

Articles
by
YungFu Huang 
Total Records (
15 ) for
YungFu Huang 





YungFu Huang
,
KuangHua Hsu
,
PoShun Chen
and
ShihHao Dong


Human resource has become more important in businesses that a lot of supervisors have perceived the establishment of performance evaluation standard. It is a wisdom that the situation has become even more apparently in the case company. From previous valuations, T company still needs improvement on the systems, like human resource in practice. For this reason, the study aims to (1) develop a suitable valuation model for the Occupational Safety Section in T company, select an appropriate human resource valuation index and classify the index with the characters, (2) propose various weights and sequences for T company with Analytic Hierarchy Process (AHP) and (3) apply the model with motivational pattern to promote the work motivations and desires to remain of employees. The findings show (1) to provide the valuation index of the Occupational Safety Section in T company with an appropriate weight, (2) that, with the valuation, the performance evaluation is the product of original performance and performance index, showing that the results are flexible and objective and (3) the model collocating Weighted in Points can provide T company with methods to encourage employees with better performance and increase work incentives. 





YungFu Huang


The present study was carried out to investigate Goyal`s model (1985) and Teng`s model (2002) using the algebraic method to determine the optimal cycle time under delay payments. This paper provides algebraic approach that must be considered as a pedagogical advantage for explaining the inventory concept to students that lack knowledge of derivatives. This algebraic approach could therefore be used easily to introduce the basic inventory theories to younger students who lack the knowledge of calculus. 




YungFu Huang


In 1985, Goyal investigated the inventory problem under permissible delay in
payments independent of the order quantity. In the present study, the restrictive
assumption of the trade credit independent of the order quantity is relaxed.
The present study investigates the retailer`s
inventory problem under permissible delay in payments dependent of the order
quantity within the economic order quantity (EOQ) framework. In addition, we
adopt the algebraic method to determine the retailer`s
optimal ordering policy under minimizing the annual total relevant cost was
adopted. Then, two theorems are developed to efficiently determine the optimal
cycle time and optimal order quantity for the retailer. Finally, numerical examples
are given to illustrate these theorems obtained in the present study. 




YungFu Huang


In present study, the model of Huang has been modified and discussed with retailer`s ordering policy under conditions of cash discount and trade credit. Mathematical model has been modified for obtaining the optimal cycle time and optimal payment policy for item under cash discount and trade credit so that the annual total cost is minimized. Then, a theorem is provided to efficiently determine the optimal cycle time and optimal payment policy. Finally, a numerical example is solved to illustrate the results obtained. 




YungFu Huang


This study investigate the retailer’s optimal cycle time and optimal payment time under supplier’s trade credit policy and cash discount policy. Mathematical models have been derived for obtaining the optimal cycle time and optimal payment policy for item under supplier’s trade credit and cash discount so that the annual total relevant cost is minimized. Furthermore, numerical examples have given to illustrate the results developed in this study and a lot of managerial insights have obtained. 




YungFu Huang
and
YingShiou Lin


This study tries to investigate the retailer`s optimal replenishment policy under permissible delay in payments and cash discount within the EPQ framework. Mathematical models have been derived for obtaining the optimal cycle time for item so that the annual total relevant cost is minimized. Furthermore, numerical examples are given to illustrate the results developed in this study. 




ChungLi Chou
,
YungFu Huang
and
HungFu Huang


The present study investigate the retailer’s optimal cycle time and optimal payment time under supplier credits including conditionally permissible delay in payments and cash discount depending on retailer payment time. That is, the retailer can obtain fully permissible delay in payments and cash discount if the payment is paid before the period of full delay payments permitted by the supplier. Otherwise, the retailer will just obtain partially permissible delay in payments within the period of partial delay payments permitted by the supplier. The supplier uses this policy to attract retailer to pay the payment as soon as possible to shorten its collection period. Mathematical models have been derived for obtaining the optimal cycle time and optimal payment time for item so that the annual total relevant cost is minimized. One theorem is developed to efficiently determine the optimal replenishment and payment policy for the retailer. 




YungFu Huang


In this study the restrictive assumptions of the trade credit independent of the order quantity and the retailer’s unit selling price equaled to the purchasing price per unit are relaxed to fit real business situations. This study investigates the retailer’s inventory problem under trade credit dependent of the order quantity and the retailer’s unit selling price not necessarily equals to the purchasing price per unit within the Economic Order Quantity (EOQ) framework. In addition, we adopt the algebraic procedure to determine the retailer’s optimal ordering policy under minimizing the annual total variable cost. This algebraic approach could therefore be used easily to introduce the basic inventory theories to younger students who lack the knowledge of calculus. Then, two theorems are developed to efficiently determine the optimal cycle time and optimal order quantity for the retailer. Finally, numerical examples are given to illustrate these theorems and obtain a lot of managerial insights. 




YungFu Huang
and
ChihSung Lai


This research tries to deal with the retailer`s lotsizing problem under two warehouses and two levels of delay permitted using algebraic method. In addition, we develop easytouse procedures to find the optimal lotsizing policy for the retailer under minimizing annual total relevant cost. This study provides this algebraic approach that could be used easily to introduce the basic inventory theories to younger students who lack the knowledge of calculus. Furthermore, we develop three easytouse theorems to efficiently determine the optimal cycle time and optimal lot sizing for the retailer. Finally, a numerical example is given to illustrate these theorems obtained in this study. In addition, we obtain a lot of managerial insights from this numerical example. 




YungFu Huang
and
KuangHua Hsu


The purpose of this research is to relax this assumption and establish the retailer’s inventory system as a cost minimization problem to determine the retailer’s optimal inventory cycle time. Then, an algebraic approach is provided and an easytouse theorem is derived to efficiently determine the optimal cycle time. From the final numerical examples, result implies that the retailer will order less quantity to take the benefits of the permissible delay in payments more frequently when the larger the differences between the unit selling price per item and the unit purchasing price per item. 




KuangHua Hsu
,
HungFu Huang
,
YuCheng Tu
and
YungFu Huang


In the previous related studies, the inventory replenishment problems under permissible delay in payments are independent of the order quantity. In this study, the restrictive assumption of the trade credit independent of the order quantity is relaxed. This study discusses the inventory policies under permissible delay in payments when a larger order quantity. 




YuCheng Tu
,
KuangHua Hsu
and
YungFu Huang


In this study, the restrictive assumptions of the trade
credit period independent of the order quantity and the retailer`s unit
selling price equaled to the purchasing price per unit are relaxed to
fit real business situations. In 1985, Goyal considered the retailer`s
inventory replenishment problem under trade credit period independent
of the order quantity and the retailer`s unit selling price and the purchasing
price per unit were equal. This article investigates the retailer`s inventory
problem under trade credit period dependent of the order quantity and
the retailer`s unit selling price not necessarily equals to the purchasing
price per unit within the Economic Order Quantity (EOQ) framework. In
addition, we use an easy and simple arithmeticgeometric mean inequality
approach to determine the retailer`s optimal ordering policy under minimizing
the annual total relevant cost. This approach could therefore be used
easily to introduce the basic inventory theories to younger students who
lack the knowledge of calculus. Finally, numerical examples are given
to illustrate the proposed model and its optimal solution. 




WenKuang Yang
,
HungFu Huang
,
YuCheng Tu
and
YungFu Huang


The main purpose of this study is to investigate the retailer’s inventory policy under twolevel delay permitted to reflect the supply chain management situation. In this study, we assume that the retailer maintains a powerful position. So, it is assumed that the retailer can obtain the full trade credit offered by the supplier yet the retailer just offers the partial trade credit to his customers. Under these conditions, the retailer can obtain the most benefits. Then, an algebraic approach is provided to investigate the retailer’s inventory system as a cost minimization problem to determine the retailer’s optimal inventory policy under the supply chain management. One easetouse theorem is developed to efficiently determine the optimal inventory policy for the retailer. Finally, numerical examples are given to illustrate the theorem. 




YungFu Huang


The present note studied the effect of random defective rate and imperfect rework process on the Economic Production Quantity (EPQ) model. They demonstrate that the optimal lot size can be solved algebraically and the expected inventory cost can be derived immediately as well. In this note, we will offer a simple algebraic approach to replace their algebraic skill to find the optimal solution under the expected annual cost minimized. 




JyhRong Chang
,
YungFu Huang
and
HungFu Huang


This note deals with the optimal lot sizing decision at the technology selection stage, and modifies the optimal solution procedure in constant demand case described in Khouja (Omega 2005, 33, 4753). This note develops an alternative approach to find the optimal lot sizing to improve the study of Khouja (Omega 2005, 33, 4753). Finally, numerical examples are given to illustrate the result discussed in this study. 





