• Nuclear Engineering and Technology
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• 제55권7호
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• pp.2407-2418
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• 2023

Internal replaceable electronic module substitutions can impact EMC (ElectroMagnetic Compatibility) qualification testing and results if EMC testing is conducted at the cabinet level. The impact of component substitutions on EMC qualification results therefore should be evaluated. If a qualitative evaluation is not adequate to ensure that the modified product will not impact the cabinet level EMC qualification results, a new qualification testing should be conducted. Component level retesting should be conducted under electromagnetically equivalent conditions with the cabinet level test. This paper analyzes the propagation of conducted susceptibility test waveforms in a representative cabinet and evaluates the impact of component substitutions on cabinet level EMC qualification results according to the location of the replacement items. A guideline for a qualitative evaluation of the impact of component substitutions is described based on the propagation of the conducted susceptibility test waveforms. A module level test method is also described based on an analysis of the shielding effectiveness of the cabinet.

• Journal of Electrical Engineering and Technology
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• 제11권6호
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• pp.1610-1613
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• 2016

An analytical method for harmonic estimation of magnetization currents has been developed. The method is based on the results of the waveforms qualitative analysis. The calculation and the experimental results are compared. A good matching is observed.

• 한국식품영양학회지
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• 제22권4호
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• pp.696-700
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• 2009

대장균군 및 대장균의 정성실험에 건조필름을 이용할 수 있는지를 평가하였다. 대장균군의 정성실험에 있어서 lactose broth 배양법의 경우는 검출율이 가장 높은데 반하여 비교적 선택성이 낮고, 검출에 48시간이 소요되며, 실험 시마다 배지를 제조하여야 하는 등 번거로운 조작을 필요로 하였다. Desoxycholate lactose agar 평판배양법의 경우는 검출율이 건조필름보다 다소 높지만 유의적인 차이를 보이지 않는 정도이며, 실험시마다 배지를 제조하여 적당한 온도로 식혀서 분주하여야 하는 등 번거로운 조작을 필요로 하였다. 반면에 건조필름을 사용 할 경우는 검출율이 다소 낮지만 시료액의 균체농도가 1 cfu/$m{\ell}$ 이상에서는 E. coli KCCM11234의 경우 34.3%, E. aerogenes KCCM12177의 경우 67.4%, K. pneumoniae subsp. pneumoniae KCCM40890의 경우 58.3%의 검출율을 보이므로, 최대 3개의 배지에 접종하여 실험할 경우 시료 중에 대장균군의 존재 여부를 확인할 수 있는 수준이며, 선택성이 높고, 별다른 준비나 조작을 필요로 하지 않으므로 쉽게 대장균군을 검출하는데 사용할 수 있었다. 대장균의 정성실험에 있어서 EC broth 배양법은 검출율은 높으나 선택성이 떨어지며 실험조작이 번거로운 반면 건조필름법은 검출율이 다소 낮다. 시료액의 균체농도가 1 cfu/$m{\ell}$이상에서는 37.1%의 검출율을 보이므로 3개의 배지에 접종하여 실험할 경우 시료 중에 대장균의 존재 여부를 확인할 수 있는 수준이며, 선택성이 높고, 별다른 준비나 조작을 필요로 하지 않으므로 쉽게 대장균을 검출하는데 사용할 수 있었다. 단지 건조필름법은 균주에 대한 선택성이 높아서 손상된 균체의 검출이 어려웠으며 손상된 균체가 증식하는데 보다 많은 시간이 소요되므로 정확한 실험을 위해서는 대략 36시간 정도의 배양이 필요하였다. 전반적인 상황으로 판단해 볼 때 건조필름은 대장균군 및 대장균의 정성실험을 행하는데 있어서 현장에서도 손쉽게 실시할 수 있는 방법으로 기존의 방법을 대체하여 사용될 수 있을 것으로 판단되었다.

• 대한방사선기술학회지:방사선기술과학
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• 제44권5호
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• pp.443-449
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• 2021

In this study, the purpose is to present the foot inclination angle for realizing an image similar to that of the existing examination method and to present the clinical usefulness of the new examination method through comparison between the existing examination method and the newly designed standing foot oblique projection. A foot phantom was used, and the magnification of the image according to the angle was quantitatively evaluated by attaching a nut to the position of the cuboid of the phantom. The internal oblique image acquired using a 30° wedge was set as the standard image. And that image was compared with the images acquired by changing the angle of the foot from 20° to 65° at intervals of 5°. Image evaluation was performed by 3 radiological technologists, and qualitative evaluation using a Likert 5-point scale for evaluation items of true oblique view and quantitative evaluation of the value obtained by measuring the diameter of a nut in each image were performed as image evaluation. For data analysis, reliability analysis between the measure and comparative analysis of the average value for each angle were performed. The qualitative evaluation score for each image was 4.5 to 5 points for most questions in the case of the standard image. And 4 points or less for most questions in the images with a foot angle of 45° or less, and an evaluation score close to the standard image was obtained in the image of 50° or more. And in the quantitative evaluation, the diameter of the nut was measured to be 9.28~9.56 mm. The qualitative evaluation showed a reliability of 0.95~1.0 and the quantitative evaluation was 0.62. As a result of comparing and analyzing the average of the quantitative and qualitative average values for each angle image, the group with the average value most similar to the standard image was images obtained at 55° and 60°, and in the post-analysis, the images of both groups were the same group as the standard image(p<0.01). As a result of this study, it was found that the angle of inclination of the foot for realizing the image most similar to the existing image in the standing foot oblique projection is 55°~60°. In addition, if this test method is applied to the clinic, it is believed that it will help prevent safety accidents such as falls during the test and improve test efficiency by minimizing the movement of patients for the test.

• 분석과학
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• 제27권3호
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• pp.153-160
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• 2014

세계적으로 석면분석방법에 관한 다양한 연구사례가 발표되고 있는 가운데, 분석방법의 차이에 따른 석면함유물질(ACM, Asbestos Containing Material) 결과에 대한 관심이 대두되고 있다. 본 연구에서는 균질성이 확보된 ACM 시료를 시야평가법(visual estimation method)과 포인트계수법(point counting method)의 분석결과에 대한 비교 평가를 통하여 분석기관 및 분석자의 신뢰성 향상과 더불어 편광현미경 분석의 기초자료를 확보고자 하였다. 석면분석은 정성분석과 정량분석으로 구분하였으며, 석면정량을 위한 방법은 EPA 600-R-93-116의 시야평가법과 포인트계수법으로 총 400지점을 계수하는 방법으로 실시하였다. 먼저 준비된 시료의 균질성을 분산분석을 이용하여 확인한 결과 이상이 없음을 확인하였다. 정성분석의 결과는 백석면과 갈석면으로 확인되었고 정량분석결과는 포인트계수법이 시야평가법과 비교하여 전체적인 석면함유량이 저평가되는 경향과 함께 포인트계수법은 분석과정이 조금 복잡하고 분석시간이 많이 소요되었다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2001년도 추계학술발표회요약집
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• pp.80.1-80
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• 2001

• 제어로봇시스템학회논문지
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• 제10권5호
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• pp.450-457
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• 2004

In this research, the automatic synthesis of knowledge models is proposed. which are the basis of the methods using qualitative models adapted widely in fault diagnosis and hazard evaluation of chemical processes. To provide an easy and fast way to construct accurate causal model of the target process, the Role-Behavior modeling method is developed to represent the knowledge of modularized process units. In this modeling method, Fault-Behavior model and Structure-Role model present the relationship of the internal behaviors and faults in the process units and the relationship between process units respectively. Through the multiple modeling techniques, the knowledge is separated into what is independent of process and dependent on process to provide the extensibility and portability in model building, and possibility in the automatic synthesis. By taking advantage of the Role-Behavior Model, an algorithm is proposed to synthesize the plant-wide causal model, Fault-Causality Graph (FCG) from specific Fault-Behavior models of the each unit process, which are derived from generic Fault-Behavior models and Structure-Role model. To validate the proposed modeling method and algorithm, a system for building FCG model is developed on G2, an expert system development tool. Case study such as CSTR with recycle using the developed system showed that the proposed method and algorithm were remarkably effective in synthesizing the causal knowledge models for diagnosis of chemical processes.

• The Journal of Asian Finance, Economics and Business
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• 제7권5호
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• pp.269-278
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• 2020

The purpose of this study is to explore the relationship between employee's psychological capital, organizational commitment and job performance in Vietnam. In this study, psychological capital and overall organizational commitment are considered as two second-order constructs. Psychological capital includes four different components: self-efficacy, optimism, hope and resiliency. Organizational commitment comprises three different components: affective commitment, continuance commitment and normative commitment. The study uses the combination of quantitative research method and qualitative research method. Qualitative research method (based on the experts' opinions) is used to design the official questionnaire, while relationship between concepts is estimated by quantitative research method, which is inclusive of the methods of descriptive statistics, Cronbach's Alpha, EFA, CFA and CB-SEM. The survey is conducted in two ways: face-to-face and via email. Data are collected from 848 employees across provinces and cities in Vietnam. The findings show that psychological capital and job performance have a positive relationship, organizational commitment has positive influence on job performance, and psychological capital is also related to organizational commitment. All relationship between psychological capital, organizational commitment and job performance of employee are statistically significant. In addition, organizational commitment also plays the mediating role in the positive relationship between psychological capital and employee's performance.

• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.77-85
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• 2022

Today's universities have a keen interest in educational reform. The issue of population decline in college-age due to population decline is not new. Universities have been developing quantitatively for a long time and are now considering ways to survive rather than qualitative growth. Since the sharp decline in the school-age population due to the population decline has no clear solution immediately, universities are overcoming this crisis by creating many alternatives. Attracting international students is one of them. In this study, the effectiveness of photovoice was examined through the analysis of the case of the Korean-Japanese convergence cartoon class. The photo-voice method has sufficient potential as a teaching method for foreign convergence classes and can be expected to play a role as a teaching method suitable for students participating in convergence classes with different social, cultural, and linguistic backgrounds. In particular, in the convergence class, since participating students generate research materials through photo production, it can be a tool for inner exploration necessary for webtoon production and a tool for narrative inquiry for storytelling. It is expected that expanding the understanding and use of photo voice will have the methodological value of convergence classes. In addition, the teaching method using photo voice produced in the composition of photos and stories is likely to be used as an appropriate tool for convergence classes for students with different social, cultural, and linguistic backgrounds.

• Journal of Forest and Environmental Science
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• 제36권1호
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• pp.47-54
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• 2020

A "Scenic Site" is an official heritage category legally defined as a "scenic site of outstanding artistic value with excellent scenic views." However, the subjective interpretation of the term causes several problems. This study suggested a systematic, organized process of designating a listed area as a scenic site after careful and detailed quantitative and qualitative analysis. Indicators were identified for each of the two analyses, and then scored and weighted. Quantitative indicators were distributed within 5 points for each indicator. Water, which is a natural indicator, based on distance from river boundaries. Forest landscapes were assigned in consideration of forest physiognomy and age class. Land use was allocated in consideration of land cover type and, in case of development site, '-' score was assigned. Cultural heritage conservation area, which is historical and cultural indicator, was distributed by distance within a maximum of 500 meters. Visibility, an indicator of landscape value, was assigned according to the frequency of visibility. The weight of each indicator was calculated by considering the value of each item. The weight of distribution of cultural resources is relatively high, while other items were set the same. In case of land use, however, '-' score was given according to the grade. Qualitative indicators, on the other hand, were considered terrain, landscape zone, ownership, intellectual boundary, and land category. The applicability of the proposed process and method was examined by applying the existing methods and criteria used for designating scenic spots. Opinions of subject-matter experts were incorporated in the identification of the indicators and in the result review stage. In the future, it is necessary to apply this method while designating scenic sites so as to establish an objective, scientific designation process.