• 지역사회간호학회지
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• 제28권3호
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• pp.271-279
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• 2017

Purpose: Non-Suicidal Self-Injury (NSSI), a highly prevalent behavior in adolescents, refers to the direct destruction of one's body tissue without suicidal intent. To date, the prevalence of adolescent self-injury in South Korea and its associated factors remain unknown. This study aims to determine the prevalence of self-injury in Korean adolescents as well as its associated factors. Methods: We assessed 717 middle school students by means of an anonymous self-report survey. Information about demographic characteristics, lifestyle, anxiety and depression, self-esteem, and parenting behavior was obtained. Data were analyzed using $x^2$ test, t-test and multiple logistic regression. Results: NSSI was reported by 8.8% of respondents. Univariate analyses showed associations of exposure to alcohol use, anxiety, depression, self-esteem, and parenting methods with self-injury. In multiple analyses, alcohol use, anxiety, and parental abuse were associated with lifetime self-injury. Conclusion: The rate of NSSI in the South Korea was found to be lower than those of other countries. As our study suggests that alcohol use, anxiety, and parental abuse are associated with lifetime self-injury, health care providers at school should take these factors into account when developing prevention and intervention programs for adolescents.

• 한국방재학회 논문집
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• 제11권2호
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• pp.67-73
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• 2011

본 연구의 목적은 공기 단축과 초기 공사비를 절감하기 위해 PC 긴장재를 사용하지 않고, 슬리브와 일반 철근만으로 구성된 경제적이면서 시공성이 우수한 프리캐스트 교각 공법 개발에 있다. 이를 위해 본 연구에서는 신형식 철근이음 장치인 그라우팅형(形) 슬리브(Splice sleeve, 이하 슬리브)를 제안하고 최적의 슬리브를 개발하기 위하여 슬리브 길이, 철근직경, 양생방법 등을 변수로 하여 유한요소해석 및 인장실험을 수행하였다. 슬리브의 유한요소해석을 통하여 최적의 형상을 도출하였으며, 인장 성능 검토 결과, 철근의 인발에 의한 파괴는 발생하지 않았으며, 철근의 인장 파괴 혹은 슬리브의 기계적 결함에 의한 볼트 파단만이 관찰되었다. 제안된 슬리브는 우수한 인장성능을 갖고 있음을 확인하였으며 프리캐스트 교각에 무리 없이 적용할 수 있음을 검증하였다.

• 한국방사선학회논문지
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• 제16권4호
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• pp.381-386
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• 2022

비파괴검사(NDT; Non-Destruction Test)는 제품의 기능을 손상시키거나 물리적으로 파괴시키지 않고 내부의 결함을 검사하는 방법이다. 이러한 방사선투과검사는 고에너지의 방사선을 사용하기 때문에 방사선작업종사자들의 방사선피폭을 방지하는 것은 매우 중요하다. 이에 본 연구는 PbI₂에 Gd₂O₂S:Tb를 결합하여 기존 PbI₂보다 방사선 검출성능을 더욱 향상시켜 방사선투과검사에서 선원누출 등의 사고를 즉각적으로 감지할 수 있는 새로운 구조의 방사선 센서를 제시하였다. 평가는 FLUKA 전산 모사를 통하여 감마선원에서 Gd₂O₂S:Tb 결합 전후의 변환 효율을 분석하였다. Gd₂O₂S:Tb가 결합된 PbI₂는 방사선 검출성능이 1.22배에서 3.22배까지 더 높은 것으로 나타났다. 이러한 결과로부터 본 연구에서 제시된 센서는 방사선투과검사 선원 감지용 방사선 센서로 적용 가능할 것으로 분석되었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.373-378
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• 2000

The objective of this study was to investigate the influence the influence of theoretical void ratio(T.V.R), grading of aggregate and curing method on the strength and water permeability of porous concrete, and the reduction proportion of water permeability by these factors. The results of the study showed that its strength and water permeability were greatly depended on the T.V.R and grading of aggregate, but didn't on the curing method. And, when the T.V.R and grading of aggregate were increased, the reduction proportion of water permeability was small. As the relation ship between its physical properties and non-destruction test values was very high, its use for the estimation of the physical properties will be useful.

• 대한안전경영과학회지
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• 제16권2호
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• pp.43-52
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• 2014

In weapon systems development, live fire tests have been frequently adopted to evaluate the performance of the systems under development. Therefore, it is necessary to ensure safety in the test ranges where the live fire tests can cause serious hazards. During the tests, a special care must be taken to protect the test and evaluation (T&E) personnel and also test assets from potential danger and hazards. Thus, the development and management of the range safety process is quite important in the tests of guided missiles and artillery considering the explosive power of the destruction. Note also that with a newly evolving era of weapon systems such as laser, EMP and non-lethal weapons, the test procedure for such systems is very complex. Therefore, keeping the safety level in the test ranges is getting more difficult due to the increased unpredictability for unknown hazards. The objective of this paper is to study on how to enhance the safety in the test ranges. To do so, an approach is proposed based on model-based systems engineering (MBSE). Specifically, a functional architecture is derived utilizing the MBSE method for the design of the range safety process under the condition that the derived architecture must satisfy both the complex test situation and the safety requirements. The architecture developed in the paper has also been investigated by simulation using a computer-aided systems engineering tool. The systematic application of this study in weapon live tests is expected to reduce unexpected hazards and test design time. Our approach is intended to be a trial to get closer to the recent theme in T&E community, "Testing at the speed of stakeholder's need and rapid requirement for rapid acquisition."

• Structural Engineering and Mechanics
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• 제26권5호
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• pp.499-516
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• 2007

An experimental method denoted as Impulse Method is proposed as a cost-effective non-destructive technique for the on-site evaluation of concrete elastic modulus in existing structures: on the basis of Hertz's quasi-static theory of elastic impact and with the aid of a simple portable testing equipment, it makes it possible to collect series of local measurements of the elastic modulus in an easy way and in a very short time. A Hypothesis Testing procedure is developed in order to provide a statistical tool for processing the data collected by means of the Impulse Method and assessing the possible occurrence of significant variations in the elastic modulus without exceeding some prescribed error probabilities. It is based on a particular formulation of the renowned sequential probability ratio test and reveals to be optimal with respect to the error probabilities and the required number of observations, thus further improving the time-effectiveness of the Impulse Method. The results of an experimental investigation on different types of plain concrete prove the validity of the Impulse Method in estimating the unknown value of the elastic modulus and attest the effectiveness of the proposed Hypothesis Testing procedure in identifying significant variations in the elastic modulus.

• 한국신뢰성학회지:신뢰성응용연구
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• 제5권2호
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• pp.241-259
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• 2005

The environmental problem is a main subject of the 21C and an environment destruction phenomenon by various kinds of environmental materials is reaching serious level. Nations to be classified as the environmental developed country, are born again environmental rich country. And they earn a large income by trade Every kind environmental resource in an international commercial transaction. Especially, the study that a reliability assessment method to prevent to reliability problem to be happened when the solder lead(lead-free solder), non-cd component, non-bromide component(without the polybrominated biphenyls(PBB) and polybrominated diphenyl ethers(PBDE))and hexavalent chromium(Cr VI) clearance component and mercury-free applied to electronic equipment is progressed. As the result of the study for applying of a reliability assessment technique of lead-free solder that recognized the most of urgent problem at the company, combination accelerated life test could taken by adding and appling the part of a humidity acceleration part to Eyring Model which is proposed by R.E.Thomas. The reliability assessment methods study of PWB clean environmental materials is expected to respond to a reliability elevation and environmental material regulation policy spreading all over the world by beginning form Europe.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 춘계학술대회 논문집
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• pp.29-29
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• 2010

Surface contamination and leakage current have caused operating problems. A flashover in a substation may result in destruction of an insulator or many others electrical equipment. Engineering plastics have good characteristic (light weight, good productivity and little of void) as compare with epoxy or porcelain insulators. Outdoor insulator must have resistance to contamination. However, it isn't suited to outdoor insulator because it is not hydrophobic. RTV(Room temperature vulcanizing) has a good property of hydrophobic and micro-filler. nano-filler have characteristics of obstructing exothermic reaction. In order to reduce the incidence of insulator flashover and damage, the silicon rubber contained with micro, nano-filler coating on surface of engineering plastics. In this paper, it compares tracking resistance, leakage current of the engineering plastic coated RTV with that of non-coated engineering plastic. And filled-composites performed much better than non-filled composites.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2005년도 학술발표대회 논문집
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• pp.393-404
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• 2005

The environmental problem is a main subject of the 21C and an environment destruction phenomenon by various kinds of environmental materials is reaching serious level. Nations to be classified as the environmental developed country, are born again environmental rich country. And they earn a large income by trade Every kind environmental resource in an international commercial transaction. Especially, the study that a reliability assessment method to prevent to reliability problem to be happened when the solder lead(lead-free solder), non-cd component, non-bromide component(without the polybrominated biphenyls(PBB) and polybrominated diphenyl ethers(PBDE))and hexavalent chromium(Cr VI) clearance component and mercury-free applied to electronic equipment is progressed. As the result of the study for applying of a reliability assessment technique of lead-free solder that recognized the most of urgent problem at the company, combination accelerated life test could taken by adding and appling the part of a humidity acceleration part to Eyring Model which is proposed by R.E.Thomas. The reliability assessment methods study of PWB clean environmental materials is expected to respond to a reliability elevation and environmental material regulation policy spreading all over the world by beginning form Europe.

• 복식
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• 제46권
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• pp.187-207
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• 1999

The fashion advertisement is communication method between clothing and consumer. The development of mass communication accelerated that In modern society Post-modernism advertisement is a specialized and separated from so it confuses the consumers who are used in traditional AD. The peculiarities (non-form, destruction of description, compound of genre, mixing of reality and fiction) are more reflected in fashion advertisement. The sample consisted of 425 mail and female and the results were analyzed using frequency and percentage calculation Close tabs T-Test Oneway Anova Factor analysis Chi-square Test, Regression, Correlation Analysis. The result of this study were as follows: The post-modernism fashion ad is the separated and reflected from for young age's favorite. By the factor analysis of consumer response in each 5 emotional factors proved to be valid ones(fine, negative, sexual, stimulative, constructive aspects.) The fine and negative aspects of the factors are very concerned with the consumer's favorite attitude of fashion ad. There is no significant difference in age job but sex has a significant difference. In according to the method of the ad expression consumer's acceptance is difference in sex. There were no significant concern with excess effects and purchase intend in fashion advertisement.