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Articles 1 - 11 of 11

Full-Text Articles in Engineering

Minimization Of Costs In Interconnected Supply Networks With Transportation And Decision-Making Delays, Ilker I. Delice, Rifat Sipahi, Tucker J. Marion Sep 2010

Minimization Of Costs In Interconnected Supply Networks With Transportation And Decision-Making Delays, Ilker I. Delice, Rifat Sipahi, Tucker J. Marion

Rifat Sipahi

No abstract provided.


Stability Analysis Of A High Dimensional Supply Network With 5 Delays, Rifat Sipahi Sep 2010

Stability Analysis Of A High Dimensional Supply Network With 5 Delays, Rifat Sipahi

Rifat Sipahi

No abstract provided.


Stability Analysis Of A Lti-Tds Dynamics With Four (4) Independent Delays, Rifat Sipahi Sep 2010

Stability Analysis Of A Lti-Tds Dynamics With Four (4) Independent Delays, Rifat Sipahi

Rifat Sipahi

No abstract provided.


Stability Of Traffic Flow Behavior With Distributed Delays Modeling The Memory Effects Of The Drivers, Rifat Sipahi, Fatihcan M. Atay, Silviu-Julian Niculescu Sep 2010

Stability Of Traffic Flow Behavior With Distributed Delays Modeling The Memory Effects Of The Drivers, Rifat Sipahi, Fatihcan M. Atay, Silviu-Julian Niculescu

Rifat Sipahi

Stability analysis of a single-lane microscopic car-following model is studied analytically from the perspective of delayed reactions of human drivers. In the literature, the delayed reactions of the drivers are modeled with discrete delays, which assume that drivers make their control decisions based on the stimuli they receive from a point of time in the history. We improve this model by introducing a distribution of delays, which assumes that the control actions are based on information distributed over an interval of time in history. Such an assumption is more realistic, as it takes into consideration the memory capabilities of the …


An Alternative Characterization Of Robust Stability And Stability Radius For Linear Time Delay Systems, Bahram Shafai, Hanai Sadaka, Rifat Sipahi, Jie Chen Sep 2010

An Alternative Characterization Of Robust Stability And Stability Radius For Linear Time Delay Systems, Bahram Shafai, Hanai Sadaka, Rifat Sipahi, Jie Chen

Rifat Sipahi

No abstract provided.


Stability Of A Linear Time Invariant Dynamics With 3 Independent Delays, Rifat Sipahi Sep 2010

Stability Of A Linear Time Invariant Dynamics With 3 Independent Delays, Rifat Sipahi

Rifat Sipahi

No abstract provided.


First Order Approximation Of The Stability Regions Of Time Delay Systems -- Removed From View At The Discretion Of Northeastern University Libraries (9/16/2010), Rifat Sipahi, Silviu-Julian Niculescu Sep 2010

First Order Approximation Of The Stability Regions Of Time Delay Systems -- Removed From View At The Discretion Of Northeastern University Libraries (9/16/2010), Rifat Sipahi, Silviu-Julian Niculescu

Rifat Sipahi

No abstract provided.


Delay Modeling In Supply Network Dynamics: Performance, Synchronization, Stability, Rifat Sipahi Sep 2010

Delay Modeling In Supply Network Dynamics: Performance, Synchronization, Stability, Rifat Sipahi

Rifat Sipahi

Recent research results in Industrial Engineering and Business disciplines specifically emphasize the critical role of delays in the functionality of supply networks. Delays are inevitable and pervasive; they arise due to the time needed for material deliveries, information flow and human perception towards adjusting to new decisions. Delays are endangering as they contaminate decision-making which ultimately leads to poor performance, synchronization problems and fluctuating inventory levels resulting in major economical losses. It is critical to state that inventory regulation and synchronization in supply networks even without delays is an open problem today due to large scale of the network, nonlinearities, …


An Efficient Numerical Approach For The Stability Analysis Of A Class Of Lti Systems With Arbitrary Number Of Delays, Rifat Sipahi Sep 2010

An Efficient Numerical Approach For The Stability Analysis Of A Class Of Lti Systems With Arbitrary Number Of Delays, Rifat Sipahi

Rifat Sipahi

Abstract: A practical and numerically efficient algorithm is presented for determining the stability robustness map of a general class of higher order linear time invariant (LTI) systems in the parametric space of arbitrary number of independent delays. The stability of this class of dynamics is of particular interest in low-gain design and multi-agent control problems. The backbone of the new algorithm is inspired by a scaled frequency sweeping technique which enables the exhaustive determination of stability switching hypersurfaces in the parametric space of delays, without requiring nested loops. Two case studies are presented in order to demonstrate the strength of …


Hybrid Genetic Algorithm For Optimizing Environmental/Economic Power Dispatch, Dr. Adel A. Elbaset Jun 2010

Hybrid Genetic Algorithm For Optimizing Environmental/Economic Power Dispatch, Dr. Adel A. Elbaset

Dr. Adel A. Elbaset

الملخص العربي من أهم القضايا التي تهم العاملين في مجال البيئه في هذه الاّونه هي قضيه تقليل الأنبعثات الملوثه من كافه المصادر. يقدم هذا البحث طريقه جديده لتغذيه الأحمال وتوزيعها بين وحدات التوليد الكهربائيه المختلفه بطريقه إقتصاديه أخذين في الأعتبار تقليل الأنبعاثات الملوثه الصادره من وحدات التوليد التي تعمل بالوقود الأحفوري. مسأله أخذ تأثير الأنبعاثات الملوثه وإقتصاديات التشغيل علي توزيع الأحمال عبارة عن مساله مثاليه غير خطيه متعددة القيود والأهداف تم تحويلها إلي داله ذات هدف واحد عن طريق معامل العقوبه (Penalty factor) . يقدم هذا البحث طريقه للحل تعتمد علي نموذج رياضي باستخدام طريقة الحساب الجيني المختلط (Hybrid Genetic …


From Automatic Identification And Data Capture (Aidc) To “Smart Business Process”: Preparing For A Pilot Integrating Rfid, S. F. Wamba, E. Lefebvre, Y. Bendavid, L.. A. Lefebvre Jan 2010

From Automatic Identification And Data Capture (Aidc) To “Smart Business Process”: Preparing For A Pilot Integrating Rfid, S. F. Wamba, E. Lefebvre, Y. Bendavid, L.. A. Lefebvre

Dr Samuel Fosso Wamba

This paper examines the underlying logic behind the rules configured in a RFID middleware to support “smart business processes” in one retail supply chain. Through a detailed investigation of the underlying business processes, we will demonstrate how businesses rules can be defined, configured and refined in a RFID middleware. The results confirm that RFID technology is not a “Plug and Play” solution. RFID middleware configuration will require a high level of customization. Finally, this study allows the improvement of our understanding of the real potential of RFID technology in the supply chain context.