• 제어로봇시스템학회:학술대회논문집
• /
• 1993.10a
• /
• pp.1042-1046
• /
• 1993

This paper describes a control scheme for a robot manipulator system which uses visual information to position and orientate the end-effector. In this scheme, the position and orientation of the target workpiece with respect to the base frame of the robot are assumed to be unknown, but the desired relative position and orientation of the end-effector to the target workpiece are given in advance. The control scheme directly integrates visual data into the servoing process without subdividing the process into determination of the position and orientation of the workpiece and inverse kinematics calculation. A neural network system is used for determining the change in joint angles required in order to achieve the desired position and orientation. The proposed system can be control the robot so that it approach the desired position and orientation from arbitrary initial ones. Simulation for the robot manipulator with six degrees of freedom will be done. The validity and the effectiveness of the proposed control scheme will be verified by computer simulations.

• Proceedings of the KIEE Conference
• /
• 2005.10b
• /
• pp.231-233
• /
• 2005

For the low-power design of the mobile multimedia system architecture, this paper modeling the mobile multimedia system and analysis the power consumption profile about the whole communication environment. The mobile system model consist of air interface, RIP front-end, base-band processing module and human interface. For the result of power consumption profile analysis, the power consumption of multimedia processing is above 60% compare to the whole power consumption in mobile multimedia system. To minimize the power consumption in processing module which consumes the large power, this paper proposed the Microscopic DVS technique which applies the optimum voltage for the each multimedia frame. For the simulation result, proposed power minimization technique reduce the power consumption about 30%.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.11 no.4
• /
• pp.168-172
• /
• 2012

Control arm is the structural component that pivots on two places. One end of the control arm is attached to the body frame and the other end is attached to the steering knuckle. The former research proposed the structural design by applying optimization technique with aluminum alloy. This study suggests a durability test method on the developed upper control arm to validate the analysis results. The durability analysis results of the developed control arm by using MSC Fatigue is confirmed to be close to infinite life. The weak model of developed control arm which occurs to finite life is made to perform the durability test and the zig design is developed in this process.

• Proceedings of the KSR Conference
• /
• 1999.05a
• /
• pp.185-191
• /
• 1999

This paper deals with a method to predict the noise level inside metro electric cars running a single-line tunnel at the speed of 80km per hour using ray tracing method, a kind of ray acoustics generally used for a high-frequency and air-born noise analysis. The interior of the car including a under-frame, seats, side doors, end doors, door-pockets, side panels, end panel, a roof panel and so on is modeled. And in order to describe the noise power coming inside, artificial noise sources are designated using sound transmission loss data of each section measured from simple tests and external noise level. The noise level inside the car is calculated and its properties are investigated. The results satisfy the criteria on noise level inside the car.

• Information and Communications Magazine
• /
• v.10 no.10
• /
• pp.22-29
• /
• 1993

This paper describes development of a real-time voice recognition dialing system which can recognize around one hundred word vocabularies in speaker independent mode. The voice recognition algorithm is implemented on a DSP board with a telephone interface plugged in an IBM PC AT/486. In the DSP board, procedures for feature extraction, vector quantization(VQ), and end-point detection are performed simultaneously in every 10msec frame interval to satisfy real-time constraints after the word starting point detection. In addition, we optimize the VQ codebook size and the end-point detection procedure to reduce recognition time and memory requirement. The demonstration system is being displayed in MOBILAB of Korea Mobile Telecom at the Taejon EXPO '93.

• Structural Engineering and Mechanics
• /
• v.6 no.4
• /
• pp.427-437
• /
• 1998

Flat plate constructions are structural systems which are directly placed on columns without any beams. Various solution methods have been introduced for the solution of flat plate structures under horizontal and vertical loads. In most of these solution methods, models comprising of one column and one plate have been studied. In other solutions, however, co-behavior of two reciprocal columns has been investigated. In this study, interrelations of all the columns on one storey have been examined. At the end of the study structure consisting of nine columns and four plates has been chosen as a model. Then unit moment has been successively applied to each of these columns and unit moments carried over the other columns have been found. By working out solutions far plates and columns varying in ratio, carry-over factors have been found and these factors given in tables. In addition, fixed-end moment factors on the columns arising due to vertical load were also calculated. Then citing slope-deflection equations to which these results could be applied, some examples of moment and horizontal equilibrium equations have been given.

• Structural Engineering and Mechanics
• /
• v.74 no.2
• /
• pp.189-199
• /
• 2020

Researchers have elaborated several accurate methods to calculate member-end rotations or moments, directly, for bridge-type structures. Recently, the concept of rotation and moment propagation (RMP) has been presented considering bending flexibility, only. Through which, in spite of moment distribution method, all joints are free resulting in rotation and moment emit throughout the structure similar to wave motion. This paper proposes a new set of closed-form equations to calculate member-end rotation or moment, directly, comprising both shear and bending flexibility. Furthermore, the authors program the algorithm of Timoshenko beam theory cooperated with the finite element. Several numerical examples, conducted on the procedures, show that the method is superior in not only the dominant algorithm but also the preciseness of results.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2004.05b
• /
• pp.263-266
• /
• 2004

인터넷을 이용한 정보가 모든 정보 전달의 기본이 되고 있다. 따라서 이러한 정보 전달의 보호를 위한 정보보호 산업이 급성장하게 되었다. 따라서, 본 논문에서는 향후, 2007년경에 IPV6를 기반으로 하는 유비쿼터스 환경 하에서의 각 가정의 홈 네트워크를 구성할 때 필요한 보안적인 측면의 방법에 대해서 제시하고자 한다. 이러한 다양화된 디지털 매체가 디지털 가전, 정보통신 시스템과 접속하여 새로운 메카니즘의 보안 설계 대상이 필요하게 됨에 따라서, 새로운 정보보호의 접근이 필수적이다. 본 논문에서 제시하고자 하는 내용은 암호학적으로 안전한 홈네트워크의 구성과 이를 실현하기 위해서 요구되어지는 다양한 고려사항 둥을 분석하여 차세대의 멀티 컴퓨팅 환경 하에서의 정보보호 시스템 구축에 대한 알고리즘 및 개발에 도움이 되고자 한다.

• Journal of Korea Multimedia Society
• /
• v.25 no.6
• /
• pp.866-877
• /
• 2022

With respect to the advent of realistic media, the so-called future cinema theory or the theory of the end of cinema that cinema will be transformed by the advent of realistic media, or that realistic media will expel film media and replace them are being put forward as if they were orthodoxy. Therefore, this paper argues that the future cinematic theory and the theory of the end of cinema the cinema are inferred from the false premise that the superiority and inferiority relationship and substitute relationship established only between video media of the same type with the same properties are also established even between realistic media and film media, which have different properties. And it is concluded that realistic media and film media will coexist because they have different properties, functions, uses, and utilities.

• Journal of Korean Society of Steel Construction
• /
• v.23 no.3
• /
• pp.261-273
• /
• 2011

Recently, the demands for steel frame are increasing because of the trend and due to the demand for bigger and higher buildings. In the analysis of typical steel frame, connections are based on the idealized fixed or pinned connection. A fixed connection assumes that the relative angle of each member before deformation is the same after the transformation. Therefore, the stiffener reinforces the connection to sufficient rigidity and stability of the panel zone. In the economical aspect, however, the necessity of connection that the stiffener reinforcement has omitted is increasing due to the excessive production as well as labor costs of connection. In contrast, pinned connection is assumed that bending moments between the beams and columns do not transfer to each member. This is easy to make in the plant and the construction is simple. However, the structural efficiency is reduced in pinned connection because connection cannot transfer moments. The introduction of this semirigid process can decide efficient cross-sectional dimensions that promote ease in the course of structural erection, as performed by members in the field-a call for safety in the entire frame. Therefore, foreign countries exert efforts to study the practical behavior and the results are applied to criterion. This paper analyzes the semirigid connection of domestic steel by design specifications of AISC/LRFD and make data bank that pertain to each steel. After wards, the results are compared to those of idealized connection; at the same time, this paper presents a design method that matches economic efficiency, end-fixity, and rotational stiffness.