• Journal of Radiation Protection and Research
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• 제35권3호
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• pp.91-95
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• 2010

The study aimed to measure the levels of radiation protection for radiologists in medical institutions in three environmental categories (physical, administrative and social) and to establish a data base which can be used to increase awareness of environmental radiation protection in medical institutions within Korea. The study surveyed 10% of radiologists working in radiology departments in medical institutions which are supervised by the National Dose Registry overseen by the Korean Food and Drug Administration(KFDA). This study found that the level of environmental radiation protection was higher in the capital area and in larger hospitals. On the other hand, the study shows environmental radiation protection was lower in the Youngnam area and in clinics. Results from the questionnaires indicate the level of environmental radiation protection was higher when radiologists were given an individual dosimeter but lowest when the radiation protection apron quality test was conducted. Environmental radiation protection is an important factor for radiologists to conduct activities in a safe and protected environment. However, this study shows there are differences in the level of environmental radiation protection in medical institutions and location within Korea. In particular, the level of environmental radiation protection was lower in clinics, appropriate intervention strategies befitting these conditions are needed based on medical institution classification and location in order to improve the level of environmental protection.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.649-652
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• 2008

In urban area, flood risk is getting higher because of inland flood risk has grown up by changing rainfall intensity, rainfall pattern, changing land use and so on. Urban area is needed higher flood protection level to protect accumulated people, buildings and other infrastructures. However, even though former flood protection has focused on overflow from river, there is not a guide line for evaluating proper flood protection level. Thus, it is necessary to protect flood from inland flooding as well as overflow from river and need a proper method to evaluating flood protection level. This study present a method of determining flood protection elevation by using GIS tools for deciding proper flood protection level. The study result may contribute to urban flood protection measures in which inland flood risk increases.

• 한국항공우주학회지
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• 제39권10호
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• pp.946-951
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• 2011

본 논문에서는 제주 국제 공항에서 실시된 항공우주연구원의 비행 실험 데이터를 기반으로 항공기 착륙 상황을 시뮬레이션하고, Protection Level 관점에서 제주 국제 공항 GBAS 시스템의 가용성 및 성능 향상을 위한 요구조건을 분석하였다. 요구조건을 분석하기위해, CAT I, CAT II/III의 결심고도에서 항공기 착륙 상황 (기준국 정밀좌표, 항공기 착륙 속도, 기준국 및 항공기 안테나 성능지표 등)을 Protection Level 계산에 적용하였다. 이 때 귀무가설 / 대립가설 (H0 / H1) Protection Level을 한계치 (Alert Limit)와 비교 분석하여, 현재 CAT I, CAT II/III의 가용도 및 개선 방향을 도출하였다.

• 한국건축시공학회지
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• 제19권2호
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• pp.193-200
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• 2019

한반도 안보상황에서 주변국들에 의한 EMP 위협이 고조되는 상황에서 EMP 방호시설은 군의 작전수행능력을 보장할 수 있는 매우 중요한 수단이다. 이러한 EMP 방호시설은 작전을 수행하는 부대의 다양한 요소들을 종합적 고려하여 구축하여야 한다. 하지만 현 군 관의 EMP 방호기준은 80dB의 일률적인 차폐효율만을 요구하고 있다. 본 연구에서는 전문가 집단의 의견을 통해 객관적이고 통계적 방법을 사용하여 방호요구수준의 고려사항을 재선정하고자 한다. 연구방법은 델파이기법을 사용하였으며, 53명의 EMP방호 설계기준과 관련 있는 전문가들을 선정하였다. 1차 설문은 EMP 방호의 적정수준에 대하여 조사하였고, 2차 설문은 방호대책 수립시 고려요소에 대하여 분석하였다. 채택된 전문가의 의견에 대해 요인분석을 실시한 결과, EMP 방호요구수준 설정시 METT+TC 요소를 고려하여야 한다는 것을 확인하였다.

• Journal of Positioning, Navigation, and Timing
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• 제12권3호
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• pp.281-288
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• 2023

The International Maritime Organization (IMO) states that the recommended horizontal accuracy for coastal and offshore areas is 10 m, the Alert Limit (AL) is 25 m, the time to alert is 10 seconds, and the integrity risk (IR) is 10^-5 per three hours. For operations requiring high accuracy, such as tugs and pushers, icebreakers, and automated docking, the IMO dictates that a high level of positioning accuracy of less than one meter and a protection level of 0.25 meters (for automated docking) to 2.5 meters should be achieved. In this paper, we analyze a method of calculating the user-side protection level of the centimeter-level precision Global Navigation Satellite System (GNSS) that is being studied to provide augmentation information for the precision Positioning, Navigation and Timing (PNT) service. In addition, we analyze standardized integrity forms based on RTCM SC-134 to propose an integrity information form and generate a centimeter-level precise PNT service plan.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 C
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• pp.896-898
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• 1998

Recent development of the digital computer and communication technology has made the concept of the adaptive protection possible, which is to adapt the operating parameters of the protective devices to the system changes, so that the best protection function can be maintained all the time. In order to achieve the adaptive protection, it is necessary to have the way to determine whether the change of the settings is needed under the certain system change or how good the current protection level is. This paper proposed the protectability index, which is a way to evaluate the protection level of the system under arbitary conditions and the operating strategy of the adaptive protection utilizing this index. It is based on an hierachical evaluation model and the evidence combination rule of the Dempster-Shafer theory.

• Journal of Radiation Protection and Research
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• 제48권2호
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• pp.68-76
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• 2023

Background: In the process of discussion on the possibility of using radionuclide-contaminated soil and debris generated by radiation disasters, a strategy for the proper management of radiation exposure protection while considering the source of the contaminated materials is necessary. Materials and Methods: The radiological protection criteria that are likely to be applied to the source-related approach based on the International Commission on Radiological Protection recommendations and the International Atomic Energy Agency safety standards are summarized. We proposed five interpretations of radiation protection to contribute to the promotion of discussion on the possibility of using a part of low-level-radionuclide-contaminated soil and debris in the post-accident rehabilitation. Interpretations I to III are based on the idea of "using a reference level to protect the public in post-accident rehabilitation," whereas IV and V are based on the idea of "using the dose constraint to protect the public in the post-accident rehabilitation when the sources are handled in a planned activity." The former idea is subdivided into three based on the definition of the source, which is managed by the reference level, and the latter idea is divided into two depending on whether or not additional dose from using contaminated materials is deemed acceptable. Results and Discussion: To confirm the applicability of the five interpretations presented, we suggested the concrete values of protection criteria via two feasible cases. In this case study, we proposed radiation protection by the dose constraint based on the Interpretation IV and chose 1 mSv/yr for the public and 20 mSv/yr for workers dealing with radionuclide-contaminated materials. Conclusion: We concretely and systematically demonstrated how the concept of radiation protection can be applied to the process of discussion on the possibility of using radionuclide-contaminated materials within the framework of an international system of protection. This study's findings can provide necessary information to discuss the possibility of using radionuclide-contaminated materials as an alternative option for recovery and reconstruction after a radiation disaster from the viewpoint of radiation protection.

• 디지털산업정보학회논문지
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• 제5권4호
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• pp.87-97
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• 2009

Internet network routing system is used to prevent spread and distribution of malicious data traffic. This study is based on analysis of diagnostic weakness structure in the network security domain. We propose an improved integrated multi-level protection domain for in the internal route of groupware. This paper's protection domain is designed to handle the malicious data traffic in the groupware and finally leads to lighten the load of data traffic and improve network security in the groupware. Infrastructure of protection domain is transformed into five-stage blocking domain from two or three-stage blocking. Filtering and protections are executed for the entire server at the gateway level and internet traffic route ensures differentiated protection by dividing into five-stage. Five-stage multi-level network security domain's malicious data traffic protection performance is better than former one. In this paper, we use a trust evaluation metric for measuring the security domain's performance and suggested algorithm.

• 경영과정보연구
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• 제33권3호
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• pp.21-33
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• 2014

본 연구는 최근에 해외직접투자의 결정요인으로써 간주되고 있는 투자대상국의 지적재산권 보호의 영향에 관하여 실증분석 하였다. 2000부터 2008년까지 미국의 다국적기업들을 대상으로 고정효과 모형(FEM)과 시스템 GMM을 사용하여 분석한 결과, 지적재산권 보호의 변화는 미국 다국적기업으로부터의 해외직접투자를 유입에 있어서 긍정적인 영향을 미치는 반면에, 지적재산권 보호의 정도는 유의적인 영향을 제공하지 않았다. 소득수준을 기준으로 고소득국가와 저소득국가로 나누어 실시한 추가 분석결과에서 역시 지적재산권 보호의 변화만이 저소득국가에서의 미국 다국적기업의 투자에 긍정적인 영향을 미치는 것으로 나타났다. 패널자료의 특성상 오차항의 이분산성(heteroscedasticity)을 고려하여 전체 투자대상국을 상대로 FGLS와 PCSE 분석을 실시한 결과에서도 지적재산권 보호의 변화만이 해외직접투자의 유입에 긍정적인 영향을 미치고 있음을 알 수 있으며, 동일한 방법으로 고소득국가와 저소득국가로 나누어 추가분석을 실시한 결과에서는, 저소득국가에서만 미국 다국적기업의 해외직접투자 유입에 유의적으로 긍정적인 영향을 제공하고 있음을 보여주었다. 이러한 결과는 투자대상국의 지적재산권 보호의 수준보다는 변화가 해외직접투자의 유입에 영향을 제공하는 것으로써, 특히 저소득국가가 미국 다국적 기업의 해외직접투자를 유입하기 위하여 지적재산권 보호의 변화에 대한 중요성을 시사한다.