Hendrik Lamsali

The integrated model for solving the single-period deterministic inventory routing problem

This paper discusses the problem of efficiently managing inventory and routing problems in a two-level supply chain system. Vendor Managed Inventory (VMI) policy is an integrating decisions between a supplier and his customers. We assumed that the demand at each customer is stationary and the warehouse is implementing a VMI. The objective of this paper is to minimize the inventory and the transportation costs of the customers for a two-level supply chain. The problem is to determine the delivery quantities, delivery times and routes to the customers for the single-period deterministic inventory routing problem (SP-DIRP) system. As a result, a linear mixed-integer program is developed for the solutions of the SP-DIRP problem.

A mixed integer non-linear programming model for optimizing the collection methods of returned products

This paper studies the problem manufacturers facing to determine the collection methods for used product at the end of its life. Three collection methods that are practically applicable are studied namely pick-up, drop-off and mail return. This paper investigates the problem of assigning collection methods to collect returned products from customer zones that can maximize manufacturers profit. A mixed integer non-linear programming model integrating the three collection methods is proposed to tackle the problem. The model is then tested using some problem instances and the results are promising. The potential and benefits of the proposed model are also highlighted.

The impact of preventive maintenance practices on manufacturing performance: A proposed model for SMEs in Malaysia

Preventive maintenance (PM) plays important role to avoid or mitigate potential stoppages and disruptions of equipment or machinery from occurring in daily operations. PM emphasized total employee involvement and it is important for companies as well as Small and Medium Sized Enterprises (SMEs). SME sectors contribution to the Malaysian economy makes up 95% of the total manufacturers, however PM remain relatively lacking. The ability, reliability and effective maintenance management is highly important in order to achieve desired manufacturing performance. Therefore, organizational capability in planning, controlling, implementing and monitoring PM activities is important. Furthermore, empirical evidence on the potential impact of PM practices towards manufacturing performance with organizational capability as a moderating effect is still limited and indecisive. Henceforth, this paper aims to explore and investigate potential relationships between PM practices and manufacturing performance moderated by or...

A large neighbourhood search to solve capacitated planar location-allocation problem

This paper presents a large neighbourhood search for solving the planar location-allocation problem. This location-allocation problem entails to find the location of specified number of facilities on a plane and their customer allocations on a plane. It is generally assumed that all facilities have the same given capacity. A greedy algorithm is used to generate initial solutions and then an exchange neighbourhood procedure is put forward to explore large neighbourhood heuristically. The experiments are conducted to assess the performance of the proposed method using benchmark data sets taken from the facility location literature. The preliminary computational results show that the proposed methods provide competitive results when compared to the best known results from the literature. Some future research investigations on this capacitated planar location problem are also briefly highlighted.

Linkages between supplier, customer involvement and business performance: A green supply chain investigation in the poultry industry

The aim of this study is to propose an investigation over the potential relationships between supplier and customer involvement towards business performance in poultry production. The potential role of employees skill levels as moderating variable between the aforementioned independent and the dependant variables are discussed. Green supply chain practices and its corresponding performance indicators in the form of poultry waste management are among the important measures in the dependant variable (business performance). Based on the extensive survey of relevant literature, a research framework is then proposed. The inclusion of customer involvement (independent variable), the skill levels (moderating variable) and green supply chain practices (dependent variable) in the proposed framework is the main contribution of this study. It is expected that this study will be beneficial to poultry industry, relevant policy makers and the growing body of knowledge of supply chain investigation in the agribusiness.

Optimizing the selection of product recovery options

This paper investigates the problem of optimizing product recovery options within the reverse logistic context. A linear programming model is developed to find optimal allocation of returned products in different quality classes to certain recovery options. The objective is to maximize the profit. Qualities and quantities of returned products, demands, prices of the recovered products and costs for recovery are all considered in the model. The model is used to examine the effects of flexibility in product recovery allocation. Computation results show that flexible allocation between the returned products in different quality classes and the recovery options are beneficial.