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Pham Hoang Hien(Pham Hoang Hien ),Tran Thanh Tuan(Tran Thanh Tuan ) People&Global Business Association 2023 Global Business and Finance Review Vol.28 No.3
Purpose: This research investigates the role of employee trust and job satisfaction in the relationship between organizational culture and employee loyalty. Design/methodology/approach: The study was conducted among 355 healthcare professionals working in a private healthcare system in southern cities of Vietnam, including doctors, nurses, and other medical staff. The research method employed was partial least squared structure equation modeling (PLS-SEM) with SmartPLS software for data analysis. Findings: The findings indicate that organizational culture has a direct positive impact on employee loyalty and also affects employee trust and job satisfaction positively. Furthermore, employee trust and job satisfaction act as intermediaries and positively influence employee loyalty toward the organization. Research limitations/implications: The research acknowledges the limitation of the limited sample size and encourages further exploration of these relationships in other contexts. In addition, this study provides valuable insights for the management board of private healthcare organizations in southern cities of Vietnam on how to improve employee loyalty by cultivating a positive organizational culture, promoting employee trust, and enhancing job satisfaction. Originality/value: Overall, this research contributes significantly to the existing literature by examining the interplay between employee trust, organizational culture, job satisfaction, and employee loyalty.
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Hien D. Le,Jeng L. Huang,Hien D. Le 사단법인 한국계산역학회 2013 Computers and Concrete, An International Journal Vol.12 No.6
Ready-mixed soil material, known as a kind of controlled low-strength material, is a new way of soil cement combination. It can be used as backfill materials. In this paper, artificial neural network and non-linear regression approach were applied to predict the compressive strength of ready-mixed soil material containing Portland cement, slag, sand, and soil in mixture. The data used for analyzing were obtained from our testing program. In the experiment, we carried out a mix design with three proportions of sand to soil (e.g., 6:4, 5:5, and 4:6). In addition, blast furnace slag partially replaced cement to improve workability, whereas the water-to-binder ratio was fixed. Testing was conducted on samples to estimate its engineering properties as per ASTM such as flowability, strength, and pulse velocity. Based on testing data, the empirical pulse velocity–strength correlation was established by regression method. Next, three topologies of neural network were developed to predict the strength, namely ANN-I, ANN-II, and ANN-III. The first two models are back-propagation feed-forward networks, and the other one is radial basis neural network. The results show that the compressive strength of ready-mixed soil material can be well-predicted from neural networks. Among all currently proposed neural network models, the ANN-I gives the best prediction because it is closest to the actual strength. Moreover, considering combination of pulse velocity and other factors, viz. curing time, and material contents in mixture, the proposed neural networks offer better evaluation than interpolated from pulse velocity only.
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Amplify-and-Forward Two-Way Relay Networks: Error Exponents and Resource Allocation
Hien Quoc Ngo,Quek, T Q S,Hyundong Shin IEEE 2010 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.58 No.9
<P>In a two-way relay network, two terminals exchange information over a shared wireless half-duplex channel with the help of a relay. Due to its fundamental and practical importance, there has been an increasing interest in this channel. However, there has been little work that characterizes the fundamental tradeoff between the communication reliability and transmission rate across all signal-to-noise ratios. In this paper, we consider amplify-and-forward (AF) two-way relaying due to its simplicity. We first derive the random coding error exponent for the link in each direction. From the exponent expression, the capacity and cutoff rate for each link are also deduced. We then put forth the notion of bottleneck error exponent, which is the worst exponent decay between the two links, to give us insight into the fundamental tradeoff between the rate pair and information-exchange reliability in the two-way relay network. As applications of the error exponent analysis to design a reliable AF two-way relay network, we present two optimization framework to maximize the bottleneck error exponent, namely: i) the optimal rate allocation under a sum-rate constraint and its closed-form quasi-optimal solution that requires only knowledge of the capacity and cutoff rate of each link; and ii) the optimal power allocation under a total power constraint and perfect global channel state information, which is shown equivalently to a quasi-convex optimization problem. Numerical results verify our analysis and the effectiveness of the optimal rate and power allocations in maximizing the bottleneck error exponent, i.e. the network information-exchange reliability.</P>
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Hien-Trung Trinh,Eun-Ah Bae,Jung Joon Lee,Dong-Hyun Kim 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.12
To understand anti-allergic effect of Curcuma aromatica (family Zingerberaceae), which inhibited passive cutenous anaphylaxis (PCA) reaction in preliminary study, we isolated its main constituents, curcumin, demethoxycurcumin and bisdemethoxycurcumin, and investigated their inhibitory effects against PCA reaction and scratching behavior. These curcuminoids inhibited the PCA reaction induced by the IgE-antigen complex (IAC) and the scratching behavior induced by compound 48/80. These curcuminoids also inhibited degranulation, protein expression of TNF-α and IL-4, and transcription factor NF-κB activation in IAC-induced RBL-2H3 cells. Of these curcuminoids, curcumin exhibited the most potent inhibition, followed by demethoxycurcumin and bisdemethoxycurcumin. These findings suggest that curcuminoids, particularly curcumin, can improve the symptoms of allergic diseases, such as anaphylaxis and itching.
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Hien Thu Pham,이돈성,Tung Duy Dao,정현담 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Novel approach to fabricate In2O3 nanocrystal (NC)–π conjugated molecule 4,4′-ethyne-1,2-diyldibenzoic acid (EBA) hybrid materials by ligand exchange process, Sonogashira coupling reaction, and their utility as a lithium ion battery anode material have been developed. Here, discharge capacity of 900 mAh g−1, excellent rate performance under ultrahigh current density of 20 C, and initial Coulombic efficiency of 60% at moderate charging/discharging current density of 5 C after 100 cycles have been demonstrated, which are synergistically capable of overcoming the drawback of previous In2O3 material. The π–π network allows fast electron/Li+ transport and significant decrease in interfacial resistance in charge/discharge state.
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Hien Duy Mai,Suncheol Kim,Hyojong Yoo 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Oxygen evolution reaction (OER) is considered a major challenge in the production of efficientelectrochemical water splitting devices. To overcome the challenge, the development of inexpensiveelectrochemical catalysts with high energy conversion efficiencies is vital. Nanohybrids composed ofnoble metal nanoparticles and transition metal hydroxides often possess catalytically active sites that arebeneficial for OER performance. In this study, we report a successful synthesis of Ni(OH)2 nanoflowerswith a high degree of crystallinity and uniformity. The as-prepared Ni(OH)2 nanoflowers are employed astemplates for effective and controllable loading of Au nanodots to obtain Ni(OH)2@Au nanohybrids. Anexamination of the OER activity reveals that Ni(OH)2@Au nanohybrids exhibit a considerably loweroverpotential (h) value (390 mV) at a current density of 5 mA cm–2 and a smaller Tafel slope (120 mV dec–1) than those of Ni(OH)2 nanoflowers (540 mV and 324 mV dec–1, respectively). The OER enhancementeffect is mainly attributed to the decoration of Au nanodots, inducing charge transfer from Ni to Au andthereby stabilizing the Ni species at high oxidation levels. Moreover, the uniform loading of Au nanodotson the anisotropic Ni(OH)2 nanoflowers provides more active interfacial surfaces, which are expedient toOER.
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A Climatic Responsive Urban Planning Model for High Density City: Singapore's Commercial District
Hien, Wong Nyuk,Jusuf, Steve Kardinal,Samsudin, Rosita,Eliza, Anseina,Ignatius, Marcel Sustainable Building Research Center 2011 International journal of sustainable building tech Vol.2 No.4
Local climate condition and urban morphology affect air temperature generated within urban canopy layer which related to urban heat island (UHI) intensity and later impacts on outdoor thermal comfort and urban energy usage. Climatic responsive urban planning by careful consideration on urban morphology parameters of urban corridor width, building height, urban surface materials, sky view factor (SVF) and vegetation help to improve urban environment quality. This study mainly focuses on commercial district and observes impacts of various urban structures configurations towards air temperature by interpolating climatic and urban morphology predictors. The urban structures indeed show relation with level of air temperature generated although vegetation also contributes in reducing air temperature through its evapotranspiration process. Therefore the understanding of relation between urban morphology with thermal performance and UHI benefits in future urban planning and development.
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Hien, Tran Thi,Oh, Won Keun,Nguyen, Phi Hung,Oh, Seok Jeong,Lee, Moo Yeol,Kang, Keon Wook American Society for Pharmacology and Experimental 2011 Molecular pharmacology Vol.80 No.6
<P>We revealed previously that nectandrin B isolated from Myristica fragrans (nutmeg, Myristicaceae) functions as a potent AMP-activated protein kinase (AMPK) activator and showed its antiobesity effect. In this study, we investigated whether nectandrin B affects phosphorylation of endothelial nitric-oxide synthase (eNOS) in human endothelial cells. Nectandrin B increased the phosphorylation of eNOS and nitric oxide (NO) production in a concentration-dependent manner and maximal effect was found at 10 관g/ml. Nectandrin B activates AMPK, presumably via Ca(2+)/calmodulin kinase II activation and nectandrin B-stimulated eNOS phosphorylation was reversed by AMPK inhibition. Both the enzyme activity of phosphatidylinositol 3-kinase (PI3K) and the estrogen receptor (ER)-dependent reporter gene transcription were enhanced by nectandrin B. ER관 inhibition by specific antagonist or small interfering siRNA (siRNA) suppressed nectandrin B-mediated eNOS phosphorylation. Moreover, AMPK inhibition significantly reversed the activation of ER-dependent transcription and PI3K activation in response to nectandrin B. Nectandrin B evoked endothelium-dependent relaxation in rat aortic rings, and this was blocked by inhibition of AMPK, ER, or PI3K. These results suggest that potent AMPK activator nectandrin B enhances NO production via eNOS phosphorylation in endothelial cells and ER관-dependent PI3K activity is required.</P>
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