股票价格的虚拟成分与股市“泡沫”问题的研究

股票价格的虚拟成分就是股票价格高于其净资产价值的部分。但股票价格的虚拟成分过度，就会造成股市“泡沫”化，所以，股票价格虚拟成分要在一定的合理范围。本文认为，依据市盈率指标，能够较准确地判断出股票价格虚拟的合理范围、股市“泡沫”产生的界限及股市“泡沫”存在的合理区间。通过市盈率指标的判断，我国现阶段股票市场“泡沫”程度较为严重。因此，我们应充分认识到因股票价格虚拟过度而造成“泡沫”过大问题的危害，并采取相应对策。

虚拟经济时期

虚拟经济主要指经济中的虚拟成分增加,资产的价格在值的两端随着人们心理变化而上下起伏。一个国家经济的虚拟成分大小,关键在于它的资本市场。由于中国股市的日益发展,规模越来越大,股票资产的虚拟性对国民经济的影响也越来越大。

Characterization of a Powertrain Test Bed in the Context of Virtual Validation of Drivability

Technological trends in the automotive industry toward a software-defined and autonomous vehicle require a reassessment of today’s vehicle development process.The validation process soaringly shapes after starting with hardware-in-the-loop testing of control units and reproducing real-world maneuvers and physical interaction chains.Here,the road-to-rig approach offers a vast potential to reduce validation time and costs significantly.The present research study investigates the maneuver reproduction of drivability phenomena at a powertrain test bed.Although drivability phenomena occur in the frequency range of most up to 30∙Hz,the design and characteristics substantially impact the test setup’s validity.By utilization of modal analysis,the influence of the test bed on the mechanical characteristic is shown.Furthermore,the sensitivity of the natural modes of each component,from either specimen or test bed site,is determined.In contrast,the uncertainty of the deployed measurement equipment also affects the validity.Instead of an accuracy class indication,we apply the ISO/IEC Guide 98 to the measurement equipment and the test bed setup to increase the fidelity of the validation task.In conclusion,the present paper contributes to a traceable validity determination of the road-to-rig approach by providing objective metrics and methods.

观点快递

■启动消费扩大投资孰先孰后国家信息中心预测部的徐连仲先生在一份预测报告中，对于涉及投资和消费及二者关系提出了很重要的两条是：坚持刺激内需增长的政府公共投资政策；制订积极有效的消费政策。很明显，徐先生是持投资与消费双启动观点的一位专家。几乎与此同时，经...

Exact Solutions of VNE: A Survey

Network virtualization is an enabling technology of running multiple virtual networks on a shared substrate network. It aims to deal with the ossification of current network architecture. As a crucial component of network virtualization, virtual network embedding(VNE) can efficiently and effectively allocates the substrate resource to proposed virtual network requests. According to the optimization strategy, VNE approaches can be classified into three categories: exact, heuristic and meta-heuristic solution. The VNE exact solution is the foundation of its corresponding heuristic and meta-heuristic solutions. This paper presents a survey of existing typical VNE exact solutions, and open problems for the future research of VNE exact solutions are proposed.

An efficient adapting virtual intermediate instruction set towards optimized dynamic binary translator (DBT) system

A new efficient adapting virtual intermediate instruction set,V-IIS,is designed and implemented towards the optimized dynamic binary translator (DBT) system.With the help of this powerful but previously little-studied component,DBTs can not only get rid of the dependence of machine(s),but also get better performance.From our systematical study and evaluation,experimental results demonstrate that if V-IIS is well designed,without affecting the other optimizing measures,this could make DBT's performance close to those who do not have intermediate instructions.This study is an important step towards the grand goal of high performance "multi-source" and "multi-target" dynamic binary translation.

A virtual logic analyzer implemented with Arduino

A simple,stable and reliable virtual logic analyzer is presented. The logic analyzer had two modules:one was the test pattern generation module,the other was the logic monitoring module. Combining the two modules,one is able to test a digital circuit automatically. The user interface of the logic analyzer was programmed with LabVIEW. Two Arduino UNO boards were used as the hardware targets to input and output the logic signals. The maximum pattern update rate was set to be 20 Hz. The maximum logic sampling rate was set to be 200 Hz. After twelve thousand cycles of exhaustive tests,the logic analyzer had a 100% accuracy. As a tutorial showing how to build virtual instruments with Arduino,the software detail is also explained in this article.

The Anthroposophy of Professor Radojcic

In this paper, we present life and scientific work of Dr. Milog Radojcic （1903-1975）, the professor of the University of Belgrade and corresponding member of the Serbian Academy of Science and Arts. In the background of all of Radojcic＇s scientific works were the doctrine of anthroposophy and geometry as its essential part. It led him to, at the time, most contemporary problems in mathematics and mathematical physics. His interest in Medieval art reveals a personality capable to unify by itself artistic and scientific worldview. His published works were digitized in 2008 at the Mathematical Institute of the Serbian Academy of Sciences and Arts and exhibited as a part of the virtual library of the National Center for Digitization. Some of his papers, both published and unpublished ones, are extremly actual and their republishing could be very important not only for scientific but also for general public as well

从一封带血的信说起

这是一篇没有丝毫虚拟成分的中学生文字,相信为人父母的家长朋友有兴趣读下去—— “今天,爸爸,妈妈又一次吵架了,他们吵得很凶,爸爸那严肃的脸上挂着滚烫的泪珠。家里的气氛是那样僵,浓重的空气让我窒息.我不知道自己在这场戏中该扮演什么角色,只是一个劲地哭。