• Mass Spectrometry Letters
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• 제1권1호
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• pp.17-20
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• 2010

As background significantly affects measurement accuracy and a detection limit in determination of the trace amounts of uranium, it is necessary to minimize the impurities in the filaments used for thermal ionization mass spectrometry (TIMS). We have varied the degassing condition such as the heating currents and duration times to reduce the backgrounds from the filaments prepared with zone-refined rhenium tape. The most efficient degassing condition of the heating current and the duration time was determined as 3.5 A and 60 min, respectively. The TIMS measurement combined with the isotope dilution mass spectrometry (IDMS) technique showed that the uranium backgrounds were determined to be in a few fg level from blank rhenium filaments. The background minimized filaments were utilized to measure the uranium isotope ratios of a U030 (NIST) standard sample. The excellent agreement of the measurement with the certified isotope ratios showed that the degassing procedure optimized in this study efficiently reduced the impurity signals of uranium from blank rhenium filaments to a negligible level.

• 인터넷정보학회논문지
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• 제7권1호
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• pp.31-38
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• 2006

정보화 발전으로 정보통신 시스템에 대한 의존도가 높아지고, 이에 대한 위협, 취약성, 위험이 증가하고, 조직의 정보노출 및 보안침해 사고가 증가하고 있는 추세이다. 이러한 정보통신시스템에 대한 위협, 취약성, 위험을 분석하고 제거하기 위한 보안위험분석의 중요성이 부각되고 있다. 위험분석도구는 조직에 내재한 위험을 식별하여 보안침해 사고 발생을 사전에 예방하기 위한 도구로서 주요 정보시스템을 분석 평가하고, 위협, 취약성, 보안대책을 제시하여 조직의 위험 수준을 감소하는 데 도움을 준다. 본 논문은 국제공통평가기준 CC 스키마를 도입하여 정형화된 위험분석 프로세스를 정의하고, 정보보안 관리자가 쉽게 위험분석을 적용 할 수 있도록 보안위험분석 도구를 제안한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 F
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• pp.1886-1891
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• 1998

Traction battery chargers are an integral part of the required charging infrastructure. EV charging systems are continuing to improve in design. The newer types are affecting power quality to a much lesser extent. High efficiency battery chargers are being designed and produced which form little or no harmonic distortion. In addition chargers are becoming smaller and lighter. This is due mainly to the fact that there are improvements in the power electronics industry, especially with respected to IGBTs. Lower costs are achieved by the reduction in price of the IGBTs, standard magnetic material and small cores for inductors and transformers. But electric vehicles occupy a relatively small market niche at present. Therefore with already existing power supply networks, establishment of EV infrastructure can safeguard the service value of present vehicle as well as ensure the ability to charge a significant number of such vehicle. In this paper, we surveyed the update charging technologies according to the conductive charging, inductive charging and fast charging. Then we suggested cost-optimized charging infrastructure in consideration of the economical, political and technical standpoint.

• Nuclear Engineering and Technology
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• 제38권4호
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• pp.353-358
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• 2006

Alpha track analysis for the determination of the trace amount of alpha emitting nuclides in a very small particle was performed as an efficient and powerful technique during safeguard inspection. Metal particles with well-defined spherical shape, size and isotopic compositions as a reference material were used to correlate the number of tracks or track diameter with an isotopic composition eventually to identify the uranium enrichment in the environmental swipe samples. Slopes in the number of tracks versus the exposure time curve provide a simple insight into the uranium enrichment of an unknown particle. Low enriched uranium metal particles result in slopes still steeper than the depleted or natural uranium metal particles. In addition, a linear relationship between track diameter and particle size Is thought to be a useful first stage analytical tool as an efficient and convenient inspection guide. The significance of the simple linear model was also judged using the usual statistical tests.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.154-155
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• 2013

본 논문에서는 무선 센서네트워크망을 이용한 헬스케어 시스템에서의 사용자 인증을 위한 프레임에서의 보안 문제를 해석하였다. 이러한 메디컬 센서 데이타는 환자의 몸으로 부터 신호를 받아 의사 등과 스태프에게 정보를 전달한다. 개개인의 정보가 취약성을 가지고 있으며, 비 인가된 제 3자에게 노출되고 있다. 따라서, 본 논문에서는 두 가지의 요소를 가진 사용자 인증 프로토콜을 설계할 때 문제시 되는 방법을 분석하였다. 또한 이러한 프로토콜에서 발생 가능한 위협 요소를 정의하였다.

• 지역사회간호학회지
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• 제28권2호
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• pp.182-195
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• 2017

Purpose: This study explores school nurses' emergency care experiences and their needs for systemic institutional support. Methods: Data were collected in 2016 from the interviews with five focus groups comprising thirty school nurses. Qualitative content analysis was then performed using the collected data. Results: The study found that school nurses were vulnerable to over-reaction in uncertain situations as the school's sole health service provider. The study's findings are divided into ten categories. 1) Major obstacles to overcome as the sole health service provider, 2) Assessing an uncertain situation and making appropriate decisions, 3) Providing limited first aid while maintaining control over the situation, 4) Referring or transferring a student to a hospital that creates tensions and raises cost, 5) Becoming an advocate for information disclosure and treatment, 6) Ensuring follow-up actions and proper transfer of responsibility, 7) Making preparations for future emergency, 8) Responding to conflicts arising from over-reaction as a safeguard and professional expertise, 9) Need for the development of standardized manual for school emergency care, 10) Need for practical case-based training. Conclusion: The findings of this study should contribute to the development of the programs aimed at improving school emergency care and the professional competence of school nurse.

• 한국정보보호학회:학술대회논문집
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• 한국정보보호학회 1994년도 종합학술발표회논문집
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• pp.288-302
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• 1994

정보시스템에 대한 위험분석 (risk analysis)은 정보시스템의 보안상태를 분석 및 평가하는 것으로 정보시스템의 보안상 취약부분을 보완하기 위한 보안대책을 수립하는데 안내자 역할을 하게 된다. 정보시스템의 보안대책 및 위험관리는 위험분석을 기초로 하므로 정보시스템은 합리적이고 정확한 위험분석을 수행해야 할 것이다. 위험분석기법은 수학적 기법과 다이어그램 기법이 있다. 수학적 접근방법 (mathematical approach)은 실제상황을 적절히 표현하기 어려우며 증명하기가 어렵다. 다이어그램기법 (diagraming techniques)은 이러한 수학적 접근방식의 한계를 극복함에 있어 휠씬 더 유용하다. 본 논문에서는 외국의 위험분석 기법(INFO SEC [4], SRAG [5], FIPS65 [6], JRAM [7]) 을 분석하였다.

• 한국학교ㆍ지역보건교육학회지
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• 제2권1호
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• pp.19-30
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• 2001

Korea has experiencing outbreaks of food borne illnesses since school feeding programs had been introduced to students. In order to prevent food borne diseases, preventive measures applicable to Korean school system were reviewed. The conclusions are summarized as follows; 1. Raw materials should be purchased through reliable sources in order to ensure the quality of food stuffs in the aspect of food safety and hygiene. 2. The potential causes of food borne illnesses should be carefully identified and control system should be established in order to monitor critical points. 3. Temperature of refrigeration should be monitored and controled continuously in order to safeguard the quality of foods. 4. National and local governments have to provide adequate equipment and utensils to the food establishments of school systems, and public health authorities have to make evaluation of the facilities periodically. The food handlers should be trained in safe food handling and the ways how to prevent food borne illnesses.

• 한국유통학회지:유통연구
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• 제1권1호
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• pp.239-258
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• 1996

This study deals with the measurement of relational norms, a safeguard for sustained exchange relationshipsim marketing channel systems. Here, the relational norm items are hypothesized to have a second-order factor model, in which mine observed items originate from the three first-order factors and the first order factors in turn originate from a second-order factor. The three first order construe comprising a higher order norm are mutuality(equity in the distribution of benefits and burdens over the course of the exchange on a long term basis), flexibility(expectation of friendly adaption for possible circumstance changes), and solidarity (the degree to which the preservation of the unique and continuing relationship is internalized by the exchange partners as being important in and of itself). 113 research questionnaires are obtained from four industries such as construction, telecommunication, iron, and electric ＆ electronic industries, Reliability and nomological. discriminant validity are tested, and in using the confirmatory factor analysis of Lisrel 7.16, and the chi-square difference test it is tested which has a better satisfactory fit to the data, the first-order model or the second-order one. The results of this study indicates that relational norms have a second order construct. In the electric and electronic industry the model as a while has a satisfactory fit to the data and the relevant first- and second-order factor loading to the mutuality is not significant. Same Results are happened to the flexibility in the telecommunication industry and to the mutuality and flexibility in the inn industry. In sum, the model lends support to our construct, but it is difficult to apply the measurement model to all kinds of industries.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2012년도 제38회 춘계학술대회논문집
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• pp.520-526
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• 2012

화포에서 탄저 압력이 포미 압력 보다 높은 역압력 구배가 발생하면 화포에 잠재적인 충격이 증가하는 것으로 알려져 있다. 화포의 안전성을 확보하기 위해 발사 과정에서 이 역압력 구배를 최소화시키는 설계가 필요하다. 이에 수치 해석을 통해 점화제 연소율이 역압력 구배에 미치는 영향을 조사하였다. 점화제 연소율 상수가 증가할수록 역압력 구배는 증가하였고, 특정 연소율 계수에서 급격한 압력변동이 발생하였다.