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Multimedia databases require an indexing technique that is able to provide high performance with high dimensional data. Unlike other tree based indexing techniques, LSH inherits the characteristics of hashing, and thus is suitable for high dimensional data. However, it is difficult to apply LSH to real life databases because the performance of LSH is quite sensitive to its parameters and also the properties of datasets. In this research, we first analyze the characteristics of LSH and the changes of its accuracy and performance according to different parameter settings through extensive experiments in a video database environment. In addition, based on the results and analyses, we propose four new hash functions that reflect the properties of high dimensional datasets and show their effectiveness in terms of accuracy and performance via a series of experiments. 멀티미디어 데이터베이스는 고차원의 데이터에서 좋은 성능을 제공하는 인덱싱 방안이 요구된다. LSH는 트리 기반 인덱싱과 달리 해쉬의 특성을 이용하여 고차원 데이터에도 적용할 수 있는 인덱싱 방안이나, 데이터의 특성과 파라메터 설정에 따라 성능이 크게 달라지기 때문에 실제 데이터베이스에 쉽게 적용하기 어렵다. 본 논문에서는 고차원의 비디오 데이터베이스에서의 최근접 이웃 검색을 위한 LSH 인덱싱 방안에 대해 폭넓은 실험을 수행하여 LSH의 특징과 파라메터 설정에 다른 정확도 및 검색 속도 변화를 파악하였다. 또한, 실험을 통해 파악한 LSH와 고차원 데이터의 특징을 반영하는 새로운 네 가지 해쉬 함수 생성 방안을 제시하고, 실험을 통해 정확도 및 검색 속도가 향상됨을 보였다.
The Apartment house in Korea has first appeared in 1930s, during the Japanese governed period. In 1960s, many apartment houses were built in Large cities such as Seoul and Busan and in 1970s, high-rise apartments were very common and after 1980 and 1990s, super high-rise, very tall housing(over 60 stories) were appeared. In this thesis, selecting rewarded housing works after 2000s, analyzing their architectural characteristics such as layout types, traffic plans and exterior space forms, forms of single buildings, several representative types of planning methods are found and listed.
TiO$_2$ nanoparticles were prepared by photochemical synthesis in the dry toluene. The shape and size of the amorphous TiO$_2$ nanoparticles were investigated by transmission electron microscope. The particle size was varied by the contents of the titanium (IV) isopropoxide in dry toluene. Especially networked TiO$_2$ particles were formed from 40% titanium (IV) isopropoxide solution. The optical absorption spectra, photoluminescence, and PL excitation spectra of TiO$_2$ in dry toluene were obtained. The were shifted to the short wavelength as the contents of TiO$_2$ were increased. PL excitation had the peak at the wavelength regions is which the absorption increased steeply.
TiO2 nanoparticles were prepared by photochemical synthesis in the dry toluene. The shape and size of the amorphous TiO2 nanoparticles were investigated by transmission electron microscope. The particle size was varied by the contents of the titanium (IV) isopropoxide in dry toluene. Especially networked TiO2 particles were formed from 40 % titanium (IV) isopropoxide solution. The optical absorption spectra, photoluminescence, and PL excitation spectra of TiO2 in dry toluene were obtained. The spectra were shifted to the short wavelength as the contents of TiO2 were increased. PL excitation had the peak at the wavelength regions is which the absorption increased steeply.
남숙현 ( Sook-hyun Nam ), 구재욱 ( Jae-wuk Koo ), 김은주 ( Eun-ju Kim ), 박재로 ( Jae-ro Park ), 전숙례 ( Sook Lye Jeon ), 박주현 ( Joo Hyun Park ), 문병진 ( Byeong-cheon Mun ), 황태문 ( Tae-mun Hwang ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.6
This study was carried out to investigate the coagulation performance of some natural and synthetic material to remove chlorophyll-a and suspended particles in water. This natural coagulant is made of vegetable substances and plant-mineral composites. The removal of chlorophyll-a and suspended particles as a function of time, dose and initial concentration are tested. The natural coagulant dosage is determined with jar tester method. Samples in this study are mixed with water with high contamination of several algae species. The chlorophyll-a removal rate was 98 % and BGA removal rate was 100 % in water with low concentration of chlorophyll-a(sample A). The chlorophyll-a removal rate was 86 % and BGA removal rate was 76 % in water with high concentration of chlorophyll-a(sample C). It could also improve particulate and organic matter removal efficiency, indicating that it was highly effective as the coagulant agent. Also, an optimal dosage of coagulant on sample C becomes 2 times to 3 times larger than sample A. The fluorescence spectroscopy method using EEM showed that the peak of phycocyanin and Chlorophyll-a was simultaneously removed after the coagulant treatment. This method will be useful tool as an monitoring device. As a result of experiment using Daphnia magna as an indicator of toxicity, the optimal concentration of natural coagulant used in this experiments did not have a significant effect on toxicity.