• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.12a
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• pp.133-136
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• 2000

에너지 차분 흥부 X선 화상으로부터 폐종류 음영을 검출하기 위한 필터를 예측해서 전문의의 진단보조 혹은 총합자동진단시스템의 구성 요소로서 필터가 발휘한 역할을 고려한 후, 구체적인 성능 평가 방법을 제안한다. 필터의 성능을 평가할 때 문턱값을 변화시킨 경우, 못보고 빠트린 비율과 잘못 본 비율의 변화를 ROC 곡선으로 나타내어 이것에 기초한 판단을 행하는 접근방법이 있다. 본 연구에서는 이와같은 평가에 대한 구체적인 예를 통하여 문제점을 명확히 하여 그 평가기준을 마련한다. 성능 평가를 행하기 위해 이용된 에너지 차분화상으로서, 임상 데이터 14개의 증예를 이용한다. 즉, 총 종류수 32개 한 개의 증예에 있어서 종류의 개수는 1~8개로 평균 2개, 1mm 당 샘플링 간격 5 픽셀, 비트 분해능 10 bit의 저압화상으로, 그 크기는 1760$\times$1760이다. 계산기 하드웨어의 제약으로부터 원화상을 가우스 함수로 평활화 해서 1/8로 축소한 화상으로 실험을 행한다. 상기 평가 절차에 따라, 이전에 개발된 다중해상도 ∇$^2$G 필터의 성능을 평가하고, 단일해상도 ∇$^2$G 필터와의 비교를 통해 그 성능이 우수함을 확인한다. 본 평가 방법은 화상진단 지원용 필터의 평가에 대해서 적용될 수 있을 것이다.

• International Journal of Highway Engineering
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• v.14 no.2
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• pp.165-174
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• 2012

In this study, a method for evaluating the performance of speed measurements was developed to assess the qualities of a vehicle detector. The evaluation method considers measurement errors that are reflected in a reference speed. For this, the concept of uncertainty in measurement was applied to the development method. Other factors such as precedent study, statistical processing techniques, and speed measurement performance method of traffic enforcement equipment and vehicle detection systems were also reviewed. Through this process, the problems of the existing evaluation methods were derived and developed for the new performance evaluation method. Vehicle detectors that are installed in the field were evaluated using the traditional assessment methods and the developed method. As a result, for traditional assessment methods, it was found that evaluation criteria are acceptable, while developed method's criteria are not acceptable. This means that traditional assessment methods do not sufficiently consider errors in measurement, so it has potential to over-estimate for performance of evaluation equipment. On the other hand, it was represented that the developed method should include variable factor such as errors in measurement and more precise compared to traditional assessment methods.

• Journal of the Earthquake Engineering Society of Korea
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• v.15 no.3
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• pp.57-64
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• 2011

In this study, a seismic performance evaluation of unreinforced masonry buildings was conducted based on a revised draft of the outline of the seismic performance evaluation of existing buildings. The procedure of the performance evaluation is composed of three-steps, which are a preliminary evaluation, a first-level detailed evaluation, and a second-level detailed evaluation, where evaluation is conservatively conducted in the beginning and then more detailed evaluations are gradually conducted. For the study, ten two-story unreinforced masonry buildings were selected and evaluated using the three-step evaluation. The result showed that the performance levels between the preliminary and the first-level detailed evaluations were reversed, which is different from the intent of the procedure. Therefore, in the near future, the problems in each evaluation step that are presented in the results of this study need to be refined.

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.72-72
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• 2015

메모리 반도체 세계 시장 점유율 1위 뿐만 아니라 국내 전체 산업 가운데 가장 중추적인 역할을 하는 반도체 산업의 지속적인 성장과 국가 경제의 발전을 위해서 소자 업체 뿐만 아니라 장비, 소재, 부품 산업의 동반 성장은 반드시 필요하다. 그 중에서 특히 소재, 부품 산업을 발전시키는 것이 국산 반도체 장비의 시장 점유율이 낮은 현 시점에서 가장 필요한 선택이다. 반도체 소재, 부품 산업의 발전을 위해서 제일 먼저 해야할 일은 영세한 국내 반도체 소재, 부품 산업을 활성화 시키는 것이며, 지속 적인 연구 개발, 성능 평가 방안 확보, 수요 업체와의 연계 방안 확보 등이 주요 현안이다. 반도체 소자 업체, 장비 업체에서 원하는 소재 및 부품의 성능을 만족하는 제품을 만들기 위해서는 우선 소재 및 부품의 기본 특성을 만족하는지에 대한 평가가 필요하고, 더 나아가서는 디바이스의 특성을 만족시켜줄 수 있는 한 단계 상향된 수요자의 요구 조건을 만족 시켜줄 수 있어야 한다. 본 연구에서는 그 중 특히 중요한 요소인 성능 평가에 대해서 논하고자 한다. 우선 반도체 공정용 소재에 대해서 살펴 보면 대표적인 반도체 소재로 증착용 Precursor, Photo Resistor, Sputter Target 등이 있다, 평가 방법으로는 ALD용 Precursor의 경우 대기 노출시 폭발, 화염 발생 등의 위험 요소를 안고 있어 특별한 주의가 요구 된다. PR이나 Sputter Target은 상대적으로 위험성은 적으며, 다양한 성능 평가 들이 가능하다. 다음으로 부품 평가에 대해서 살펴 보자. 본 원에서 가장 많이 진행된 부품 평가는 개발된 Pump의 성능 평가이다. 개발된 Pump는 1차적으로 KRISS 진공센터 에서 기본 Pumping 능력 평가를 실시하고, 다음으로 공정 평가를 실시한다. Pump마다 특성이 달라서 각 펌프의 성능 평가에 적합한 공정과 장비를 우선 선정하고 그에 합당한 공정을 진행하여 평가를 실시한다. 고 진공용인 Cryo Pump는 순수한 물질의 증착이 중요한 Metal Sputter 공정 장비에 장착하여 공정용 Gas를 흘리면서 Pump의 구동에 따른 성능 평가를 하고, 다음으로 실제로 Metal Sputter를 실시해서 Wafer에 증착된 물질의 특성을 확인한다. 다음으로 Turbo Pump의 경우 Etch 장비에 장착하여 Etch Uniformity, Etch Rate, By-product 배출 정도에 대해서 평가를 한다. Dry Pump는 비교적 공정 압력이 낮은 PECVD 공정 장비에서 평가를 진행 한다. 마지막으로 공정 진단, 챔버 상태 진단 등을 할 수 있는 별도의 부품 또는 장치로 PBMS, PCDS, OES 등의 평가에 대해서 논한다. 본 장치들은 실제 반도체 공정 장비와 환경에서 평가가 되어야지만 최종 사용자 입장에서 신뢰를 가지고 결과에 대해서 접근할 수 있다. 위에 논의된 장치들은 현재 공정 장비에 부착되어서 판매 되고 있는 것이 아니라 수요가 많지 않으나, 자체 성능 개선과 적합한 평가를 통해서 장치의 성능이 인정되면 300 mm 이상 Wafer 공정에서 반드시 필요한 실시가 공정 진단을 위해서 폭발적인 수요를 창출할 수 있으리라 본다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.17 no.5
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• pp.553-561
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• 2015

In this study, the performance assessment criterion for reasonable maintenance of shield TBM tunnel was presented. The performance assessment items such as crack, leakage, breakage, spalling, exfoliation/detachment, efflorescence, quality condition, exposure of steel, carbonation, faulting step, bolts condition, drainage condition, ground condition, contact section condition and conduit condition were selected by analyzing domestic and foreign performance assessment criterions and investigating segment lining deterioration cases through the site investigation and in-depth inspection analysis result on the shield TBM tunnel. In addition, the reasonable weight using AHP (Analytic Hierarchy Process) were estimated.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.8 no.6
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• pp.98-111
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• 2009

The objective of this study is to revise the related regulations and laws of intelligent transport systems performance tests and methods. This study improves the reliability of present traffic information, reduce public discontent by systematic reforms and reduce national and social costs through the analysis of intelligent transport system performance tests'current status and problems. This study will maximize the investment profits and efficiency of ITS system as the reliability of transportation information which is created through the maintenance of ITS equipment and center, systemization of work responsibility through close analysis of ITS performance test and overall evaluation of role of ITS performance assessment organization will improve and new level of service will be born.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.296-300
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• 2004

As a building aged, overall performance considering structural safety, equipment safety and fire safety is lowering gradually. Since the building performance and the overall value of the building change as time elapse, exact safety performance of the building should be evaluated not only maintaining the building efficiently and also preventing disputes between buyer and seller of the building. We suggest major elements for assessing building's safety performance through surveying literatures, interviewing experts, reviewing existing assessment models, The assessment elements proposed here ate comprised of structural safety, equipment safety, fire safety, fire protection and fire escape, etc. This study helps to make a safety performance assessment criteria for a building.

• Journal of the Korea Society of Computer and Information
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• v.17 no.4
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• pp.83-90
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• 2012

In e-commerce systems that deal with a large number of items, the function of personalized recommendation is essential. Collaborative filtering that is a successful recommendation algorithm, suffers from the sparsity, cold-start, and scalability restrictions. Additionally, this work raises a new flaw of the algorithm, inconsistent performance of recommendation. This is also not measurable by the current MAE-based evaluation that does not consider the deviation of prediction error, and furthermore is performed independently of precision and recall measurement. To evaluate the collaborative filtering comprehensively, this work proposes an extended evaluation model that includes the current criteria such as MAE, Precision, Recall, deviation, and applies it to cluster-based combined collaborative filtering.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.3
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• pp.190-198
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• 2020

For domestic urban railways, which have a 19.7% aging rate, a performance evaluation is necessary to establish capital improvement investment plans. The performance evaluation, which was recently enacted in the relevant law, points out the excessive time and effort for acquiring data and evaluation. This study developed a performance evaluation simulation prototype using a virtual reality (VR) method to use as training contents for railway performance evaluations. The practical use of the VR technique to reduce the working time under poor environment conditions was confirmed through a literature review. A survey and consultation were conducted for urban railway experts to determine the weight of the performance evaluation items and the facility breakdown structure. This information was utilized to develop performance evaluation sheets for simulation. Based on the evaluation sheet, a training content prototype that evaluates the performance of platform safety doors was developed using VR techniques with HTC VIVE equipment. VR simulation tests were conducted for six players, and the prototype was sufficiently advantageous for a visual confirmation of the facility information. The result is expected to be useful for engineers to understand the performance evaluation process efficiently before an actual performance evaluation of urban railway facilities.

• Journal of the Korean Institute of Intelligent Systems
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• v.13 no.4
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• pp.439-447
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• 2003

This paper proposes a proportional-integral-derivative (PID) evaluation method for enhancing performance of genetic algorithms. In PID evaluation, the fitness of individuals is evaluated by not only the fitness derived from an evaluation function, but also the parents fitness of each individual and the minimum and maximum fitness from initial generation to previous generation. This evaluation decreases the probability that the genetic algorithms fall into a premature convergence phenomenon and results in enhancing the performance of genetic algorithms. We experimented our evaluation method with typical numerical function optimization problems. It was found from extensive experiments that out evaluation method can increase the performance of genetic algorithms greatly. This evaluation method can be easily applied to the other types of genetic algorithms for improving their performance.