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Optimal Ordering Policy of deteriorating Items with Mixed Cargo Transportation Over a Finite Planning Horizon

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American Journal of Operations Research 2012年第1期2卷 106-121页

作者： Hsi-Mei Hsu Zi-Yin Chen Department of Industrial Engineering & Management National Chaio Tung University Hsinchu Chinese Taipei

In this paper, we propose a deteriorating items inventory model with constant demand and deterioration rates, and mixed cargo transportation modes. The transportation modes are full container load (FCL) and less than container load (LCL). deteriorating items, such as specialty gases which are applied in semiconductor fabrication, deteriorate owing to environmental variation. Exact algorithms are proposed to determine the optimal inventory policies over a finite and an infinite planning horizon. Numerical examples are given to illustrate the proposed solution procedures. In addition, when the deterioration rate is large, the results of the proposed model perform better compared to the inventory model proposed by Rieksts and Ventura (2008).

关键词： Transportation Costs deteriorating Items Inventory Management

An Ordering Policy for deteriorating Items with Time-Dependent Quadratic Demand and Salvage Value under Permissible Delay in Payment

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American Journal of Operations Research 2019年第5期9卷 201-218页

作者： Trailokyanath Singh Madan Mohan Muduly Chittaranjan Mallick Rahul Kumar Gupta Hadibandhu Pattanayak Department of Mathematics C. V. Raman College of Engineering Bhubaneswar India Department of Mathematics CET Techno Campus Bhubaneswar India Department of Mathematics Parala Maharaja Engineering College Berhampur India Department of Mathematics Ravenshaw University Cuttack India

The article deals with an economic order quantity (EOQ) inventory model for deteriorating items in which the supplier provides the purchaser a permissible delay in payment. This is so when deterioration of units in the inventory is subject to constant deterioration rate, demand rate is quadratic function of time and salvage value is associated with the deteriorated units. Shortages in the system are not allowed to occur. A mathematical formulation is developed when the supplier offers a permissible delay period to the customers under two circumstances: 1) when delay period is less than the cycle of time;and 2) when delay period is greater than the cycle of time. The method is suitable for the items like state-of-the-art aircrafts, super computers, laptops, android mobiles, seasonal items and machines and their spare parts. A solution procedure algorithm is given for finding the optimal order quantity which minimizes the total cost of an inventory system. The article includes numerical examples to support the effectiveness of the developed model. Finally, sensitivity analysis on some parameters on optimal solution is provided.

关键词： Constant Deterioration Rate deteriorating Items Economic Order Quantity Permissible Delay in Payment Salvage Value Time-Dependent Quadratic Demand Rate

Navigating the Storm of deteriorating Patients: Seven Scaffolds for Simulation Design

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Open Journal of Nursing 2017年第6期7卷 683-697页

作者： Gwen D. Erlam Liz Smythe Valerie A. Wright-St Clair Department of Nursing Auckland University of Technology (AUT) Auckland New Zealand

Recent trends in simulation use have necessitated a more considered approach in the use of this teaching/learning tool. The aim of this research is to discover ways to improve simulation as a teaching/learning platform. Action research was used to answer the question, “How can I improve pedagogical practices with undergraduate nurses in simulation?” This study was implemented at a University in Auckland, New Zealand between November 2012 and March 2014. A purposive sample was sought from second and third-year nursing students (n = 161) enrolled in the three-year undergraduate bachelor of nursing program. Methods included focus groups, questionnaires, debriefing sessions, pre- and post-tests, and Lasater clinical judgment rubric analysis. Seven instructional scaffolds emerged which maximized student learning and retention. These scaffolds: 1) helped move students from known into unknown knowledge;2) provided situated coaching;3) modeled expected performance;4) gave opportunity for improvement;5) reduced confusion;6) taught effective communication;and 7) promoted new learning through debriefing. These strategies resulted in a simulation experience which improved clinical reasoning in undergraduate nursing students.

关键词： Simulation Undergraduate Nursing Education Scaffold deteriorating Patient

Comparison study of two criteria for identification of structural dynamic stability

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Science China(Technological Sciences) 2019年第5期62卷 856-867页

作者： ZHOU Hao LI Jie School of Civil Engineering Tongji University State Key Laboratory of Disaster Reduction in Civil Engineering

Dynamic stability analyses of structures are becoming increasing prevalent in applications for tall buildings and space structure designs. This paper presents an effective energy criterion for identifying the dynamic stability of generalized structures through the modification of an earlier developed energy criterion for hardening structures. Two time-varying effective energy indices are introduced to account for the dynamic stability of both the hardening and deteriorating structures; one for the description of structural properties, i.e., the structural effective intrinsic energy, and the other for the measurement of the input energy, i.e., the valid external work. It is shown that a structure's stability can survive provided the effective intrinsic energy is always less than the valid external work during a dynamic excitation. The first passage of the effective intrinsic energy over the valid external work indicates the dynamic instability of the structure. A comparison study is carried out regarding the validity and applicability between the energy and effective energy criteria as applied to the dynamic stability analysis of three different structures.

关键词： identification criterion dynamic stability effective intrinsic energy valid external work deteriorating structure

Analysis of an Inventory System for Items with Stochastic Demand and Time Dependent Three-Parameter Weibull Deterioration Function

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Applied Mathematics 2019年第9期10卷 728-742页

作者： Nwoba Pius Ophokenshi Chukwu Walford Ikechukwu Emmanuel Maliki Olaniyi Sadik Department of Industrial Mathematics and Applied Statistics Ebonyi State University Abakaliki Nigeria Department of Statistics University of Nigeria Nsuka Nigeria Department of Mathematics Michael Okpara University of Agriculture Umudike Nigeria

In recent times, mathematical models have been developed to describe various scenarios obtainable in the management of inventories. These models usually have as objective the minimizing of inventory costs. In this research work we propose a mathematical model of an inventory system with time-dependent three-parameter Weibull deterioration and a stochastic type demand in the form of a negative exponential distribution. Explicit expressions for the optimal values of the decision variables are obtained. Numerical examples are provided to illustrate the theoretical development.

关键词： Inventory Model deteriorating Items Weibull Distribution Stochastic Demand MathCAD14