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企業 附設 硏究所 活動實態에 관한 硏究 : 釜山·慶南地域을 中心으로
河正鎭,黃圭完,申大赫,兪炳哲 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2
The research institute of an enterprise attaches have been enlarged in korea. This study grasps the status and the research activity in the research institute of an enterprise attached in the Pusan and Kyungnam. So, we find the important role in the research institute of a enterprise attached.
이철재,김시범 동아대학교 공과대학 부설 한국자원개발연구소 1991 硏究報告 Vol.15 No.1
The problem of the contact-melting of PCM within a horizontal cylindrical capsule has been analyzed under the approximate assumptions. The present analysis focused special attention on the influence of the melt flow on the heat transfer characteristics. This study yields the following conclusions: (1) The relationship between melt time and the solid bulk shift is obtained by t^(*) = [Ar Pr ρ^(*3)f³(Ste)]^(-1/4) (0.188s^(*3)+0.322s^(*2)+2.01s^(*)) (2) The temperature profile in the melt layer becomes more curved as the Stefan number increases. Hence, it takes more time for the PCM to melt than in the conduction dominant case. (3) The melt layer thickness is mininum at the bottom (θ〓0), and increases toward the outlet of the contact melting region in early times, but at later times, it becomes larger and nearly flat along the periphery.
이동욱,김명기,이취중,김근중 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.1
A spread spectrum(ss) communication system has a lot of advantage, such as realization of asynchronous code division multiplexing(CDM), robutness to narrow-band interference, imulse noise, privacy function, and so on. We have considered utilization of these advantage to develop a local area network(LAN) using such a transmission channel as a power-line. In this paper, we investigate its performance by constructing a LAN using SS technique.
장윤영,홍창희 동아대학교 공과대학 부설 한국자원개발연구소 1991 硏究報告 Vol.15 No.1
The MOS capacitor is one of the most useful devices for basic characterization of semiconductor material and interface properties. Oxide thickness, substrate impurity profiles, interface state distribution, and impurity energy levels are just a few of characteristics which capacitance-voltage(C-V) measurements help quantify. while closed-form analytic expression for the C-V characteristics of MOS devices with uniform substrate doping concentration are well known, similar expression for nonuniform impurity profiles cannot be obtained. This paper presents a computationaly efficient numerical method for the evalution of equilibrium C-V characteristics of one-dimensional MOS capacitor whose substrate has the arbitrary doping profile. A computer program MOSCAP is coded in Microsoft FORTRAN Ⅴ, accurately calculates MOS C-V profiles from 50k to 350k.
강양원,윤기정,홍창희 동아대학교 공과대학 부설 한국자원개발연구소 1991 硏究報告 Vol.15 No.1
Deep level transient spectroscopy(DLTS) is a techique to chacterize traps in semicondoctor. This technieque has shown good sensitivity and accuracy for obtaining the four main physical parameters of deep traps:activation energy, trap concentration, majority or minority trap and capture cross section. DLTS signal is the difference between the transient capacitance at two sampling times(rate window) selected. During the thermal scan, there is a maximum or minimum peak corresponding to trap level. Trap level is found to 0.49 or 0.32eV below the conduotion band at 256K and 175K.
難燃劑 添加 Poly Alkyl Methacrylate의 劣化에 관한 硏究
薛秀德,金東建 동아대학교 공과대학 부설 한국자원개발연구소 1991 硏究報告 Vol.15 No.1
The thermal degradation of poly alkyl methacrylate and flame-retardant tetrabromobisphenol-A(TBBA) mixtures were carried out using the thermogravimetric method in the stream of nitrogen gas with 50㎖/min at the various heating rate from 4 to 20℃/min. Friedman and Ozawa mathematical methods were used to obtain the value of activation energy. The thermal degradation of poly alkyl methacrylate and TBBA mixtures by the analysis of infrared spectrophotometer were decomposed by main chain scission in the stream of nitrogen.
Chemical Vapour Sensor using a SAW Resonator
Chang, Sang-Mok 동아대학교 공과대학 부설 한국자원개발연구소 1991 硏究報告 Vol.15 No.1
A surface acoustic wave(SAW) device has been used as a chemical vapour sensor by coating phosphatidylethanolamine(PE) on to the device surface as an appropriate adsorptive coating. The characteristics of a PE-coated SAW resonator operating at 310 ㎒, and capable of detecting chemical vapours, such as amyl acetate, citral, β-ionone, menthone and other organic gases are described. The lowest concentration (by volume) of chemical vapours required to change the resonant frequency was different for each compound and the values were 0.1 ppm for β-ionone, 0.5 ppm for citral, 2 ppm for menthone, 10 ppm for amyl acetate and 100 ppm for alcohols, respectively. These data are in agreement with the results previously reported for olfactory cells and AT-cut crystal resonator devices. This study demonstrated that the SAW resonator device, coated with lipid, can be applied as a chemical vapor sensor.
박춘근,전철호,장영석 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
The purpose of the research is to study the prediction of heat transfer on flat heat pipe applid to solar energy collector by the numerical study. Numerical analysis was performed by finite element method for the prediction of heat transfer on flat transfer on flat heat pipe. A comparison between the experimental and the numerical results show qualitatively agreement and it was able to predict the performence of flat heat pipe collector. The Biot number, (h_(ev)l)/Ks in order to know the effect of heat transfer on flat heat pipe was show to decrease by increas of heat transfer coefficient in vapor region, and with higher conductivity of container, Ks.
배태열,정한식,박재림,김시범,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
Natural convection within a wedge-shaped enclosure has been studied by using finite different method. Radial surfaces of the wedge are isothermally hot and cold walls while circumferential surfaces are insulated walls. The Rayleigh numbers change from 10³ to 10^(5). The results show isotherms, streamlines and velocity profiles as well as heat transfer correlations. There is a wedge angle, which minimizes the mean Nusselt number.
이만웅,배홍석,이보근,송서일 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
In the rectifying single sampling inspection, 9-sampling inspection methods are briefly described, and then the optimal inspection plan to minimize the expected total cost is derived. The results of this experiment through numerical example are: (1) The optimal inspection plan of sampling to minimize the cost with several variables is derived. The result is TC(134, 4)=2321. (2) The optimal inspection plan is obtained when the LTPD is increased, and the sample size, acceptance number and total cost are decreased. (3) The optimal inspection plan is obtained when the lot size is increased, and sample size and acceptance number are also increased. (4) When e₁ is fixed and e₂ is increased, p_(e) is decreased with very small erefore, the type -Ⅰ error must influences on sample size more than the type-Ⅱ error does.