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Autoclaved hydrate of CaO-SiO₂-H₂O system was investigated according to CaO/SiO₂ mole ratio and the condition of hydrothermal treatment. Residual product for extraction of alumina from hydrochloric acid treated domestic kaolin and Ca(OH)₂ were used as the source of SiO₂ and CaO, respectively. The main crystalline phases were C-S-H(I), tobermorite, xonotlite and transformed in order of C-S-H(I) → tobermorite → xonotlite as hydrothermal temperature, time, CaO/SiO₂ mole ratio increase. The porosity and absorption were increased with increasing CaO/SiO₂mole ratio and hydrothermal treatment time. The bending strength was dependent on the balanced bond between the residual and hydrothermal products, and tended to be maximum at CaO/SiO₂ of 0.6, and hydrothermal temperature of 140℃.
The cutting amount of each tooth in gear hobbing has much influence on the vibration of the hob axis and the wear of tool. In this study, with the simulation of gear hobbing mechanism, cutting parameters such as cutting thickness, cutting are and area moment were calculated. The cutting torque was also obtained by the experiments. The cutting amount of each tooth in the hob can be compared quantitatively by the simulation on the calculated cutting zone, cutting thickness and cutting are. And the cutting torque obtained by the experiments has the same tendency with the area moment calculated by the simulations. The results of this study can be applied to the research on the tool wear, the hob having modified tooth profile and the variation of cutting torque.
The demand for economically competitive precast building systems has been increasing in Korea at the same time that concerns have grown regarding their seismic resistance capacities. The seismic resistant capacities of one form of precast construction, "Dry Joint System" are described in this study. An investigation consisting of shaking table tests with earthquake motion and subsequent global seismic response are included. A set of conclusions and suggestions for improved performance of dry joint system construction are given along with a discussion of problems in seismic resistant design and behavior of the system.
In this paper, the premise of rule type implication method is composed of fuzzy proposition which linguistic control is possible, and the consequent applies implication method given by linear function. With partitioning input space for vagueness space, and identifying linear input-output relation from each local space, multiple plant rule proves global non-linear input-output relation. If applying co-relation as criterion, searching space and computing progress is reduced for not producing the criterion of all the premise structures but producing, and comparing the criterion of partitioned space, and after deciding optimal premise, deciding the consequent which follows the premise.
High-Molecular weight and high linearity Poly(vinyl alcohol) was prepared by photo-polymerization using ultra violet light and photo initiator (Benzoin Ethyl Ether). The effect of the polymerization temperature and initiator concentration on the molecular weight and linearity were determined. About 1.0×10() molecular weight of PVAc and 0.4×10() molecular weight of PVA by hydrolysis reaction was obtained using optimum condition, 20℃ reaction temperature and 0.01wt% initiator concentration.
The purpose of this research is to present a comparative study of steel column types for high-rise buildings. The results of this study show that hollow steel column shows more advantages than H-type section not only in structural behavior but also in economical point of view.
In recent years, the design criteria for vibration control are more strict. In this study, the dynamic characteristics of the slab is analyzed and the vibration is controlled for the special peculiarity of structures. First, the procedure of dynamic analysis is developed by the finite element method and then examined by using the slab model tests. Second, in order to improve the dynamic characteristics, the effects of the number of supports, material properties, position of exciting force, added mass and dynamic balance on the dynamic behavior of concrete slabs are analyzed. It is concluded that the vibration can be controlled by the change in the natural frequency of system and the use of the high-strength concrete or polymer impregnated concrete(PIC), and the dynamic characteristics can considerably affected by the arrangement of equipments, and added mass. etc.
This study presents system cost analysis as one of the economic evaluation methods used by POWRSYM-PLUS, a computer model, to review the optimal share of a peaking plant in generation systems. The share of a peaking power plant in a system should be compared against the total generating system cost, simulated by chronological hourly load variations for the accurate operating position of each power plant. This study compared actual generation costs in the construction scenarios of peaking plants through computer simulation with chronological hourly load data. Results indicated that theoretical optima share of peaking power plants (hydro, pumped-storage, G/T, diesel plant) in 2005 will be 16.6~8.4%(9,361~0,361 MW) of total generating capacities (56,360 MW).
The purpose of this study attempts to suggest solutions for proper number of hosital beds in nation wide. Surveyed 48 medical experts to get their opinions for their desirable capacity and quality of medical facilities in nation wide. The result of surveys are as follows. ① At least 500 beds out of 100,000 people are desirable in nation wide. ② It means 217,600 new beds need in the year 2000. ③ Occupancy rate and travel distance are major concern for adequacy and equity of hospital facilities.
The method to determine crack growth exponent and Weibull modulus was studied in alumina ceramics. The values of the crack growth exponent n for static fatigue and cyclic fatigue were determined by measuring the fatigue lifetime as 39.73±10.62 and 21.60±2.46, respectively. The crack growth exponent n and the Weibull modulus m can be directly determined by reading the slopes of the SPT(Strength-Probability-Time) and TPS(Time-Praobability-Stength) diagrams, which are nm/(n-2) and m/(n-2), respectively. The slopes of SPT and TPS diagrams for the static fatigue test are 24.09±0.68 and 0.61±0.02, respectively, and the resulting n and m are 39.49 and 22.87, respectively. For the cyclic fatigue test, the slopes of SPT and TPS diagrams are 16.97±0.50 and 0.79±0.02, respectively, and the resulting n and m are 21.48 and 15.39, respectively. The values of the crack growth exponent and Weibull modulus obtained in this method show small deviation and large reliability than the values obtained by other methods.