• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.11a
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• pp.66-73
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• 2002

범용 가상환경 프레임워크 NAVER를 제안하고, 이를 케이브기반 가상현실환경에 적용하여 자동차 시제품 평가 실험에 활용한 사례를 소개한다. NAVER는 다양한 가상현실 어플리케이션을 구현하기 위한 가상환경 프레임워크로, 확장성이 뛰어나고 재구성이 가능하다. NAVER는 Render Server, Control Server, 그리고 Device Server로 구성되어 있으며, 각 서버는 네트워크로 상호 통신하여 각각의 기능을 수행한다. NAVER는 XML 기반 스크립팅 언어를 지원하여 사용자가 자유롭게 가상환경의 여러 가지 객체와 인터랙션을 정의할 수 있도록 설계되었다. NAVER를 케이브 기반 가상현실환경에 적용하여 자동자 시제품평가 실험에 활용하였다. KIST의 케이브 기반 가상현실환경은 4면의 정방형 스테레오 디스플레이 장치, 햅틱 암마스터 장비, 3차원 음향장비 등으로 구성되어 있어, 사용자에서 시각적인 측면에서 뿐만 아니라 촉각, 청각과 같은 여러가지 측면에서 다중현실감을 제시할 수 있다. 자동차 시제품 평가 실험를 통하여 사용자가 실제 자동차가 아닌 가상의 자동차 시제품을 관찰하고, 만져보고, 주행해 봄으로써 더욱 높은 몰입감과 현실감으로 자동차 조작장치의 조작성을 평가할 수 있음을 입증하였다.

• Science of Emotion and Sensibility
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• v.5 no.4
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• pp.77-84
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• 2002

In this paper, we propose the NAVER, a general framework for multipurpose virtual environments, and introduce the case study of evaluating car prototypes using cave-like systems. As a framework to implement variant applications in virtual environment, NAVER is extensible, reconfigurable and scalable. NAVER consists of several external modules (Render Server, Control Server and Device Server), which communicate each other to share states and user-provided data and to perform their own functions. NAVER supports its own scripting language based on XML which allows a user to define variant interactions between objects in virtual environments as well as describe the scenario of an application. We used NAVER to implement the system for evaluating car prototyes in a CAVE-like virtual environment system. The CAVE-like virtual environment system at KIST consists three side screens and a floor screen (each of them is a square with side of 2.2m), four CRT projectors displays stereoscopic images to the screens, a haptic armmaster, and a 5.1 channel sound system. The system can provide a sense of reality by displaying auditory and tactile senses as well as visual images at the same time. We evaluate car prototypes in a CAVE-like system in which a user can observe, touch and manipulate the virtual installation of car interior.

• The Journal of the Korea Contents Association
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• v.19 no.7
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• pp.427-435
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• 2019

Soundscape provides important resources to understand social and cultural aspects of our society, however, it is still its infancy to study on the research framework to record, conserve, categorize, and analyze soundscapes. Topic modeling is an automatic approach to discover hidden themes that are disperse in unstructured documents, thus topic modeling is robust enough to find latent topics such as research trends behind a collection of documents. The purpose of this paper is to discover topics on current soundscape research based on topic modeling, furthermore, to discuss the possibilities to design a metadata system for sound archives and to improve Soundscape Ontology which is currently developing.

• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2021.10a
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• pp.86-87
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• 2021

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.7
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• pp.2654-2660
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• 2010

The purpose of this paper is to organize the issues regarding the necessary components of public design in order to provide an outlook of policy guidelines on urban design based on the concept of publicity and user participation. This paper includes an in-depth analysis of CABE in order to suggest communal notions and the values of public design that would enhance the quality of public design. Thus, it can be used as a reference when catalyzing public design regulations and policies in the future. It analyzes the design review and supportive tools for good decision-making of suggested in the CABE case in order to provide an integrated model of public design to overcome the difficulties presented by current approaches of public design. The unity of values, methods, subjects, issues, and places suggested in this paper is the key notion that emphasizes the importance of the integrated model of public design through the cooperation and communication between gents involved in public design process.

• The Journal of the Acoustical Society of Korea
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• v.38 no.3
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• pp.256-265
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• 2019

Several types of cymbal transducers used for underwater detection have been studied. Representative types are Moonie, convex cymbal, and concave cymbal transducers. In this study, we analyzed the characteristics of these three types of transducers for underwater broadband projectors and compared them together. First, the influence of structural variables on the acoustic characteristics of the transducers was analyzed. Based on this, we derived the structure of each transducer type to have a specific center frequency and the maximum bandwidth. As a result of comparing the performance of the optimized transducers, the convex cymbal transducer turned out to be best in terms of both broad bandwidth and high power.

• Journal of the Speleological Society of Korea
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• v.29 no.30
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• pp.79-86
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• 1992

드문드문 펼쳐진 켄터키의 한 시골에 구부러 흘러내리는 그린천이 있다. 흐름은 유연하고, 강가에는 수목이 무성하다. 그곳 숲에 가리워진 커다란 물이 없는 동굴의 입구가 있다. 반대편에는 지평선 저쪽까지 푸른 초원이 펼쳐져 있다. 특별히 이렇다할 정도의 풍경은 아니지만, 여기에 세계 제일의 경이로운 동굴의 하나를 볼 수 있다. 이 동굴이 맘모스(매머드)동굴의 입구다. 여기서부터 전장 290km의 새끼모양의 동굴이 시작되는 것이다. 세계 최장의 동굴이다. 이 거대한 동굴은 관목이 번성한 프린트 대지와 맘모스 케이프대지, 그 사이를 침식하고 있는 호친스 계곡의 지하에까지 펼쳐진다. 10개 이상의 입구가 있고, 크고 넓은 광장, 폭넓고 긴 터널, 비뚤비뚤한 지하천이 계속된다. 수직굴은 적고, 또 낙차도 적다. 그 때문에, 물이 없는 주굴부는 이상적인 관광동굴로 개발되어 있다. 케이브대지에는 여기저기에 동굴의 일부가 관광에 이용되고 있다. 한 관광동굴에서는, 벌꿀통과 같은 동굴안을 걸어가기 위해 4시간 이상 걸린다. 프린트대지 쪽은 동굴이 복잡하고, 지금도 많은 새로운 동굴이 발견되며, 되어 지고 있다. (중략)

• Science of Emotion and Sensibility
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• v.7 no.1
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• pp.1-7
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• 2004

This study aims to validate the effectiveness of CAVE system with an Arm-Master in the evaluation of virtual prototypes. A virtual kitchen with a refrigerator was presented in the CAVE system. Subjects put in and pull out virtual objects by using the Arm-Master. Twelve subjects, six males and six females, participated in the six experimental conditions : three types of refrigerator door grips and two reaction forces. After each trial, subjects evaluated a door grip of the virtual refrigerator in terms of easiness of operation, similarity in force, presence etc. The results show the mean values of vortical-type door grips are greater than the horizontal pocket-type door grip. Also the subjects preferred 5N in the reaction force of the Arm-Master rather than 15 N when they open and close virtual door. Unexpectedly, female subjects significantly marked low scores in the evaluation terms compared ruth mali subjects. It explains the Arm-Master should be modified much more if it works effectively in design evaluation.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.2
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• pp.121-129
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• 2017

In this study, the quality of recycled aggregate for concrete was investigated as the number of recycled aggregate crushing cycles, grinder and crusher, peeling and crushing. First, the quality of density, absorption ratio and solid content was improved as the separation distance decreased and the number of crushing increased, depending on the number of crushing of recycled aggregate and the distance between mantle and cone cave. The quality of density, absorption ratio and solid content was improved as the wire mesh used in striking plate and the number of hammers increased, depending on the type of striking plate and the number of hammers.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.11
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• pp.130-136
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• 1998

This paper develops an efficient algorithm for the minimum distance calculation between two general polyhedra(convex and/or concave) in three-dimensional space. The polyhedra approximate objects using flat polygons which composed of more than three vertices. The algorithm developed in this paper basically computes minimum distance between two polygons(one polygon per object) and finds a set of two polygons which makes a global minimum distance. The advantage of the algorithm is that the global minimum distance can be computed in any cases. But the big disadvantage is that the minimum distance computing time is rapidly increased with the number of polygons which used to approximate an object. This paper develops a method to eliminate sets of two polygons which have no possibility of minimum distance occurrence, and an efficient algorithm to compute a minimum distance between two polygons in order to compensate the inherent disadvantage of the algorithm. The correctness of the algorithm is verified not only comparing analytically calculated exact minimum distance with one calculated using the developed algorithm but also watching a line which connects two points making a global minimum distance of a convex object and/or a concave object. The algorithm efficiently finds minimum distance between two convex objects made of 224 polygons respectively with a computation time of about 0.1 second.