高分子電氣絶緣材料의 絶緣壽命에 관한 硏究

李愚宣,鞠相勳,劉炳守,鄭憲相,金昌錫,崔昌柱,李相一,尹雄烈,白亨來,趙範峻,曹錦培,崔漢秀 朝鮮大學校 動力資源硏究所 1982 動力資源硏究所誌 Vol.4 No.1

T'he electrical insulative life of cross-linked polyethylene used as an insulating material in power cable is predicted in this paper. The experiment is progressed velocity theoretically. In this experiment, supplied experimental voltage under the condition of equivalent temperature, and then Arrhenius equation is applied. To get the span of life vs. temperature characteristics, the relation between the logarithm value of life and the reciporical of temperature are extended as a straight line, after that the span of life is predicted. In case of raising the temperature of sample linear type, to get the breakdown temperature vs. raising velocity of temperature characteristics, after developed the Arrhenius equation a little more, Predcted the span of life about cross-linked polyethylene semi-theoreticalliy. The results of this experiment are as follows: 1) The experimental values for the prediction of the span of life between at the case of equivalent tamperature and variable temperature are a little different. 2) The phenomenon of insulation breakdown which is based upon Tree breakdown can get by ineans of the velocity theory. 3) To get the life characteristics, the velocity theory is applied, The theoretical values and experimental values are aimost equal. Therefore, the propriety ut above method is confirmed

2相流體 複合 Cycle의 動力裝置에 關한 硏究

河鈺男 조선대학교 동력자원연구소 1990 動力資源硏究所誌 Vol.12 No.2

The ideal Rankine cycle is generally empoloyed by engineers as a standard of reference for comparing the Performaance of actual steam engines and steam turbin. The Joule cycle, also called Brayton cycle, consosts to two lsentropics and two constant Pressure lines. The Joule eycle has assumed renewed importance as a basis for analysis of gas turbine operation. A studied results in view of thermo-engineering odjection in the two Phase-fluid flow of compound cycle to use power plant is presented in this paper.

Camera space manipulation

Cho, Gyu Jae 조선대학교 동력자원연구소 1988 動力資源硏究所誌 Vol.10 No.1

최근엔 시각적으로 측정되는 정보를 포용할 수 있는 Robotic System이 개발되고 있다. 이런 이유로 본논문에서는 Vision system내에서 Camera의 위치와 manipulator의 동력학적 model을 근거로 실험을 통하여, 한정된 평면 궤적을 그리는 상태를 camera와 manipulator을 병열로 놓고 측정함으로써 camera가 manipulator 조정을 위한 정보를 얻고자 하였다. 결과적으로 Camera와 manipulator의 위치를 동작기구의 작동을 통하여 Real-time내에 형성된 algorithm을 계산함으로써 궤적을 찾을 수가 있었다.

多關節 로보트 設計

韓承朝 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.1

Mechatronic engineering have made remarkable progress by developement of mechanics and electronics in recent. This paper reports a design and fabrication of a multijoint robot using a microprocessor (6502) and stepping motors. To put it concretely, in the hardware, interface which acts stepping motors was made and in the softwae, a machine language program which controls stepping motors and a simulation program was constructed.

가솔린 機關의 點火時期가 排氣가스에 미치는 影響

오환교,이종인 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.2

The summarized results as follow. Electronic Control System varied Spark plug Gap, and rpm, and catalyst apparatus, CO ,HC exhausted less and made the optimum control of the air-fuel ratio. In case of the Spark Plug Gap 1.0mm, Spark Timing 15 degree and rpm 3000. Exhaust gas such as CO, HC reduced and Electronic control Engine of feed back control was effective in the spark timing control and reduced the amount of CO, HC but carburetor didn't work on the same way.

위상각 가변에 의한 단상유도전동기의 기동특성

이상일,임양수 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1

The most common starting method of the single phase induction motor(SPIM) is to install a starting condenser and a centrifugal switch in series with the auxiliary winding. Even though this condender start method is embodied simply, it is feasible because of motor failure from malfunction of the centrifugal switch and the starting condenser. Moreover, it is hard to improve the performance characteristics of the SPIM. In this paper, the starting charcteristics of SPIM is improved by phase control strategy of auxiliary winding in removing a starting condenser and a centrifugal switch. Finally, the excellent starting performance of SPIM is shown through simulation and experimental results.

태양광 발전 시스템의 최적화를 위한 컴퓨터 시뮬레이션

조금배,최연옥,최송철,김동휘,장용해,박인준 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.2

The primary concern in designing any PV system is the determination of its optimum size. It is generally inadequate to use monthly or daily average insolation, and estimated number of continuous no sun days to determine array and battery capacities because the dynamic behavior of PV system and the stochastic nature of solar radiation also significantly influence the required array and storage capacity. Simulation method uses hourly meterological data and hourly load data to simulate the energy flow in a PV system, and predicts the system reliabilities under assumed array and battery size. This paper choose the loss of load hours as the system reliability index, and considers a residential system which consumes 2 kwh of electricity per day, as a case study. The meteorological data for the simulation are on data in Korea.

直交異方性 CFRP 積層材의 衡擊損傷에 關한 硏究

심재기,양인영,조규재 조선대학교 동력자원연구소 1994 動力資源硏究所誌 Vol.16 No.1

In this study, When CFRP composite laminates involved difference of stacking sequences and kinds of matrices are subjected to transverse impact, An experimental study was performed by observing the following items; a) interrelations between the impact energy vs. delamination area vs. the residual bending strength. The results were summarized as follows; 1. It is found that orthotropic laminate materials are all increasing lineally between impact energy and damage delamination area. 2. Delamination development energy of CF/EPOXY laminated materals, that is, slope of delamination area by impact energy is lower than that of CF/PEEK (orthotopic laminated materals). 3. CF/EPOXY specimens D of laminated orientation (0°_4/90°_4)_sym. shows that impact damage of impacted-side compression is higher than that of impacted side tension, whereas CF/PEEK specimen P with the same stacking sequences indicates that impact damage of impacted-side tension is higher than that of impacted-side compression, for delamination buckling is generated at delamination area of interface B subjected to compression.

객체 지향 데이터베이스 시스템에 있어서 불완전 정보 표현에 관한 연구

최우진,노경완,이광,이호영,오무송 조선대학교 동력자원연구소 1994 動力資源硏究所誌 Vol.16 No.1

Object-Oriented data model provides possibility of various types of utilization of information in a real world, therefore database system should have a cpapbility of incomplete information management. In this paper, we defines a object-oriented data model using O_2 object-oriented database system and suggested some representation of ambiguous value based on preceded studies about it. O_2 is object-oriented : Information is organized as object which have an identity and encapsulate data and behavior. We have shown that ambiguous value can be expressed within an object instance using null value and some interesting analogies are shown in the way that nested relational data model and the object-oriented model express empty set.

MHS에서 공개 키를 이용한 신분확인 RSA 수행 알고리즘에 관한 연구

김학춘,박종선,김광준,정찬주,박은경,오순탁,나상동 조선대학교 동력자원연구소 1994 動力資源硏究所誌 Vol.16 No.1

Massage processor system which is serviced electronic mail system and various services using communication already entered popularization. The important thing of these is security problem for massage detection. Thus this paper analysises organization of CCITT X.400 standard and services or arguments which are associated with MHS(Massage Handling System) security and proposes both algorithm of identity confirmation and method of key management using the public-key.