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101.
A multi-item inventory model with constant demand and infinite replenishment is developed under the restrictions on storage area, total average shortage cost and total average inventory investment cost. These restrictions may be precise or imprecise. Here, it is assumed that inventory costs are directly proportional to the respective quantities, and unit purchase/production cost is inversely related to the demand. Restricted shortages are allowed but fully backlogged. First, the problem is formulated in crisp environment taking the deterministic and precise inventory parameters. It is solved by both geometric programming (GP) and gradient-based non-linear programming (NLP) methods. Later, the problem is formulated with fuzzy goals on constraints and objectives where impreciseness is introduced through linear membership functions. It is solved using the fuzzy geometric programming (FGP) method. The inventory models are illustrated with numerical values and compared with the crisp results. A sensitivity analysis on the optimum order quantity and average cost is also presented due to the variation in the tolerance of total average inventory investment cost and total average shortage cost following Dutta et al., 1993, Fuzzy Sets and Systems, 55, 133-142. 相似文献
102.
Nilabja Guha Anindya Roy Leonid Kopylev John Fox Maria Spassova Paul White 《Risk analysis》2013,33(9):1608-1619
The article proposes and investigates the performance of two Bayesian nonparametric estimation procedures in the context of benchmark dose estimation in toxicological animal experiments. The methodology is illustrated using several existing animal dose‐response data sets and is compared with traditional parametric methods available in standard benchmark dose estimation software (BMDS), as well as with a published model‐averaging approach and a frequentist nonparametric approach. These comparisons together with simulation studies suggest that the nonparametric methods provide a lot of flexibility in terms of model fit and can be a very useful tool in benchmark dose estimation studies, especially when standard parametric models fail to fit to the data adequately. 相似文献
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105.
Scholarly productivity continues to be used as a significant factor when universities make decisions about granting tenure to faculty, allocating resources, and supporting program goals. In 2009, DuPree, White, Meredith, Ruddick, and Anderson reviewed research productivity in faculty from COAMFTE‐accredited PhD programs. As an update, the purpose of this article is to re‐examine scholarly productivity trends among COAMFTE‐accredited doctoral programs through the use of several evaluation methods. Specifically, productivity was examined in the following areas: (a) family therapy journal publications; (b) publications in any type of peer‐reviewed journal; (c) h‐factor index scores; and (d) historic and recent journal publication trends. 相似文献
106.
Merrill ML Taylor NL Martin AJ Maxim LA D'Ambrosio R Gabriel RM Wendt SJ Mannix D Wells ME 《Evaluation and program planning》2012,35(2):280-286
This paper presents a mixed-method approach to measuring the functioning of Safe Schools/Healthy Students (SS/HS) Initiative partnerships. The SS/HS national evaluation team developed a survey to collect partners’ perceptions of functioning within SS/HS partnerships. Average partnership functioning scores were used to rank each site from lowest to highest. Sites with the most favorable perceptions of partnership functioning were defined as having average scores in the top 10% (n = 10) and sites with the least favorable perceptions of partnership functioning were defined as having average scores in the bottom 10% (n = 10). Qualitative data for these 20 sites were inductively open coded for emergent themes and analyzed for patterns using grounded theory approach. Six themes emerged that distinguished sites reporting the most favorable and least favorable perceptions of partnership functioning: partner engagement, facilitators, barriers, shared decision making, partnership structure, and sustainability. Sites reporting the most favorable perceptions of partnership functioning effectively utilized collaboration processes that facilitate coalition building, such as shared decision making, effective communication, and developing a clearly defined structure. Qualitative themes from this analysis provide evidence of validity for the partnership functioning scale used and illustrate distinguishing features between sites with the most favorable and least favorable perceptions of partnership functioning. 相似文献
107.
Ordinarily, the process of decision making by a committee through voting is modeled by a monotonic game the range of whose
characteristic function is restricted to {0, 1}. The decision rule that governs the collective action of a voting body induces
a hierarchy in the set of players in terms of the a-priori influence that the players have over the decision making process.
In order to determine this hierarchy in a swap robust game, one has to either evaluate a power index (e.g., the Shapley–Shubik
index, the Banzhaf–Coleman index) for each player or conduct a pairwise comparison between players, whereby a player i is ranked higher than another player j if there exists a coalition in which i is more desirable as a coalition partner than j. In this paper, we outline an alternative mechanism to determine the ranking of players in terms of their a-priori power.
This simple and elegant method uses only minimal winning coalitions, rather than the entire set of winning coalitions. 相似文献
108.
Within the field of national security and counterterrorism a great need exists to understand covert organizations. To better understand these cellular structures we model and analyze these cells as a collection of subsets of all participants in the covert organization, i.e., as hypergraphs or affiliation networks. Such a covert affiliation network structure is analyzed by evaluating the one-mode projection of the corresponding hypergraph. First we provide a characterization of the total distance in the one-mode projection using its corresponding cell-shrunken version. Secondly we evaluate the one-mode projection with respect to the secrecy versus information tradeoff dilemma every covert organization has to solve. We present and analyze affiliation networks representing common covert organizational forms: star, path and semi-complete hypergraphs. In addition we evaluate an example of a covert organization wishing to conduct an attack and compare its performance to that of the common covert organizational forms. Finally we investigate affiliation networks that are optimal in the sense of balancing secrecy and information. We show how any affiliation tree can be improved by altering its structure. Finally we prove that among covert organizational forms in the class of hypertrees with the same number of cells uniform star affiliation networks are optimal. 相似文献
109.
The purpose of this article is to provide information to improve the quality of care of veterans living in geographically isolated areas who require treatment for mental health issues. Because interactive care solutions are currently hot topics in the health care community, they should be viewed as possible strategies to meet the needs of this specialty group of veterans. An intervention using a mobile clinic and clinical video telehealth reduces distance barriers by making it possible for mental health specialists to come to rural veterans instead of the veteran attempting to find a way to get to the practitioner, who may be located in a clinic or hospital many miles away. This article focuses on an alternate strategy-telehealth in mobile clinics-as a possible solution to the mental health crisis of veterans in rural areas. 相似文献
110.
This paper is an account of a small scale exploratory study about the use and value of football metaphor as a device for facilitating therapeutic work. It is based on an evaluation which used a range of qualitative and quantitative approaches. In this paper, we selectively draw on the qualitative data to provide examples to inform our discussion. We illustrate various ways in which football metaphor can support therapeutic change: by aiding initial engagement, facilitating mutual support, enabling self-understanding and motivating change. We relate our analysis to the literature about the therapeutic value of metaphor and highlight the salience of using football metaphor in a group-based setting for men who are often seen as ‘hard to engage’ in therapeutic support. With some caveats, we argue that football metaphor offers a potentially rich and flexible therapeutic resource. 相似文献