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이 글은 평면파 소음의 감소 성능을 향상시키고 고차모드로 전달되는 소음의 감소도 가능한 공 조덕트용 능동소음제어장치의 개발에 대하여 논하였으며, 실험결과 개발된 능동소음제어장치의 성능 및 안전성이 기 상품화되어 있는 외국의 제품에 비해 손색없이 뛰어남을 발견하였다. 능 동소음제어장치는 앞으로 고도의 청정, 정숙환경이 요구되는 반도체공장, 방송국 등에 폭넓은 적용이 기대되며, 기존의 흡음처리 대책보다 설치, 보수 및 유지가 간편하다. 특히 덕트내 주요 소음원인 블로워의 소음특성이 저주파 부근에 에너지가 집중되어 있음을 고려할 때 능동소음제 어기술의 공조덕트내 소음제어에의 적용은 매우 효과적이며 경제적일 것으로 기대된다.
This study was conducted to provide low carbon farming technique for greenhouse gases(GHGs) emissionreduction in agriculture sector. It reviewed literatures on the characteristic of cultivation technique and itseffects on carbon emission reduction. The effects of GHGs emission reduction were evaluated in agriculturalland with several farming practices. In the rice cultivation technique, the irrigation water management showedgood effect on GHGs emission reduction in paddy field. It also evaluated reduction efficiency of source ofnitrogen supply and soil improvement. The intermittent irrigation showed 25.1% carbon reduction efficiencyas compared to continuously flooded treatment. Slow release fertilizer and ammonium sulphate decreasedcarbon emission by 19.8% and 7.9% compared to urea, respectively. With soil amendments treatment, silicatefertilizer and zeolite reduced carbon emission 14.1% and 21.7% compared to rice straw treatment. In theupland crop cultivation technique, the efficiency of tillage management, green manure, livestock compost andnitrification inhibitor application were estimated. Substitution of 50% of nitrogen with hairy vetch showed65.6% carbon reduction efficiency. It also showed 20.4% emission reduction with nitrification inhibitortreatment. However, GHGs emission were increased with livestock compost application. It provided basicdata for reducing the GHGs emission in agriculture sector by accomplishing low carbon farming techniqueand policy project.
Remodeling is an architectural activity that transforms the existing state of specific building which has been aged and cliched into new state overcoming those aged and cliched state. Remodeling can be a means to increase building’s physical life-cycle and also a countermeasure to cope with the changes in use that are from social demand, use and technical development. The performance evaluation on the remodeling tenement shall be done by understanding the performance and state of the building before and after remodeling and then it shall represent the improvement in performance objectively by comparing the differences before and after remodeling. In this aspect, we performed basic research to conduct performance evaluation on the remodeling tenement by comparing and analyzing the performance evaluation and performance certificate systems of Korea and Japan in order to suggest objective evaluation system on the change of tenement building before and after remodeling. Now a performance evaluation system as opposed to new apartment is prepared at a point in time when demand increase of remodeling is expected, and the presentation of performance evaluation as opposed to a whole, now remodeling process is the deficient fact. The process that the propriety of remodeling be inspected before remodeling enforcement here, and prove as opposed to an investment after remodeling as a client, ordering is necessary by all means. A state of an existing house is grasped through performance evaluation of an existing apartment, design performance evaluation of remodeling apartment, under construction evaluation, completion evaluation by this study. And plan of a procedure to provide satisfaction to a resident because a remodeling design to be good for the situation and a demand of a resident and execution were measured, and confirmation evaluated, result performance was shown.
In this paper, a new approach for continuous digits recognition using the Spatio-Temporal Neural Network (STNN) is reported. The continuous seven digits are gargeted to recognize, and our initial recognition rate was 28%. In this paper, to increase the recognition rate, two methods are proposed. In the first method, to compensated the STNN's own defect as well as to emphasize the Korean digits' phonic characteristics, the starting point ofeach digit is detected using the energy and zero-crossing rate, but the ending point is detectedonly using the energy value. In this case, the seven digits recognition reate increased to 61%. Furthermore, in the second method, considering the fact that a same digit could be pronounced differently in continuously spoken environment, the number of STNNs used to represent each digit is increased from one to five. Consequently, the same digit but pronounced differently could be handled well in the new system. As a result of that, the continuously spoken seven digits recognition rate increased to 89%.
중국 최대의 담수호로 장강을 통해 서해로 유입되는 포양호의 특성, 주변의 농경지 토양환경, 시기별 포양호 수질변화 및 유입되는 각 수계별 수질오염 부하량 등을 검토하였다. 1. 포양호는 주변 지역의 벼 재배와 홍수 조절에 중요한 역할을 하며 최근 간척과 침척토의 침적 등에 의하여 면적이 매년 축소되고 있다. 2. 아열대 기후에 속하여 연평균 강우량이 1,570㎜ 수준으로 비교적 많으나 연 중 분포가 평준하지 않고 월별 차이가 커서 시기별로 호수의 수표면적 및 저수량의 변화가 대단히 크다. 3. 주변 지역의 농경지는 큰 오염원이 없어 비교적 오염되지 않은 토양이며, 오염도가 심한 농경지는 호수 유역의 전체 농경지 면적중 0.22%로 광산 인근 토양이 구리와 황으로 오염되어 있다. 4. 포양호에 직접 유입되는 COD부하량은 시기별로 홍수기가 371.9톤/일로 갈 수기 273.9톤/일에 비해 많았다. 요인별로는 산업체에서 기인되는 양이 가장 많았으며, 유입되는 수계별로는 감강으로부터 유입되는 오염 부하량이 가장 많았다. Water in Poyang lake, which is one of the biggest lake in China, flows into Yellow Sea through the Changjiang River. In this paper, water quality characteristics and loading amount of contaminants of Poyang Lake area were investigated. Poyang lake has a important role to rice cultivation and flood control in the basin of the lake. However, the area of the lake has been reduced gradually by land reclamation and sedimentation. This area belongs to the subtropical zone and the average rainfall is near 1,570㎜, which is relatively higher than other region in China. The surface area and the volume of storage water of the lake is very changeable following to the big different monthly rainfall. Agricultural field near the lake is not contaminated comparatively because there is little source of contamination near the Poyang lake. About 0.22% of the total agricultural field near the lake were heavily contaminated by copper and sulfur originated from metal mines. Inflow loading amount of COD(chemical oxygen demand). Compared to other sources of contamination such as municipality, livestock, and nature, industrial source of COD to Poyang lake were the greatest. Ganjiang stream was the highest for the loading amount of COD to Poyang lake among 5 streams.