• Nuclear Engineering and Technology
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• 제52권7호
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• pp.1587-1596
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• 2020

The location selection for nuclear power plants (NPP) is a strategic decision, which has significant impact operation of the plant and sustainable development of the region. Further, the ranking of the alternative locations and selection of the most suitable and efficient locations for NPPs is an important multi-criteria decision-making problem. In this paper, the non-sequential Monte Carlo probabilistic method and the Latin hypercube sampling probabilistic method are used to evaluate and select the optimal locations for NPP. These locations are identified by the power plant's onsite loads and the average of the lowest number of relay protection after the NPP's trip, based on electricity considerations. The results obtained from the proposed method indicate that in selecting the optimal location for an NPP after a power plant trip with the purpose of internal onsite loads of the power plant and the average of the lowest number of relay protection power system, on the IEEE RTS 24-bus system network given. This paper provides an effective and systematic study of the decision-making process for evaluating and selecting optimal locations for an NPP.

• 한국산림과학회지
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• 제99권1호
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• pp.111-124
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• 2010

본 연구는 자연휴양림 유형별 적정입지선정 평가모형을 개발하고, 그 모형을 자연휴양림 예정지에 적용하여 활용 가능성을 모색하고자 하였다. 이를 위해 델파이 전문가 설문조사와 계층화분석법(AHP)을 이용한 평가준거의 선정, 자연휴양림 유형화 및 유형별 적정입지선정 평가모형 개발, 모형적용 단계의 순으로 연구를 수행하였다. 먼저, 자연휴양림 유형화 및 적정입지선정을 위한 평가준거(Criteria)를 구안하고, 2차에 걸친 델파이조사에 의한 타당화 과정을 거쳐 2개 평가영역(Categories) - 6개 평가항목(Items) - 12개 평가지표(Indicators)의 위계를 가진 평가준거를 선정하였다. 제3차 델파이조사에서는 계층화분석과정(AHP)을 통하여 자연휴양림 유형화를 위한 평가준거의 가중치를 산정하고, 2개의 평가영역(자원성과 이용성)을 중첩하여 자연휴양림을 4개의 유형으로 구분할 것을 제안하였다. 이어 제4차 델파이조사의 계층화분석과정(AHP)을 거쳐 산정한 유형별 평가준거의 가중치를 활용하여 자연휴양림 유형별 적정입지선정 평가모형을 개발하고 자연휴양림 입지예정지에 적용하였다. 적용 결과 휴양림 이용성은 수도권과의 거리에 의해 가장 크게 영향을 받으며, 휴양림의 입지가 수도권에서 가까울수록 유리하다는 것을 확인하였다. 본 연구는 유형별로 자연휴양림을 지정할 때 활용될 수 있을 것이다.

• 한국산업융합학회 논문집
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• 제25권4_1호
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• pp.505-511
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• 2022

The objective of this article is finding optimized locations of active mounts applied to 6-DOF beam structure with two active paths. When sinusoidal excitation forces are applied to the beam structure, secondary forces from two active mounts which can minimize (ideally becoming zero) transmitted forces are calculated mathematically and the vibration attenuation performance is validated through computer simulations. When the force applied to two active mounts are relatively low, those specific locations are considered as optimized location of active mounting system. As the location of mount changes, amplitude and phase of secondary forces in each path are analyzed with 3D plots. Based on the simulation results, a criterion for selecting mounting location is suggested and it would be very useful for selecting actuators for active mounts appropriately.

• 한국조경학회지
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• 제39권1호
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• pp.106-116
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• 2011

생태적 연결성을 확보하고 야생동물의 보전을 위해 생태적 연결통로에 대한 많은 연구가 진행되고 있지만, 현재 야생동물의 서식이 양호한 지점에 대한 보전 대책은 미비한 실정이다. 이번 연구는 생태적 연결성을 확보하는 측면에서 실제 다양한 야생동물이 서식하며 이들의 서식환경이 비교적 잘 보전되어 있는 지역을 선별하는 데 목적이 있으며, 일정 종수 이상의 야생동물이 다양하게 서식하고 서식지 주변의 토지이용특성을 분석하여 공통적 유형을 고르게 갖추고 있는 지점을 '우선보전연결구간'으로 지정하였다. 이를 위해 충청남도 당진군, 서산시, 예산군, 공주시, 부여군 등 5개 시 군을 대상으로 포유류의 다양한 서식이 예상되는 지점 500개를 우선 선정하고, 이 지점에 대해 2계절, 총 2회에 걸쳐 포유류 서식 현황을 조사하였다. 조사결과 492개 지점에서 총 12종의 포유류가 서식하고 있었으며, 각 지역별 평균 종수 이상의 종이 출현한 지점은 총 264개였다. 그리고 평균 종수 이상의 종이 출현한 저점에 대한 토지이용현황 분석을 한 결과, 산림, 논, 밭, 하천, 초지, 농촌형 건축물 등을 포함한 5~7개 유형을 가진 지점에서 높은 종 다양성을 보였다. 이를 토대로 평균 이상의 야생동물이 서식하고 공통적 유형을 지닌 지점을 "우선연결보전구간"으로 정의하였으며, 총 89개 지점을 선정하였다.

• International Journal of Internet, Broadcasting and Communication
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• 제13권4호
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• pp.135-142
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• 2021

Estimating the locations of workers in a shipyard is beneficial for a variety of applications such as selecting potential forwarders for transferring data in IoT services and quickly rescuing workers in the event of industrial disasters or accidents. In this work, we propose a human movement stream processing system for estimating worker locations in shipyards based on Apache Spark and TensorFlow serving. First, we use Apache Spark to process location data streams. Then, we design a worker location prediction model to estimate the locations of workers. TensorFlow serving manages and executes the worker location prediction model. When there are requirements from clients, Apache Spark extracts input data from the processed data for the prediction model and then sends it to TensorFlow serving for estimating workers' locations. The worker movement data is needed to evaluate the proposed system but there are no available worker movement traces in shipyards. Therefore, we also develop a mobility model for generating the workers' movements in shipyards. Based on synthetic data, the proposed system is evaluated. It obtains a high performance and could be used for a variety of tasksin shipyards.

• 설비공학논문집
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• 제12권5호
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• pp.476-485
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• 2000

This study numerically investigates thermal comfort in a space cooled by the floor-supply air conditioning system, in which three different supply-return locations, one floor supply-ceiling return and two floor supply-floor returns, are treated. A complementary experiment is peformed to validate the present numerical analysis, and the prediction agrees favorably with the measured data. In the numerical procedure, a simplified model mimicking the inlet flow through the diffuser is developed for efficient simulations. The calculated results show that the ceiling return type is far better in thermal comfort than the floor return ones within the extent of this study, which seems to be caused by effective vertical penetration of the supply air against natural convection. It is also revealed that the arrangement of port locations in the floor supply-floor return system has insignificant effect on the cooling performance. For selecting a proper system, other characteristics including the heating performance should be accounted for simultaneously with the present estimation.

• 전자공학회논문지S
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• 제36S권1호
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• pp.93-103
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• 1999

본 논문은 주행중의 자동차에 장착된 카메라의 입력 영상으로부터 이동창을 활용하여 차선을 인식하고 장애물을 감지하는 기법을 기술한다. 영상 정보로부터 장애물을 감지하기 위해서 차선의 위치를 빠른 시간에 추출하는 것이 매우 중요하다. 이를 위하여 한 프레임의 영상에서 차선의 입력이 예상되는 일부분만을 선정하는 기법이 일반적이다. 본 논문에서는 주행 차량의 영상 정보로부터 장애물을 감지하기 위하여, 도로의 곡률에 따라 차선의 입력 예상 위치를 측정하여 크기가 조절된 이동하는 창을 설정하여 정확한 차선의 위치를 추출하고, 나아가 주행 차선 내에 위치하는 장애물을 점출할 수 있는 기법을 제안한다. 이를 고정창을 이용하는 경우와 레이저 혹은 레이터 센서를 사용하는 경우와 비교하여, 정확도가 높음을 보였다.

• 상하수도학회지
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• 제26권1호
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• pp.1-12
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• 2012

The purpose of water distribution system is supplying water to users by maintaining appropriate pressure and water quality. For efficient monitoring of the water distribution system, determination of optimal locations for pressure monitoring is essential. In this study, entropy theory was applied to determine the optimal locations for pressure monitoring. The entropy which is defined as the amount of information was calculated from the pressure change due to the variation of demand reflected the abnormal conditions at nodes, and the emitter function (fire hydrant) was used to reproduce actual pressure change pattern in EPANET. The optimal combination of monitoring points for pressure detection was determined by selecting the nodes receiving maximum information from other nodes using genetic algorithm. The Ozger's and a real network were evaluated using the proposed model. From the results, it was found that the entropy theory can provide general guideline to select the locations of pressure sensors installation for optimal design and monitoring of the water distribution systems. During decision-making phase, optimal combination of monitoring points can be selected by comparing total amount of information at each point especially when there are some constraints of installation such as limitation of available budget.

• 무역학회지
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• 제44권6호
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• pp.345-361
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• 2019

In recent years, Chinese firms have explosively increased outward foreign direct investment (oFDI). While state-owned enterprises (SOEs) are still dominant in Chinese oFDI, privately-owned enterprises (POEs) are also accelerating their internationalization. These two types of Chinese firms differ in their behavior regarding oFDI. The objective of this paper is to analyze the differences in the choice of oFDI locations between Chinese SOEs and POEs by considering host country factors. By integrating the literature on Chinese firms' oFDI and on FDI locations, we developed six hypotheses concerning how host country factors affect their choice of location. We tested our hypotheses by conducting multiple regression analysis with recent secondary data on 413 Chinese MNEs in 88 countries between 2005 and 2016. The results of the test show that in selecting oFDI locations, Chinese SOEs invest relatively more in countries with richer natural resources, more abundant strategic assets, less production efficiency, higher political risk, and lower institutional quality compared with Chinese POEs. It is our hope that the empirical results of this paper will contribute to research on Chinese oFDI.

• 한국암반공학회:학술대회논문집
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• 한국암반공학회 2008년도 국제학술회의
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• pp.287-300
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• 2008

Airflow distributions along tunnel and over the cross section are critical in selecting installation location of the velocity monitor to obtain the representative data for ventilation as well as fire safety systems. This paper aims at performing CFD and on-site studies to analyze the longitudinal and cross-sectional distributions of the air velocity in tunnels employing longitudinal and semi-transversal ventilation systems. This study can ultimately contribute to selecting the monitor type as well as the optimal installation locations in vehicle tunnel.