A Conditional Role-Involved Purpose-Based Access Control Model

This paper presents a conditional role-involved purpose-based access control (CPAC) model, where users dynamically activate conditional roles in accordance with the context attributes. Based on conditional role, access permissions are assigned that represent what can be accessed for what purpose to roles under certain conditions. On the other hand, conditional purpose is applied along with allowed purpose and prohibited purpose in the model. It allows users using some data for certain purpose with conditions (for instance, Tony agrees that his income information can be used for marketing purposes by removing his name). The structure of a CPAC model is defined and investigated. Access purpose is verified in a dynamic behavior, based on user attributes, context attributes, and authorization policies. Intended purposes are dynamically associated with the requested data object during the access decision. An algorithm is developed to achieve the compliance computation between access purposes and intended purposes and is illustrated with role-based access control (RBAC). Access purpose authorization and authentication in the model are studied with the hierarchical purpose structure. The model separates authorization of access purpose from access decision that improves the flexibility of private data control.     

城市创新文化建设的国际比较分析

以东京、巴塞罗那和曼彻斯特三个典型的创新型城市为对象,从环境条件(可视层)、制度行为(制度层)和价值理念(精神层)三个层面对其城市创新文化建设进行了比较分析。得出对我国创新型城市创新文化建设的启示:从传统文化中汲取养分,倡导创新观念、营造创新氛围;规划文化发展,整合创新资源,培养、引进各类优秀人才;完善创新机制,激发创新活力。     

Exchange Rate Regime and Demand for Reserves: Evidence from Kenya,Mexico and Philippines

This paper empirically investigates the demand for international reserves (and foreign exchange reserves) during fixed and floating exchange rates periods in three developing countries: Kenya, Mexico and Philippines. Based on theoretical models, three factors are identified as important for the demand of international reserves and foreign reserves: average propensity to import, volume of imports and variability of reserves. The paper employs the cointegration methodology and error correction method to investigate the relationships. Cointegration tests results indicate a reliable long-run stationary relationship between the international reserves (and foreign exchange reserves) and the stated explanatory variables across countries and sub-periods of fixed and clean float. The error correction results indicate causality from the explanatory variables to the reserves during both the short and long run. This is true during both the fixed and the floating periods.

R-estimation of the parameters of a multiple regression model with measurement errors

We consider the theory of R-estimation of the regression parameters of a multiple regression models with measurement errors. Using the standard linear rank statistics, R-estimators are defined and their asymptotic properties are studied as robust alternatives to the least squares estimator. This paper fills the gap of the rank theory for the estimation of regression parameters with measurement error models. Some simulation results are presented to show the effectiveness of the R-estimators.     

Analysis of rural activity spaces and transport disadvantage using a multi-method approach

Current knowledge about the relationship between transport disadvantage and activity space size is limited to urban areas, and as a result, very little is known about this link in a rural context. In addition, although research has identified transport disadvantaged groups based on their size of activity space, these studies have, however, not empirically explained such differences and the result is often a poor identification of the problems facing disadvantaged groups. Research has shown that transport disadvantage varies over time. The static nature of analysis using the activity space concept in previous research studies has lacked the ability to identify transport disadvantage in time. Activity space is a dynamic concept; and therefore possesses a great potential in capturing temporal variations in behaviour and access opportunities. This research derives measures of the size and fullness of activity spaces for 157 individuals for weekdays, weekends, and for a week using weekly activity-travel diary data from three case study areas located in rural Northern Ireland. Four focus groups were also conducted in order to triangulate quantitative findings and to explain the differences between different socio-spatial groups. The findings of this research show that despite having a smaller sized activity space, individuals were not disadvantaged because they were able to access their required activities locally. Car-ownership was found to be an important life line in rural areas. Temporal disaggregation of the data reveals that this is true only on weekends due to a lack of public transport services. In addition, despite activity spaces being at a similar size, the fullness of activity spaces of low-income individuals was found to be significantly lower compared to their high-income counterparts. Focus group data shows that financial constraint, poor connections both between public transport services and between transport routes and opportunities forced individuals to participate in activities located along the main transport corridors.     

Shadow Banking Credit Intermediation： Determinants of Default Risks in Securitization and Collateralization

The growth in shadow banking system over the past few years is acknowledged as the key risk to Malaysia＇s financial stability. This is because that it is associated with growth in the household debts extended by the shadow banks. In line with initiatives by the Bank Negara Malaysia （the Central Bank of Malaysia） to enhance surveillance on the activities of the shadow banks in Malaysia, this study attempts to examine the determinants of default risks of shadow banks restricting to focus on their two main activities： securitization and collateralization. The results provide empirical evidence that future methodology to examine the systemic risks in the shadow banking system may need to account for additional explanatory variables that measure collateralized assets that are being intermediated.     

High level of education builds up strong relationship between organizational culture and organization performance in Pakistan

Organizational culture is an important aspect to be considered by dynamic organizations in order to develop some competitive advantage to ensure enhanced organizational performance. This study aims to elaborate the dimensions of cultural construct in organizations of diversified sectors and their implications in Pakistan. Ten organizations were selected for the study. Four hundred and seventy eight questionnaires were received from these organizations. The questionnaires consisted of three parts, of these, the first part had nine elements that were related to organization and personal profile of the respondents, whereas the second part consisted of 60 elements of cultural construct, namely mission, adaptability, consistency, and involvement. In the third part, dependent variable appears as organization performance and was evaluated by asking eight questions. Results are revealed in two models: according to the first model, organization performance increases from negative 56% to positive 92% due to organizational culture with respect to education. And the second model is also significant at the 95% of confidence level (p < 0.05), and there is a positive relationship between independent and dependent variables. Organizational culture is an essential part of organizational success. Core organizational values typically emphasize special themes such as performance excellence, innovation, social responsibility, worker involvement, and quality of work life. Literacy rate in Pakistan is far below the literacy rate in developed countries. Educated employees play an important role in enhancing organizational performance, particularly in corporate setup. To measure affects of education on organizational performance through its construct involvement, consistency, adaptability, and mission have been endeavored in this study.     

The tourism-led growth hypothesis: empirical evidence from Turkey

In the economic growth literature, the contribution of tourism to economic development has attracted great attention due to its significant roles as a source of foreign exchange earnings, creation of employment opportunities and an important source of public revenues in many countries. In this paper, we aim to analyse the empirical relationship between economic growth and tourism by employing different econometric techniques. First, we employed the Bound test approach developed by Pesaran, Shin, and Smith (2001, Bounds testing approaches to the analysis of level relationships. Journal of Applied Econometrics, 16(3), 289–326) in order to investigate the co-integration relationship between economic growth and tourism. Second, we used the Granger causality analysis for the 1998–2011 period and found evidence of a long-run uni-directional causality running from tourism to economic growth, but not vice versa. Our findings show that the Turkish case supports the tourism-led growth hypothesis (TLGH). Third, the autoregressive-distributed lag approach was employed in order to investigate the long-term and short-term static relationship between tourism and economic growth. The results show that tourism has a positive effect on gross domestic product and economic growth both in the long-term and short-term. Finally, the effect of tourism on economic growth was also investigated dynamically by employing the Kalman filter method. The findings of this method support the TLGH for Turkey.     

The Effect of Culture and Religiosity on Business Ethics: A Cross-cultural Comparison

This article examined the effect of culture and religiosity on perceptions of business ethics among students in a tertiary institution in Malaysia. A structured questionnaire was developed with scenarios on various aspects of business ethics, and self-administered to the students in the business studies program. The results from 767 respondents showed that there were significant differences among the Malays, Chinese, and Indian students on seven scenarios namely selling hazardous products, misleading instructions, selling defective products, padding expense account, taking sick to take a day off, keeping quiet on defective products, and respond to supplier’s take good care of clients attitude. There was also an association between culture and religiosity. The MANOVA results also showed that culture and religiosity have an effect on perceptions of business ethics.     

How well do conservation auctions perform in achieving landscape‐level outcomes? A comparison of auction formats and bid selection criteria

This paper studies the performance of auction design features regarding pricing mechanisms and bid selection criteria for securing wildlife zones across different holdings. We compare two pricing mechanisms: a discriminatory‐price auction and a uniform‐price ascending auction, and four bid selection criteria on the basis of: total bid, bid‐per‐value ratio, bid‐per‐area ratio and a mixed criterion where bids are formed on the basis of cost but they are selected based on the bid‐per‐value ratio. We develop a best‐response group‐bidding model for a discriminatory‐price auction where bidders form optimal group bids for individual wildlife zones. In the uniform‐price ascending auction, individual landholders respond to prices, which are successively raised by the auctioneer and whenever all the landholders from a single zone agree to participate (i.e. the first zone is formed), the auction stops. Based on numerical simulations using a bio‐economic model of malleefowl conservation, we observe that the discriminatory‐price auction is more cost‐effective than the uniform‐price ascending auction. However, the budgetary cost‐effectiveness of a discriminatory‐price auction is sensitive to bidder uncertainty about the number of competing bidder groups and the highest cost of establishing a wildlife zone among these groups. In terms of bid selection, the mixed bid selection criterion performs best. We discuss the policy implications of these findings.