共查询到19条相似文献，搜索用时 312 毫秒
1.
按量交货是订单式生产(MTO)企业赢得客户的基本条件。投产过多,浪费资源;投产不足,不能满足客户需求。因此,投产量决策成为订单式生产(MTO)企业亟需解决的难题。合格率是影响投产量大小的重要原因,同时返工合格率不容忽视。考虑合格率和返工合格率等因素,以期望损失最小化为目标建立多阶段MTO生产系统投产量决策模型,给出合格率和返工率都为常量、离散随机变量或连续随机变量3种情况下的最优投产量表达式,通过算例分析验证模型的可行性,并得出提高合格率和返工合格率、减少合格率离散幅度是企业减少期望损失的关键。 相似文献
2.
裴伟 《内蒙古科技与经济》2018,(10)
本文为降低企业产品过量生产或产量不足而给企业效益带来的负面影响,对以订单式生产方式为主的企业其计划投产量决策问题进行了研究。由于生产过程中多方面因素引起的随机不确定性的特点,导致企业最终产成品的合格率随机波动幅度较大。本文假设产成品合格率的随机波动服从正态分布且在一定范围内,决策目标是最小化损失期望值,建立了产成品投产量优化决策连续模型。并确定研究对象为某模具制造企业,该企业以某订单式生产为主,对此建立产品计划投产量决策离散模型,通过计算的结果来验证该决策模型的有效性。 相似文献
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滤棒是生产卷烟重要原料之一,主要作用是降低卷烟辛辣味和焦油含量,去除杂气,使卷烟口感舒适、醇和。其中滤棒吸阻合格率,是影响卷烟口味的至关重要的物理指标。滤棒在生产过程中,随料位高、低变化所受拉不同而影响丝束喂入量,从而影响滤棒吸阻合格率。研制丝束自动提升装置,使丝束料位保持相同高度喂入,对提高滤棒吸阻合格率起到重要作用。 相似文献
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在当前的电力系统建设中,电压合格率无疑是评定供电质量以及电网规划水平的基本指标。本文分析了目前电压合格率控制工作中存在的问题,探讨了提高电压合格率的具体措施。 相似文献
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阐述了高压管道特别是主汽管道在现场施工中经常出现的质量问题,以及在施工中采用合理的焊接工艺,减少焊接缺陷的产生,以达到提高焊口合格率的目的。 相似文献
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注水合格率是衡量注水质量的指标,是保证开发效果的依据。加强注水井的日常管理,提高分层注水合格率,实现“注够水、注好水”的目标,是提高油田采收率最经济有效的方式。从影响分层异常注水井出现原因入手,认真分析在现场管理过程中分层注水井在地层发生变化、井下管柱故障、水嘴刺大、水嘴堵以及其他一些直接影响合格率的因素。以便在今后的注水井的日常管理中,对测试异常井的各个环节引起注意,并加大分析、处理的力度,从而减少测试异常井数,进一步提高注水合格率。 相似文献
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介绍了脱氯淡盐水的工艺,查找影响脱氯淡盐水合格率的原因并采取了一些措施提高了脱氯淡盐水的合格率。保证了生产系统安全稳定地运行。 相似文献
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数学期望是随机变量的重要的数字特征之一.文章通过民事纠纷、疾病普查和利润的例子探讨了离散型随机变量的数学期望在法律、医学和经济等问题的应用. 相似文献
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在混凝土质量通病防治工作中,把钢筋保护层合格率作为重要考核标准,引起了各施工单位的高度重视。通过箱梁预制的施工,总结了一些提高钢筋保护层合格率的经验,以期对今后钢筋保护层合格率的提高提供一些方法和措施。 相似文献
11.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
17.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
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Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
19.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献