32 results on '"Ziaul Huq"'
Search Results
2. A Process Oriented Manufacturing System Simulation to Measure the Effect of Shop Control Factors.
- Author
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Ziaul Huq
- Published
- 1994
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3. Prediction of the near wall flow behaviours of separation and transition for NREL phase VI wind turbine blade
- Author
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Kyoungsoo Lee, Ziaul Huque, Chao Sui, and Raghava Kommalapati
- Subjects
cfd ,sst gamma theta ,blending function ,separation ,intermittency ,transition onset reynolds number ,Renewable energy sources ,TJ807-830 - Abstract
This study demonstrates the separation and transition flow behaviour around a 3-D wind turbine blade by analysing blending functions, intermittency, and transition onset Reynolds number in SST Gamma Theta model. The National Renewable Energy Laboratory Phase VI rotor was modelled for the analysis. The simulations were executed by using the ANSYS-CFX solver. Extensive comparisons were performed to demonstrate the accuracy of this numerical model for sectional pressure distribution, tangent force, normal force, thrust, and torque. Good agreement was observed in all wind speed cases. The discrepancies in pre-stall region were negligible, and those in the post-stall region were acceptable. Thus, the capability and accuracy of the SST Gamma Theta model in predicting separated and transitional flow effects were verified.
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- 2023
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4. A heuristic search routine for solving two objective mixed integer LP problems for scheduling in a service factory
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M. Khurrum S. Bhutta, Faizul Huq, and Ziaul Huq
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Makespan minimisation ,Development environment ,Binary integer linear programming ,Workstation ,Job shop scheduling ,Operations research ,law ,Computer science ,Workload ,Factory environment ,Management Science and Operations Research ,law.invention ,Scheduling (computing) - Abstract
This paper presents a two-objective mixed binary integer linear programming model and a search routine solution method is proposed using a service factory environment with multi-processor workstations and a constant daily workload, for employee scheduling, number of machines per station, and makespan minimisation objectives. The search routine is simple enough to be implemented by managers using readily available spreadsheet programs. Solution of the four-station service factory formulation yielded results for improvement in the makespan of the shop. This search routine can be used by management in streamlining and optimising the service factory production environment as exemplified in the four-station case, and could also be applied to multi-processor flow shops.
- Published
- 2019
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5. Fluid–Structure Interaction Simulations of Wind Turbine Blades with Pointed Tips
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Ziaul Huque, Fadoua Zemmouri, Haidong Lu, and Raghava Rao Kommalapati
- Subjects
fluid–structure interactions ,wind turbines ,tip shape modification ,Technology - Abstract
The aerodynamic shapes of the blades are of great importance in wind turbine design to achieve better overall turbine performance. Fluid–structure interaction (FSI) analyses are normally carried out to take into consideration the effects due to the loads between the air flow and the turbine structures. A structural integrity check can then be performed, and the structural/material design can be optimized accordingly. In this study, three different tip shapes are investigated based on the original blade of the test wind turbine (Phase VI) from the National Renewable Energy Laboratory (NREL). A one-way coupled simulation of FSI is conducted, and results with a focus on stresses and deformations along the span of the blade are investigated. The results show that tip modifications of the blade have the potential to effectively increase the power generation of wind turbines while ensuring adequate structural strength. Furthermore, instead of using more complicated but computationally expensive techniques, this study demonstrates an effective approach to making quality observations of this highly nonlinear phenomenon for wind turbine blade design.
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- 2024
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6. The influence of work‐cells and facility layout on the manufacturing efficiency
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Seyed‐Mahmoud Aghazadeh, Ziaul Huq, Saeedreza Hafeznezami, and Lotfollah Najjar
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Facility layout ,business.industry ,Computer science ,Page layout ,Strategy and Management ,Quarter (United States coin) ,computer.software_genre ,Industrial engineering ,Unit (housing) ,Work (electrical) ,Order (business) ,Management of Technology and Innovation ,Manufacturing ,Operations management ,Business and International Management ,business ,Manufacturing efficiency ,computer - Abstract
PurposeThe purpose of this paper is to analyse the use of a product‐oriented layout and a work‐cell strategy in order to maximise efficiency. These two categories of layout strategies are discussed separately, and are then used collectively in an analysis of the company. The aim is to understand how improvements on layout design could positively impact the future efficiency of the case study company.Design/methodology/approachA model was developed and measured using 26 weeks of data between the fourth quarter of 2009 and the first quarter of 2010 during layout transformations at the case study company based in upstate New York. The model compared variables such as the distance traveled to retrieve parts, average daily output of engines, labour cost per unit produced, and the amount of time the engine remains in each cell; the aim of which is to increase the efficiency of the facility.FindingsThe findings indicate that there is a strong correlation between the variables improved at both the cell‐structures and the product‐structures of the facility and the overall efficiency of the manufacturing facility itself. The results also show that an overall higher efficiency allows for the facility to handle much larger workloads and also drives down both short‐run and long‐run costs. The outcomes also allow for a suggestive redesign of the facility in order to further maximise efficiency. However, it was found that the amount of time a product remains in each cell on the assembly line does not have an effect on the overall output of diesel engines.Research limitations/implicationsVarious studies have been conducted focusing on the “facility layout problem,” yet thorough analyses of the redesigning of layout in regards to efficiency are not as available. Instead, an understanding of the topic was derived through sources focusing on the specificities of manufacturing layout.Originality/valueThis paper describes layout efficiency through redesigns and layout using work‐cells in a product‐oriented environment. This study would be useful to manufacturers having low variability in their product and having the ability to use work‐cell layout within their facility.
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- 2011
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7. Perceptions about benchmarking best practices among French managers: an exploratory survey
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Marie‐Helene Abbo, Ziaul Huq, and Faizul Huq
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Exploratory survey ,business.industry ,Process (engineering) ,Strategy and Management ,Perception ,media_common.quotation_subject ,Best practice ,Survey result ,Benchmarking ,Business and International Management ,Public relations ,business ,media_common - Abstract
PurposeThe purpose of this study is to present a discussion on the most commonly accepted benchmarking norms in the USA, the lessons learned from benchmarking experiences and see how they are translated to benchmarking projects by French managers.Design/methodology/approachA survey questionnaire is developed, based on the ten‐step Xerox benchmarking process, to identify the perceived and/or experienced benchmarking best practices amongst French managers. Large, medium and small companies are surveyed and managers who have participated in or are in the middle of a benchmarking project contributed to the information in developing the conclusions about the perceived best practices, steps and pitfalls for a benchmarking project in French companies.FindingsThe survey result showed uniformity amongst French managers from large companies and their opinion on what is important in bringing a benchmarking project to a successful conclusion. There was however lack of uniformity of opinion when it came to what is important in the benchmarking process amongst French managers from companies of different size.Research limitations/implicationsCaution should be exercised when interpreting these findings since the paper only used data from an exploratory survey of French managers from companies of varying sizes. The limitation of the study is that the conclusions are applicable to French managers only. In order to compare them one would need survey data, using the same questionnaire from managers in other countries.Practical implicationsIndeed, the authors' findings provide a persuasive argument for what French managers consider important in a benchmarking project. It provides valuable insights into the lessons learned from the years of benchmarking experiences and how these experiences have been translated across cultures.Originality/valueBased on the French experience with the benchmarking process, the critical success factors for benchmarking were identified. Importance of each step in the benchmarking process varies amongst companies, critical issues are company and industry specific. In order to compete successfully in today's global marketplace, the French managers recognize the importance of benchmarking, although their perceptions of the important steps in the process vary depending on company size.
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- 2008
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8. Realigning Top Management's Strategic Change Actions for ERP Implementation: How Specializing on Just Cultural and Environmental Contextual Factors Could Improve Success
- Author
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Thomas N. Martin and Ziaul Huq
- Subjects
Organizational Behavior and Human Resource Management ,Process management ,Strategic change ,Work (electrical) ,business.industry ,Strategy and Management ,Organizational change ,Top management ,Operations management ,Business ,Enterprise resource planning ,Acceptance and commitment therapy ,Task (project management) - Abstract
Abstarct An enterprise resource planning (ERP) system and its implementation represents a substantial organizational change. Top management involvement has been cited as a critical factor in the success, as well as, failure of ERP implementation. To increase ERP implementation success, we propose that top management redesign its ERP implementation work to strategically concentrate on managing employee behavioural change to increase employee acceptance and commitment to the ERP project by specializing its involvement on just two factors – cultural and environmental contextual factors. Three case studies are used to validate this proposition. Eight strategic task, responsibility, and relationship changes to be used by top management to increase ERP implementation success are highlighted in the paper.
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- 2007
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9. Six-Sigma implementation through Competency Based Perspective (CBP)
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Ziaul Huq
- Subjects
Organizational Behavior and Human Resource Management ,Total quality management ,Process management ,Computer science ,Strategy and Management ,Process capability ,media_common.quotation_subject ,Six Sigma ,Statistical process control ,Popularity ,Data-driven ,Operations management ,Quality (business) ,Quality function deployment ,media_common - Abstract
The popularity of six-sigma has given rise to the question: can any company adopt this rigid data driven approach to achieve higher levels of quality? This research suggests that a company must develop a unique combination of resources and competencies to realize the benefits of six-sigma. According to the competency based perspective (CBP), a company first needs to have the assets, skills, and resources to launch the six-sigma program, and second, it needs to have the expertise to integrate these assets to orchestrate a cohesive implementation of this program. The paper makes the case that most successful six-sigma adopters had initially implemented Total Quality Management (TQM), Baldridge, or some other quality initiative, preparing them to launch this data driven, process oriented approach. For companies that have emphasized quality function deployment (QFD), innovation and problem solving, statistical process control, process capability studies, etc. a transition to six-sigma would be a natu...
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- 2006
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10. BPR through ERP: Avoiding change management pitfalls
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Faizul Huq, Ken Cutright, and Ziaul Huq
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Structure (mathematical logic) ,Organizational Behavior and Human Resource Management ,Process management ,Process (engineering) ,Computer science ,Strategy and Management ,Workforce ,Change management ,Position (finance) ,Business process reengineering ,Management process - Abstract
ERP-led BPR implementation often leads to fundamental changes within an organization's structure, culture and management process. Literature cites that a fragmented approach to change management practices is the major reason for BPR failures. The purpose of this paper is to look at the change management process in companies where BPR was implemented through ERP, and thereby obtain some insight into the dynamics of this change process. Many ERP implementers are finding themselves in a position to re-engineer their existing processes to fit the software they are implementing. The paper uses a case study approach that investigates six change management issues at three diverse companies where ERP-led BPR was implemented. The paper shows that through close attention to the change management principles the ERP implementers must integrate the changes with company strategic objectives, and through detailed planning and workforce cultural changes navigate the new system.
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- 2006
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11. Managing change: a barrier to TQM implementation in service industries
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Ziaul Huq
- Subjects
Service (business) ,Quality management ,Process management ,Total quality management ,Service product management ,business.industry ,Strategy and Management ,Service design ,Change management ,Business ,Marketing ,Tertiary sector of the economy ,Financial services - Abstract
PurposeThis paper focuses on six change management issues that address quality management practices in the service sector, difficulty in taking a holistic approach to total quality management (TQM) implementation in the service environment, and the challenges of delivering organizational reform through TQM.Design/methodology/approachThe study employs a quasi‐qualitative case study methodology. Twenty service companies from health care, insurance, consulting, and banking and financial services were studied over a period of two years to assess their change management practices for implementing TQM.FindingsThe findings point to a less than total implementation of TQM in the studied companies. Among other issues, unrealistic expectations of employee commitment, absence of process focus, lack of organization around information flow, holes in education and training, and failure to create a continuous improvement culture contributed significantly towards failure. More successful companies focused on avoiding these potholes with strong leadership that emphasized strategic and tactical planning.Research limitations/implicationsBased on one successful company, the study provides a guideline for successful TQM implementation in a service setting. However, with only one successful company, it would be difficult to generalize to other companies unless future research investigates other successful companies in similar industries, similar economic environment, and market conditions.Originality/valueThe value of the paper lies in the lessons learned that when real and actual approaches to change management follow academic models and techniques of change management, the ability to develop and implement organization‐wide change progresses more smoothly.
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- 2005
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12. A hospital case study supporting workforce culture re-engineering
- Author
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Ziaul Huq and Thomas N. Martin
- Subjects
Total quality management ,Process management ,Process (engineering) ,Critical pathways ,Organization development ,Workforce ,Organizational culture ,Operations management ,Change model ,Business ,Re engineering ,General Business, Management and Accounting - Abstract
This paper presents a case study of a hospital that re-engineered the process for workforce cultural transformation in order to implement successfully its TQM/CQI initiatives. A collaboration, interdisciplinary model that integrated the disciplines of organization development and re-engineering with change model elements from TQM, re-engineering, patient-focused care, critical pathways and organization culture is presented, along with a discussion on the implications of this model.
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- 2002
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13. Workforce Cultural Factors in TQM/CQI Implementation in Hospitals
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Ziaul Huq and Thomas N. Martin
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Inservice Training ,Organizational innovation ,Health (social science) ,Knowledge management ,Leadership and Management ,Strategy and Management ,Organizational culture ,Midwestern United States ,Organizational Case Studies ,Hospital Administration ,Personnel Loyalty ,Humans ,Operations management ,Hospital Costs ,Care Planning ,Problem Solving ,Personnel Administration, Hospital ,Total quality management ,business.industry ,Health Policy ,Organizational Culture ,Organizational Innovation ,Multicenter study ,Workforce ,Employee Performance Appraisal ,Business ,Power, Psychological ,Total Quality Management - Abstract
One of the major obstacles to successful implementation of TQM/CQI in hospitals has been management's failure to consider the workforce cultural situation. This quasi-qualitative study investigates eight workforce cultural factors in seven midwestern hospitals. Results reveal only one of the seven hospitals successfully implementing TQM/CQI.
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- 2001
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14. Conventional shop control procedures to approximate JIT inventory performance in a job shop
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Ziaul Huq
- Subjects
Engineering ,Operations research ,business.industry ,Job shop ,Control (management) ,Kanban ,Flow shop scheduling ,Industrial and Manufacturing Engineering ,Bottleneck ,Manufacturing engineering ,Cycle time ,Hardware and Architecture ,Control and Systems Engineering ,business ,Software ,Production system - Abstract
A two-stage simulation analysis shows that for certain types of manufacturers it is more appropriate to adjust shop control procedures to approximate just-in-time (JIT) inventory rather than to incur a major overhaul in the production system. In the first stage, screening experiments are performed to select the best dispatching rule, allowance-setting rule, batch size, and cycle time. Next, the performance of the selected conventional shop control factors is compared with the kanban simulation results. The results indicate that there are conventional shop control procedures that perform better than JIT in a job shop. It is observed that, even with adequate capacity, bottleneck areas surface due to fluctuation in the shop load. JIT is not appropriate in such a situation. The paper concludes that all shop control approaches do not perform equally well in a good manufacturing environment.
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- 1999
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15. Total quality management contrasts in manufacturing and service industries
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Justin D. Stolen and Ziaul Huq
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Service (business) ,Service system ,Service quality ,Process management ,Total quality management ,business.industry ,Strategy and Management ,Service design ,General Business, Management and Accounting ,Test (assessment) ,Business ,Service guarantee ,Marketing ,Tertiary sector of the economy - Abstract
Offers the view that TQM concepts apply equally to manufacturing and service industries and examines assertions through a survey of selected manufacturing and service companies involved in TQM implementation. To test the hypothesis a framework of 19 TQM dimensions is developed and, based on this framework, the studied companies are evaluated. It is shown that under varied environmental conditions the TQM tools and procedures may vary but the underlying concepts apply equally to both manufacturing and service companies. The differences in the studied dimensions between manufacturing and service companies signify slow dissemination of TQM knowledge among the service companies. Service operations are generally not sure whether the tested procedures in manufacturing companies will work equally well for them. As a result, commitment for a fully fledged TQM has been lacking in the service industries.
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- 1998
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16. A TQM evaluation framework for hospitals
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Ziaul Huq
- Subjects
Total quality management ,Strategy and Management ,Control (management) ,Operations management ,Business ,General Business, Management and Accounting ,Patient care ,Test (assessment) - Abstract
Aims to offer a generic tool to evaluate the health of TQM programmes in hospitals. The developed TQM evaluation tool includes ten management dimensions and eight control and implementation dimensions. To test the validity of the tool and also to obtain a cross‐sectional overview of the status of TQM implementation in hospitals it is used to evaluate the TQM programme in six mid‐western US hospitals. The study was carried out over a period of one year by groups of executive MBA students. Uses a detailed questionnaire to interview three to four personnel directly involved with TQM planning and implementation in these hospitals. Validates this evaluation framework and offers insights into the status of TQM implementation in hospitals. Suggests that TQM efforts have been successful in the support functions; however, in the patient care activities implementation has been minimal. Most importantly, physician involvement in this effort has been very low in the hospitals studied. To remain competitive within the...
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- 1996
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17. The sensitivity of job mix and load capacity bottlenecks on inventory and due date performance in a manufacturing system
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John J. Bernardo and Ziaul Huq
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Engineering ,Operations research ,business.industry ,Job shop ,Strategy and Management ,Control (management) ,Kanban ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,Flow shop scheduling ,Management Science and Operations Research ,Industrial and Manufacturing Engineering ,Bottleneck ,Manufacturing engineering ,Computer Science Applications ,Control system ,Benchmark (computing) ,Sensitivity (control systems) ,business - Abstract
Based on a benchmark job-lot manufacturing system a simulation study was carried out to compare the performance of just-in-time (JIT) shop control system Kanban with conventional job-shop control procedures. The shop control policies were tested under a good manufacturing environment and the effects of job mix and load capacity bottlenecks on various shop control policies were tested. From the simulation results, it is inferred that there are shop control procedures that perform better than the Kanban in a job shop. It has been observed that even with adequate capacity, bottleneck areas surface due to fluctuations in the shop load. Kanban is not appropriate in such a situation because capacity bottlenecks can significantly reduce the ell'ectiveness of a pull system. The disparateness in the processing requirements for jobs can seriously undermine the performance of the shop. This is the type of shop environment where the shop control procedures will be most effective. Although Kanban came out bes...
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- 1995
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18. The sensitivity of rule combinations for scheduling in a hybrid job shop
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Ziaul Huq and Faizul Huq
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Rate-monotonic scheduling ,Job shop scheduling ,Operations research ,Computer science ,Job shop ,Strategy and Management ,Tardiness ,Scheduling (production processes) ,General Decision Sciences ,Flow shop scheduling ,Work in process ,Process manufacturing ,Management of Technology and Innovation ,Operations management - Abstract
Much of the research literature in job shop scheduling deals with pure job shop environments. However, currently most processes involve a hybrid of both the job shop and a flow shop with a combination of flexible and conventional machine tools. Presents a study of such a job shop under varying conditions and performance criteria. Argues that for scheduling in this environment, certain combinations of scheduling rules should be utilized under different arrival rates and for different job types. A simulation model is developed using a hypothetical hybrid job shop to study the performance of rule combinations with variations in arrival rates and processing times. The performance criteria used are flowtime as a measure of work‐in‐process inventory, tardiness for JIT, and throughput for completed items inventory. It was found that rule combination performance varied with the performance criteria. Furthermore, it was found that the combinations were sensitive to arrival rates and processing times. Concludes, from the insights gained in the study, that the rule combination to be implemented should depend on the performance objective and the arrival rate/processing time condition of the hybrid job shop.
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- 1995
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19. Embedding JIT in MRP: The case of job shops
- Author
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Ziaul Huq and Faizul Huq
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Engineering ,Workstation ,business.industry ,Job shop ,Real-time computing ,Critical factors ,Flow shop scheduling ,Industrial engineering ,Industrial and Manufacturing Engineering ,law.invention ,Hardware and Architecture ,Control and Systems Engineering ,law ,Benchmark (computing) ,Embedding ,Time variations ,business ,Software - Abstract
The philosophy and principles needed to institute JIT in any system, including a job shop, are described. A simulation model is developed using a benchmark job shop to study using a pull system in a job shop having variations in processing times, load levels, and machine breakdowns. It is inferred from simulation that JIT can be implemented if certain conditions are met. Processing time variations did not pose a serious impediment, but load levels and machine breakdowns were critical factors. With uneven loading, the resulting capacity bottlenecks make the pull system look like a push system. This can be avoided by processing a uniform mix of jobs to not violate workstation capacity limitations. If machine breakdowns are unavoidable, maintenance of buffer capacity is essential.
- Published
- 1994
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20. Computational fluid dynamic simulation modeling of carbon capture using polyethylenimine impregnated protonated titanate nanotubes
- Author
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Hyoung‐Chul Kim, Hongbo Du, Raghava R. Kommalapati, Ziaul Huque, and Xinhua Shen
- Subjects
computational fluid dynamic simulation ,chemical reactions ,MFiX ,solid amine‐based carbon capture ,titanate nanotubes ,Technology ,Science - Abstract
Abstract A comprehensive computational fluid dynamic (CFD) model of CEES‐developed polyethylenimine impregnated protonated titanate nanotubes (PEI‐PTNTs) was developed using the Multiphase Flow with Interphase eXchanges (MFiX) package to evaluate the performance of the PEI‐PTNTs in a 1‐MW pilot‐scale carbon capture reactor developed by the National Energy Technology Laboratory (NETL). In this CFD model, the momentum, continuity, and energy transport equations were integrated with the first‐order chemistry model for chemical kinetics of heterogeneous reactions to predict the adsorption of CO2 onto amine‐based sorbent particles and the reactor temperature. Based on the amount of the CO2 adsorption obtained in the small‐scale experiment, the coefficients for the chemical reaction equations of PEI‐PTNTs are adjusted. The adjusted PEI‐PTNTs model is applied to the simplified numerical model of 1‐MW pilot‐scale carbon capture system, which is calibrated through the comparison between our simulation results and the results provided by NETL. This calibrated CFD model is used for selecting the optimized flow rate of the gas phase. Our study shows that the optimized gas flow rate to absorb 100% CO2 without loss is 1.5 kg/s, but if higher absorption rate is preferable despite some loss of CO2 absorption in the reactor, a higher flow rate than 1.5 kg/s can be selected.
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- 2020
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21. Environment and resolutions to avoid discontinuity in supply chain management
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Saeedreza Hafeznezami, Ziaul Huq, Seyed Mahmoud Aghazadeh, and Lotfollah Najjar
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Supply chain risk management ,Sustainable development ,Supply chain management ,Renewable Energy, Sustainability and the Environment ,business.industry ,Supply chain ,Geography, Planning and Development ,Environmental resource management ,Disaster recovery ,Management, Monitoring, Policy and Law ,Dispose pattern ,Risk analysis (engineering) ,Economics ,Revenue ,Business continuity planning ,business - Abstract
Supply chain management (SCM) is a quintessential area that entails numerous external factors that are both controllable and uncontrollable. Nature is indeed one of the most influential disruptor that affects a steady supply chain. The US Government has implemented many environmental laws and regulations to protect today's environment from pollutants caused by the general public, governmental operations and businesses. The costs can come in the form of lawsuits, fines, cleanup, testing, disposing and the implementation of necessary technology. Benefits from the execution of these regulations can come in various ways in the end. These include more efficient ways to dispose of chemical wastes, increased revenues, lower cost of production and a better overall wellbeing of the environment, providing a better quality of life for everybody. This paper discusses historical occurrences and suggests proper techniques, such as business continuity planning (BCP) that managers can employ to ensure they are prepared for significant disruptions to their respective supply chains.
- Published
- 2009
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22. Analysis of order review/release methods in a flexible flow shop to minimise work-in-process inventory and average tardiness
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Faizul Huq, Raju Alluri, Ken Cutright, and Ziaul Huq
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Engineering ,Operations research ,Order (business) ,business.industry ,Tardiness ,General Engineering ,Flow shop scheduling ,Work in process ,business ,General Business, Management and Accounting ,Release methods - Abstract
This paper evaluates the effects of Order Review/Release (ORR) mechanisms, priority rules, and loading mechanisms on jobs in a flexible flow shop. Simulation is used to investigate the effect of two ORR mechanisms, three priority rules, and two loading mechanisms on average Work-in-Process (WIP) costs and job tardiness. The results indicate that the loading mechanisms, along with appropriate ORR mechanism, can significantly affect the flow of jobs through the shop.
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- 2008
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23. Computer-aided design: what managers need to know to make it an effective tool
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Faizul Huq and Ziaul Huq
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Engineering ,Computer Networks and Communications ,business.industry ,CAD ,computer.software_genre ,Cad system ,Industrial and Manufacturing Engineering ,Manufacturing engineering ,Computer Science Applications ,Need to know ,Computer-aided manufacturing ,Computer Aided Design ,Product (category theory) ,Electrical and Electronic Engineering ,business ,computer ,Software ,Information Systems ,Design technology - Abstract
This paper explores Computer-Aided Design (CAD) design technology from the stand-point of managers and executives. The capabilities and benefits of CAD are discussed in terms of how CAD can assist companies in becoming more product and cost competitive. Related papers in the literature are surveyed connected to the problems with CAD and the difficulty in implementing a new CAD system. The overall intent of the paper is to provide an executive level discussion on why and how CAD systems can be utilised most effectively.
- Published
- 1999
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24. Employee and Customer Involvement: The Driving Force for Six-Sigma Implementation.
- Author
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Ziaul Huq, Aghazadeh, Seyed-Mahmoud, Najjar, Lotfollah, and Hafeznezami, Saeedreza
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SIX Sigma ,EMPLOYEE participation in management ,EMPLOYEES ,LEADERSHIP ,CONSUMERS - Abstract
The paper highlights the importance of employee/customer involvement in six-sigma implementation. For six-sigma a company not only needs a certain pool of resources, it also needs organizational competencies in terms of a motivated workforce and involved customers. Employee involvement leads to low worker role ambiguity, removal of cultural bottlenecks, worker empowerment, and worker motivation to innovate - an essential component of six-sigma. It brings the customers inside the company to determine the process requirements for resolving issues related to 'Critical to Quality (CTQ)." The paper draws heavily from literature to justify the hypothesis, and confirms it through a case analysis. At the study company management played a leadership role from the very outset of launching its six-sigma program, used participatory management to involve its employees and customers, and provided a platform for everyone in its value chain to come together. The company was successful in creating a culture of participation by providing a compelling mission, a structure that emphasizes flexibility and independence, incentives for participation and a lack of punishment for risk taking, and customer involvement in implementing its projects. [ABSTRACT FROM AUTHOR]
- Published
- 2010
25. Perceptions about benchmarking best practices among French managers: an exploratory survey.
- Author
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Faizul Huq, Marie-Helene Abbo, and Ziaul Huq
- Subjects
BENCHMARKING (Management) ,BEST practices ,EXECUTIVES ,SMALL business ,BIG business - Abstract
Purpose - The purpose of this study is to present a discussion on the most commonly accepted benchmarking norms in the USA, the lessons learned from benchmarking experiences and see how they are translated to benchmarking projects by French managers. Design/methodology/approach - A survey questionnaire is developed, based on the ten-step Xerox benchmarking process, to identify the perceived and/or experienced benchmarking best practices amongst French managers. Large, medium and small companies are surveyed and managers who have participated in or are in the middle of a benchmarking project contributed to the information in developing the conclusions about the perceived best practices, steps and pitfalls for a benchmarking project in French companies. Findings - The survey result showed uniformity amongst French managers from large companies and their opinion on what is important in bringing a benchmarking project to a successful conclusion. There was however lack of uniformity of opinion when it came to what is important in the benchmarking process amongst French managers from companies of different size. Research limitations/implications - Caution should be exercised when interpreting these findings since the paper only used data from an exploratory survey of French managers from companies of varying sizes. The limitation of the study is that the conclusions are applicable to French managers only. In order to compare them one would need survey data, using the same questionnaire from managers in other countries. Practical implications - Indeed, the authors'' findings provide a persuasive argument for what French managers consider important in a benchmarking project. It provides valuable insights into the lessons learned from the years of benchmarking experiences and how these experiences have been translated across cultures. Originality/value - Based on the French experience with the benchmarking process, the critical success factors for benchmarking were identified. Importance of each step in the benchmarking process varies amongst companies, critical issues are company and industry specific. In order to compete successfully in today''s global marketplace, the French managers recognize the importance of benchmarking, although their perceptions of the important steps in the process vary depending on company size. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
26. Impacts of Biodiesel Applied to the Transportation Fleets in the Greater Houston Area
- Author
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Hongbo Du, Ziaul Huque, and Raghava R. Kommalapati
- Subjects
Renewable energy sources ,TJ807-830 - Abstract
Houston, the fourth largest metropolis in the US, currently experiences severe air pollution. Major pollutants, such as VOCs, CO, NOx, PM, SOx, CH4, and CO2, are released from the transportation fleets. To decrease fossil fuel use and greenhouse gas emissions from fleet vehicles, more and more biodiesel is used in vehicles in the Houston metropolis. The GREET model was used for simulating the fuel cycle emissions of diesel vehicles using different biodiesel blends in Houston. The fuels examined were diesel-biodiesel blends of B0, B5, B20, B50, B80, and B100. The energy and water use and emissions from vehicles fueled with the blends were investigated. The study shows that the reductions in GHG emissions are significant at the Well-to-Pump stage, and all the emissions, except GHGs and NOx, reduce at the Pump-to-Wheel stage. The overall Well-to-Wheel analysis shows that biodiesel is beneficial for both passenger cars and heavy duty trucks. However, the benefits are more pronounced for passenger cars compared to heavy duty vehicles. When 50% of diesel passenger cars and HDDTs are switched to B20 in the Greater Houston area in 2025, the daily GHG emissions will be reduced by 2.0 and 712.1 CO2-equivalent tonnes, respectively.
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- 2018
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27. Corrigendum to 'Propagation of Shock on NREL Phase VI Wind Turbine Airfoil under Compressible Flow'
- Author
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Mohammad A. Hossain, Ziaul Huque, and Raghava R. Kommalapati
- Subjects
Renewable energy sources ,TJ807-830 - Published
- 2016
- Full Text
- View/download PDF
28. Review of the Life Cycle Greenhouse Gas Emissions from Different Photovoltaic and Concentrating Solar Power Electricity Generation Systems
- Author
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Raghava Kommalapati, Akhil Kadiyala, Md. Tarkik Shahriar, and Ziaul Huque
- Subjects
life cycle assessment ,greenhouse gas emissions ,solar energy ,photovoltaics ,concentrating solar power ,electricity generation ,Technology - Abstract
This paper contains an extensive review of life cycle assessment (LCA) studies on greenhouse gas emissions (GHG) from different material-based photovoltaic (PV) and working mechanism-based concentrating solar power (CSP) electricity generation systems. Statistical evaluation of the life cycle GHG emissions is conducted to assess the role of different PVs and CSPs in reducing GHG emissions. The widely-used parabolic trough and central receiver CSP electricity generation systems emitted approximately 50% more GHGs than the paraboloidal dish, solar chimney, and solar pond CSP electricity generation systems. The cadmium telluride PVs and solar pond CSPs contributed to minimum life cycle GHGs. Thin-film PVs are also suitable for wider implementation, due to their lower Energy Pay-Back Time (EPBT) periods, in addition to lower GHG emission, in comparison with c-Si PVs.
- Published
- 2017
- Full Text
- View/download PDF
29. Effect on Torque and Thrust of the Pointed Tip Shape of a Wind Turbine Blade
- Author
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Kyoungsoo Lee, Shrabanti Roy, Ziaul Huque, Raghava Kommalapati, and SangEul Han
- Subjects
wind energy ,wind turbine blade ,pointed tip blade ,National Renewable Energy Laboratory (NREL) Phase VI ,shear-stress-transport (SST) Gamma-Theta turbulent model ,separation and transition ,Technology - Abstract
This paper presents the effect of the tip shape of a wind turbine blade on aerodynamic forces, including the effects of separation, transition and stall. A National Renewable Energy Laboratory (NREL) Phase-VI wind turbine blade was used, in which the shape of the tip was modified to a pointed tip. Computational fluid dynamics (CFD) simulations were employed for the analysis and the results were compared with the original NREL blade CFD and experimental data using ANSYS CFX (Ansys Inc., Delaware, PA, USA). To predict the separation and separation-induced transition on both near wall and far away, the shear-stress-transport (SST) Gamma-Theta turbulent model was used. The stall onset of a 20° angle of attack and its effects were also analyzed and presented. The value of torque with the pointed tip blade was found to be 3%–8% higher than the original NREL blade showing the benefit of the pointed tip. Normal force coefficient is lower at the tip for the pointed tip blade, which results in lower deformation of the blade. It was found that the pointed-tip blade is more efficient in terms of generating torque than the original NREL Phase-VI blade in the dynamic stall region of 10–15 m/s wind speeds.
- Published
- 2017
- Full Text
- View/download PDF
30. Propagation of Shock on NREL Phase VI Wind Turbine Airfoil under Compressible Flow
- Author
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Mohammad A. Hossain, Ziaul Huque, and Raghava R. Kammalapati
- Subjects
Renewable energy sources ,TJ807-830 - Abstract
The work is focused on numeric analysis of compressible flow around National Renewable Energy Laboratory (NREL) phase VI wind turbine blade airfoil S809. Although wind turbine airfoils are low Reynolds number airfoils, a reasonable investigation of compressible flow under extreme condition might be helpful. A subsonic flow (mach no. M=0.8) has been considered for this analysis and the impacts of this flow under seven different angles of attack have been determined. The results show that shock takes place just after the mid span at the top surface and just before the mid span at the bottom surface at zero angle of attack. Slowly the shock waves translate their positions as angle of attack increases. A relative translation of the shock waves in upper and lower face of the airfoil are presented. Variation of Turbulent viscosity ratio and surface Y+ have also been determined. A k-ω SST turbulent model is considered and the commercial CFD code ANSYS FLUENT is used to find the pressure coefficient (Cp) as well as the lift (CL) and drag coefficients (CD). A graphical comparison of shock propagation has been shown with different angle of attack. Flow separation and stream function are also determined.
- Published
- 2013
- Full Text
- View/download PDF
31. Quantification of the Lifecycle Greenhouse Gas Emissions from Nuclear Power Generation Systems
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Akhil Kadiyala, Raghava Kommalapati, and Ziaul Huque
- Subjects
lifecycle assessment ,greenhouse gas emissions ,nuclear energy ,power generation ,reactors ,enrichment ,Technology - Abstract
This paper statistically quantifies the lifecycle greenhouse gas (GHG) emissions from six distinct reactor-based (boiling water reactor (BWR), pressurized water reactor (PWR), light water reactor (LWR), heavy-water-moderated reactor (HWR), gas-cooled reactor (GCR), fast breeder reactor (FBR)) nuclear power generation systems by following a two-step approach that included (a) performing a review of the lifecycle assessment (LCA) studies on the reactor-based nuclear power generation systems; and (b) statistically evaluating the lifecycle GHG emissions (expressed in grams of carbon dioxide equivalent per kilowatt hour, gCO2e/kWh) for each of the reactor-based nuclear power generation systems to assess the role of different types of nuclear reactors in the reduction of the lifecycle GHG emissions. Additionally, this study quantified the impacts of fuel enrichment methods (centrifuge, gaseous diffusion) on GHG emissions. The mean lifecycle GHG emissions resulting from the use of BWR (sample size, N = 15), PWR (N = 21), LWR (N = 7), HWR (N = 3), GCR (N = 1), and FBR (N = 2) in nuclear power generation systems are 14.52 gCO2e/kWh, 11.87 gCO2e/kWh, 20.5 gCO2e/kWh, 28.2 gCO2e/kWh, 8.35 gCO2e/kWh, and 6.26 gCO2e/kWh, respectively. The FBR nuclear power generation systems produced the minimum lifecycle GHGs. The centrifuge enrichment method produced lower GHG emissions than the gaseous diffusion enrichment method.
- Published
- 2016
- Full Text
- View/download PDF
32. Optimization of Wind Turbine Airfoil Using Nondominated Sorting Genetic Algorithm and Pareto Optimal Front
- Author
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Ziaul Huque, Ghizlane Zemmouri, Donald Harby, and Raghava Kommalapati
- Subjects
Chemical engineering ,TP155-156 - Abstract
A Computational Fluid Dynamics (CFD) and response surface-based multiobjective design optimization were performed for six different 2D airfoil profiles, and the Pareto optimal front of each airfoil is presented. FLUENT, which is a commercial CFD simulation code, was used to determine the relevant aerodynamic loads. The Lift Coefficient (CL) and Drag Coefficient (CD) data at a range of 0° to 12° angles of attack (α) and at three different Reynolds numbers (Re=68,459, 479, 210, and 958, 422) for all the six airfoils were obtained. Realizable k-ε turbulence model with a second-order upwind solution method was used in the simulations. The standard least square method was used to generate response surface by the statistical code JMP. Elitist Non-dominated Sorting Genetic Algorithm (NSGA-II) was used to determine the Pareto optimal set based on the response surfaces. Each Pareto optimal solution represents a different compromise between design objectives. This gives the designer a choice to select a design compromise that best suits the requirements from a set of optimal solutions. The Pareto solution set is presented in the form of a Pareto optimal front.
- Published
- 2012
- Full Text
- View/download PDF
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