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A model is developed for the total expected utility to borrowers of an undergraduate text book recommended by a lecturer. It takes account of the peaked demand for a book following a recommendation, measures of borrower satisfaction which involve both waiting time and reading time (loan period), and the persistence of would-be borrowers in requesting books not found on the shelves. Some parameters of the model were estimated by a method which elicited preferences of students in various choice situations; other parameters were estimated by librarians. Some specific conclusions are drawn regarding the optimal loan period of books in terms of their type and the number of copies held. 相似文献
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Paul Wiedemann 《Omega》1978,6(5):427-432
Planning any task that is characterised by the presence of multiple objectives presents the decision maker with a set of special considerations which are not present in the case of decision making with one unique objective. The paper outlines the stages in the formulation of a dynamic multiple-objective objective function and introduces the criterion complex as a decision making construct particularly suited to formulating and solving problems with multiple objectives. The paper then considers some of the mathematical properties of the alternative formulations of criterion complex. 相似文献
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DeRanieri JT Clements PT Henry GC 《Journal of psychosocial nursing and mental health services》2002,40(4):30-37
The goals of grief after sudden traumatic death is to acknowledge the loss, identify the changes the loss will have in the co-victim's life, and reinvest in life within the new structure. Although these goals seem simple, there is no definitive timeline for when these tasks will be engaged and completed by each of the family members. The pathway and time frame for each co-victim may differ. 相似文献
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Nelson Paul 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2002,13(4):377-392
International advocacy strategies devised for the political environment in which World Bank policy is decided are often not suitable for advocacy on broader financial policy and trade issues. Advocacy in these new agendas challenges prevailing models, which depict NGOs as mobilizing powerful governments and international organizations to influence a government's behavior. The patterns of international NGO political activity are diverse, sometimes restraining the power of international rules and authorities over individual governments, and require a new or broader model 相似文献
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We describe the natural history of 13 musculoskeletal conditions requiring hospitalization and identify demographic, behavioral, psychosocial, occupational, and clinical characteristics most strongly associated with disability discharge from the Army. Subjects included 15,268 active-duty personnel hospitalized for a common musculoskeletal condition between the years 1989-1996 who were retrospectively followed through 1997. Back conditions had the greatest 5-year cumulative risk of disability (21%, 19%, and 17% for intervertebral disc displacement, intervertebral disc degeneration, and nonspecific low back pain, respectively). Cox proportional hazards models identified the following risk factors for disability among males: lower pay grade, musculoskeletal diagnosis, shorter length of service, older age, occupational category, lower job satisfaction, recurrent musculoskeletal hospitalizations, more cigarette smoking, greater work stress, and heavier physical demands. Among females, fewer covariates reached statistical significance, although lower education level was significant in more than one model. Modifiable risk factors related to work (job satisfaction, work stress, physical demands, occupation) and health behaviors (smoking) suggest possible targets for intervention. 相似文献