• Nuclear Engineering and Technology
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• 제23권2호
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• pp.219-232
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• 1991

육지처분을 하기 위해 처분장에서 인수하는 방사성폐기물 고화체는 처분장의 조건에서도 안전한 격리성능을 지녀야 하는데, 이러한 일정한 기준과 이를 평가하는 기술의 개발을 위하여 외국의 인수기준과 고화체별, 관리공정별 주요 특성을 고찰하였다. 이를 통해 중요항목별로 평가사항 및 방법을 검토하였으며, 최종적으로 국내에서 발생되는 방사성폐기물 고화체가 처분장 인수시 꼭 갖추어야 하는“일반인수기준”을 제시하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.887-889
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• 1996

This paper presents Variance Reduction Techniques of the Monte Carlo Simulation considering Non-Exponential Distribution for Power System Reliability Evaluation. Generally, the components consisting of power system are assumed to be exponentially distributed in their state residence time. Sometimes, however, this assumption may cause a lot of errors in the reliability index evaluation. Non-exponential distribution can be approximated by a sum of several Erlangian distributions, whose inverse transform is easily calculated by using composition method. This paper proposes a new approach to deal with the non-exponential distribution and to reduce the simulation time by virtue of Variance Reduction Techniques such as Control Variate and Antithetic Variate.

• 비파괴검사학회지
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• 제23권6호
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• pp.616-621
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• 2003

There are various Non-Destructive Evaluation (NDE) techniques used for measurement of residual stresses in material, such as magnetic methods, X-ray diffraction, Ultrasonic velocity measurement etc. The capabilities, applications and limitations of these techniques for evaluation of cold work/plastic deformation were studied and compared. Mild steel plates were subjected to different degree of cold deformation and were analyzed by Magneto-mechanical Acoustic Emission (MAE), Barkhausen Noise (BN) and magnetic properties (hysteresis loop parameters analysis). Further, these specimens were analyzed by X-ray diffraction and ultrasonic velocity measurements. The microhardness measurement and microstructure studies of these cold worked plates were also carried out. The results of all these studies and comparison of different techniques are discussed in this paper.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2003년도 봄 학술발표회 논문집
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• pp.504-512
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• 2003

Simulation programs have been developed and used as an attempt to improve the accuracy of Non-Destructive Evaluation(NDE) techniques. The applicability of these programs is very limited, however, because it is difficult to describe the delicacy of the propagation of stress waves. To investigate the applicability of the finite element analysis for stress wave-based NDE techniques numerical simulation for Impact-Echo method and SASW method is performed. The numerical studies are performed to determine the essential parameters such as contact time of impact load, mesh size and time step size. These studies show that the choice of parameter is very important for improving the accuracy and confidence of the numerical procedure and, thereby, the applicability of the numerical analysis for stress wave-based NDE techniques

• 동력기계공학회지
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• 제15권1호
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• pp.18-23
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• 2011

Image processing has provided powerful techniques to extract from the acoustic signals the desired information on evaluation for leakage existence, leakage rate, and searching for leakage location, etc. The imagery NDE data available can add additional and significant dimension in nondestructive evaluation(NDE) information and thus for exploiting in applications. To extract such information the use of advanced image processing techniques is much needed. In recent years, there has been much increased use of acoustic signal image processing techniques in acoustic NDE. This approach will increase the efficiency of inspection procedures and reduce inspection time. In this paper we are concerned only with This paper is concerned mainly with the use of advanced image processing techniques in valve leakage detection and advanced image restoration and enhancement methods, which attempt to evaluate promptly by a visualization method the acoustic sources while detecting the valve leakage.

• 한국가스학회지
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• 제8권4호
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• pp.70-76
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• 2004

본 연구에서는 가스 산업 시설에서의 적합한 잠재위험성 확인 기법을 선정하기 위해 가스 산업 시설 및 12가지의 기법들을 분석하고, 기법 선정에 영향을 미치는 6가지의 요소를 적용하여 기법 선정에 대한 guideline을 제시하였다. 합리적인 기법의 선정을 위해서 선정에 영향을 미치는 요소들과 각 공정 또는 설비별 사고 발생의 원인과 결과를 8가지의 특성으로 분류하여 4가지의 index를 작성하였다. 또한, flowchart 형식의 의사 결정 과정에 작성된 index를 대입하여 사용이 부적합한 기법들을 소거하고, 최적의 기법 사용에 대한 대안을 제시할 수 있도록 하였다. 또한, 규제요건 비대상 사업장의 자체적 내부 안전성 향상을 위한 guideline으로 활용될 수 있을 것이다.

• 한국농촌건축학회논문집
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• 제14권1호
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• pp.45-56
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• 2012

This study focuses on design of supplementary evaluation indicator system geared towards comprehensive rearrangement projects in seats of township and town offices. In the first phase, it tries to reveal major problems and issues related to evaluation of the existing small town promotion projects. In terms of analytical tools, this study depends on the Delphi and AHP techniques. In specific, after three rounds of the Delphi methods, it extracts a series of alternative evaluation indicators derived from the AHP methods. It covers 5 major evaluation criteria, under which 18 independent items are hierarchically interconnected. It expects that these alternative evaluation indicators would contribute to selecting appropriate small town promotion projects. Next, applying these evaluation indicators, we examine couples of comprehensive rearrangement projects in seats of township and town offices. From the comparative contexts, we believe that the proposed alternative evaluation criteria would improve the general satisfaction level of key stakeholders in deciding the priority order of the small town promotion projects.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1998년도 춘계학술대회논문집
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• pp.93-98
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• 1998

Recently, consumers are tend to purchase the user-centered designed product using interface enginnering and human factors techniques. Therefore, it is important that the designer's requirements should be analyzed focused on the human machine interface. This paper described the interface usability evaluation technique(suvjective evaluation) for the interface between user and product. This methodology is the integrated interface usbility evaluation method AHP and Conjoint Analysis. AHP(Analytic Hierarchy Process) is a multicriteria decision model to give priority after expressing hierarchically for decision making problem. Conjoint Analysis enduavors to unravel the value, or partworths, that consumers place on the product or service's attributes from experimental subjects' evluation of profiles based on hypothetical products or services. A new usability test methodology proposed by this paper includes techniques jointed both consistency test by AHP and experimental subjective evaluation of profiles by Conjoint Analysis for evaluating the user's emotion and impression.

• 영재교육연구
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• 제5권2호
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• pp.17-36
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• 1995

The present study examined preschooler's (3-5yrs) representation and evaluation skills in a puzzle completion task. The puzzle contained panels of four children dressed for each seacon and the key to success was using a body scheme to reconstruct the panels (head, torso, legs, feet and sky on top). Baseline data (Study 1) revealed a developmental pattern of increasing bydy scheme representation along with more careful attention to season consitent construction. Spontaneous verbalization also shifted from more guiding statements (where'the head?) to move evaluative statements (this isn't right). Study 2 examined different intervention techniques for increasing representation (verbal laveling) and evaluative processes (error detection practice), along with a control group that had unassisted practice. Three year olds benefited from verbal labeling, four year olds from both types of training. Verbalizations also showed appropriated shifts toward increasing evaluation, particularly for the older children. These findings are discussed in terms of a developmental hypothesis that representation precedes evaluation skills and that training techniques should take into account the relative balance between representation and evaluation skills in the individual for the task at hand.

• 정보과학회지
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• 제5권2호
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• pp.41-48
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• 1987

어느 기관이 컴퓨터 씨스템을 처음 도입하고자 할때, 어떤 씨스템이 그 기관의 고유 업무를 수행하는데 가장 적합한지를 결정하는 일은 무엇보다도 중요 하다. 이와 같은 씨스템 능력 측정의 주요한 목적은 임대료와 컴퓨터 씨스템 구 성이 비슷한 경우 능력 측정을 하고자 하는 기관 고유 업무의 각 기종에 대한 상 대적인 thruput을 알아 보는데 있다.