• Journal of Science of Art and Design
• /
• v.5
• /
• pp.5-34
• /
• 2003

This study aims at the observation of some analytical levels-especially those of syntactico-semantical- of the visual expressions in general. As far as the syntactical parts are concerned, there were two steps to be approached. One is to select the paradigms according to the Saussure-Hambidgean suggestions, the other to derive syntagmas from what is called the 'chaos-system', one of nonlinear dynamics. In result, paradigms could be acquired 5 sorts with its so many varieties, as visual templates(VT), supplemented by their reciprocals(R) and complements(CLE), and syntagmas five orbits from each constant c=0 to c=10. In additional, in connection with semantic parts, the study introduced a Gremasian model of discourses and narratives for the interpretation of signifiers. By this, we could cover the conjunctive relationships(+) and the disjunctive(-) of the whole structure of visual expression. Finally, we certified that the above could be fully approved in terms of recent worldly cognitive scientic psychological discoveries.

• Journal of the Korean Chemical Society
• /
• v.25 no.5
• /
• pp.291-299
• /
• 1981

A test particle kinetic theory for reaction dynamics in liquids is presented at the repeated ring collision level for the hard sphere model. A kinetic equation for the equilibrium time correlation function of the reactive test particle phase space density is derived and the rate kernel expression for the reversible chemical reaction of the type A +B ${\rightleftharpoons$ C + D in the presence of inert solvent S is obtained by the projection operator method.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.5 no.3
• /
• pp.36-51
• /
• 1995

An approach to robot hybrid position/force control, which allows force manipulations to be realized without overshoot and overdamping while in the presence of unknown environment, is given in this paper. The manin idea is to used dynamic compensation for known robot parts and fuzzy compensation for unknown environment so as to improve system performance. The fuzzy compensation is implemented by using rule based fuzzy approach to identify the unknown environment. The establishment of proposed control system consists of following two stages. First, similar to the resovled acceleration control method, dynamic compensation and PD control based on known robot dynamics, kinematics and estimated environment stiffness is introduced. To avoid overshoot the whole control system is constructed with overdamping. In the second stage, the unknown environment stiffness is identified by using fuzzy reasoning, where the fuzzy compensation rules are obtained priori as the expression of the relationship betweenenvironment stiffness and system. Based on the simulation result, comparison between cases with or without fuzzy identifications are given, which illustrate the improvement achieced.

• 제어로봇시스템학회:학술대회논문집
• /
• 2001.10a
• /
• pp.50.2-50
• /
• 2001

Optimal control problems are notoriously difficult to solve either analytically or numerically except for limited cases of having simple dynamics. Evolutionary programming is a promising method of solving various optimal control problem arising in practice since it does not require the expression of Lagrange´s adjoint system and that it can easily implement the inequality constraints on the control variable, In this paper, evolutionary programming is combined with spline method, so the smoother control profile and the Jumping times could be obtained. The optimal profiles obtained by the proposed method are compared with exact solution if it is available. With more complicated model equation, the proposed method showed better performance than other researchers´. It is demonstrated that the evolutionary programming with spline method can ...

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.15 no.3
• /
• pp.24-29
• /
• 1978

A new mode of operation is observed in this paper which involves the tractive wave interaction between a cyclotron ways and a synchronous electron beam. The wave interaction is analysed by using both electron dynamics and coupled-mode methods. The gain expression derived from the analysis prognoses a new type of improved uhf amplifier with low noise and high power. Based on the theoretical analysis, experimental tubes have been designed, constructed arid exporimented. As a result, a low noise amplifier is anticipated well into millimeter lave region.

• 제어로봇시스템학회:학술대회논문집
• /
• 1992.10b
• /
• pp.229-234
• /
• 1992

This paper presents a compensator design method for multivariable feedback control systems with saturating actuators based on the concept of the equilibrium point. Am explicit expression for the compensation matrix of the general anti-reset windup(ARW) scheme is derived by minimizing the distances between the equilibrium points. The resulting dynamics of the compensated controller exhibits the reduced model form of the unsaturated system which can be obtained by the singular perturbational method. The proposed method is applicable to any open-loop stable plants with saturating actuators whose controllers are determined by some design technique. An example is given to show the effectiveness of the proposed method.

• 제어로봇시스템학회:학술대회논문집
• /
• 1990.10b
• /
• pp.907-912
• /
• 1990

An approach to robot force control, which allows force manipulations to be realized without overshot and overdamping while in the presence of unknown environment, is given in this paper. The main idea is to use dynamic compensation for known robot parts and fuzzy compensation for unknown environment so as to improve system performance. The fuzzy compensation is implemented by using rule based fuzzy approach to identify unknown environment. The establishment of proposed control system consists of following two stages. First, similar to the resolved acceleration control method, dynamic compensation and PID control based on known robot dynamics, kinematics and estimated environment compliance is introduced. To avoid overshoot the whole control system is constructed overdamped. In the second stage, the unknown environment stiffness is estimated by using fuzzy reasoning, where the fuzzy estimation rules are obtained priori as the expression of the relationship between environment stiffness and system response. Based on simulation result, comparisons between cases with or without fuzzy identifications are given, which illustrate the improvement achieved.

• Journal of Astronomy and Space Sciences
• /
• v.14 no.2
• /
• pp.355-366
• /
• 1997

This paper presents a comprehensive analytical approach for determining key maneuver parameters associated with the acquisition and maintenance of the ground track for a low-earth orbit. A livearized model relating changes in the drift rate of the ground track directly to changes in the orbital semi-major axis is also developed. The effect of terrestrial atmospheric drag on the semi-major axis is also explored, being quantified through an analytical expression for the decay rate as a function of density. The non-singular Lagrange planetary equations, further simplified for nearly circular orbits, provide the desired relationships between the corrective in-plane impulsive velocity increments and the corresponding effects on the orbit elements. The resulting solution strategy offers excellent insight into the dynamics affecting the timing, magnitude, and frequency of these maneuvers. Simulations are executed for the ground track acquisition and maintenance maneuver as a pre-flight planning and analysis.

• Journal of Korean Home Economics Education Association
• /
• v.12 no.3
• /
• pp.183-194
• /
• 2000

The purpose of this study was to investigate the dynamics of dating violence among male and female adolescents. Out of 1205 high school students. 90.6%(n=1092) was included for the final analysis. 120 students(11.9%) reported to have experienced physical violence with a dating partner at least once or more. The most frequently used forms of violence were pushing and grabbing. Both of aggressors and victims interpreted the violence as an expression of love and affection. Coping behavior of victims were quite passive, while aggressors tried to apologize and to make-up. Most of victims were angry about violence. while aggressors felt sorry for their behavior. 72.5% of respondents reported that the relationship remained unchanged or got better after the violence. while 26.7% answered their relationship was terminated or got worse. 157 respondents(14.4%) reported to have experienced psychological violence at least once or more. Shouting and insulting language or behavior were most frequently used. Coping behavior of victims was mostly negotiation and communication. Based on the findings of this study, suggestions were made in regard to student guidance and counseling for dating aggression.

• Journal of Families and Better Life
• /
• v.14 no.1
• /
• pp.187-197
• /
• 1996

The purpose of this study is to investigate the incidence and dynamics of permarital abuse among never-married college students. 21.3% of 497 male and female respondents reported that they had experienced premarital violence at least once. Types of violence most frequently used were pushing or shoving slapping and throwing objects. It is interesting that both victims and aggressors interpret violent acts as expression of love most of all. Behavioral response to violent acts were to try to make up to talk to the partner and to apologize. In general the respondents had negative attitudes toward violence in premarital and marital relationships. Males showed more positive attiutudes toward violence than females. This sex difference appeared to have some inflence on marital abuse, In is suggested that counseling program and shelter for victims of severe violence need to be developed.