排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
Huang Nansen 《北京大学学报(哲学社会科学版)》2008,(5)
我国改革开放以来,马克思主义哲学的体系创新逐渐成为马克思主义哲学的研究重点之一,作者认为重温黑格尔、马克思、恩格斯和列宁关于构建科学的哲学体系的思想对于推动这个问题的研究是有重要意义的。在作者看来,他们构建科学的哲学体系的主要原则是逻辑与历史一致,其具体表现是哲学范畴、原理从抽象到具体的过程。文章重点论述了列宁构建科学的哲学体系的思想。 相似文献
2.
Bjorn Andersen 《生产规划与管理》2013,24(2):105-106
This paper provides an excursion into various scheduling problems arising in the manufacturing environment and possible approaches that can be taken to solve them. It reviews the research in production scheduling from the perspective of designing and operating a production system and examines the research strategies adopted to find the solution of the practical problems. This review is in the form of the paradigms that evolved during the twentieth century and shows the transition in theory and practice of each paradigm. It covers the fundamental frameworks of scheduling theory, outlining various approaches that can be taken to solve (optimally or approximately) such problems, and the difficulties arising in their practical use. Subsequently, an iterative scheduling process is suggested as an extension of existing paradigms to solve practical production scheduling problems and to bridge the gap between theory and practice in production scheduling and control. 相似文献
3.
Agustina Marconi Nancy Ranum Sarah Van Orman Bjorn Hanson Valerie Donovan Emily Borenitsch 《Journal of American college health : J of ACH》2019,67(3):283-289
Objective: To examine differences in complete response rates for depression screening questions based on demographic characteristics. Methods: Cross-sectional study examining associations between demographic characteristics and completely responding depression-screening questions. Participants: “Healthy Minds Study” data, collected in a public University in February 2016, where 7,326 students participated. Results: women (AOR: 0.69; 95% CI =0.57–0.83) and gay/lesbian students (AOR: 0.24; 95% CI =0.10–0.60) had better complete response rates. Non-US (AOR: 1.46; 95% CI =1.03–2.07), black (AOR: 3.32; 95% CI =1.92–5.77), and Middle-Eastern students (AOR: 3.73; 95% CI =1.73–8.02) had lower complete response rates. Conclusions: Our study shows sex, gender, citizenship, and race categories have significant differences in complete response rates for the outcome. Our findings have several implications; including recognizing interventions for depression based on responders may not target those that tend to be “partial-responders”. Efforts in survey design, recruiting and completion of surveys should be maximized. 相似文献
4.
Bjorn Van Campenhout 《Information, Communication & Society》2017,20(4):530-550
Rapidly expanding mobile network coverage in developing countries offers new ways to reach poor farmers in isolated places. This article explores the potential for Information and Communication Technology to provide agricultural information and extension services to smallholder farmers, and links this to empirical insights of an intervention in Uganda, where community knowledge workers rely on mobile devices to deliver context- and time-sensitive data to farmers. Consistent with theoretical insights related to information inefficiencies, we find that the intervention leads farmers to move away from low-risk low-return crops toward more commercially oriented commodities. Our analysis also suggests that, for the case of maize, the intervention causes farmers to sell less on the market, but at significantly higher prices. 相似文献
5.
Martin Gibbs James Meese Michael Arnold Bjorn Nansen Marcus Carter 《Information, Communication & Society》2015,18(3):255-268
This paper presents findings from a study of Instagram use and funerary practices that analysed photographs shared on public profiles tagged with ‘#funeral’. We found that the majority of images uploaded with the hashtag #funeral often communicated a person's emotional circumstances and affective context, and allowed them to reposition their funeral experience amongst wider networks of acquaintances, friends, and family. We argue that photo-sharing through Instagram echoes broader shifts in commemorative and memorialization practices, moving away from formal and institutionalized rituals to informal and personalized, vernacular practices. Finally, we consider how Instagram's ‘platform vernacular’ unfolds in relation to traditions and contexts of death, mourning, and memorialization. This research contributes to a broader understanding of how platform vernaculars are shaped through the logics of architecture and use. This research also directly contributes to the understanding of death and digital media by examining how social media is being mobilized in relation to death, the differences that different media platforms make, and the ways social media are increasingly entwined with the places, events, and rituals of mourning. 相似文献
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Bjorn Gustavsen 《Human Relations》1998,51(3):431-448
Many efforts to use the social sciences for the purpose of change and reconstruction have their roots in the idea of the field experiment. In various forms, the field experiment played a dominant role in the period 1930-1970. In more recent years, new patterns have emerged, such as complementary research roles in network building. In this contribution, focus is on the links between the early experiments and today's approaches, to see the latter in terms of responses to the challenges posed by the processes that were triggered off by the field experiments. 相似文献
9.
Thomas McAndrew Bjorn Redfors Aaron Crowley Yiran Zhang Shmuel Chen Mordechai Golomb 《Journal of applied statistics》2019,46(10):1903-1916
Combining patient-level data from clinical trials can connect rare phenomena with clinical endpoints, but statistical techniques applied to a single trial may become problematical when trials are pooled. Estimating the hazard of a binary variable unevenly distributed across trials showcases a common pooled database issue. We studied how an unevenly distributed binary variable can compromise the integrity of fixed and random effects Cox proportional hazards (cph) models. We compared fixed effect and random effects cph models on a set of simulated datasets inspired by a 17-trial pooled database of patients presenting with ST segment elevation myocardial infarction (STEMI) and non-STEMI undergoing percutaneous coronary intervention. An unevenly distributed covariate can bias hazard ratio estimates, inflate standard errors, raise type I error, and reduce power. While uneveness causes problems for all cph models, random effects suffer least. Compared to fixed effect models, random effects suffer lower bias and trade inflated type I errors for improved power. Contrasting hazard rates between trials prevent accurate estimates from both fixed and random effects models. 相似文献
10.
An integrated approach to evaluating urban forest functionality 总被引:1,自引:0,他引:1
M. David Oleyar Adrienne I. Greve John C. Withey Andrew M. Bjorn 《Urban Ecosystems》2008,11(3):289-308
Despite the fact that forests in urban areas play multiple and often conflicting roles, research and management efforts are
typically geared towards a single role or purpose. Urban ecology addresses this multiplicity of function by viewing human
and natural systems in urban areas not as separate entities, but as interacting components of an integrated whole. We present
an interdisciplinary approach for evaluating the different ways that forests are often valued: economically, socially, and
ecologically in residential areas of King County, WA. Economic function is measured as the change in housing prices attributed
to location on the gradient, using a hedonic price model. For social function we use a survey to measure (1) residents’ use
of parks and forests, and (2) satisfaction with their neighborhoods. We measure ecological function as songbird species richness,
using bird survey data. Overlaying the curves of economic, social, and ecological function on the common axis of our urban
gradient allows for relationships and tradeoffs to be qualitatively evaluated. Each function responds differently to the gradient.
The housing price response is strongest at high and low levels of urbanization, with positive premiums in both areas. Satisfaction
with neighborhood attributes decreases with increasing urbanization, while the likelihood of mentioning ‘parks’ as an important
element of a resident’s neighborhood increases. Songbird richness peaks in less-developed areas. Evaluating the different
functions together is an important step in recognizing and understanding the multiple roles forested areas play. 相似文献