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Porter의 산업구조분석모형을 이용한 TFT-LCD 사업매력도 분석
이선규,이웅희,서명지,허연호,홍민정 금오공과대학교 산업기술개발연구원 2001 産業技術開發硏究 Vol.17 No.-
This study examined the key success factors and the degree of industry attractiveness in the TFT-LCD industries. The five competitive force factors include: barriers o entry, industry rivalry, threat of substitutes, supplier power and buyer power. As the result of this study, it was found that the key success factors were customer needs, high screen quality, low price, high performance, convenience and stability concerning with display device. This study provides another link in the chain of understanding of the industry attractiveness and key success factors in the TFT-LCD markets.
유동방향 분산효과를 고려한 밀집형 열교환기내 열전달계수와 유동방향 분산계수의 예측에 관한 연구
홍택,박상희,박병규 金烏工科大學校 産業技術開發硏究院 1999 産業技術開發硏究 Vol.15 No.-
A periodic transient test technique based on the axial dispersion model is investigated for the simultaneous determination of both heat transfer coefficients and axial dispersion coefficients in heat exchanger It takes both axial dispersion in the fluid and axial heat conduction in the wall into account. The results of complex Fourier transform technique are compared with those of finite difference method. The predictions conducted on a flat plate array show that axial dispersion has a small effect on the temperature response at the heat exchanger outlet. It show that the finite difference method is better than the complex Fourier teansform technique in view of time saving and accuracy.
면방전 AC PDP에서 콘트라스트 개선을 위한 구동 파형과 회로설계
안양기,윤동한,김태형 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
This paper proposes a method to drive an AC plasma display panel(PDP) with a significantly improved contrast ratio. In the proposed method, during the first sub-field of one frame, all PDP cells are reset by the ramp waveform, and during the other sub-fields, only the cells turned on in the previous sub-field are reset. No light is emitted during the reset period of every sub-field except the first sub-field. For a 10-bit picture, the luminance of the dark level for the proposed method is 10 times lower than that for the conventional method, in which the ramp waveform for the reset is used in every sub-field. Accordingly, the contrast ratio for the proposed method is 10 times higher than that for the conventional method. For the 10-bit picture, the measured contrast ratio was about 3080:1 for the proposed method and about 185:1 for the conventional method, resulting in 10.8 times increase in the contrast ratio. This result shows that the proposed method can realize an image with high contrast ratio.
최광영,김상희,박원우 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
The SOFM(Self Organize Feature Map) is used many fields on pattern recognition and image compression because of it's simple structure. But it's learning process is complex and takes a long time for searching whole weights. This paper propose an improved SOFM algorithm to decrease learning period and to increase PSNR. The proposed SOFM has two processes : appling hierarchical structure, and learning to set sub-level structure and initializing sub-level weights. The improved SOFM algorism is applied to image compression and restoration.
신호균 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
This paper reviews rural informatization strategies for building digital Gyeongbuk by informatization of rural administration, society, industry, and life sectors. As activating policy is transformed into economizing policy for successful implementation of these strategies by utilizing rural resources, the concepts such as agri-business, precision farming, and knowledge management farming are emerging as major competitive forces for building digital Gyeongbuk in agricultural area. Also, it is necessary to practically support the linkage of rural and urban policy for reducing digital divide and encouraging diffusion of informatization mind
신동원,박종천 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
This paper presents a computer aided dimensional synthesis of a mechanism by using unique paths generated from a incidence matrix of graph theory. The mechanism has been represented by the incidence matrix of graph theory. The algorithm to make unique paths(vector loops) from the incidence matrix has been developed, and synthesis equations are generated automatically from the unique paths and precision points. Marquardt's optimal method is used to solve the high-order nonlinear synthesis equations so that the all dimensions of the mechanism are obtained at initial position.
휜이 부착된 강제 공랭 모듈 주위의 유체유동 및 열전달
이인태,박상희 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
An experimental study was performed to investigate adiabatic wall temperature and heat transfer coefficient around on a module with longitudinal fin heat sink cooled by forced air flow. In the first method, inlet air flow(1∼7m/s) and input power(3, 5, 7W) was varied after a heated module were placed on an adiabatic floor(320×550×1mm^3). An adiabatic wall temperature was determinated to use liquid crystal film(LCF). In the second method to determinate heat transfer coefficient, inlet air flow and the heat flux of rubber heater(0.031∼0.062W/cm^2) was varied after an adiabatic module was placed on rubber heater covering up an adiabatic floor. In addition, surface oil-firm visualization were performed to characterize the macroscopic flow-field around a module.
이정식,이재준,박종영 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-
The purpose of this study is to examine Type I extreme distribution theoretically and to apply it to hydraulic engineering. An annual maximum rainfall is simulated by the Type I extreme distribution based on Monte Carlo method and compared with 92 annual maximum rainfall data of the Taegu in Korea. The parameters of Type I extreme distribution are estimated by method of moment. The estimated parameters were checked by parameter validity conditon of the Type I extreme distribution. Two tests which are χ2-test and Kolmogorov-Smirnov test are used in this study to determine the goodness of fit of the distribution. Anderson correlation test, run test, Spearman's rank correlation coefficient test and turning point test are used to test of randomness of annual maximum rainfall data. Consequently, it was found that annual maximum rainfall is fit well to Type I extreme distribution and simulated data by using Monte Carlo method is suitable to raw data.
박창범,남영재,채창현 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
This paper describes the Hybrid Intelligent controller using Modular Recurrent Neural Network(MRNN) controller and Simplified Indirect Inference Method(SIIM) Fuzzy PD controller, which is used to control a three axis PUMA robot. First, the SIIM Fuzzy PD controller is derived from the conventional continuous time linear PD controller. Then the fuzzyfication, control-rule base, and defuzzification using SIIM in the design of the fuzzy controller are discussed in detail. The proposed controller enhances the self-tuning control capability. Second, the modular recurrent neural network(MRNN) controller has additional feedback neurons in the conventional multi-layer neural network. the learning law based on gradient search techniques has been used. The simulation results of a three-axis PUMA robot shows that comparing to the MRNN controller plus fixed PD controller, the proposed method gives the better precision on the tracking of the given circular trajectory and the better approximation for three-axis respectively.
플레이트 거더사교의 둔각부에서 전단력 산정을 위한 윤하중분배계수
강창조,송재호,장일영 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
The wheel load distribution factors specified by Korean Bridge Design Code and AASHTO Specifications don't account for the effect of skew. Therefore use of inappropriate wheel load distribution factors can mislead to design shear in skewed bridges. This study is making understanding of property of skew bridges and concept of distribution factor for a shear in skew bridge obtuse and gives overview of problems of existing formulas, and suggesting a finite element model using results from field tests on two plate girder bridges. The considered parameters are girder spacing, span length, slab width, skew angle. and the regression analysis is performed to develop the distribution formulas which include many parameters which have an effect on distribution factors. To confirm the validity of the proposed formulas, its results are compared with AASHTO, AASHTO LRFD. At the result, this suggesting formula is showing that increasing rate of wheel load distribution factor concerned with parameters is decreasing and this is showing definite difference with existing specifications.