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2014

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Articles 1 - 10 of 10

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Control And Resilience Within The Maritime Traffic Management Domain, Gesa Praetorius Nov 2014

Control And Resilience Within The Maritime Traffic Management Domain, Gesa Praetorius

Gesa Praetorius

This article presents research conducted within the Vessel Traffic Service (VTS) domain. VTS is a service that is provided close to ports and geographically challenging areas to support merchant vessels in their navigation. Although VTS is legally an advice and assistance service, applying concepts from Cognitive Systems Engineering and Resilience Engineering can highlight how the joint human-machine system works to promote safe and efficient traffic movements. The VTS is a Joint Cognitive System that maintains control through a mixture of opportunistic and tactical control. Strategic control is only partially supported by the higher levels of system aggregation that provide the ...


Electronic Supplement: Value Focused Thinking For Community-Based Organizations: Objectives And Acceptance In Local Development, Jeffrey Keisler, David A. Turcotte, Rachel B. Drew, Michael P. Johnson Jr. Nov 2014

Electronic Supplement: Value Focused Thinking For Community-Based Organizations: Objectives And Acceptance In Local Development, Jeffrey Keisler, David A. Turcotte, Rachel B. Drew, Michael P. Johnson Jr.

Michael P. Johnson

This is an electronic supplement to the manuscript "Value Focused Thinking for Community-Based Organizations: Objectives and Acceptance in Local Development", published by the EURO Journal on Decision Processes.


Tactical Allocation And Acceptance Of Multiple Patient Classes In The Presence Of No-Shows, Lauren Davis, Husniyah Abdus-Salaam Aug 2014

Tactical Allocation And Acceptance Of Multiple Patient Classes In The Presence Of No-Shows, Lauren Davis, Husniyah Abdus-Salaam

Dr. Lauren B Davis

Clinics that provide pediatric care are frequently confronted with family group appointment requests, where parents desire their children to be scheduled simultaneously or consecutively. This is potentially beneficial to the family by minimizing the number of trips to the provider’s office. However, offering prescheduled group appointments have the risk of reducing provider utilization, particularly if the entire group fails to meet their scheduled appointment. Similarly, reserving appointment slots for same day group appointment requests may also decrease utilization and impact profitability. This paper explores the impact of family group appointments on clinic performance in terms of provider utilization and ...


The Viking Biological Investigation: Preliminary Results, Harold Klein, Norman Horowitz, Gilbert Levin, Vance Oyama, Joshua Lederberg, Alexander Rich, Jerry Hubbard, George Lobby, Patricia Straat, Bonnie Berdahl, Glenn Carle, Frederick Brown, Richard Johnson Jun 2014

The Viking Biological Investigation: Preliminary Results, Harold Klein, Norman Horowitz, Gilbert Levin, Vance Oyama, Joshua Lederberg, Alexander Rich, Jerry Hubbard, George Lobby, Patricia Straat, Bonnie Berdahl, Glenn Carle, Frederick Brown, Richard Johnson

Frederick S. Brown

Three different types of biological experiments on samples of martian surface material ("soil") were conducted inside the Viking lander. In the carbon assimilation or pyrolytic release experiment, $^{14}$CO$_{2}$ and $^{14}$CO were exposed to soil in the presence of light. A small amount of gas was found to be converted into organic material. Heat treatment of a duplicate sample prevented such conversion. In the gas exchange experiment, soil was first humidified (exposed to water vapor) for 6 sols and then wet with a complex aqueous solution of metabolites. The gas above the soil was monitored by gas ...


Chloroperoxidase: Ii. Utilization Of Halogen Anions, Lowell Hagar, David Morris, Frederick Brown, Horst Eberwein Jun 2014

Chloroperoxidase: Ii. Utilization Of Halogen Anions, Lowell Hagar, David Morris, Frederick Brown, Horst Eberwein

Frederick S. Brown

Chloroperoxidase can utilize chloride, bromide, and iodide ions and catalyze the formation of a carbon-halogen bond in the presence of suitable acceptor molecules. Suitable halogen acceptor molecules are β-keto acids, cyclic β-diketones, and substituted phenols.

An optical assay has been developed to measure the halogenating activity of chloroperoxidase. The assay is based on the conversion of monochlorodimedon to the corresponding gem-dihalo derivative. The optical assay is based on the loss of absorbance at 278 mµ associated with the formation of the dihalo derivative from the monohalo compound.

In the optical assay, crystalline chloroperoxidase preparations catalyze the formation of the ...


Seed Meal Constituents, Oxazolidinethiones And Volatile Isothiocyanates In Enzyme-Treated Seed Meals From 65 Species Of Cruciferae, Frederick Brown, M. E Daxenbichler, C. H Vanetten, Q. Jones Jun 2014

Seed Meal Constituents, Oxazolidinethiones And Volatile Isothiocyanates In Enzyme-Treated Seed Meals From 65 Species Of Cruciferae, Frederick Brown, M. E Daxenbichler, C. H Vanetten, Q. Jones

Frederick S. Brown

Information is unavailable concerning the amounts and types of isothiocyanate-yielding glucosides in many species of Cruciferae seeds. Because such compounds have nutritional significance, a number of unreported species were investigated. Information about the parent thioglucosides was obtained by estimation of the oxazolidinethione and steam-volatile isothiocyanate contents of enzymatic hydrolyzates of the seed meals. Significant amounts of oxazolidinethione were found in hydrolyzates from 11 species not previously known to contain such glucosidic precursors. Oxazolidinethione (calculated as vinyl oxazolidinethione) measurements ranged from 0 to 19.3 mg. per gram of pentane- hexane-extracted meal. Total volatile isothiocyanate measurements (calculated as butenyl isothiocyanate) ranged ...


Racemization Of Amino Acids In Sediments From Saanich Inlet, British Columbia, Keith Kvenvolden, Etta Peterson, Frederick Brown Jun 2014

Racemization Of Amino Acids In Sediments From Saanich Inlet, British Columbia, Keith Kvenvolden, Etta Peterson, Frederick Brown

Frederick S. Brown

In sediments spanning the last 9000 years from Saanich Inlet L enantiomers of amino acids are most abundant, but the percentages of D enantiomers increase with age, apparently because of partial racemization. Of the amino acids measured, glutamic acid and alanine show the greatest degree of racemization; leucine, isoleucine, and valine show the least.


Scheduling Food Bank Collections And Deliveries To Ensure Food Safety And Improve Access, Lauren Davis, Irem Sengul, Julie Ivy, Luther Brock, Lastella Miles Apr 2014

Scheduling Food Bank Collections And Deliveries To Ensure Food Safety And Improve Access, Lauren Davis, Irem Sengul, Julie Ivy, Luther Brock, Lastella Miles

Dr. Lauren B Davis

Food banks are privately-owned non-profit organizations responsible for the receipt, processing, storage, and distribution of food items to charitable agencies. These charitable agencies in turn distribute food to individuals at risk of hunger. Food banks receive donated food from national and local sources, such as The Emergency Food Assistance Program (TEFAP) and supermarkets. Local sources with frequent high-volume donations justify the use of food bank vehicles for collection. Food bank vehicles are also used to deliver food to rural charitable agencies that are located beyond a distance safe for perishable food to travel without spoilage. Due to limited funds, food ...


A Review Of Parallel Operation Of Active Power Filters In The Distributed Generation System, Shafiuzzaman Khadem, Malabika Basu, Michael Conlon Mar 2014

A Review Of Parallel Operation Of Active Power Filters In The Distributed Generation System, Shafiuzzaman Khadem, Malabika Basu, Michael Conlon

Dr. Shafiuzzaman Khan Khadem

In this paper a technical review of parallel operation of Active Power Filter (APF) for harmonic power compensation in distributed generation (DG) network has been presented. Controlling methods and connection topologies with their pros and cons are described. Recent improvements in controlling and future trends for the application of APFs in distributed mode are also identified.


Maritime Traffic Management: A Need For Central Coordination?, Fulko Van Westrenen, Gesa Praetorius Jan 2014

Maritime Traffic Management: A Need For Central Coordination?, Fulko Van Westrenen, Gesa Praetorius

Gesa Praetorius

Traffic management is not formally organised in the maritime domain. Ships are autonomous and find their own way. Traffic is organised through rules, regulations, and “good seamanship”; it is a distributed system. In areas of high traffic-density support is proved by vessel traffic service (VTS) to promote traffic safety and fluency. VTS does not take control. This organisational structure has proven itself in situations with sufficient resources. When resources become insufficient (e.g. not enough sailing space), the traffic needs an organising mechanism. In this article, the authors argue that the most promising way to do this is by organising ...