• Tunnel and Underground Space
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• v.4 no.2
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• pp.192-200
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• 1994

Underground offers many advantages for storing agricultural and marine products. Since it is confined by thick walls of rock it is easy to control temperature and humidity and to achieve air and water tightness. Also, damages by rodents and insects could be avoided. Flexibility in choosing the location is another advantage that underground could offer. Consequently the goods could be stored near the big city to meet the demand change. Because of these advantages, many underground food storage facilities were built and operated successfully in U.S. and many Euroupean countries. On the other hand, there is no underground food storage facilities in Korea despite the need is growing rapidly. This paper describes the case studies of foreigh food storage and technologies related to food storage were analyzed and evaluated. Also performed is analysis of domestic technologies for construction and operation of underground food storage facilities to deduce the fields of studies that have to be conducted.

• Research in Mathematical Education
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• v.13 no.4
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• pp.331-339
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• 2009

The research on the Olympic mathematics education has become an internationally recognized educational activity. In some cities of China, especially big cities, the Olympic mathematics education is developing like raging fire. Many parents send their children to training school to get the Olympic mathematics education, no matter whether the children are willing to or not. They hope that through the training, their children can be outstanding when entering higher school. However, this practice has deeply affected children's learning initiative. In this paper, we analyzed both the history and the present situation of the Olympic mathematics education in China. We have some suggestions based on the problems emerging nowadays.

• Knowledge Management Research
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• v.4 no.1
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• pp.55-66
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• 2003

Knowledge Management is introduced by many big companies with the development of Information Technology. Although researches about the enabling conditions have been progressed, but there are few study of relationship between KM stages and enabling conditions, and performance. This study focus on the KM four activities and KMS(Knowledge Management System), which is on the Samsung SDS's KMS(they called ARISAM) and related with team performance. We are propose some points to the managerial implications.

• Journal of Korea Multimedia Society
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• v.20 no.1
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• pp.51-57
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• 2017

The purpose of this study is to design a system that can be used for military simulation and virtual training using the location information of individual soldier's weapons. After acquiring the location information using Arduino's GPS shield, it is designed to transmit data to the Smartphone using Bluetooth Shield, and transmit the data to the server using 3G/4G of Smartphone in real time. The server builds the system to measure, analyze and manage the current position and the tracking information of soldier. Using this proposed system makes it easier to analyze the training situation for individual soldiers and expect better training results.

• Annual Conference of KIPS
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• 2019.10a
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• pp.85-88
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• 2019

4차 산업 혁명의 진행에 따라 빅 데이터를 활용한 다양한 응용 분야와 프로그램들이 생겨나고 있다. 이에 따라 기존에 성능 문제가 크게 제기되지 않았던 복사, 해쉬 계산 등의 문제에 대한 요구사항이 디지털 포렌식이나 디지털 데이터 기록물 보존 등의 분야에서 급증하고 있다. 본 논문에서는 복사, 해쉬가 동시에 진행되는 디지털 데이터 이관 분야에서 활용되는 대용량 이관 시스템을 위해 향상된 성능이 제공되는 알고리즘을 소개하며, 이를 구현한 시스템 구조를 제안한다. 또한 실험을 통해 제안하는 알고리즘이 기존에 활용되던 이관 시스템에 비해 평균 39% 향상된 성능을 보임을 증명한다.

• Annual Conference of KIPS
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• 2019.10a
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• pp.872-875
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• 2019

우리나라의 수출입 화물 물량의 대부분은 항만을 통해 처리되고 있으며, 취급화물의 다양성과 선박의 대형화로 주변 국가들의 항만간 경쟁으로 심화되면서 항만 비용의 증가로 발생되고 있다. 이는 항만업무의 효율화와 생산성의 증가로 비용 감소효과를 바라볼 수 있는데, 4차 산업혁명의 주요 기술인 인공지능(OCR, AI알고리즘, 머신러닝, RPA등)의 기술 적용으로 개선할 수 있다. 본 연구에서는 이와 관련된 실질적 항만업무와 관련된 기술을 적용하여 업무의 효율화와 생산성 증가의 기술적 검증을 통해 항만의 경쟁력 강화와 국가 물류발전의 기술적 향상을 도모하고자 한다.

• Journal of the Korean Society of Mechanical Technology
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• v.13 no.4
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• pp.43-48
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• 2011

The air blowers for fuel cell electric vehicle usually have big difference between inlet and outlet pressure. When the casing of the air blowers is designed, the stress analysis is required. (Approximately Inlet pressure is 0.5bar and outlet pressure is 2bar.) Gap distance between the casing and the impeller is 0.3mm. Therefore, if the amount of maximum deformation of casing is larger than 0.3mm, impeller crashed the casing. In order to avoid crashing, both the thickness and number of rims are changed and carried out simulations on each cases.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.20 no.5
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• pp.334-341
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• 2008

The purpose of this study is to investigate the effects of changing air temperature and the changing on/off periods of the air-conditioner system. Adding to that, this paper discuss is to consider the effects of air temperature with the air-conditioner system upon the human thermal comfort. The experiment is conducted during the summer. The subjects(6 young females) are exposed to the following conditions: combinations of 2 Swing and 2 Linear air control Conditions. (2 Swing during 40 min, 4 Swing during 40 min, Linear 40 min, Linear 60 min in still air and RH 50%). From the experiment, the following results are obtained; the thermal sensation vote is neutral after 90 minute. The mean skin temperature ranged about $34^{\circ}C$ at all conditions. The skin temperature was greatly affected by 2 Swing big amplitude condition.

• Journal of the Korea Safety Management & Science
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• v.5 no.4
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• pp.75-85
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• 2003

Recently, WRMSD(Work-Related Musculoskeletal Disorders) that can be frequently found among simple and repetitious works has been a big occupational safety issue, and has begun to being studied actively by many Korean researchers. However, those researches have been largely relied on foreign ones, due to the lack of basic data in Korea. In this study, we have tried to search the actual conditions and factors on WRMSD of press workers in a local company. In addition, we examined how the contents of works and postures of the workers affect the disease. It is expected that the data collected in this study will be able to used for planning the preventive measures on WRMSD effectively and for implementing its corresponding programs.

• Journal of the Korea Society of Computer and Information
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• v.23 no.1
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• pp.111-116
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• 2018

Recently, IoT and Big Data dealing with voluminous and complex sensitive information is one of the key issues in the era of the 4th industrial revolution. There have been a lot of studies to store the collected and processed sensitive information safely in storage data. Especially biometric information, if it is leaked and becomes identity theft, is hard to be corrected and results in serious event. To fix the problem, methods such as FIDO or KFTC have been proposed. In this paper, we propose a modified method of TTAK.KO-12.0098 according to the environment of this paper and propose a method of safely storing the generated disposable template in a block chain. We show that our method is better by comparing the existing method and the security analysis.