• Journal of radiological science and technology
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• v.40 no.2
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• pp.317-322
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• 2017

High-tech medical equipment has increased the utilization of radiation in the medical field. As a result, research on radiation protection using natural materials has become an important social issue. Selenium is a natural substance that is highly expressed in prostate known that an essential role in prostate cells. Selenium was orally administered to Rat and irradiated with 10 Gy of radiation. Then, the prostate tissue w as used as a target organ for 1 day, 7 days and 21 days to investigate the radiation protection effect of selenium through changes of blood components, Superoxide Dismutase and histological changes. As a result, there was a significant protective effect of hematopoietic immune system(hemoglobin concentration, neutrophil, platelet) in the group irradiated with selenium(p<0.05). the observation of tissue changes selenium is an effective component to increase Superoxide Dismutase activity, and it was confirmed that it has an effect of inhibiting the expression of hypertrophy of prostate by irradiation. Therefore, it is considered that selenium can be utilized as a radioprotective agent by inducing prevention of prostate-related diseases.

• Progress in Medical Physics
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• v.26 no.2
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• pp.93-98
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• 2015

The purpose of this study is to see the usefulness of lead apron for critical organs near the breast under examining. For clinical experiment, 30 female volunteers who agreed to their participation in the experiments, were chosen and divided into two groups, 15 in group A and 15 in group B respectively. group A is to see whether each side of breast under mammography affects to other side glandular on the critical organs is same, because it is not allowed to scan the both breast for same person or to scan repeatedly. Group B is to see the effectiveness of lead apron during the mammography of right breast. Glass dosimeters were placed on the thyroid, the contralateral breast, and lower abdomen where near the breast during examining. The average glandular doses on the surface in mammography of the thyroid gland, the contralateral breast, the lower abdomen were 0.0692 mGy, 0.6790 mGy, and 0.0122 mGy, respectively, which was an extremely low level of glandular dose. In group B, as to the thyroid gland, average dose was decreased from 0.0922 mGy to 0.0158 mGy. The average dose of contralateral breast was decreased from 0.8575 mGy to 0.0286 mGy. The average doses of lower abdomen was decrease 0.0150 mGy to 0.0173 mGy. As to the lower abdomen, dose decreased from 0.0150 mGy before the use of an apron down to 0.0173 mGy after the use. As p-value was under 0.05, statistically significant difference was observed between the two groups. Wearing an apron can have the protective effects on the thyroid gland up to 20 times lower than not wearing one. Besides, it is also necessary to protect the other breast during the examination by wearing one.

• The Journal of the Korea Contents Association
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• v.21 no.5
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• pp.234-246
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• 2021

The purpose of this study is to develop the main subjects of the job-based curriculum by deriving the job analysis results of general security job workers in the physical protection field responsible for responding to threats to nuclear materials and nuclear facilities. In the job analysis stage, FGI was conducted on 7 content experts to derive 8 duties and 55 tasks. In addition, knowledge and skills were drawn for each task. In the analysis of educational needs, surveys were conducted for workers in general security jobs to derive the top 25 educational priorities through t-test and Borich needs assess model. At the stage of selecting core tasks and organizing required/optional contents, 42 tasks, both above average or at least one of them, were derived as core tasks based on the result of evaluation of importance and difficulty ratings of 55 tasks through a questionaire. In addition, tasks applied to the top 25 rankings derived from Borich needs assess model were applied as the required contents when designing courses, and tasks which applied only one of them were selected as optional contents. At the stage of required/optional modules and educational contents, four required modules and five optional modules were derived by drifting similar tasks between the required and optional contents. Based on the above results, the study suggested academic and practical implications and future suggestions.

• Journal of Digital Convergence
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• v.18 no.11
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• pp.247-257
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• 2020

The Purpose of this study is to present effective Anti-Drone systems to protect national important facilities against drones that are illegally used by crime groups and terrorists with malicious intents. In order to accomplish the purpose of the study, technical and policy reports regarding Anti-Drone systems, open documents from manufacturers and various research papers are reviewed, and in-depth interviews with experts were conducted. Studies have shown that it is effective to overlay and mix different detection systems so that they can improve detection rates by supplementing each other's advantages and disadvantages, and that the means of incapacitation need to acquire flexibility by using both soft-kill and hard-kill methods in accordance with operational environment for the effective usage. In other words, the establishment of an illegal drone pre-management system, mixed and overlapping detection assets, determining appropriate countermeasures, and multiple distribution of means of incapacitation. The establishment of a protection system for important national facilities through the operation of overlapping and complex anti-drone systems is the most urgent task.

• Fire Science and Engineering
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• v.33 no.4
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• pp.77-82
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• 2019

Fire extinguishing systems are essential equipment in all indoor facilities to address unexpected fire scenarios, and appropriate fire extinguishing agent should be used depending on the place and object to protect. Among these, gaseous fire-extinguishing systems are used to protect electronic equipment. Therefore, inert gases that do not undergo chemical reactions are used mainly in those systems. On the other hand, recently, owing to the high integration of electronic equipment, there are some cases, in which large noise generated from gaseous systems damage the electronic equipment. In this study, numerical analysis of the discharge noise with various nozzle contraction angles was carried out to improve the gas fire extinguishing system. Numerical analysis was carried out using ANSYS FLUENT ver 18.1. The causes of the noise were elucidated using the swirl distribution. The noise level of the modified model was reduced by approximately 6 dB compared to the reference model, which is similar to the result of a previous study, confirming the validity of the method.

• The Journal of the Convergence on Culture Technology
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• v.9 no.6
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• pp.789-793
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• 2023

Evalution of counter drone systems is conducted in order to designate plausible countermeasues against possible drone threats, assess the level of safety of national major facilities and derive complementary measures for detected weakness. Recently drone threats by North Korea have heavily impacted ROK(Republic of Korea) people and it has been stronly stressed to build efficient counter drone system for make the society protected and secured against drone threats. The researchers has conducted field investigations for some of national major facilites. There is, however, no standardized evaluation checklist, so we have proposed an evaluation checklist for counter drone systems though thinking process of RMA(Revolution in Military Affairs). This paper is to introduce the evaluation checklist for properly diagnosing each counter drone system.

• Nuclear industry
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• v.16 no.8 s.162
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• pp.38-44
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• 1996

과학기술처는 지난 7월 기존의 $\lrcorner$원자력 관계 보고 규정$\lrcorner$을 첨삭$\cdot$보완하여 $\ulcorner$원자력 시설의 사고$\cdot$고장 발생시 보고에 관한 규정$\lrcorner$을 새로이 제정했다. 이는 그동안 원자력법령에 의하여 원자력 관계 사업자가 보고해야 할 사항이 원자력법, 원자력발전소 운영기술지침서, 방사선 비상계획서, 계량관리 및 방호규정 등에 산재되어 있어, 사업자나 규제기관 모두 혼란이 있어온 점을 해결한 것으로, 보고 대상과 보고 방법 등을 세분화하였으며, 또한 사업자에게 불합리하게 적용되는 일부 사항들을 발굴$\cdot$정리하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.340-342
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• 2004

인공위성과 원자력발전소와 같은 안전필수시스템의 경우, 각 작업이 주기 안에 완료되어야 하는 실시간적 특성을 가진다. 시스템이 이와 같은 요구사항을 만족하는가를 판단하기 위해서는 프로그램의 최장수행시간을 분석하는 것이 필수적이다 본 논문에서는 프로그램을 직접 실행하지 않고 최장수행시간을 분석하기 위해 구현한 Time bounder 도구를 소개하며, 다목적실용위성 2호에 탑재되는 프로그램을 대상으로 수행한 실험 결과를 분석한다.

• 월간 기계설비
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• no.9 s.218
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• pp.68-69
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• 2008

도시가스시설 검사 처리 세부지침이 개선되었다. 개정된 주요 내용은 $\Delta$내압 기밀시험 실시방법 개선 $\Delta$전기방식 생략 $\Delta$사용자공급관 입상관 밸브 설치위치 개선 $\Delta$용접 및 비파괴시험 공정 입회범위 개선 $\Delta$방호구조물 설치기준 제정 $\Delta$사용자공급관 계통도 제출 $\Delta$완성검사 필증현장 발급대상 추가 등이다. 기타 자세한 내용은 대한설비건설협회 홈페이지(http://www.kmcca.or.kr) 공개자료실에 게재되어 있다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.207-210
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• 2010

원자력발전소 화재방호 규정이 제정되기 이전에 설계되어 방화벽 관통부 내화성능 인증자료가 미흡하였던 국내 일부 가동원전들은 최근 성능인증이 완료되었거나 진행 중이다. 성능인증이 완료된 방화벽 관통부는 발전소 운영기간 동안 요구성능이 유지되도록 적합한 관리방안이 필요하다. 본 논문에서는 성능인증이 완료된 가동원전을 대상으로 방화벽 관통부 관리현황의 적합성을 평가하고 관리방법 및 절차를 향상시키기 위한 향후 과제를 제안하였다.