• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.993-998
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• 2006

High-rise apartments have a problem using natural ventilation because of the strong outdoor wind velocity. Conventional high-rise apartments have adopted mechanical ventilation systems to maintain the indoor air quality. However, it leads to the overuse of electricity and the sick house syndrome. Double-skin facade is the alternative for the high-rise building to use natural ventilation and this study is focused on the performance of the box-window, which is a kind of double-skin facades. Indoor wind velocity and HCHO concentrations are analyzed with three types of box-windows: the diagonal type, parallel type and perpendicular type. The airflow is simulated by computational fluid dynamics program. Box-windows reduce the maximum value of indoor wind velocity about 50% compared with the single window and the HCHO concentrations do not have the big difference. Box-windows could be the alternative to enhance the use of the natural ventilation and indoor air quality of the high-rise apartment.

• Journal of Life Science
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• v.28 no.5
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• pp.555-562
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• 2018

Swine influenza virus (SIV) causes one of the most common diseases of the pig population, and its subtypes are determined by hemagglutinin (HA) and neuraminidase (NA). Recently, the SIV subtype diagnosis has been developed. The method using antigen-antibody reaction rather than PCR was mainly used because of the large change in the ribonucleotide sequences of SIV. Here, we have developed 10 diagnostic primer sets through multi-nucleotide sequences alignment of spreaded SIV since 2008 in Korea and then optimized the reaction of the one-step RT-PCR for rapid determination of SIV subtype. In addition, specific primers were designed to early determine the pandemic SIV by detecting unique M sequences proven in highly infectious and virulent subtypes of the influenza H1N1 (pH1N1). Here, some of the SIVs spread in Korea from 2008 to 2014 have been tested to determine the subtypes and pandemic potential of SIV. All diagnostic primer sets were found to be able to accurately determine the SIV subtype and to detect the pandemic SIV. In conclusion, it was confirmed that the optimized one-step RT-PCR analysis using these primer sets is useful for rapid diagnosis of SIV subtypes. These results can be used for development of SIV subtype diagnostic kit to early detect before virulent SIV spreads do.

• Journal of the Korean Geosynthetics Society
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• v.18 no.3
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• pp.11-22
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• 2019

This study was conducted to identify the causes of the unusually high number of rock slope failures during an expressway construction in Yangsan fault system. The shear strength (cohesion and internal friction angle) of 128 slopes of discontinuities including bedding, joint, and fault planes were re-evaluated through the examination of face mapping and back analysis. The re-evaluated values were analyzed and then compared with the existing data and values used in the design. As a result, the re-evaluated cohesion and friction angles were very low compared to the existing data and the values applied in the design. This incongruity was pointed as the primary reason for the rock slopes failures during the construction. This may be related to the inherent features of clastic sedimentary rocks in the study area, and the discontinuities in the sedimentary rocks in this region played a significant role. Especially, bedding discontinuity showed a big difference compared to the existing data. The shear strength depended on the type of discontinuity in case of clay filled in discontinuity. However, shear strength was independent on the type of discontinuity in case of shattered materials filled in discontinuity.

• Korean Security Journal
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• no.33
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• pp.81-101
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• 2012

A sudden change of social structure makes the nations have experienced terrorism to establish an anti-terrorism law and associate with international agreements to protect themselves from terrorism. Korea is exposed to terrorism as it has grown in stature by holding the international occasions and has been easy to travel abroad since 1980. Korea regulates the terrorist by a guideline which was established in 1982 by the presidential instruction and other criminal law. However, the majority of people doubt the propriety of overinterpretation of the law and punishment for terrorism. To cope with the situation strongly, it is better to establish an anti-terrorism law to block terrorism and apprehend the terrorist beforehand. Also we should realign an anti-terrorism organization that should be organized by the type of terrorism. In addition, we can expect to avoid waste of a budget and human efforts if we introduce terrorism warning system and face with each stage of situation. Lastly it is possible to prevent terrorism if we build up preventive actions along with the local residents.

• Journal of Korean Elementary Science Education
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• v.26 no.4
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• pp.359-371
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• 2007

The purpose of this study was to investigate elementary school students' conceptions of gas and analyse the type of alternative conceptions of gas which students constructed. To appreciate the conceptions formed by elementary school students on this topic, 173 sixth grade students from an elementary school located in Suwon participated in this study. Additionally, their conceptions and their alternative conceptions of gas represented by the questionnaires were analyzed. The questionnaires consisted of 11 questions related to the conception of gas. To analyze the types of alternative conceptions which presented themselves, constructed prototypes were generated by interviewing the students themselves. From our results, we suggest that sixth grade elementary school students have various conceptions of gas and tend to think that gas is weighty, and that gaseous volume decreases by pressure. However, their conceptions of gas melting in water were very low, as only about 16% of students were aware of this scientific conception. Students who did not understand precisely the conception of the nature of oxygen, carbon dioxide and hydrogen were over 20%. The results of the interviews showed that the construction of alternative conceptions of gas was affected by various and complex causes.

• Proceedings of the Korea Technology Innovation Society Conference
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• 1999.05a
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• pp.409-419
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• 1999

전기기술은 기술의 특성상 민간에 대한 유인이 적은 공유성 기술이나 대학 또는 기업이 감당하기 어려운 대형복합기술의 비중이 높으며, 최근 들어 전력산업의 구조개편 등에 따라 국가적 기술개발수요가 확대됨과 동시에 전기기술의 이용분야 확대와 타 기술과의 융합화 및 대형화로 신기술수요가 늘어나고 있다. 현재 우리 나라의 전기기술 R&D체제에서는 공공기술에 대한 사각지대가 발생하고 있음에도 불구하고 국가차원의 R&D 공급이 미약하여, 거대한 시험설비와 첨단고가장비를 필요로 하는 시스템기술로 일부 기기나 시스템운용을 제외하고는 개별기업이나 전력회사에 대한 기술개발 유인이 크지 않으며, 따라서 전기기술분야의 R&D 실태 파악과 역할에 대한 검토를 통해 R&D 주체별 기관특성에 맞는 국가 R&D체계의 정립이 필요한 실정이다. 따라서, 앞으로는 전기기술분야의 국가 R&D 목표 및 기본전략에 따라 국가 R&D 자원의 규모, R&D 주체간의 역할분담 등 전반적인 R&D 체계의 구축이 선행되어야 하며, 이를 통해 기관별 Mission 및 고유기능을 토대로 전문성 제고와 특성화를 유도할 수 있는 연구여건의 조성이 시급하다 하겠다. 특히, 장기대형연구, 원천기술연구, 기초기반연구, 연구기반구축, 인력양성 등 필수적 국가기능에 대해서는 기관별 특성에 따라 안정적인 역할수행이 가능하도록 역할분담 및 정책적 지원을 하되, 그 밖의 영역이나, 민간 및 전력회사의 독자적인 R&D에 대해서는 경쟁 및 협력을 통한 연구효율성 향상을 유도하는 방향으로 나가는 것이 바람직할 것이다. 국가적 전력기술 R&D의 효과적인 수행과 실효성 확보를 위해서는 재원확보가 선행되어야 하며, 이를 위한 방안으로는 기존의 전력사업자에게는 기술개발충당금 또는 전기요금 중 일정비율을 국가적 R&D 재원으로 설정할 수 있을 것이며. 신규 사업자에게도 규제비용의 차원에서 일정 부담금을 부과하는 방법이 가능할 것이다. 이러한 재원을 가지고 사업성격 및 R&D 유형에 따라 역할분담에 따른 지원, 정책적 사업, 경쟁적 사업공모 등을 통해 지원분야 및 규모, 대상기관 등에 대한 선별적인 지원이 이루어져야할 것이다.

• Korean journal of communication and information
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• v.65
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• pp.5-26
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• 2014

This research investigated to what extent social media use and motivation contributed to the bridging/bonding social capital and social, political participation by using the national survey on high school and university students. In particular, this research divided social media into two groups: open and closed one. The result of analysis showed that the use of open social media reinforced bridging social capital and that of closed social media did bonding social capital. Motives for social media use affected both bridging social capital and bonding social capital. Social media use and motive all had a positive influence on social, political participation. In conclusion, the effect of social media on social capital may be decided by the characteristics of social media and the purpose of social media use.

• The Korean Journal of Ecology
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• v.28 no.3
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• pp.157-161
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• 2005

In order to investigate the geographical variation of Glycine soja distributed in southern area of Korean peninsula, 8 local populations(Sokcho, Wonju, Mt. Chiak, Cheongju, Andong, Taegu, Ulsan, Sacheon), which located from $34^{\circ}50'00"N$ to $38^{\circ}12'00"N$, were selected according to their latitudes and geographical distances. The seeds of these populations were collected and their contents of mannose and galactose were investigated, Mannose contents in the seeds were variable in the range between the highest 460.00 mg/g (Andong) and the lowest 55.23 mg/g(Sacheon). The contents of galactose were represented remarkable differences from 67.17 mg/g(Sacheon) to 387.50 mg/g(Ulsan) also. The local populations were classified into 3 types such as the middle southern inland type (Andong, Taegu), the middle northern type(Wonju, Mt. Chiak, Cheongju) and the coastal type(Sokcho, Ulsan, Sacheon) according to the ratio of mannose and galactose, which indicate the hardness of seeds in Leguminosae, ranged from 0.41 to 1.73. Particularly, those of middle southern inland populations represented the high values compared with those of other populations.

• Korean journal of communication and information
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• v.39
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• pp.40-68
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• 2007

Despite many efforts to improve water and publicize Arisu, ordinary citizens' distrust in water is still intense. This study aims to analyze how newspapers, television and internet media in Korea covered water-related news, focusing on the type of articles, themes, news sources, and news values. As a result, the mostly mentioned theme in the media was the discussion about suitability of water as a drinking water, followed by impurified water, governmental policy on water, coverage on the water pipe, and result of examination of water quality. Also among newspapers, broadcasting, and the internet, the internet medium showed the most negative tone in covering water. Stories written by journalists with expertise were less than 1% whereas stories by ordinary journalists were mostly found. In conclusion, to cover public issues like water desirably, it is necessary to bring up journalists with expertise in environmental issues, to diversify news sources, and to do investigative reporting rather than reporting appealing to audience's amusement.

• Journal of the Korea Society for Simulation
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• v.17 no.4
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• pp.219-227
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• 2008

The DEVS (Discrete Event Systems Specification) formalism supports specification of discrete event models in a hierarchical modular manner. MATLAB/Simulink is widely used for modeling, simulating and analyzing continuous and discrete time systems. This paper proposes a realization of the DEVS formalism in MATLAB/ Simulink. The proposed design enables to use a great amount of mathematical packages and functions included in MATLAB /Simulink. The design is also employed as real time simulation and hybrid system simulation which is a mixture of continuous systems and discrete event systems. The paper introduces Simulink-DEVS model, in which a simulation algorithm is embedded. The model consists of a Simulink-atomic model and a Simulink-coupled model. In addition, the time advance algorithm to simulate the model is suggested. The algorithm handles the time synchronization and the accommodation of different concepts specific to continuous and discrete event models. Two experimental results are presented for a pure discrete event model and a hybrid model.