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This paper develops a technique for efficiently computing the intersection points between rays and an object in a simulated radiograph. This technique allows interactive calculation of simulated radiographs for very complex parts. It needs a geometric model of a part which is approximated by a bounding surface made up of flat triangular polygons. Since rays have a point source, a perspective transformation is applied to convert the point source problem to one that has parallel rays. This permits to use a scan-line algorithm which utilizes the coherence of the grid of rays for the intersection calculations. The efficiency of the technique is shown by comparing compute time of the intersection calculations to a commercial software that computes each ray intersection independently.
The stability of diffusion flame formed behind a bulff-body with fuel injection was investigated experimentally in various injection angle and injection ratio of two-dimensionalized cylinders. The bluff-body was located in the range of air stream velocity 10-60m/s. Especially, flame stability problem was risen at the high speed flow because such a high flow condition flame was nonsteady and nonstable. Therefore, we measured the flame stability limits, distributions of temperrature, and take photographs of flame. The results from this study clearly show that the recirculation zone serves as a steady ignition source of combutible stream and governs the stabilization mechanism, the direction of injection is important factor for determinig the flame stability.
The Integer DCT matrix that is satisfied with two conditions of the orthogonality and the magnitude of DCT and composed of values minimizing the mean square error among integer values will lead to reduce computation time. Sequential images can be reconstructed without great degradation using one codebook in vector quantization, because statistical features of sequential images are similar to. In this paper, we propose integer DCT based - classified vector quantization(CVQ) and the coding method of the sequential images. If the moving block were contained in the search area, then the motion vector and information would be transferred. Otherwise, we would employ 2-D integer DCT-based CVQ to the block, compare to the DC and AC coefficients in the class and select the nearest data of the class, finally transfer only index of the vector in the zonal band. A sequence of Susan is reconstructed with 36~38 dB at 0.03~0.04 bpp through the computer simulation.
As new applications for database management systems(DBMS) progress such areas as office automation and library management, we require an extended system to handle unformated, free text. In order to support these new applications, many text retrieval methods have been studied for English text and the signature file method is considered as an efficient access method. Until now, However, there is little research on signature file methods for Hangul(Korean) text. In this paper, we propose a signsture file method for Hangul text in order to use it as an efficient low-level storage structure for Korean information retrieval systems.
In this study, the blast vibration equations were obtained from all data by square and cube root scaling through test blastings at site UCN and CS. A variable distance was determined on the nomogram (allowable charge weight per delay according to distance) by square and cube root scaling. The profitable employment of sqquare and cube root scaling will give rationality of rock blasting design, the rock blasting design employed true vector sum was more rationally than that employed maximum vector sum. The absolute values of the damping index and ceofficient of correlaction by cube root scaling were larger than that of square root scaling. The blast vibration equations of true vector sum by square and cube root scaling were V_ture = 2199.7(SD)^-1.799, V_true = 6371.4(SD)^-1.945, at site UCN and V_true= 2106.2(SD)^-1.471, V_true = 1504.8(SD)^-1.472 at site CS.
본 연구에서 개발된 액적크기 측정용 자동 영상처리 시스템은 분무노즐로부터 얻어지는 액적의 크기를 저가의 구성장비로 상세하게 측정된 자료로서 제공할 수 있었다. 본 시스템의 정확도는 액적의 평균직경에 대하여 3%이내의 오차를 가지고 있어 만족할 만한 신뢰도로서 결과를 얻을 수 있었다. 그리고 한장의 영상처리에 소비되는 전체시간은 약 25초 이었다. 그러나 이 처리시간은 고속전산기의 발달로 보다 단축될 것으로 기대된다.
Developed in this paper is and aggregate production planning model for the concrete products industry. An L.P. model is formulated whose objective is to minimize the total cost of production during the planning horizon. This model considers basically both the constraints of the mixed production and the characteristics of the cost function. A case example is included for the model validation check. Results of the study indicate that this Kind of production planning would be well used for a guide line of the real production.