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

• 한국건설관리학회논문집
• /
• 제17권3호
• /
• pp.98-107
• /
• 2016

건설 프로젝트에서 정보관리 시스템은 도면, 문서관리, 행정처리 위주로 사용되고 있으며, 실시간 의사소통 및 참여자간의 의사전달 관리를 지원하는데는 한계가 있다. 본 연구에서는 다양한 커뮤니케이션 방식과 콘텐츠를 지원하는 플랫폼 비즈니스 시대에 맞추어 프로젝트 참여자간 의사전달 관리를 지원하는 협업 플랫폼을 개발함으로써 효과적인 의사소통, 정보공유 및 업무관리 효율화에 기여하고자 한다. 도면 및 문서관리 또는 행정업무 중심으로 사용되는 기존 프로젝트 또는 사업관리 시스템에서 벗어나 프로젝트 참여자간 커뮤니케이션 및 협업과 관련된 일련의 활동을 지원하는 협업 플랫폼(CCP)을 개발하는 것이 본 연구의 목적이다. 본 연구에서 개발된 CCP는 설문조사를 통해 협업 플랫폼 사용에 따른 효과가 검증되었으며, 기존 커뮤니케이션 또는 협업 방식에 비해 정보공유 및 배포, 기록 및 추적관리가 용이하며, 자신의 업무능력 향상에 기여한 것으로 나타났다.

• 한국항해항만학회지
• /
• 제44권5호
• /
• pp.382-391
• /
• 2020

In line with the trend of global transport volume which has increased rapidly over the years, internal transportation in seaports is always conducted with high frequency. Thus, there is always much potential for traffic jams as well as high transportation costs and emissions. Many efforts have been initiated to streamline the inter-terminal container transport (ITT) through the development of automated vehicles and equipment as well as using private transport facilities to overcome these limitations. The purpose of this paper to develop a framework to design, analyze, and validate the efficiency of a new ITT system in a port area based on the monorail network and automatic vehicles. First, the number of shuttles and loaders was determined depending on the transport demand scenario. Next, a simulation model was applied to evaluate the system performance as well as gain more insight into the working process of the ITT system. Finally, by setting goals for the performance indicators, the results showed that the system was highly efficient with 100% of the containers delivered to their destination on time. Besides, a series of other performance tracking was provided to provide insight into the system's capabilities.

• 대한기계학회논문집B
• /
• 제36권6호
• /
• pp.669-674
• /
• 2012

최근에 준공된 디큐브시티는 사무용, 상업용, 숙박용 및 관람집회용 등 4개의 시설이 공존하는 복합건물이다. 이 건물에는 필요로 하는 전기와 증기, 온수 및 냉수를 공급하기 위해 구역형 에너지공급시스템(Community energy supply system)이 설치되었다. 다양한 건물설비를 효과적으로 운영하기 위해 건물에너지관리시스템(Building energy management system)의 설치를 검토하고 있다. 본 연구에서는 3개의 열병합발전시스템을 비롯하여 7대의 증기보일러, 2대의 중온수보일러와 2대의 흡수식냉동기 및 4대의 터보냉동기 등으로 구성되는 구역형 에너지공급시스템의 최적 운전 및 설계방법을 검토하였다. 결과로서 에너지 수요변화에 따른 구역형 에너지공급시스템의 최적 운전방법과 계절적 운전조건의 변화가 시스템의 경제성에 미치는 영향을 규명하였다. 또 시설별 규모에 따라 결정되는 에너지 수요가 건물 전체의 에너지 소비에 미치는 영향도 분석하였다.

• 한국재난정보학회 논문집
• /
• 제14권1호
• /
• pp.17-27
• /
• 2018

본 연구의 목적은 자연재난을 경험한 농촌주민을 대상으로 재난 후 개인의 변화와 재해인식, 심리적 스트레스를 알아보고 이에 따른 농촌주민의 재난대책방안을 모색하고자 하였다. 연구대상은 2017년 7월 집중호우로 직간접적인 피해를 입은 충청남도 청주시에 거주하는 농촌주민을 대상으로 하였으며, 설문조사와 인터뷰 방법을 사용하였다. 연구결과 성별에 따른 재해인식에 유의미한 차이가 있었으며, 많은 주민들이 외상 후 스트레스를 겪고 있는 것으로 나타났다. 마지막으로 본 연구의 고찰 및 제언을 통해 농촌주민의 재난 후 성장을 위한 방향을 제안하였다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2010년도 추계 학술발표회
• /
• pp.1065-1072
• /
• 2010

The excavation site in the new city of inchon songdo is distributed with soft reclaimed soil and marine deposit. So, the general ground anchor is not applied to this layer of soft ground as the earth retaining support system, because of settlement. And then, Jacket pack anchor which is newly developed in order to increasing the pullout resistance by certain grout bulb formation and expansion effect in soft ground is applied to this site instead of the general ground anchor. Though the maximum horizontal displacement shows about 30mm~100mm (The maximum horizontal displacement/excavation depth$\fallingdotseq$0.32~1.0%) according to excavation sequence, generally excavation work finished stably. Also, load cell after setting shows almost increasing trend with increasing horizontal displacement. It means that the settlement of Jacket pack anchor in soft ground is good. From the result of this case, we knew that Jacket pack anchor was able to use the earth retaining support system in soft ground. Using Jacket pack anchor in soft ground, The allowance of the horizontal displacement is applied more than general value considering soil factors.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 제39회 하계학술대회
• /
• pp.679-680
• /
• 2008

Most of the small wind turbines are set as the stand alone type in the area where the access to the grid is difficult and compulsorily uses the battery. Depending on the volume of the battery, securing of the space necessary, and has the shortcoming of replacing the battery periodically due to it's limited working life span. Recently, setting up in the vicinity of the city area is increasing and the trend of using the Grid inverter instead of battery is also increasing. This thesis is aiming mainly analyzing the characteristics of the output power of the Prototype Permanent Magnet Generator(PMG) and the Grid-Inverter and to verify through the theoretical study and tests. Tested the characteristics of the output power of the PMG through the stage 1-2 and at the stage 3 connected the output of the PMG to the Inverter and tested the characteristics of the Inverter. And at the stage 4, the maximum output power is confirmed by the continuous running test of the PMG.

• 한국측량학회지
• /
• 제32권6호
• /
• pp.591-597
• /
• 2014

A wide variety of image application methods, such as aerial image, terrestrial image, terrestrial laser, and stereo image point are currently under investigation to develop three-dimensional 3D geospatial information. In this study, matching points, which are needed to build a 3D model, were examined under diverse weather conditions by analyzing the stereo images recorded by closed circuit television (CCTV) cameras installed in the U-City. The tests on illuminance and precipitation conditions showed that the changes in the number of matching points were very sensitively correlated with the changes in the illuminance levels. Based on the performances of the CCTV cameras used in the test, this study was able to identify the optimal values of the shutter speed and iris. As a result, compared to an automatic control mode, improved matching points may be obtained for images filmed using the data obtained through this test in relation to different weather and illuminance conditions.

• 한국수소및신에너지학회논문집
• /
• 제13권2호
• /
• pp.127-134
• /
• 2002

A Study on the application of ultrasonic with high frequency is carried out as a plan to rise the efficiency of the hydrogen fuel production in an electrolysis of water. KOH is selected as an electrolyte and concentrations are 0 %, 10 %, 20 %, and 30%. The solvent is city water. A measurable device of buoyancy by an electronic balance and a measurable device of voltage with a sensor of pressure are planned newly as a measuring device to measure the quantity of hydrogen production. An ultrasonic transducer with high frequency of 2 MHz is selected to give them the ultrasonic forcing. In results, it is clarified that ultrasonic influences the decrease of overpotential in the electrolytic solution. And basic data according to the pole interval and the temperature are obtained.

• World Technopolis Review
• /
• 제1권2호
• /
• pp.92-106
• /
• 2012

This study focuses on exploring the behaviours of high-tech start-up firms in response to the policy interventions undertaken to promote regional innovation in South Korea since 1997. High-tech start-ups and their technological entrepreneurship are increasingly considered by policy makers and academics to play a crucial role in the generation of innovation and economic development. However, this study started from a basic concern of why government intervention does not necessarily result in an increase of regional innovation capacity. To explain this concern, we constructed a new conceptual framework of 'government dependency' and apply this to 'Daedeok,' a regional innovation system in South Korea, to explore the reproduction of path dependency as an impact induced by innovation policy. This conceptual framework was developed by remodeling path dependency approaches through a systemic and interactive lens. An empirical study used qualitative interviews of start-up founders to delineate the emergence of a new development path and the extent to which dependency was reproduced in the Daedeok regional innovation system. Empirical analysis suggested that 'reliance' and 'persistence' were the crucial factors in the production and reproduction of the government dependency. Some firms accepted dependency as reliance, but others regarded it as policy utilization. Thus, a critical juncture could not be clearly identified in actors' behaviour. It was also unclear if dependency had hindered innovation, but it was shown that the regional and institutional contexts strongly influenced the reproduction process. The study concludes that the construct of government dependency can also provide useful insights into policy learning as well as the success of government interventions.