• Proceedings of the IEEK Conference
• /
• 1998.10a
• /
• pp.309-312
• /
• 1998

B-ISDN에서 교환 노드로서 동작하게 될 ATM 교환 시스템은 사용자 단말이 ITU-T 신호 권고안을 사용하는 단말과 ATM Forum 신호규격을 사용하는 단말이 공존할 수 있다는 전제하에 모든 신호 프로토콜을 다 수용할 수 있는 호/연결 제어 소프트웨어가 요구된다. 따라서 이 논문에서는 ITU-T 신호 프로토콜과 ATM Forum 신호 프로토콜에 대하여 신호 메세지, 정보 요소, 신호 능력을 비교 검토하여 정리하였다. 이 비교 검토 결과에 따라서 ITU-T 1.2931, 1.2971, ATM Forum UNI3.1 신호 프로토콜을 처리하는 기능 블럭과 UNI4.0 신호프로토콜을 처리하는 기능 블럭을 분리하여 신호 프로토콜을 처리하도록 가입자 호/연결 제어 소프트웨어를 구현하였다.

• Journal of Advanced Marine Engineering and Technology
• /
• v.22 no.6
• /
• pp.800-808
• /
• 1998

In this study the thermal stress distribution and deformantion characteristics resulting from the nonuniform temperature fields of the cylinder block of a light 3-cylinder 4-stroke gasoline engine were analyzed using the 3-dimensional finite element method. The temperature distributions req-uisite for the thermoelastic behavior alalysis were obtained from the steady-state heat conduction analysis performed on the basis of experimental data. in order to examine the effect of a ceramic material the cylinder liner was replaced by the silicon nitride($Si_{3}N_{4}$) and its thermal behaviors were compared with those of the original block.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.14 no.2
• /
• pp.291-298
• /
• 1994

This paper presents a new stiffness matrix for the analysis of arbitrary thin-walled open beams in warp-restrained torsion. The element accounts for both flexural and warping torsional effects. To eliminate the ad hoc introduction of St. Venant stiffness in this $C^0$ element, the virtual work equation based on an orthogonal Cartesian coordinate system is used. The effectiveness of the derived block stiffness is addressed. The transformation matrix between two different reference systems is also shown. Numerical examples using the proposed matrix are compared with the classical solutions or other previous results in the literature.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.05a
• /
• pp.301-304
• /
• 2002

Powertrain simulation is important fur the analysis of a vehicle performance. Automotive powertrain has been considered as the unified system and should be remodeled, whenever a powertrain system is changed. In this study, a new method is proposed for the synthetic modeling for the automotive powertrain. Components are separated from the powertrain system and constructed the matrix through dynamic relationships. The dynamic equation of the total powertrain system can be driven from the combination of each component. In order to combine each component, the superposition method is modified for the powertrain composition.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.10a
• /
• pp.439-442
• /
• 2002

Powertrain simulation is important far the analysis of a vehicle performance. Automotive powertrain has been considered as the unified system and should be remodeled, whenever a powertrain system is changed. In this study, a new method is proposed far the synthetic modeling for the automotive powertrain. Components are separated from the powertrain system and constructed the matrix through dynamic relationships. The dynamic equation of the total powertrain system can be driven from the combination of each component. In order to combine each component, the superposition method is modified for the powertrain composition.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2000.11a
• /
• pp.243-248
• /
• 2000

하드디스크의 트랙 밀도를 높이기 위해서는 충분한 서보대역을 갖는 액츄에이터를 개발하는 것이 필수적이다 이 논문에서는 액츄에이터의 동특성 중에서 서보대역을 제한하는 주된 요인을 알아보기 위해 실험 모드 해석과 유한 요소 해석을 수행하였다. 우선 액츄에이터를 구성하고 있는 VCM 코일, E 블럭, 서스펜션등의 부분계에 대한 유한 요소 해석을 수행하였고 모달 실험을 통해 이를 검증하였다. 검증된 각 부분계의 모델을 결합하여 한 개의 서스펜션을 갖는 액츄에이터 시스템의 유한 요소 모델을 개발하였고 이를 통해 서보 성능과 관계된 모달 파라미터들을 규명하였다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.15 no.2
• /
• pp.157-164
• /
• 1997

This study deals with GPS-photogrammetry practicability by C/A-code reception. It allows data to be acquired and analyzed fast. Combined block adjustment method was applied at the topographical map production of coast-land. And we compared it that of conventional block adjustment. As a result, it was found that accuracy was very sensitive to the arrangement and number of control points. The accuracy in the horizontal and vertical was $\pm{2cm}$ if all of the control points was available. however accuracy was not affected at additional parameters for systematic errors' elimination and it leads to bad results when the number of control points was few and arrangement of control points was not stabilized. GPS observations were added in block adjustment, but the accuracy of block was not upgraded due to the low accuracy of C/A-code reception. So relative positioning method with carrier phases was required for high accuracy and it is expected that CPS photogrammetry with C/A-code will be used widely according to the improvement of observation methods and the development of receiver.

• Journal of the Korean Institute of Rural Architecture
• /
• v.2 no.1
• /
• pp.101-112
• /
• 2000

Green environment is most important factor to human being taking a side view of psychological aspect. But, as the civilization progresses rapidly, the green environment decreases. At present, various environmentally friendly methods are developed to prevent the ill effect of the concretes. n this study, Ecostone retaining wall method, which is a kind of environmentally friendly block, are used for verifying the application to the slope stability and protection of rural hosing. In case of rural hosing and structure, the height of the slope is not high and additional loading doesn't act on the slope except the gravity loading of housing and structure. From the result of the stability analysis of Ecostone, 3m to 7m Ecostone retaining wall can have an equivalence capacity comparing with the concrete retaining wall. Therefore, Ecostone method can apply to retaining wall with the structural safety and environmentally friendly aspect using the plants and vegetation.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.23 no.1
• /
• pp.59-67
• /
• 2005

This paper proposes method for determining exterior orientation parameters (EOPs) from the RPC mathematical camera model of the satellite image. SPOT satellite stereo pair is pre-tested using the proposed method. As results that, geopositioning errors are similar with those of the original EOPs. Differences between EOPs determined from the RPC and original EOPs were small. IKONOS Geo-level stereo pair is tested by the proposed method. Results of this method are compared with those of the RPC block adjustment method which have been verified in reported studies. Consequently, the proposed method showed accuracy similar to the RPC block adjustment method. The digital elevation models (DEMs) of sample area acquired by the two method almost did not have a difference.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
• /
• 2008.10a
• /
• pp.358-363
• /
• 2008

최근 아날로그 항공사진카메라는 디지털방식으로 급속히 변화하고 있어 이에 따른 다양한 실험연구가 수행되고 있다. 디지털 카메라는 CCD의 구조와 촬영방식에 따라 크게 면형방식(area array)과 선형방식(line array)으로 구분되며 기술적으로 서로 상이한 원리로 영상을 취득하고 있다. 본 논문에서는 블록 조정에 횡스트립을 추가하여 블록 조정하였을 때 안정성에 얼마나 큰 영향이 있는지 알아보았다. 본 논문은 촬영시 추가한 횡스트립이 블록기하의 안정성에 미치는 영향을 검증하기 위하여 블록조정 결과에 따른 외부표정요소의 정확도를 비교 분석하였다. 연구결과 횡스트립을 추가하였을 때는 외부표정요소의 정확도가 크게 향상됨을 알 수 있었다. 향후 디지털 카메라에 의한 촬영시 적절한 중복도와 횡스트립의 배치간격 등에 대한 연구가 계속해서 이루어져야 될 것으로 판단된다.