• Imaging Science in Dentistry
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• 제47권3호
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• pp.199-207
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• 2017

Purpose: Evaluation of alveolar bone is important in the diagnosis of dental diseases. The periodontal ligament space is difficult to clearly depict in cone-beam computed tomography images because the reconstruction filter conditions during image processing cause image blurring, resulting in decreased spatial resolution. We examined different reconstruction filters to assess their ability to improve spatial resolution and allow for a clearer visualization of the periodontal ligament space. Materials and Methods: Cone-beam computed tomography projections of 2 skull phantoms were reconstructed using 6 reconstruction conditions and then compared using the Thurstone paired comparison method. Physical evaluations, including the modulation transfer function and the Wiener spectrum, as well as an assessment of space visibility, were undertaken using experimental phantoms. Results: Image reconstruction using a modified Shepp-Logan filter resulted in better sensory, physical, and quantitative evaluations. The reconstruction conditions substantially improved the spatial resolution and visualization of the periodontal ligament space. The difference in sensitivity was obtained by altering the reconstruction filter. Conclusion: Modifying the characteristics of a reconstruction filter can generate significant improvement in assessments of the periodontal ligament space. A high-frequency enhancement filter improves the visualization of thin structures and will be useful when accurate assessment of the periodontal ligament space is necessary.

• 환경영향평가
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• 제9권4호
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• pp.277-290
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• 2000

The purpose of this study is to identify the problems of environmental impact assessment(EIA) and to suggest new EIA technology. The problems of EIA in Korea can be summarized as follows. First, the EIA does not reflect the impact of policy, plan and program on environment. Second, the project EIA does not consider the cumulative impacts such as additive impacts, synergistic impacts, threshold/saturation impacts, induced and indirect impacts, time-crowded impacts, and space-crowded impacts. Third, the EIA techniques in Korea are not standardized. Finally, the present EIA suggests only alternatives to reduce adverse impacts. To solve above-mentioned problems, the development of new EIA technology is essential. First, the new EIA technology should be developed toward pollution prevention technology and comprehensive and integrated environmental management technology. Second, new fields of EIA for pollution prevention contain strategic environmental assessment, cumulative impacts assessment, socio-economic impact assessment, cyber EIA and EIA technology necessary after the reunification of Korean Peninsula. Third, EIA technology for integrated environmental management contains the development of integated environment assessment system and the development of packaged EIA technology. The EIA technology for integrated environmental assessment system contains (1) development of integrated impact assessment technology combining air/water quality model, GIS and remote sensing, (2) integrated impact assessment of EIA, traffic impact assessment, population impact assessment and disaster impact assessment. (3) development of integrated technology combining risk assessment and EIA (4) development of integrated technology of life cycle assessment and EIA, (5) development of integrated technology of spatial planning and EIA, (6) EIA technology for biodiversity towards sustainable development, (7) mathematical model and GIS based location decision techniques, and (8) environmental monitoring and audit. Furthermore, there are some fields which need packaged EIA technology. In case of dam development, urban or industrial complex development, tourist development, landfill or combustion facilities construction, electric power plant development, development of port, road/rail/air port, is necessary the standardized and packaged EIA technology which considers the common characteristics of the same kind of development project.

• 한국안전학회지
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• 제22권4호
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• pp.1-6
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• 2007

In this study, we provided an index for the quantitative and systematic performance based fire risk assessment. A complex cinema was adopted for the fire scenario and the fire simulation was carried out by using FDS. Also evacuation time was calculated by using SIMULEX. We obtained a big different fire risk assessment result by the focus on the between space basis and the time basis. As a result of this study, performance based fire risk assessment should be performed on the basis of individual evacuee's path line.

• KIEAE Journal
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• 제14권4호
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• pp.11-18
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• 2014

Although assessing outdoor environment and green space in terms of sustainability and environmental performance is perceived as an important issue, most existing green building certification systems are more focused on buildings and indoor environment. Recently, the Sustainable Site Initiatives (SITES) has been developed by American Society of Landscape Architecture in order to evaluate sustainability of site development and outdoor environment. Separate from LEED, the SITES are increasingly receiving attentions as a reliable certification system in the United States. As a preliminary study to develop the items of outdoor environmental assessment, the present study is purposed to analyze the assessment items, grading system and applicability of SITES for better understanding on the system. Also it was compared to existing green building certification criteria, including G-SEED, LEED-NC, and LEED-ND in order to investigate similarities and discrepancies. The results would provide insights and basic data to improve assessment items for outdoor environment of G-SEED.

• 대한안전경영과학회지
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• 제14권3호
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• pp.151-158
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• 2012

The objective of this paper is to propose a method of how to perform risk assessment in the early stage of defense research and development for the acquisition of weapon systems. An advanced method for risk assessment and its associated objective functions are developed first based on the concept of systems engineering. The developed method is then applied to carry out the analysis of alternatives in the trade-off environments. As a case study, the multi-purpose training ship is considered, where it is performed using the notions of technology readiness levels, degrees of difficulty, and technology need values to facilitate design space visualization and decision maker interaction. It is noted that decision makers can benefit from our approach as an improved risk assessment method in the context of multi-criteria decision making.

• Nuclear Engineering and Technology
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• 제43권1호
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• pp.45-62
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• 2011

The Korean nuclear industry is developing a thermal-hydraulic analysis code for safety analysis of pressurized water reactors (PWRs). The new code is called the Safety and Performance Analysis Code for Nuclear Power Plants (SPACE). The SPACE code adopts advanced physical modeling of two-phase flows, mainly two-fluid three-field models which comprise gas, continuous liquid, and droplet fields and has the capability to simulate 3D effects by the use of structured and/or nonstructured meshes. The programming language for the SPACE code is C++ for object-oriented code architecture. The SPACE code will replace outdated vendor supplied codes and will be used for the safety analysis of operating PWRs and the design of advanced reactors. This paper describes the overall features of the SPACE code and shows the code assessment results for several conceptual and separate effect test problems.

• 한국실내디자인학회논문집
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• 제23권5호
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• pp.112-121
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• 2014

The purpose of this study is to develop the user-oriented housing interior space sensibility evaluation tools: The user-oriented housing interior space sensibility evaluation tools shall be developed through the systematic selection process of the extracted housing interior space images, which were linked with the adjectives of sensibility evaluation selected for the housing interior space preferred by the user from the specific words of the sensibility extracted to identify the characteristics of the user's sensibility which is recently being changed. In the results of analyzing the words of sensibility for the residential space preferred by the users with 48 pairs of adjectives. The user-oriented sensibility assessment tool was built by extracting 8 sensibility factors of 'cozy', 'practical' 'cheerful', 'traditional', 'unique', 'congenial', 'sensuous', and 'gorgeous' in the exploratory factor analysis. The image scale was constructed in two-dimensions of the sense of space and the type of space for the residential interior space images. The dimension of the 'sense of space' is explained by the axis of open-closed and the dimension of 'type of space, is explained by the axis of 'natural-artificial'. Such a structural model of the residential interior design attributes were divided into 8 groups. And the 42 images representing each group were selected and the user-oriented residential interior space image tool was built by adding user's selective elements.

• 한국산학기술학회논문지
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• 제16권11호
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• pp.8021-8029
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• 2015

본 논문은 공공공간의 개선 방안을 위하여 고려되어야 하는 평가 지표를 도출하고 공무원/학계 및 실무자 측면에서 중요도를 비료/분석하고자 하였다. 이를 위하여 공공공간의 특성에 따른 계획항목을 선행연구를 바탕으로 도출하고, 세부지표들을 선별 후 전문가그룹인터뷰(FGI : Focus Group Interview)를 통하여 도출과정의 적합성과 도출된 항목들에 대한 부적합 여부를 논의하고, 합의된 항목만을 선정하였다. 선정된 지표는 전문가 설문을 통한 계층적 의사결정법(AHP : Analytic Hierachy Process)을 실시하여 중요도를 분석하고 종합순위를 도출하였다. 연구 결과, 공공공간의 중요도는 실무 전문가의 경우 사용성, 공공성, 환경성, 연계성, 정체성, 공간성 순으로 나타났으며, 공무원/학계는 사용성, 환경성, 연계성, 정체성, 공간성, 공공성 순으로 나타났다. 또한 종합분석 결과 우선순위에서 실무 전문가는 안전성을 가장 중요한 요소로 인식했으며, 공무원/학계는 청결성이 가장 중요한 요소로 나타났다. 본 연구에서 도출된 결과는 향후 공공공간의 개선 방안을 위한 계획적인 고려사항 및 평가로 활용될 수 있는 지표로 활용될 수 있을 것이며, 공공공간의 디자인가이드 라인으로 제시될 수 있다.

• 한국지리정보학회지
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• 제17권2호
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• pp.15-31
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• 2014

본 연구에서는 도시공간의 녹지환경에 대한 통합적 평가를 통해 지속가능한 녹지계획의 방향을 설정하고자 하였다. 연구대상지는 대구광역시의 7개 행정구 중 녹지의 공간적 불균형이 가장 심화된 지역인 달서구를 선정하였다. 녹지환경 평가를 위한 세 가지 기능은 자연생태적, 환경조절적, 이용적 기능으로 설정하였다. 자연생태적 기능의 평가에서는 '녹지연결성'과 '동물이동성'을 지표로 활용하였으며, 환경조절적 기능 평가에서는 '열환경'과 '기온저감기능', 이용적 기능 평가에서는 '녹지의 서비스공급량'을 지표로 이용하였다. 분석결과를 살펴보면, I등급 지역인 녹지환경 우수지역은 달서구 전체면적의 44.8%를 점하며, 대부분 남동쪽의 앞산과 비슬산, 북쪽의 궁산과 와룡산의 산림녹지를 따라 분포하는 것으로 평가되었다. 반면, IV등급 지역인 녹지환경 단절지역은 감삼동과 죽전동의 주거지역, 월성1동과 진천동의 주거 및 공업지역 등으로 나타났으며, 전체면적의 5.5%를 점하는 것으로 평가되었다. 이상의 분석결과들은 향후 도시기본계획 수립 시 녹지 조성 및 배치를 위한 계획기준으로 활용될 수 있을 것으로 판단된다.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2001년도 춘계학술대회 논문집
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• pp.68-73
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• 2001

The word "cyber-space" was coined through the developments in communication technology and computers. It became possible to experience disembodied space in practice through a new kind of medium. this research aims to clarify the kansei stimulation elements as realistic sensed by users who use 3-dimensional expressions in cyber-space. The research was carried out by preparing 25 samples of computer graphics, and administering 3 questionnaires to 12 examinees. The Principal Ingredient Analysis method was used for its analysis and assessment. As a result of this research, it can be concluded that materials, reflection and shadow have the strongest effect on human beings' senses in cyber-space.