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급속 소결에 의한 인공관절용 나노구조 2/3 Cr-ZrO<sub>2</sub> 복합재료 제조 및 특성
강현수,강보람,손인진,Kang, Hyun-Su,Kang, Bo-Ram,Shon, In-Jin 한국재료학회 2014 한국재료학회지 Vol.24 No.9
Despite having many attractive properties, $ZrO_2$ ceramic has a low fracture toughness which limits its wide application. One of the most obvious tactics to improve its mechanical properties has been to add a reinforcing agent to formulate a nanostructured composite material. Nanopowders of $ZrO_2$ and Cr were synthesized from $CrO_3$ and Zr powder by high energy ball milling for 10 h. Dense nanocrystalline $2/3Cr-ZrO_2$ composite was consolidated by a high-frequency induction heated sintering method within 5 min at $600^{\circ}C$ from mechanically synthesized powder. The method was found to enable not only rapid densification but also the inhibition of grain growth, preserving the nano-scale microstructure. Highly dense $2/3Cr-ZrO_2$ composite with relative density of up to 99.5% was produced under simultaneous application of a 1 GPa pressure and the induced current. The hardness and fracture toughness of the composite were 534 kg/mm2 and $7MPa{\cdot}m1/2$, respectively. The composite was determined to have good biocompatibility.
강현수,성찬용,Kang, Hyun-Soo,Sung, Chan-Yong 한국농공학회 2009 한국농공학회논문집 Vol.51 No.1
This study was performed to evaluate the physical and mechanical properties of concrete using waste activated carbon. Materials used were ordinary portlant cement, crushed coarse aggregate, natural fine aggregate, waste activated carbon, and superplasticizer. The substitution ratios of waste activated carbon were 0,1,2,3,4,5,6,7,8,9 and 10%. The unit weight was decreased and water absorption ratio was increased with increasing the waste activated carbon content, respectively. When the substitution ratio of waste activated carbon was 3%, compressive strength, flexural strength and dynamic modulus of elastisity were more higher than that of the ordinary portland cement (OPC), and it was decreased with increasing the waste activated carbon content, respectively. The most effective contents of waste activated carbon was 2% in performance and 4% in practical use Accordingly, waste activated carbon can be used for concrete material.
고주파 유도 가열에 의한 나노구조 Mg<sub>4</sub>Al<sub>2</sub>Ti<sub>9</sub>O<sub>25</sub> 합성 및 소결과 기계적 성질
강현수,도정만,윤진국,손인진,Kang, Hyun-Su,Doh, Jung-Mann,Yoon, Jin-Kook,Shon, In-Jin 한국재료학회 2014 한국재료학회지 Vol.24 No.2
Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties, including high strength, high hardness, excellent ductility and toughness. In this study, nanopowders of $Al_2O_3$, MgO and $TiO_2$ were prepared as starting materials by high energy ball milling for the simultaneous synthesis and sintering of the nanostructured compound $Mg_4Al_2Ti_9O_{25}$ by high-frequency induction heating process. The highly dense nanostructured $Mg_4Al_2Ti_9O_{25}$ compound was produced within one minute by the simultaneous application of 80MPa pressure and induced current. The sintering behavior, grain size and mechanical properties of the $Mg_4Al_2Ti_9O_{25}$ compound were evaluated.
움직임 추정오차의 예측을 이용한 고속 움직임 추정 방법
강현수,Kang, Hyun-Soo 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.9C
This paper presents an enhanced MSEA(multi-level successive elimination algorithm) which is a fast algorithm of the full-search motion estimation. We predict the SAD at the final level using the values of norms at the preceding levels in MSEA and then decide on whether the processing at the following levels should be proceeded or not. We skip the computation at the following levels where the processing is not meaningful anymore. Consequently, we take computational gain. For the purpose of predicting the values of SAD at each level, we first show the theoretical analysis of the value of norm at each level, which is verified by experiments. Based on the analysis a new motion estimation method is proposed and its performance is evaluated. 본 논문은 고속 전역탐색법 중의 하나인 MSEA(multi level successive elimination algorithm)를 개선한 방식으로서, MSEA의 단계에 따른 norm의 계산 결과를 이용하여 최종 단계의 SAD를 예측함으로써 더 이상의 단계를 수행할 필요가 없다고 판단되는 단계의 계산을 생략함으로써 계산 량을 감소시키는 방법을 제안한다. 각 단계별 SAD의 예측을 위해 norm에 대한 이론적 분석이 이루어지며 실험을 통해 분석내용을 검증하고, 이를 바탕으로 새로운 알고리즘을 제안하고 실험을 통해 제안된 알고리즘의 성능을 평가한다.
강현수,김미진,신용호,전용철,Hyun Su Kang,Mi-Jin Kim,Yong Ho Shin,Yong Chull Jeun 한국식물병리학회 2023 식물병연구 Vol.29 No.4
당근 세균잎마름병을 일으키는 Xanthomonas hortorum pv. carotae는 당근 생산량에 큰 피해를 주는 병 중 하나로 국내에서 아직 방제에 대한 연구가 미흡한 실정이다. 본 연구에서는 당근 세균잎마름병균에 효과적인 농약을 선발하기 위하여 3종의 항생제 streptomycin, oxolinic acid, kasugamycin, 2종의 구리제 copper hydroxide, copper sulfate basic 그리고 길항근권세균 Burkholderia gladioli MRL408-3, Pseudomonas fluorescens TRH415-2, Bacillus cereus KRY505-3을 선정하여 인공배지를 이용하여 이들의 직접적인 항균효과를 조사하였다. 이 중 항생제 streptomycin, oxolinic acid와 길항미생물 MRL408-3을 처리한 배지에서 억제환이 형성되었다. 당근 잎에 농약과 항균효과를 보였던 길항미생물 MRL408-3을 전처리한 후 당근 세균잎마름병균을 접종하였더니 streptomycin과 oxolinic acid을 전처리한 당근 잎에 높은 방제효과를 보였다. 이들 당근 잎 표면의 장방출주사현미경 이미지에서 streptomycin과 oxolinic acid를 전처리한 잎에서는 세균 수가 무처리한 잎과 비교하여 급격히 감소하였다. 이들 결과를 통해 streptomycin과 oxolinic acid와 같은 항생제가 다른 약제에 비해 방제 효과가 뛰어나다는 것을 알 수 있었다. 본 연구는 당근 세균잎마름병에 대한 이상적인 방제 시스템을 구축하는 데 도움이 되는 자료로서 가치가 있을 것으로 생각된다. Bacterial blight of carrot caused by Xanthomonas hortorum pv. carotae (Xhc) is one of the serious diseases of carrot, of which control measures has not been still established in the domestic farm. In this study, in order to select effective sterilizer for bacterial blight of carrots, three antibiotics such as streptomycin, oxolinic acid, kasugamycin, two copper compounds like copper hydroxide and copper sulfate basic and three rhizobacteria Burkholderia gladioli MRL408-3, Pseudomonas fluorescens TRH415-2 and Bacillus cereus KRY505-3 were selected to investigate their direct antibacterial effects using artificial media, aiming to identify effective pesticides against Xhc. Among them, treated medium with antibiotics such as streptomycin, oxolinic acid, and the antagonistic rhizobacteria MRL408-3 were formed inhibition zone. The agrochemicals and the rhizobacteria MRL408-3, which showed antibacterial effects on carrot leaves, pre-treated on the carrot leaves and then inoculated with Xhc. High control effects were shown on the carrot leaves pre-treated with both streptomycin and oxolinic acid. Scanning electron microscopy images of the carrot leaf surfaces showed that the population of bacteria decreased significantly on leaves pre-treated with streptomycin and oxolinic acid. From these results, it can be inferred that antibiotics like streptomycin and oxolinic acid exhibit superior control effects compared to other agents. This study provides valuable insights towards establishing an effective control system for bacterial blight of carrot.
대량의 정보 검색 결과를 위한 "결과 렌즈"의 설계 및 구현
강현수(Hyun-Su Kang),강현규(Hyun-Kyu Kang),김영섬(Young-Sum Kim),이용석(Yong-Seok Lee) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1B
정보 검색이란 사용자의 요구에 가장 적합한 정보를 검색하는 것이다. 그러나 정보의 바다라고 불리는 인터넷에서 사용자의 질의어에 의하여 검색되는 결과는 (검색 시스템에 따라 다양하지만) 방대하다. 따라서 본 논문은 방대한 결과에 대하여 사용자의 요구에 만족하는 문서를 보다 정확하고 빨리 검색할 수 있도록 하기 위하여 다양한 뷰를 제공하는 결과 렌즈(Results Lens:RL)를 제안한다. 본 논문에서 제안한 결과 렌즈는 검색된 결과들에 대하여 여러가지 뷰(검색어 조정, 분류, 상호정보, 이합 집산)를 제공하여 검색 결과들을 정련(refine) 할 수 있으며, 플러그 인(Plug-in)으로 개발하여 개발의 용이함은 물론 배포 및 확장이 손쉽다.