scholarly journals ON INFLUENCE OF SUPPLY FIRM’S MARKET POLICY ON OPTIMIZATION OF ITS ORDERING POLICY WITHIN SUPPLY CHAIN

2020 ◽  
Vol 288 (6) ◽  
pp. 130-133
Author(s):  
O. KLEPIKOVA ◽  
Keyword(s):  
Inventory Management ◽  
Queuing Theory ◽  
Raw Materials ◽  
Optimal Schedule ◽  
Planning Horizon ◽  
Theory And Practice ◽  
Inventory Theory ◽  
Efficient Operation ◽  
Financial Flows ◽  
Optimal Value

As is known, the problem of determining economically justified volumes of supplies in the theory and practice of logistics management plays a key role in ensuring the efficient operation of both individual enterprises and supply chains. Logistics, which is the science of effective management of material, information and financial flows in the field of production and circulation, is closely related to such sections of operations research as mathematical programming, inventory management theory, schedule theory, queuing theory and more. Many tasks of logistics are directly related to the optimal management of stocks of raw materials, semi-finished and finished products, as well as the construction of an optimal schedule for delivery of finished products to points of consumption with the participation of trunk transport. Thus, since the issues of optimal inventory management are of paramount importance in logistics, it means the importance of inventory theory in the design and operation of various logistics systems. The article is devoted to substantiation of expediency and efficiency of additional costs of a supply firm for advertisement with the aim to its profit increasing on the fixed planning horizon under supposition that the expected demand at point of destination may be controlled by firm. For this problem solving the modification of classical Wilson’s model from inventory control theory is used to maximize the total profit of firm for sailing the good, taking into account ordering, delivery and storage of good costs on the planning horizon and additional cost for advertisement of good. It is assumed that buying/sailing prices of good are known, as well as daily expenses for storage of good at warehouse. It is supposed also that demand for the good is an increasing function of advertisement costs. The case of linear dependence of demand on advertisement cost is studied in details. For this particular case the optimal value of ordering party of good and optimal value of cost for advertisement are found in evident form. It is shown also that above optimization model may be generalized for the case of several kinds of good. Restrictions on the capacity of the warehouse for storage of goods and restrictions on the financial resources available to the company allocated for advertising activities are taken into account. A convex optimization problem is obtained, which can be solved numerically using the Excel application package.

scholarly journals Modeling the Supply Process Using the Application of Selected Methods of Operational Analysis

2017 ◽  
Vol 7 (1) ◽  
pp. 50-54 ◽  
Author(s):  
Mária Chovancová ◽  
Vladimír Klapita
Keyword(s):  
Inventory Management ◽  
Economic Efficiency ◽  
Raw Materials ◽  
Service Level ◽  
Effective Management ◽  
Operational Analysis ◽  
Intermediate Products ◽  
The Subject

AbstractSupply process is one of the most important enterprise activities. All raw materials, intermediate products and products, which are moved within enterprise, are the subject of inventory management and by their effective management significant improvement of enterprise position on the market can be achieved. For that reason, the inventory needs to be managed, monitored, evaluated and affected. The paper deals with utilizing the methods of the operational analysis in the field of inventory management in terms of achieving the economic efficiency and ensuring the particular customer’s service level as well.

scholarly journals A literature review on multi-echelon inventory management: the case of pharmaceutical supply chain

2018 ◽  
Vol 200 ◽  
pp. 00013 ◽  
Author(s):  
Nouçaiba Sbai ◽  
Abdelaziz Berrado
Keyword(s):  
Supply Chain ◽  
Customer Service ◽  
Inventory Management ◽  
Raw Materials ◽  
Integrated Approach ◽  
Service Level ◽  
Pharmaceutical Products ◽  
Management Problem ◽  
Pharmaceutical Supply Chain ◽  
Customer Service Level

Inventory management remains a key challenge in supply chain management. Many companies recognize the benefits of a good inventory management system. An effective inventory management helps reaching a high customer service level while dealing with demand variability. In a complex supply chain network where inventories are found across the entire system as raw materials or finished products, the need for an integrated approach for managing inventory had become crucial. Modelling the system as a multi-echelon inventory system allows to consider all the factors related to inventory optimization. On the other hand, the high criticality of the pharmaceutical products makes the need for a sophisticated supply chain inventory management essential. The implementation of the multi-echelon inventory management in such supply chains helps keeping the stock of pharmaceutical products available at the different installations. This paper provides an insight into the multi-echelon inventory management problem, especially in the pharmaceutical supply chain. A classification of several multi-echelon inventory systems according to a set of criteria is provided. A synthesis of multiple multi-echelon pharmaceutical supply chain problems is elaborated.

Improving the Sustainability and Effectiveness of the Inventory Management in Manufacturing Company

2014 ◽  
Vol 693 ◽  
pp. 141-146
Author(s):  
Jan Prachař ◽  
Helena Fidlerová ◽  
Peter Sakál ◽  
Tatiana Zbojová
Keyword(s):  
Sustainable Development ◽  
Inventory Management ◽  
Integrated Management ◽  
Theory And Practice ◽  
Study Program ◽  
Industrial Management ◽  
Business Units ◽  
The Subject ◽  
Kanban System ◽  
Corporate Social

The aim of the project was to optimize the company's inventory management and to suggest measures to minimize inventory and costs and maximize production in an effective and sustainable way. The effectiveness and sustainability of the logistics processes was focused on streamlining of inventory management through the actualization and improvement of existing system Kanban. In the context of sustainable development we propose the Kanban method because its principles are to eliminate waste and to ensure employees satisfied. In the centre of attention is the employee and the company should care for its satisfaction by means of enhancement of workplaces. The objective of this paper is to present characteristics of the Kanban method in theory and practice; it addresses actualization and improvement of the Kanban system and recommendations for future sustainable Kanban system. The work is a part of KEGA project No. 037STU-4/2012 -Implementation of the subject “Sustainable Corporate SocialEntrepreneurship” into the study program Industrial management in the second degree at the MTF STU Trnava.and submitted project VEGA No.č.1/0510/15Sustainable strategic management vs. sustainable corporate social responsibility vs. integrated managementsystem of strategic business units.

scholarly journals Improving the efficiency of leaching of metals from ore raw materials

2018 ◽  
pp. 45-57
Author(s):  
V.I. Lyashenko ◽  
F.F. Topolnyi ◽  
G.D. Kovalenko
Keyword(s):  
Underground Mining ◽  
Raw Materials ◽  
Residential Buildings ◽  
Practical Experience ◽  
Environmental Safety ◽  
Theory And Practice ◽  
Raw Material ◽  
Material Base ◽  
Seismic Safety ◽  
Industrial Buildings

Purpose. Improving the efficiency of leaching of metals from ore raw materials by justifying the parameters of underground mining and the introduction of integrated technology in combination with geotechnology, ensuring the rational use, protection of the subsurface and the environment during the development of reserves by combined geotechnological methods. Metology. The methods of generalization, analysis and evaluation of practical experience and scientific achievements in the field of geotechnology, theory and practice of explosive destruction of solid media, continuum mechanics, mathematical statistics, as well as research techniques of wave processes according to standard and new techniques of the leading experts of the world's advanced mining countries are described. Findings. The factors determining the leaching efficiency of metal ores, environmental and seismic safety are established and the parameters of the explosion are justified taking into account the size of an average linear piece of exploded ore mass, the area of an emanating surface and the seismic safety of protected objects (industrial buildings, residential buildings, the Ingul river underflow, Kropivnitsky, etc.). Originality. Recommended empirical dependence for the prediction of the oscillation speed on the reduced mass of charge per deceleration step in the explosive preparation of ore for underground leaching of metals for the field conditions of the form y = a ∙ b also the value of the permissible displacement rate of the soil at the base of the protected objects = 0.4 cm / s. Practical value. When non-conforming ores of deposits are involved in the production, their raw material base at operating mines can be increased 1.4–1.6 times. Keywords: mining technology, underground mining, metal leaching, environmental safety, efficiency.

scholarly journals PERENCANAAN DAN PENGENDALIAN PERSEDIAAN BAHAN BAKU PAIL CAT MENGGUNAKAN METODE MATERIAL REQUIRMENT PLANNING (MRP) PADA PT. XYZ

JUMINTEN ◽  
2020 ◽  
Vol 1 (4) ◽  
pp. 163-172
Author(s):  
Vify Elviana ◽  
Akmal Suryadi
Keyword(s):  
Inventory Management ◽  
Consumer Demand ◽  
Raw Materials ◽  
Raw Material ◽  
Economic Order Quantity ◽  
Economic Order ◽  
Order Quantity ◽  
Material Requirements Planning ◽  
Total Cost ◽  
Material Requirements

Persediaan merupakan aset perusahaan yang memiliki peran penting dalam operasi bisnis, sehingga perusahaan penting untuk melakukan manajemen persediaan yang baik, artinya perusahaan harus mampu mengantisipasi kendala maupun tantangan yang ada dalam pengelolahan persediaan untuk meminimalisasi total biaya yang harus dikeluarkan oleh perusahaan. Permasalahan yang timbul pada persediaan bahan baku di PT XYZ adalah perusahaan melakukan perencanaan dan pengendalian bahan baku hanya berdasarkan pada pengalaman-pengalaman sebelumnya dan tidak berdasarkan pada metode yang sudah baku. Oleh karena itu pembelian bahan baku tidak sesuai dengan permintaan konsumen. Hal tersebut sering menyebabkan terjadinya kelebihan maupun kekurangan stok bahan baku. Kesalahan dalam penentuan besarnya investasi dalam persediaan akan mengurangi keuntungan perusahaan. Adanya persediaan bahan baku yang terlalu besar, akan menambah beban biaya pemeliharaan dan penyimpanan dalam gudang, serta kemungkinan terjadinya penurunan kualitas bahan baku yang dapat menyebabkan berkurangnya keuntungan perusahaan. Namun jika persediaan bahan baku terlalu sedikit maka akan berakibat pada terhambatnya proses produksi, sehingga tidak terpenuhinya permintaan konsumen. Hasil penelitian ini dapat menyimpulkan bahwa perencanaan kebutuhan bahan baku dengan metode perusahaan didapatkan total cost sebesar Rp 1.796.762.429,-, sedangkan metode Material Requirements Planning (MRP) didapatkan total cost sebesar Rp 1.576.011.801,-. Maka dapat disimpulkan telah terjadi penurunan total cost seluruh bahan baku sebesar 12,28%. Hal ini membuktikan bahwa metode Material Requirements Planning (MRP) lebih efisien daripada metode PT. XYZ. Oleh karena itu untuk mendapatkan total cost yang minimum, metode Material Requirements Planning (MRP) diterapkan pada periode Februari-Juni 2020 sehingga didapatkan total cost sebesar Rp 1.576.011.801,-. Kata Kunci:         Material Requirements Planning (MRP), PT XYZ, Pail Cat, Economic Order Quantity (EOQ), Period Order Quantity (POQ), Lot For Lot (LFL). ABSTRACT                     Inventory is a company asset that has an important role in business operations, so the company is important to conduct good inventory management, meaning that the company must be able to anticipate obstacles and challenges that exist in managing inventory to minimize the total cost to be incurred by the company.The problem that arises in the supply of raw materials in PT XYZ is that the company plans and controls raw materials based only on previous experiences and not based on established methods. Therefore, the purchase of raw materials is not in accordance with consumer demand. This often leads to excess or shortage of raw material stock. Mistakes in determining the amount of investment in inventories will reduce company profits. The availability of raw materials that are too large, will add to the burden of maintenance and storage costs in the warehouse, as well as the possibility of a decline in the quality of raw materials that can lead to reduced company profits. However, if the supply of raw materials is too little, it will result in obstruction of the production process, so that consumer demand is not fulfilled. The results of this study can conclude that the planning of raw material needs by the company method obtained a total cost of Rp 1,796,762,429, - while the Material Requirements Planning (MRP) method obtained a total cost of Rp 1,576,011,801, -. Then it can be concluded that there has been a decrease in the total cost of all raw materials by 12.28%. This proves that the Material Requirements Planning (MRP) method is more efficient than the PT. XYZ. Therefore, to get the minimum total cost, the Material Requirements Planning (MRP) method was applied in the February-June 2020 period so that a total cost of Rp 1,576,011,801 was obtained.   KeyWords: Material Requirements Planning (MRP), PT XYZ, Pail Cat, Economic Order Quantity (EOQ), Period Order Quantity (POQ), Lot for Lot (LFL).

Theoretical Analysis on Powers-of-Two Applied to JSP

2011 ◽  
Vol 2 (2) ◽  
pp. 1-20
Author(s):  
V. Mahesh ◽  
L. Siva Rama Krishna ◽  
Sandeep Dulluri ◽  
C. S. P. Rao
Keyword(s):  
Job Shop ◽  
Job Shop Scheduling ◽  
Optimal Schedule ◽  
Optimal Solution ◽  
Mathematical Induction ◽  
Release Dates ◽  
Scheduling Problems ◽  
Job Shop Scheduling Problem ◽  
Shop Scheduling ◽  
Optimal Value

This paper discusses the scheduling of precedence-related jobs non-preemptively in a job shop environment with an objective of minimizing the makespan. Due to the NP-hard nature of the scheduling problems, it is usually difficult to find an exact optimal schedule and hence one should rely on finding a near to optimal solution. This paper proposes a computationally effective powers-of-two heuristic for solving job shop scheduling problem. The authors prove that the makespan obtained through powers-of-two release dates lies within 6% of the optimal value. The authors also prove the efficacy of powers-of-two approach through mathematical induction.

scholarly journals Production, Replenishment and Inventory Policies for Perishable Products in a Two-Echelon Distribution Network

2020 ◽  
Vol 12 (11) ◽  
pp. 4735
Author(s):  
Mingyuan Wei ◽  
Hao Guan ◽  
Yunhan Liu ◽  
Benhe Gao ◽  
Canrong Zhang
Keyword(s):  
Inventory Management ◽  
Valid Inequalities ◽  
Distribution Network ◽  
Planning Horizon ◽  
Branch And Cut ◽  
Computational Time ◽  
Perishable Products ◽  
Inventory Cost ◽  
Routing Problem ◽  
Selection Of

The research on production, delivery and inventory strategies for perishable products in a two-echelon distribution network integrates the production routing problem (PRP) and two-echelon vehicle routing problem (2E-VRP), which mainly considers the inventory and delivery sustainability of perishable products. The problem investigated in this study is an extension of the basic problems, and it simultaneously optimizes production, replenishment, inventory, and routing decisions for perishable products that will deteriorate over the planning horizon. Additionally, the lead time has been considered in the replenishment echelon, and the unit inventory cost varying with the inventory time is considered in the inventory management. Based on a newly designed model, different inventory strategies are discussed in this study: old first (OF) and fresh first (FF) strategies both for the first echelon and second echelon, for which four propositions to model them are proposed. Then, four valid inequalities, including logical inequalities, a ( ℓ , S , W W ) inequality, and a replenishment-related inequality, are proposed to construct a branch-and-cut algorithm. The computational experiments are conducted to test the efficiency of valid inequalities, branch-and-cut, and policies. Experimental results show that the valid inequalities can effectively increase the relaxed lower bound by 4.80% on average and the branch-and-cut algorithm can significantly reduce the computational time by 58.18% on average when compared to CPLEX in small and medium-sized cases. For the selection of strategy combinations, OF–FF is suggested to be used in priority.

Bounds and good policies in stationary finite–stage Markovian decision problems

1980 ◽  
Vol 12 (1) ◽  
pp. 154-173 ◽  
Author(s):  
Gerhard Hübner
Keyword(s):  
Decision Model ◽  
Transition Probabilities ◽  
Planning Horizon ◽  
Decision Problems ◽  
Optimal Decisions ◽  
Optimal Value ◽  
Action Spaces ◽  
Stationary Problems ◽  
Markovian Decision Problems

A stationary Markovian decision model is considered with general state and action spaces where the transition probabilities are weakened to be bounded transition measures (this is useful for many applications). New and improved bounds are given for the optimal value of stationary problems with a large planning horizon if either only a few steps of iteration are carried out or, in addition, a solution of the infinite-stage problem is known. Similar estimates are obtained for the quality of policies which are composed of nearly optimal decisions from the first few steps or from the infinite-stage solution.

Global Citizenship

2020 ◽  
Author(s):  
April R. Biccum
Keyword(s):  
Educational Reform ◽  
Political Theory ◽  
Global Education ◽  
Global Citizenship ◽  
Theory And Practice ◽  
Diverse Range ◽  
Financial Flows ◽  
The Public ◽  
Global Democracy ◽  
Wide Range

The concept of “Global Citizenship” is enjoying increased currency in the public and academic domains. Conventionally associated with cosmopolitan political theory, it has moved into the public domain, marshaled by elite actors, international institutions, policy makers, nongovernmental organizations, and ordinary people. At the same time, scholarship on Global Citizenship has increased in volume in several domains (International Law, Political Theory, Citizenship Studies, Education, and Global Business), with the most substantial growth areas in Education and Political Science, specifically in International Relations and Political Theory. The public use of the concept is significant in light of what many scholars regard as a breakdown and reconfiguration of national citizenship in both theory and practice. The rise in its use is indicative of a more general change in the discourse on citizenship. It has become commonplace to offer globalization as a cause for these changes, citing increases in regular and irregular migration, economic and political dispossession owing to insertion in the global economy, the ceding of sovereignty to global governance, the pressure on policy caused by financial flows, and cross-border information-sharing and political mobilization made possible by information communications technologies (ICTs), insecurities caused by environmental degradation, political fragmentation, and inequality as key drivers of change. Global Citizenship is thus one among a string of adjectives attempting to characterize and conceptualize a transformative connection between globalization, political subjectivity, and affiliation. It is endorsed by elite global actors and the subject of an educational reform movement. Some scholarship observes empirical evidence of Global Citizenship, understood as active, socially and globally responsible political participation which contributes to global democracy, within global institutions, elites, and the marginalized themselves. Arguments for or against a cosmopolitan sensibility in political theory have been superseded by both the technological capability to make global personal legal recognition a possibility, and by the widespread endorsement of Global Citizenship among the Global Education Policy regime. In educational scholarship Global Citizenship is regarded as a form of contemporary political being that needs to be socially engineered to facilitate the spread of global democracy or the emergence of new political arrangements. Its increasing currency among a diverse range of actors has prompted a variety of attempts either to codify or to study the variety of usages in situ. As such the use of Global Citizenship speaks to a central methodological problem in the social sciences: how to fix key conceptual variables when the same concepts are a key aspect of the behavior of the actors being studied? As a concept, Global Citizenship is also intimately associated with other concepts and theoretical traditions, and is among the variety of terms used in recent years to try to reconceptualize changes it the international system. Theoretically it has complex connections to cosmopolitanism, liberalism, and republicanism; empirically it is the object of descriptive and normative scholarship. In the latter domain, two central cleavages repeat: the first is between those who see Global Citizenship as the redress for global injustices and the extension of global democracy, and those who see it as irredeemably capitalist and imperial; the second is between those who see evidence for Global Citizenship in the actions and behavior of a wide range of actors, and those who seek to socially engineer Global Citizenship through educational reform.

Design and Development of an e-Platform for Supporting Liquid Food Supply Chain Monitoring and Traceability

2010 ◽  
Vol 3 (3) ◽  
pp. 29-49 ◽  
Author(s):  
Dimitris Folinas ◽  
Ioannis Manikas
Keyword(s):  
Supply Chain ◽  
Reference Model ◽  
Raw Materials ◽  
Real Life ◽  
Liquid Food ◽  
Efficient Operation ◽  
Traceability System ◽  
Proposed Model ◽  
Production And Distribution ◽  
Liquid Products

In this paper, the deliverables of a research project are presented, which aims at the development of a webbased platform capable of supporting the traceability of liquid products like milk, wine and olive oil. First, it includes the design of a supply chain reference model and the identification of the data required for the efficient operation of the traceability system. The main elements of the proposed model defined in this paper are the entities, stages, events, and processes. The reference model consists of three distinct phases that represent stages of real-life supply chains. Each of these phases is defined by certain interactions between the above basic elements. Additionally, the proposed e-platform is based on the above reference model aiming to follow and register the production and distribution processes of the raw materials, semi-finals, and final products that are used in the examined industry.

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