Preparation of TiO₂-Coated Polypropylene Beads by PCVD Process for Phenol Removal

Hung Cuong Pham,Dong-Joo Kim,Kyo-Seon Kim 한국표면공학회 2009 한국표면공학회 학술발표회 초록집 Vol.2009 No.10

Uniform Coating of TiO₂ Thin Films on Polypropylene Particles by Plasma Chemical Vapor Deposition Process

Hung Cuong Pham,Dong-Joo Kim,Kyo-Seon Kim 한국표면공학회 2009 한국표면공학회 학술발표회 초록집 Vol.2009 No.-

We coated TiO₂ thin films on particles by a rotating cylindrical plasma chemical vapor deposition (PCVD) process and investigated the effects of various process variables on the morphology and growth of thin films. The polypropylene (PP) particles were rotated with the cylindrical PCVD reactor and they were coated with TiO₂ thin films uniformly by the deposition of thin film precursors in the gas phase. The TiO₂ thin films were coated on the PP particles uniformly and the thickness of thin films almost prop proportional to the deposition time. The TiO₂ thin films grew more quickly on the PP particles with increasing rotation speed of the reactor. This study shows that a rotating cylindrical PCVD reactor can be a good method to coat high-quality TiO₂ thin films uniformly on particles.

Antecedents of Organic Food Products Intention and Behaviors: Evidence from Vietnam

Hung Cuong PHAM 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11

The paper investigates the antecedents of Organic Food (OF) produce in Vietnam and the intentions and behavior of OF purchasers. A theoretical framework is developed and evaluated by simulation of the structural model. Data was collected from a convenient sample of 222 consumers from Ho Chi Minh City in Vietnam. The selection included 159 (72%) women, who were identified as being the primary buyers of organic food for their family (73%). Findings suggest food hygiene issues and conscientious self-identity as the much beneficial determinants of organic production perceptions. Because of the results in this report, the consideration for food security has gained little research consideration throughout the field of organic produce. Food safety concerns are also related to academics exploring consumer confidence as they might be regarded as one of their aspects in selecting standard, natural or health food products. Findings suggest food security as one of the essential determinants of motivation, while health awareness purports to become the least significant motivation, contrary to observations from certain previous studies. However, it is observed that moral personality-identity influences both perceptions and willingness to buy organic food, stressing that the association of participants with ethical concerns influences their perceptions and eventual choices of consumption.

Hydrophobicity and Nanotribological Properties of Silicon Channels coated by Diamond-like Carbon Films

Pham, Duc Cuong,Na, Kyung-Hwan,Pham, Van Hung,Yoon, Eui-Sung Korean Tribology Society 2009 KSTLE International Journal Vol.10 No.1

This paper reports an investigation on nanotribological properties of silicon nanochannels coated by a diamond-like carbon (DLC) film. The nanochannels were fabricated on Si (100) wafers by using photolithography and reactive ion etching (RIE) techniques. The channeled surfaces (Si channels) were then further modified by coating thin DLC film. Water contact angle of the modified and unmodified Si surfaces was examined by an anglemeter using the sessile-drop method. Nanotribological properties, namely friction and adhesion forces, of the Si channels coated with DLC (DLC-coated Si channels) were investigated in comparison with those of the flat Si, DLC-coated flat Si (flat DLC), and Si channels, using an atomic force microscope (AFM). Results showed that the DLC-coated Si channels greatly increased hydrophobicity of silicon surfaces. The DLC coating and Si channels themselves individually reduced adhesion and friction forces of the flat Si. Further, the DLC-coated Si channels exhibited the lowest values of these forces, owing to the combined effect of reduced contact area through the channeling and low surface energy of the DLC. This combined modification could prove a promising method for tribological applications at small scales.

Factors affecting the competitive advantage of supermarkets: Evidence from Vietnam

Cuong Hung Pham 사람과세계경영학회 2019 Global Business and Finance Review Vol.24 No.1

This article focuses on analyzing the factors affecting the competitive advantage of supermarkets. The purpose of the study is to develop a framework for analysis of the factors to likely effect competitive advantage of supermarkets. There are seven factors having a significant effect on the competitive advantage of supermarket. These factors are variety of goods, space of supermarket, price, shop assistants, infrastructure, trust and all the factors combining together. The article uses both qualitative and quantitative methods. Data collected from the in-depth interview of 34 customers in 17 supermarkets in Vietnam were objective and reliability because the researcher interviewed all the 34 customers carefully. 600 questionnaires were delivered. 560 questionnaires were collected. 550 questionnaires were accepted. Questionnaires were analyzed by using SPSS 18.0. The results said that factors affecting the competitive advantage of supermarkets are shop assistant, variety of goods, space of supemarket, and infrastructure.

Factors Affecting Consumer Goods Buyers’ Choice in E-Commerce Sites: Evidence from Vietnam

Hung Cuong PHAM 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11

The main purpose of this study is to find the factors affecting the consumer goods buyers’ choice on e-commerce sites in Vietnam. By using the quantitative method, the paper examines the theoretical research model and tests four hypotheses. The sample was drawn from the population of e-commerce sites in Vietnam comprising about 1,000 respondents. This study used the questionnaire method to collect primary data to test the hypotheses. Data analysis of the questionnaire was done using SPSS. The results show that there is a correlation between personal preferences of consumers on colors and brands and their actual final choice on e-commerce sites in Vietnam. The most important factor affecting the consumer goods buyers’ choice on e-commerce in Vietnam is the brand of E-commerce site, following by the color and position. Among all educational groups, respondents with a Master degree pay the biggest attention to the site’s color attribute, and those with a Bachelor degree pay more attention to the brand attribute. Women pay much more attention to the location of the products on the screen than men, as do consumers with a PhD degree, over respondents with a Bachelor or Master degree, and foreigners over Vietnamese consumers.

Antecedents of Store Management Strategies and Visual Merchandising on the In-Store Engagement of Consumer Good Buyers: An Empirical Study

Pham Hung Cuong 사람과세계경영학회 2019 Global Business and Finance Review Vol.24 No.4

Visual merchandising is a presentation of merchandise as well as the store in order to attract the customer. In addition, it is an eye-catching technique by which the seller can appeal to more customers and convey the message to the customer what the store represents and offers to its potential customers. Currently, retailers are using various merchandising techniques to differentiate themselves from other competitors and to achieve market dominance by attracting the customers more effectively. Thus, the main purpose of this study is to analyze the antecedents of store management strategies and visual merchandising techniques on the in-store engagement of consumer goods buyers. The study was conducted to test how visual merchandising and exterior factors impact the store image and customer buying behavior. It is found that window display, fixture, color, and lightning are significantly associated with consumer buying behavior. Hence, in order to survive in a highly competitive market, it is important for retailers to use creative designs to efficiently present their stores to customers. The sample size of 1200 respondents was collected through primary and secondary data sources and was analyzed to achieve the aims of the study.

Factors Affecting the Market Share of Retailers: Evidence from Vietnam

Hung Cuong PHAM 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11

This research focuses on the analysis of factors affecting the market share of retailers in Vietnam. This research uses Smith and Chaffey’s (2005) 5Ss e-marketing model for analysis, which include Sell, Serve, Speak, Save, and Sizzle. Both quantitative and qualitative methods will be used to conduct the study. The researchers collected information from customers, managers, and directors in 25 retailers in Vietnam. A survey questionnaire was delivered to 15 people in each of the retailers who are customers, managers and directors. The researcher used the SPSS 16.0 software to analyze the data collected and in-depth interviews were carried out with the purpose of testing the hypothesis as well as the overall framework of the research. Out of the 375 questionnaires delivered, 360 were returned. The means of 23 items in the survey questionnaire ranged from 3.3733 to 4.3533 representing the outcome of the descriptive analysis. Research results showed that Cronbach’s Alpha coefficient of five factors affecting the market share of the retailers is sizzle, save, sell, serve and speak. This research has proposed some implications for the market share of retailers, including technology enhancement for full message delivery, ways to approach target customers, and improving product diversity.

Factors Determining Brand Equity for Retail Stores: A Market Segmentation Approach

PHAM, Hung Cuong Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10

The present study aims to analyze factors of brand equity in the retail stores in Vietnam; to recognize sub-dimensions connected with the forms of brand equity and thereby study the extent of the relationship among bases of market segmentation and brand equity. The present research made a collection of data by conducting a preliminary study. Responses were collected from the customers through a structured questionnaire to buy goods and services from the retail store in Vietnam. The sample size selected for the study was 196. The study applied various statistical tools, namely, Cronbach's Alpha for reliability checking, correlation and regression statistics with the support of SPSS Software. The brand association is treated as a vital determinant of brand equity that significantly influences the bases of market segmentation. Further, the study also recognized the fact that the majority of consumers who prefer to buy from retail stores are young and in the age-group of 18-24 years. The present study made an initial attempt to study the relationship among bases of market segmentation with the factors related to brand equity; thereby to offer a novel conceptual framework designed for retail stores in Vietnam for brand positioning.

Superior micro/nano-tribological properties of polymeric channels

Duc-Cuong Pham,R. Arvind Singh,Pham Van Hung,Eui-Sung Yoon 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11

This work investigates micro/nano-scale tribological properties of sub-micrometer channels fabricated on thin polymeric surfaces by a soft lithographic technique. This technique involves placement of an e1astomeric mold onto a spin-coated polymeric film on the silicon substrate, and then the negative replica of the mold is formed by raising the temperature above the glass transition of the polymer. Water contact angle of the channels and the flat film was measured by an anglemeter using the sessile-drop method. Nano-scale adhesion and friction characteristics of the samples were measured by a commercial atomic force microscope (AFM) whereas micro-scale friction was measured by a micro-tribotester. Results show that water contact angle of the polymeric surface increased significantly by the channeling. The nano-scale adhesion and friction of channeled surface as well as its micro-scale friction reduced markedly when compared to those of PMMA thin film. Friction behavior of the channeled surface significantly depended on sliding direction for both micro/nano-scales.