Asset health monitoring continues to be of increasing importance on productivity, reliability, an... more Asset health monitoring continues to be of increasing importance on productivity, reliability, and cost reduction. Early Fault detection is a keystone of health management as part of the emerging Prognostics and Health Management (PHM) philosophy. This paper proposes a Hidden Markov Model (HMM) to assess the machine health degradation. using Principal Component Analysis (PCA) to enhance features extracted from vibration signals is considered. The enhanced features capture the second order structure of the data. The experimental results based on a bearing test bed show the plausibility of the proposed method.
The integrated dial-a-ride problem (IDARP) concerns of the optimal routes of a set of vehicles th... more The integrated dial-a-ride problem (IDARP) concerns of the optimal routes of a set of vehicles that serve the first and last miles of in combination journeys such that a fixed transport service may carry out the longest part of the journey. It implies some modeling and practical issues. Practical wise, it only integrates a single fixed line. It also does not accept any dial-a-ride problem (DARP) request. From the modeling perspective, the transfer node system enlarges quickly with each new request. It also requires more strengthening strategies to be adopted. The proposed integrated dial-a-ride problem fixed-route selection (IDARP-FRS) handles some of these issues. It extends the IDARP to include iterations over a two-line fixed service. An additional set of constraints is devised to easily switch the proposed model to the IDARP and even accommodate users from the dial-a-ride problem. The IDARP-FRS also introduces a set of newly constructed direction-based constraints, for controlli...
Good planning of container terminal operations reduces waiting time for liner ships. Reducing the... more Good planning of container terminal operations reduces waiting time for liner ships. Reducing the waiting time increases customer satisfaction and improves the terminal productivity which gives the container terminal an advantage over its competitors. Berth Allocation and Quay Crane (QC) assignment are major functions in operating container terminals. The Berth Allocation Problem (BAP) generates a berth schedule that determines where and when a ship has to berth alongside the quay. The Quay Crane Assignment Problem (QCAP) determines how many and which quay crane(s) will serve each ship. The model used is an integrated model to solve these two problems simultaneously. We employed an Integer Programming (IP) model and used a construction heuristic to obtain a near optimal solution and then used Simulated Annealing (SA) to improve this solution.
Asset health monitoring continues to be of increasing importance on productivity, reliability, an... more Asset health monitoring continues to be of increasing importance on productivity, reliability, and cost reduction. Early Fault detection is a keystone of health management as part of the emerging Prognostics and Health Management (PHM) philosophy. This paper proposes a Hidden Markov Model (HMM) to assess the machine health degradation. using Principal Component Analysis (PCA) to enhance features extracted from vibration signals is considered. The enhanced features capture the second order structure of the data. The experimental results based on a bearing test bed show the plausibility of the proposed method.
Asset health monitoring continues to be of increasing importance on productivity, reliability, an... more Asset health monitoring continues to be of increasing importance on productivity, reliability, and cost reduction. Early Fault detection is a keystone of health management as part of the emerging Prognostics and Health Management (PHM) philosophy. This paper proposes a Hidden Markov Model (HMM) to assess the machine health degradation. using Principal Component Analysis (PCA) to enhance features extracted from vibration signals is considered. The enhanced features capture the second order structure of the data. The experimental results based on a bearing test bed show the plausibility of the proposed method.
The integrated dial-a-ride problem (IDARP) concerns of the optimal routes of a set of vehicles th... more The integrated dial-a-ride problem (IDARP) concerns of the optimal routes of a set of vehicles that serve the first and last miles of in combination journeys such that a fixed transport service may carry out the longest part of the journey. It implies some modeling and practical issues. Practical wise, it only integrates a single fixed line. It also does not accept any dial-a-ride problem (DARP) request. From the modeling perspective, the transfer node system enlarges quickly with each new request. It also requires more strengthening strategies to be adopted. The proposed integrated dial-a-ride problem fixed-route selection (IDARP-FRS) handles some of these issues. It extends the IDARP to include iterations over a two-line fixed service. An additional set of constraints is devised to easily switch the proposed model to the IDARP and even accommodate users from the dial-a-ride problem. The IDARP-FRS also introduces a set of newly constructed direction-based constraints, for controlli...
Good planning of container terminal operations reduces waiting time for liner ships. Reducing the... more Good planning of container terminal operations reduces waiting time for liner ships. Reducing the waiting time increases customer satisfaction and improves the terminal productivity which gives the container terminal an advantage over its competitors. Berth Allocation and Quay Crane (QC) assignment are major functions in operating container terminals. The Berth Allocation Problem (BAP) generates a berth schedule that determines where and when a ship has to berth alongside the quay. The Quay Crane Assignment Problem (QCAP) determines how many and which quay crane(s) will serve each ship. The model used is an integrated model to solve these two problems simultaneously. We employed an Integer Programming (IP) model and used a construction heuristic to obtain a near optimal solution and then used Simulated Annealing (SA) to improve this solution.
Asset health monitoring continues to be of increasing importance on productivity, reliability, an... more Asset health monitoring continues to be of increasing importance on productivity, reliability, and cost reduction. Early Fault detection is a keystone of health management as part of the emerging Prognostics and Health Management (PHM) philosophy. This paper proposes a Hidden Markov Model (HMM) to assess the machine health degradation. using Principal Component Analysis (PCA) to enhance features extracted from vibration signals is considered. The enhanced features capture the second order structure of the data. The experimental results based on a bearing test bed show the plausibility of the proposed method.
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Papers by Islam Ali