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You searched for +publisher:"Georgia Tech" +contributor:("Nagi, Gebraeel"). Showing records 1 – 3 of 3 total matches.

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Georgia Tech

1. Gong, Xuejian. Collaborative-crowdsourcing product fulfillment for open design and manufacturing.

Degree: MS, Mechanical Engineering, 2018, Georgia Tech

The open business model has attracted much attention from academia and industries alike. It implies many new opportunities for product innovatiopn to transend traditional boundaries and leaverage diverse capabilitied and resources by coherently integrating external partners into the design and manufacturing processes. Such trends lead to the decentralization of the product fulfillment process. Particularly, the open business model offers the opportunities for the small and medium enterprises to fulfill various customer needs in an innovative crowdsourcing manner. While open design and manufacturing sounds appealing, research on formal formulation of crowdsourcing product fulfillment has been very limited. The underlying challenge for adoption and reversion of the open business strategy is the difficulty in justify the population dynamics of crowdsourcing. This thesis puts forward collaborative-crowdsourcing product fulfillment (C2PF) for open design and manufacturing. This work proposes a new product fulfillment workflow to accommodate the decentralized yet collaborative product fulfillment process. The research focus is geared towards the instantiation of the open design and manufacturing with a highly individualized dental braces fulfillment process as a case study. The thesis investigates the fundamental issues underpinning open design and manufacturing. A game-theoretic decision framework is proposed to deal with such critical issues as (1) group decision-making in the product fulfillment processes, (2) dynamics analysis of the external partners’ population, and (3) collaboration-negotiation contracting scheme based on an information contents measure. Since the boundaries are opened to the external partners, the product fulfillment decision-making processes must be reengineered to adapt the collaborative-crowdsourcing process. The workflow of C2PF is established. The supply contracting mechanism is identified as the key pillars to support the product fulfillment flow. In addition, to model the population dynamics of the partners, an evolutionary competition-cooperation game theoretic model is established. The relationships among participation fraction of the partners, the balance of inter-domain capacity, and income and distribution have been established. It reveals a competition-cooperation relationship between the external partners and a co-evolutionary characteristic of the entire population. This model provides a guideline for the management of the open enterprise, with considering of the long-time prosperity. Moreover, to achieve the collaborative crowdsourcing, a generalized supply contracting evaluation mechanism has been proposed. This mechanism supports the collaborative-negotiation from the bidding perspective. The evaluation mechanism handles the uncertainty, aggregates multi-criteria evaluation results and ensures the satisfaction of the requirements. The proposed theory is applied to the open design and manufacturing, respectively. Furthermore, a case study of the dental brace product fulfillment… Advisors/Committee Members: Jiao, Jianxin Roger (advisor), Nagi, Gebraeel (advisor), Choi, Seung-Kyum (committee member), Yao, Donggang (committee member).

Subjects/Keywords: Open enterprise; Open business model; Open innovation; Open design; Open manufacturing; Distributed product fulfillment; Crowdsourcing; Collaborative negotiation; Supply contracting; Game-theoretic decisions

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APA (6th Edition):

Gong, X. (2018). Collaborative-crowdsourcing product fulfillment for open design and manufacturing. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/59956

Chicago Manual of Style (16th Edition):

Gong, Xuejian. “Collaborative-crowdsourcing product fulfillment for open design and manufacturing.” 2018. Masters Thesis, Georgia Tech. Accessed January 15, 2021. http://hdl.handle.net/1853/59956.

MLA Handbook (7th Edition):

Gong, Xuejian. “Collaborative-crowdsourcing product fulfillment for open design and manufacturing.” 2018. Web. 15 Jan 2021.

Vancouver:

Gong X. Collaborative-crowdsourcing product fulfillment for open design and manufacturing. [Internet] [Masters thesis]. Georgia Tech; 2018. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1853/59956.

Council of Science Editors:

Gong X. Collaborative-crowdsourcing product fulfillment for open design and manufacturing. [Masters Thesis]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/59956

2. Solh, Mashhour M. Depth-based 3D videos: quality measurement and synthesized view enhancement.

Degree: PhD, Electrical and Computer Engineering, 2011, Georgia Tech

Three dimensional television (3DTV) is believed to be the future of television broadcasting that will replace current 2D HDTV technology. In the future, 3DTV will bring a more life-like and visually immersive home entertainment experience, in which users will have the freedom to navigate through the scene to choose a different viewpoint. A desired view can be synthesized at the receiver side using depth image-based rendering (DIBR). While this approach has many advantages, one of the key challenges in DIBR is generating high quality synthesized views. This work presents novel methods to measure and enhance the quality of 3D videos generated through DIBR. For quality measurements we describe a novel method to characterize and measure distortions by multiple cameras used to capture stereoscopic images. In addition, we present an objective quality measure for DIBR-based 3D videos by evaluating the elements of visual discomfort in stereoscopic 3D videos. We also introduce a new concept called the ideal depth estimate, and define the tools to estimate that depth. Full-reference and no-reference profiles for calculating the proposed measures are also presented. Moreover, we introduce two innovative approaches to improve the quality of the synthesized views generated by DIBR. The first approach is based on hierarchical blending of the background and foreground information around the disocclusion areas which produces a natural looking, synthesized view with seamless hole-filling. This approach yields virtual images that are free of any geometric distortions, unlike other algorithms that preprocess the depth map. In contrast to the other hole-filling approaches, our approach is not sensitive to depth maps with high percentage of bad pixels from stereo matching. The second approach further enhances the results through a depth-adaptive preprocessing of the colored images. Finally, we propose an enhancement over depth estimation algorithm using the depth monocular cues from luminance and chrominance. The estimated depth will be evaluated using our quality measure, and the hole-filling algorithm will be used to generate synthesized views. This application will demonstrate how our quality measures and enhancement algorithms could help in the development of high quality stereoscopic depth-based synthesized videos. Advisors/Committee Members: Ghassan AlRegib (Committee Chair), Anthony Yezzi (Committee Member), Faramarz Fekri (Committee Member), Monson Hayes (Committee Member), Nagi Gebraeel (Committee Member).

Subjects/Keywords: Stereoscopic; 3D video; Quality assessment; Hole filling; Hierarchical; Depth map; Three dimensional; 3DTV; Video; 3-D television; Three-dimensional display systems; Rendering (Computer graphics)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Solh, M. M. (2011). Depth-based 3D videos: quality measurement and synthesized view enhancement. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/43743

Chicago Manual of Style (16th Edition):

Solh, Mashhour M. “Depth-based 3D videos: quality measurement and synthesized view enhancement.” 2011. Doctoral Dissertation, Georgia Tech. Accessed January 15, 2021. http://hdl.handle.net/1853/43743.

MLA Handbook (7th Edition):

Solh, Mashhour M. “Depth-based 3D videos: quality measurement and synthesized view enhancement.” 2011. Web. 15 Jan 2021.

Vancouver:

Solh MM. Depth-based 3D videos: quality measurement and synthesized view enhancement. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1853/43743.

Council of Science Editors:

Solh MM. Depth-based 3D videos: quality measurement and synthesized view enhancement. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/43743

3. Elwany, Alaa H. Sensor-based prognostics and structured maintenance policies for components with complex degradation.

Degree: PhD, Industrial and Systems Engineering, 2009, Georgia Tech

We propose a mathematical framework that integrates low-level sensory signals from monitoring engineering systems and their components with high-level decision models for maintenance optimization. Our objective is to derive optimal adaptive maintenance strategies that capitalize on condition monitoring information to update maintenance actions based upon the current state of health of the system. We refer to this sensor-based decision methodology as "sense-and-respond logistics". As a first step, we develop and extend degradation models to compute and periodically update the remaining life distribution of fielded components using in situ degradation signals. Next, we integrate these sensory updated remaining life distributions with maintenance decision models to; (1) determine, in real-time, the optimal time to replace a component such that the lost opportunity costs due to early replacements are minimized and system utilization is increased, and (2) sequentially determine the optimal time to order a spare part such that inventory holding costs are minimized while preventing stock outs. Lastly, we integrate the proposed degradation model with Markov process models to derive structured replacement and spare parts ordering policies. In particular, we show that the optimal maintenance policy for our problem setting is a monotonically non-decreasing control limit type policy. We validate our methodology using real-world data from monitoring a piece of rotating machinery using vibration accelerometers. We also demonstrate that the proposed sense-and-respond decision methodology results in better decisions and reduced costs compared to other traditional approaches. Advisors/Committee Members: Nagi Gebraeel (Committee Chair), Chelsea White III (Committee Member), Jeff Wu (Committee Member), Jianjun (Jan) Shi (Committee Member), Lisa Maillart (Committee Member).

Subjects/Keywords: Replacement models; Spare parts inventory; Maintenance policies; Markov decision processes; Reliability; Degradation models; Machinery Maintenance and repair; Plant performance Monitoring; Reliability (Engineering)

…Prof. Nagi Gebraeel, Advisor H. Milton Stewart School of Industrial and Systems Engineering… …would like to express my deepest gratitude to my Adviser, Prof. Nagi Gebraeel. His sincere… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Elwany, A. H. (2009). Sensor-based prognostics and structured maintenance policies for components with complex degradation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/37198

Chicago Manual of Style (16th Edition):

Elwany, Alaa H. “Sensor-based prognostics and structured maintenance policies for components with complex degradation.” 2009. Doctoral Dissertation, Georgia Tech. Accessed January 15, 2021. http://hdl.handle.net/1853/37198.

MLA Handbook (7th Edition):

Elwany, Alaa H. “Sensor-based prognostics and structured maintenance policies for components with complex degradation.” 2009. Web. 15 Jan 2021.

Vancouver:

Elwany AH. Sensor-based prognostics and structured maintenance policies for components with complex degradation. [Internet] [Doctoral dissertation]. Georgia Tech; 2009. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1853/37198.

Council of Science Editors:

Elwany AH. Sensor-based prognostics and structured maintenance policies for components with complex degradation. [Doctoral Dissertation]. Georgia Tech; 2009. Available from: http://hdl.handle.net/1853/37198

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