所有权与控制权分离条件下企业代理存在的问题及解决途径     

张艳霞  鲁世状 《北京工业职业技术学院学报》2004,3(1):58-60

讨论了企业所有权与控制权分离条件下,代理过程中易出现的问题及解决途径.  相似文献   

改进日光灯电路提高电网的功率因数     

路金星 《北京工业职业技术学院学报》2004,3(4):92-94

日光灯应用非常广泛,但是由于日光灯电路中的镇流器是感性负载,和电源进行能量交换,作无功运行,占用电源的容量.因此,需要改进日光灯电路,提高电源容量的利用率和电网的功率因数.  相似文献   

Output reachable set estimation for discrete-time switched systems with persistent dwell-time     

Shuang Shi  Xin Lu  Yujunrong Ma  Shunqing Ren 《Journal of The Franklin Institute》2019,356(6):3644-3660

This paper is concerned with the output reachable set estimation for discrete-time switched systems. The switching signal is considered as persistent dwell-time (PDT), which is more general and flexible compared with the common dwell-time and average dwell-time switching. The estimation of output reachable set is determined by a collection of bounding ellipsoids based on a family of quasi-time-dependent (QTD) Lyapunov functions. Furthermore, a set of non-fragile QTD controllers is designed. Finally, two examples are employed to illustrate the potentials of proposed methods.  相似文献   

促进经济增长的最优科学技术耦合路径探析     

周小亮  卢雨婷 《科研管理》2019,40(12):62-72

为探究科学、技术对经济增长的影响效应在不同耦合路径下的差异,理论上将科学与技术耦合路径划分为六类,并在内生化科学、引入创新服务部门和人力资本开发部门基础上扩展Romer内生增长模型。通过对扩展模型进行均衡增长路径分析,得到耦合路径与经济增长间的两类关系。以我国为研究对象对这两类关系的数值模拟检验结果表明：科学强势良性路径可在短期内快速提高我国经济增长率,科技中立良性路径则更有利于我国经济长期稳定增长;科技中立路径下耦合成本率的减小有利于经济增长,但科学强势路径下耦合成本率的减小有可能抑制经济增长。由此提出科技管理体制改革中转变政府职能的政策建议。  相似文献   

中国情境下投机导向、创业战略与新企业竞争优势的关系研究          下载免费PDF全文

陈彪  鲁喜凤  尹苗苗 《科研管理》2019,40(8):82-91

创业战略是新企业获取竞争优势的关键手段,现有研究对这一问题展开了初步探讨,但存在不足,仍需要进一步完善。一方面以新企业作为对象来剖析创业战略作用机理的研究缺乏;另一方面,转型情境的关注不足,即转型环境特征对创业战略的作用研究不足。以现有研究为基础,结合新企业特点和中国情境独特性,探讨投机导向、创业战略与新企业竞争优势之间的关系。通过对226家新企业的数据分析,实证结果表明：投机导向和创业战略对新企业竞争优势都会产生积极影响,并且产品创新战略和营销差异化战略在投机导向与竞争优势之间起到部分中介作用。研究成果进一步拓展了战略管理和创业研究领域,并为新企业发展提供了实践指导意见。  相似文献   

The frontier and perspective for tokamak development     

Jiangang Li  Mingjiu Ni  Yu Lu 《国家科学评论(英文版)》2019,6(3):382

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Ecological principle meets cancer treatment: treating children with acute myeloid leukemia with low-dose chemotherapy     

Yixin Hu  Aili Chen  Xinchang Zheng  Jun Lu  Hailong He  Jin Yang  Ya Zhang  Pinpin Sui  Jingyi Yang  Fuhong He  Yi Wang  Peifang Xiao  Xin Liu  Yinmei Zhou  Deqing Pei  Cheng Cheng  Raul C Ribeiro  Shaoyan Hu  Qian-fei Wang 《国家科学评论(英文版)》2019,6(3):469

Standard chemotherapy regimens for remission induction of pediatric acute myeloid leukemia (AML) are associated with significant morbidity and mortality. We performed a cohort study to determine the impact of reducing the intensity of remission induction chemotherapy on the outcomes of selected children with AML treated with a low-dose induction regimen plus granulocyte colony stimulating factor (G-CSF) (low-dose chemotherapy (LDC)/G-CSF). Complete response (CR) after two induction courses was attained in 87.0% (40/46) of patients receiving LDC/G-CSF. Post-remission therapy was offered to all patients, and included standard consolidation and/or stem cell transplantation. During the study period, an additional 94 consecutive children with AML treated with standard chemotherapy (SDC) for induction (80/94 (85.1%) of the patients attained CR after induction II, P = 0.953) and post-remission. In this non-randomized study, there were no significant differences in 4-year event-free (67.4 vs. 70.7%; P = 0.99) and overall (70.3 vs. 74.6%, P = 0.69) survival in the LDC/G-CSF and SDC cohorts, respectively. After the first course of induction, recovery of white blood cell (WBC) and platelet counts were significantly faster in patients receiving LDC/G-CSF than in those receiving SDC (11.5 vs. 18.5 d for WBCs (P < 0.001); 15.5 vs. 22.0 d for platelets (P < 0.001)). To examine the quality of molecular response, targeted deep sequencing was performed. Of 137 mutations detected at diagnosis in 20 children who attained hematological CR after two courses of LDC/G-CSF (n = 9) or SDC (n = 11), all of the mutations were below the reference value (variant allelic frequency <2.5%) after two courses, irrespective of the treatment group. In conclusion, children with AML receiving LDC/G-CSF appear to have similar outcomes and mutation clearance levels, but significantly lower toxicity than those receiving SDC. Thus, LDC/G-CSF should be further evaluated as an effective alternative to remission induction in pediatric AML.  相似文献   

Cloning of a gene-edited macaque monkey by somatic cell nuclear transfer     

Zhen Liu  Yijun Cai  Zhaodi Liao  Yuting Xu  Yan Wang  Zhanyang Wang  Xiaoyu Jiang  Yuzhuo Li  Yong Lu  Yanhong Nie  Xiaotong Zhang  Chunyang Li  Xinyan Bian  Mu-ming Poo  Hung-Chun Chang  Qiang Sun 《国家科学评论(英文版)》2019,6(1):101

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反恐怖主义情报信息工作关联资源及其配置研究          下载免费PDF全文

安璐  葛鑫 《情报科学》2019,37(8):56-64

【目的/意义】全面梳理分析反恐怖主义情报信息工作关联资源,并进行有效配置有助于提升反恐情报信息 工作能力,有力打击恐怖活动。【方法/过程】本文分析反恐情报信息工作的关联资源分布态势,通过对近几年国内 外重大恐怖事件进行定性分析,总结相关部门及每项工作任务中职责主体所需要的资源,并提出关联资源的配置 方案。【结果/结论】反恐活动的各阶段均需要多种类型的资源来收集、处理、利用高质量的情报信息。结合反恐情 报信息工作内容与工作主体的资源配置方案可将反恐情报信息工作关联资源科学配置给相关主体,从而提高反恐 情报信息工作能力。  相似文献   

学术期刊共媒体云与自媒体库互动融合的构想     

郭晓亮  吉海涛  郭雨梅  张璐 《中国科技期刊研究》2019,30(2):161-168

【目的】 结合新时代对学术期刊发展提出的新要求,探讨学术期刊媒体融合的宏观架构设计和有效路径。【方法】 采用文献法明确当前研究的趋势和不足;采用访谈法了解学术期刊四大利益主体的特征、需求及学术期刊媒体融合面临的问题;采用实地调查法明确学术期刊媒体融合的现状与需求,并提出新的媒体融合模式。【结果】 创造性地提出“共媒体云+自媒体库”的互动融合模式,根据学术期刊准产业化运营的整体构想,着眼于学术期刊核心竞争力整合学术内容生产的核心环节,联结四大利益主体,通过相辅相成、互动提高的运行机制促进学术期刊的共生发展。【结论】 “共媒体云+自媒体库”互动融合打破期刊层面和个体层面的传统壁垒,加强两者间的知识共享与互动反馈,突显并强化各自的优势：共媒体云能突显学术期刊的核心业务,兼容多种媒体形态,有利于学术期刊核心竞争力的提升,实现可持续发展;自媒体库有利于促进学术期刊及相关利益主体的有效互动,拓展稿件来源和传播渠道,从源头上提升学术内容生产水平,实现学术利益共同体的互促共赢。  相似文献