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초음파 hyperthermia용 육각환 변환기의 설계및 제작에 관한 연구
조영환,성굉모,Cho, Young-Hwan,Sung, Koeng-Mo 한국음향학회 1989 韓國音響學會誌 Vol.8 No.4
초음파 hyperthermia를 이용한 암 치료는 정상세포에 열적 손상을 주지 않으면서 종양 부위만을 적당한 온도로 가열하여야 하며 따라서 종양세포와 정상세포에 대한 정확한 초음파 세기 조절이 필요하게 된다. 본 연구에서 초음파 hyperthermia용 변환기로써 촛점 거리와 집속 범위를 전자적으로 조절할 수 있는 육각환 변환기를 설계, 제작하였으며 위상조 절회로를 이용하여 초음파 hyperthermia 시스템을 구성, 그 음향 특성을 측정하였으며 모의 생체 실험을 수행하였다. 실험 결과 촛점 부근에서 초음파 에너지가 집속되는 것을 확인하였으며 초음과 hyperthermia 시스템으로써의 유용성을 확인하였다. In the clinical application of ultrasonic hyperthermia, selective heating of tumor is essential and thus precise control of ultrasonic intensity in both tumor and normal tissue is needed. In this paper, a hexagonal array transducer for ultrasonic hyperthermia is designed and manufactured of which focal point and focal region can be ocntrolled by the digital phase control circuit proposed by authors. Profiles of the focussed ultrasound beam in water and those of temperature in phantom were determined. The experimental and computed results are in good agreement.
都市林學(Urban Forestry)의 學問的 體系와 都市綠地空間에 對한 適用 硏究
조영환,Cho, Young-Hwan 한국조경학회 1990 韓國造景學會誌 Vol.18 No.3
It is the purpose of this study to address how to manage the urban vegitation using the concept of Urban Forestry which is relatively new to Korea. When we consider the Urban Forestry as a science, We should understand it interdisciplinary subject which includes Forestry, Horticulture, Urban Planning, Landscape Design, Landuse Planning, Business and Humanities. It may say that people and tree are the fundermental components of Urban Forestry. So there are two ways of Urban Forestry Applications-How people care for trees and How trees care for People-. For the application, this study places the focus on the monetary valuation, tree inventory system and traditional forestry application to urban forest management. Pubic Relation, Communication, Ordinances and Budget are also mentioned as a part of Urban Forestry Policy. Monetary valuation of trees and forests is very important for the proper cognition of their real value. So that, they may be equated and weighed against conflicting uses which would cause to be removed or severely mutilated. A tree inventory system which is the essential part of urban tree management can provide the pertinent information about the present condition of urban tree resource. It may aid in reducing the subjectivity of tree management decisions and stimulate them to be made rapidly and can help reduce potential municipal liability by identifying serious problems in time for corrective maintenance practices to be applied for the maximize community benefits and minimimize public nuisances or hazards. Managers can derive the information from the inventory and use it for the various management plan. When we see the structure of tree inventory system as one of the data base management system, Computer is the best equipment for the efficient management plan. Public relation and communication is also important factors to care the people for urban vegetation management. Volunteer management system is a good example for the public relation and communication. Those skills are need to develop for using the priceless, valuable human resources. Budget holds the key to the execution of Urban Forestry. Good inventory can provide for efficient budgeting stratiges through it's scientific analysis for the way of maximum benefits and minimum costs. Forest can be play a vital role for the aesthetic improvement and recreation in the city. This study suggests that the traditional sivicultural application not only improve the quality of scenic beauty and recreation but also the products of timber. So it is more needed to study for strong and scientific application to urban forest management.
기계화학반응에 의한 TiN/TiB<sub>2</sub>/Ti-silicides 나노복합분말의 합성과 반응기구
조영환,김지우,심재혁,안재평,오규환,Cho Young-Whan,Kim Ji-Woo,Shim Jae-Hyeok,Ahn Jae-Pyoung,Oh Kyu-Hwan 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
Nanostructured TiN/$TiB_2$/$TiSi_2$ and TiN/$TiB_2$/$Ti_5Si_2$ composite powders have been prepared by mechanochemical reaction from mixtures of Ti, BN, and $Si_3N_4$ powders. The raw materials have reacted to form a uniform mixture of TiN, $TiB_2$ and $TiSi_2$ or $Ti_5Si_3$ depending on the amount of $Si_3N_4$ used in the starting mixtures, and the reaction proceeded through so-called mechanically activated self-sustaining reaction (MSR). Fine TiN and $TiB_2$ crystallites less than a few tens of nanometer were homogeneously dispersed in the amorphous $TiSi_2$ or $Ti_5Si_3$ matrix after milling for 12 hours. These amorphous matrices became crystalline phases after annealing at high temperatures as expected, but the original microstructure did not change significantly.
조영환(Young-Hwan Cho),강지훈(Ji-Hoon Kang) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1B
XML 문서의 논리 구조인 DTD(Document Type Definition) 의 규칙에 맞게 XML 문서를 작성하기 위해서는 문서 구조를 잘 모르는 일반 사용자도 쉽게 사용할 수 있는 XML 문서 편집기가 필요하다. 기존의 XML 문서 편집기는 XML 문서의 구조 정보를 메모리 내에 트리 구조로 생성한 후에 응용 프로그램에서 문서 편집을 위해 그 정보를 이용함으로써 구조 정보 트리 생성을 위해서 적지 않은 시스템 자원을 필요로 한다. 본 논문에서는 자원의 사용을 효율적으로 하며 편집기의 환경에 알맞은 문서 구조 정보를 유지하기 위하여 이벤트-기반 인터페이스인 SAX(Simple API for XML)를 이용하여 문서편집기를 설계하고 구현하였다. 본 시스템은 전체 문서를 위한 구문 분석 트리를 유지할 필요가 없으므로 자원을 효율적으로 사용하였으며, 구문 분석 트리를 이용하지 않고 직접 구조 정보 트리를 생성함으로써 문서 편집기의 환경에 적합한 구조 정보를 유지할 수 있었다.