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- 저자 : 권태성 ( Kwon Tae Seong ) (검색결과 4 건)
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권태성 ( Tae Seong Kwon ),이승엽 ( Seung Yop Lee ),김수경 ( Soo Kyung Kim ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
There is a great demand of micro-actuators for mobile information devices such as SFF optical drives and mobile camera phones. However, conventional magnetic coils of electromagnetic motors are a major obstacle for miniaturization because of their complicated structures and large power consumption. In this paper, a linear ultrasonic motor to actuate focusing lens of mobile devices is proposed. The new actuator uses a ring type bimorph piezoelectric material, and d31 mode is adopted for applying linear motion. The interaction between inertia force and friction force makes linear motion by high-frequency saw signal input. The saw signal gives steady forces on the one direction by asymmetric inclination property of the signal itself on time domain. A commercial FEM (ANSYS) was used in this investigation for simulating structural analysis, identification of dynamic property, such as resultant displacement and coupled analysis with piezoelectric material. To evaluate the performance of the new design, a prototype was manufactured and experiments were carried out. Experimental results show the actuator motion of 1.52 mm/s at 10 kHz input signal in 5 V.
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권태성 ( Kwon Tae Seong ),박영석 ( Park Yeong Seog ),권영한 ( Kwon Yeong Han ),송미영 ( Song Mi Yeong ),신상철 ( Sin Sang Cheol ),박지두 ( Park Ji Du ) 한국산림과학회 2003 한국산림과학회지 Vol.92 No.6
This study was carried out to estimate the effects of aerial applications of fenitrothion on arthropod communities in pine forests. Since 1988 the applications have been conducted in Busan and Gyeongsangnam-province to control Monochamus alternatus Hope, a vector of the pine wilt disease, Bursapelenchus xylophilus (Steiner 81 Buhrer) Nickle. Abundance, species richness and community structure of arthropods in crown, undergrowth and ground of pine forests were compared between the aerial-sprayed and un-sprayed sites in the 4 regions in Busan and Gyeongsannam-province of Korea. The pesticide aerial applications did not make any significant influences on the abundances (No. individuals per sample) and taxon composition of arthropods, whereas it made some effects on species diversity. Arthropod richness (no. species per site) in undergrowth was lower in long-term pesticide applied sites than in short-term applied sites, whereas P-diversity (heterogeneity of species) of arthropod communities in ground was lower in pesticide-treated sites than in untreated sites.
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변정연 ( Jung Yeon Byun ),이우균 ( Woo Kyun Lee ),최성호 ( Sung Ho Choi ),오수현 ( Su Hyun Oh ),유성진 ( Seong Jin Yoo ),권태성 ( Tae Sung Kwon ),성주한 ( Joo Han Sung ),우재욱 ( Jae Wook Woo ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.1
본 연구의 목적은 산림생태계 분포 모델인 Hy TAG모델(Hydrological and Thermal Analogy Group)과 기능 모델인 MC1 모델(MAPSS-CENTURY 1) 그리고 사회·환경적 지표를 이용하여 기후변화가 한반도 산림생태계에 미치는 영향을 파악하는 것이다. Hy TAG의 식생유형분포 변화 빈도와 방향으로부터 산림식생의 민감성과 적응성을 정량화하였다. 또한 MC1으로부터 추정되는 순일차 생산량 및 토양탄소 저장량의 변이 및 경향으로부터 산림기능의 민감성과 적응성을 정량화하였다. 사회·환경적 지표로는 재정자주도 또는 산림관련 공무원 수 등과 같은 통계자료를 포함하였다. 모든 지표들을 정규화하고 취약성 평가식에 적용하여 취약성 결과를 도출하였다. 취약성 평가의 시간적 범위는 현재(1971-2000)와 미래(2021-2050)로 구분하였다. 국가 기후변화 정책의 우선순위를 판단하기 위해 지표 별 공간 분포 지도를 작성하고 행정구역간의 취약성을 비교한 결과, 지역별로 취약성의 차이가 있는 것으로 나타났다. 이러한 취약성 차이는 적응능력에 따라 가장 크게 좌우되는 것으로 판단되었다. 본 연구의 취약성 평가 방법 및 결과는 산림 경영적 측면에서 의사결정 시스템 개발과 기후변화에 대한 적응정책 수립의 판단 자료로 활용될 것이다. The purpose of this study was to assess the vulnerability of forest ecosystem to climate change in South Korea using socio-environmental indicators and the results of two vegetation models named as Hydrological and Thermal Analogy Group (Hy TAG), and MAPSS-Century 1(MC1). The changing frequency and direction of biome types estimated by Hy TAG model was used for quantifying sensitivity and adaptive capacity of forest distribution. Similarly, the variation and changing tendency of net primary production and soil carbon storage estimated by MC1 model was used for quantifying sensitivity and adaptive capacity of forest function. As socio-environmental indicators, many statistical data such as financial autonomy rate and the number of forestry officer was prepared. All indicators were standardized, and then calculated using the vulnerability assessment equation. The period of vulnerability assessment was divided into the past(1971-2000) and the future(2021-2050). To understand what policy has a priority to climate change, distribution maps of each indicators was depicted and the vulnerability results were compared among administrative districts. Evident differences could be found in entire study area. These differences were mostly derived from regional specific adaptive capacity. The result and methodology of this study would be helpful for the development of decision-making supporting system and policy making in forest management with respect to climate change.
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