• 한국군사과학기술학회지
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• 제19권3호
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• pp.281-287
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• 2016

The purpose of this study is to analyze the vibration characteristics and develop a mounting which can improve the strength safety factor to replace the high failure rate APU(auxiliary power unit) imported metal mounts with rubber mount that can be domestically produced. For this study, we analyzed in 3 kinds of rubber mounts hardness for the natural frequency to avoid the average excited frequency of the APU. In addition, allowed vibration acceleration of rubber mount confirmed to 90.8 g by adding a strength safety factor. To assure the validity of the design, we measure the vibration acceleration equipped with a metal mount and rubber mount 2 species(Hs 50 and 60). As a result, the proposed design method in this study is reasonable because the rubber mounts is excellent strength safety factor and vibration transmissibility than metal mounts.

• 보건의료산업학회지
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• 제6권1호
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• pp.53-63
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• 2012

The purpose of this study is to examine the influence of external image and self perfectionism on the depression. The survey collected 240 subjects from 3 university students in Seoul, Korea. The research period was from May to June of 2011 and the collected data were analyzed using the SPSS 15.0. As a result of this research, those with lower self image level, those with higher self perfectionism increased the depression level. It is necessary to develop programs for university students considering the fact that external image and self perfectionism influence on the depression. Moreover, it should be developed that solutions can decrease psychological pressure and overcome overwhelming expectation.

• 한국사이버테러정보전학회:학술대회논문집
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• 한국사이버테러정보전학회 2004년도 제1회 춘계학술발표대회
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• pp.181-185
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• 2004

최근에 피해가 보고되고 있는 인터넷 웜은 최초발생 후 단 며칠 만에 전 세계적인 피해를 입히고 있다. 이들 웜들은 메일을 비롯한 기타 여러 가지 경로를 통해 스스로 복제하는 성질을 이용하여 매우 빠른 속도로 전파가 가능하다. 하지만 이를 제대로 막을 수 있는 수단은 마련되지 못하고 있다. 따라서, 인터넷 웜으로부터 네트워크 자산을 보호하기 위해, 체계화되고 자동화된 방지 메카니즘의 인터넷 웜 분야의 연구가 필요하다 이에, 본 논문에서는 인터넷 일의 확산과 방어 모델을 기술하고자 한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.56.1-56
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• 2001

Initial attitude error is one of the large error sources in the navigation errors of SDINS. And it is important to decide the initial attitude of SDINS. The method, like a self-alignment or a transfer alignment method, is required to a precise INS. If we do not have a precise INS, we should get large attitude error. After performing the initial alignment, a vehicle has the initial attitude error. Therefore, it results in navigation error due to the initial attitude error. But, if we use position information during flight, we could estimate and compensate a vehicle attitude error. So, we can maintain a precise attitude in spite of existing the initial attitude error. Using the uplinked position information from a land-based radar system, the new algorithm estimates the attitude of the SDINS during flight ...

• Asian Journal for Public Opinion Research
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• 제4권4호
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• pp.246-259
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• 2017

The purpose of this study is to evaluate the effects of critical friends on self-esteem and the academic oral presentation ability of undergraduate students. A pretest was conducted in the first week of the semester. A pre-academic oral presentation preparation was held from the second week to the seventh week and followed by pedagogical speech activities from the eighth week to the eleventh week. The research instruments are Academic oral presentation behavior and self-esteem evaluation forms. The samples were 37 third year undergraduate students, who were purposively selected from the educational technology class at the Chulalongkorn University. The statistics used for analyzing quantitative data are frequencies, means, standard deviations, one sample t-tests, and Pearson's Product-Moment Correlations. It was found that the 37 third year undergraduate teacher students had higher self-esteem at the statistically significant level of .05 and academic oral presentation scores after the activity were statistically significant at the .05 level.

• 한국군사과학기술학회지
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• 제9권1호
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• pp.13-23
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• 2006

A propellant mainly consisting of nitric ester including nitrocellulose and nitroglycerine is characteristic of being decomposed naturally. And this phenomenon is known as being affected mostly by its storing temperature and humidity. In this research, the effect of storing temperature and humidity on self life has been studied by measuring the contained quantity of residual stabilizer of propellant KM30Al, which are parts of 155MM propelling charge K676 and K677; the method for the measurement is acceleration aging test, and decomposition reaction equation, Eyring Equation and Berthlot Equation were used for the calculation. As result of this study, it was found that the storing temperature influenced seven times as large as the storing humidity upon the self life of the propellant KM30Al, Furthermore, especially in the high temperature region, the storing temperature had a dominant effect on the self life.

• 수면정신생리
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• 제21권2호
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• pp.74-79
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• 2014

목 적 : 교대근무는 상당한 스트레스 상황이며 교대근무에 잘 적응하는 정도와 관련된 요인들을 아는 것은 중요하다. 본 연구에서는 교대근무 간호사들의 회복력과 관련된 수면 및 성격 관련 요인들을 조사해보고자 했다. 방 법 : 일 대학병원에서 3교대 근무를 하고 있는 간호사 95명을 대상으로 자가 설문지 조사를 시행했다. 코너-데이비드슨 회복력 척도, 병원 불안-우울 척도, 아침형-저녁형 질문지와 피츠버그 수면의 질 지수를 포함한 수면 관련 설문, 한국판 방어유형 질문지를 이용했다. 결 과 : 회복력과 유의한 상관을 보인 요소들은 근무자들의 나이, 근무 기간, offday oversleep, HAD-D 및 HAD-A 점수, DSQ의 적응적 방어유형, 자기억제적 방어유형이었다(p < 0.05). 다중회귀분석에서는 나이가 많을 수록(${\beta}=0.34$, p < 0.05), 우울 증상이 적을 수록(${\beta}=-0.25$, p < 0.05), 적응적 방어유형을 많이 사용할 수록(${\beta}=0.45$, p < 0.001), 자기억제적 방어유형을 적게 사용할 수록(${\beta}=-0.19$, p < 0.05) 회복력이 높은 것으로 나타났다. 방어기제들의 경우 체념이 적을 수록(${\beta}=-0.20$, p < 0.05), 승화(${\beta}=0.19$, p < 0.05)와 전능(${\beta}=0.19$, p < 0.05), 유머(${\beta}=0.20$, p < 0.05)를 많이 사용할 수록 회복력이 높은 것으로 나타났다. 결 론 : 본 연구에서는 일 대학병원의 3교대 근무 간호사들의 특정 방어유형 및 방어기제가 회복력과 관계된다는 것을 밝힐 수 있었다. 추후 더 많은 교대근무 간호사들을 대상으로 회복력과 관련된 수면 및 성격 관련 인자들을 밝히는 전향적 연구가 가능할 것이다.

• 품질경영학회지
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• 제35권2호
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• pp.45-52
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• 2007

The danger of self-ignition of single base propellants will increase with time. Therefore, a good prediction of the safe storage time is very important. In order to determine the remaining shelf-life of the propellants, the content of stabilizer is determined. The propellants stored under normal storage conditions about 10 to 18 years were investigated and accelerated aging test was carried out by storing propellant sample at higher temperature. Finally, we analyzed the results by various methods in order to show the best way to predict the realistic shelf-life. The safe storage life of the propellants will be 24 years, at least 15 years. In case of applying Arrhenius's law, using the reaction rate constant at 28$^{\circ}C$ to 30$^{\circ}C$ to predict the shelf-life by accelerated aging test is reasonable for a good prediction.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2006년도 추계 학술대회
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• pp.321-326
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• 2006

The danger of self-ignition of single base propellants will increase with time. Therefore, a good prediction of the safe storage time is very important In order to determine the remaining shelf1ife of the propellants, the content of stabilizer is determined. The propellants stored under normal storage conditions about 10 to 18 years were investigated and accelerated aging test was carried out by storing propellant sample at higher temperature. Finally, we analyzed the results by various methods in order to show the best way to predict the realistic shelflife. The safe storage life of the propellants will be 24 years, at least 15 years. In case of applying Arrhenius's law, using the reaction rate constant at $28^{\circ}C$ to $30^{\circ}C$ to predict the shelflife by accelerated aging test is reasonable for a good prediction.

• 산업공학
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• 제25권2호
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• pp.255-263
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• 2012

In order to ensure the reliability and specialty of weapon system test results, a policy of extending certified testing service institutions has been driven by applying accreditation system of the ones in defense industry. Bass and Logistic models are used to apply the policy effectively and forecast the diffusion pattern of certified testing service institutions. The parameters for diffusion forecast are estimated using the diffusion pattern of certified testing service institutions in non-defense industry, and these are applied to forecast the diffusion of certified ones in defense industry. Coefficients of innovation and imitation of Bass model are analyzed to derive the factors influencing the early adoption and diffusion patterns. The more increasing the coefficients, the earlier adoption occurred. Diffusion pattern due to coefficient of imitation, internal factor, has larger effect on sensitivity of diffusion pattern. This means that the self recognition of necessity is more effectively worked than the policy or regulations driven by government.