• 한국신뢰성학회지:신뢰성응용연구
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• 제17권2호
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• pp.129-135
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• 2017

Purpose: This article provides step-stress accelerated degradation test (ADT) plans based on the Wiener process. Method: Step-stress levels and the stress change times are determined based on the D-optimality criteria to develop test plans. Further, a simple grid search method is provided for obtaining the optimal test plan. Results: Based on the solution procedure, ADT plans which include the stress levels and change times are developed for conducting the reliability test. Conclusion: Optimal step-stress ADT plans are provided for the case where the number of measurements is small.

• 영어영문학
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• 제55권3호
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• pp.459-474
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• 2009

The Journal of English Language and Literature. The purpose of this study is to provide an optimality theoretic approach to NPIs (Negative Polarity Items) in English and Korean by proposing three universal constraints. The constraints are C-command Condition (CCC): NPI must be c-commanded by a constituent with negative meaning; Locality Condition (LOC): NPI must be bound in the local domain; Subjacency: NPI licensing must satisfy Subjacency Condition (SBJ); Previous analyses have shown that these three constraints control NPIs in one way or another. This study attempts to demonstrate that NPIs in both English and Korean languages can be nicely accounted for by setting a different constraint hierarchy for the two independent languages. That is, by slightly changing the constraint hierarchy, distributional differences of NPIs in both languages can be accounted straightforwardly within the framework of Optimality Theory.

• 대한토목학회논문집
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• 제7권1호
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• pp.23-31
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• 1987

본(本) 연구(硏究)는 처짐과 응력제약(應力制約)을 받는 평면(平面)뼈대의 정확(正確)한 최적설계(最適設計)를 얻을 수 있는 Optimality Criteria 방법(方法)을 제시(提示)하고 있다. 여기서 평면(平面) 뼈대의 맨 윗층의 횡변위(橫變位)만을 거동적(擧動的) 제약(制約)에 포함(包含)시킴으로써 수학적(數學的)으로 엄격(嚴格)하면서도 효율적(効率的)인 방법(方法)이 되도록 하였다. 부재(部材)의 휨응력(應力)은 fully-stressed-design의 개념(槪念)에 근거(根據)하여 부차적(副次的) 제약(制約)으로만 취급(取扱)되었으나 최종설계(最終設計)의 최적성(最適性)을 判별(判別)하기 위하여 최종(最終) 단계(段階)에서 이들을 모두 거동적(擧動的) 제약(制約)으로 취급(取扱)한 새로운 Optimality Criteria를 유도(誘導)하고 이의 만족(滿足) 여부(與否)를 알아 보도록 하였다. 이 방법(方法)은 단순(單純)하고 효율적(効率的)이면서도 엄격(嚴格)한 Optimality Criteria를 채용(採用) 함으로써 보다 나은 설계(設計)를 구(求)할 수 있음을 예제(例題)를 통(通)하여 보였다.

• Journal of applied mathematics & informatics
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• 제31권1_2호
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• pp.189-197
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• 2013

In this paper, Karush-Kuhn-Tucker type sufficient optimality conditions are obtained for a feasible point of a nonsmooth multiobjective fractional programming problem to be an efficient or properly efficient by using generalized ($F,{\rho},{\sigma}$)-type I functions.

• 대한수학회논문집
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• 제19권1호
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• pp.179-196
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• 2004

Mond-Weir type duals for multiobjective variational problems are formulated. Under generalized vector variational type I invexity assumptions on the functions involved, sufficient optimality conditions, weak and strong duality theorems are proved efficient and properly efficient solutions of the primal and dual problems.

• East Asian mathematical journal
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• 제31권5호
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• pp.737-742
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• 2015

In this paper, we consider a generalized fractional robust optimization problem (FP). Establishing a nonfractional optimization problem (NFP) equivalent to (FP), we establish necessary optimality conditions and duality results.

• 호남수학학술지
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• 제26권4호
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• pp.423-439
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• 2004

We are concerned with the robust control problem for the Keller-Segel equations with the distributed control and disturbance. We consider the present problem as a differential game finding the best control which takes into account the worst disturbance. We prove the existence of solutions and the optimality conditions to a corresponding problem.

• 한국경영과학회지
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• 제17권1호
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• pp.107-112
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• 1992

A slight extension of the classical saddle point and the global optimality condition has been discussed relative to some algorithmic implications. It also involves an economic interpretation which shows satisfying, rather than optimizing, decision making behavior under bounded rationality.

• 대한수학회논문집
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• 제19권3호
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• pp.557-567
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• 2004

We prove the sufficient conditions for optimality in differential inclusion problem by using the value function. For this purpose, we assume at first that the value function is locally Lipschitz. Secondly, without this assumption, we use the viability theory.

• Journal of applied mathematics & informatics
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• 제18권1_2호
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• pp.539-551
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• 2005

In this paper, sufficient optimality conditions and duality results for nonsmooth vector optimization problems are given under near invexity and infineness assumptions. Also, weak vector saddle-point theorems are obtained under near invexity-infineness assumptions.