• Asia Marketing Journal
• /
• v.2 no.2
• /
• pp.114-141
• /
• 2000

본 연구는 판매원의 판매노력을 효율적으로 일하는 것과 열심히 일하는 것으로 나누고, 판매노력이 목표수준과 성과에 어떠한 영향을 미치는지를 검증하였다. 그리고, 효율적으로 일하는 것과 열심히 일하는 것, 목표수준에 대한 선행요인으로 개인적 변수에 해당하는 경쟁심(경쟁기질)과 자기효능을, 환경변수에 해당하는 심리적 경쟁분위기와 판매관리자 신뢰도를 탐색하여 성과에 대해 간접효과가 있는지를 검증하였다. 보험설계사를 대상으로 설문조사하여, 265부를 실증분석 한 결과 열심히 일함은 목표수준에 영향을 미치며, 목표수준은 성과에 영향을 미치는 것으로 나타났으나, 효율적으로 일함과 열심히 일함의 성과에 대한 영향은 비유의적이었다. 매개변수(효율적으로 일함, 열심히 일함, 목표수준)에 대한 선행요인의 영향에 대해서는 개인변수인 경쟁심과 자기효능은 모두 유의적이었으나, 환경변수는 심리적 경쟁분위기만이 효율적으로 일함에 유의적이었다. 결과적으로 판매원의 성과에 대한 자기효능과 경쟁심의 효과는 열심히 일함 그리고 목표수준에 의해서 매개됨을 확인하였다.

• Journal of Advanced Navigation Technology
• /
• v.12 no.6
• /
• pp.681-690
• /
• 2008

The software reliability have to be improved as one major method to enhance the quality of developed software, and its defect is detected and modified through testing as a direct way to meet the purpose before releasing. Once its reliability grows up to the target and it is released to public. there may be operational reliability problem. The operational software reliability trend may be different depending on the condition whether it is universal or dedicated. And its reliability estimation is changed based on the condition if it follows uniform testing efforts or Weibull testing efforts. I study the operational reliability trend of dedicated software, applying two case testing efforts for the released item.

• The Journal of the Korea Contents Association
• /
• v.16 no.10
• /
• pp.382-392
• /
• 2016

This study organize a self-directed learning in complex structures. And based on this, It was developed self-directed learning scale for university students. It was a analyzing literature and reviewing previous studies for developed scale. Therefore, Self-directed learning model was configured into motives, performance behaviors, and learning management behaviors. On the basis of this, the present study constructed 19 sub-factors and developed 114 scale items. First, a preliminary scale was developed and its reliability was assessed by administering the scale to 128 students attending A university. The result showed that the reliability of every sub-factor was good and, therefore, the scale was developed with no item removed. To verify the validity of the scale, this study evaluated reliability and construct validity by administering the scale to 674 students going to A university. The reliability and validity of all sub-factors were found to be good. A confirmatory factor analysis was performed to verify construct validity and the result revealed that the first model was not an appropriate model. For this reason, the first model was modified once by taking the model modification index into account and it was found that ${\chi}^2$ (563.254), CFI=.963, NFI=.951, RMSEA=.064. Thus, the model was verified as a valid model. The results of this study imply that it is possible to point out learners' weaknesses and strengths by measuring activities taking place in the learning process in detail.

• Journal of the Korean Institute of Gas
• /
• v.6 no.1 s.17
• /
• pp.66-73
• /
• 2002

In this study a new SIS evaluation method based on the reliability analysis has been developed. It evaluates the Safety Integrity Level (SIL) using the Fault Tree Analysis (FTA), and when the SIL falls short of the systems target level, through the reliability analysis and system retrofit, this method will satisfy the aimed SIL. A hazard evaluation was carried out on the 415V Diesel BUS to verify the SIL evaluation method based on the reliability analysis. The availability of the original 415V Diesel BUS was $99.40\%$, which comes under the category of SIL 2. After exchanging the diesel generator and the isolator switch using the developed evaluation method, the availability rose to $99.94\%$, SIL 3. By applying the method presented in this study, not only will it reduce the maintenance cost due to the prevention of accidents and reduction of loss, but also maximize the reliability of the system.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.9 no.1
• /
• pp.100-108
• /
• 2021

The purpose of this study is to analyze the reliability index of a design by applying the reduction factor of the recently developed fiber reinforced high strength concrete design guideline(draft). By collecting material and member test data performed for the development of the design guideline(draft), statistical characteristics of material strength and member strength analysis equations are obtained. A simul ation that appl ies the material statistical characteristics and the member anal ysis equation of the design guidel ine(draft) is performed, and the statistical characteristics of the section strength are calculated by combining the statistical characteristics of the analysis equation. Reliability analysis was performed by applying the load combination of the domestic highway bridge design code and concrete structural code, and it was confirmed that the design that applies the reduction factor for materials and members suggested in the design guideline(draft) satisfies the target reliability index.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.8 no.2
• /
• pp.1-11
• /
• 1988

The flexible highway pavement is a layered structure. The safety of the pavement is a function of the load induced by traffic and the layer strength of asphaltic concrete mixture. Therefore, the probabilistic approach was applied to the pavement system to evaluate the reliability. Monte Carlo simulation technique was used for the reliability study. Data used were colleted from the field or literature. A critical tensile strength for each layer was estimated based on a target reliability from the simulation. The critical strength was evaluated by comparing the strengths with the actual surface distress. The result shows that the critical strength estimated in the probabilistic approach is valid for the current highway condition.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.21 no.3
• /
• pp.224-229
• /
• 2009

Partial safety factors(PSFs) for Level I reliability based design of caisson type quay walls were calculated. First order reliability method(FORM) based PSFs are the functions of sensitivities of limit state function with respect to design random variables, target reliability index, characteristic values and first moment of random variables. Modified PSFs for water level and resilient water level are newly defined to keep consistency with the current design code. In the numerical example, PSFs were calculated by using a target reliability index. Seismic coefficient is defined to show extreme distribution. It was found that PSFs for seismic coefficient becomes smaller as the return period for design seismic coefficient grows longer.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.04a
• /
• pp.145-148
• /
• 2008

Recently, most of the international design code for concrete structures are trying to develope performance-based design specification with the limit state concept. To accomplish this object, it is necessary to define required performance and to measure the performance level of structure. The reliability index is one of the most attractive indexes to express the level of performance. In this paper, prestressed concrete beam is designed following member resistance factor and material resistance factor format and the reliability indexes are obtained and compared for different sets of resistance factors. Compatible sets of safety factors could be calibrated for given level of target reliability index applying the similar method presented in this paper.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.14 no.2
• /
• pp.213-224
• /
• 2001

확률론적 구조설계 최적화는 구조물의 역학적 특성이나 하중의 불확실성이나 임의성과 같은 변동성을 정량적이고 합리적으로 고려할 수 있다는 점에서 기존의 전통적인 확정론적 최적화와 비교된다. 확률론적 최적화의 방법론으로는 개선된 일계이차모멘트법을 이용하는 신뢰도지수에 기반한 접근법(MPFP search)이 널리 알려져 있으며, 최근 목표성능치에 기반한 접근법(MPTP search)이 새롭게 제안되었다. 본 논문에서는 이들 두 가지 접근법에 대한 정식화를 수행하고, 특히 탐색과정에서 소모적인 반복계산을 발견하고 제거하는 알고리즘을 제시하였다. 예제에서 두 접근법에 의한 확률론적 최적화를 수행하고 구조설계 최적화의 관점에서 두 접근법의 장단점을 비교·검토하였다.

• Proceedings of the Korean Reliability Society Conference
• /
• 2002.06a
• /
• pp.211-216
• /
• 2002

실제적인 문제에서 신뢰성 기반 최적 설계(RBDO)를 구현하기 위해서는 유한요소 모델을 해석하기 위한 상용 프로그램과 설계한 것에 대한 신뢰성을 산정할 수 있는 프로그램을 통합하고 최적화 알고리듬을 적용하여야 최적화를 수행하여야만 한다. 또한 최적화 과정에서 최적상태에서 제약조건이 비활성 영역에서 놓이게 되는 것을 방지하기 위해서 제약조건 최적화 문제를 비제약 조건 최적화 문제로 바꾸어 주는 장애 함수를 사용하여 최적화를 수행하였다. 그리고 이 방법론을 기존의 신뢰성기반 최적화 방법론, 즉 신뢰도지수 접근방법과 목표성능치 접근방법과의 비교를 하였다.