• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.25 no.5
• /
• pp.834-840
• /
• 2001

A real time multibody vehicle dynamics model has been developed and implemented using a subsystem synthesis method based on recursive formulation. To verify real time simulation capability the developed model has been applied to HMMWV(High Mobility Multipurpose Wheeled Vehicle) with steering system. For the kinematically driven steering system, the coupled front suspension-steering subsystem can be decoupled into two SLA suspension subsystems, which improves the efficiency of simulation. To investigate theoretical efficiency, operational counting method has been also employed to compare the proposed model with the conventional recursive dynamics model. Various simulations such as unsymmetric bump run, step steering(J-turn) and sine steering input test have been carried out to verify the real time feasibility of the proposed model.

• Proceedings of the Korea Contents Association Conference
• /
• 2014.11a
• /
• pp.395-396
• /
• 2014

지속가능한 물관리 방법으로 중 소규모의 저수지 개발 필요성이 증대하고 있는 가운데 하천 유지용수의 확보 및 물순환 건전화를 위해서는 저수량 확보를 위한 과학적인 분석과 체계적인 관리 기반으로 단위 저수지에 대한 정량적 퇴적 및 준설토량의 산정 시스템이 필요하다. 저수지 준설을 위한 퇴적 토사량의 산정을 위해서는 최근 측량 현장에 도입되어 활발하게 사용되고 있는 위성측량시스템 및 음향측심기를 사용한 측량성과와 대상지역 항공사진 및 연속지적도의 다차원지형공간정보 데이터를 활용하여 관련시스템을 구축할 필요성이 있다.

• Proceedings of the Korean Society of Agricultural Engineers Conference
• /
• 2005.10a
• /
• pp.14-19
• /
• 2005

Instream flow is necessary to manage the basic function of the rivers. The evaluation method of instream flow in a big river has been studied widely, However, the study in a small river hasn't researched. In theses days the environmental function of a river becomes very important. The evaluation method and secure of instream flow are basic conditions to perform it. Especially view of stream, recreation, protection of ecology are highly demanded in a urban according to the multipurpose of river spaces. Methods for determining the instream flow in the stream were explored and examined through careful reviews and evaluations of available literatures. Development of the instream flow estimation method is based on the reviewed results and methods which can be used within the acceptable levels.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.32 no.3
• /
• pp.286-293
• /
• 1996

This paper established the analytical model of sea surface oscilation of simple type fishing port with vertical wave absorbor. This model is composed by MAEM(Matched Asymptotic Expansion Method) for wave amplification in fishing port and EEM(Eigen - function Expansion Method) for wave absorbing characteristics against vertical perforated plates. Dimensionless porosity by adopting Darcy's law was introduced to evaluate wave absorbing characteristics of the perforated structure. Using the model, the efficiency of the vertical perforated plates was studied for fishing port tranqulity with number of plates, array method and plate intervals. Optimal design and arrangement of perforated plates can be applied to develop multipurpose fishing ports and villages.

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.37 no.3_4
• /
• pp.48-60
• /
• 1995

A flood - flow forecasting system model of river basins has been developed in this study. The system model consists of the data management system(the observation and telemetering system, the rainfall forecasting and data-bank system), the flood runoff simulation system, the reservoir operation simulation system, the flood forecasting simulation system, the flood warning system and the user's menu system. The Multivariate Rainfall Forecasting model, Meteorological factor regression model and Zone expected rainfall model for rainfall forecasting and the Streamflow synthesis and reservoir regulation(SSARR) model for flood runoff simulation have been adopted for the development of a new system model for flood - flow forecasting. These models are calibrated to determine the optimal parameters on the basis of observed rainfall, 7 streamfiow and other hydrological data during the past flood periods.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
• /
• 2008.06a
• /
• pp.414-416
• /
• 2008

본 연구의 목적은 수중의 다양한 공간정보를 무인으로 획득할 수 있는 다목적용 플랫폼을 개발하는데 있다. 다목적용 플랫폼은 GPS, 음향측심기, 사이드스캔소나, 지층탐사기 등을 탑재하고 자동제어에 의한 방법으로 내수면 및 연안의 수중공간정보를 획득하는 기능을 수행한다. 무인 원격 수중 공간정보 획득장비를 개발함으로써, 기존의 측량선을 이용하기가 어려운 저수지, 댐 등의 지역 및 오염으로 인해 사람이 접근하기 불가능한 지역의 각종 수중정보 취득이 가능할 것으로 기대된다. 또한 하나의 플랫폼에 다중 에코사운더, 영상센서, 수질측정 센서 등 사용목적에 맞는 센서의 장착하여 다목적으로 사용할 수 있으므로 내수면과 관련된 정보의 획득을 필요로 하는 거의 모든 산업분야에서의 경제적인 활용이 가능할 것으로 판단된다.

• Proceedings of the KIEE Conference
• /
• summer
• /
• pp.950-952
• /
• 2004

The developments of small hydropower plants in korea have been delayed by rising construction cost/low feasibility, local people's disagreement even though the capacity of water resources are enough. However, the recent raising of electricity purchasing price, the government's enlarging plan of small hydropower plants caused the newly development to be accelerated. In this paper, the design of remote control of small hydropower plants are proposed for better economy and easy control. The operation and monitoring of power plants are planned based on One(1)-man control from the central control room of regional area water works/ operating station and engineering station multipurpose dam offices with the equipments of OS, RTU(PLC), KT leased lines, WMPS, CSU and etc.

• Journal of Korea Multimedia Society
• /
• v.6 no.2
• /
• pp.276-287
• /
• 2003

Wireless Internet has to offer various types of services as much as wired network does in the scope of Internet business. The browser for simple data service using SMS in the early wireless internet cannot serve various multimedia contents. In this paper, We design and implement a Java browser that runs Java program, by adding JVM(Java Virtual Machine) into the web browser for mobile terminals. The Java browser for mobile terminals dynamically loads various Java program you want. This browser makes it possible to be multipurpose mobile terminals for E-Commerce, E-Wallet, Game Device.

• Journal of the Korean Society of Mechanical Technology
• /
• v.13 no.4
• /
• pp.131-136
• /
• 2011

In commercial vehicle, sub-frame which equipped in main frame supporting dump deck and oil tanker. This is the main structure for all equipment which including joint function. Sub-frame is made by welding process, this susceptible to deform and crack by its longitudinal size. Also various kind of sub-frame make it difficult to standardization in manufacturing process and exclusive jig is not adapted yet. Frame size is over 6~8m and weight is more than 300kg this make re-work more difficult. If manufacturing company made precise sub-frame, this is not only convenient for customers but also save the company money by reducing the working time. In this study manufacture the sub-frame be suitable for its main function and develop exclusive welding jig for obtain checking fixture function as well.

• Radioisotope journal
• /
• v.21 no.4
• /
• pp.55-65
• /
• 2006

A passive type radon monitor adopting two silicon PIN detector as radiation detector has been developed, manufactured and test-evaluated. A radiation signal processing circuit has been electronically tested and then the radiation detection characteristics of this instrument has been performance-tested by using reference radon concentration and a reference photon radiation field. As a result, in a electronic performance test, radiation signals from each detector were well observed in each signal processing circuit. The radiation detection sensitivity of this instrument after several test-irradiations to a Cs-137 gamma radiation source and a standard radon concentration appeared to be 1.37 cph/$\mu$Svh-1 and 1.66 pCi/L respectively. The developed radon monitor in this paper could be used conveniently in monitoring of radon concentration in buildings which population utilize in Korea.