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Hsu J.-T.,Hungkuang University | Hsu L.-F.,City University of New York
International Journal of Production Economics | Year: 2013

Abstract: In practice the items received in a lot may contain defective items, and the screening process to eliminate the defective items may involve both a Type I and a Type II error. Due to the defective items and the inspection errors, shortages may sometimes occur. In this paper, we develop an economic order quantity model with imperfect quality items, inspection errors, shortage backordering, and sales returns. A closed form solution is obtained for the optimal order size, the maximum shortage level, and the optimal order/reorder point. If shortages are not allowed, we adopt the order overlapping scheme proposed by Maddah et al. (2010) (Computers and Industrial Engineering. 58 (4), 691-695.) to develop an EOQ model to prevent shortages during the screening process. Numerical examples show the impacts of the defective probability, the inspection errors, and the holding and backordering costs on the optimal solution. © 2013 Elsevier B.V. All rights reserved.

In wireless environments, data broadcast can offer unlimited mobile users up-to-date and shareable information in the meantime. Traditional schemes favor popular queries and thus sacrifice unpopular queries. This paper considers a broadcast scheduling problem, minimizing the worst access time for both popular and unpopular queries. Five useful heuristics and one anomaly are discovered, by which we can deal with this NP-hard problem properly. In our findings, the problem can be solved optimally if mobile users' access patterns present in some particular forms. Three algorithms are proposed and their near-optimality is shown in the experimental results. © 2012 Elsevier Inc. All rights reserved.

Chou W.-L.,Hungkuang University
Journal of Hazardous Materials | Year: 2010

The study was to investigate the performance of electrocoagulation (EC) for the efficient removal of polyvinyl alcohol (PVA) from aqueous solutions. Several parameters were evaluated to characterize the PVA removal efficiency, such as various electrode pairs, current densities, supporting electrolytes, temperatures, and initial electrolyte concentrations. The effects of the current density, supporting electrolyte, and temperature on the electrical energy consumption were also investigated. The experimental results indicate that a Fe/Al electrode pair is the optimum choice out of four different electrode pair combinations. The optimum current density, supporting electrolyte concentration, and temperature were found to be 5mAcm-2, 0.008N NaCl, and 298K, respectively. The PVA removal efficiency decreased with increasing in the initial concentrations. The kinetic studies indicated that the EC process was best described using pseudo-second-order kinetics. The experimental data were also compared to different adsorption isotherm models in order to describe the EC process. The adsorption of PVA was best fitted by the Langmuir adsorption isotherm model. Thermodynamic parameters such as the Gibbs free energy, enthalpy, and entropy indicated that the adsorption of PVA on metal hydroxides was feasible, spontaneous and endothermic in the temperature range of 288-318K. © 2010 Elsevier B.V.

In this article, I extend Balkhi ((2001), 'On a Finite Horizon Production Lot Size Inventory Model for Deteriorating Items: An Optimal Solution', European Journal of Operational Research, 132, 210-223), by considering a generalised mathematical production-inventory model for deteriorating items with partial backlogging. The demand, production and backlogging rates are assumed to be continuous and varying with time. The objective is to find the optimal production restarting and stopping time to keep the total relevant cost as low as possible. To ascertain the optimal solution exists, the conditions for the total relevant cost in the system which attains its global minimum are provided. In addition, based on the minimum total relevant cost, an alternative among the proposed four cases is also suggested. Finally, a numerical example and sensitivity analysis is illustrated and some management insights are presented. © 2011 Taylor & Francis.

The purpose of this research is to explore people's intention to use telecare and evaluate the degree of influence that behavioral factors on individuals' acceptance of telecare. The subjects are residents of Taiwan. The Structural Equation Modeling (SEM) technique was used to analyze the forecasting model applied to telecare. The results show that this model has good explanatory power for the behavioral intentions of using telecare. Among factors influencing the behavioral intentions of using telecare, the strongest factor is attitude, followed by the perceived usefulness, the perceived ease of use, subjective norms, and personal innovativeness, respectively. The findings of this study may serve as a reference to future studies. © 2013 Elsevier Ltd.

In this study, angiotensin I-converting enzyme (ACE) inhibitory peptides, which had previously been identified in an active gelfiltration fraction from tuna cooking juice, were examined for the stability of their inhibitory properties and composition changes during processing and in the presence of gastrointestinal proteases. Results indicated that ACE inhibitory peptides reserved almost the same composition before and after various temperatures (20-100 °C), levels of pressure (50-300 MPa) and pH (2-10) treatments. ACE inhibitory peptides retained 95-99% activity after simulated digestion. High Performance Liquid Chromatography (HPLC) chromatograph peptide mappings exhibited slight differences before and after temperature (100 °C), pressure (300 MPa) and pH (2, 10) treatments. Our results indicate that tuna cooking juice-derived ACE inhibitory peptides possess some degree resistance to the influence of temperature, pressure, pH treatments, and gastrointestinal proteases. © 2010 Elsevier Ltd. All rights reserved.

Yang H.-L.,Hungkuang University
International Journal of Production Economics | Year: 2012

In many inventory systems, the effects of deterioration of physical goods have drawn much attention of various researchers in recent years. The more the deterioration is, the more the order quantity would be. According to such consideration, taking the deterioration rate into account is necessary. Thus, in this paper, I develop the two-warehouse partial backlogging inventory model introduced in Yang (2006) to incorporate three-parameter Weibull deterioration distribution. The objective is to derive the optimal replenishment policy that minimizes the net present value of total relevant cost per unit time. Two alternative models are compared based on the minimum cost approach. The study shows that the optimal solution not only exists but also is unique. Model 2 is still less expensive to operate than Model 1 in the proposed model. Finally, some numerical examples and sensitivity analysis on parameters are made to validate the results of the proposed inventory system. © 2012 Elsevier B.V. All rights reserved.

Hungkuang University | Date: 2012-02-15

Disclosed is an essential oil composition with anti-free radical ability, which includes dl-Citronellol, Eugenol, cis/trans-Citral, Eugenol Methyl Ether and Thymol. It is confirmed that the essential oil composition of the present invention has superior anti-free radical ability and anti-oxidative ability according to the indices including DPPH free radical scavenging ability, ABTS^(+) free radical scavenging ability, metal ion chelating ability and reducing property, which are extensively used to determine the anti-oxidative ability of a substance.

Hungkuang University | Date: 2015-03-10

In a method for ordering a product, a portable electronic device is configured to: obtain catalog information that includes a plurality of product information entries associated respectively with a plurality of products; display an ordering interface on a display screen of the portable electronic device according to the catalog information; upon receipt an order entry which includes a number of a to-be-purchased one of the products through the ordering interface, generating an electronic order that includes the order entry; and allow a point-of-sale (POS) terminal to obtain the electronic order.

Hungkuang University | Date: 2012-05-18

A biosynthesis method of norephedrine with specific optical activities is revealed to convert and generate optical isomers with specific optical activities by biocatalysis. A two-step biotransformation reaction is carried by a whole-cell biocatalyst for converting reaction substrates, benzaldehyde and pyruvate, to L-phenylacetylcarbinol (L-PAC) in the first step and the yield of the L-PAC is 99%, and then an amino donor (L-alanine) is added and the transamination of the L-PAC is catalyzed by a transaminase with optical specificity for biosynthesizing the norephedrine with high optical purity. The pyruvate is produced from the amino donor, L-alanine, by the transamination in the reaction system, so that the pyruvate is regenerated in the reaction system without being added again.

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