• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1998년도 가을 학술발표회 논문집
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• pp.497-504
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• 1998

In the nonlinear dynamic structural analysis, the given ground excitation as an input should be well defined. Because of the lack of recorded accelerograms in Korea, it is required to generate an artificial earthquake by a stochastic model of ground excitation with various dynamic properties rather than recorded accelerograms. It is well own that earthquake motions are generally non-stationary with time-varying intensity and frequency content. Many researchers have proposed non-stationary random process models. Yeh and Wen (1990) proposed a non-stationary stochastic process model which can be modeled as components with an intensity function, a frequency modulation function and a power spectral density function to describe such non-stationary characteristics. This model is based on the simulation for the strong-motion earthquakes with magnitude greater than approximately 5.0~6.0, because it will be not only expected to cause structural damage but also involved the characteristics of earthquake motions. Also, the recorded earthquake motion within this range are still very scarce in Korea. Thus, it is necessary to verify the model by the application of it to the mid-magnitude (approximately 4.0~6.0) earthquakes actually recorded in domestic or foreign area. The purpose of the paper is to generate an artificial earthquake using the model of Yeh and Wen in the area with low seismicity.

• 한국게임학회 논문지
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• 제14권1호
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• pp.19-28
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• 2014

본 논문에서는 서사의 핵심 자원인 NPC 및 다양한 월드 자원들을 가진 가상의 영속적 RPG 월드에서 NPC들이 창발적인 퀘스트를 지속적으로 생성할 수 있는지 실험을 통하여 검증하고자 한다. 이를 위해 가상의 RPG 월드 환경과 선행 연구들의 퀘스트 유형을 상정하여, NPC의 내적 욕구와 다른 자원의 발견 사건을 통해 퀘스트를 생성하는 실험을 하였다. NPC의 퀘스트 생성 의사결정은 욕구 충족정도, 재화 보유 그리고 상호 관계를 변수로 하였으며, 이들 변수는 퀘스트의 수행 결과에 따라 지속적으로 다음 퀘스트 생성에 영향을 주도록 하였다. 본 연구를 통하여 영속적 가상 월드에서 NPC자원들이 절차적 의사 결정 과정을 통하여 다양한 퀘스트를 지속적으로 양산할 수 있음을 보여주었다.

• 한국의류산업학회지
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• 제25권3호
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• pp.291-303
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• 2023

The purpose of this study is to investigate the impact of technical acceptance factors of Chinese MZ generation consumers' use of online fashion platforms on behavioral intentions and usage behavior, and to determine whether satisfaction plays an additional role in the relationship between behavioral intentions and usage behavior. The research results can be summarized as follows. First, among the technology acceptance factors that influence Generation MZ consumers when they use online fashion platforms, it was found that performance expectancy, effort expectancy, facilitating conditions, hedonic motivation, price value, habit, and content quality significantly influence the behavioral intention to use online fashion platforms. Second, the facilitating conditions and the platform usage intention of Chinese Generation MZ consumers directly and significantly influence the usage behavior on online fashion platforms. In contrast, it was confirmed that habit does not significantly influence actual usage behavior. Third, this study confirmed the moderating effect of satisfaction on the relationship between behavioral intention and usage behavior on online fashion platforms. This research, which proposes a research model explaining the usage intention and behavior of online fashion platforms based on UTAUT2, integrating not only the organizational aspect but also the consumer aspect to empirically verify the usage intention and the final usage behavior from the general consumer's perspective, has academic significance.

• Human Ecology Research
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• 제60권4호
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• pp.625-643
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• 2022

The purpose of this study was to explore the trends and core keywords of the secondary school home economics teacher selection test using content analysis and text network analysis. The sample comprised texts of the secondary school home economics teacher 1st selection test for the 2017-2022 school years. Determination of frequency of occurrence, generation of word clouds, centrality analysis, and topic modeling were performed using NetMiner 4.4. The key results were as follows. First, content analysis revealed that the number of questions and scores for each subject (field) has remained constant since 2020, unlike before 2020. In terms of subjects, most questions focused on 'theory of home economics education', and among the evaluation content elements, the highest percentage of questions asked was for 'home economics teaching·learning methods and practice'. Second, the network of the secondary school home economics teacher selection test covering the 2017-2022 school years has an extremely weak density. For the 2017-2019 school years, 'learning', 'evaluation', 'instruction', and 'method' appeared as important keywords, and 7 topics were extracted. For the 2020-2022 school years, 'evaluation', 'class', 'learning', 'cycle', and 'model' were influential keywords, and five topics were extracted. This study is meaningful in that it attempted a new research method combining content analysis and text network analysis and prepared basic data for the revision of the evaluation area and evaluation content elements of the secondary school home economics teacher selection test.

• 한국CDE학회논문집
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• 제13권2호
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• pp.77-88
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• 2008

Nowadays personal users create a variety of multi-media contents and share them with others through various devices over the Internet since the concept of user created content (UCC) has been widely accepted as a new paradigm in today's multi-media market, which has broken the boundary of contents providers and consumers. This paradigm shift has also introduced a new business model that makes it possible for them to create their own multi-media contents for commercial purpose. This paper proposes a tangible virtual studio using augmented reality to author multi-media contents easily and intuitively for personal broadcasting and personal content generation. It provides a set of tangible interfaces and devices such as visual markers, cameras, movable and rotatable arms carrying cameras, and miniaturized set. They can offer an easy-to-use interface in an immersive environment and an easy switching mechanism between tangible environment and virtual environment. This paper also discusses how to remove inconsistency between real objects and virtual objects during the AR-enabled visualization with a context-adaptable tracking method. The context-adaptable tracking method not only adjusts the locations of invisible markers by interpolating the locations of existing reference markers, but also removes a jumping effect of movable virtual objects when their references are changed from one marker to another.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 봄 학술발표회 논문집
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• pp.145-150
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• 1999

In the nonlinear dynamic structural analysis, the given ground excitation as an input should be well defined. Because of the lack of recorded accelerograms in Korea, it is required to generate an artificial earthquake by a stochastic model of ground excitation with various dynamic properties rather than recorded accelerograms. It is well known that earthquake motions are generally non-stationary with time-varying intensity and frequency content. Many researchers have proposed non-stationary random process models. Yeh and Wen (1990) proposed a non-stationary stochastic process model which can be modeled as components with an intensity function, a frequency modulation function and a power spectral density function to describe such non-stationary characteristics. This paper shows the process to generate nonstationary artificial earthquake ground motions considering target design response spectrum chosen by ATC14.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
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• pp.61-68
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• 1999

In the nonlinear dynamic structural analysis the given ground excitation as an input should be well defined. Because of the lack of recorded accelerograms in Korea it is required to generate an artificial earthquake by a stochastic model of ground excitation with various dynamic properties rather than recorded accelerograms. It is well known that earthquake motions are generally non-stationary with time-varying intensity and frequency content. Many researchers have proposed non-stationary random process models. Yeh and Wen (1990) proposed a non-stationary modulation function and a power spectral density function to describe such non-stationary characteristics. Satio and Wen(1994) proposed a non-stationary stochastic process model to generate earthquake ground motions which are compatible with design reponse spectrum at sites in Japan. this paper shows the process to modify power spectrum compatible with target design response spectrum for generating of nonstationary artificial earthquake ground motions. Target reponse spectrum is chosen by ATC14 to calibrate the response spectrum according to a give recurrence period.

• Journal of Electrochemical Science and Technology
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• 제14권1호
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• pp.38-50
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• 2023

Proton exchange membrane fuel cell (PEMFC) is a portable and clean power generation device. The structural arrangement of the flow field has a significant influence on the delivery efficiency of PEMFC. In this article, a new bionic flow channel is designed based on the inspiration of a spider shape. The branch channel width and branch corner are studied as the focus, and its simulation is carried out by the method of computational fluid dynamics (CFD). The results show that when channel width/rib width and corner of the branch are 1.5 and 130° , respectively, it is the best numerical combination and the cell comprehensive performance is excellent. The final model using this numerical combination is compared with the traditional flow channel model to verify the advancement of this scheme.

• Korean Chemical Engineering Research
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• 제50권5호
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• pp.850-859
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• 2012

목질계 바이오매스의 가스화 및 열분해 공정에서 탈휘발 과정은 매우 중요한 메커니즘 중의 하나이며, 공정 설계 시 반드시 반영되어야 한다. 바이오매스 입자의 탈휘발에 대한 많은 경험식이 존재하지만, 다양한 특성의 바이오매스를 특정 실험조건에서 도출한 경험식에 의존하기는 힘들다. 본 연구는 유동층 가스화 분위기에서의 바이오매스 단일 입자의 탈휘발 과정을 수학적 모델을 통하여 예측하였다. 모델은 다양한 형태의 입자를 구형태로 변환한 뒤, 입자 내부의 drying, shrinkage, heat generation을 고려하여 1차원으로 해석하였다. 또한 탈휘발 과정에 영향을 주는 입자의 크기, 반응온도, 초기 수분함량, 열전달 계수, 반응모델 등 다양한 변수에 대한 변화를 관찰하였다. 탈휘발 완료시간은 입자의 크기가 커질수록, 초기 수분함량이 높을수록 증가하였으며, 반응온도가 높을수록 선형적으로 감소하였다. 또한 외부 열전달 계수가 300 $W/m^2K$ 이상일 경우 큰 변화는 나타나지 않았지만, 입자의 크기가 작을수록 외부 열전달 계수의 영향은 크게 나타났다. 모델 예측값과 문헌의 실험값은 대체로 비슷한 경향을 나타내었으며, 오차 ${\pm}10%$ 이내로 근접하였다.

• 한국콘텐츠학회논문지
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• 제12권9호
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• pp.380-388
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• 2012

다양한 웹서비스 참여자들은 콘텐츠의 생산과 공유, 확산 과정에 참여하고 있다. 웹서비스 내 다양한 상호작용을 지원하는 시스템의 반응 역량을 기술적 상호작용성이라 하며, 이는 웹서비스 성공의 핵심요인으로 연구되고 있다. 본 연구는 기술적 상호작용성 구성요인인 사용자 통제성과 동시성, 반응성이 웹서비스 내의 콘텐츠 생산 효율성과 콘텐츠 품질 인식에 미치는 영향을 구조방정식 모형을 통해 탐색적으로 확인하였다. 연구결과 사용자 통제성과 동시성은 웹서비스 내 콘텐츠의 생산 효율성 인식에 긍정적인 영향을 주었으며, 대화적 피드백 역량인 반응성은 웹서비스 내에서 공유되는 콘텐츠의 품질 인식에 긍정적 영향을 주고 있음을 확인하였다. 또한 콘텐츠 생산 효율성 인식이 콘텐츠 품질 인식에 긍정적 영향을 주고 있음을 확인해, 사용자 통제성과 동시성의 품질인식에 대한 간접효과도 확인하였다. 본 연구는 웹서비스 개발 및 운영시 통제 가능한 요인인 기술적 상호작용성이 웹서비스를 통한 콘텐츠 생산 효율성 및 품질 인식에 긍정적인 영향을 주고 있음을 제시함으로써, 고객참여 콘텐츠가 중요한 웹서비스 개발자와 마케터에게 관련성과를 향상시킬 수 있는 웹 기술 활용 및 시스템 구축에 대한 함의를 제공해 주고 있다.