• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.47-50
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• 1991

LPM(Linear Pulse Motor) provide direct and precise position control of bidirectional linear motion. LPM is not subject to the same linear velocity and acceleration limitations inherent in systems converting rotary to linear motion such as lead screws, rack and pinion, belt and pulley drives. With LPM, all the thrust force generated by the motor is efficiently applied directly to the load. And speed, distance, and acceleration are easily programmed in a highly repeatable fashion. Potential industrial and application fields of LPM include PCB assembly, industrial sewing machines, automatic inspection, coil winder, medical uses, conveyer system, laser cut and trim systems, semiconductor wafer processing, OA instruments etc. This paper describes various design parameter of LPM such as magnetic ciucuit construction methods, phase number and tooth number per pole, permanent magnet and coil mmf, tooth geometries. And to solve the problems of existing control methods, in this paper, a new control method of the LPM is proposed throughout modern control theory.

• 영어영문학
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• 제64권4호
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• pp.651-672
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• 2018

Death of a Salesman is centered on Willy Loman trying to achieve the American dream and taking his family along for the ride. This paper explores the meaning of his suicide in the work through the Adorno's theory on the individual's reification and commodity by an exchange value in the capitalism and argues that Bourdieu's capital classification shows the cause of his tragic decision. Reification refers to "the structural process whereby the commodity form permeates life in capitalist society." and Adorno called the reification of consciousness an epiphenomenon. The social-psychological level in Adorno's diagnosis serves to demonstrate the effectiveness and pervasiveness of late capitalist exploitation. According to Bourdieu, cultural capital can exist three forms: in the embodied state, in the objectifed state and in the instituionalized state. He states embodied capital is argued to be the most significant influence; however unlike other forms of capital (social, economic, etc.) obtaining embodied capital is largely out of the individuals' control as it is developed from birth. In conclusion, I suggest Death of a Salesman can be interpreted as a text criticizing the internalization of the subject, which is the result of the self-destructive mechanism of the subject in the logic of modern subject formation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.342-345
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• 2005

This paper describes dynamics analysis of a small training boat and a new type of ship's autopilot not only to keep her course but also to reduce her roll motion. Firstly, statistical analysis through multi-variate auto regressive model is carried out using the real data collected from the sea trial on an actual small training boat Sazanami after the navigational system of the boat was upgraded. It is shown that the roll motion is strongly influenced by the rudder motion and it is suggested that there is a possibility of reducing the roll motion by controlling the rudder order properly. Based on this observation, a new type of ship's autopilot that takes the roll motion into account is designed using the muti-variate modern control theory. Lastly, digital simulations by white noise are carried out in order to evaluate the proposed system and a typical result is demonstrated. As results of simulations, the proposed autopilot had good performance compared with the original data.

• Journal of information and communication convergence engineering
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• 제11권1호
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• pp.56-61
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• 2013

Modern integrated circuits (ICs) are becoming an integrated parts of analog, digital, and radio frequency (RF) circuits. Testing these RF circuits on a chip is an important task, not only for fabrication quality control but also for tuning RF circuit elements to fit multi-standard wireless systems. In this paper, RF test circuits suitable for embedded testing are introduced: RF power detectors, power control circuits, directional couplers, and six-port reflectometers. Various types of embedded RF power detectors are reviewed. The conventional approach and our approach for the RF power control circuits are compared. Also, embedded tunable active directional couplers are presented. Then, six-port reflectometers for embedded RF testing are introduced including a 77-GHz six-port reflectometer circuit in a 130 nm process. This circuit demonstrates successful calibrated reflection coefficient simulation results for 37 well distributed samples in a Smith chart. The details including the theory, calibration, circuit design techniques, and simulations of the 77-GHz six-port reflectometer are presented in this paper.

• 도시과학
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• 제9권1호
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• pp.75-90
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• 2020

Günter Behnisch is one of the architects who played a major role as a pioneer of German modern architecture after World War II. After experiencing the era of the oppression of the Nazi right-wing national socialist, he tried to break away from the high-pressure and arrogant architecture to control everything in the building and to create a building that was born in a democratic way of thinking. He thought that architecture showed us the way we treat ourselves and the world, and that architecture formed our world view backwards. In this way, architects can express their way of thinking about their society through their works. Behnisch judged that the educational facility was the most appropriate use for implementing his democratic mindset. He hoped that this would give students the characteristics of democracy through architecture. Schools are a place where small society is experienced, and it is thought to be a medium for him to implement democratic thinking in school architecture. This study analyzed the educational facilities of Behnisch by deriving the analysis elements through the educational space organization reflecting Prakash Nair's educational facilities and educational theory and his architectural philosophy. The various plans, sections and spaces, which are characteristics of the his school facilities analyzed in this study, are expected to be helpful as data for presenting variety to many educational facilities in Korea.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.185-188
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• 2009

이 논문에서는 PID 알고리즘을 이용하여 시소 시스템의 균형을 위한 위치 제어기를 설계하고자 한다. 시소 시스템은(Seesaw System) 선박 및 항공 역학, 도립진자, 각종 분석, 로봇 시스템 등의 해석에 광범위하게 응용되는 시스템이자 현대 제어 시스템의 이론과 각종 응용문제를 취급할 수 있는 장치이다. 시소 시스템의 경우 시스템이 비선형성이 강한 제어 대상이므로 시스템의 이해와 해석, 그리고 파라미터의 정확한 선정이 필수요소이다. 사용할 시스템 제어 알고리즘에는 간단하고 오랜 역사를 통해 안정성이 보장된 PID 알고리즘과 정확하고 빠른 PID 파라미터 동조에 필요한 연산 최적화 알고리즘인 PSO(Particle Swarm Optimization) 통해 외란이나 제어기의 변화에 빠르게 적응할 수 있도록 하여 성능과 안정성을 보장한다.

• 한국지능시스템학회논문지
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• 제25권4호
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• pp.319-326
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• 2015

최근들어, 확률론적 최적제어(stochastic optimal control) 및 강화학습(reinforcement learning) 분야에서는 데이터를 활용하여 준최적 제어 전략을 찾는 문제를 위한 많은 연구 노력이 있어 왔다. 가치함수(value function) 기반 동적 계획법(dynamic programming)으로 최적제어기를 구하는 고전적인 이론은 확률론적 최적 제어 문제를 풀기위해 확고한 이론적 근거 아래 확립된바 있다. 하지만, 이러한 고전적 이론은 매우 간단한 경우에만 성공적으로 적용될 수 있다. 그러므로, 엄밀한 수학적 분석 대신에 상태 전이 및 보상 신호 값 등의 관련 데이터를 활용하여 준최적해를 구하고자 하는 데이터 기반 현대적 접근 방법들은 실용적인 응용분야에서 특히 매력적이다. 본 논문에서는 확률론적 최적제어 전략과 근사적 추론 및 기계학습 기반 데이터 처리 방법을 접목하는 방법론들을 고려한다. 그리고 이러한 고려를 통하여 얻어진 방법론들을 금융공학을 포함한 다양한 응용 분야에 적용하고 그들의 성능을 관찰해보도록 한다.

• 한국경영과학회지
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• 제17권2호
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• pp.45-54
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• 1992

It become increasingly important to design user interface to carry low complexity. The cognitive limitations of users severely restrict utility of highly intelligent but complex modern systems. Since humans are known to use schemas to reduce cognitive complexity, imposing good consistency to an interface design that may help that user form useful schemas will provide powerful control over the complexity. This present a research effort to develop a quantitative method for evaluating interface complexity that the user would experience planning his or her course of action. Taking into account the user's potential schemas, a quantitative measure based on information theory was develped to assess the navigational complexity. This approach does not rely on the subjective judgment of the researcher as most schemes dealing with user schemas do. The proposed method may benefit the rapid prototyping approach to design a better user interface by allowing handy assessment of the design.

• 한국시스템다이내믹스연구
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• 제2권1호
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• pp.93-112
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• 2001

Inter-Organizational Cooperation is the most common and important strategy in modern public and privet sectors managerial activities. In this paper the concepts of inter-organizational cooperation means not selfish cooperation as in the game circumstance and theory, but general collaborative action between organizations, they have share same goal. The achievement level of jointed-goal of inter-organization is depended upon the performance of cooperation, which resulted from the conditions and circumstances of cooperation. This paper analyses the effect of inter-organizational cooperation on achievement level of the jointed goal between two organizations with computer simulation model of the system dynamics approach. In the computer simulation model, three factors, goal perception, communication, and control, are considered as a key conditions of cooperation, which impact on the performance of cooperation. Simulation model was constructed with focus on the dynamic interactions between these three factors and the achievement level of jointed-goal. Consequently, the results found in this paper may provide further grounds for reducing the time delay that included in the conditions of cooperation.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제8권4호
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• pp.264-269
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• 2008

In this paper, two neural networks as a material model, which are based on the state-space method, have been proposed. One outputs the rates of inelastic strain and material internal variables whereas the outputs of the other are the next state of the inelastic strain and material internal variables. Both the neural networks were trained using input-output data generated from Chaboche's model and successfully converged. The former neural network could reproduce the original stress-strain curve. The neural network also demonstrated its ability of interpolation by generating untrained curve. It was also found that the neural network can extrapolate in close proximity to the training data.