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Le Duc Anh Ho,Hojun Kim(김호준),Vu Binh Nam,Daeho Lee(이대호) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We present a facile method for synthesizing a large-scale, well-dispersed copper oxide (CuO<SUB>x</SUB>) nanoparticle (NP) ink. The uniform CuO<SUB>x</SUB> thin films prepared using the synthesized NP ink by spin coating were applied to a laser digital patterning process, obtaining finely-structured Cu electrodes with the low resistivity of 10.5 μΩ cm. By controlling the software embedded in the laser scanning system, Cu-grid with a low sheet resistance (8.45 Ω·sq<SUP>−1</SUP>) and high transmittance (87.4% at 550 nm) were achieved. Furthermore, the effect of polyvinylpyrrolidone ratio, which was used as a dispersing agent in the NP ink and a reducing agent in the laser process, was carefully examined in detail. The superior stability of the Cu electrodes on the substrates was confirmed using various tests including bending and twisting, cyclic bending, and tape pull tests. Finally, a flexible transparent touchscreen panel based on Cu electrodes was fabricated to demonstrate a possible application.
Duc-Hoc Tran,Long Luong-Duc,Minh-Tin Duong,Trong-Nhan Le,Anh-Duc Pham 한국CDE학회 2018 Journal of computational design and engineering Vol.5 No.2
Construction managers often face with projects containing multiple units wherein activities repeat from unit to unit. Therefore effective resource management is crucial in terms of project duration, cost and quality. Accordingly, researchers have developed several models to aid planners in developing practical and near-optimal schedules for repetitive projects. Despite their undeniable benefits, such models lack the ability of pure simultaneous optimization because existing methodologies optimize the schedule with respect to a single factor, to achieve minimum duration, total cost, resource work breaks or various combinations, respectively. This study introduces a novel approach called ‘‘opposition multiple objective symbiotic organisms search” (OMOSOS) for scheduling repetitive projects. The proposed algorithm used an opposition-based learning technique for population initialization and for generation jumping. Further, this study integrated a scheduling module (M1) to determine all project objectives including time, cost, quality and interruption. The proposed algorithm was implemented on two application examples in order to demonstrate its capabilities in optimizing the scheduling of repetitive construction projects. The results indicate that the OMOSOS approach is a powerful optimization technique and can assist project managers in selecting appropriate plan for project.
Tran Anh Duc,Le Thi Phuong Linh,Nguyen Thi Anh Nguyet 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
The taxonomy of Asclepios species is revised. Asclepios shiranui (Esaki, 1924), A. coreanus Esaki, 1930, and A. coreanus miyamotoi Esaki, 1937 are all determined to be junior synonyms of Asclepios apicalis (Esaki, 1924). A new species, Asclepios esakii sp. nov. from northern Vietnam, is described. Because Ascleopios apicalis and A. esakii sp. nov. co-exist in some localities, comparative characters for separating female specimens of two species are established. The revised key to species of Asclepios is also provided. Asclepios annandalei Distant, 1915 is reported from Vietnam for the first time; and the occurrence of A. apicalis (Esaki, 1924) is also updated. LSID: https://zoobank.org/urn:lsid:zoobank.org:pub:3A2BBFBA-4509-4DDE-A7AB-E3A65AE82E3F.
다중방향 릴레이 시스템을 위한 자가간섭 소거 보조 릴레이 빔형성 기법
레덕안(Anh Duc Le),박진배(Jin Bae Park),조용옥(Yong Ok Cho),정민아(Min A Jeong),이성로(Seong Ro Lee),김윤희(Yun Hee Kim) 한국통신학회 2013 韓國通信學會論文誌 Vol.38 No.4(융합기술)
본 논문은 N 통신노드들이 다중 안테나 비재생 릴레이국의 협력으로 서로 데이터를 교환하는 다중방향 릴레이 시스템을 제안한다. 기존의 단방향 릴레이를 적용한 다중방향 통신의 경우 2N 전송 단계가 필요하나 제안하는 다중방향 릴레이 시스템은 단일 다중접속 단계와 N-1 방송 단계로 구성된 총 N 전송 단계만 필요로 한다. 특히 효율적인 방송 단계 전송을 위해 통신노드들을 쌍을 짓고 쌍이 아닌 통신노드들에게 간섭을 주지 않는 새로운 릴레이 빔형성 행렬과 통신노드 자가간섭 소거기를 제안한다. 평균 합 전송률로 성능을 평가한 결과, 제안 기법이 기존 기법의 성능을 향상시키며 그 이득은 릴레이 노드 안테나 수와 통신노드 수가 비슷할 때 더 커짐을 볼 수 있다. 이러한 제안 기법은 여러 선박간의 정보를 공유할 필요가 있는 해양 통신 환경에서 통신 거리를 확장하는 데 효과적으로 적용할 수 있을 것으로 기대된다. In this paper, we propose a multi-way relaying system, in which N communicating nodes interchange their information one another by the help of a multiple-antenna non-regenerative relay station (RS). While the conventional multi-way relaying requires 2N transmission phases to complete the data exchange, the proposed system completes the mission with N phases composed of one multiple access phase and N-1 broadcast phases. For effective broadcast transmission, the proposed system pairs users for signal transmission with a new RS beamforming matrix not to interfere with the nodes of different pairs and a self-interference canceler at each node. The performance evaluation in terms of the average sum rate shows that the proposed system outperforms the conventional one with more significant gain when the number of RS antennas is comparable to the number of communicating nodes. The proposed schemes can be applicable to marine communications where the ships need to share their information with extended coverage.
Hoang, Van Minh,Le, Hong Chung,Kim, Bao Giang,Duong, Minh Duc,Nguyen, Duc Hinh,Vu, Quynh Mai,Nguyen, Manh Cuong,Pham, Duc Manh,Ha, Anh Duc,Yang, Jui-Chen Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Two years after implementation of the graphic health warning intervention in Vietnam, it is very important to evaluate the intervention's potential impact. The objective of this paper was to predict effects of graphic health warnings on cigarette packages, particularly in reducing cigarette demand and smoking-associated deaths in Vietnam. In this study, a discrete choice experiment (DCE) method was used to evaluate the potential impact of graphic tobacco health warnings on smoking demand. To predict the impact of GHWs on reducing premature deaths associated with smoking, we constructed different static models. We adapted the method developed by University of Toronto, Canada and found that GHWs had statistically significant impact on reducing cigarette demand (up to 10.1% through images of lung damage), resulting in an overall decrease of smoking prevalence in Vietnam. We also found that between 428,417- 646,098 premature deaths would be prevented as a result of the GHW intervention. The potential impact of the GHW labels on reducing premature smoking-associated deaths in Vietnam were shown to be stronger among lower socio-economic groups.