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소셜 네트워크에서 원거리 노드를 고려한 동적 사용자 신뢰도 평가 스킴
김영웅(Youngwoong Kim),최윤성(Younsung Choi),권근(Keun Kwon),전웅렬(Woongryul Jeon),원동호(Dongho Won) 한국정보보호학회 2014 정보보호학회논문지 Vol.24 No.2
소셜 네트워크 서비스는 인터넷상에서 다른 사람들과 친구 또는 사회적 관계를 맺을 수 있는 양방향 서비스로써 개방성을 바탕으로 인적 교류 네트워크의 중심이 되었다. 그러나 최근에는 개방성을 악용하여 신뢰할 수 없는 유언비어가 확산되고 개인 정보를 침해하는 다양한 공격으로 인해 여러 사용자들이 피해를 보는 사례가 발생하였다. 따라서 소셜네트워크상에서의 정보는 신뢰할 수 있는 사람에게 전달하거나 혹은 제공 받을 수 있어야 한다. 최근의 신뢰도 연구에서는 사용자와 밀접한 한 홉 사이를 기반으로 한 신뢰도 평가방법들이 주로 제시되었다. 그러나 소셜 네트워크의 교류가 기존의 시공간성이 갖는 제약을 넘어서고 사용자도 큰 폭으로 늘어나면서 한 홉 사이뿐 아니라 여러 홉 사이에서의 교류 역시 최근에 많이 증가하고 있다. 이러한 흐름에 맞춰 본 논문에서는 전이성 및 결합성을 이용하여 원거리에서도 신뢰도 평가가 가능한 효과적인 사용자 신뢰도 평가 스킴을 제안한다. The social network service is the bidirectional media that many users can build relations not only friends but also other people. However, a process to approach in the social network is so simple that untrustable information, which malignant users make, is spreaded rapidly in many the social network uses. This causes many users to suffer material or psychological damages. Because of openness in the social network, there will be higher risk of the privacy invasion. Therefore, sensitive information should be transferred or provided only to reliable users. In general, because many users exchange among one hops, many researches have focused on one hop’s trust evaluation. However, exchanges between users happen not only one joint bridege but also far nodes more than two nodes on account of dense network and openness. In this paper we propose the efficient scheme combining transitivity and composability for remote users.
온존과 광촉매를 이용한 Geosmin 제거 및 부산물 생성에 관한 연구
김영웅(Young Ung Kim),손희종(Hee Jong Son),유명호(Myung Ho Yu),김성윤(Seong Yun Kim),김철(Chul Kim) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.4
This study was carried out comparing with ozone oxidation and photocatalytic degradation for removal of geosmin. In the change of pH, Ozonation, UV-Germicidal lamp and Halogen lamp irradiation and Halogen lamp/TiO₂ Powder was very slowly changing, but UV-Germicidal lamp/TiO₂ Powder was rapidly changed from 7.0 to 7.7 until 300min of irradiation time, and varied a little after. Geosmin degradation ratio was as following, UV-Germicidal lamp/TiO₂ Powder_((200㎎/L)) ≥ O₃$gt; UV-Germicidal lamp/TiO₂ Pw_((100㎎/L)) $gt; UV-Germicidal lamp $gt; Halogen lamp. The result of investigation of generated by-products were 3-Heptanone, two sort of aldehydcs and three sort of alcohols by ozonation. But It was not generated by photocatalytic degradation.
Microcystis sp. 의 오존접촉특성 및 부산물 생성에 관한 연구
김영웅(Young Ung Kim),손희종(Hee Jong Son),유명호(Myung Ho Yu),이춘식(Chun Sik Lee),김성윤(Seong Yun Kim) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.4
This study investigated the removal characteristics, Microcystin decomposition and generation of by-products when aqueous Microcystis sp. is oxidized by ozone. The concentration of Microcystin (MC) in aqueous solution has been found by HPLC analysis to decrease continuously by ozonation after the initial, abrupt increase. The kinetic constant of the decomposition of MC-RR and -LR were 0.0596 and 0.0243, respectively. This means that removal efficiency of MC-RR by its oxidative decomposition is preferable compared with that of MC-LR. On the other hand, it has been found that the decomposition product, TOC, exhibits the continuous decrease in the concentration by further ozonation, while DOC and UV-254 increase temporarily until 10 minutes before the decrease. Furthermore, the GC/MSD analysis has revealed that the ozonation of Microcystis sp. for 100minutes affords five kinds of aldehydes, six kinds of alcohols, and trans-1, 2-dimethyl-cyclopropane.
Inverse Class-F 기법을 이용한 900 ㎒ 전류 모드 Class-D RF 전력 증폭기 설계
김영웅(Youngwoong Kim),임종균(Jonggyun Lim),강원실(Wonshil Kang),구현철(Hyunchul Ku) 한국전자파학회 2011 한국전자파학회논문지 Vol.22 No.12
본 논문에서는 900 ㎒ 대역에서 동작하는 전류 모드 Class-D(Current-Mode Class-D: CMCD) 전력 증폭기를 설계 및 제작하고 특성을 분석하였다. 차동 구조에 의해 짝수차 고조파 성분이 제거된다는 점에 착안하여 출력단의 일반적인 CMCD 회로의 병렬 공진기를 제거하고 inverse class-F 전력 증폭기를 push-pull 구조로 연결하여 CMCD 전력 증폭기를 설계하였다. 로드-풀 기법을 이용하여 GaN 소자 기반의 inverse class-F 및 이를 적용한 CMCD 전력 증폭기를 설계 및 제작하였다. 제작한 CMCD는 34.2 ㏈m의 출력과 64.5 %의 드레인 효율을 가지며, 이는 출력측에 공진기 구조를 가지는 일반적인 CMCD 전력 증폭기의 드레인 효율과 비교했을 때 13.6 %의 효율 향상을 가진다. In this paper, Current-Mode Class-D(CMCD) RF Power Amplifier(PA) is designed and implemented at 900 ㎒. Conventional CMCD PA has output parallel resonator to reconstruct a fundamental frequency component of the output signal. However the resonator can be removed by connecting inverse class-F PAs because even-harmonic components can be removed by CMCD PA’s push-pull structure. Using load-pull, inverse class-F PA with GaN transistors is designed, and CMCD PA with the inverse class-F PA is implemented. The CMCD PA has 64.5 % drain efficiency, 34.2 ㏈m output power. Comparing with the drain efficiency of a CMCD PA with parallel resonator, the CMCD with the inverse class-F technology has 13.6 % improved drain efficiency.
회전 광촉매반응기를 이용한 조류부산물 제거특성에 관한 연구
김영웅(Young Ung Kim),손희종(Hee Jong Son),유명호(Myung Ho Yu),김영희(Yeong Hee Kim),정종문(Jong Moon Jung),김철(Chul Kim) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.2
The photo catalytic oxidation using TiO_2 with UV light was tested to remove odorous and toxic by-products by algae. Among various kinds of photo catalytic oxidations, rotating disc system with coated TiO_2 on glass surface showed higher-removal efficiency with long term stability. To reduce the retention time of solution, higher rotation speed of disc was needed. 10 ㎍/L of geosmin and 2-MIB, and 4.0 ㎍/L of microcystin-LR were completely oxidized in 90 min and 120 min of the operation, respectively and 80% of 330 ㎍/L of chlorophyll-a was removed in 240 min of the operation.
김영웅(Youngwoong Kim),김대중(Daejoong Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
By the tighter emission regulation of vehicle durability, appropriate design for the PGM loading is essentially required due to its high price. Deterioration of catalyst will be described in structural, poisonous aspects and disclosed by the relation between simulated and field aged catalyst. BET method which is popular in elucidating Carrier surface area was used. This will be applicable for the prediction of PGM damage which is closely related to Carrier damage. BET could be regarded as one of major factors in catalyst design and test.
김영웅(Kim Young Woong),박관흠(Park Kwan Hum),홍성오(Hong Sung Oh) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
EuroNCAP(European New Car Assessment Program) announced recently a modified testing protocol for side impact assessment using the EUROSID-2 dummy instead of the EUROSID-l dummy. The EUROSID-2 dummy is identical in many parts with the EUROSID-1 dummy but shows different behavior in experiments. Hence, the development of a model for the ES-2 dummy is of great interest for the automotive engineers working in the field of safety. This paper shows a technique of improving occupant injury performance when using an EUROSID-2 dummy.
KSULEV FCC 최적화를 위한 programming 시도
김영웅(Youngwoong Kim),정종현(Chonghyeon Cheong),용승열(Seungryoul Yong) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
A state-of-art FCC technology has been strongly requested in order to achieve the most stringent emission requirement like PZEV. Appropriate TWC system, which is applicable for the reduction of both LOT and LOt should be established for this solution. In this paper GMK’s recent advanced calculation program (AU-53), which can offer more specific calculation including durability and poisoning effect than current program(AU-85), showed a good correlation with current ULEVII system. This can be extended to apply to PZEV especially predicting in LOt behavior during warm up condition. In this improved program cold start region can be also divided into three areas which have own characteristics regarding temperature profiles set by each RPM, A/F and even PGM’s combustion energy. In calculating catalyst oxidation and internal combustion energy we assumed more specific components rather propane as a model gas following ideal gas behavior in NMOG. This new programing achieved well correlation with SULEV vehicle rather ULEV applied to old Programming (AU-85). Lots of factors for AU-53 were requested in order to correlate test result as input data like engine RPM, A/F, engine displacement, catalyst loading, ratio and even cell density as was used same in AU-85. Consequently by combined major variables comprising of catalyst design we could take on appropriate LOt figures. Here in cold start research we can introduce significantly advanced programming technology comparing to conventional method. Optimized configuration of FCC system could be proposed in cost and performance including PGM loading, ratio and cell density
김영웅(Young-Wung Kim),이상진(Sang-Jin Lee),김규형(Kyu-Hyung Kim),이인수(In-Soo Lee) 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.2
본 논문에서는 농작물 생장환경요소인 온도, 습도, 산소, 이산화탄소와 유해가스인 암모니아, 황화수소, 휘발성 유기화합물 가스 등을 측정하기 위한 무선 센서 노드와 이들 가스의 복합적 환경에서 각 대상 가스별 농도추정 기능을 하는 가스분석 소프트웨어로 이루어진 작물생장환경 모니터링 시스템을 제안하다. 제안한 모델의 성능을 평가하기 위해 제작된 무선 센서 노드와 싱크 노드로 실험실 환경기반에서 무선으로 가스측정실험을 수행하였으며, 개발한 가스분석 소프트웨어로 단일가스 및 복합가스에 대한 각 대상별 가스 농도 추정이 가능함을 보였다.