• Science of Emotion and Sensibility
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• v.7 no.2
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• pp.107-121
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• 2004

Although consumer needs for better products force manufactures to put emphasis on design, often development of a product has been done without the formal phase to consider human needs. In order to identify the implicit needs of customers and the areas of potential demand on a product, several analysis scheme such as QFD(quality function deployment) has been developed. For this, first of all, the methods for evaluating consumers satisfaction about their needs must be determined. However there were only few systematic methods on shoe design. In this paper we developed an innovative framework for human satisfaction evaluation of shoes. As a result, we uncovered 29 dominant human satisfaction dimensions for customer-oriented quality evaluation of a comfortable shoes. Here, 29 satisfaction dimensions were identified as the dimensions that represent the human sensitivity and psychological feeling on comfortable shoes. This study helped the designers and developers clarify the conceptual and abstract aspect of the design evaluation by proposing a more systematic and process-oriented method.

• Journal of Broadcast Engineering
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• v.24 no.3
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• pp.515-526
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• 2019

In the real world, the user's preference for a particular product is determined by many factors besides the quality of the product. The reflection of these external factors was very difficult because of various fundamental problems including lack of data. However, access to external factors has become easier as the infrastructure for public data is opened and the availability of evaluation platforms with diverse and vast amounts of data. In accordance with these changes, this paper proposes a recommendation system structure that can reflect the collectable factors that affect user's preference, and we try to observe the influence of actual influencing factors on preference by applying case. The structure of the proposed system can be divided into a process of selecting and extracting influencing factors, a process of supplementing insufficient data using sentence analysis, and finally a process of combining and merging user's evaluation data and influencing factors. We also propose a validation process that can determine the appropriateness of the setting of the structural variables such as the selection of the influence factors through comparison between the result group of the proposed system and the actual user preference group.

• Journal of the Korea institute for structural maintenance and inspection
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• v.9 no.2
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• pp.217-224
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• 2005

A methodology of selecting an optimal model is proposed for applying a frequency-domain SI method effectively. Instead of using a reduced finite element model, a reasonably detail finite element model is established first and then the model is identified. To satisfy the identifiability criterion, a parameter grouping scheme is applied to control the number of unknowns. Among the simulated member grouping cases, an optimal model is selected as the one with the minimal statistical error. The proposed approach has been examined through simulation studies on a single span box-girder bridge.

• Journal of the Korea Society of Computer and Information
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• v.3 no.2
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• pp.45-55
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• 1998

The purpose of our study is to develop a prototype groupware environment that addresses the different phases of meetings as well as to provide for customizable meetings. We describe several components that can be used to support the entire life-cycle of a distributed meeting. Our design is based on the premise that meetings are comprised of three stages: pre-meeting setup, during meeting activities, and post-meeting teardown. Additionally, meetings are individual, each requiring a different set of tools and applications. Our protype contains six components to support these stages. These components are electronic mail, bulletin board, organizer, agendas, virtual meeting room, and storyboard viewer.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.4A
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• pp.693-700
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• 2006

To detect and evaluate the damage present in bridge, static identification method is known to be simple and effective, compared to dynamic method. In this study, the damage detection method in steel box girder bridge using static responses including displacement, slope and curvature is examined. The static displacement is calculated using finite element analysis and the slope and curvature are determined from the displacement using central difference method. The location of damage is detected using the absolute differences of these responses in intact and damaged bridge. Steel box girder bridge with corner crack is modeled using singular element in finite element method. The results show that these responses were significantly useful in detecting and predicting the location of damage present in bridge.

• Journal of The Korean Association For Science Education
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• v.32 no.4
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• pp.555-569
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• 2012

Many science education research and practices are recently emphasizing the importance of collaborative learning. This study also understands learning in aspects of socio-cultural context, and regarded the creation of meaning in a same-age group as an important learning process. This is most especially true in the premise that the formation of roles in a collaborative learning is important for successful interactive learning. This study aims to find out how roles form in a group. For this purpose, university students participating in a group discussion activity about energy flow and circulation of material were selected as research participants. Discussions among the nine students in one group consisted of cognitive conversations on the topic and operational conversations for preparing a presentation. Video-clips of the discussions were made and transcribed. For the analysis, we developed a framework that includes four interaction functions (cognitive, organizational, meta-cognitive, operational), four action elements (question, simple answer, providing opinion, response to opinion), and two to four intention elements by each action elements. As a result, a total of nine roles were revealed through the interaction function and element; cognitive questioner, operational questioner, simple answerer, operational suggester, organizational commander, operational commander, cognitive explainer, terminator, reflective thinker. These roles are re-classified into seven utterance patterns by the utterance order and object, and they were categorized into three role groups (facilitating interaction, sustaining interaction, finishing interaction). The result means that role formation and function can have influence on learning and interaction. This study is meaningful to the suggestion to collaborative learning including project-based learning, investigation, club activity, and for the re-illumination of the role in an aspect of the interaction.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.235-236
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• 2012

HVDC시스템에서 시스템을 보호하기 위한 여러 가지의 보호요소 중 밸브그룹 즉 싸이리스터를 보호하는 요소 중의 하나를 시뮬레이션 해보았다. 변압기 2차측 혹은 DC송전선로에 사고가 발생하였을 때 신속히 동작하여 과전류나 과전압으로부터 밸브를 보호하는데 그 목적이 있다 하겠다. 방법은 밸브의 앞단(변압기 2차측)과 밸브의 뒷단(DC 송전선로 측 전류)를 측정하여 그 차이가 일정치 이상으로 커졌을 때 동작하며, 그 크기와 동작시간은 서로 반비례 관계를 가진다. 이러한 사고를 PSCAD를 이용하여 시뮬레이션 해보았다.

• Journal of the Korea Computer Industry Society
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• v.3 no.9
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• pp.1235-1244
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• 2002

This paper proposes a group key management protocol for a secure of all the multicast user in PIM-SM multicast group communication. With prosed architect, subgroups for multicast secure group management will be divided by RP (Rendezvous-Point) unit and each RP has a subgroup manager. Each subgroup manager gives a secure key to it's own transmitter md the transmitter compress the data with it's own secure key from the subgroup manager. Before the transmitter send the data to receiver, the transmitter prepare to encrypt a user's service by sending a encryption key to the receiver though the secure channel, after choking the user's validity through the secure channel. As the transmitter sending a data after then, the architecture is designed that the receiver will decode the received data with the transmitter's group key. As a result, the transmitting time is shortened because there is no need to data translation by group key on data sending and the data transmition is possible without new key distribution at path change to SPT (Shortest Path Tree) of the router characteristic. Additionally, the whole architecture size is samller than the other multicast secure architecture by using the conventional PIM-SIM routing structure without any additional equipment.

• Review of KIISC
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• v.28 no.4
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• pp.29-33
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• 2018

대칭키 암호기술은 고도화된 국방, 산업, 금융보안에 핵심적인 요소이다. 그리고 이에 대한 대한민국 표준기술의 국제표준화는 그 규모가 날로 커지는 IT 산업, 금융 시장을 한국이 선도하는데 큰 도움이 된다. 본 논문에서는 국제표준화기구/국제전기표준화위원회 합동기술위원회 1/연구그룹 27 작업그룹 2(ISO/IEC JTC 1/SC 27 WG2)에서 진행되고 있는 대칭키 암호기술의 표준화 동향을 살펴본다.

• Proceedings of the Korea Society for Simulation Conference
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• 2002.05a
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• pp.89-94
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• 2002

무선 네트워크의 폭발적인 증가와 함께 이동 통신 기기의 발전은 기존의 유선 일변도의 사용방식을 무선환경으로 급속히 확장, 이전시키고 있다. 무선 환경의 발전에 따라 모바일 데이터베이스 사용의 필요성은 급격히 증대되고 있으며 이에 따른 많은 문제점도 발생하고 있다. 이러한 문제점을 해결하기 위해서 제안된 모바일 데이터베이스 관리 시스템의 효율성 측정과 그룹화를 위한 기초 자료 획득을 목적으로 시뮬레이션을 실시한다. 시뮬레이션의 도메인이 되는 시스템의 4가지 기본 환경을 분석하여 비교 요소를 획득하고 각 환경에서의 결과를 구현된 모바일 그룹핑 서버에 적응 시켜서 시뮬레이션 결과를 구현물의 입력자료로 사용하는 통합 시스템을 구축하였다.