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Advanced Magnetic Materials Produced by Using Rapid Quenching Technology
Nguyen Hoang Nghi,Nguyen Van Dung,Trinh Thi Thanh Nga,Bui Thi Khanh Nhung,Mai Thanh Tung,Nguyen Huu Tinh,Hoang Nhat Hieu,Bui Xuan Chien,Nguyen Thi Hong Tam 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.6
Amorphous alloys produced by using a rapid quenching technique are considered to be a precursor for producing nanosized and multiphase structures by precipitation (the top-down method). By using this technique, several new magnetic materials with different magnetic properties based on different physical mechanisms have been manufactured and investigated. Three new magnetic materials, a nanocrystalline soft magnetic material, a soft-hard permanent magnet and a Me-3d granular alloy with a GMR effect, what were prepared under local conditions, are presented and discussed in the experimental point of view. Amorphous alloys produced by using a rapid quenching technique are considered to be a precursor for producing nanosized and multiphase structures by precipitation (the top-down method). By using this technique, several new magnetic materials with different magnetic properties based on different physical mechanisms have been manufactured and investigated. Three new magnetic materials, a nanocrystalline soft magnetic material, a soft-hard permanent magnet and a Me-3d granular alloy with a GMR effect, what were prepared under local conditions, are presented and discussed in the experimental point of view.
The Impact of Cash Flow Statement on Lending Decision of Commercial Banks: Evidence from Vietnam
Dung Duc NGUYEN,Anh Huu NGUYEN 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.6
The paper investigates the impact of the statement of cash flows of listed companies on lending decisions of commercial banks in the context of Vietnam. Survey data for the research were collected from 160 credit officers of Vietnamese commercial banks for short-term and long-term lending decisions, whether the cash flow statement includes complete information or has a lack of information. The cash flow statement, in which the information on the cash flow is completely contrary to the profit information on the income statement is examined. This paper employed T-tests to address the research issues in a market considered to be ineffective, like Vietnam. The research results show: (1) the information on the cash flow statement affects both the short-term and long-term lending decisions of credit officers, and (2) the lack of information on the cash flow statement in both cases of positive and negative profits affects the comfort and confidence of credit officers in making decisions. The research findings also indicate that cash flow statements are important for lending decisions of credit institutions in Vietnam. Therefore, this paper provides a new insight to managers on how to improve the quality of cash flow statement to meet the needs of lenders.
RDB 및 웨이블릿 예측 네트워크 기반 단일 영상을 위한 심층 학습기반 초해상도 기법
응우엔휴(Nguyen, Huu Dung),김응태(Kim, Eung-Tae) 한국방송·미디어공학회 2019 한국방송공학회 학술발표대회 논문집 Vol.2019 No.6
단일 영상 초해상도 (Single Image Super-Resolution - SISR)기법은 카메라로 획득된 저해상도 영상에 필터 기반의 연산을 적용하여 좋은 화질의 고해상도 영상을 복원하는 과정이다. 최근에 심층 합성곱 신경망 학습의 발전에 따라 단일 영상 초해상도에 적용되는 심층 학습 기법들은 좋은 성과를 보여 주고 있다. 본 논문은 단일 영상 초해상도 성능을 개선하기 위해 웨이블릿 예측 네트워크를 효율적으로 적용하는 방법에 대해 연구하였으며, 저해상도 입력 영상의 특징을 잘 추출해내기 위해 네트워크 내부에 RDB를 적용하여 기존 방식보다 효율적으로 고해상도 영상 복원하는 기법을 제안한다. 모의실험을 통해 제안하는 방법이 기존 방법보다 화질은 약 PSNR 0.18dB만큼 우수하며 속도는 1.17배 빠른 것을 확인하였다.
Vo, Dung The,Murrell, Darwin,Dalsgaard, Anders,Bristow, Glenn,Nguyen, Dung Huu,Bui, Thanh Ngoc,Vo, Dung Thi The Korea Society for Parasitology and Tropical Me 2008 The Korean Journal of Parasitology Vol.46 No.2
Fishborne zoonotic metacercariae have not been reported from brackish water and marine fish from Vietnam waters although these parasites are common in the country's freshwater fish. Both wild-caught and cultured grouper (Epinephelus coioides and Epinephelus bleekeri), and mullet (Mugil cephalus) from brackish and marine waters located in Khanh Hoa province in central coastal Vietnam were examined, and found positive for zoonotic trematode metacercariae. From grouper, Heterophyopsis continua and Procerovum varium were recovered. The prevalence of H. continua ranged from 2.0 to 6.0% and that for P. varium ranged from 11.6 to 15.8%. Mullet were infected with Pygidiopsis summa and H. continua; both of these species are new records for Vietnam. The prevalence of P. summa in mullet was generally high, ranging from 17.6 to 75.5%, and was significantly higher than the prevalence of H. continua (2.5 to 32.4%). There were no significant differences in the prevalence of metacercariae between grouper from natural or cultured habitats, indicating that the highest risk of infection occurs in the wild-caught state prior to their placement in culture. Further, there was no difference in metacercarial prevalence between the 2 species of grouper. Infected wild-caught seed were only observed from January to October. Monthly variation in prevalence suggests seasonal variation in mullet infections occurs in this region with the highest transmission taking place from October to December. Basic investigations on the ecology and epidemiology of these intestinal flukes need to be carried out to determine their significance as a public health problem and the aspects of their biology that may be vulnerable to control interventions.
응웬티투이덩(Nguyen Thi Thuy Dung),호응옥끄엉(Ho Ngoc Cuong),응웬반흐우(Nguyen Van Huu) 영남대학교 박정희새마을연구원 2021 새마을학연구 Vol.6 No.2
이 연구에서는 지속가능한 토지관리(SLM))의 위험선호에 관한 기존의 연구들을 통해 SLM의 적용시 농부들의 의사결정에 영향을 미치는 결정요인을 찾고자 하였다. 선호요인은 SLM에 결정적인 영향을 미치는 요인으로 본 연구에서는 54개의 기존 연구를 통해 SLM의 구성요소, SLM의 채택에 미치는 위험선호 개념을 분석하였다. 상당수의 연구에서 SLM 채택의 중요한 측면으로서 농민의 사회-인구학적 특성, 농장 관련 특성, 농장 관리 관행 및 제도적 특성과 같은 가구 특성에 초점을 맞추고 있다는 것을 알 수 있었다. 반면, SLM을 채택하는데 필수요인인 위험 선호도를 논의한 연구는 거의 찾을 수 없었다. 이는 기존의 연구에서는 위험선호 요인에 대한 고려가 간과된 것을 의미한며, 나아가 농가의 행동을 이해하기 위해서는 SLM 도입에 관한 연구에 위험선호 요인이 포함될 필요가 있음을 의미한다. 본 연구에서는 SLM 관행의 기술 채택 및 적용 비율을 증가시킴으로, 위험에 덜 노출되는 방안의 모색으로 보험, 보조금, 작물 다양화, 농장 소득 증대, 농장 외 활동 생산, 효과적인 기술 촉진, 계약 농업, 더 나은 양질의 교육 및 자문 서비스에 대한 접근과 같은 정책적 시사점을 제시하고자 한다. The study aims to review existing literature and studies on risk preferences of Sustainable Land Management (hereinafter SLM). In addition, this paper explores the determinants that affect farmers decisions on the implementation of SLM. The risk preference is a decisive influencing element of the SLM. By reviewing 54 research studies, the paper has synthesized the concepts of risk preferences, SLM and components, and risk preferences that influence the adoption of SLM through systematic and integrative review methodologies. Many studies have examined the elements of SLM and risk preferences that affect the adoption of SLM. Almost all studies focused solely on household characteristics such as the socio-demographic characteristics of farmers, farm-related features, farm management practices, and institutional characteristics as the critical aspects of SLM adoption. In contrast, few studies discussed risk preferences as the essential part of SLM adoption. The result indicated that risk preferences were omitted, and we suggest that the risk preferences should be added to the SLM adoption studies to understand farm household behavior. Our paper seeks to reduce the risk exposure by increasing the rate of technology adoption and application of SLM practices.
Nguyen Van Quyet,Luong Huu Bac,Dang Duc Dung 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.8
In this work, a strong enhancement of the electric-field-induced strain in Bi0.5(Na,K)0.5TiO3- based ceramics was observed via lithium(Li) addition. The Li-added Bi0.5(Na,K)0.5TiO3-based ceramics exhibited a strain of 0.40% under an electric field of 6 kV/mm, which was almost twice the value without the Li dopant (0.21%). We obtained the highest Smax/Emax value of 668 pm/V for 4-mol% Li addition, which was due to the phase transition from pseudocubic to rhombohedral symmetry and/or to the distorted tetragonal structure. We suggest that controlling the phase transition in ferroelectric materials is a way to enhance the electric-field-induced giant strain and that the phase transition from the non-polar phase to the polar phase results in a giant electric-fieldinduced strain, which overcomes the result due to the phase transition from the polar phase to the non-polar phase and/or the distorted structure. We expect our work to open new ways to enhance the electric-filed-induced giant strain to a value that is comparable to the value for Pb(Zr,Ti)O3 (PZT)-based ceramics.