• Title/Summary/Keyword: Obstacle Factors

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The Navigation Algorithm of Mobile Robot based on Passive RFID Tag (수동 RFID Tag를 기반으로 한 이동 로봇의 경로 계획 알고리즘)

  • Ji, Yong-Kwan;Park, Jahng-Hyon
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.8
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    • pp.89-95
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    • 2009
  • In this paper, a navigation algorithm is proposed using RFID tags in indoor environments. Firstly, a stochastic sensor model of RFID is derived and the design factors including the maximum identifiable distance, the identification direction and the read success rate are obtained through experiments. The obstacle avoidance algorithm is developed with consideration of those factors for a variety of RFID antenna configurations and different indoor environments. The algorithm is tested by computer simulations and implemented on a mobile robot.

Semi-3D Path Planning using Virtual Tangential Vector and Fuzzy Control (Virtual Tangential Vector와 퍼지 제어를 이용한 준 3차원 경로계획)

  • Kwak, Kyung-Woon;Jeong, Hae-Kwan;Kim, Soo-Hyun
    • The Journal of Korea Robotics Society
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    • v.5 no.2
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    • pp.127-134
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    • 2010
  • In this paper, a hybrid semi-3D path planning algorithm combining Virtual Tangential Vector(VTV) and fuzzy control is proposed. 3D dynamic environmental factors are reflected to the 2D path planning model, VTV. As a result, the robot can control direction from 2D path planning algorithm VTV and speed as well depending on the fuzzy inputs such as the distance between the robot and obstacle, roughness and slope. Performances and feasibilities of the suggested method are demonstrated by using Matlab simulations. Simulation results show that fuzzy rules and obstacle avoidance methods are working properly toward virtual 3D environments. The proposed hybrid semi-3D path planning is expected to be well applicable to a real life environment, considering its simplicity and realistic nature of the dynamic factors included.

Development and Application of Two-Dimensional Hydrogen Mixing Model in Containment Subcompartment Under Severe Accidents

  • Lee, Byung-Chul;Cho, Jae-Seon;Park, Goon-Cherl;Chung, Chang-Hyun
    • Nuclear Engineering and Technology
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    • v.29 no.2
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    • pp.110-126
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    • 1997
  • A two-dimensional continuum model for the hydrogen mining phenomena in the containment subcompartment under severe accident conditions has been developed to predict the spatial distribution of the hydrogen concentration. The model can predict the distribution of time-dependent hydrogen concentration for HEDL experiments well. For the simulation of these experiments, the hydrogen is mixed uniform within the test compartment. To predict the extent of non-uniform distribution, the dominant factors such as the geometrical shape of obstacle and velocity of source injection in mixing phenomena are investigated. If the obstacle disturbing the flow of gas mixture exists in the compartment, the uniform distribution of hydrogen might be not guaranteed. The convective circulation of gas flow is separately formed up and down of the obstacle position, which makes a difference of hydrogen concentration between the upper and lower region of the compartment. The recirculation flow must have a considerable mass flow rate relative to velocity of the source injection to sustain the well-mixed conditions of hydrogen. Finally, in order to account for non-uniform distribution of the hydrogen due to the geometrical configuration the maximum-to-average ratio is functionalized.

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Key Influence Factors for Efficient Cost Management of Design Stages (설계단계 공사비관리 효율성의 주요영향요인 분석)

  • Woo, Yu-Mi;Song, Jong-Kwan;Cho, Kyu-Man;Lee, Hyung-Jong;Hong, Tae-Hoon;Hyun, Chang-Taek;Koo, Kyo-Jin
    • Korean Journal of Construction Engineering and Management
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    • v.8 no.4
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    • pp.176-184
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    • 2007
  • Recently, in the korean construction industry, the importance of cost management in the building design process has been grown up institutional systems and policies for the cost management of design stages are however weakness. Traditionally, the range of cost management has been limited to the construction stages, and due to inefficiency of the infrastructure such as standards and building cost data for cost management. It has trouble to perform the cost management in building design process. This study intends to derive key influence factors for raising efficiency of cost management. With questionnaire surveys to professionals, we analyze a current situations and the influence of obstacle factors on cost management. Finally, the key influence factors are induced, based on the result of the analysis on influence the obstacle factors.

A Study of Obstacles to Implementing Family-friendly Policies & Offering Flexible Work Arrangements (기업의 가족친화제도 시행의 장애요인과 탄력적 근무제도 활성화 방안에 관한 연구)

  • Han, Ji-Sook;Yoo, Gye-Sook
    • Journal of Families and Better Life
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    • v.27 no.5
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    • pp.207-220
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    • 2009
  • This study investigates the obstacles to implementing family-friendly policies and offering flexible work arrangements and provides policy directions. A survey was conducted of employers at 147 firms, resulting in 42-43 questionnaires being statistically analyzed. Frequencies, means and factor analysis were conducted by SPSSWIN 12.0. The findings are as follows: First, the main obstacle to implementing family-friendly policies was the burden of cost. Second, eight obstacle factors were extracted through factor analysis. They are; lack of replacement workers and concerns about equity issues, nonfamily-friendly culture, no guarantee of the effectiveness of programs, lack of information about the programs or polices, lack of communication and public relations, potential loss of productivity, administrative hassles, and structural obstacles. Third, there was a difference in implementing flexible work arrangements according to the factors of lack of replacement workers and concerns about equity issues and no guarantee of the effectiveness of programs. That is, the firms which didn't have these two obstacles tried to implement flexible work arrangements more than the others.

Exploratory Research on the Obstacle Factors of Aircraft Operations (항공작전의 장애요인에 관한 탐색적 연구)

  • Song, Young-Il;Kim, Hae-Sung
    • Journal of the military operations research society of Korea
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    • v.33 no.2
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    • pp.1-15
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    • 2007
  • Aircraft operation doesn't consider the fact which can became obstacles. Forecasting, Preparing and Planning can make effective aircraft operation. This study is the find out the method of the effective Aircraft military power management. The force try to analysis the obstancles, aircraft operation ability and prepared military power. This study was analysis by ARENA 10.0. The obstacles consider to four category; weather, CBR warfare. aircraft accident and battle damage. And This study conduct the sensibility which can influence the aircraft operation.

A Study on Information Networks for Libraries (도서관(圖書館)의 정보(情報) "네트워크"에 관한 연구(硏究))

  • Kwon, Kie-Won
    • Journal of the Korean BIBLIA Society for library and Information Science
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    • v.4 no.1
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    • pp.23-48
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    • 1980
  • Libraries are social apparatuses made by social needs and functions, each class of services and technology in them were changed and developed variously adapting to chronological conditions. There is reaching the interest about development in the information system to deal with it's all materials effectively, but most of libraries are interfacing from the limit of materials and manpower. Some obstacle factors restrained in the attainment of purposes and is made Sufficiently services by librarians through the information networks for libraries, they devise the utilization of materials widely in libraries and information centers. As the pre-condition of library networks, the mathematical model of organization and it's formular, 29 universities and 7 public libraries in seoul are to make the non-directed and the directed networks, and then the former has 5 groups, the latter has 1 group by the switching center. I studied for the switching centers from 6 groups experimentally. Organization, finances, cataloging and Situation that are some obstacle factors of the information networks for libraries were studied the alternatives of them. When we can have supports of the nation actively for the making networks in geographical and various libraries and get grants of it, many agencies and industries, we can achieve the purpose by social apparatuses in the information society.

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An Optimal Path Generation Method considering the Safe Maneuvering of UGV (무인지상차량의 안전주행을 고려한 최적경로 생성 방법)

  • Kwak, Kyung-Woon;Jeong, Hae-Kwan;Choe, Tok-Son;Park, Yong-Woon;Kwak, Yoon-Keun;Kim, Soo-Hyun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.6
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    • pp.951-957
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    • 2010
  • An optimal path generation method considering the safety of UGV(Unmanned Ground Vehicle) is proposed and demonstrated through examples. Among various functions of UGV, real-time obstacle avoidance is a key issue to realize realistic scenario in FCS(Future Combat Systems). A two-dimensional narrow corridor environment is considered as a test field. For each step of UGV movement, two objectives are considered: One is to minimize the distance to the target and the other to maximize the distance to the nearest point of an obstacle. A weighted objective function is used in the optimization problem. Equality and inequality constraints are taken to secure the UGV's dynamics and safety. The weighting factors are controlled by a fuzzy controller which is constructed by a fuzzy rule set and membership functions. Simulations are performed for two cases. First the weighting factors are considered as constant values to understand the characteristics of the corresponding solutions and then as variables that are adjusted by the fuzzy controller. The results are satisfactory for realistic situations considered. The proposed optimal path generation with the fuzzy control is expected to be well applicable to real environment.

Classification of Subregions in Yeongnam Region (영남지역 내 하위지역 구분)

  • Son, Myoung Won
    • Journal of the Korean association of regional geographers
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    • v.22 no.1
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    • pp.25-35
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    • 2016
  • This paper is to classify subregions of Yeongnam region, to realize their core area, and to provide the basis on studying inherent cultural characteristics in Yeongnam region. To do so, I made a overlay human factors of administrative district and dialect with physical factors of drainage basin and climate area. The limit of subregion is the range of possessing environmental factors similar to provincial center. The parcels possessing a equivalent combination of environmental factors are 27, the size of parcel is various from one-city/county to six-city/county. These parcels are classified to six subregions(Andong, Sangju, Kyeongju, Daegu, Kimhae, Jinju). The boundary of subregion is high mountains and large river which are obstacle to communication between subregions, and in case of little obstacle exists transitional zone.

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A Study on Factors Influencing Corporate Patent Activities on Management Performance (기업의 특허활동이 경영성과에 미치는 영향 요인)

  • Park, Eun-Mi;Seo, Joung-Hae
    • Journal of the Korea Convergence Society
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    • v.12 no.2
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    • pp.271-277
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    • 2021
  • Companies are actively engaged in various innovation activities and intellectual property rights activities such as patents in order to survive in a fiercely competitive global environment. The purpose of this study is to understand the factors that influence corporate patent-related activities on business results. For this reason, we conducted a questionnaire survey of patent practitioners and R & D personnel of Chinese companies, and analyzed the causal relationship using PLS analysis tools. As a result of the analysis, it was found that compensation and obstacle factors have a significant effect on information sharing (collaboration)... It was found that information sharing (collaboration) has a significant impact on technology complementation (improvement) and corporate image. It was also found that technical complementation (improvement) and corporate image have an impact on management results. The results of this study will be able to find and strategically utilize the factors that promote and encourage companies to develop their patent activities.