共查询到20条相似文献,搜索用时 31 毫秒
1.
曾凡斌 《科学.经济.社会》2010,28(4):149-154
整体上市是指一家公司将其主要资产和业务整体改制为股份公司进行上市的做法。辽宁出版传媒选择整体上市不仅有着深刻的政策背景,也是我国传媒资本经营的必然发展。整体上市来源于对剥离上市的扬弃,剥离上市不可避免地引发了大量的关联交易,而不公允的关联交易会给传媒上市公司带来风险。本文以辽宁出版传媒为例,分析了其上市前后的财务资料,并且将其与A股的其他传媒上市公司的财务资料进行对比分析,发现辽宁出版传媒整体上市后,在经营绩效等方面都有一定的提高,产生了有效的市场效应,辽宁出版传媒在资本运营效能上优于传媒板块其他上市传媒公司。本文还对传媒整体上市做出展望,指出传媒整体上市只是为解决自身体制机制问题提供一个平台,整体上市之后传媒企业如何利用资本市场机制改变原有的低效率现象,有效解决公司治理问题,还有待进一步的研究。 相似文献
2.
Myers的优序理论是目前流行的用于解释公司融资偏好的理论之一。各国的融资实践基本上遵循了Myers的优序理论,但也有例外。我国上市公司的融资偏好就是例证。通过静态成本研究方法成功地解释了公司外源性融资偏好的一个动因,得出新股发行价格和无差异价格的比较是推断公司外源性融资偏好的一个必要条件,并利用沪深股市2000-2001年新股发行数据证实了上述结论。 相似文献
3.
In this paper, a model describing the castor three-dimensional dynamic behavior, is presented. A procedure, based on the Udwadia-Kalaba formulation has been implemented to write the castor non-linear motion equations. The model takes into account the flexural and lateral compliance of the castor frame and the phenomena related to the wheel rotation. To prescind from the wheel-road interaction parameters, the hypothesis of no sideslip of the wheel has been adopted but other tire models can be easily implemented. The non-linear system stability is evaluated integrating the motion equations and performing a fitting procedure on the natural steering oscillation. 相似文献
4.
通过对2003~2007年间中国A股上市公司中184家整体上市公司和184家分拆上市公司的对比研究,实证检验了上市模式与两类代理成本和公司绩效之间的关系。结果发现:整体上市公司的第一类代理成本显著低于分拆上市公司,而整体上市公司与分拆上市公司的第二类代理成本并无显著差异,整体上市公司的经营绩效显著高于分拆上市公司。 相似文献
5.
关于创新的经济学思考——上市公司融资资本创新投入的研究 总被引:1,自引:0,他引:1
在国家创新系统中 ,上市公司应当最具创新动力和优势 ,但统计资料显示 ,我国上市公司的创新研究投入总量不足 ,结构也不尽合理。本文运用一些经济学常用的简单数学模型 ,对上市公司融资资本创新研究投入时R&D投入总量、投向偏好等行为进行了分析 ,并得出了鼓励上市公司融资资本参与国家创新系统建设的六项政策建议。 相似文献
6.
中值淘汰法的主要目的是为了打破现代分支系统学中采用最简原理所带来的不确定性僵局。然而,在两个或两个以上分类单元都具有相同衍进指数的情况下,该方法也能不止产生一个分支系统树,因为没有一个客观标准来确定应该先连接哪一个分类单元,而连接的先后顺序不同,就会产生不同的分支系统树。中值淘汰法的作者认为,该法产生的结果不用简约性来判定。但是,该法也能构成最简约的分支系统树。本文还对应用中值淘汰法所面临的问题作了讨论。 相似文献
7.
各种资产重组方式的比较分析 总被引:2,自引:0,他引:2
作者选取了1998年沪市进行资产重组的233家上市公司作为研究样本,对比了各类重组方式上市公司的重缄数据,重组时间、上市时间和财务特征,并对上市公司重组前后两年的财务指标采用主成分法形成综合指标,以此较资产重组的总体效果。 相似文献
8.
传统的分光光度法使用研磨法提取叶绿素a,操作过程易造成光降解,研磨、洗涤转移过程损失大,操作复杂且不利于操作人员安全。本文对反复冻融-浸提法进行了总结,说明了基本操作步骤和注意事项。该方法简化了操作步骤提高效率,提高了分析方法的准确度,更加安全。 相似文献
9.
10.
11.
本文对汽车毛毡轮罩的成型工艺方案进行了简要分析和研究。作者通过对汽车轮罩发展史的概述,使读者了解了汽车轮罩的功效及制造工艺,并对毛毡轮罩的使用效果和成型工艺产生兴趣,然后介绍了毛毡轮罩成型的工艺步骤和关键技术点,通过工艺技术的解析以及难点的解决初步展现了毛毡轮罩的成型加工过程。 相似文献
12.
Dale B. Cherchas 《Journal of The Franklin Institute》1981,312(1):31-40
The probability of wheel climb commencing is calculated using Nadal's formula as a basis. In particular, the functional form of Nadal's formula is maintained with normal probability density functions used to describe the two arguments in Nadal's formula, namely contact plane angle and coefficient of friction at the contact point. The theoretical value of the probability of wheel climb commencing for a given lateral/vertical force ratio value at the wheel flange–railhead interface is then compared with experimental results for positive angles of attack. Theoretical results for negative angles of attack are generated for several cases. 相似文献
13.
14.
Jacek Wojciechowski 《Journal of The Franklin Institute》1984,318(4):215-231
The method of tree generation of a graph decomposed into any number of parts is described in this paper. The decomposition of a graph is defined. The formula for the generation of trees of a decomposed graph is given in Theorem I. The necessary and sufficient conditions which a graph decomposition must satisfy to avoid duplications in the generated set of trees are discussed and results are summarized in Theorems II and III. A criterion for existence of such a decomposition is formulated in Theorem IV and also an appropriate algorithm for the graph decomposition is suggested. 相似文献
15.
《Information processing & management》2022,59(3):102891
Syntax parse trees are a method of representing sentence structure and are often used to provide models with syntax information and enhance downstream task performance. Because grammar and syntax are inherently linked, the incorporation of syntax parse trees in GEC is a natural solution. In this work, we present a method of incorporating syntax parse trees for Grammatical Error Correction (GEC). Building off a strong sequence-to-sequence Transformer baseline, we present a unified parse integration method for GEC that allows for the use of both dependency and constituency parse trees, as well as their combination - a syntactic graph. Specifically, on the sentence encoder, we propose a graph encoder that can encode dependency trees and constituent trees at the same time, yielding two representations for terminal nodes (i.e., the token of the sentence) and non-terminal nodes. We next use two cross-attentions (NT-Cross-Attention and T-Cross-Attention) to aggregate these source syntactic representations to the target side for final corrections prediction. In addition to evaluating our models on the popular CoNLL-2014 Shared Task and JFLEG GEC benchmarks, we affirm the effectiveness of our proposed method by testing both varying levels of parsing quality and exploring the use of both parsing formalisms. With further empirical exploration and analysis to identify the source of improvement, we found that rich syntax information provided clear clues for GEC; a syntactic graph composed of multiple syntactic parse trees can effectively compensate for the limited quality and insufficient error correction capability of a single syntactic parse tree. 相似文献
16.
张国辉 《科技成果管理与研究》2010,(12):74-75
介绍了MG800/2040-WD型采煤机的行走部,并分析其工作方式。对该型电牵引采煤机的行走轮进行改进设计,得到一个更适合齿轮—销排传动方式的行走轮,从而提高了该采煤机的工作效率。 相似文献
17.
18.
以矿山电动轮汽车润滑油加油系统为研究对象,本文提出了一种基于Liapunov稳定性理论的模型参考自适应控制(MRAC)方法。分析了该加油系统的结构特点,建立对应数学仿真模型,再利用超稳定理论推导出加油系统自适应控制律,利用Matlab/Simulink对该数学模型进行仿真。模型仿真结果说明,该系统具有较高的稳态精度和较强的鲁棒性。 相似文献
19.
A vehicle system driven by two independent DC motors is presented here, one of which is used for the right wheel and the other is used for the left wheel. An adaptive compensator using Takagi-Sugeno fuzzy systems is proposed to control the vehicle system. The compensator includes an adaptive model identifier and adaptive controller. An online method is used to adjust the parameters of the identifier model to match the behavior model of the vehicle system. Then, the parameters of the identifier model are employed in a standard parallel-distributed compensator to provide asymptotically stable equilibrium for the closed-loop vehicle drive system, in which the velocity and direction angle of the vehicle are controlled. Results demonstrate that the proposed controller structure is robust to load changes and follows different trajectories very well. 相似文献
20.
机器人滚边压合技术,现在已经被应用于轿车白车身关键部件的包边制造中,主要部件有顶盖天窗、发动机罩盖、行李厢盖、车门、翼子板和轮罩。机器人滚边技术近几年发展比较快,但在实际运用中碰到了一些问题。文章主要探讨机器人滚边技术及现状、案例分析及其应用中存在的问题和处理方法。 相似文献