• Journal of the korean veterinary medical association
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• v.49 no.4
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• pp.207-209
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• 2013

구제역은 동물전염병 중 가장 중요한 질병 중 하나로 쉽게 전파되어 국경을 초월하여 발생할 수 있다. 우리나라 주변지역은 일본을 제외하고 구제역 상재국으로 둘러싸여 있다. 주변국가가 구제역 청정화가 되지 않는 한 발생위험을 피해갈 수 없다. 중국은 우리나라와 인접국가로 구제역에 있어서 방역적으로 매우 중요한 상재국 중 하나이다. 따라서 중국의 구제역 발생 역사, 최근 발생상황 및 향후 구제역 근절계획에 대해서 알아보고 우리가 대처해야 할 바를 고찰해보고자 하였다.

• KOREAN POULTRY JOURNAL
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• v.38 no.3 s.437
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• pp.79-82
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• 2006

추운 겨울이 지나고 서서히 봄이 오는 소리가 들리는 듯 싶다. 지난 겨울은 여러 가지로 많은 어려움이 있었던 시기였다. 작년 말에 불거진 조류인플루엔자의 전세계적인 전파 위험에 따라서 양계 산물 소비가 급락하여 많은 어려움을 겪었고, 이러한 분위기가 좀 반전되었나 싶었더니 엄청난 폭설이 전라도 지방과 충청도 일부지방에 쏟아져 계사가 반파되거나 완전히 파손되는 농장이 속출하였다. 이처럼 유난히 길게 느껴졌던 겨울이 지나가고 이제는 봄이 다가오고 있다. 모든 어려움이 겨울과 함께 가버리면 좋으련만, 이 봄철에도 항상 양계장을 괴롭히는 질병들의 발생이 우려되고 있다. 우리나라에서 항상 봄철이면 육계의 입추가 증가함과 동시에 늘어나는 뉴캣슬병 발병 및 여러가지 호흡기 질병 중 경제적인 피해가 우려가 되는 질병 위주로 예방 대책에 대하여 알아보았다.

• Review of KIISC
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• v.32 no.5
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• pp.35-43
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• 2022

혁신적인 소프트웨어 개발을 위해, 소프트웨어 개발 환경에서 오픈소스 소프트웨어(OSS)를 활용하는 것은 하나의 개발 트렌드로 자리매김했다. 이러한 이점에도 불구하고, 적절한 관리가 이루어지지 않는 OSS 재사용은 취약점의 전파 문제나, 공급망 공격과 같은 위험한 보안 위협을 초래한다. 본 고에서는 OSS 재사용으로 인해 야기되는 다양한 보안 위협을 해결하기 위한 최근 연구들의 동향을 소개하고, 이런 연구들에 기반하여 제작된, OSS 보안성 향상을 위한 기술들을 소개한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.413-419
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• 2011

Diagnosis X-ray equipment localized at 1950's but it is developed suddenly at 1960's with demand together. Manufacture of Diagnostic X-ray equipment is controled by the KS regulation and the Ministry of Health and Welfare because of hazardous element etc. exposure by radiation. Most of diagnostic X-ray equipment ware single phase and three phase full-wave rectification but from 1980's it transforms it was exchanged in inverter type X-ray equipment. Inverter type X-ray equipment produces approximately 50~80% more average photon intensity then single phase full-wave rectification and the accuracy is high. But from a clinic it dose not use because expensive therefor the efficiency improvement of single phase full-wave rectification is necessary. We produced single phase full-wave rectification X-ray equipment control unit, high tension transformer, filament heating transformer, rectification circuit, high tension cable and others and evaluated efficiency, in result which is excellent compare with Rule of Safety Management and KS regulation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.6
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• pp.1289-1295
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• 2015

Electromagnetic wave signals radiated from an antenna are reflected by targets and received through the same antenna. These received signals show different characteristics according to various target materials having different dielectric constants. Therefore, target characteristics can be recognized if we can utilize these return signals efficiently. this method can be applied for discrimination and classification of hazardous materials. In this paper, utilizing these experimentally obtained signals, correlation characteristics are obtained and analyzed for classification and discrimination purposes. Although the correlation method requires the storage of reference signals, it shows very promising results. this correlation method can be applied for classification and discrimination of hazardous materials.

• Journal of Korean Society of Disaster and Security
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• v.13 no.3
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• pp.45-58
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• 2020

Due to a high portion of mountainous terrains in Korea, debris flow and its disasters have been increased. In addition, recently localized flash-floods caused by climate change should add frequencies and potential risks. Grasping and understanding the behaviors of debris flow would allow us to prevent the consequent disasters caused by its occurrence. In this study, we developed a number of cases by changing the bottom slopes and their curvatures and investigated their effects on potential damage caused by the debris flow using FLO-2D. As simulating each bed slopes we analyzed for velocity, depth, impact, reach distance, and reach shape. As a result the lower the average slope, the greater the influence of its curvature and the numerical results were analyzed with showed a well-marked difference in impact stress and flow velocity. The result from this study could be referred for protecting from the debris flows when design countermeasure structures in mountainous regions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.11
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• pp.1011-1022
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• 2014

Currently, the wireless network environment of air node is constructed mainly of ground relay station. However, as the Korean Peninsula is composed of 70% mountainous region, there are multiple shadow zones. This is calling for effective measures to prevent aircraft from losing communication link during low-mid altitude missions. In this article we propose the utilization of Bezier Curve for estimation of aircraft flight path and control method for entering shadow zone. This method successfully estimated aircraft track, and analyzed the existence, disseminated the warning, and took measures to avoid the shadow zone before entering. This article, suggested after simulated experiments, proves that the method enables seamless communication during air operations.

• Journal of Korea Multimedia Society
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• v.16 no.3
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• pp.330-335
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• 2013

It is expected that the vehicle safety systems using vehicle-to-vehicle communication can reduce the possibility of vehicle collision and prevent the chain crash by promptly delivering the status of neighboring vehicles. Many IEEE 802.11 DCF based Flooding schemes have been proposed, but they may generally expose the problems that the chances of a chain-collision reaction are sharply increased as the vehicle density has increased. Therefore, this paper proposes the chain-collision prevention scheme using a broadcasting-based adaptive report. The proposed method can adaptively allocate the preoccupancy right based on a quantitative priority order and then promptly deliver the warning messages in neighboring areas. Moreover, it is shown from simulation that the proposed scheme provides the performance gains over the existing Flooding based scheme.

• Journal of Advanced Navigation Technology
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• v.8 no.2
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• pp.98-104
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• 2004

When a straight-in landing from an instrument approach using ILS or VOR/DME is not possible or desirable because of topographical reason or bad weather, a circling approach maneuver is initiated by the pilot to align the aircraft with a runway for landing. Visual contact with the runway is necessary while conducting a circle to land maneuver. This research is to develop a new warning system based on a convention marker system which alerts pilots to watch out for exceeding the circling approach area. The airborne system also uses the same receiver unit without any new installations. The objective of this research is to design and develop a Yagi antenna in a special form. The research includes computer simulations to determine the size of antenna radiation pattern and to compute an expected flight path in case of alarm to validate effectiveness of the system.

• Pediatric Infection and Vaccine
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• v.28 no.2
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• pp.57-65
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• 2021

School closures during the coronavirus disease 2019 (COVID-19) pandemic have been outlined in studies from different disciplines, including economics, sociology, mathematical modeling, epidemiology, and public health. In this review, we discuss the implications of school closures in the context of the current COVID-19 pandemic. Modeling studies of the effects of school closures, largely derived from the pandemic influenza model, on severe acute respiratory syndrome coronavirus 2 produced conflicting results. Earlier studies assessed the risk of school reopening by modeling transmission across schools and communities; however, it remains unclear whether the risk is due to increased transmission in adults or children. The empirical findings of the impact of school closures on COVID-19 outbreaks suggest no clear effect, likely because of heterogeneity in community infection pressure, differences in school closure strategies, or the use of multiple interventions. The benefits of school closings are unclear and not readily quantifiable; however, they must be weighed against the potential high social costs, which can also negatively affect the health of this generation.