• Proceedings of the KSME Conference
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• 2004.11a
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• pp.1721-1726
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• 2004

Heat rate is a representative index to estimate the performance of turbine cycle in nuclear power plant. Accuracy of heat rate calculation is dependent on the accuracy of measurement for plant status variables. Uncertainty of heat rate can be modeled using uncertainty propagation model. We developed practical estimation model of heat rate uncertainty using the propagation and regression model. The uncertainty model is used in the performance analysis system developed for the operating nuclear power plant.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.539-541
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• 2007

유채유를 이용한 바이오디젤의 실질적인 가치는 배럴당 355,000원으로, 현재의 가격은 평가절하되어 있으며 에머지 생산비율(EYR)은 1.27으로서 석유의 8.4에 비하여 효율이 낮아 대체에너지로서의 경쟁력은 없으나 1보다 높아 에너지 소비 절감의 효과는 있다. 환경부하비율(ELR)은 2.46으로 수력발전의 3.3과 Bioethanol의 7.7보다 낮아 환경에 미치는 영향은 작은 것으로 나타났다. 에머지 지속가능성지수(ESI)는 0.52로 재생불가능한 에너지와 외부에서 구입한 재화와 용역에 대한 의존도가 높으므로 지속성이 낮은 것으로 나타났다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2002.05a
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• pp.109-114
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• 2002

건설공사의 공종 중 거푸집공사는 전체공사기간의 대략 25％를 차지하고 있으며 공사비 비율은 일반적으로 전체공사비의 10～15％, 철근콘크리트공사비의 20～30％를 차지하고 있어 구조물의 안전성, 경제성 및 작업성과 품질관리에 중요한 역할을 한다. 또한 거푸집은 콘크리트가 양생되면 곧 해체되는 가설구조물로써 작업상에서 많은 위험요소를 포함하고 있으며 특히, 아파트공사의 경우 전체 재해발생의 17％로 가장 높은 비율을 차지하고 있다. 이와 같이 거푸집공사는 가장 우선적으로 관리하여야 할 위험공종이며 전체공기를 좌우하는 주공정으로서 이를 재해발생의 측면에서 제어하는 것이 안전관리에 있어서 가장 효율적이며 큰 효과를 나타낼 수 있는 것으로 생각된다.(중략)

• 전기의세계
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• v.21 no.4
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• pp.45-47
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• 1972

최근까지의 관습적인 예측으로보면 인간의 동력사용은 앞으로 수십년에 걸쳐 현재와 같은 비율로 지수함수적으로 증가할 것이며 이로 인해 당연히 전세계의 한정된 화석연료자원이 급속히 고갈되지 않을까 하는 우려가 제기된다. 그러므로 인간의 실수요에 대해 타당한 예측을 하는것이 우선적 문제인데, 이것은 세계인구수와 1년 1인당의 예상수요의 산출로 분류할 수 있다. 인구수에 관해서는 다음과 같은 낙관적인 견해가 있다. 즉 인구는 2,000년까지 현재의 비율(년간 2%)로 계속 증가하여 현 3.5*$10^{9}$에서 6.6*$10^{9}$ 이 될 것이나, 21세기중에는 일정한 수에 머무를 것이다. 동력의 1인당 실수요 평가에 있어서는 여러가지 요인을 고려해야 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.76-78
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• 2003

다 개체군 유전자 알고리즘에서는 여러 개의 개체군을 사용하여 각 개체군을 독립적으로 진화를 시키는데, 이 논문에서는 퍼지 논리 제어를 이용하여 독립적으로 개체군을 진화시켜 집단으로 이주시키는 새로운 코딩방법을 제안한다. 이 퍼지 논리 제어는 최적화과정 동안 교배 비율과 돌연변이 비율을 적합하게 조절하여 수행하는 두 퍼지 논리 제어를 나타낸다. 제안하는 방식을 성능평가해서 기존의 방식과 비교해 보았다. 제안하는 방식이 수렴속도를 향상시킬 수 있다는 장점을 보여준다.

• Korea Real Estate Review
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• v.27 no.4
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• pp.63-76
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• 2017

The purpose of this study is to analyze the effect of the results of a nationwide academic evaluation of middle schools and high schools on apartment prices in Ulsan City by using a hedonic pricing model. The results of the middle school and high school achievement test, the College Scholastic Ability Test (CSAT) score for high school, the national united evaluation score, and the number of successful applicants to prestigious universities have a significant effect on the apartment price formation with a positive relationship. In addition, different kinds of academic evaluation score have asymmetric effects on apartment price determination. The results of the high school achievement evaluation are more important than the results of the middle school achievement evaluation in the apartment price determination. Among the achievement evaluation results, the ratio of the students with the higher education level is more important than the ratio of the students with the lower basic education level. Furthermore, the CSAT score for Natural Sciences is more important than the CSAT score for the Humanities course.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.249-258
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• 2019

Currently, people are paying more attention to smart home businesses. Therefore, the research on smart home system is becoming important. Smart Home App, which is an important component of smart home system, needs to consider the development of evaluation indicators for usability. In this regard, this paper takes smart home App as the object to develop the usability evaluation indicators of smart home App design. For this purpose, this study performed three rounds of survey by using the Delphi method. In the first round, 8 suitable areas were selected by collecting opinions from experts and analyzing the Content Validity Ratio, which was derived from literature review. Based on the results of the first survey, a total of 38 evaluation items were collected through prior research and user interview surveys. For the 38 collected evaluation items, 27 evaluation items have been selected by analyzing Average Value, Standard Deviation, Content Validity Ratio, Consultation and Convergence in the second and third rounds. The result of this study can be used as a guideline when evaluating the usability of smart home App design.

• Korean Journal of Environment and Ecology
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• v.37 no.6
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• pp.484-498
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• 2023

This study aimed to analyze the appropriateness of the criteria and methods of the feasibility study for national park re-planning. The rate of 'release area' was derived at a lower rate in the absolute evaluation (the second) than the relative evaluation(the third) Seoraksan and Juwangsan National Parks as well as Gayasan National Park. Despite the third evaluation method aiming to maintain park area through retention by setting the areas available for release as 10% rather than applying release, it was found that the absolute evaluation method did not derive more areas available for release. When the second and third ecology-based assessments were applied to study sites, both second and third ecological-based assessments showed that the actual release areas were not reflected in the extraction in 2011. Consequently, it was found that the ecological-based assessment was only a means of assistance instead of a means of critical decision-making for determining the release area. From the district adjustment of the park planning easibility study, it can be determined that interactive exchange and priority application of release criteria as external factors acted more significantly.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.4
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• pp.361-371
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• 2015

This study analyzed the 91 cases of the statements for the Sea Area Utilization Consultation according to the developmental projects of ports and fishery harbors for 2012 2014 and the status of the record of document, and suggested the improvement way to go. The marine environmental timpact assessment items both marine chemistry such as water quality, sediment and marine biology such as benthic animal, plankton, and fisheries show highly rate of site survey. But, the utilization of those data through site survey is too low, and it is necessary to adopt the QA/QC for the reliability of survey data. The items of marine physics such as tide, tidal current analyzed based on references not a site survey. However, the simulation performed actively without calibration and verification compared to the result of site survey. When the projects of port and fishery harbor perform, it is necessary to monitor the physical parameter such as wave, tide and tidal current especially. Based on the scale and the type of project, we need introduce the system of scoping for prediagnosis the key assessment items and checklists.

• Journal of Science Education
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• v.38 no.3
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• pp.670-690
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• 2014

The purpose of this study was to analyze paper and pencil test items of life science I in high school to diagnose problems of the test items developed by teachers, and to provide some implication for better assessment. 690 selection-type items and 162 supply-type items in life science I were collected from 10 general high schools. In the analysis of test items, the ratio of the selection-type item and the supply-type item was 81:19 in the number of items based on item type, while the ratio was 74.4:25.6 in the distribution of marks, indicating that the distribution of marks compared to the number of items was higher in the supply-type items. In the analysis by the Bloom's revised taxonomy of educational objectives, the items of 'conceptual knowledge' in the knowledge and those of 'understanding' in the cognition process were shown most in both the selection-type item and the supply-type item. In the analysis by the science assessment frameworks of NAEA, the items of 'knowledge' were shown 9 times more than those of 'inquiry'. When compared to the level of difficulty presented in the two-way specification table and the percentage of correct answers in the selection-type item, the concurrence was 41.5%. When compared to the ratio of number of items based on the item type of the supply-type items, the short-answer items were 34.0%, the descriptive items were 61.1%, and the drawing items were 4.9%. The drawing items were mainly developed in the unit of 'Cells and Continuity of Life'. When the descriptive items were classified by the acceptance of response, all the items were 'response restricted' type, and the items of 'restricted in content range' type among them were highest. When the items were classified by presentation of data, the items of 'presentation of data' type were highest(65.4%), and when classified by type of question, the items of 'knowledge description' type were highest(80.4%). In conclusion, it is needed to develop items belonging to 'inquiry' area more in the school, and to increase the ratio of the descriptive items, presenting various types of items.