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101.
Seasonal demand for products is common at many companies including Kraft Foods, Case New Holland, and Elmer's Products. This study documents how these, and many other companies, experience bloated inventories as they transition from a low season to a high season and a severe drop in service levels as they transition from a high season to a low season. Kraft has termed this latter phenomenon the “landslide effect.” In this study, we present real examples of the landslide effect and attribute its root cause to a common industry practice employing forward days of coverage when setting inventory targets. While inventory textbooks and academic articles prescribe correct ways to set inventory targets, forward coverage is the dominant method employed in practice. We investigate the magnitude and drivers of the landslide effect through both an analytical model and a case study. We find that the effect increases with seasonality, lead time, and demand uncertainty and can lower service by an average of ten points at a representative company. While the logic is initially counterintuitive to many practitioners, companies can avoid the landslide effect by using demand forecasts over the preceding lead time to calculate safety stock targets. 相似文献
102.
Christopher S. Tang Kairen Zhang Sean X. Zhou 《Production and Operations Management》2015,24(12):1945-1954
We examine two time‐related incentive project management contracts (C1 and C2 contracts) when the manager conducts a reverse auction. Under the C1 contract, the contractor with the lowest bid price wins; however, the manager imposes a linear and symmetric incentive/disincentive for early/late completion according to a pre‐specified due date. Under the C2 contract, the winning contractor has the lowest composite score that is based on the quoted price and the quoted due date; however, in addition to the linear and symmetric penalty/incentive, the contractor is subject to an additional penalty for late completion. While the C2 contract is more sophisticated than the C1 contract (in terms of the number of decisions that each party has to make), our analysis reveals that, unless the project is truly urgent, the more complicated C2 contract adds no value to the manager— the simple C1 contract will suffice. 相似文献
103.
104.
The Type A behaviour pattern (TABP), which relates to risk of coronary heart disease (CHD), has also been shown to relate to self-reported feelings of both psychological and physical distress, at least during those times when the TABP is activated by salient environmental circumstances. The importance of the occupational setting for those with the TABP has led to the speculation that such distress may arise, in part, from job dissatisfaction which comes about when the Type A individual is unable to exert sufficient control over the environment. Associations between the TABP and measures of job dissatisfaction have not, however, been widely reported. The present study examined associations between the TABP, job (dis)satisfaction and self-reported experiences of both psychological and physical distress in a sample of employed individuals, and found tentative evidence that the relationship between the TABP and distress was mediated in a modest way by self-perceived job (dis)satisfaction. The implications of this for the areas of work stress and occupational health are discussed. 相似文献
105.
106.
In many surveys, responses to earlier questions determine whether later questions are asked. The probability of an affirmative response to a given item is therefore nonzero only if the participant responded affirmatively to some set of logically prior items, known as "filter items." In such surveys, the usual conditional independence assumption of standard item response models fails. A weaker "partial independence" assumption may hold, however, if an individual's responses to different items are independent conditional on the item parameters, the individual's latent trait, and the participant's affirmative responses to each of a set of filter items. In this paper, we propose an item response model for such "partially independent" item response data. We model such item response patterns as a function of a person-specific latent trait and a set of item parameters. Our model can be seen as a generalized hybrid of a discrete-time hazard model and a Rasch model. The proposed procedure yields estimates of (1) person-specific, interval-scale measures of a latent trait (or traits), along with person-specific standard errors of measurement; (2) conditional and marginal item severities for each item in a protocol; (3) person-specific conditional and marginal probabilities of an affirmative response to each item in a protocol; and (4) item information and total survey information. In addition, we show here how to investigate and test alternative conceptions of the dimensionality of the latent trait(s) being measured. Finally, we compare our procedure with a simpler alternative approach to summarizing data of this type. 相似文献
107.
Web Survey Design: Paging versus Scrolling 总被引:1,自引:0,他引:1
Peytchev Andy; Couper Mick P.; McCabe Sean Esteban; Crawford Scott D. 《Public opinion quarterly》2006,70(4):596-607
A key choice in the design of Web surveys is whether to placethe survey questions in a multitude of short pages or in longscrollable pages. There are advantages and disadvantages ofeach approach, but little empirical evidence to guide the choice.In 2003 we conducted a survey of over 21,000 undergraduate students.Ten percent of the 10,000 respondents were directed to the scrollableversion of the survey, containing a single form for each ofthe major sections. The balance was assigned to the paging version,in which questions were presented to be visible without scrolling.The instrument contained a maximum of 268 possible questions,including topics that varied in sensitivity and desirability.The survey also permitted comparison of the effect of skip patternsby implementing skip instructions and hyperlinks in the scrollabledesign, and also recorded time at the end of each of the fivetopical sections. Differences between designs are evaluatedin terms of various forms of nonresponse, univariate and bivariatemeasurement properties, and proxies for respondent burden. 相似文献
108.
J. Sean McCleneghan 《The Social Science Journal》2006,43(3):445-451
This 2004 investigation of FM radio stations in seven southwestern states presents a snapshot of where radio news might be heading early in our new millennium. Radio is rarely the topic of discussion, giving it the dubious identity of the “forgotten medium.” Seven discrete variables in the form of YES|NO questions are formulated from a 1993 to 2004 literature review that takes into account the demise of radio news on the FM dial. An e-mail questionnaire was answered by management at N = 61 FM stations regarding newscasts in their daily programming. The picture for radio news on the FM dial is gloomy as budget cuts and consolidations impact the newsroom. 相似文献
109.
This article explores issues of masculinity and violence in the lives of young men in disadvantaged areas in Northern Ireland. Qualitative data were collected in four focus groups, one group of young men from the Catholic community, one group of young men from the Protestant community, one group of community representatives, and one group of Young Offenders ( N = 28). Themes were extracted from the data using a grounded approach. Results indicate that social disadvantage is fundamental to experiences of violence and that young men understand the costs and benefits of a masculine identity that incorporates a capacity for violence. Discussion suggests that initiatives to reduce violent behavior should be compatible with socially and culturally acceptable constructions of masculinity. 相似文献
110.