• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.64-65
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• 2003

현대 정보화 사회에서는 컴퓨터 시스템 및 통신 시스템의 결합으로 시공간을 초월하여 엄청난 양의 정보교환이 신속히 이루어지고 다양한 형태의 서비스 환경이 창출되어 사회 전반에 걸쳐 빠르게 확산됨에 따라 경제, 사회 등 전 분야에 큰 변화를 일으키고 있다. 이러한 사회는 우리생활을 보다 편리하게 만들어 주고 있지만 때로는 정보의 유출로 인한 막대한 피해를 주기도 하여서 정보보호가 매우 중요한 문제로 대두된다. (중략)

• KOREAN POULTRY JOURNAL
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• v.43 no.5
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• pp.111-115
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• 2011

정부는 지난 3월 24일 축산업을 지속 가능하고 경쟁력 있는 산업으로 개편하고 방역체계 전반을 근본적으로 개선하기 위해 관계부처 합동으로 "가축질병 방역체계 개선 및 축산업 선진화방안"을 확정 발표하였다. 최근 구제역, AI 등 가축질병이 확산되어 축산업뿐만 아니라 국민경제에 악영향을 끼침에 따라 대통령이 지난 1월 6일 긴급 관계 장관 회의를 주재하는 자리에서 "범정부적 대책을 수립하라"고 지시한데에 따라 수립된 것이다. 이후 총리실을 중심으로 범정부 TF가 구성되어 대책을 협의해 왔고, 관계부처 합동으로 발표한 자료 중 축산 부분에 대해 발췌한 내용을 본지를 통해 소개하고자 한다.

• The Journal of the Acoustical Society of Korea
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• v.34 no.2
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• pp.146-156
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• 2015

This study investigated how the location of sound absorptive materials and sound diffusers affects the acoustic performance of small auditoriums. It was conducted for a standard model established with the averaged dimension of 36 auditoriums which had opened since 2000 in Daehak-ro, Seoul. In this study, the installation area of finishing materials was calculated upon a back wall which had the smallest installation effective area of finishing materials. To analyze the changes of acoustic performance according to installation location of finishing materials, experiments were carried out using the 1/10 down scale models for 8 cases which were made by classifying the installation location of ceiling and side wall into the front, middle and rear part.The used acoustic parameters were reverberation time (RT), early decay time (EDT), clarity (C80), definition (D50) and speech transmission index (STI). In result, the index related to the amount of reverberant sound (RT, EDT) showed the great changes when evaluating it through just noticeable difference (JND), but the one related to clarity (C80, D50, STI) hardly indicated the changes. In case to obtain short reverberation time, it was most effective to control reverberation time through the side walls when installing sound absorptive and diffusive materials, and side wall front was the location which could get the shortest reverberation time.

• Management & Information Systems Review
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• v.17
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• pp.83-105
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• 2005

인터넷은 한국사회 전반에 많은 변화를 초래하였다. 인터넷이 빠르게 확산되어 2004년 말에 인터넷 이용자 3,000만 명 시대를 열었고 이동전화, 초고속 인터넷 등 새로운 정보기술이 보편적으로 활용되는 단계에 이르렀다. 그에 따라 개인 홈페이지가 커뮤니케이션의 새로운 수단으로 자리 잡았고, 이에 따른 새로운 네티즌 문화를 탄생시켰다. 사회문화적 측면에서 그동안 정보화가 창출한 가장 큰 변화는 조직사회의 변화, 교육환경의 변화, 문화생활의 변화를 들 수 있다. 인터넷이 조직사회에 미친 영향은 전통적인 연공서열식 피라미드형 조직구조가 새로운 네트워크형 조직으로 발전하였으며, 노동시장도 장소에 구애받지 않고 이동원격근무(mobile Office)로 발전하는 추세이다. 그리고 교육환경은 가상공간을 통한 다양한 교육정보 접근기회를 확대하고 있으며, 사람들의 사고방식, 생활양식, 가치관의 변화도 수반하고 있다. 반면에 인터넷 사회는 한국사회 전반의 변화와 함께 정보화의 역기능 현상도 다양하고 광범위하게 확산되고 있다. 인터넷이라는 온라인상에서 다양한 주제로 서로 만나고 정보를 교환하는 사이버 공동체(Cyber Community)는 온라인 공간에 한정되는 것이 아니라 현실공간으로 확장되어 나타나고 있으며, 인터넷 중독문제는 개인뿐만 아니라 가정과 사회에도 부정적 영향을 끼치고 있을 뿐만 아니라 안티사이트도 진정한 대안문화로 자리 잡지 못하고 인터넷의 익명성을 이용해 무차별적인 비방과 욕설이 난무한 과도기적 현상을 보이고 있다. 이제 인터넷은 한국사회의 모든 것과 깊은 관련을 맺는 매우 중요한 일부분이 된 것이다. 인터넷은 20세기 공학기술이 성취한 위대한 업적 중의 하나이다. 인터넷은 단순히 정보화 사회를 실현하는 것이 아니라 인간의 삶의 가치, 생활의 편익 등을 증대한다는 믿음 때문이다. 한편 현실은 여러 가지 역기능이 함께 나타나고 있다. '네티즌 윤리강령'까지 선포했지만, 진정한 네티즌 윤리는 강령을 선포했다고 저절로 확립되는 것이 아니다. 네티즌 각자의 실천의지가 있어야 한다. 인류가 새로운 이상향이라고 추구하는 가상사회는 윤리적인 사고와 행동으로 질서를 유지하지 못하면 인류의 밝은 미래는 보장할 길이 없다. 21세기 정보화 사회, 인터넷 사회를 맞이한 우리는 이 세상을 참으로 살기 좋은 세상으로 만들어야 할 고귀한 책무를 안고 있다. 아무리 험한 길, 어려운 과제라 할지라도 그 목표를 잃어서는 안 되며, 그 해답을 얻는 노력을 결코 게을리 해서는 안 된다.

• Water for future
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• v.26 no.3
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• pp.137-148
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• 1993

A hybrid finite difference method for the longitudinal dispersion equation was developed. The method is based on combining the Holly-Preissmann scheme with the fifth-degree Hermite interpolating polynomial and the generalized Crank-Nicholson scheme. Longitudinal dispersion of an instantaneously-loaded pollutant source was simulated by the model and other characteristics-based numerical methods. Computational results were compared with the exact solution. The present method was free from wiggles regardless of the Courant number, and exactly reproduced the location of the peak concentration. Overall accuracy of the computation increased for smaller value of the weighting factor, $\theta$ of the model. Larger values of $\theta$ overestimated the peak concentration. Smaller Courant number gave better accuracy, in general, but the sensitivity was very low, especially when the value of $\theta$ was small. From comparisons with the hybrid method using the third-degree interpolating polynomial and with split-operator methods, the present method showed the best performance in reproducing the exact solution as the advection becomes more dominant.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.5
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• pp.1083-1095
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• 2021

With the recent increase in users' dependence on the Internet and the spread of various IT devices, the influence of information security on the users' has expanded compared to the past. Therefore, it is expected to have an increased influence on information security in personal life. In addition, as the intrusion factors that threaten security continue to become more advanced and diversified (eg., fake news, cyberbullying, identity theft), the need for nurturing information security experts is increasing. Furthermore, not only corporate information security workers, but also all individuals, cannot be free from the threat of information security. Therefore, it is necessary to prepare various information security education to improve information security awareness and induce proactive information security behaviors. In this study, characteristics of domestic and foreign information security education courses are analyzed and provide a standardized framework for information security education applicable to the domestic environment.

• Journal of Korea Water Resources Association
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• v.30 no.2
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• pp.143-154
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• 1997

A numerical model for solving advection-diffusion equation is presented by splitoperator method combining the Holly-Preissmann scheme with a fifth-degree interpolating polynomial for advection operator and the explicit scheme porposed by Hobson et al. for diffusion operator. To examine the developed model, the obtained numerical solutions are compared with both the analytic solution and those from the existing models for the instantaneous source (Gaussian hill) and the continuous source (advanced front) at upstream boundary with constant velocity and diffusivity condition. For the various cases having different Courant and Peclet numbers, it is shown that the present study provides stable solutions even for Courant numbers exceeding one. The result obtained by the present study also agree well with existing analytical solutions for both cases. The proposed explicit scheme somewhat releases the conventional restriction of explicit schemes for determining the time step size and provides satisfactory results for relatively large time step size.

• The Journal of Engineering Geology
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• v.32 no.4
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• pp.547-558
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• 2022

In August 2020, a debris flow occurred in Gokseon, Jeollanam-do, that resulted in the death of five residents. In this study area, high-resolution 0.03 m topographic information was generated through photogrammetry, and the amount of soil movement/loss was measured. In addition, sensitivity analysis was performed for flow depth, flow velocity, and debris flow area with the program Flo-2D using the difference in simulation parameter that discharge and topographic information. Wth increasing debris flow input discharge, increases were seen in flow depth, flow velocity, and debris flow area, as ell as in the gap in results from high-resolution topographic information and low-resolution topographic information. Also, when high-resolution topographic information was used, the results were similar to the actual (measured) flow direction of the debris flow. Therefore, the application of high-resolution topographic information increases the accuracy of the debris flow analysis results compared with low-resolution information. Results could be further imporved in the future by considering geological information such as yield stress and viscosity.

• Journal of Korean Society of Disaster and Security
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• v.10 no.1
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• pp.85-90
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• 2017

The purpose of this study is to investigate the effect of vertical and horizontal refraction on the lower part of the power supply and control system of various facilities and machinery that use electricity, so that the power distribution system, which is an important electric facility installed in buildings and public facilities, Type earthquake resistant pads to protect the substructure and prevent short-circuiting on the upper part of the system. The GR-63-CORE (Scale 8.3 class) It is earthquake disaster prevention and disaster prevention technology that satisfies seismic performance. As a research result, it is possible to protect the electricity and communication infrastructure, which can contribute to shortening the time for recovering the electric facilities to the normal state in case of an earthquake, and preventing the fire caused by the destruction of the electricity supply facility in case of an earthquake. As a result, it is possible to minimize the spread of fire that occurs when a large-scale earthquake occurs and to minimize the damage of people and damage to property, and it can contribute to the securing of electric infrastructure that enables citizens to quickly recover to daily life even after suffering a major earthquake. In addition, the technology can be applied to ensure the seismic resistance of the equipment in the communication and computer room, and it can be applied to various fields where the facility function can be stopped due to the shaking of the earthquake base.

• Korean Journal of Environment and Ecology
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• v.30 no.5
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• pp.848-856
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• 2016

The purpose of this study is to determine the impact on settlement pattern of wintering swans by distribution of rapidly spreading lotus in Junam reservoir. When we investigated the relationship between the spreading lotus and population variation of the wintering swans in all around Nakdong-river estuary, the spreading lotus did not affect the number of swans in Junam reservoir. The occupation ratio of lotus distribution continuously increased from 13.2%(2013) to 19.0%(2014). Before we begin with the investigation, we compared two particular groups: inside of lotus community and far (>100 m) water area from the border of lotus community. At the first survey(2013.12.17), we observed 3.1 times more swan population in the inside, comparing with far water area. The third(2014.01.29.) and fourth(2014.12.03) inquiries also showed respectively 5.5 and 7.5 times higher swan population in the inside and near water area. The second observation was conducted during visitors were increased so these phenomenon was not observed. This result might be explained as the similar environmental condition of habitate for swan and lotus such as less than 1 m water depth. However, we considered that lotus and swan were not relation of conflict due to increasing both lotus community and swan population at the same time. According to the observation that inhabitation density of wintering swans is significantly high in near lotus communities area, at least spread of lotus did not negatively affect the wintering swans.