数控线切割编程中3B程序与CNC程序的转换及应用

数控线切割编程技术在线切割加工中起着主导作用。目前国内外采用的程序格式是CNC国际通用G代码,该程序操作简单、方便、快捷、准确。早期国产数控线切割机床的程序编制采用3B(4B)程序。这些机床的市场占有率仍很大,若更换为有G代码编程的控制柜其费用相当于原机床的售价。本文提出了一种简单的方法,可以将3B(4B)程序直接转换为CNC(ISO代码)程序,而使CNC编程的机床与原3B(4B)编程的国产机床实现数据共享。     

企业兼容竞争的博弈分析

本文以双寡头博弈模型为基础，考察了产品兼容对企业价格和利润的影响，就在位企业和新进入企业如何利用兼容策略增强其竞争力进行了分析。本文的结论是，借助于历史销售优势和适当的兼容策略，优势企业可以设置策略壁垒来阻止潜在进入者的进入和胁迫市场内的竞争对手退出市场，劣势企业也可以凭借生产兼容性能相当优越或单向兼容的产品参与市场竞争。     

“颠覆者”大连光洋

我是被这样一条消息“击中”的。5月12日9时许,大连光洋的一位员工在他的新浪微博上说：“这不是一个普通的工地,这里凝聚了一批有理想的人的梦想,四个月后亚洲最大的全地下工厂将竣工,这个地下工厂所生产的高端数控机床将彻底打破欧美日在中国高端市场的垄断地位。     

UNRAVELING THE PROCESS OF CREATIVE DESTRUCTION: COMPLEMENTARY ASSETS AND INCUMBENT SURVIVAL IN THE TYPESETTER INDUSTRY

When radical technological change transforms an industry established firms sometimes fail drastically and are displaced by new entrants, yet other times survive and prosper. Drawing upon an unusually rich data set that covers the technological and competitive history of the typesetter industry from 1886 to 1990, this paper uses a combination of quantitative and qualitative analysis to unravel this process of creative destruction. It argues that the ultimate commercial performance of incumbents vs. new entrants is driven by the balance and interaction of three factors: investment, technical capabilities, and appropriability through specialized complementary assets. In this industry, specialized complementary assets played a crucial role in buffering incumbents from the effects of competence destruction, and an analysis that examined investment or technical capabilities in isolation would have led to misleading results. This work thus highlights the importance of considering multiple perspectives when examining the competitive implications of technological change. © 1997 by John Wiley & Sons, Ltd.     

机床产品设计中的模块化技术研究

论文分析了国内外重型机床模块化技术应用状况,提出了重型机床模块化划分的基本原则,阐明了机床产品模块化设计方法,并以数控重型立车产品为例验证方法的正确性。     

CUT‐THROAT FRINGE COMPETITION IN AN EMERGING COUNTRY MARKET: TAX EVASION OR THE ABSENCE OF MARKET POWER?*

Brazil's established soft‐drink firms recently lost ground to multiple low‐price entrants, with small‐scale operations and minimal advertising. While incumbents attributed such undercutting to entrants' lower costs from non‐compliance with the law, ‘generics’ counterargued that incumbents' high prices stemmed from unilateral market power rather than cost heterogeneity. By estimating a structural model, I can single‐handedly explain established brands' high prices through low equilibrium price elasticities of demand. Tax evasion in the fringe, while plausible, appears to be offset by higher procurement costs or less efficient scale. More generally, a competitive informal sector can alleviate the allocative distortions in certain concentrated industries.     

Modelling the effect of buyer and seller power on the margins of commodity plastics

In the last decade, large sectors of the chemical and plastics industries in the U.S.A. and West Europe have suffered drastic declines in price and gross margin during periods of low use of industry capacity. This paper shows that the major changes in gross margin observed for some commodity plastics can be modelled successfully in terms of the balance between buyer power and seller power. These industries have visibility of prices and industry occupacity and comparable concentrations of sellers and important buyers. The modelling follows Burgess (1982) in expressing buyer and seller power as simple functions of buyer and seller concentrations, industry occupacity and ‘cohesion’ between sellers. This work provides a first practical test of this new approach. It is shown that the model fits the observed data best if the ‘cohesion’ declines as occupacity declines. It is suggested that the approach would be useful in understanding the behaviour of other ‘near-commodity’, capital-intensive businesses, and in helping to distinguish between those businesses where margins are likely to remain relatively stable and those which might face drastically declining margins if the industry occupacity declines or new entrants change the balance between sellers and buyers.     

Did federal regulation discourage facilities-based entry into US local telecommunications markets?

In the United States from 2001 to 2006, federal regulations allowed entrants to lease from incumbents at relatively low cost all of the network infrastructure necessary to provide local phone service. These platform entrants could then provide phone service without installing any of their own equipment. Advocates of this policy claimed that it was needed to provide an economically feasible means by which entrants could serve residential customers. Critics contended that the policy substantially deterred loop entry whereby entrants installed their own switching equipment. An analysis of panel data for each state over this period indicates that the policy's critics may have been correct. The cross-price elasticity of loop entry with respect to platform price was roughly 1.0. A back of the envelope calculation suggests that loop entry may have decreased by roughly 20% due to platform entry price reductions.     

Dynamic Entry and Investment in New Infrastructures: Empirical Evidence from the Fixed Broadband Industry

In the telecommunications industry, the ladder-of-investment approach claims that service-based competition (when entrants lease access to incumbents’ facilities) can serve as a “stepping stone” for facility-based entry (when entrants build their own infrastructures to provide services). In this paper, we build an empirical model that encompasses a complete ladder-of-investment, composed of three rungs: bitstream access, local loop unbundling and new access facilities. Using data from the European Commission’s “Broadband access in the EU” reports covering 15 European member states for 17 semesters, we test the ladder-of-investment hypothesis. We find no empirical support for this hypothesis, that is, for the transition from local loop unbundling to new access infrastructures, and weak empirical support for the transition from bitstream access lines to local loop unbundling. These results are robust when we take into account the migration effect, the number of access rungs, the development of broadband cable, the regulatory performance, and the evolution of local loop unbundling prices.     

Food scare crises and price volatility: The case of the BSE in Spain

Recent incidents of contaminated food products coupled with the widespread diffusion of news by mass media and the growing social concerns about food safety, have resulted in significant food market crises. One of the most highly publicized recent food scares involved Bovine Spongiform Encephalopathy (BSE). In our analysis, we evaluate the impacts from a BSE outbreak on the price volatility transmission along the Spanish food marketing chain by using a smooth transition conditional correlation (STCC) GARCH model. Our work is the first to assess price volatility responses to food scares. Results suggest that two distinct regimes involving different price volatility behavior can be distinguished, one characterized by turbulent markets and another where markets are calming down.     

Total factor productivity growth in Uganda’s telecommunications industry

The telecommunication sector is usually thought to be characterized by high productivity growth rates arising from increasing returns to scale. The actual productivity patterns in the sector, however, need to be empirically determined. A panel data set was assembled and a common set of input and output indicators was constructed to support the estimation of the Malmquist Total Factor Productivity index via input-oriented Data Envelopment Analysis. A general specification encompassing all available input and output data was employed to obtain the average total factor productivity changes for the sector. Over the study period, there was total factor productivity growth in Uganda’s telecommunications industry, which was mainly due to technical or technological progress as opposed to technical efficiency. These results indicate the existence of a potential for tariff reduction via the X-factor in the price cap formula.     

突破性创新、互补性资产与企业间合作的整合研究

主导企业在技术变革中经历了技术劣势后，这种劣势在何种程度上转化为商业劣势取决于突破性创新的破坏幅度。如果新技术只破坏了主导企业的技术能力而没有破坏互补性资产的价值．那么主导企业的绩效将会改进：如果新技术同时破坏了主导企业的技术能力和互补性资产的价值．那么主导企业的绩效将会下滑。正是由于大量突破性创新属于前者并且主导企业控制了大部分的互补性资产．开发了突破性创新的新进入企业只能与主导企业建立合作关系．共同分享创新利润。     

Non-Discriminatory Pricing,Partial Backward Ownership,and Entry Deterrence

This article demonstrates that entry deterrence can occur when downstream incumbents hold non-controlling ownership shares of a supplier that does not price-discriminate. Such backward ownership implies a rebate on the input price for the incumbents and a competitive disadvantage for downstream entrants. An industry can use non-controlling ownership to change the pricing of a supplier in a way that appears to be accommodating but in fact deters entry. The supplier benefits from an obligation or a commitment to supply the customers under equal terms, as this induces profitable sales of ownership stakes to incumbent downstream firms.     

ENTRY DETERRENCE BY NON‐HORIZONTAL MERGER*

We study when and how pure non‐horizontal mergers, whether cross‐product or vertical, can deter new entry. Organizational mergers implicitly commit firms to more aggressive price competition. Because heightened competition deters entry, mergers can occur in equilibrium even when, absent entry considerations, they do not. We show that, in order to prevent a flood of entrants, mergers arise even when a marginal merger costs incumbent firms more than does a marginal entrant.     

New technology and job design: the case of CNC

This article is based on a three-year study of the introduction and use of computer numerically controlled machine tools (CNC) into nine engineering companies. It rejects the view that technology determines job design and instead highlights the role of managerial values and competence and organisations'own structures and practices .     

The multi-channel challenge: A dynamic capability approach

The maturing of e-commerce, the diffusion of call centres into the B2B space and purchaser demands on price and service are leading to rapid change in the route to market in many B2B sectors, with shifting combinations of channels being offered to the customer in the search for advantage. In this situation managers can no longer rely on the channel resources that they have assembled to provide their extant competitive position. Instead they must be able to combine resources in new ways, gain additional resources and dispose of superfluous resources, and to do this repeatedly and rapidly if they are to compete successfully. The term ‘dynamic capabilities’ has emerged in the strategic management literature for these activities. Using four case studies and the analytic induction approach to data analysis, we identify seven dynamic capabilities for channel transformation.     

The importance of being first : The case of prescription drugs in Canada

There is a growing literature on the importance of being first, which suggests that where there is uncertainty about the product quality of late entrants' brands the pioneering brand will retain a competitive advantage. This is consistent with studies of the U.S. drug industry. Using Canadian data for the drug industry it is shown that eliminating quality differences is a necessary but not sufficient condition for late entrants to gain market share. In addition, price competition has to be stimulated. Under these conditions the late entrants have taken up to 100 percent of the pioneering brands market.     

Imports and domestic entry: an empirical study

The objectives of this study are twofold: (a) to investigate the influence of imports on domestic entrants and to see whether indeed imports have a deterring effect on potential entrants; and (b) to determine whether the common finding of a weakly negative, or even nonnegative, impact of imports on domestic firms' profitability can be attributed to imports' inhibiting effect on potential entrants. A reduction or removal of the threat of domestic entry enables existing firms to raise prices, therefore, this effect may partly counter the procompetitive, price reducing effect of imports on domestic oligopolistic markets.     

Product Hierarchy and Brand Strategy Influences on the Order of Entry Effect for Consumer Packaged Goods

Manufacturers focus on becoming more agile, software firms deploy rapid application development tools—everyone is in a hurry. Although we all understand the benefits of being first to market, we understand just as clearly that not all first-to-market products enjoy the same, sustainable benefits from being market pioneers. Why do some pioneering products experience a more significant order-of-entry effect than others? Roger A. Kerin, Gurumurthy Kalyanaram, and Daniel J. Howard examine two factors–product hierarchy and brand strategy—which may influence the magnitude of this effect for new consumer packaged goods. First, they hypothesize that pioneering a new product class offers a greater advantage than introducing a new form to an existing product class. Second, they predict that the order-of-entry effect will be greater for brand extensions than for entirely new brands. Finally, considering both product hierarchy and brand strategy, they expect that the order-of-entry advantage for brand extensions over new brands will be significantly greater within new product classes than for new forms of existing products. These hypotheses are tested using data from the Information Resources, Inc. Behaviorscan° data set. Collected from 2,500 household panel members, 75 supermarkets, and 25 drugstores, this database contains weekly measures of brand trial penetration as well as brand distribution, price, and promotion information in eight geographic markets from the period 1983–1988. The models developed in this study explore the relationships among brand trial penetration, product hierarchy, brand strategy, order of entry, lag time between successive brand entrants, and marketing mix variables (i.e., price, promotion, distribution, and advertising). The study strongly supports all three hypotheses. In particular, the analysis clearly demonstrates that the order-of-entry effect is greatest for a new product class pioneered by a brand extension. Order of entry has the least effect on a new product form pioneered by an entirely new brand. For a company seeking a competitive advantage from being first to market, innovation in product function offers greater potential benefit than innovation in product form. Such a company can also benefit from building on the name and reputation of its established brands. Although the study finds these order-of-entry effects significant, the effects of marketing mix variables such as product price and promotion are consistently stronger.     

Complementarities and competition: Unpacking the drivers of entrants' technology choices in the solar photovoltaic industry

Entrants in new industries pursue distinct technologies in hopes of winning the technology competition and achieving sustainable competitive advantage. We draw on the complementary assets framework to predict entrants' technology choices in an emerging industry. Evidence from the global solar photovoltaic industry supports our arguments that entrants are more likely to choose technologies with higher technical performance and for which key complementary assets are available in the ecosystem. However, diversifying entrants are more likely to trade off superior performance for complementary asset availability whereas start‐up entrants are more likely to trade off complementary asset availability for superior performance. This difference is largely due to diversifying entrants with pre‐entry capabilities related to the industry. The study offers a novel illustration of how complementarities and competition shape entry strategies. Copyright © 2013 John Wiley & Sons, Ltd.