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This paper presents a new approach to $quot;direct$quot; blind equalization of Single Input Multiple Output (SIMO) FIR channels by exploiting second-order statistics only. First, it is stressed out here that there exist a causal and stable inverse (equalizer-bank) under mild conditions on (nonminimum phase) FIR channels when several measurements are performed at the receiver, either by means of oversampling the received signal or by using multiple sensors. Next, from the existence of the inverse of SIMO channels, a new blind equalization criterion based on second-order statistics, is presented. As an implementation, an FIR filter-bank for the equalizers is constructed and an iterative algorithm is proposed. Extensive computer simulation results confirmed the validity and efficiency of the proposed approach.
This study provides an effective approach to the construction management problem with the limited number or amount of available resources using the analytic hierarchy process. Construction management is a series of decision making processes for planning and controling of cost, time and quality as main objectives in construction works. When several activities need the limited same resource at the same time, it is very hard to decide the priority of the activities in the real situations. For that the scientific decision making method and procedure for resource allocation are required. This study solves the resource allocation problem by dealing with the decision making problem which the activities are distributed to multiple projects under multiple criteria. The result shows that this study can be effectively utilized to make decisions for the allocation precedence of the limited same resources under multiple criteria including corporate strategy, tactics, profit and resource usage.
This study deals with the multi-legged roundabout. The purpose of this study is to comparatively analyze the effectiveness of multi-legged roundabout. This study gives the particular attentions to introducing the roundabout to Cheongju. The main results are the followings. First, the multi-legged roundabout with overpass is analyzed to be effective than the existing multi-legged intersection. Average delay time per vehicle is evaluated to be reduced to more than 64.388 or 59.642 sec. Second, the delay of multi-legged roundabout is analyzed to be similar to that of multi-legged intersection. In summary, the introduction of multi-legged roundabout to Cheongju is evaluated to be very effective.
This study is performed to suggest a way to get the reasonable rating factor used in evaluating the load carrying capacity of the bridge. Although the load carrying capacity of the bridges was clearly low compared to the design standard, it was examined that many of the bridges have goodexternal condition rank relatively. Also, it can be assured that load carrying capacity shows a considerable difference according to various conditions even though the bridges have similar serviced life and a structural type. Therefore, this study showed various problems of the current load carrying capacity evaluation of bridges by considering the boundary condition. Based on the existing data of 50 steel bridges, the response ratio was analyzed considering structural type, deflection, strain, serviced life, impact factor, response adjustment factor and external condition rank. The result of this study will be expected to provide the basic information for the reasonable rating factor evaluation of bridge.
This study deals with the 3-legged roundabout. The objective of this study is to analyze the effectiveness of 3-legged roundabout using aaSIDRA. In pursuing the above, this study gives particular attention to comparative analysis among the roundabout, signalized and non-signalized intersections. The main results are the followings. First, in the case of single-lane approach, the effectiveness of signalized intersections with total entering volume more than 1,500pcph and non-signalized intersections with total entering volume more than 900pcph are analyzed to be rapidly decreasing. Thus, the effectiveness of roundabout is evaluated to be better than those of signalized and non-signalized intersections. Second, in the case of double-lane approach, the effectiveness of roundabout with total entering volume less than 3,000pcph are analyzed to be good. However, in the case of more than 3,000pcph, the signalized intersections are evaluated to be better than the roundabouts.
In this study, fire analysis of the high-rise apartment building was performed by CFAST and FDS. The fire scenario which is originated from sofa in a living room was conducted for theconditions of closed window, closed window with sprinkler, opened window with sprinkler. As results, the fire analysis by CFAST shows good agrement to the FDS to calcuate the CO, CO2, O2 concentrations. But, the CFAST predicts only the mean temperature of smoke layer which is somewhat different to the peak value. And the stack effect and smoke diffusion through stairwell of high-rise apartment was analyzed, and it was confirmed that the steady state value of pressure can be obtained by simple stack effect equation.