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Thuy Dung PHAM THI1,Anh Tin NGO2,Nam Tien DUONG3,Van Kien PHAM4 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5
The purpose of this study is to evaluate the impact of organizational culture on job satisfaction and organizational commitment among employees in small and medium-sized enterprises in Ho Chi Minh City, Vietnam. The study hypothesized that organizational culture has a significant influence on employees’ satisfaction and that satisfaction also significantly impactsorganizational commitment among employees. The data are collected from a sample of 240 office employees. Structural Equation Modeling is used to determine the influence of organizational culture dimensions,including open working environment, salary, and rewards, empowerment, management style, corporate values, on employees’ satisfaction and organizational commitment. The findings showed that the five dimensions of organizational culture positively impact employees’ satisfaction and that job satisfaction significantly influences organizational commitment. Thus, job satisfaction serves as the bridge between organizational culture and commitment. The current study contributes to providing a practical insight into the relationships between organizational culture, employees’ job satisfaction, and organizational commitment. Based on that, managers can develop suitable personnel policies for their organizations to simultaneously enhance employees’ performance and satisfaction, which makes them stay with the company.
Tien-Dung Chu,Thi-Thuy-Phuong Doan,Duy-Truong Quach,Xuan-Tuyen Nguyen,Tuan-Son Nguyen,Duc-Thang Pham,Dong-Hyun Kim 한국자기학회 2020 Journal of Magnetics Vol.25 No.1
In this research, a simple method has been presented to synthesize the magnetic - semiconductor Fe₃O₄/TiO₂ heterostructure nanocomposites via three steps: firstly, synthesis of Fe₃O₄ nanoparticles by co-precipitation method; thereafter, formation of Fe₃O₄/TiO₂ composites by sol-gel method; finally, annealing to form Fe₃O₄/TiO₂ anatase (denoted as Fe₃O₄/TiO₂-A) and Fe₃O₄/TiO₂ rutile (denoted as Fe₃O₄/TiO₂-R) heterostructure nanocomposites, respectively. The results of X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy show that the Fe₃O₄/TiO₂-A and Fe₃O₄/TiO₂-R heterostructure nanocomposite samples contain both magnetite (Fe₃O₄) and semiconductor TiO₂ (anatase or rutile phase, respectively). The asprepared nanocomposite samples exhibit superparamagnetic properties at room temperature with high saturation magnetization (Ms) above 19.5 emu/g at the applied magnetic field of 11 kOe. Moreover, the Fe₃O₄/TiO₂-A and Fe₃O₄/TiO₂-R heterostructure nanocomposites with a low band gap energy of 2.89 eV and 2.81 eV, respectively, are promising to enhance the performance of photocatalytic activities in the visible light region for application in wastewater treatment.
Energy Management for Mobile Virtual Desktop Infrastructure in Mobile Cloud Environment
Tien-Dung Nguyen(누엔티엔융),Pham Phuoc Hung(밤복홍),Eui-Nam Huh(허의남) 한국정보과학회 2014 정보과학회 컴퓨팅의 실제 논문지 Vol.20 No.8
최근 모바일 가상 데스크톱 인프라(mobile virtual desktop infrastructure)이 모바일 장치에서 클라우드 자원을 활용하기 위한 해결 방법으로 등장하였다. 가상 머신을 원격으로 조정함으로써 컴퓨팅 작업이 모바일 장치에서 처리되는 대신 데이터 센터로 옮겨가게 되었다. 그러나 모바일 장치로 원격 데스크톱 서비스를 이용하는 것은 PC에서와는 달리 전화 통화, 메시지, 배터리, wifi/3G, 운영체제, 오류 등의 이유로 잠시 접속이 끊어질 수 있다. 에너지 소비 절약을 위하여 이와 같이 모바일 장치가 다시 서비스를 제공하기 전까지 동작하고 있는 가상 머신들은 절전 상태로 변경될 필요가 있다. 그리하여 본 논문에서 우리는 데이터 센터의 가상 머신 상태를 관리하기 위한 에너지 정책을 제안하였다. 성능 평가를 위한 시뮬레이션을 통해서 제안하는 관리 방법이 모바일 클라우드 환경에서 약 74.5%의 에너지 절약을 할 수 있음을 보였다. Recently, mobile virtual desktop infrastructure (mVDI) has emerged as a solution for mobile devices to utilize cloud resources. By remotely controlling virtual machines (VMs), all heavy computing tasks are moved to data center instead of processing at mobile devices. However, using remote desktop service by mobile devices is different from by PC; remote services can be temporarily disconnected by phone call, message, battery, wifi/3G, OS errors, etc. To save energy consumption, those running VMs should be changed to lower power states until mobile devices resume services. In this paper, we propose an energy efficiency policy to manage VMs states in data center. The simulation results show that our solution can save around 74.5% energy consumption in mobile cloud environment.
The Impact of Contingency Factors on Management Accounting Practices in Vietnam
PHAM, Duc Hieu,DAO, Thi Huong,BUI, Tien Dung Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.8
The aim of this study is two-fold. Firstly, it attempts to assess the level of management accounting practices (MAPs) in manufacturing companies in Vietnam. Secondly, it purports to explore the impact of potential contingency factors on the current level of MAPs in the sample of studied companies from the industrial sector in Vietnam. The study examines the hypotheses that MAPs in Vietnamese manufacturing firms are affected by a range of contingent variables. A quantitative research was conducted by sending questionnaires to the target respondents that comprise both accountants and managers in 160 manufacturing enterprises in the north of Vietnam. The first main findings from the study reveal that MAPs in Vietnam are mainly traditional rather than contemporary ones, and oriented toward the short-term rather than the long-term. The second main research findings resulted from multiple regression model show that MAPs in Vietnam are significantly affected by company size, commitment of directors, advanced manufacturing technology, and distinct number of products. However, no significant associations are found between MAPs and intensity of competition from the emerging market as hypothesized in this study. Research findings are bases for recommendations to promote the application of contemporary practices and enhance management accounting functions in manufacturing companies in Vietnam.
A DTC Stator Flux Algorithm for the Performance Improvement of Induction Traction Motors
Pham Van-Tien,Trillion Q. Zheng,Zhong-ping Yang,Fei Lin,Viet-dung Do 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
In view of the speed control characteristics of induction traction motors and the problems of direct torque control (DTC) algorithms in current applications, this paper presents a DTC algorithm characterized by a symmetrical polygon flux control and a closed loop power control in the constant-torque base speed region and constant-power field-weakening region of induction traction motors. This algorithm only needs to add a stator flux control algorithm to the traditional DTC structures. This has the benefit of simplicity, while maintaining the features of traditional algorithms such as a rapid dynamic response, uncomplicated control circuit, reduced dependence on motor parameters, etc. In addition, it obtains a smoother flux trajectory that is conducive to improvement of the harmonic elimination capability, the switching frequency utilization as well as the torque and power performance in the field-weakening region. The effectiveness and feasibility of this DTC algorithm are demonstrated by both theoretical analysis and experimental results.
Tien Ngoc DAO,Ha Thi Thu LE,Phuong Thi Mai CHU,Ngan Hoang PHAM,Trang Thi Dai LUONG,Dung Tri TRAN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.12
Guided by a resource-based theory, this study is the first one that takes a quantitative approach to identify determinants of competitiveness of women-owned small and medium enterprises (SMEs) in Vietnam. The study employs time series data of Vietnamese SMEs extracted from the Vietnam Small and Medium Enterprises Survey conducted biennially from 2005 to 2015 in ten Vietnamese provinces. Firm competitiveness hereby is indicated by revenue, market share, profitability, and export volume. The research reveals a number of determining factors, of all, research and development, labor skills, business environment, technology investment are the most important factors, followed by capital and headcount. It is indicated that the determining factors have different influences on competitiveness obtained by different measurements. Therefore, it is based on specific targets and situations to make wise business decisions. The authors also make comparisons among groups of women-owned enterprises divided by their firm age, location, ownership, export, age, and educational background of business owners. The findings serve as critical empirical evidence and provide policy recommendations for improving the competitiveness of women-owned SMEs in Vietnam. The recommendations range from technology support, education and professional support for female entrepreneurs, access to capital and human resources to business environment improvement.
A DTC Stator Flux Algorithm for the Performance Improvement of Induction Traction Motors
Van-Tien, Pham,Zheng, Trillion Q.,Yang, Zhong-ping,Lin, Fei,Do, Viet-dung The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
In view of the speed control characteristics of induction traction motors and the problems of direct torque control (DTC) algorithms in current applications, this paper presents a DTC algorithm characterized by a symmetrical polygon flux control and a closed loop power control in the constant-torque base speed region and constant-power field-weakening region of induction traction motors. This algorithm only needs to add a stator flux control algorithm to the traditional DTC structures. This has the benefit of simplicity, while maintaining the features of traditional algorithms such as a rapid dynamic response, uncomplicated control circuit, reduced dependence on motor parameters, etc. In addition, it obtains a smoother flux trajectory that is conducive to improvement of the harmonic elimination capability, the switching frequency utilization as well as the torque and power performance in the field-weakening region. The effectiveness and feasibility of this DTC algorithm are demonstrated by both theoretical analysis and experimental results.
An Empirical Study on Consumer Behavior towards Food and Beverage Services in Vietnam
Nam Tien DUONG,Quynh LE HUA XUAN,Thuy Dung PHAM THI,Van Kien PHAM,Na LE 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
Vietnam is an ideal place in Southeast Asia to expand the food and beverage (F&B) business thanks to stable politics, favorable economic conditions, a young population, and an increasing middle class. Yet Vietnam still poses challenges for the F&B industry wanting to invest in the country. The study aims to identify and evaluate the factors impacting consumer behavior towards F&B services in Vietnam, particularly emerging F&B services. Based on previous studies, we proposed six factors (social influence, service, price, food, atmosphere, and location with 26 observed items) in F&B services that may have a big impact on consumer behavior. The data is collected from 300 consumers who used to use local F&B services. The findings show that socialinfluence, service, price, and food are the four most influential factors. The other two factors such as atmosphere and location have no significant impact on consumer behavior. Besides, there is no difference between consumer groups in terms of income and age. Hence, the current study offers practical insights into the factors that have a significant impact on consumer behavior in F&B services. As such, the findings of this study could assist practitioners in developing a strategic business plan for sustainable development in the F&B industry.