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Online Ensemble Topology Selection in Expensive Optimization Problems
Yoel Tenne 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.4
Simulation-driven optimization problems are often computationally-expensive, an aspect which has motivated the use of metamodels as they provide approximate function values more economically. To further improve the prediction accuracy the use of ensembles has been explored in which predictions from multiple metamodels are combined. However, the optimal ensemble topology, namely, which types of metamodels it includes, is typically not known, while using a fixed topology may degrade the prediction accuracy and search effectiveness. To address this issue this paper proposes a metamodel-assisted algorithm which autonomously adapts the ensemble topology online during the search such that an optimal topology is used throughout. An extensive performance analysis shows the effectiveness of the proposed algorithm and approach.
Yoel TENNE 한국항공우주학회 2009 한국항공우주학회 학술발표회 논문집 Vol.2009 No.4
Modern engineering design optimization uses computer simulation s and as such it requires optimizing expensive black-box functions. To efficiently handle such challenging optimization problems we have proposed an algorithm which uses several approaches such as global-local search, modelling and model selection and an efficient trust-region search. Performance analysis with both mathematical test functions and a real-world application show the proposed algorithm outperforms a reference algorithm representative of many existing algorithms.
Israeli Journalists & Religious Identity
Yoel Cohen 한국언론학회 2016 Asian Communication Research Vol.13 No.2
Journalists play an important role in the construction of the image of religion in the media. In Israel the secular-religious divide has resulted in the media being seen as contributing to the perceived negative image which religious communities, in particular the Haredi ultra-Orthodox, enjoy. This paper seeks to throw light upon Israeli journalists’ religious beliefs and observance of religious customs. Given that journalists’ work values emphasise freedom of the media and the right to know it is instructive to throw light on how journalists negotiate their religiousity. This is important in understanding how religion is covered in Israel. Does a perceived anti-religious bias in the Israeli media reflect the religious identity of Israeli journalists–or not? But a poll by this author of 260 Israeli journalists about Jewish religious identity while confirming that Israeli journalists favor the separation of synagogue and state found there was little or no difference between the positions of Israeli Jewish journalists and that of the broader Israeli Jewish population on existential questions like belief in God. Nor were there any significant differences regarding religious activity like observance of religious holidays or Jewish life cycle events between the journalistic community and the rest of the Israeli Jewish population.
Measuring the Preservation Value for Endangered Wildlife in Korea
Sang yoel Han,Tae kyun Kim,Kwan Choi 한국농업경제학회 2000 農業經濟硏究 Vol.41 No.4
This article estimates the preservation value of Manchurian black bear, a prominent endangered wildlife species, in South Korea. A dichotomous-choice contingent valuation with actual payment is used to estimate the preservation value including option. existence, and bequest values. This study also reveals some variables of explaining the preservation value. The results show that the preservation value is estimated to be U.S. $4.86 per household. Results also indicate that the variable of environmental attitudes is important in explaining willingness to pay. The findings suggest that visitors of Chirisan National Park strongly support for the preservation of endangered wildlife species.
프로그램 합성 기법을 이용한 임베디드 소프트웨어의 모델 체킹 효율성 향상을 위한 사례 연구
김요엘(Yoel Kim),최윤자(Yunja Choi) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.12
C언어로 작성된 임베디드 소프트웨어를 엄밀히 검증하기 위해 모델 검증기 CBMC을 사용할 수 있으나, 소프트웨어가 복잡할수록 검증 효율성이 크게 감소하는 문제가 있었다. 이를 해결하기 위한 방법으로 프로그램 합성 기법을 사용해 검증 대상 함수를 좀 더 단순한 형태의 동일 행위를 갖는 함수로 합성함으로써 검증 시간을 단축하려는 시도가 있었으나, 합성 기법은 큰 사이즈의 배열을 가진 함수의 합성 정확도가 낮아 실제로 검증에 적용하기 어려웠다. 이를 해결하기 위해 본 연구에서는 배열 인덱스 계산식 및 배열 입력 범위 분석을 통해 검증에 필요 없는 입력 범위를 제거하여 합성 난이도를 줄였고, 기존 보다 더 정확하면서 간결한 함수를 합성할 수 있었다. 이를 Object Follower 예제에 적용한 결과 CBMC 실행 시간이 10배 이상 단축되었으며, 검증 결과의 신뢰성을 높일 수 있었다.
A change point estimator in monitoring the parameters of a multivariate IMA(1, 1) model
Sun Yoel Sohn,Gyo Young Cho 한국데이터정보과학회 2015 한국데이터정보과학회지 Vol.26 No.2
Modern production process is a very complex structure combined observations which are correlated with several factors. When the error signal occurs in the process, it is very difficult to know the root causes of an out-of-control signal because of insufficient information. However, if we know the time of the change, the system can be controlled more easily. To know it, we derive a maximum likelihood estimator (MLE) of thechange point in a process when observations are from a multivariate IMA(1,1) processby monitoring residual vectors of the model. In this paper, numerical results show that the MLE of change point is effective in detecting changes in a process.