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김현구,최재우,손정봉,정우식,이화운 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.6
An analysis of wind environments using computational fluid dynamics and an evaluation of wind resources using measurement data obtained from meteorological observation sites at Homi-Cape, Pohang have been carrid out for siting a wind farm. It was shown that a numerical simulation using computational fluid dynamics would provide reliable wind resource map in complex terrain with land-sea breeze condition. As a result of this investigation, Homi-Cape wind farm with 11.25 MW capacity has been designed for maximum power generation and 25.7GWh electricity production is predicted.
가상공간에서 실시간 네비게이션을 위한 셀 로딩 알고리즘
이기동(Kidong Lee),손정봉(Jungbong Son),최창은(Changeun Choi) 한국콘텐츠학회 2003 한국콘텐츠학회 종합학술대회 논문집 Vol.1 No.1
3차원 실세계를 2차원 평면상에 표현하기에는 화면의 복잡도, 정보의 왜곡, 생동감의 결핍 등의 한계가 뒤따른다. 또한 각 객체의 디자인 한계성과 지속적인 데이터 양의 갱신이 필수조건이지만 실시간 네비게이션의 복잡성과 많은 데이터양의 활동에 있어 속도감의 문제가 발생한다. 이를 해결하기 위해 실시간 네비게이션 셀로딩 알고리즘을 제안한다. while they cannot overcome the limitation that arises in the process of representing the 3D real world to the 2D plane. Also, there exists requirements on performance to support realtime navigation capability. In this paper, therefore, we propose a cell loading algorithm for navigating virtual space that can support realtime visualization according to the multimedia objects in variety and the change of the view point by user, and that can accommodate the capacity imposed in the process of navigation regardless of the number of objects.
Mechanical Design of a 750 ㎾ Direct - drive Wind Turbine Generator System
손영욱(Y. U. Sohn),손정봉(J. B. Son),박인수(I. S. Park),김영찬(Y. C. Kim),김경렬(K. R. Kim),정진화(C. W. Chung),전중환(Ch. H. Chun),류지훈 박지훈(J. Y. Ryu),박진일(J. I. Park),변철진(C. J. Byun),김두훈(D. H. Kim) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
A prototype of 750 ㎾ direct-drive wind turbine generator system, KBP-750D is under development in Korea. For the gearless, direct-drive prototype a synchronous generator with permanent magnets has been developed. The upwind 3-blade type machine employs variable speed and pitch control. The operating ranges of wind and rotor speed are 3 to 25 m/s and 9 to 25 rpm, respectively. The tip speed ratio of rotor blade is 7.5, designed for power coefficient 0.47. The blade pitch and torque are controlled with the predefined torque-speed curve according to the conditions of wind and public electric grid. This paper describes the outlines of primary components of KBP-750D.
박형후(Hyong-Hu Park),심재구(Jae-Goo Shim),박정규(Jeong-kyu Park),손정봉(Jeong-Bong Son),권순무(Soon-Mu Kwon) 한국방사선학회 2021 한국방사선학회 논문지 Vol.15 No.1
본 연구는 혼합현실을 기반으로 하는 비파괴 분야의 교육용콘텐츠를 만들기 위해 시행되었다. 현재 방사선 분야에는 교육용 혼합현실 기반 교육용 콘텐츠는 거의 없는 실정이다. 그리고 비파괴검사분야는 작업환경이 열악하고, 종사자 수도 한 업체당 직원 수가 10인 이하인 곳이 많고, 교육적 인프라도 잘 구축되어 있지 않다. 강의식으로 전달만 하는 실습교육과 안전교육이 시행되고 있다. 이를 해결하기 위해 혼합현실을 기반으로 한 비파괴 종사자 교육용 콘텐츠를 개발하게 되었다. 이 콘텐츠는 Microsoft사의 HoloLens 2 H MD 디바이스를 기반으로 개발되었고, 1280*720의 해상도를 기준으로 제작되었고, 디바이스마다 해상도가 달라 Anchor의 Left, Right, Bottom, TOP위치를 맞추어 Side를 제작하였고, 이미지가 큰 것은 Atlas의 크기에 영향을 미치기 때문에 배경화면이나 상단 바와 같이 부피가 큰 것은 UITexture로 대체하여 제작되었다. UI Widget Wizard에서는 Label, Buttom, ScrollView, Sprite를 제작하였다. 본 연구는 종사자에게 현장감 있는 교육내용을 제공하고, 자기 주도적인 교육을 가능하게 하고, 현실을 바탕으로 한 3D 입체영상으로 교육할 수 있어 흥미와 몰입도 있는 교육을 시행할 수 있다. 혼합현실에서 제공되는 영상을 통해 현실세계와 가상현실 간에 상호작용을 통해 학습자가 직접 사물을 조작할 수 있어 학습자의 학습 능률을 높일 수 있다. 또한 혼합현실 교육을 시행하면 시간과 장소에 구해를 받지 않아 코로나 시대에 비대면 학습 콘텐츠로 큰 역할을 할 수 있을 것으로 사료된다. This study was written to create educational content in non-destructive fields based on Mixed Reality. Currently, in the field of radiation, there is almost no content for educational Mixed Reality-based educational content. And in the field of non-destructive inspection, the working environment is poor, the number of employees is often 10 or less for each manufacturer, and the educational infrastructure is not built. There is no practical training, only practical training and safety education to convey information. To solve this, it was decided to develop non-destructive worker education content based on Mixed Reality. This content was developed based on Microsoft s HoloLens 2 HMD device. It is manufactured based on the resolution of 1280 * 720, and the resolution is different for each device, and the Side is created by aligning the Left, Right, Bottom, and TOP positions of Anchor, and the large image affects the size of Atlas. The large volume like the wallpaper and the upper part was made by replacing it with UITexture. For UI Widget Wizard, I made Label, Buttom, ScrollView, and Sprite. In this study, it is possible to provide workers with realistic educational content, enable self-directed education, and educate with 3D stereoscopic images based on reality to provide interesting and immersive education. Through the images provided in Mixed Reality, the learner can directly operate things through the interaction between the real world and the Virtual Reality, and the learner s learning efficiency can be improved. In addition, mixed reality education can play a major role in non-face-to-face learning content in the corona era, where time and place are not disturbed.
손영욱(Y.U. Sohn),박인수(I.S. Park),권세진(S.J. Kwon),김영찬(Y.C. Kim),손정봉(J.B. Son),김경렬(K.R. Kim),정진화(C.W. Chung),전중환(J.H. Chun),류지윤(J.Y. Ryu) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Load calculation is indispensable for the construction of a large wind turbine generator system (WTGS). In procedures of load calculation, all conditions affecting to WTGS such as environment of site, operation, transport and installation have to be considered systematically. So the certification of WTGS is issued by assuring the load calculation. This work shows the generals of load calculation briefly and introduces the characteristics and results of load calculations for the 750 ㎾ direct-drive WTGS (KBP-750D) which is under development by the consortium of POSTECH and UNISON.