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Isolation of Insect pathogenic bacteria from Bombus terrestris and B. ignitus in Korea
Won Tae Kim,Byeong Do Park,Ji Young Choi,Jong Gill Kim,Seok Jo Whang,Hyung Joo Yoon,Sang Mi Han,Mi Ae Kim 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.05
Bumblebees are important pollinators in greenhouse and have colonized all parts of the World. In Korea, the value of bumblebees is increasing as pollinator. However, the more recent use of reared colonies may ultimately allow pathogens to spread to peripheral areas for bumblebees. Generally, bumblebees are hosts to a large number of parasites which are mites, flies, protozoa, fungi, virus and bacteria. For most of these, very little is known about their effects against host insect, epidemiology or evolutionary ecology. So, we report pathogenic bacteria isolated from Bombus terrestris and B. ignitus at first time in Korea. Bacillus fusiformis and Klebsiella oxytoca are isolated from B. terrestris and confirmed with 16S rRNA gene nucleotide comparison in NCBI genebank. Pathogenicity of B. fusiformis was 35~40% against B. terrestris. Pantoea dispersa and K. oxytoca are isolated from B. ignitus and confirmed with 16S rRNA gene nucleotide comparison in NCBI genebank. Pathogenicity of these species were 35~40% against B. ignitus. These pathogenicity are considered as low-level.
Constrained Robust Kalman Filtering for Passive Source Localization
Won-Sang Ra,Ick-Ho Whang,Tae-Sung Yoon 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, a constrained robust Kalman filter(CRKF) approach to passive target localization based on a geometrically constrained sensor network is newly proposed. Our approach is strongly motivated by the in he rent problem of the previous stochastic robust Kalman filters(RKFs) which are very sensitive to the in a ccurate aprioristatistical information on the stochastic parametric uncertainties. To solve this sensitivity problem, an additional state-equality constraint comes from the given sensor geometry is a ugmented with the conventional stochastic RKF costusing Lagrange multipliers. A minimizing solution to this constrained optimization problem givesus a new CRKF recursion. From the resultant filter structure, it is shown that the use of additional state-equality constraint corrects the imperfect statistical knowledge on the stochastic uncertainties and plays an important roleinensuring both the otimality and the reliability of the proposed filter. Computer simulations for the passive target tracking based on geometrically constrained sensor network demonstrate the reliable estimation perfomance of the proposed method compared to the existing ones.
제태진(Tae-Jin Je),이강원(Kang-Won Lee),박상천(Sang-Cheon Park),최두선(Doo-Sun Choi),황경현(Kyung-Hyun Whang) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Demands for high-performance, high-efficiency and compaction in display industry are satisfied with improvement of optical properties through complex structured pattern. In this paper, two methods for machining double angled micro pattern were proposed using shaping method and SCD diamond and was analysed through machined surface problem alike double machined valley lines, under depth machined, asymmetry pattern. It presents improvement of machining process and quality of machined surface on making micro complex pattern.
주행거리계의 기구적 오차에 강인한 개선된 상대 위치추정 알고리즘
나원상(Won-Sang Ra),황익호(Ick-Ho Whang),이혜진(Hye-Jin Lee),박진배(Jin Bae Park),윤태성(Tae-Sung Yoon) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.9
In this paper, a novel localization algorithm robust to the unmodeled systematic odometry errors is proposed for low-cost non-holonomic mobile robots. It is well known that the most pose estimators using odometry measurements cannot avoid the performance degradation due to the dead-reckoning of systematic odometry errors. As a remedy for this problem, we try to reflect the wheelbase error in the robot motion model as a parametric uncertainty. Applying the Krein space estimation theory for the discrete¬time uncertain nonlinear motion model results in the extended robust Kalman filter. This idea comes from the fact that systematic odometry errors might be regarded as the parametric uncertainties satisfying the sum quadratic constrains (SQCs). The advantage of the proposed methodology is that it has the same recursive structure as the conventional extended Kalman filter, which makes our scheme suitable for real-time applications. Moreover, it guarantees the satisfactory localization performance even in the presence of wheelbase uncertainty which is hard to model or estimate but often arises from real driving environments. The computer simulations will be given to demonstrate the robustness of the suggested localization algorithm.
객체지향 데이타베이스 시스템에서의 권한 충돌 탐지 기법
손태종(Tae-Jong Son),김원영(Won-Young Kim),조완섭(Wan-Sup Cho),황규영(Kyu-Young Whang) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅰ
본 논문에서는 의도형 권한부여(intention type authorization) 개념을 도입하여 객체지향 데이타베이스 시스템에서 발생할 수 있는 권한 간의 충돌을 효율적으로 탐지하고 해결하는 새로운 기법을 제안한다. 객체지향 데이타베이스 시스템에서 널리 사용되는 객체 단위의 묵시적 권한부여(implicit authorization)에서는 권한부여의 일관성(consistency) 유지와 중복성(redundancy) 방지를 위하여 기존의 권한과 새로이 추가될 권한간에 충돌 여부의 검사가 필수적이다. 제안된 의도형 권한부여에서는 권한 호환성 행렬(authorization compatibility matrix)이라는 새로운 개념을 도입하여 권한간의 충돌 여부를 효율적으로 탐지하나다. 도입된 권한 호환성 행렬은 데이타베이스 시스템의 동시성 제어 기법에서 로크간의 충돌 방지를 위해 사용된 로크 호환성 행렬(lock compatibility matrix)을 권한부여에 적합하도록 확장한 것으로 기존 방식보다 빠른 충돌 여부 탐지를 보장한다.
미세 V 그루브 파형패턴 가공에서 공구 여유각 영향에 관한 연구
제태진(Tae-Jin Je),이강원(Kang-Won Lee),최두선(Doo-Sun Choi),이응숙(Eung-Suk Lee),황경현(Kyung-Hyun Whang),이종찬(Jong-Chan Lee) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Recently, micro complex structured pattern and machining technology are needed to meet demands for high-performance, large size and compaction in LCD display. It presents the machining characteristics of micro V groove waved pattern. Experiments were carried out for changing relief angle of tool in machining micro V groove waved pattern using PCD to obtain proper waved prism shape decreased effect of relief surface. Machining surface and cutting force are used to analyse effect about changing relief angles of tool with 3° and 10°.
객체지향 데이타베이스 시스템에서 의도형을 이용한 권한 충돌 탐지 기법
손태종(Tae-Jong Son),김원영(Won-Young Kim),조완섭(Wan-Sup Cho),황규영(Kyu-Young Whang) 한국정보과학회 1998 정보과학회논문지(B) Vol.25 No.6
객체지향 데이타베이스 시스템에서 많이 연구되고 있는 묵시적 권한부여(implicit authorization) 방법은 모든 객체에 대하여 일일이 권한을 부여하는 오버헤드를 줄이기 위한 방법이다. 묵시적 권한부여 방법에서는 기존의 권한과 새로이 추가될 권한간의 충돌(conflict) 여부의 효율적인 검사가 중요하다. 본 논문에서는 의도형 권한부여(intention type authorization) 개념을 도입하여 묵시적 권한부여 하에서 발생할 수 있는 권한간의 충돌을 효율적으로 탐지하는 새로운 기법을 제안한다. 데이타베이스 단위 계층(database granularity hierarchy)에서의 임의의 한 노드 n에 추가로 권한을 부여할 때, 기존 권한과의 충돌 탐지를 위하여 기존의 방식에서는 n의 자손 노드에 대한 권한들을 일일이 단위 계층을 따라 내려가 탐색해야 하는 어려움이 있었다. 그러나, 제안된 의도형 권한부여 기법은 단위 계층을 따라 내려가지 않고 노도 n에서 충돌 여부를 바로 판정할 수 있는 장점을 가진다. Many object-oriented database systems have used the notion of implicit authorization to avoid the overhead caused by explicitly storing all authorizations for each object. In implicit authorization, it is very important to efficiently detect conflicts between existing authorizations and new authorizations to be added. In this article we propose a new notion of intention type authorization and a conflict detection mechanism that can be used with implicit authorization. When we grant an authorization on a node n in the database granularity hierarchy, the existing method is inefficient in determining the conflicts since it needs to examine all authorizations on the descendants of the node n. In contrast, our mechanism has the advantage of detecting the conflicts immediately at the node n where an explicit authorization is to be granted.