• Journal of Energy Engineering
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• v.15 no.3 s.47
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• pp.194-201
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• 2006

Greenhouses should be heated during nights and cold days in order to fit growth conditions in greenhouses. Ground source heat pump (GSHP) systems are recognized to be outstanding heating and cooling systems. A horizontal GSHP system with thermal storage tank was installed in greenhouse and investigated the performance characteristics. The reasons for using thermal storage tank were discussed in detail. Thermal storage tank can provide heat for heating load that is larger than GSHP system heating capacity. The results of study showed that the heating coefficient of performance of the heat pump system was 2.69.

• Vending industry
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• v.10 no.2
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• pp.105-118
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• 2010

자판기 영업은 다양한 내용상품을 대상으로 하는 만큼 관련되는 법령들도 복잡하기 그지없다. 하나하나 세심히 체크하고 대응하지 않으면 정말 몰라서 불이익을 당하는 경우가 많다. 따라서 자판기 영업을 시작하려는 사람은 물론 현업에 있는 사람들도 관련법령을 잘 숙지하려는 노력을 게을리 하지 말아야 한다. 이번 특별기획에는 자판기 관련법령을 체계적으로 숙지할 수 있게 하기 위해 [자동판매기 영업자 관련실용 법형풀이]를 마련했다. 여기에 들어가는 내용들은 법제처의 <찾기 쉬운 생활정보 법령> 사이트에서 발췌, 정리했음을 밝혀둔다. 법체처의 <찾기 쉬운 생활정보 법령>은 국민이 실생활에 필요한 법령을 쉽게 찾아보고 이해할 수 있게 만들어 졌다. 정부 각 기관의 업무 중심으로 복잡하게 얽힌 법령간의 관계를 국민의 생활 중심으로 재분류해 쉽재 해설하여 제공하는 새로운 법령정보 서비스 제공 시스템이다. 여기에는 자판기 영업자들이 숙지해야할 관련 정보들이 자세하고 친절하게 안내되어 있는데 본 전문지의 특성에 맞게 현업 운영자들에게 도움이 되는 정보 위주로 선별해 게재를 했다. 이번호에는 <자동판매기 영업 관련법제>, <자동판매기 업종선택 시 유의사항>，<자동판매기 설치장소 확보>에 관한 법령들을 게재했다. 이미 알고 있는 내용들이라 하더라도 일목요연하게 정리된 내용들을 보게 되면 새로운 시장 통찰력을 얻는데 도움이 되리라 보여진다. [자동판매기 영업자 관련 실용 법령 풀이]는 다음호에도 연재가 될 예정이다. 독자님들이 이 법령 풀이 정보를 잘 숙지 활용해 사업에 도움이 되었으면 하는 바램이다. 아울러 본 귀중한 정보를 만들어 제공해 주신 법제처 관계자분들에게 감사를 드린다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.9
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• pp.55-63
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• 2003

An attitude control system using reaction thrusters for the upper stage of a launch vehicle is considered. The thruster configuration (position and direction) determines control system response, fuel consumption, effective torque and system fault tolerance. We propose a procedure for finding the optimal thruster configuration with desired control effectiveness over the range of selected torque commands. An optimization technique called Particle Swarm Optimization is used for the numerical experiments. The validity of the solution is checked through computer simulations.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.143-147
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• 2011

3월11일 오후 2시46분경 일본 동북지역을 중심으로 M. 9.0 규모의 동일본대지진이 발생해 수많은 희생자가 나왔다. 지진발생 후 쓰나미가 일어나 방사선이 대량으로 유출되는 등 일본사상 최대의 국가적인 복합재난이 일어났다. 그럼에도 불구하고, 일본인들이 침착함을 잃지 않은 시민의식에 대해 세계 시민들은 극찬을 아끼지 않았다. 우리나라도 국가적으로는 대형 재난발생 시를 대비하여 행정안전부, 방송통신위원회, 소방방재청, 기상청, KBS, 재난전문가 등으로 구성된 가칭 "긴급재난방송협의회" 같은 것을 구성하여 긴밀하게 재난정보를 교환하는 유기적인 협력체제구성이 필요하다. 또, 나아가서는 이들 관련 부서에서는 재난방송 전담관을 두어 재난방송에 적극적으로 대처하여야 할 것으로 본다. 정부도 KBS에 대해 대폭적인 지원을 아끼지 않아야 하겠지만, KBS 또한 지금까지의 대응 자세에서 벗어나 "재난방송의 선진화"를 위해 재난방송시스템을 새로 구축해야 할 것이다. 마지막으로 KBS는 NHK의 지상파방송과 같이 KBS 위상에 걸 맞는 재난방송시스템을 구축하는 한편, 디지털시대에 있어서의 뉴 미디어를 이용하여 DMB나 스마트 폰, SNS 등을 이용한 각종 재난경보체제를 선도해야 할 재난주관방송사로서의 의무가 있다. 그것이 곧 공영방송의 본연의 임무이자 국민의 생명과 재산을 지키는데 최선을 다하는 길이다.

• Journal of Advanced Navigation Technology
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• v.16 no.4
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• pp.717-722
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• 2012

Disaster management system can prepare enough for a social disaster. In addition, it is measures to reduce damage. When, where and how to prepare for a disaster will happen we can not expect an appropriate sense of crisis, disaster response and is the right choice early. In this paper, the next national disaster safety sector effective use SNS will find ways. To do this successfully in the field of international disaster safety use cases and measures are derived that can be applied to our country. As a result, comprehensive and systematic introduction of disaster management system to minimize the damage will contribute effectively to the rapid disaster recovery.

• International Commerce and Information Review
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• v.15 no.2
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• pp.411-428
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• 2013

This study presented practical directions for logistics network unification services, storage and shipment automation in order to prepare advanced strategies for warehouse management systems(WMS) of e-trade using network technology. The WMS technology using UPnP network will be a new paradigm in logistics and distribution. To meet desires of our society and develop successful unified logistics services, what is proposed in this study should be properly performed and it is important to have proper attitude to deal with new changes. Therefore, this study aims to present a base for interpretation of WMS using UPnP network rather than its technological directions.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.2
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• pp.147-152
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• 2014

A longitudinal modal transmission-line theory(L-MTLT) to analyze the static and dynamic behavior of two-section distributed feedback (DFB) lasers is used. The characteristic impedance and equivalent propagation constant of DFB structure with active layer are derived from L-MTLT. A two-section DFB laser is analogous to a transmission-line network, in which each section is described by transmission-line block corresponding to the equivalent factors. The longitudinal resonant condition of DFB laser based on equivalent transmission-line network is used to reformulate the rate equations so that static and dynamic behavior of two-section DFB lasers with active layer is demonstrated and analyzed accurately.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.1
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• pp.27-33
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• 2009

Human postural responses appeared to have stereotyped modality, such as ankle mode, knee mode and hip mode in response to various perturbations. We examined whether human postural control gain of full-state feedback could be decoupled along with the eigenvector. To verify the model, postural responses subjected to fast backward perturbation were used. Upright posture was modeled as 3-segment inverted pendulum incorporated with feedback control, and joint torques were calculated using inverse dynamics. Postural modalities such as ankle, knee and hip mode were obtained from eigenvectors of biomechanical model. As oppose to the full-state feedback control, independent eigenvector control assumes that modal control input is determined by the linear combination of corresponding modality. We used optimization method to obtain and compare the feedback gains for both independent eigenvector control and full-state feedback control. As a result, we found that simulation result of eigenvector feedback was not competitive in comparison with that of full-state feedback control. This implies that the CNS would make use of full-state body information to generate compensative joint torques.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.25 no.6
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• pp.511-516
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• 2016

Guaranteeing the safety of human workers around robots has become an important issue with the increasing demand for human-robot collaboration in industrial production lines. This study proposes a robot manipulator equipped with a counterbalancing mechanism that reduces the power of actuators required to drive the robot, thus keeping a human worker safer in a human-robot collaborative environment. A counterbalancing torque that exactly cancels out the gravitational torque in the proposed mechanism is generated by restoring the force of a spring in the counterbalancing mechanism. A prototype design and experimental results are presented to verify the effectiveness of the proposed method.

• Journal of Information Management
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• v.34 no.3
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• pp.1-19
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• 2003

Due to rapid internet supply, the increase of electronic resources including network resources, and the appearance of metadate, there has been a sudden change in cataloguing fields. To deal with rapid changes, the related organizations such as IFLA are organizing the research team and revising rules. This study analyzes current trend of cataloguing digital resources, considering recent matters in regards with the revision of ISBD(ER), AACR2R 2002 edition, MARC 21, Dubin Core, KCR4 etc. This research discusses also the questions of how digital resources are organized; automatic indexing, matadata, and MARC format.