Philip Hendrix

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In many settings, agents need to identify competent partners to assist them in accomplishing tasks. Direct experience may not provide sufficient data to learn the competence of other agents. Reputation---a community-based assessment of agent competence---can augment direct experience, but is prone to error. This paper addresses the question of when(More)
Daily dietary chromium intake in Belgium has been evaluated by sampling duplicate portions of food, heating them at an acidic pH in a microwave oven and then quantifying the chromium by atomic absorption spectrometry. The mean intake value (53 +/- 31 micrograms/day) is similar to levels found for most other countries and is situated at the lower end of the(More)
The dietary selenium (Se) intake in Belgium has been re-evaluated. Duplicate meal collection, wet acid destruction and flow injection hydride generation atomic absorption spectrometry were used as techniques. The daily intake ranged from 28.4 micrograms (Liège, Walloon part of the country) to 61.1 micrograms (Vilvoorde, central part of the country).(More)
We reviewed 428 renal arteriograms done during a 5-year period to document the accuracy of angiography in the diagnosis of renal mass lesions and non-function. Subsequently, 198 kidneys (46%) were explored for treatment and diagnostic confirmation. Of the kidneys explored 87 (44%) were radiologically diagnosed as benign cysts. At exploration 6 diagnostic(More)
Many multi-agent settings require that agents identify appropriate partners or teammates with whom to work on tasks. When selecting potential partners, agents may benefit from obtaining information about alternative possibilities through gossip (i.e., by consulting others) or using a reputation system (a centralized repository of information about past(More)
In many environments, interdependent agents must work cooperatively to be successful. Cooperative ventures require the participation of multiple partners, and successful ventures require that all partners in the venture fulfill their obligations. In such environments, an agent must identify potential partners with the ability and willingness to help it(More)
Daily dietary manganese intake in Belgium was evaluated by duplicate portion sampling, destruction by cooking in a microwave oven and subsequent analysis for this element by atomic absorption spectrometry. The mean intake value (3.1 +/- 1.1 mg/day) is similar to levels found for most other countries and is within WHO/RDA and National Research Council, USA(More)
Many multi-agent settings require that agents identify appropriate partners or teammates with whom to work on tasks. When selecting potential partners, agents may benefit from obtaining information about the alternatives, for instance, through gossip (i.e., by consulting others) or reputation systems. When information is uncertain and associated with cost,(More)
This paper addresses the problem of learning with whom to interact in situations where obtaining information about others is associated with a cost, and this information is potentially unreliable. It considers settings in which agents need to decide whether to engage in a series of interactions with partners of unknown competencies, and can purchase reports(More)