全文获取类型
收费全文 | 3725篇 |
免费 | 142篇 |
国内免费 | 42篇 |
专业分类
管理学 | 243篇 |
劳动科学 | 14篇 |
民族学 | 87篇 |
人口学 | 67篇 |
丛书文集 | 826篇 |
理论方法论 | 180篇 |
综合类 | 2126篇 |
社会学 | 163篇 |
统计学 | 203篇 |
出版年
2024年 | 3篇 |
2023年 | 11篇 |
2022年 | 62篇 |
2021年 | 56篇 |
2020年 | 59篇 |
2019年 | 27篇 |
2018年 | 49篇 |
2017年 | 83篇 |
2016年 | 82篇 |
2015年 | 120篇 |
2014年 | 155篇 |
2013年 | 192篇 |
2012年 | 208篇 |
2011年 | 283篇 |
2010年 | 279篇 |
2009年 | 291篇 |
2008年 | 275篇 |
2007年 | 289篇 |
2006年 | 265篇 |
2005年 | 196篇 |
2004年 | 155篇 |
2003年 | 127篇 |
2002年 | 161篇 |
2001年 | 155篇 |
2000年 | 84篇 |
1999年 | 50篇 |
1998年 | 25篇 |
1997年 | 32篇 |
1996年 | 29篇 |
1995年 | 23篇 |
1994年 | 19篇 |
1993年 | 9篇 |
1992年 | 13篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 2篇 |
1985年 | 2篇 |
排序方式: 共有3909条查询结果,搜索用时 15 毫秒
61.
62.
Concurrent engineering has been widely accepted as a viable strategy for companies to reduce time to market and achieve overall cost savings. This article analyzes various risks and challenges in product development under the concurrent engineering environment. A three‐dimensional early warning approach for product development risk management is proposed by integrating graphical evaluation and review technique (GERT) and failure modes and effects analysis (FMEA). Simulation models are created to solve our proposed concurrent engineering product development risk management model. Solutions lead to identification of key risk controlling points. This article demonstrates the value of our approach to risk analysis as a means to monitor various risks typical in the manufacturing sector. This article has three main contributions. First, we establish a conceptual framework to classify various risks in concurrent engineering (CE) product development (PD). Second, we propose use of existing quantitative approaches for PD risk analysis purposes: GERT, FMEA, and product database management (PDM). Based on quantitative tools, we create our approach for risk management of CE PD and discuss solutions of the models. Third, we demonstrate the value of applying our approach using data from a typical Chinese motor company. 相似文献
63.
The widely used empirical Bayes (EB) and full Bayes (FB) methods for before–after safety assessment are sometimes limited because of the extensive data needs from additional reference sites. To address this issue, this study proposes a novel before–after safety evaluation methodology based on survival analysis and longitudinal data as an alternative to the EB/FB method. A Bayesian survival analysis (SARE) model with a random effect term to address the unobserved heterogeneity across sites is developed. The proposed survival analysis method is validated through a simulation study before its application. Subsequently, the SARE model is developed in a case study to evaluate the safety effectiveness of a recent red‐light‐running photo enforcement program in New Jersey. As demonstrated in the simulation and the case study, the survival analysis can provide valid estimates using only data from treated sites, and thus its results will not be affected by the selection of defective or insufficient reference sites. In addition, the proposed approach can take into account the censored data generated due to the transition from the before period to the after period, which has not been previously explored in the literature. Using individual crashes as units of analysis, survival analysis can incorporate longitudinal covariates such as the traffic volume and weather variation, and thus can explicitly account for the potential temporal heterogeneity. 相似文献
64.
Given a set of points P in a metric space, let l(P) denote the ratio of lengths between the shortest k-edge-connected Steiner network and the shortest k-edge-connected spanning network on P, and let r = inf l(P) P for k 1. In this paper, we show that in any metric space, r 3/4 for k 2, and there exists a polynomial-time -approximation for the shortest k-edge-connected Steiner network, where = 2 for even k and = 2 + 4/(3k) for odd k. In the Euclidean plane,
and
. 相似文献
65.
本文从分析国有企业急需解决的现实问题入手,提出了新形势下系统变革的战略观点,集中研究和探讨了当前我国国企管理发展新变革的十大战略思维,进而提出了国企相应采取的一系列策略与措施。 相似文献
66.
In the current investigation, idiosyncratic deals (i-deals; individualized work arrangements) are modeled as differentiated resources that shape leader-member exchange (LMX) relationships in workgroups. We integrate literature on leader-member exchange (LMX) with research on i-deals to argue that employee evaluations of i-deals received from the grantor –typically the leader- enhance employee perceptions of LMX, which in turn become instrumental in generating positive performance outcomes. Furthermore, because workgroup characteristics have potential implications on the relationship between a deal grantor and the deal recipient, drawing upon social identity theory of leadership, we reason that the i-deals-LMX relationship is affected by the overall value congruence among the group members. Cross-level moderated mediation analyses on multi source data obtained from 289 employees nested in 60 workgroups showed that the mediational role of LMX in the i-deals to performance outcomes relationship was weaker in high value congruence groups. 相似文献
67.
信息不对称、流动性与股权结构——基于深圳证券市场的实证研究 总被引:2,自引:0,他引:2
以金融市场微观结构视角对股权结构进行研究的趋势正在兴起,本文从金融市场微观结构层面考察了在信息不对称影响下股权结构与流动性的关系,通过对在深圳证券交易所上市的2004年和2007年的样本公司研究发现,股权结构变量在2004年主要作用于信息成本来影响流动性水平,而2007年则主要通过改变交易成本来影响流动性水平.股改前的2004年,直接控股股东持股对交易成本无显著影响,而在股改后的2007年则显著增加了交易成本.随着基金的发展壮大,基金持股对流动性的影响逐渐显现,并一定程度上导致交易成本的增加.代表股权集中度的大股东个数则同时增加了信息成本和交易成本,损害了流动性水平. 相似文献
68.
通过对核保和理赔的胜任力特征分析,试图找出能够帮助新员工快速提升其核保和理赔胜任力的培训需求内容。研究1运用关键事件法访谈核保和理赔岗位资深专家,并编码访谈结果,总结出各岗位的胜任力特征。研究2由核保和理赔岗位新员工和老员工(专家)填写胜任力特征调查表,用评价一致性系数对比新老员工对每一项胜任力特征重要性的排序差异,找出专家认为重要而新员工没有重视的特征,得出新员工培训需求。 相似文献
69.
尽管再制造可以重新获得产品的附加价值,但是再制造产品和新产品具有一定的替代性,厂商在各期应该采用何种生产策略?本文选取单一制造厂商,首先讨论无偏好市场下两期再制造最优生产策略,建立厂商利润最大化的经济优化模型;然后给出了再制造成本节约临界值,以便厂商在不同的再制造成本区域内采取合适的价格和产量决策策略;进而将模型拓展,研究无限期的最优产量和定价策略。由于不同产品的再制造成本节约s的比例并不相同,本文通过优化所得的结论进行数据模拟,研究产品回收率和降级率对s*的影响,s对厂商的产量、定价决策及利润的影响,进而分析降级率对产量和价格的影响,为厂商制定产品设计、生产和回收决策提供依据。 相似文献
70.