• Journal of the Korean Institute of Intelligent Systems
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• v.12 no.5
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• pp.432-441
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• 2002

Though many services offer useful information on internet, computer users are not so familiar with such services that they need an assistant system to use the services easily In the case of web sites, for example, the operators answer the users e-mail questions, but the increasing number of users makes it hard to answer the questions efficiently. In this paper, we propose an assistant system which responds to the users questions automatically and helps them browse the Hanmail Net FAQ (Frequently Asked Question) conceptually. This system uses two-level self-organizing map (SOM): the keyword clustering SOM and document classification SOM. The keyword clustering SOM reduces a variable length question to a normalized vector and the document classification SOM classifies the question into an answer class. Experiments on the 2,206 e-mail question data collected for a month from the Hanmail net show that this system is able to find the correct answers with the recognition rate of 95% and also the browsing based on the map is conceptual and efficient.

• Journal of the Korean Electrochemical Society
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• v.6 no.3
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• pp.212-216
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• 2003

The humidification measurement system designed in laboratory was used to measure relative humidity and temperature of reaction gases passing through internal or external humidifier which was used in proton exchange membrane fuel cell test station. The relative humidity of gases was stabilized after $10\~20$ minutes and thus credibility of data could be assured. The effect of relative humidity on fuel cell performance could be analyzed by humidity measurement system. Extreme caution was needed to avoid humidity sensor mal-function or failure which is probable in experiment of high humidity condition near $100\%$. The amount of water carried by gas through humidifier was increased along the flow rate of gas. However, the extent of increase was lowered at high gas flow rate. These phenomena could be analyzed as residence time effect of gas in humidifier.

• Journal of Radiation Protection and Research
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• v.26 no.1
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• pp.35-43
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• 2001

All of sealing capsules to transport a special form radioactive material should be designed and fabricated in accordance with the design criteria prescribed in IAEA standards and domestic regulations. The objective of this study is to demonstrate the safety of a shipping capsule for $^{192}Ir$ special form radioisotope which produced in the HANARO. The safety tests were carried out for the impact, percussion, bending and heat test conditions. And leakage tests were carried out before and after the each test. Also, the safety analyses wert performed using computer codes in order to verify the test results. The capsule showed slight scratches and deformation, and maintained its structural and thermal integrities in all tests without any severe damage or melting. It also met the allowable limits of leakage rate after each test. Therefore, it has been verified that the capsule was designed and fabricated to meet all requirements for the special form.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.482-484
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• 2017

Over the past 70 years, movies and television have revolutionized the way people communicate. However, even with this development, TV has been used only as a means of communication targeting an unspecified number of people due to the restriction of media such as radio waves and movies. However, the development of the Internet and online video has come to a time when 100 million people watch YouTube videos uploaded from the other side of the world by eliminating these restrictions. The message that you want to deliver now can be delivered to anyone, but making the image with these messages remains the last obstacle to communication. To solve these problems, we implemented a web application and a video production program through AWS. This system basically provides the administrator with the video production through the easy interface, the information management and the program on the server on the internet through AWS, the assigned lecture including the computer and the smart phone, the learning materials, And implemented to increase the efficiency of educational video production service.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.9B
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• pp.1360-1368
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• 2010

Recently, as the development of Radio Frequency Identification (RFID) technology becomes active, the demand for services which can electronically manage the history and location information of major trees, including trees for cultural heritage restoration and nurse trees, has been increased. This information has been managed by separated drawings and documents or storing its information into PDAs and then structuring data files through input and computation. But, these methods imply limitations in terms of its extensibility and scalability. This paper has designed and implemented an RFID based Tree History Information System (THIS) for cultural heritage restoration. The purpose of the proposed system is to support to be able to effectively and consistently manage historical information of major trees and improve working processes by implementing mobile RFID services through wireless Internet or Local Area Network (LAN) as mobile communication networks. Through implementation, it is confirmed that the proposed system can manage the historical information of major trees more effectively than conventional methods and also improve previous field working conditions.

• Journal of Convergence for Information Technology
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• v.10 no.1
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• pp.139-148
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• 2020

As the internet and computer technology are developed, there is a need for service of traditional culture that can effectively search and create culture, history, and tradition-related materials in online contents. In this paper, we developed an RDF-based ontology retrieval service platform and verified usability and validity. This platform is divided into triple search, keyword search, network graph search, story search and management, curation management module. Based on this, the search results can be visualized based on the relationship between data, network graph search and story search can be used to easily understand the relationship between the keywords. An platform evaluation was conducted for verification, and it was evaluated that an intelligent search that can easily identify the relationship between information and shorten the analysis and search time than the existing search function.

• Nuclear Engineering and Technology
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• v.25 no.1
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• pp.166-177
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• 1993

A simplified thermal analysis method to evaluate the maximum temperature of the CANDU 37-element fuel bundle within a fuel basket in a given spent fuel dry storage canister has been presented along with the results of sample analyses performed to examine the parametric effects of the ambient conditions on the maximum fuel temperature within a canister. To solve the multi-dimensional heat transfer problem of the complex geometry of rod bundles within a canister where three modes of heat transfer are superimposed, the CANDU spent fuel bundles stored in the dry storage canister are first replaced by equivalent concentric fuel cylinders. The simplified axi-symmetric two-dimensional multi-mode heat transfer problem of the equivalent fuel cylinders is then analyzed with an existing computer code, HEATING5, using additional input data and heat transfer correlations. A comparison between the predicted temperature profile and the mock-up test results shows that the agreement is quite satisfactory.

• 한국지구물리탐사학회:학술대회논문집
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• 1999.08a
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• pp.37-47
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• 1999

Among the geophysical exploration methods, electromagnetic (EM) survey must have the broadest range of instrumental systems and remarkable range of applications. There is a plethora of available techniques and instruments, and the depth of investigation and resolution are highly dependent on the particular systems used according to their operating frequency and source-receiver configuration. This diversity of EM systems, however, provides a wide range of instruments or methodologies to choose in order to select the most appropriate tool for the task in hand. This rather than being a disadvantage, would be a major strength of EM methods. Modern EM equipments are remarkably portable, considering their sophistication. Coupled with major advances in recent computer technology, accurate modeling and interpretation techniques are on the way of continuous development and upgrade which, in turn, make the EM methods to become much more heavily used, especially for engineering and environmental applications. We aim to provide a brief theoretical principles, survey techniques and case histories of some selected EM methods that can be applied to geotechnical and environmental problems in Korea.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2003.11a
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• pp.393-407
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• 2003

공동구매는 ‘가격절감’, ‘위험감소’, ‘거래비용 절감’, ‘참여의식’등의 장점을 가지고 있다. 이러한 장점은 소비자들로 하여금 구매형태에 직ㆍ간접적인 영향을 미치는 것으로 나타났다. 반면 ‘시간지연’, ‘제품다양성 부족’, ‘결제수단’, ‘상품디스플레이’등의 단점을 가지고 있다. 이러한 단점들 역시 소비자들로 하여금 구매형태에 직ㆍ간접적인 영향을 미치는 것으로 나타났으나 반면 한번 거래를 하게 되면 계속해서 거래를 한다는 의견과 앞으로도 거래를 할 생각을 가지고 있으며 주변의 다른 이들에게도 추천하겠다는 생각을 가지고 있었다. 장ㆍ단점과 관련하여 공동구매를 ‘재수용 하는가’와 ‘주변사람들에게 권유할 것인가’를 연구하였다. 본 연구의 목적은 공동구매 특성이 공동구매를 수용함에 있어서 지속적인 수용을 할 것인가와 더불어 주변의 사람들에게 권장을 하는가를 파악하는데 있다. 본 연구에 대한 자료 수집방법은 D대학교의 재학생들을 대상으로 총 100부를 설문 조사하였으며, 수집된 설문지 중에서 불성실하게 응답한 설문지 8부를 제외한 총 92부를 유효한 설문으로 확보하였다. SPSS_WIN 10.0 패키지를 이용하였으며, 대상을 통하여 제품별(종류별) 선호도와 구매시(저가격, 안전성, 배송, 시간절감, 결제편리, 기타) 우선순위를 빈도분석 하였다. 또한 요인분석통한 타당도와 신뢰도 분석하고, 연구변수로 선정한 각 요소들을 이용하여 공동구매의 특성(가격대비 성능, 편리성, 결제안전, 다양한 제품 제공)에 따라 공동구매 재수용도와 주변사람 들에게 권유할 것인가에 영향력 정도를 파악하기 위해 회귀분석을 실시하였다. 조사결과 제품 선호도의 측면에서는 서적&음반, 의류&신발, 컴퓨터&주변기기 가장 선호하는 품목으로서 전자상거래와 거의 흡사하게 나타났으며, 구매시 가장 중요하게 느끼는 요소는 저렴한 가격과 안전&안정성으로 나타났다. 또한, 공동구매 특성에 대한 요인분석 결과로는 하나의 독립요인으로 존재하지만 결재안전, 다양한 제품제공의 요인들이 편리성 요인의 하부요인으로 존재하는 것으로 나타났다. 공동구매 특성이 재수용과 주변사람 권유에 대한 결과로는 재수용적인 측면에서는 ‘가격대비 성능’과 ‘다양한 제품 제공’이 유의한 영향을 미칠 것으로 나타났으며, 주변사람 권유적인 측면에서는 ‘가격대비 성능’이 유의한 영향을 미칠 것으로 나타났고 재수용성과 다르게 ‘다양한 제품 제공’측면에서는 영향을 미치지 않는 것으로 나타났다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.21 no.4
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• pp.365-371
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• 2003

Digital high resolution cameras are widely available, and are increasingly use in digital close-range photogrammetry. And photogrammetry instruments are developing rapidly and the precision is improving continuously. The building of 3D terrains of high precision are possible and the calculation of the areas or the earthwork volumes have high precision due to the development of the techlique of the spatial information system using computer. Using the digital camera which has capacity of keeping numerical value by itself and easy carrying, we analyze the positioning error according to various change of photographing condition. Also we try to find a effective method of acquiring basis data for 3D monitoring of high-accuracy in pixel degree through digital close-range photogrammetry with bundle adjustment for local terrain model generation and 3D embodiment of tumulus. In the study is about to efficient analysis of digital information data fer conservation of cultural properties.