• 대한조선학회논문집
• /
• 제38권3호
• /
• pp.117-122
• /
• 2001

함정에 탑재되는 주요장비는 내충격성능을 확인하기 위해 충격시험을 실시하고 계측된 신호는 최대충격가속도, 지속시간, 응답스펙트럼 등 충격응답신호의 신간이력을 분석한다. 그러나 계측된 신호는 배경잡음, 계측기오차, 케이블의 과도운동 등으로 충격성잡음과 백색잡음으로 인한 신호왜곡이 발생할 수 있으므로 충격시험으로부터 정확한 시간이력을 추출하기 위해서는 이러한 잡음을 제거해야 한다. 충격성잡음은 중간값필터를 이용하여 제거하고 백색잡음은 웨이블렛의 계수값을 축소함으로써 잡음이 제거된 충격응답신호의 시간이력으로부터 정도높은 최대충격, 지속시간 및 충격응답스펙트럼이 획득가능하다. 제안된 기법의 타당성을 판단하기 위해 수치 시뮬레이션을 수행한 결과 신호대잡음비가 30dB 이상 향상되었음을 확인하였고, 실제계측된 수중폭발충격신호에 적용시켜 향상된 충격응답스펙트럼을 추출하였다.

• STI Policy Review
• /
• 제9권1호
• /
• pp.77-98
• /
• 2018

In the past few decades, the importance of dynamics of University-Industry Linkage(UIL) in strengthening national and regional innovation competency and global competitiveness has been progressively more acknowledged. However, establishing an effective UIL for a better economic development is still a challenging endeavor in Ethiopia, particularly in Tigray region. This study is aimed at assessing the status of UIL and in order to achieve such aim it analyzed the determinants of firms' intensity of interaction with the Mekelle University (MU) and the effect of the intensity of interaction on the relevant firms' innovation performance. The findings of the study showed that the status of UIL between the firms and the university in Tigray region was at an infant stage. The study also found that firm size, firm age (startups) and government supports have had a significant effect on firms' intensity of interaction with the MU. However, the firms' intensity of interaction with the MU did not have any significant effect on the firms' innovation performance. In contrast, cooperation with customers, other groups and suppliers, firm size, firm age, and in-house R&D activities were found to have a significant effect on the firms' innovation performance. In conclusion, the acquisition of knowledge and technology from university does not have an important role in firms' innovation performance in the studied region. Consequently, the government should design effective strategies and assign responsible bodies to implement the strategies, create awareness, and organize both firms and university to meet and work together in order to enhance firms' innovation performance.

• 한국도서관정보학회지
• /
• 제55권1호
• /
• pp.47-67
• /
• 2024

본 연구의 목적은 공공도서관 장서개발에 영향을 미치는 요인을 분석하기 위함이다. 이를 위해 공공도서관 사서를 대상으로 인식조사를 시행하여 장서개발정책과 수서 업무 환경, 참고정보원의 중요도 등을 물었다. 분석 결과, 공공도서관 사서 중 80% 이상이 장서개발정책의 필요성에 대해 인지하고 있었다. 또한, 수서 업무 중 다수의 사서들이 대출 현황과 관련된 사항들을 우선하여 업무에 적용하고 있었으며, 문학상/학술상 수상도서, 신문/잡지, 미디어, 각종 도서 관련 협회 등의 참고정보원의 중요도가 높은 것으로 나타났다.

• 한국문헌정보학회지
• /
• 제22권
• /
• pp.109-141
• /
• 1992

University library must have a substantial collection development policy, by which the short and long term plannings are set up to meet the goals of university education and to support university function. Only when university library organizes collection building based on the well-planned policy, can it establish the systematic collection building, which can satisfy users, support continuity of work, use budget efficiently, and solve the space problem by with-drawing the materials. But most Korean university libraries, contrary to many foreign cases, don't have proper systematic collection development policy or guideline that controls overall library work from planning the collection of materials to evaluating and preserving them. Questionaire on whether university library has collection development policy or guideline was answered positively by only 6 cases out of 57 cases, which is just 10.5 percent. Even in cases that they have a guideline, the content of the copied guideline they sent was confined to acquisition, which is just a part of collection development. Collection development is a statement needed to set up long and short term plannings in consideration of the aims of the library and the needs of users and to shape and manage the library collection systematically. With the above conception and definition, we try to make a proper collection development policy and guideline for the Korean university libraries. Here we must define the object of the university. Object of university is to have good curriculum, good courses, research activities on the part of the faculty, enlargement of graduate school, and establishment of various institutes, etc. And in guideline, selector, method of selection, level of selection and arrangement of budget, etc. must be described concretely in its contents. Since collection development policy and guideline of Korean university libraries should concern their situation, we must confer with the result of the survey and analysis on the matter of collection determination. Here the contents include the priority of materials to be collected, method of collecting materials, arrangement of budget, and others. The purpose of this study is to develop a tenative collection development guideline in reference to the Jeonju University Library by means of analyzing the guiding principle, contents of the guideline, and present conditions of the Korean university libraries. The systematic collection development based on the Guideline for Collection Development of the Korean University Library, can offer a satisfactory service to the users of the university community, and also contribute to the development of the university itself as well as the university library.

• Ocean and Polar Research
• /
• 제28권2호
• /
• pp.175-186
• /
• 2006

There are disputes for oil and gas development between China and Japan in the East China Sea. These involve the area where China is already carrying out activities of oil and gas development and where Japan is proclaiming its EEZ. China insists that the Chinese activities on oil and gas development area are being carried out within the Chinese jurisdictional waters even if the median line principle of Japanese proclamation is applied in delimitation. Indeed, the permit for Japanese development is causing disputes between China and Japan because its permit allows development in the waters adjacent to Chinese development area. h the event, the core of this dispute around the oil and gas field in the East China Sea relates to issues of maritime boundary delimitation and issues of resources acquisition with both states. Chinese policy on oil and gas development is to first consider development issues in accordance with a median line principle where waters toward to China from the median line should be developed by China and the area toward Japan from the median line within the Chinese continental shelf should be jointly developed. However, the Japanese position is that the East China Sea should be jointly developed, and Japan hopes to eventually convince China to accept its median line delimitation. With on-going development of such issues, Korea should establish a strategy of negotiation based on analyses of resource distributional conditions and other strategic factors in the Korean delimitation area. In particular, Korea should prepare and make the best use of joint development zone established in an agreement between the ROK and Japan concerning the development of the southern part of continental shelf adjacent to both states.

• 한국의학물리학회:학술대회논문집
• /
• 한국의학물리학회 2002년도 Proceedings
• /
• pp.28-31
• /
• 2002

Filmless full-PACS in korea has rapidly been growing, since government had supported collaborative PACS project between industry and university hospital in late of 1995. At the same time, a small company had started PACS business, while the Korea PACS society was being formed. In the beginning, PACS societies had focused on developing peripheral solutions such as DICOM gateway for image acquisition, x-ray film digitizer, and viewing software for research or management of personal image data, while Samsung Medical Center had started installing an imported partial PACS system which had recently upgraded with a new system. In similar time frame, a few hospitals had started developing and installing domestic large scale full-PACS system. Several years later, many hospitals have installed full-PACS system with national policy of reimbursement for PACS exams in November 1999. It is believed that Korea is the first country that adopted PACS reimbursement for filmless full-PACS as a national policy. Both experiences of full-PACS installation and national policy generated tremendous intellectual and technological expertise about PACS at all levels, clinical, hospital management, education, and industrial sectors. There are currently three types of PACS system which includes domestic, imported, and hybrid PACS system with imported solution for core system and domestic solution for peripheral system. There are more than 20 domestic PACS companies and they have now enough experiences so that they are capable of installing a truly full-PACS system for large-scale teaching hospitals. PACS societies in Korea understand how to design, implement, install, manage, sustain, and provide good services for large-scale full-PACS. PACS society has also strength for the highest integration technology of the Hospital Information. However, further understanding and timely implementation of continuously evolving international standard and integrated healthcare enterprise concepts may be necessary for international leading of PACS technologies for the future.

• Journal of Information Processing Systems
• /
• 제8권3호
• /
• pp.409-420
• /
• 2012

The decision-making by agents in games is commonly based on reinforcement learning. To improve the quality of agents, it is necessary to solve the problems of the time and state space that are required for learning. Such problems can be solved by Macro-Actions, which are defined and executed by a sequence of primitive actions. In this line of research, the learning time is reduced by cutting down the number of policy decisions by agents. Macro-Actions were originally defined as combinations of the same primitive actions. Based on studies that showed the generation of Macro-Actions by learning, Macro-Actions are now thought to consist of diverse kinds of primitive actions. However an enormous amount of learning time and state space are required to generate Macro-Actions. To resolve these issues, we can apply insights from studies on the learning of tasks through Programming by Demonstration (PbD) to generate Macro-Actions that reduce the learning time and state space. In this paper, we propose a method to define and execute Macro-Actions. Macro-Actions are learned from a human subject via PbD and a policy is learned by reinforcement learning. In an experiment, the proposed method was applied to a car simulation to verify the scalability of the proposed method. Data was collected from the driving control of a human subject, and then the Macro-Actions that are required for running a car were generated. Furthermore, the policy that is necessary for driving on a track was learned. The acquisition of Macro-Actions by PbD reduced the driving time by about 16% compared to the case in which Macro-Actions were directly defined by a human subject. In addition, the learning time was also reduced by a faster convergence of the optimum policies.

• 한국시뮬레이션학회논문지
• /
• 제32권4호
• /
• pp.59-67
• /
• 2023

프라이빗 블록체인은 허가받은 사람만이 블록체인 네트워크에 참여할 수 있는 강화된 보안정책의 적용이 가능하다. 또한, 개인의 이력 사항의 유효성이 중요한 이력관리 시스템에 활용될 경우 정보의 신뢰성 관점에서 우수한 특성을 갖는다. 하지만 블록체인 기술의 과도한 성능요구사항으로 인해 시뮬레이션을 통한 성능적 특성의 파악은 시스템의 안정적 구현에 도움이 될 수 있다. 본 논문은 이더리움 블록체인 기반의 이력관리 시스템을 구성하면서 성능평가 결과를 활용하는 연구 결과를 제시하였다. 서비스는 개인 경력개발 활동, 자격증 취득 및 수상 결과를 기록하는 포트폴리오의 역할 뿐 아니라, 취업 경쟁력 강화를 위한 진로 설계를 위해 커뮤니티 기능을 제공한다. 또한, 서비스 사용자의 참여 독려로 커뮤니티 기능을 활성화시키고자 어떻게 보상 정책을 적용시킬 수 있는지를 제시한다. 특히, Geth 노드 상에서 거래량에 따라 나타나는 성능 특성의 변화 확인을 통해 적절한 보상 정책을 도출하였다.

• 대한안전경영과학회지
• /
• 제15권4호
• /
• pp.417-425
• /
• 2013

According to industrialization and urbanization the number of increasing cars is attributable to an explosive increase of the vehicle emissions. In this study, in consideration of the population and local transportation characteristics of South Chungcheong Province the environmental and economic cost-benefit analyses are performed to evaluate whether the CNG bus conversion gives what kind of effects. Based on the analysis result the expansion and distribution plan of CNG bus is proposed for South Chungcheong Province, and the local supply policy model is also proposed considering the acquisition and management of the economic situation of CNG charging infrastructure and the small transportation companies.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
• /
• pp.200.1-200.1
• /
• 2010

Solar energy is one of the most promising energy resources in the future. For the application and dissemination of solar energy technologies in various fields, reliable data sets of solar irradiation are needed for engineers, researchers, businessmen, and policy makers. Global horizontal solar radiation is needed for the use of flat plate collector, solar domestic hot water system, photovoltaic devices and passive systems like green house. In many countries, solar radiation data accumulated for more then 40 or 50 years and typical weather data are published with average of more then 30 years. In Korea, those global total radiations are measured for about 30 years. With the connections of computer network, measured data could be transmitted to the central control system at key station through Ethernet lines. The data acquisition systems are connected to be automatically controlled by the monitoring network. Global horizontal solar radiation data 16 locations were measured and averaged from 1982 to 2008.