• Journal of the Korean Data and Information Science Society
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• 제18권2호
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• pp.553-560
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• 2007

In this paper, we consider two components system which lifetimes have Freund's bivariate exponential model with equal failure rates. We propose Bayesian multiple comparisons procedure for the failure rates of I Freund's bivariate exponential populations based on Dirichlet process priors(DPP). The family of DPP is applied in the form of baseline prior and likelihood combination to provide the comparisons. Computation of the posterior probabilities of all possible hypotheses are carried out through Markov Chain Monte Carlo(MCMC) method, namely, Gibbs sampling, due to the intractability of analytic evaluation. The whole process of multiple comparisons problem for the failure rates of bivariate exponential populations is illustrated through a numerical example.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2000년도 춘계학술대회논문집
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• pp.40-43
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• 2000

A process optimal design methodology applicable to steady-state forming with a strain-hardening material is presented. in this approach the optimal design problem is formulated on the basis of a rigid-viscoplastic finite element process model and a derivative based approach is adopted as an optimization technique The process model the schemes for the evaluation of the design sensitivity considering the effect of strain-hardening and an iterative procedure for design optimization are described. the validity of the proposed approach is demonstrated through application to die shape optimal design in extrusion.

• 제어로봇시스템학회논문지
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• 제8권10호
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• pp.847-850
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• 2002

Stochastic process analysis is often based on Monte Carlo simulations. As a more rigorous alternative, a deterministic algorithm based on numerical integration is proposed in this paper. which calculates the probability distributions of dependent random variables using the results of simulation with grid points of independent random variables. For performance evaluation, the proposed algorithm is applied to an example problem which can be analytically solved. and the result is compared with that of Monte Carlo simulation. The proposed algorithm is suitable for general process simulation problems with a few independent random variables, and expected to be applicable to areas such as safety analysis and quality control.

• Journal of Information Processing Systems
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• 제7권4호
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• pp.653-678
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• 2011

WiMAX is intended for fourth generation wireless mobile communications where a group of users are provided with a connection and a fixed length queue. In present literature traffic of such network is analyzed based on the generator matrix of the Markov Arrival Process (MAP). In this paper a simple analytical technique of the two dimensional Markov chain is used to obtain the trajectory of the congestion of the network as a function of a traffic parameter. Finally, a two state phase dependent arrival process is considered to evaluate probability states. The entire analysis is kept independent of modulation and coding schemes.

• 한국콘텐츠학회논문지
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• 제18권4호
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• pp.347-356
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• 2018

본 연구는 NCS기반 수업의 효과성과 매력성을 알아보기 위해 교수자의 관점에서 직무수행능력 평가횟수와 학습만족도 및 학습성과와의 관련성을 규명하고자 하였다. 연구결과, 교수자들은 NCS기반 수업에서 직무수행능력 평가횟수 3회 이상 적용할 때, 그리고 1회 평가시 평가방법 갯수 3개 이상 적용할 때 학습만족도가 더 높다고 인식하고 있었다. 반면 통계적으로 유의하지는 않았으나, 직무수행능력 평가횟수 3회 이상일 때와 평가 1회당 평가방법 갯수 3개 이상 적용할 때 학습성과가 더 높다고 인식하고 있는 것으로 나타났다. 본 연구결과를 통해 NCS기반 수업에서 직무수행능력 평가횟수와 평가방법 갯수가 학습과 관련있는 잠재적 구인임을 확인할 수 있었다. NCS기반 수업에서 직무수행능력평가가 학습성과를 평가하는 것 뿐 아니라 교수학습 활동의 일환이자 과정적 도구의 개념으로 적용된다면, 수업의 효과성과 매력성을 높이는데 기여할 수 있을 것으로 판단된다.

• 대한간호학회지
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• 제42권7호
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• pp.917-927
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• 2012

Purpose: A curriculum development model is presented to examine the processes necessary to develop new programs or evaluate existing programs within the philosophy of outcomes-based education in nursing, especially in the context of accreditation. The philosophy of outcomes-based education is to produce individuals who can demonstrate the evidence of competencies in designated areas of education. For nursing education, this means competencies in performing the role of professional nursing as defined by the profession and social needs at the beginning level upon completing a nursing program. Methods: A curriculum development model has been developed analytically based on the literature and experiences. Results: A 10-step process framework incorporating the tenets of outcomes-based nursing education is illustrated. Conclusion: This curriculum development framework can be applied in developing new educational programs in nursing or to evaluate and revise existing programs in anticipation of the accreditation process that is moving with a full force in such countries as Korea.

• 한국정보시스템학회지:정보시스템연구
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• 제27권3호
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• pp.25-42
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• 2018

Purpose The purpose of this study focused on adopting production systems in cognitive psychology to improve the extraction process of persuasive design characteristics for healthcare-related mobile applications. Design/Methodology/Approach A research approach with four stages was developed. We developed and updated the evaluation guideline for persuasive design characteristics (PDC). We tried to summarize and analyze each of 28 PDC and prepared related production rules. Verification process for both guideline approach and production system approach were performed. Top one hundred apps from both medical category and health and Fitness category were selected and evaluated by two approaches. By comparing the results of the two approaches, we tried to explain the improvement and reliability of introducing the production system in the PDC extraction process. Findings Based on the updated guideline for healthcare-related mobile applications, a production system in cognitive psychology was developed. By comparing the PDC extraction results by two approaches, production system showed a better improvement for evaluation precision and efficiency for decision-making process. The findings of this study can be used for researchers and app developers to apply production system to analyze, evaluate, and develop better healthcare-related apps with persuasion.

• 청정기술
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• 제9권3호
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• pp.145-151
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• 2003

청정생산방법론을 적용하여 염료생산공정의 청정화를 꾀하고자 하였다. 본 고에서는 반응중에 사용되는 공정수와 유기용매인 DMF의 회수방안을 모색하고, 고급산성염료 제조공정 보완을 통한 제품질 향상 방안을 마련하고자 하였다. 청정생산방법론의 적용순서는 기업경영진의 결정, 대안도출, 대안평가 및 우선순위 결정, 실행, 모니터링 및 지속적 실행단계의 절차를 따라 수행하였으며, 이의 수행결과 DMF의 회수와 함께 용수사용량을 25% 이상 절감할 수 있었으며, 고급산성염료의 경우 2배 이상의 용해도 향상을 통하여 제품의 가치를 상승시킬 수 있었다.

• 대한산업공학회지
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• 제40권1호
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• pp.43-51
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• 2014

Statistical process control (SPC) is an important technique for monitoring and managing the manufacturing process. In spite of its easiness and effectiveness, some problematic sides of application exist such that the SPC techniques are hardly reflect the changes of the process conditions. Especially, update of control limits at the right time plays an important role in acquiring a reasonable performance of control charts. Therefore, we propose the control chart performance evaluation index (CPEI) based on count data model to monitor and manage the performance of control charts. The CPEI could indicate the degree of control chart performance and be helpful to detect the proper update cycle of control limits in real time. Experiments using real manufacturing data show that the proper update intervals are made by proposed method.

• 한국안전학회지
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• 제37권5호
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• pp.22-32
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• 2022

The domestic smart factory is being built and spread rapidly, mainly by mid-sized companies and large enterprises according to the government's active introduction and support policy. But these factories only promote production system and efficiency, so harmfulness and risk factors are not considered. Therefore, to derive harmful risk factors in terms of industrial safety for 12,983 government-supported smart factory workplaces from 2014 to 2019, industrial accident status analysis compared workplaces with automation facilities and government-supported workplaces with automation facilities. Also, to reduce risks associated with domestic smart factory processes, twenty government-supported workplaces with automation facilities underwent analysis, evaluating risks through a status survey using the process evaluation table. In addition, the status survey considered region, size, industry, construction level, and accident rate; the difference in risk according to the structure of the process was confirmed. Based on the smart factory process evaluation results, statistical analysis confirmed that serial, parallel, and hybrid structures pose different risk levels and that the risks of mixed structures are greater. Finally, safety control system application was presented for risk assessment and reduction in the smart factory process, reflecting the results of disaster analysis and actual condition investigation.