB 정사영상을 활용하여 식생 분포 지역을 추출하는 nEGI 및 VARI를 통해 식생 분포 지역을 추출한 결과 식생 분포 지역이 대상지역의 면적 대비 약 10~30%가 증가하여 생태복원이 원활하게 진행되고 있는 것으로 나타났다. DEM을 이용해 제작된 단면과 복원 계획선을 비교 분석한 결과 드론의 활용으로 제작된 단면과 복원 계획선이 ${\pm}10cm$의 오차로 유사한 형태를 나타냈으며, 토공량 분석이 가능하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2439-2449
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• 2011

Existing grade crossings between railway and roadway area gradually changed to grade separation systems by the law. In the case of new roadway construction which crosses railways, it shall be grade separation system in principle. With the railway underground crossing method, many practices have been developed which can minimize rail displacements and avoid rail release. With these methods, the effects to the train can be reduced. The underground crossing methods can be identified as open-cut methods and non open-cut methods. The open-cut methods include temporary support methods and special rail construction methods. Also the non open-cut methods includes pipe roof methods, front jacking methods, messer shield methods, NTR methods and JES methods. Among these, the most suitable method is applied considering safety, economy, class of each rail system (train passing frequency and velocity), etc. In the non open-cut methods, the cost and duration shall be increased to keep existing rail system during construction. In the open-cut methods which use plate girders, the rail speed shall be restricted due to the displacement and vibration of the girder. In this study new grade separation methods were developed. With this method, the safety during construction can be increased. This method refines temporary support methods, but pc slab girder with huge stiffness is applied instead of plate girders. With this method, the rail displacement can be reduced and higher safety can be obtained during construction. Also construction cost and duration can be minimized because the temporary work and the overburden soil depth can be reduced.

• 한국멀티미디어학회논문지
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• 제17권8호
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• pp.988-994
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• 2014

Software Defined Network (SDN) is a new technology in computer network area which enables user to centralize control plane. The security issue is important in computer network to protect system from attackers. SYN flooding attack is one of Distributed Denial of Service attack methods which are popular to degrade availability of targeted service on Internet. There are many methods to protect system from attackers, i.e. firewall and IDS. Even though firewall is designed to protect network system, but it cannot mitigate DDoS attack well because it is not designed to do so. To improve performance of DDOS mitigation we utilize another mechanism by using SDN technology such as OpenFlow and sFlow. The methodology of sFlow to detect attacker is by capturing and sum cumulative traffic from each agent to send to sFlow collector to analyze. When sFlow collector detect some traffics as attacker, OpenFlow controller will modify the rule in OpenFlow table to mitigate attacks by blocking attack traffic. Hence, by combining sum cumulative traffic use sFlow and blocking traffic use OpenFlow we can detect and mitigate SYN flooding attack quickly and cheaply.

• 산업기술연구
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• 제25권B호
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• pp.19-25
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• 2005

To use land more efficiently under urbanization trend, Kangwon Province often covers open channels of creeks and uses them as parking lots or roads. A covered open channel section tends to form a rectangular culvert. Therefore, a creek with covered open channels can function as a storm drain. At the time of light rainfall, there are no significant differences except water flowing pattern between a creek with a covered open channel and a creek without it. Recently, however, the frequent occurrence of heavy rainfalls limited at a small, definite area has become problematic. When the heavy rainfall causes the carrying capacity of a creek to be exceeded,the creek with covered open channel has a more serious problem than the creek without it has. Therefore, we made an interpretation of data and conducted hydraulic model experiment to come up with economical solution to this problem.

• 한국공간구조학회논문집
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• 제20권2호
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• pp.69-76
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• 2020

Wind tunnel tests were conducted to analyze the wind fluctuating pressures on a circular closed and open dome roof with a low span rise. Two dome models with various geometric parameters (height/span ratios and open ratios) were used for fixed span rise ratio dome and wind pressure spectrum were analyzed. The applicability was examined in comparison with the spectral model proposed in the previous studies. The analysis results show that the wind pressure spectrum of open dome roof tends to increase power in the high frequency range and the second peak is found in the area different from the closed dome roof. In addition, according to the comparison analysis with the previous proposed spectral model, it was found that it is not applicable to the closed and open dome roofs with low rise ratio due to the different peak frequencies.

• 한국비블리아학회지
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• 제29권2호
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• pp.35-56
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• 2018

본 연구는 공공데이터 포털을 통해 개방된 도서관 관련 데이터의 현황을 다각도로 살펴보며, 공개된 데이터의 수준과 공개 주체에 따라 데이터의 활용 정도에 어떠한 차이가 나타나는지 분석하였다. 또한 데이터의 공개주체를 지방자치단체와 국가 및 공공기관으로 구분하여 데이터에 부여된 키워드를 활용해 PathFinder Network 분석을 수행함으로써 양 주체가 공개한 데이터의 주제 군집과 중심성에 어떠한 차이를 보이는지 분석하였다. 그 결과 국가 및 공공기관이 공개한 데이터로부터는 연구자료 등을 중심으로 4개의 주제군집이, 지방자치단체가 공개한 데이터로부터는 소장자료, 평생교육프로그램 등을 중심으로 8개의 주제 군집이 형성되었으며, 국가 및 공공기관이 공개한 데이터가 학교 및 공공도서관의 단순 현황을 주로 공개하고 있는 지방자치단체 공개 데이터보다 높은 활용도를 나타냈다.

• 대한건축학회논문집:계획계
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• 제34권3호
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• pp.35-44
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• 2018

The purpose of this study is to elucidate the formation process and spatial characteristics of the first and largest open port of Foreign Settlement in Yokohama, Japan. Based on the reference records and maps, we traced the process of modernization, example of opening the park and introduction of technology, industrial & infra-structural facilities. And found out the characteristics of formation process of port city Yokohama as the modernized city. The results of this study are as follows: First, the spatial characteristics and significance of the public space of the port open space; second, the difference of the road and parcel systems between the Japanese and the foreign settlements; and third, the meaning of the port open space as the space of separation in that times. These experiences about the open port in Yokohama could be worked as the basic for domestic and colonial city planning.

• 대한원격탐사학회지
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• 제6권2호
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• pp.89-113
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• 1990

The purpose of this study is to develop means to apply GIS and remote sensing technology to the analysis of Korean urban open spaces. To achieve this objective, a framework of analysis of urban open spaces was developed, and then the framework was applied for the evaluation of the potential and suitability of open spaces of Ansan City, which is a new town developed to accomodate industries relocation from Seoul, Korea, mainly due to their pollution problems. The software used in this study are IDRISI, a grid-based GIS, and KMIPS, a remote sensing analysis system. Both packages are based on IBM PC/AT computers with Microsoft DOS. Landsat MSS and TM data were used for the land use classification, land use change detection, and analysis of transformed vegetation indices. The size of the geographic data base is 110 rows and 150 columns with the spatial resolution of 100m$\times$100m. The framework of analysis includes both quanititative and qualitative analysis of open spaces. The quantitative analysis includes size and distribution of open spaces, urban develpment of open spaces, and the degree of vegree of vegetation removal of the study area. The qualitative analysis includes evaluative criteria for primary productivity of land, park use potential, major visual resources, and urban environmental control. The findings of this study can be summarized as follows. First, the size of builtup areas increased 18.73km$^2$, while the size of forest land decreased 10.86km$^2$ during last ten years. Agricultural lands maintained its size, but shifted toward outside of the city into forest. Second, the potential of open spaces for park use is limited mainly due to their lack of accessibility and connectivity among open spaces, in spite of ample acreage and good site conditions. Third, major landscape elements and historic sites should be connected to the open space system of the city by new accesses and buffers.

• 한국정밀공학회지
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• 제29권8호
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• pp.920-926
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• 2012

Wrinkling is a common phenomenon in nature and the shape of a wrinkle can be defined using characteristic dimensions such as pitch, length, amplitude, and density etc. Wrinkle structure can be utilized in various research fields, and especially it has special characteristics when it used in applications of heat transfer; a wrinkly surface has the effect to promote turbulent flow and increasing surface area. However, the generation of wrinkle structures in somewhat regular is not easy. Till now, there are some research works focused on realization of wrinkles in micro scale. However, most of the processes generally requires high precision equipments and high costs, and also there is a limitation to generate the wrinkles in a large area. In this study, we propose a novel method named as a RCO (repetitive contact-and-open) process to fabricate wrinkle structure with low cost and relative easy way. Using the RCO, we fabricated micro-corrugate structures successfully. From the experimental results, we found out the process parameters of RCO, and showed the possibility of RCO to be used in real applications.

• 한국농촌건축학회논문집
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• 제20권3호
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• pp.37-45
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• 2018

There are many advantages to unit-care welfare facilities' care services for the elderly in Japan. The field research was conducted after holding interviews with employees at five elderly welfare facilities in Japan. This research analyzes the space arrangement of unit-care welfare facilities in Japan's Tohoku rural area. The purpose of this study is to provide design data on the space arrangement of a unit-care facility for Korea. The results of research are as follows. 1. Cafes, restaurants, and stores were operated in the elderly welfare facilities, which were open to the general public as well. Therefore, local residents frequently visited. 2. The kitchen, living rooms, private bedrooms and construction of the elderly welfare facilities were similar to that of normal residential houses. 3. The event hall is conveniently located at the center of the facility. 4. It was easy to understand the health status of the elderly by having a health office in the open living room. 5. There were open spaces which are frequently used by the homebound elderly, including room rehabilitation, daycare and short term residence. The above results will be used for space planning data in Korean unit-care facilities.