• (The)Study of the Eastern Classic
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• no.70
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• pp.33-58
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• 2018

The purpose of this paper is to clarify the life and poetry of Dokshok Hwang Hyok. In Chapter 2, we looked at the life of Hwang Hyok. There are two characteristics in the life of Hwang Hyok. First, Hwang Hyok had excellent literary talent. Secondly, Hwang Hyok wrote in an attempt to surrender during the Japanese Invasion of Japan. That is why he lived a 21 year detained life. In Chapter 3, we looked at poetry based on the life of Hwang Hyok. The features of poetry are as follows. First, the image of Somu and reality of Tiger and Dhole go around. Hwang Hyok lived a confined life because of the Japanese Invasion of Korea. Because of that, Hwang Hyok recognized the Japanese invasion of the Imperial Japan as a world where Dhole and tigers travel around. It symbolized the image of Sommu that he did not surrender. Second, Changsha, is the world and Gulwon images. Changsha is Gulwon the space of self-destruction. Hwang Hyok likened his dark life to Gulwon dead. This is because Hwang Hyok's life is similar to Gulwon's life. In other words, Hwang Hyok was most appropriate to compare his tough life to Gulwon, who drowned in Myeoglasu.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2003.10a
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• pp.85-85
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• 2003

• Clinics in Shoulder and Elbow
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• v.18 no.3
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• pp.167-171
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• 2015

Humeral head chondrolysis has been widely reported as a devastating complication after arthroscopic shoulder surgery; however little is known about post-arthroscopic humeral head osteonecrosis. We experienced a 66-year-old female patient with rapidly progressive osteonecrosis of the humeral head only seven months after arthroscopic Bankart and rotator cuff repair. The patient had no systemic risk factors for osteonecrosis. A satisfactory result was achieved with reverse total shoulder arthroplasty for severe humeral head destruction and an irreparable massive rotator cuff tear. Shoulder surgeons should be aware of such severe complication, perform routine radiographs, and pay close attention to the presence of constant pain or loss of motion after arthroscopic shoulder surgery.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.109-112
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• 1997

A Discrete Event Dynamic System is a system whose states change in response to the occurrence of events from a predefined event set. A major difficulty in developing analytical results for the systems is the lack of appropriate modeling techniques. This paper proposes the use of Real-time Temporal Logic as a modeling tool for the modeling and control of fixed-time traffic control problem which by way of a DEDS. The Real-time Temporal Logic Frameworks is extended with a suitable structure of modeling hard real-time constraints. Modeling rules are developed for several specific situations. It is shown how the graphical model can be translated to a system of linear equations and constraints.

• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.119-121
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• 2007

PID control is windely used to control stable processes, however, its application to integrating processes is less common. In this paper, we proposed a simple PID controller tuning method for integrating processes with time delay to meet a sensitive function $M_s$. With the proposed PID tuning method, we can obtain stable integrating processes using PD controller in inner feedback loop and a loop transfer function with desired stable specification. This guarantees both robustness and performance. Simulation examples are given to show the good performance of the proposed tuning method to other methods.

• Proceedings of the KIEE Conference
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• 1998.07b
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• pp.775-777
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• 1998

The Ziegler-Nichols parameter tuning has been widely known as a fairly heuristic method to good determine setting of PID controllers, for a wide range of common industrial processes. We extract process knowledge required for rule base controller through tuning experiment and simulation study, such as set point weighting and normalised gain and dead time of process. In this paper, we presents a rule base PID controller by extracted process knowledge and the modified Ziegler-Nichols tuning. Computer simulation are provided demonstrate the feasibility of this approach.

• Proceedings of the KIEE Conference
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• 1997.07b
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• pp.590-592
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• 1997

A Discrete Event Dynamic System is a system whose states change in response to the occurrence of events from a predefined event set. A major difficulty in developing analytical results for the systems is the lack of appropriate modeling techniques. This paper proposes the use of Real-time Temporal Logic as a modeling tool for the analysis and control of DEDS. The Real-time Temporal Logic Frameworks is extended with a suitable structure of modeling hard real-time constraints. Modeling rules are developed for several specific situations. It is shown how the graphical model can be translated to a system of linear equations and constraints.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.11
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• pp.2010-2016
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• 2007

PID control is windely used to control stable processes, However, its application to integrating processes is less common. In this paper, we proposed a stable PID controller tuning method for integrating processes with time delay using model reduction method. For proposed model reduction method, it disconnect an integrating factor from integrating processes and reduces separate process using reduction method. and it connect an integrating factor to reduced model. We can obtain stable integrating processes using P controller in inner feedback loop and PID tuning is then used to cancel the pole of the feedback loop. This guarantees both robustness and performance. Simulation examples are given to show the good performance of the proposed tuning method comparing with other methods.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2230-2232
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• 2003

One of the important problems in a control system design is the requirement that the system should have adequate relative stability. In this paper, We proposed a tuning algorithm PI controller for first order plus dead time system. It is determined the domain of the PI control parameters by Routh - Hurwitz criterion, and we tune parameters of the PI controller using genetic algorithm. A numerical example is also given to illustrate the method.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2221-2223
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• 2003

다양한 공정에 범용 적으로 적용할 수 있는 PID 제어기 동조 방법이 많이 연구되고 있다. 한 가지 방법으로서 실제공정에 대한 축소모델을 구하고 축소모델로부터 파라메터를 동조하는 방법이 사용되고 있다. 본 논문에서는 시간응답으로부터 최소 자승법을 이용하여 고차 시스템을 2차계로 축소하는 방법을 제안하였다. 2차계 시스템을 차분 방정식으로 표현하고, 시간응답의 입출력 데이터로부터 최소 자승법을 이용하여 차분 방정식의 계수를 구하였다. 차분 방정식을 이산시간상태방정식으로 변환, 이산시간 상태방정식을 연속시간 상태방정식으로 변환하는 과정을 유도하여, 차분 방정식의 계수로부터 연속시간 상태방정식을 구하는 방법을 제시하였다. 시뮬레이션을 통하여 축소모델의 정확성 및 실제공정과의 특성을 비교하였다.