一种并行传输的时频域扩频多载波DS-CDMA系统性能分析

提出了一种并行传输的时频域扩频多载波DS-CDMA系统,它先将传输数据进行串并转 换而后经过时域和频域两次扩频。在不改变传输数据速率和扩频增益的情况下,并行传输可 以增大符号时间和降低码片速率,从而提高信号的抗频率选择性衰落的能力和实现低速率信 号处理。采用码片匹配滤波的方式对信号进行接收,分析了高斯信道下的单用户检测性能并 推导了误比特率表达式。研究表明,在此系统中串并转换比与码片速率的降低和子载波个 数成正比,而与误比特率无关;不存在比特间干扰;多用户干扰只存在于同一子载波传输的 不同用户的数据比特之间,且可通过采用正交时域扩频码来消除;误比特率随用户数量的增 加而增加,而随每比特信噪比和扩频增益的增加而降低;在带宽受限的情况下,可通过合理 设置串并装换比、时域和频域扩频增益参数来简化系统实现,满足误比特率的性能需求。     

Financial crises and contagion vulnerability of MENA stock markets

This paper examines contagion vulnerability and the international and regional financial linkages of the MENA stock markets. The degree of vulnerability of those markets to global and regional financial crises will have important bearings on the respective economies' growth rate, and on their ability to diversify international and regional portfolios. Granger causality tests and impulse response functions reveal that while the GCC equity markets still offer international investors portfolio diversification potentials, those markets are relatively less vulnerable to global and regional financial crises. Moreover, even though the remaining MENA stock markets of Egypt, Morocco, and Tunisia have matured and are now financially integrated with the world stock markets, they tend to exhibit more vulnerability to regional and international financial crises. Their vulnerability to international financial crises is due, on the one hand, to weak regional integration, and to greater economic and financial integration with the more advanced economies on the other.     

Antecedents of patent value using exchange option models: Evidence from a panel data analysis

This paper examines the patent impact factor by an empirical study using panel data. To investigate the impact factor of patent value, this study conducts a sensitivity analysis of a patent evaluation model within the framework of a real option, while considering the uncertainties associated with both patent counts and the amount of R&D per patent, and develops an empirical analysis method for examining the impact factor of a patent using an unbalanced two-way fixed effects model. The empirical results indicate that the increase of patent value accords with the increase in the patent counts, volatility and patent lifetime. Although patent value declines with the amount of R&D per patent, the impact is not significant. However, reducing cost, raising patent counts and enhancing innovation efficiency offer a feasible method for a firm to increase patent value.     

Board-management relations in small firms: The paradox of simultaneous independence and interdependence

The author introduces constructs based on neo-classical and socio-economic assumptions, and argues that board-management relations should be characterized by both independence and interdependence. Interdependence is especially important in small firms. The article presents a model of directorates from research about directorates based on agency theory assumptions. This model is supplemented with constructs from the theory of contractual relations. Whilst traditional literature tends to focus upon independence from an agency theory perspective, this article argues that it is necessary to use more than one dimension of attributes regarding the board-management relations in order to understand the board's contribution to company performance, and that trust and solidarity is especially important in small firms. Board-management relations described by simultaneous independence and interdependence are proposed to give the highest contribution to company performance. The theoretical propositions are exemplified and supported by results of a field survey of directorates in small firms.     

Time and frequency domain causality Testing: The causal linkage between FDI and economic risk for the case of Turkey

This study aims to explore the causal relationship between economic risk and foreign direct investment (FDI) inflows for the case of Turkey. With the aim of establishing robust findings for the research in mind, both traditional and modern causality techniques are utilized; time domain Granger (1969, “Investigating Causal Relations by Econometric Models and Cross-Spectral Methods.” Econometrica 37: 424–438.), Toda and Yamamoto (1995, “Statistical Inference in Vector Autoregressions with Possibly Integrated Processes.” Journal of Econometrics 66 (1–2): 225–250.), Fourier Toda-Yamamoto and frequency domain Breitung and Candelon (2006, “Testing for short- and long-run causality: A frequency-domain approach.” Journal of Econometrics 132 (2): 363–378.) spectral causality test. Our empirical findings reveal that; economic risk changes in Turkey significantly lead to changes in FDI inflows. However, there is no evidence of causality running from FDI to economic risk. The findings imply that economic risk is an essential determinant of FDI inflows in Turkey. Our findings are compatible with historical macroeconomic developments in Turkey and imply important policy implications. The results of this study can be generalized for other emerging economies that have similar macroeconomic environments, in order to create useful policy implications regarding FDI inflow.     

Towards a conceptual multilayered framework of international entrepreneurship

The starting question before us here is: how should we approach complex international entrepreneurship decisions and problems? This article aims to trace the evolutionary scholarly road that has brought us here and highlight some of the significant signals, road signs, milestones, and barriers along the way. We will pause at each milestone to view the scenery surrounding it and also examine the underlying structures there, especially those that have served as foundations for the evolutionary course that usually starts at a local origin, passing through milestones, for reaching global destinations; as well as examining the nature of the evolution that has brought us to the current state of affairs. In light of multidisciplinary nature of international entrepreneurship (IE), drawing and relying on a few disciplines, there is a need to abstract from some in favor of deeper discussion of others with more prominent impact and presence in IE. We aspire to portray the outline of a multilayered conceptual framework to serve two primary purposes: to suggest a promising path for further theoretical developments and to provide a roadway to allow us to travel through to farther theoretical and operational destinations; and to highlight the articles appearing in this issue. We will view each article as a milestone and examine how the selective features of the article confirm, if not support, the framework enabling us to push forward to see farther horizons. Structurally, this article starts with a brief introduction that travels through three theoretical and foundational stops on the way to develop a broader view of IE at the end. A proposed conceptual framework will project, and enable us to see, that broader view. The latter part of the article travels through the four articles to highlight their theoretical developments and empirical findings that lend support to pertinent aspect of the proposed framework. A brief discussion at the end explore selected implications.     

Financial contagion in East Asia and the origins of the economic and financial crisis in Korea

In this article the major elements of the 30 year old Asian development model are examined in the light of the financial crisis in the region. The notion of a common model is examined and found to be overstated. The monetary crisis in Asia has affected countries to different degrees, with Indonesia and Korea being particularly weakened. Korea has two major economic problems which can be traced to economic policies established in the 1960s. First, the industrial organization of the economy under a few industrial conglomerates, which has outlived its usefulness and is now a major source of the troubles in the economy. The conglomerates have been responsible for an investment policy where risk has been pushed to recklessness and the rate of return on capital employed is meagre. Second, banking policy, which is best characterized as a severe form of ‘moral hazard’. Both of these policies, while having played major parts in past economic successes, are now the main cause of a weakened economy in a globalized world.     

Value of digital information networks: a holonic framework

The worldwide extraordinary level of interest in digital information networks’ deployment among nations is due to the strong perception that they bring economic, social and environmental value. Our literature review on studies aiming at clarifying the value of information networks, led us to conclude that these studies take speculative, elusive or limited conclusions. We identify the requirements to capture the value of information networks and indicate a possible theoretical ground to account for it. Based upon this, we propose a framework operationalized with data from Eurostat. Furthermore, we identify the added-value of our framework with a precise and comprehensive comparison with two state of the art reference frameworks. We demonstrate that our framework provides significant conceptual added-value and, more fundamentally, allows for traditional measures of economic value (e.g. productivity and growth), as well as for other measures of value (e.g. social and environmental). Finally, we demonstrate with examples the wider application range of our framework in comparison with existing work.     

Trade interdependence, the international financial institutions, and the recent evolution of sovereign-debt renegotiations

This paper analyzes the effect of a debtor country’s pattern of trade with commercial creditors’ home countries on the outcome of debt-rescheduling negotiations. The analysis reveals that a debtor country with more market power has greater leverage in a three-way debt-rescheduling negotiation that includes the debtor country, its creditors and the International Financial Institutions (IFIs). The paper also considers the effects of the IFI sovereign-debt policy on the bargaining power of the parties in debt-rescheduling negotiations. Two bargaining frameworks analyzed and compared in the paper represent the negotiation mechanism at different stages of the IFI sovereign-debt policy evolution.     

Digital transformation in maritime ports: analysis and a game theoretic framework

Digitalization is pushing the maritime industry beyond its traditional limits and provides many new opportunities to enhance the productivity, efficiency, and sustainability of logistics. The concept of smart ports, for instance, aims to adopt modern information technologies to enable a better planning and management within and between ports. Strong facilitators of the digitalization are investments into technology and cooperations for promoting information sharing and a better coordination and collaboration, often regarded as a stumbling block in highly competitive environments. Besides many new opportunities, important economic issues and problems arise. We provide an overview of the development and state-of-the-art of digital transformation in modern seaports in order to identify current potentials and barriers. Focusing on the crucial and challenging aspects of coordination and collaboration, we present a conceptual game theoretic framework that allows benefits and cost allocations considering inter-, intra-, and meta-organizational perspectives. We further demonstrate how this framework can be used to develop tools and methods for supporting strategic decision making for driving the digital transformation in seaports and addressing new economic issues and problems.     

Micro-foundational ambidexterity and multinational enterprises: A systematic review and a conceptual framework

During the past decade, ambidexterity research has broadened from its traditional macro-level focus to examine the micro-level perspectives of ambidexterity on various settings. The authors systematically review and critically appraise the literature of ambidexterity from a micro-foundational perspective, within the context of Multinational Enterprises (MNEs). By synthesizing the review findings, the authors develop a comprehensive framework that maps extant literature within and across various disciplines and multiple levels of analysis. As part of their review, the authors also identify and discuss important emerging themes and fruitful areas for future research and present the implications to both research and management practice.     

Determinants of intra-firm trade: A search for a theoretical framework

This article establishes a theoretical framework to explain the underlying conditions for intra-firm trade phenomenon. Despite an increasing importance of intra-firm trade as a new mode of international exchange, its nature and implications have not yet been investigated seriously and appropriately. Traditional explanation of international trade offers little help in understanding this new phenomenon of international exchange. Using the transaction cost paradigm and its international application as well as the eclectic model of international production, this study identifies major determinants of the intra-firm trade. Also presented are some testable hypotheses within the theoretical framework thus developed.     

The current and future sales impact of a retail frequency reward program

This research presents an empirical study of the impact of a retail frequency reward program on store sales. We examine both the “points pressure,” or short-term impact, and the “rewarded behavior,” or long-term impact. The points-pressure impact is due to forward-looking customers increasing their purchase levels in order to earn the reward. The rewarded-behavior impact is evidenced as purchases above baseline levels after an individual has received a reward and could result from either behavioral learning reinforcement or positive affect resulting from the reward. We investigate a turkey reward program that awarded free turkeys to shoppers who accumulated the required sales levels during an 8-week period. We find both a points-pressure and rewarded-behavior impact. These effects are statistically significant and managerially relevant in that the program is apparently profitable. The points-pressure impact is especially strong among customers who do not place value on frequent shopper programs that in general deliver immediate price discounts. The key implications are that frequency reward programs of the form, “buy x, then receive xx” can be profitable, are segmentation strategies, and can complement a store's overall frequent shopper program.     

Development and validation of a locus of control scale for the entrepreneurship domain

Locus of control has been extensively examined in entrepreneurship research, but with mixed results. This may be due to measurement issues, such as the widespread use of Rotter??s (1966) general locus of control scale, which is not domain specific. Not surprisingly, Rotter??s scale has been shown to be multidimensional, including personal efficacy. When the first Panel Study of Entrepreneurial Dynamics (PSED I) was constructed in the late 1990s, a measure of locus of control was included. Unfortunately, this scale was also multidimensional. Thus, measurement of the construct may be problematic. Because locus of control continues to be important in organizational research, where it has been found to influence intentions, motivation, satisfaction, and performance, we examined the PSED I dataset to determine whether we could develop a more robust measure after the fact. To this end, we constructed a unidimensional locus of control scale using the sample of nascent entrepreneurs in the PSED I dataset and validated the scale using two additional samples.     

Partial Utilitarianism as a suggested ethical framework for evaluating corporate mergers and acquisitions

Prior literature on ethical concerns in mergers and acquisitions (M&As) has often concluded that many stakeholders, such as workers and communities, have unjustly suffered as a result of takeovers and associated defences and that their rights as stakeholders have been violated. However, very few papers provide any guidance on how to evaluate a merger or acquisition from an ethical standpoint. This study looks at how ethical frameworks could be used to assess the ethical impact of a merger or acquisition and gives practical guidance. It is proposed that decision makers should consider the impact on four stakeholder groups: shareholders, employees, customers and directors. We call the proposed method for doing this Partial Utilitarian analysis. We suggest two possible ways of applying the Partial Utilitarian analysis. One approach could rely on the evidence from a sample of recent deals. For this, empirical analysis is conducted on a sample of large M&As in the United Kingdom in the period 1993–2003. Alternatively, a better approach, requiring considerable management time, requires forecasting of the economic impact on the four groups of stakeholders. The paper shows how to do this.     

一起变频电机DCS显示故障分析与处理

本文针对ABB ACS800变频器(以下统称变频器)模拟信号的输入、输出特点,结合实际接线方式对一起DCS无法正确显示变频电机运行速度的故障进行分析与探讨,为生产过程中处理此类故障提供一些思路,确保及时恢复生产,达到设备的平稳运行.     

Exploring the animosity domain and the role of affect in a cross-national context

PurposeThe purpose of this paper is to contribute to the development of animosity theory in three areas; construct domain, the mediating role of affect and model testing.Design/methodology/approachExploratory and empirical research is carried out in two countries in order to explore the domain and to test the factor structure and the hypotheses through confirmatory analysis.FindingsWe find animosity is a four-dimensional construct which impacts buying behavior through affect.Originality/valueThe research extends the domain of the animosity construct to a four-dimensional structure rather than the two-dimensional structure used in most previous studies. It is the first study to empirically test an extended animosity domain and investigate the mediating role of affective emotional responses between animosity and buying intentions.     

Profit-Sharing in OECD Countries: a Review and Some Evidence

This article starts by describing the extent of profit-sharing schemes in OECD countries. It suggests that firms have increasingly introduced profit-sharing schemes not only because of the tax breaks they involve, but also because of accumulating information on the link between profit-sharing and productivity. It concludes with a summary of new research among UK manufacturing companies, which shows a productivity improvement of about 6% in cases where profit-sharing bonuses were of order 5–10% of market wages.     

MNCs and linkages creation: Evidence from a peripheral area

MNCs’ spillovers occur in the local economy through linkages creation, but little it is known so far on the factors affecting the creation of some linkages rather than others by foreign investors. Adopting as a spatial unit of analysis a peripheral sub-national sub-regional area so far little examined by current IB developmental literature, this study investigates how foreign subsidiaries’ local market strategy and organizational structure impact on local linkages creation. Given the number of features shared by the peripheral sub-national sub-regional area under analysis with less developed economies, broader policy implications are drawn for local economic development in less developed countries. Using original survey data, we find that linkages creation is greater when foreign investors entertain market rival relationships with other foreign units and have a competence-creating scope within the corporate organizational structure. The phenomenon also occurs, although to a lesser extent, when foreign investors with a competence-exploiting scope do not compete with other foreign units. Conversely, no linkages are established by rival competence-exploiting subsidiaries.     

Institutional framework and capital structure of microfinance institutions

This article addresses the question of whether institutional frameworks matter in the capital structure of microfinance institutions. We studied a sample of 292 MFIs between 2004 and 2009. Our findings suggest that creditor rights, a country's legal tradition, and the level of financial sector development are significantly related to MFIs' level of external finance. Furthermore, the positive relationship between banking sector development and borrowings enables us to conclude that the microfinance sector and the formal banking sector are complementary. In addition, a split sample technique is used in order to assess the external validity of the model. Findings from this cross-validation strengthen the results obtained from the whole sample and indicate that our model seems to predict well the effect of institutional variables on the capital structure of MFIs.