This report explores the extension of the conventional “kill chain” in a counterintuitive manner.... more This report explores the extension of the conventional “kill chain” in a counterintuitive manner. Utilizing lessons learned from the SEA29 work in “Logistics in a Contested Environment,” the “kill chain” is re-defined backward from warhead detonation to “metal bending and metal delivery.” This process provides a more well-rounded examination of Department of Defense (DOD) efforts to maintain supply lines in a major conflict, specifically, those supply lines that provide key rare earth elements (REE) to DOD weapons contractors. Using linear programming and optimization, this report documents a design of three alternatives for the mining, refinement, and production of REEs. By defining a production equation around our Measures of Effectiveness and Performance (MOE/MOP), we maximized the weighted MOPs while minimizing damage to convoys. From the analysis of results, we found REE components produced remotely (OCONUS) and near CONUS had the best results while using medium and large convo...
Industrial & Engineering Chemistry Research, 2014
The formation of an ultrathin high performance chitosan rejection layer over a poly(ether sulfone... more The formation of an ultrathin high performance chitosan rejection layer over a poly(ether sulfone) (PES) membrane support has been demonstrated in this study for its application in heavy metal removal by nanofiltration (NF). As a natural abundant resource, chitosan features advantages such as hydrophilicity and low cost. The aqueous chitosan solution was coated on the PES support first and partially dried in the fume hood for a certain period of time, before the introduction of hexane solution containing trimesoyl chloride (TMC) on its surface. The cross-linking reaction then took place immediately at the interface between hexane and water. The chitosan concentration and drying duration have been found to greatly affect the membrane morphology and performance. Comparisons with conventional water-soluble cross-linkers have revealed that the interfacial cross-linking by TMC is not only fast and time-saving, but also produces an ultrathin dense-selective layer of crosslinked chitosan with subnanometer pore sizes. As a result, a superior pure water permeability of 3.45 ± 0.25 L m −2 h −1 bar −1 and high salt rejections toward MgCl 2 , Pb(NO 3) 2 , and NiCl 2 have been achieved by the novel NF membrane, making it highly efficient for heavy metal removal.
Artificial intelligence (AI) has the potential to alter many aspects of military operations and i... more Artificial intelligence (AI) has the potential to alter many aspects of military operations and improve overall operational effectiveness. One particularly complex mission domain for the U.S. Department of Defense (DOD) is air and missile defense (AMD). With the proliferation of more advanced weapons, there is a greater need for warfighters to quickly assess the situation, develop an appropriate course of action, and best utilize their warfare assets to respond. This series of activities requires warfighters to have a high level of trust in the system. However, trust in AI systems is not universally defined, and there is no common criteria for evaluating an AI system's trustworthiness. This thesis studies how the established trust factors in the literature could apply to the AMD domain to enable and enhance trust between human operators and future AI-AMD systems, and how trustworthiness can be designed into future AI-AMD systems. The thesis proposes a framework of trust and huma...
This report explores the extension of the conventional “kill chain” in a counterintuitive manner.... more This report explores the extension of the conventional “kill chain” in a counterintuitive manner. Utilizing lessons learned from the SEA29 work in “Logistics in a Contested Environment,” the “kill chain” is re-defined backward from warhead detonation to “metal bending and metal delivery.” This process provides a more well-rounded examination of Department of Defense (DOD) efforts to maintain supply lines in a major conflict, specifically, those supply lines that provide key rare earth elements (REE) to DOD weapons contractors. Using linear programming and optimization, this report documents a design of three alternatives for the mining, refinement, and production of REEs. By defining a production equation around our Measures of Effectiveness and Performance (MOE/MOP), we maximized the weighted MOPs while minimizing damage to convoys. From the analysis of results, we found REE components produced remotely (OCONUS) and near CONUS had the best results while using medium and large convo...
Industrial & Engineering Chemistry Research, 2014
The formation of an ultrathin high performance chitosan rejection layer over a poly(ether sulfone... more The formation of an ultrathin high performance chitosan rejection layer over a poly(ether sulfone) (PES) membrane support has been demonstrated in this study for its application in heavy metal removal by nanofiltration (NF). As a natural abundant resource, chitosan features advantages such as hydrophilicity and low cost. The aqueous chitosan solution was coated on the PES support first and partially dried in the fume hood for a certain period of time, before the introduction of hexane solution containing trimesoyl chloride (TMC) on its surface. The cross-linking reaction then took place immediately at the interface between hexane and water. The chitosan concentration and drying duration have been found to greatly affect the membrane morphology and performance. Comparisons with conventional water-soluble cross-linkers have revealed that the interfacial cross-linking by TMC is not only fast and time-saving, but also produces an ultrathin dense-selective layer of crosslinked chitosan with subnanometer pore sizes. As a result, a superior pure water permeability of 3.45 ± 0.25 L m −2 h −1 bar −1 and high salt rejections toward MgCl 2 , Pb(NO 3) 2 , and NiCl 2 have been achieved by the novel NF membrane, making it highly efficient for heavy metal removal.
Artificial intelligence (AI) has the potential to alter many aspects of military operations and i... more Artificial intelligence (AI) has the potential to alter many aspects of military operations and improve overall operational effectiveness. One particularly complex mission domain for the U.S. Department of Defense (DOD) is air and missile defense (AMD). With the proliferation of more advanced weapons, there is a greater need for warfighters to quickly assess the situation, develop an appropriate course of action, and best utilize their warfare assets to respond. This series of activities requires warfighters to have a high level of trust in the system. However, trust in AI systems is not universally defined, and there is no common criteria for evaluating an AI system's trustworthiness. This thesis studies how the established trust factors in the literature could apply to the AMD domain to enable and enhance trust between human operators and future AI-AMD systems, and how trustworthiness can be designed into future AI-AMD systems. The thesis proposes a framework of trust and huma...
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Papers by Ming Hui Peh