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Factors Affecting Night-Time Economic Development: Research in Hanoi, Vietnam
Ngoc Son NGUYEN(Ngoc Son NGUYEN ),Vu Hiep HOANG(Vu Hiep HOANG ),Quoc Dung NGO(Quoc Dung NGO ),Van Hoa HOANG(Van Hoa HOANG ) 한국유통과학회 2023 Asian Journal of Business Environment (AJBE) Vol.13 No.2
Purpose: The purpose of the study is to explore the factors which influence the night-time economic development in Hanoi, Vietnam. The results can help policymakers achieve a scientific basis to plan the development of night-time economy in Hanoi. Research design, data and methodology: The research model is developed from literature review with 7 independent variables, including natural conditions and resources, infrastructure, safety, environmental issues, promotion and international integration, development of sharing economy, and institution and policy. This model is then adjusted by exploratory factors analysis to have 4 new variables: Institution and environment, Infrastructure and safety, Promotion and sharing, and Nature and resources. The model is regressed based on the data of 463 observations of night-time economy in Hanoi, Vietnam. Results: Consistent with the current literature addressing night-time economy, the results show positive impacts of all of the independent variables studied. Conclusions: It is recommended for the local authorities to strengthen advertising and promoting investment for NTE development in Hanoi city and also enhance the role of state management in NTE activities by raising awareness of the state management apparatus towards a more open-minded multi-dimensional view of the NTE, developing the NTE to overcome the barrier of thinking “if it cannot be managed, it is forbidden” in state management agencies, and defining responsibilities and authority among state management agencies in the management of NTE activities and strengthening decentralization and decentralization of powers for localities in the management and development of NTE.
DNA fluorescence switching system for constructing DNA memory chip
Hoang Hiep Nguyen,Moonil Kim 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
The potential effectiveness of fluorescence switching-based optical encoding system is presented with a series of wet experiments, in which rewriting and randomly accessing of data was successfully achieved on a microfluidic chip. As a combination of biology and computer science, our method offers not only an alternative for information storage device but also an approach to overcome the obstacle of current existing read-only encoding methods. Besides, with the use of fluorescence switching and DNA manipulation techniques, the current approach eliminates the need for expensive and bulky sequencing machinery as well as error-prone long DNA strand synthesis, and allowed for simple and easy error handling of data. Although this study demonstrated a minuscule amount of encoded text data, at least it is demonstrated that a DNA-based fluorescence switching system could be potentially useful to fabricate a rewritable and randomly accessible digital information storage device on microfluidic chip platform.
Energy-Efficient Base Station Operation in Heterogeneous Cellular Networks
Nguyen, Hoang-Hiep,Hwang, Won-Joo Korea Multimedia Society 2012 멀티미디어학회논문지 Vol.15 No.12
In this paper, we study the ON/OFF control policy of base stations in two-tier heterogeneous cellular networks to minimize the total power consumption of the system. Using heterogeneous cellular networks is a potential approach of providing higher throughput and coverage compared to conventional networks with only macrocell deployment, but in fact heterogeneous cellular networks often operates regardless of total power consumption, which is a very important issue of modern cellular networks. We propose a policy that controls the activation/deactivation of base stations in heterogeneous cellular networks to minimize total power consumption. Under this policy, the total power consumed can be significantly reduced when the traffic is low while the QoS requirement is satisfied.
A Portable Surface Plasmon Resonance Biosensor for Rapid Detection of Salmonella typhimurium
Nguyen, Hoang Hiep,Yi, So Yeon,Woubit, Abdela,Kim, Moonil The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.3
Here, the rapid detection of Salmonella typhimurium by a portable surface plasmon resonance (SPR) biosensor in which the beam from a diode laser is modulated by a rotating mirror is reported. Using this system, immunoassay based on lipopolysaccharides (LPS)-specific monoclonal anti-Salmonella antibody was performed. For the purpose of orientation-controlled immobilization of antibodies on the SPR chip surface, the cysteine-mediated immobilization method, which is based on interaction between a gold surface and a thiol group (-SH) of cysteine, was adopted. As a result, using the portable SPR-based immunoassay, we detected S. typhimurium in the range from 10^7 CFU/mL to 10^9 CFU/mL within 1 hour. The results indicate that the portable SPR system could be potentially applied for general laboratory detection as well as on-site monitoring of foodborne, clinical, and environmental agents of interest.
Distributed Scheduling and Discrete Power Control for Energy Efficiency in Multi-Cell Networks
Hoang-Hiep Nguyen,Won-Joo Hwang IEEE 2015 IEEE communications letters Vol.19 No.12
<P>Distributed resource allocation for energy efficiency is an important issue in wireless cellular networks. While most of the existing works in literature consider continuous transmit power, in practical systems such as 3GPP LTE networks, the downlink transmit power is quantized into discrete levels. Moreover, how to apply those power control schemes into such systems is not specified, so one can consider a simple rounding scheme, however, the optimality, convergence, and uniqueness may not be preserved. Therefore, in this letter, we propose a distributed resource allocation for energy efficiency in multi-cell wireless networks, considering discrete power control. We formulate the problem as a fractional discrete optimization problem, show its NP-hardness, and propose a suboptimal polynomial time solution by exploiting the convenience of non-linear fractional programming. The algorithm is executed before each transmission interval, and in each iteration, each base station first assigns the user for the radio resource and then updates the transmit power using a randomized procedure. Simulations are provided to evaluate the convergence and advantages of the proposed algorithm.</P>
An Overview of Techniques in Enzyme Immobilization
Nguyen, Hoang Hiep,Kim, Moonil The Korean Vacuum Society 2017 Applied Science and Convergence Technology Vol.26 No.6
Immobilized enzymes have become the subject of considerable interest due to their excellent functional properties such as reusability, cost-effectiveness, and optimality during the past decades. Enzyme immobilization technology is not only used in industrial processes, but also a component technology of products for medical diagnostics, therapy, food industry, bio energy, and biomaterial detection. In this review, new methods for enzyme immobilization are introduced, and the advantages and disadvantages of a variety of techniques in enzyme immobilization will be also discussed.
A Portable Surface Plasmon Resonance Biosensor for Rapid Detection of Salmonella typhimurium
Hoang Hiep Nguyen,이소연,Abdela Woubit,김문일 한국진공학회 2016 Applied Science and Convergence Technology Vol.25 No.3
Here, the rapid detection of Salmonella typhimurium by a portable surface plasmon resonance (SPR) biosensor in which the beam from a diode laser is modulated by a rotating mirror is reported. Using this system, immunoassay based on lipopolysaccharides (LPS)-specific monoclonal anti-Salmonella antibody was performed. For the purpose of orientation-controlled immobilization of antibodies on the SPR chip surface, the cysteine-mediated immobilization method, which is based on interaction between a gold surface and a thiol group (-SH) of cysteine, was adopted. As a result, using the portable SPR-based immunoassay, we detected S. typhimurium in the range from 10^7 CFU/mL to 10^9 CFU/mL within 1 hour. The results indicate that the portable SPR system could be potentially applied for general laboratory detection as well as on-site monitoring of foodborne, clinical, and environmental agents of interest.
An Overview of Techniques in Enzyme Immobilization
Hoang Hiep Nguyen,김문일 한국진공학회 2017 Applied Science and Convergence Technology Vol.26 No.6
Immobilized enzymes have become the subject of considerable interest due to their excellent functional properties such as reusability, cost-effectiveness, and optimality during the past decades. Enzyme immobilization technology is not only used in industrial processes, but also a component technology of products for medical diagnostics, therapy, food industry, bio energy, and biomaterial detection. In this review, new methods for enzyme immobilization are introduced, and the advantages and disadvantages of a variety of techniques in enzyme immobilization will be also discussed.