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國語語彙意味의 統合과 分化 : 慶南方言을 中心으로 With Focus on the Kyung-nam Dialect
金亨柱 동아대학교 어학연구소 1984 언어와 언어교육 Vol.1 No.1
This paper attempts to reveal how diversely the meanings of words are divided and synthesized in different dialects even within a limited area. If the area of research is broadened, the diversity will be even greater. The study of contemporary Korean must be a study of living dialects. Therefore the study of diverse lexical meanings in different areas is no less important than the study of phonological and morphological aspects, and such a study should be systematizd. The phenomena revealed are as follows: 1. There are cases in which two or more concepts are synthesized into one. 2. There are cases in which a single concept is divided into two or more. 3. Some pairs of synonymous words are used as non-synonyms. 4. There are cases in which several words refer to similar objects, and so they form a group. It is true according to the cultural and sociological development which has occurred, the diversification of meanings in language enables us to satisfactorily express our thoughts and emotions. On the other hand, it can be said that, in some aspects, the difficulty of language expression becomes greater, because there are cases in which words denoting several meanings in the past are now synthesized into a single concept.
정형환,주수원,이광우 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2
This model is built up according to the ecologic relationships between different epidemiological types of individuals. A Markovian process is associated to the epidemic control process with a finite number of states and a discrete time. {Y_(t), t≥0} The quantitative aspect of the model was characterized by digital computer simulation.
誘起電壓 檢出에 의한 無整流子電動機의 始動에 관한 硏究
정형환,주수원,이권순 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2
Today, the commutatorless motor is widely sued and studided. And, the driving methed is presented. The natural commutation using the thyristor invertor is not needed the supplementary circuits and simplified the control circuits Therefore, it is expected that the reliability is increasing But, the main defects of the motor is needed the position detecting devices attached to the motor outside And, certain mechanical attachment errors affect the output and efficiency of the motor Therefore, this paper proposes the motor driving techniques without the using of the supplementary devices. With the detection of inducing voltage, control of thyristor and zero-crossing signals, it is achieved Also, it is stable and practicable in a whole ranges.
정형환,주석민,이광민 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-
This paper proposed a regulation technique of scale factors on fuzzy controller for power system stabilization. These scale factors are regulated by a given exponential function with performance index variables. Simulation results showed that the proposrd fuzzy control technique was more powerful than conventional ones in faces of usefulness and robustness.
상태 가중치 개선에 의한 교류-직류 연계계통의 동태안정도에 관한 연구
정형환,안병철,왕용필 東亞大學校 1995 東亞論叢 Vol.32 No.-
In this paper, a dynamic state equation is constructed in order to get an optimal control signal for stabilization of a power system. Co-state matries to each of its coefficient matrices are also found. According to these matrices, eigenvalue, eigenvalue sensitivity and state weighting are calculated and the riccati equation is constructed. The control signal is determined by the roots of the equation and during this process, state weighting are adjusted to the shift of dominant eigenvalue until optimal one can be found. The resultant optimal controller, which is obtained by the process mentioned above, is applied to A.C. only and A.C - D.C. power systems. The dynamic stability of voltage and frequency of the power system with disturbances is considered.
정형환,안병철,허동렬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
This report has been suggested a calculation method include the DC-Link equations into process of power flow repetition of AC system, on to use the fast decoupled method. The DC link model which consisted of thirteen non-linear equations could be expressed using nine non-linear equations in accordance with the consideration of system configuration and functional characteristic. In recognition of the advantage for DC transmission on a side of elevation upon an economical transmission through a lower loss and a stability enhancement, the estabishment of real system and this study are doing to activate in the world. Also in our land, the DC transmission between the shore and Jae-Ju Province is going to expedite in actual fact. Such as fact in today, it has been done to think that is meaningful to exhibit the effective power flow for advactage fo a memory capacity, a calculatot's speed, and can be known the electric power distributions of integrated AC-DC system.
鄭亨煥,周秀元,李浚柝 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.1
A newly derived O₂ Saturation Model which can adapted to the design and study of Artificial Lung and Blood Gas Calculator etc. is introduced on the of Electrical Equivalent Circuits. The presented 4 stage and 2 stage RC circuits have good correlations with actual chemical reactions of Hemoglobin and Oxygen. However from the results of computer simulations, 2 stage equivalent model is more accurate than 4 stage and conventional O₂ saturation models.
신경회로망 자기동조 PID 제어기를 이용한 전력계통 안정화에 관한 연구
정형환,김상효,이정필,정문규 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
This paper applied the neural network self-tuning PID controller to its linearized one-machine infinite bus for improvement in the power system stabilization. It ia tried to regulate the optimum parameters of the PID Controller using the learning algorithm of error back propagation. The simulation results show that the proposed control technique is decidedly superior to the conventional ones in dynamic responses about various disturbances arising in the power system.
鄭亨煥 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.2
This paper describes a simple, very reable and extremely fast load-flow solution method with a wide range of practical application. It is attractive for accurate or approximate off-and on-line routine and contingency calculations for network of any size, and can be implemented efficiently on computers with restrictive corestore capacities.