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排序方式: 共有149条查询结果,搜索用时 46 毫秒
61.
在星载甚低频(VLF)通信技术中,研究甚低频信号在电离层中的传输特性具有重要意义。现有的利用时域有限差分(FDTD)算法研究电离层传输特性大多基于高频脉冲信号,且传播模型相对粗略,计算存在一定误差。为此,建立了更为精确的电离层各向异性传播模型,对常规的FDTD算法引入变步长因子,并用该算法对VLF波在电离层中的场强衰减进行了数值计算,研究了昼夜变化及频率对其传输特性的影响。仿真结果与卫星实测数据对比表明:与常规的FDTD算法以及全波分析方法相比,引入变步长因子的FDTD算法精度更高;在VLF频段,降低频率有利于电磁波穿透电离层,且白天的衰减明显大于夜间;VLF波在射入电离层并穿透D层时衰减严重(30~40 dB),约为F1层中衰减的3倍。  相似文献   
62.
张琦  王开明   《华东经济管理》2009,23(9):76-80
文章从战略管理的研究现状出发,指出战略过程(Strategy process)研究的重要价值以及现有研究的不足;运用系统论的思想构建了企业战略过程的组织控制模型,并对该模型的战略制定、战略转换以及战略实施三大系统的内部控制结构和运行机制进行了深入分析;在此基础上深刻剖析了企业战略过程组织控制模型的动态平衡机理。  相似文献   
63.
Aims: This study aimed to evaluate the economic value for leuprorelin acetate 6-month depot compared with leuprorelin acetate 3-month depot from a societal perspective in Japanese prostate cancer patients.

Methods: The cost analysis estimated the reduction in direct and indirect costs as well as intangible costs saved by having one less injection. Claims data were used for the analyses of direct and indirect costs reduction. A discrete choice experiment based on a web-based survey estimated the monetary value of the intangible costs for one injection. Another web-based survey of prostate cancer patients, who had received treatment with leuprorelin acetate injections, was carried out to calibrate the results of the discrete choice experiment.

Results: Reductions in medical costs and loss of productivity for having one less injection in prostate cancer patients receiving leuprorelin acetate were JPY 5,670 and JPY 1,723, respectively. Intangible costs saved by using a 6-month depot formulation instead of a 3-month depot formulation for the injection of leuprorelin acetate were estimated to be JPY 19,872, including the values for a reduction in pain (JPY 3,131), injection site reactions (JPY 11,545), waiting time (JPY 9,479), and subtracting the value of medical consultation (JPY 4,283). The total cost reduction for having one less injection was JPY 27,265.

Limitations: The respondents from the internet panel provided by a survey company are not necessarily a representative population of Japanese society.

Conclusions: Leuprorelin acetate 6-month depot has an advantage in monetary value in the reduction in medical costs, loss of productivity, and intangible costs for having one less injection in prostate cancer patients compared with leuprorelin acetate 3-month depot. In the costs for treating with leuprorelin acetate, the percentage of intangible costs might not be negligible. The intangible costs will probably be actively evaluated to proceed to patient-centered healthcare in society.  相似文献   

64.
Today many companies in many industries put a lot of efforts into monitoring and investigating emerging drivers of change in their business environment, particularly in relation to new technologies and events in the social, economic, political and ecological landscapes which surround their industry. So far scholars in the literature on foresight and future studies focused on the techniques and practices for analysing the “state” uncertainty about the likely path of evolution of emerging drivers of change. Anyway, less attention was devoted to the “effect” uncertainty about the impact of drivers of change on the competitive position of the firm and to the “response” uncertainty about how to take advantage of these drivers. These are the main issues we take into account, through a field research on firms that, notwithstanding they were able to properly assess the likely evolution (state uncertainty) of relevant drivers of change in their industry, either were successful or dramatically failed in handling the effect and response uncertainty of these drivers. Moreover, we carried out multiple case studies of some large companies that have established an organizational unit dedicated to strategic foresight. Overall, the results of our research may contribute to improve the effectiveness of strategic foresight and to increase its value added to the planning process of corporate firms, while providing helpful insight to public organizations that promote foresight exercises for enhancing the competitiveness of local firms.  相似文献   
65.
以原有的求解非线性互补问题和变分不等式方法为基础,研究了用不精确牛顿法求解变分不等式的方法,即在用牛顿法迭代的过程中,用一个逼近矩阵A(xk)来近似表示▽F(xk),从而简化计算,降低计算负担.  相似文献   
66.
经济后果观对我国会计准则制定的启示   总被引:3,自引:0,他引:3  
会计准则的经济后果观,要求人们不再把会计准则看成是单纯的技术性规范,而应认识到准则的实施将产生的经济影响,在准则的制定过程中应充分考虑这些影响。文章阐述了会计准则经济后果观的涵义及其与技术观的区别,并在此基础上指出了经济后果观对我国会计准则制定的启示。  相似文献   
67.
浅论对会计政策的思考   总被引:1,自引:0,他引:1  
从会计政策的定义会计政策产生的原因、会计政策根据,其制定主体应分为宏观会计政策和企业会计政策两个层次,会计政策的制定和选择应注重成本效益的原则,并对财税政策的协调四个方面阐述了会计政策的概念,进一步论述了会计政策的制定和选择应注重成效的原则。  相似文献   
68.
The study of participation in the budgetary cycle has formed a prominent part of the research literature concerned with the budgetary process. More recently there has emerged a body of literature concerned with exploring the political and symbolic nature of the budgetary process. The paper reports upon the outcomes of an empirical study of the introduction of `budgetary participation' in a division of a European subsidiary of a large North American car manufacturer. We detail the long process of consultation and negotiation within the subsidiary, and between it and the European Headquarters. The study provides a revealing instance of the roles of formal budget participation as a ritual of control and legitimation without the substantive involvement of middle managers and suggested to us the introduction of de-coupling and organizational hypocrisy alongside the introduction of budget participation. The study pays close attention to the contingent effects of the wider political context of the division and the relationships between the division, its organizational context and organizational environment, and how this context played upon the budgetary process in the division. The outcomes that we analyse at `Delta' reflect the de-coupling strategies and organizational hypocrisies commonly found in public sector organizations. In this wider setting the corporation persists with the ritual of `tight' budget negotiation and target setting and apparent underachievement in performance. Yet we conclude that the complex technological and political context to the formation and siting of Delta continued and may continue to support its existence.$g0  相似文献   
69.
钟军华 《现代食品》2021,27(2):130-134
以低筋面粉、莲子粉为主要原料,鸡蛋为辅料,木糖醇、白砂糖、蛋糕粉为主要添加剂,对莲子蛋糕的加工工艺进行优化.在单因素试验的基础上,进行正交试验,结合感官评价方法,研究确定低糖莲子蛋糕的最佳配方工艺为:低筋面粉90 g,莲子粉30 g,木糖醇100 g,白砂糖60 g,鸡蛋300 g,大豆油20 g,上火180℃,下火1...  相似文献   
70.
阐述了产品标准中检验规范的规定与实施,指出了检验标准是企业产品个有高质量、高效益、有竞争力的技术支持和保证。  相似文献   
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