• Transactions on Control, Automation and Systems Engineering
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• 제3권1호
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• pp.1-9
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• 2001

The promise of improved productivity and quality has lead to numerous research investigations in machining process monitoring and control. Recent studies have demonstrated that careful attention must be paid to the regulation of multiple process modules within a single operation such that each module performs its function properly and adverse interactions between modules do not occur. This had lead to the development of supervisory control; particularly to the development of methodologies to systemati-cally construct and implement these controllers. However, no research study has investigated the effect of the production environ-ment on the design of supervisor controllers. In this paper, the design of supervisory controllers for various production environ-ment is studied. The design approach given in Landers and Ulsoy(1998) is applied to construct two supervisory machining control-lers that are experimentally implemented in a face milling operation. Comparisons with an experimental implementation without process control illustrate the benefits of utilizing process controllers that are coordinated properly. The results also show that the given design approach may be used to construct supervisory controllers for different types of production environments.

• 국제학술발표논문집
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• The 8th International Conference on Construction Engineering and Project Management
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• pp.117-121
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• 2020

Many of hotel customers obtain information from hotel websites to find the best alternative. One of the crucial information for the choice is spatial/visual information of hotel rooms. However, hotel website provides photographs only showing representative room features that may not be sufficient to give a full understanding of hotel room to customers. HMD-based 3D virtual environments (HVE) created by 3D camera could improve customers' experiences of hotel rooms by providing full virtual tours of hotel rooms. However, to the best of our knowledge, whether HVE can adequately provide similar customers' perception on spatial/visual information remains unproven as physical hotel rooms. The present study thus aims to verify how similar and reliable information on physical hotel room HVE provides to hotel customers in comparison with hotel website with 2D photograph and display-based 3D virtual environment. For this purpose, this study conducted a comparative experiment to investigate perception of three environments. As a result, the study found that HVE is more effective to provide spatial/visual information as similar as an actual hotel room. In addition, HVE increases customers' perceptions towards the reliability of information, the quality of hotel room and intention to book.

• 한국인터넷방송통신학회논문지
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• 제23권5호
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• pp.9-13
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• 2023

멀티미디어 스트리밍 데이터는 용량이 매우 크고 순차적으로 접근이 이루어지는 특성이 있어 전통적인 캐슁 환경에서 입출력의 성능을 개선하기 위해 널리 사용되고 있는 LRU 알고리즘이 효과적이지 못한 것으로 알려져 있다. 이에 대한 실험적인 분석은 인터벌 기반 캐슁의 LRU 대비 성능 상의 비교 우위를 통해 입증된 바 있으나, 이론적인 근거가 증명되지는 않았다. 본 논문에서는 멀티미디어 스트리밍 환경을 위한 캐슁의 최적성을 분석하기 위해 캐쉬 성능평가 모델을 설계하고, 이론적으로 최적인 캐슁 알고리즘을 인터벌 캐슁에 기반해서 설계한다. 그런 다음 설계된 알고리즘이 스트리밍 데이터의 캐쉬 미스를 최소화하는 교체 알고리즘임을 제안된 모델에 근거한 최적성 분석을 통해 입증한다.

• 한국주거학회논문집
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• 제25권1호
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• pp.41-50
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• 2014

Architectural & Interior design communication is a process of exchanging information between architects and other professionals, clients, and prospectus users, and a design medium is a means of communication. Using non-immersive, conventional media, it is challenging for architects communicate physical details and users' activities in not yet built three-dimensional buildings to others. Recent advances online, Multi-User Virtual Environments (MUVEs) allow architects and other professionals to experience a virtually constructed building together using anthropomorphic avatars. In addition, MUVEs also enable them to be aware of the presence and activity of each other. Previous studies suggest that the aforementioned characteristics of MUVEs may facilitate communication between architects and others. But these are focused on communication in controlled experimental conditions. This paper discusses the ways in which MUVEs are applied for authentic and long-term collaboration, design studio, and cultural heritage reconstruction projects, produced by digital design group at the UC Berkeley and the Technion-Israel Institute of Technology, and analyzes the influences of MUVEs on those projects. MUVEs helped more precise communication between architects, electronic engineers, and medical staffs, who are collaborating for developing pioneering technology for hospitals. In design studios, MUVEs allowed students to experience other students' design outputs, and thus helped them share ideas mutually. In addition, in cultural heritage reconstruction projects, MUVEs were used for communicating with historians and residents in order to collect evidence. Based on this study, we propose that MUVEs have strong potential for enhancing the communication between architects and other professionals.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2003년도 봄 학술발표대회논문집
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• pp.146-147
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• 2003

• 한국조경학회지
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• 제35권3호
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• pp.1-12
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• 2007

This study aims to examine the existing conditions of elderly housing facilities and to understand the characteristics and types of outdoor living environments utilized by the elderly. To achieve this, this study relied on two methods: a descriptive method of researching publications and related scholastic writings, and an empirical study that included a survey of present conditions and interviews with the elderly and their nursing care providers. Additionally, evaluation of usage patterns and physical traces were carried out in twelve cases. First, the study showed that all of the facilities, which are fixed in particular areas, had difficulty providing spatial diversity that met the needs of residences. This means that these areas lack flexibility. Activity programs were, however, carried out in a lively manner in well-equipped spaces. Second, an evaluation of outdoor living environments showed that basic facilities were more than adequate, in general. Consideration of resident's physical strength and taste, however, was evaluated as low, indicating that facilities and spaces should be considered to reflect the ages, physical capacity, diverse tastes and hobbies of the elderly, as well. Third, examining the usage patterns of outdoor living activities of residents, the purposes of using outdoor spaces of elderly housing facilities were mainly 'to take a walk' and 'to engage in simple physical exercise' and the walkway, simple sports facilities, and building entrances were highly utilized. The importance of outdoor living environments values was a mean of 4.07 and satisfaction was 4.17. This indicates that residents thought that outdoor living environments are very important and currently satisfied with them.

• 한국실내디자인학회논문집
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• 제22권5호
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• pp.3-10
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• 2013

The principle of aging-in-place should be fundamental in designing post-retirement homes to support baby boomers' healthy aging in their current living conditions. This study investigated Korean-American baby boomers' opinions about their life images in their post-retirement homes and the needs for supportive services therein. A questionnaire survey was conducted, and a total of 247 responses were used for statistical analyses. As the most important life image for their post-retirement homes, baby boomers emphasized the living environments offering various recreational activities. They indicated the post-retirement homes close to their children or family members as the next important life image. These opinions differed depending on their socioeconomic characteristics. In particular, baby boomers with higher-income preferred housing environments offering diverse recreational activities while those with lower-income preferred the housing close to more employment opportunities. In terms of supportive services available in the post-retirement homes, they wanted 'healthcare assistance services' and 'diverse recreational programs.' Gender, educational attainment, and annual income affected their preferences in these services, though. Based on the findings, this study concluded that post-retirement housing environments should create spaces to accommodate various recreational activities and include places for them to work in near-home environments. In the community, various need-based customized recreational activities and educational programs should be planned considering different socioeconomic characteristics of baby boomers. All these considerations will provide supportive residential environments for their successful aging in place.

• 한국산업정보학회논문지
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• 제9권1호
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• pp.77-84
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• 2004

최근, 국내외적으로 국가차원에서 Grid에 대한 다양한 연구가 이루어지고 Grid 컴퓨팅 기술에 대한 상용화의 추세가 보이면서 Grid 시스템에 참여하는 엔티티의 수가 날로 증가하고 있다. 따라서 Globus에 기반 한 Grid환경에서의 기존의 LDAP시스템은 늘어나는 부하를 처리하기에는 충분하지 못하게 되었고 제공할 수 있는 성능의 한계를 초과하고 있다. 이를 위하여 고성능 Grid환경에 부합되는 새로운 LDAP시스템의 설계가 필수적이고 이를 위해서는 기존 LDAP시스템에 대한 성능분석이 우선시 되어야 한다. 하지만 기존의 대부분의 연구는 읽기 동작이 대부분을 차지하는 기존의 응용들을 위한 성능향상에 목적을 두고 있어서 쓰기 동작이 대부분을 차지하는 Grid환경에 적용하기에는 부적합하다. 본 논문에서는 노드수(n), 도착율(λ), 읽기 확률(Pr)변화에 따른 분산 기반 모델과 복제 기반 모델에서 성능분석의 결과를 제시한다. 이를 위하여 M/M/l 큐잉모델을 기초로 기존 LDAP시스템에 대한 분산과 복제에 기반 한 분석모델을 도출하고, 분석모델을 통한 성능분석의 결과를 제시한다. 본 논문의 목표는 이러한 성능분석의 결과를 바탕으로 고성능 Grid환경에 부합되는 새로운 LDAP시스템의 설계방향을 제시하고자 한다. 또한 이러한 결과들은 고성능 Grid환경에서 LDAP기반의 GIS시스템의 설계에 기초자료 활용할 수 있을 것으로 사료된다.

• 한국실내디자인학회논문집
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• 제7호
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• pp.87-96
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• 1996

In today's man's domestic environments, the development of furnishings in their various shapes and functions is as complex as human lives. Architecture, Interior, and Furniture, each one of these have the relationship closer and closer to the direct human environments. In this study, by choosing the theme of sitting , the transformation of man's behavioral models would be examined in sociological terms. By viewing the chair as an emblematic objects made for more than just sitting, the chair has revealed the relations of man with his environment since the history of furnishings began. Qualified architects and designers know that chairs are no longer the objects, but the primary subject of furnishings. Through this examination of the emblematic typologies of periodic chairs in the history of the Western culture, in terms of their relationships with politics , religions, monarchies, societies, and etc., the meaning of the designs could be find and which could be the resolutions for the future innovative design. These refound or recreated meanings in the history of design could create another typology for the future reality.

• 국제초고층학회논문집
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• 제12권4호
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• pp.307-320
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• 2023

Tall buildings are built with an abundant amount of materials, including structural materials, coming from our limited natural resources. Tall buildings that began from about 10-story tall office towers have evolved to over 150-story tall mixed-use megastructures. As a building becomes taller, structural material requirement to resist lateral wind loads becomes exponentially larger. Therefore, it is crucial to employ efficient structural systems and optimize their design, which will contribute to sustainable vertical built environments through preservation of resources. Tube type structures with large perimeter diagonals are among the most efficient structural systems for tall buildings. Developments of braced tube, braced megatube, diagrid structures, and their optimal design strategies are reviewed. Superframed conjoined towers, produced by interconnecting multiple clustered braced tubes, are presented as a new design direction to achieve not only structural but also architectural and social sustainable design goals.