• 음성과학
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• 제11권3호
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• pp.201-211
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• 2004

This paper introduces a development of an electrical stimulator for auditory stimulation. The electrical stimulator is useful in neurotological diagnosis, audiological evaluation, candidate selection for cochlear implantation, optimal device selection and decision making of MAP strategy for severe-to-profound hearing impaired persons. The development was based on sound parameters of auditory brainstem responses and auditory electrophysiological characteristic such as effective firing of auditory nerve and recording evoked potentials during refractory period of neuron. Besides pulse parameter could adjustable by programming for more varied electrical stimulation evoked response audiometry. Using the electrical stimulator, electrical square pulse was applied to promontory, and electrically evoked auditory brainstem response and electrically middle latency response were successfully recorded in cats.

• 콘크리트학회논문집
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• 제20권5호
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• pp.643-651
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• 2008

본 연구의 목적은 면진장치 설계 절차 체계화에 따른 면진건물의 응답특성을 사용지진 기록에 따라 평가하는데 있다. 이를 위한 대상 건물은 면진에 적합한 기초 면진 적용한 20층 주거 건물로, 지진기록 사용에 따른 응답특성을 평가하였다. 그 결과 면진건물의 시간이력해석을 위한 지진파의 선정은 응답 결과에 많은 차이가 발생할 수 있으므로 관련기준의 제정이 필요한 것으로 판단된다. 본 연구에서 제안한 지진기록을 이용한 면진구조물의 시간이력해석 결과, 면진층 변위, 층간변위비, 면진장치의 거동이 적절한 것으로 평가되었다. 결론적으로 본 연구에서 제안한 지진기록 및 면진장치 선정 결과, 설계된 면진건물의 지진저항 성능이 우수함을 확인할 수 있었다.

• Nuclear Engineering and Technology
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• 제49권4호
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• pp.825-837
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• 2017

Due to the severe impacts of recent earthquakes, the use of seismic isolation is paramount for the safety of nuclear structures. The diversity observed in seismic events demands ongoing research to analyze the devastating attributes involved, and hence to enhance the sustainability of base-isolated nuclear power plants. This study reports the seismic performance of a seismically-isolated nuclear reactor containment building (NRCB) under strong short-period ground motions (SPGMs) and long-period ground motions (LPGMs). The United States Nuclear Regulatory Commission-based design response spectrum for the seismic design of nuclear power plants is stipulated as the reference spectrum for ground motion selection. Within the period range(s) of interest, the spectral matching of selected records with the target spectrum is ensured using the spectral-compatibility approach. NRC-compliant SPGMs and LPGMs from the mega-thrust Tohoku earthquake are used to obtain the structural response of the base-isolated NRCB. To account for the lack of earthquakes in low-to-moderate seismicity zones and the gap in the artificial synthesis of long-period records, wavelet-decomposition based autoregressive moving average modeling for artificial generation of real ground motions is performed. Based on analysis results from real and simulated SPGMs versus LPGMs, the performance of NRCBs is discussed with suggestions for future research and seismic provisions.

• Industrial Engineering and Management Systems
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• 제16권1호
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• pp.64-79
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• 2017

Identifying disease genes from human genome is a critical task in biomedical research. Important biological features to distinguish the disease genes from the non-disease genes have been mainly selected based on traditional feature selection approaches. However, the traditional feature selection approaches unnecessarily consider many unimportant biological features. As a result, although some of the existing classification techniques have been applied to disease gene identification, the prediction performance was not satisfactory. A small set of the most important biological features can enhance the accuracy of disease gene identification, as well as provide potentially useful knowledge for biologists or clinicians, who can further investigate the selected biological features as well as the potential disease genes. In this paper, we propose a new stepwise random forests (SRF) approach for biological feature selection and disease gene identification. The SRF approach consists of two stages. In the first stage, only important biological features are iteratively selected in a forward selection manner based on one-dimensional random forest regression, where the updated residual vector is considered as the current response vector. We can then determine a small set of important biological features. In the second stage, random forests classification with regard to the selected biological features is applied to identify disease genes. Our extensive experiments show that the proposed SRF approach outperforms the existing feature selection and classification techniques in terms of biological feature selection and disease gene identification.

• 한국컴퓨터정보학회논문지
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• 제12권4호
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• pp.43-52
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• 2007

공개 웹 서비스의 수효가 증가하면 동일한 기능을 제공하는 웹 서비스가 여러 개 존재하게 될 것이다. 이들은 가격, 응답 시간, 가용성 등 다양한 QoS 특성들을 가지게 되는데, 주어진 QoS 제약을 만족하며 가장 적합한 서비스를 선택하는 것은 매우 중요한 작업이다. 본 논문에서는 비즈니스 프로세스의 병행 분기와 응답시간 제약을 중점적으로 고려하여 서비스의 선택 모형을 연구하였다. 다차원 다중선택 Knapsack 모형을 기본으로, 각 프로세스 실행 경로 별로 응답시간 제약조건을 갖는 방안과 전체 서비스 타입에 대하여 하나의 응답시간 제약조건을 갖는 방안, 그리고 특정 경로에 대해서만 응답시간 제약 조건을 적용하는 방안을 제시하고, 실험을 통하여 서비스 수, 병행 분기의 수 그리고 제약 조건 값의 크기 등의 변화에 따른 각 방안의 성능을 살펴보았다. 실험에 사용된 데이터를 기준으로 볼 때, 파레토 우세를 이용하여 후보 서비스 수를 줄이는 것은 매우 효과적이며, 중소규모의 복합 웹 서비스에서는 전체 서비스 타입에 대하여 하나의 응답시간 제약을 설정한 방안이 실행시간과 탐색 해의 최적 해 근접도 면에서 효율적인 것으로 분석되었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 춘계학술대회논문집
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• pp.407-412
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• 2000

Response surface method is employed in optimizing the acoustic performance of automotive engine-cooling axial fans. The effects of modifications in blade geometry on noise reduction are investigated. Taking the far-field noise level as the objective, a quadratic response surface is constructed utilizing D-Optimality condition as the candidate-points selection criteria. It is shown that the quadratic model exhibits an excellent fitting capability resulting in the blade design with low far-field noise level.

• Communications for Statistical Applications and Methods
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• 제7권1호
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• pp.165-178
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• 2000

Bayesian methods are considered for the multiple caputure-recapture data. Reference priors are developed for such model and sampling-based approach through Gibbs sampler is used for inference from posterior distributions. Furthermore approximate Bayes factors are obtained for model selection between trap and nontrap response models. Finally one methodology is implemented for a capture-recapture model in generated data and real data.

• 한국군사과학기술학회지
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• 제2권2호
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• pp.24-29
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• 1999

The purpose of this study is to develop a method of applying response surface analysis to trade-off techniques for the conceptual design of armored vehicle. The problem areas of concern are the use of this method in the selection of optimum design points when user requirements are in conflict. The application of this method to trade-offs of performance parameters in terms of weight are presented.

• 한국지진공학회논문집
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• 제15권5호
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• pp.1-10
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• 2011

본 연구에서는 지반운동 라이브러리에서 목표스펙트럼에 근사한 평균응답스펙트럼을 갖는 한 개 혹은 다수의 지반운동을 선정하는 효율적인 방법을 제안하고자 한다. 지반운동 선정 시 목표스펙트럼의 형상과 크기를 맞추어야 하는데 이 두 가지를 독립적으로 고려할 수 있다는 기존 연구결과에 따라 본 연구에서도 형상이 가장 유사한 지반운동을 찾고 크기를 맞추기 위하여 배율조정계수를 사용한다. 형상을 맞추기 위해 각 주기에서 목표스펙트럼과 지반운동 평균응답스펙트럼의 차이 값의 표준편차가 최소가 되도록 하여 선정하는 방법을 제안하였다. 형상이 결정된 후 그 크기를 맞추기 위해 본 연구에서 제안한 배율조정계수를 찾는 방법은 기존 연구와 달리 한번에 찾을 수 있도록 제안하였다. 40개의 지반운동 라이브러리로부터 제안한 방법을 이용하여 목표스펙트럼에 근사한 평균스펙트럼을 갖는 7개의 지반운동기록을 선정한 결과, 그 정확성과 계산소요시간에 있어 모두 만족할만한 결과를 보였다.

• 패션비즈니스
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• 제15권3호
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• pp.1-21
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• 2011

This study is designed to identify how Demographic Factors affect Fashion Orientation(value), Fashion Response, and Buying Criteria. A total of 355 usable data was collected from housewives in three metropolitan cities(Seoul, Daejeon, Sungnam) in Korea. Young housewives who have one child are a market segment whose buying power is recognized by both the retailers and the market. The housewives' fashion orientation consists of four categories : social orientation, practical orientation, political orientation, and aesthetic orientation. The housewives' fashion response is classified into three areas : self conscious, self esteem, and self monitoring. The criteria of buying children's wear consists of nine components. As a result, the key reason for buying children' wear was 'attractive design'. Research result showed that POLITICAL ORIENTATION(SE beta=.229, p<.001) was more effective than AESTHETICS ORIENTATION(SE beta=.203, p<.001), for enhancing SELF-CONSCIOUS RESPONSE and SELF-ESTEEM RESPONSE. Therefore, this study suggests that the key factor for understanding trend can be a human self concept, consciousness, values, and orientation. The housewives' fashion orientation is responsible for 18.7% of BRAND ROYALTY(F = 20.172, p<.001) from among nine buying criteria. More poignantly, POLITICAL ORIENTATION covered 66.9% of selection of BRAND ROYALTY, and it explained 34.6% of selection of DESIGN among nine buying criteria. Thus, it showed that POLITICAL ORIENTATION(SE beta=.331, p<.001) is more effective than SOCIAL ORIENTATION(SE beta=.146), for upgrading BRAND ROYALTY. In addition, it showed that POLITICAL ORIENTATION(SE beta=.238, p<.001) is more effective than AESTHETICS ORIENTATION(SE beta=.040) for upgrading DESIGN evaluation. Housewives' fashion orientation, and fashion response are differentiated by demographic factors, such as occupation, women's career, husband' job, income, and location related to social status.