Independent Journal of Management & Production
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Reverse bullwhip effect: duality of a dynamic model of Supply Chain
Get PDFThis study aims to investigate control strategies for the bullwhip effect based on a dynamic model of the linear supply chain, proposed by Helbing and Lammer (2005), which describes the inventory dynamics and production rates of productive units. We simulated the model for instability and stability conditions defined by mathematical analysis. Through these results, we verified both classical and reverse bullwhip effects associated with instability and stability conditions, respectively. The model revealed a duality once the control strategy proposed by Helbing and Lamer (2005) for the classical bullwhip effect ends up causing a reverse effect, which is equally troubling. In the reverse bullwhip effect, we observed amplification of the production rates in the network chains from the supplier to the customer in a way that the upstream chain was not able to meet the needs of the downstream chain. To withhold both effects, we suggest the dynamic control of the parameters that describe the network based on Helbing and Lammer (2005) model
Factors influencing the deployment of innovative (ict) facilities by construction organisations in port Harcourt, Nigeria
Get PDFData management and exchange of information within contractor organization or between contractors and/or consultant or clients are facilitated through effective information and communication technologies (ICTs) facility provisions. Information exchange happens in real time and jobs made easier through the use of electronic devices. In spite of the huge data generation and information exchange needs of construction contractors, they are still faced with the challenge of adopting ICT in their daily transactions. Thus, this research set out to assess the factors influencing innovative ICT facilities deployment in contracting firms in Port Harcourt. The study adopted a survey approach, in which quantitative data were gathered from construction professionals within the study area, using of a well-structured questionnaire. With a response rate of 68.28%, the data gathered were analyzed using percentage and factor analysis. The study reveals that the factors influencing the deployment of ICT in construction are; Change related issues, Security related concerns, Human and management related Concerns, and Cost related Concerns. Key among these factors are satisfaction with existing method of working, inadequate trained ICT professionals, inadequate knowledge about return on ICT investment, virus attack, security breach and fear of piracy, and lack of legal support for use of ICT. It was recommended that government should put legislation in place to make it mandatory for construction firms to make ICT an integral part of their service delivery
Escape rooms in virtual reality, the concept and application in electronic business doing
Get PDFThe world has changed with the help of the Internet; simultaneously, the manner of our business doing has also changed. It has opened a door to new possibilities, business models, and innovative ideas. This electronic revolution has really facilitated communication and trade. The duty on the part of users and followers of technology is to keep advancing and use these means to their own benefit. This paper is aimed at presenting the advantages of using modern technologies, such as virtual reality, in the very business doing of traditional escape rooms
Implications of additive manufacturing on supply chain and logistics
Get PDFAdditive manufacturing (AM) technology has attracted the interest of industrial professionals and researchers in the last years. This interest lies primarily in understanding the trends, benefits, and implications of AM technology on supply chain (SC) and logistics, as it requires reconfiguring the supply chain based on a distributed manufacturing strategy, closer to the consumer market, with shorter lead times and less raw materials. It still is an emerging field, and needs further study. Therefore, a better understanding of main trends will contribute to the dissemination of knowledge about AM technology and its consolidation. This article seeks to investigate the implications of AM, as an advanced manufacturing model, on SC and logistics. A four-step research method was used to develop a systematic literature review and a bibliometric analysis on the AM implications in SC and logistics. The main implications of AM on SC and logistics were classified in seven key issues gathered as result of the literature review. Additionally, bibliometric study allowed understanding researches major trends in this field. The key aspects highlighted and characterized as major implications of AM on SC and logistic are: supply chain complexity reduction; more flexible logistics and inventory management; better spreading and popularization of mass customization; decentralization of manufacturing; greater design freedom and rapid prototyping; increasing of resource efficiency and sustainability, and the need to have clearly defined legal and safety aspects
Economic observatory: proposal of a longitudinal study on the profile of (dis)employment in the Alto Tietê Region
Get PDFRegional economic data provide myriad possibilities for pursuing projects related to economic growth and development. Specifically, the Economic Observatory consists of the process of elaboration, capture, analysis and distribution of information related to the profile of (dis) employment of labor. From these stages, the production of studies in the form of scientific works and media dissemination, will aim to stimulate the approach of research institutions and the market formed by people who exercise physical and legal activities in the development and practices of actions that allow a better elaboration in resource allocation, either part of government or private enterprise. The procedures started consist of a validation process of the data collection instrument by specialists, pretesting and initial analysis of the applied database. This is a quantitative study, whose database will consist of minimum quantities of 100 used. Larger studies consider clustering as multiple minimum quantities into a large database and proceeding as cross-sectional analyzes of the thirty-seven investigated variables. The expected result is the creation and development of several research groups, as well as generating information on the topic for those interested
Feasibility analysis of design for remanufacturing in bearing using hybrid fuzzy-topsis and taguchi optimization
Get PDFThe tremendous advancement in technology, productivity and improved standard of living has come at the cost of environmental deterioration, increased energy and raw material consumption. In this regard, remanufacturing is viable option to reduce energy usage, carbon footprint and raw material usage. In this manuscript, using computational intelligence techniques we try to determine the feasibility of remanufacturing in case of roller bearings. We collected used N308 bearings from 5 different Indian cities. Using Fuzzy-TOPSIS, we found that the roundness, surface roughness and weight play a vital role in design for remanufacturing of roller bearings. Change in diameter, change in thickness and change in width showed minimal influence. We also used Taguchi analysis to reassess the problem. The roundness of inner and outer race was found to be the most influential parameters in deciding the selection of bearing for remanufacturing. The results suggest the bearing designer to design the bearing in such a way that roundness of both races will be taken cared while manufacturing a bearing. However, using Taguchi the weight of the rollers was found to be of least influence. Overall, the predictions of Taguchi analysis were found to be similar to Fuzzy-TOPSIS analysis
On cities and entropy: a thermodynamical view of the large towns
Get PDFPresent article proposes the application of the concept of entropy in the study of the environmental impacts created by a city. It was taken a strictly thermodynamic approach of cities as heat sinks that generate entropy. The formalism of caloric field theory was adopted to establish the relationship between entropy caused by thermal exchanges and the physical environmental parameters considered. The notion of evolutional global time was introduced in order to treat entropy more objectively in the context of thermodynamics. A table with the rates of change of entropy in some cities was set
Critical accommodation information for travel opinion leader
Get PDFPotential tourists search for accommodation information once they decide to travel. Travel opinion leaders are critical accommodation information providers for potential tourists. However, we know little about travel opinion leaders’ perceived importance of accommodation information. The current study examined the relationship between travel opinion leadership and perceived importance of accommodation information. Results showed that there were significant differences in the perception of important accommodation information between the high and low travel opinion leadership groups. These results make theoretical and practical implications for tourism research and accommodation managers