Due to the growing interest in electronic commerce, more and more transactions now happen online. Thus, fair transactions between customers and merchants are getting important. To gain the fairness of the exchange of digital items, fair exchange protocols have been proposed and well studied. Most of the traditional fair exchange protocols are concerned about the exchange of digital items, such as digital signatures, contracts, and documents. Recently, researchers pay attention to the exchange of digital goods along with electronic cash, and have proposed some fair transaction protocols based on electronic cash. To buy digital contents via electronic cash through network, the anonymity property as traditional cash possesses must be guaranteed. It means that the payment information of the customer cannot be revealed to anyone else including the trusted third party (TTP) who helps the customer and the merchant with resolving possible disputes in the protocol. Since the customer and the merchant may not trust each other in an electronic transaction. In a fair exchange protocol, a TTP is employed to achieve true fairness. An on-line TTP has to take part in all transactions while they are proceeding. Despite it can gain true fairness, it is inefficient due to on-line interaction with the TTP. On the other hand, an off-line TTP does not need to join in the transaction protocol in normal cases. Instead, it participates in the protocol only when disputes happen. It is efficient and fair, and more feasible in practical situations. In this thesis, we propose a fair transaction protocol based on electronic cash. With the extended research on electronic cash, we have designed a fair transaction protocol that is suitable for any electronic cash system. By using an off-line TTP, the protocol is more efficient and practical. Furthermore, payment information of the customer cannot be known to anyone else including the TTP, and thus, the anonymity of the customer is protected completely in our protocol.

Mobile network equipments are widely popularized and advanced mobile communication services are provided increasingly such that ubiquitous computing environments will come true soon. It is a pleasure for mobile users to work or get recreations in the mobile network environments. However, just as the cases in wireline environments, there are a lot of security threats to mobile network systems and their impact on the security is more serious than that in wireline environments owing to the feature of wireless transmissions and the ubiquity property in mobile network systems. The secret personal information, important data, or classified missives which mobile users carry may be stolen by malicious entities. In order to guarantee the quality of the advanced communication services, the security and privacy would be the important issues when mobile users roam to the mobile networks. In this thesis, an anonymous authentication protocol will be proposed to protect both the security of the mobile network system and the privacy of mobile users. Not only does the proposed scheme provide mutual authentication between each user and the system, but also the identity of each user can be kept secret against anyone else including the system. Although the users are anonymously authenticated by the system, it can still make correct bills to charge these anonymous users. Finally, our protocol also achieves the goal of fair privacy which allows the judge to be able to revoke the anonymity and trace the illegal users when they misused the anonymity property such as they committed crimes.

A European option is a contract in which the seller of the option grants the buyer the right, but not the obligation, to purchase from or sell to the seller the underlying asset at pre-specified price at maturity date. Herewith the buyer should pay out a premium for the value of flexibility that he was granted. Such premium as the compensation to the seller was provides in close form by Black and Scholes (1973) and Merton (1973). Even since then the option pricing methodology, or otherwise known as ¡§contingent claim analysis¡¨ has found its application in many prospects. Otherwise known as the real option analysis first induced by Myers (1977) and the structure form model of the credit risk analysis first induced by Merton (1974). In the thesis, we consider the application of the optional pricing methodology to the rationality and valuation of penalty in a contract and extent the penalty to the money back guarantee. In the former, we provide the general form solution to illustrate the both parties all hold the right to default the contract, and prove the existence of the optimal penalty is a policy to protect the disadvantaged minority such as to make the trade contract to be fair. In the latter, we prove the suitable way to evaluate that the consumer buy a good and long a MBG is the call option but the put by reviewing the final cash flow of the replicated strategy and the put-call parity at firstly, and then we find out the better way to grant the consumer to return the good to the vendor is penalty if the good is normal and the utility function of the consumer is concave. In sum, we integrate the penalty and in the MBG with the contingent claim analysis in this thesis, we find out we can use the uncomplicated model to explain the real world. Herewith we consider the option pricing model as another methodology to illustrate the social environment.

Thesis (PhD.) -- University of Canberra, 2007. / Includes bibliography (p. 225 - 240)

Thesis (doctoral)--Universität St. Gallen, 2002.

Since the mid-2000s, the production of the pseudo-cereal quinoa (Chenopodium quinoa) for export has increased due to growing demand in the United States and Europe. To meet demand, many of those living in the Bolivian high plateau or altiplano have transitioned from traditional livelihood strategies to commercial quinoa production oriented at the international export market. The following looks at how Bolivians living in the community of Pampa Aullagas have adapted to commercial production by looking at three vignettes of different actors living in the community. Looking at traditional agropastoralists, teachers, and modern producers, this thesis seeks to understand the nuances and complexities associated with integration into the global export market. / text

The city of Austin in recent years has undertaken a number of planning initiatives to guide future development in the rapidly-growing urban area. What has emerged is a clear commitment to a broad definition of sustainability that includes environmental, economic, and social sustainability among both policy makers and the public. The city of Austin has made great strides towards its goal of becoming a model city for sustainability, but it still faces many challenges. The long-term sustainability of Texas construction jobs is threatened by declining wages, dangerous working conditions, and few employment-based benefits. To help address these challenges, the Workers Defense Project (WDP), a local community-based organization dedicated to improving working conditions for Austin’s low-wage workers, has partnered with industry and community stakeholders to create the Premier Community Builders (PCB) certification program. Certification programs, which require businesses to meet minimum set of standards in exchange for a seal or trademark that publicizes their commitment to corporate social responsibility, have become a popular tool in recent years for improving conditions in a variety of industries. Implementing a certification program, however, often drives up costs associated with adopting more sustainable practices and is highly dependent upon consumers’ willingness to pay a price premium for the certified product. The purpose of this research is to explore consumer willingness to pay among downtown Austin residents and tourists for PCB certification. This exploratory study utilizes a contingent valuation survey as the primary instrument to determine whether or not downtown Austin consumers are willing to pay more for PCB certified construction and identify any demographic or identity-related factors associated with downtown consumers’ willingness to pay for PCB certification. / text

When the Fair Housing Act of 1968 was passed 47 years ago, the United States was in the midst of the civil rights movement and fair housing was identified as a pillar of equality. While, progress has been made, there is much work that needs to be done in order to achieve integration. As a country, the United States is a highly segregated country. It is important to understand the factors that contribute to this and it is important to understand the relationships that exists between them in order to attempt to solve the problem. While the legal barriers to integration have been lifted choices continue to be limited to families of color that lack the resources to live in desirable neighborhoods. The ultimate goal of this study is to examine the relationship between the impact of individual indicators and housing patterns in the greater Tucson/Pima county region. An affordability index, the DEYA index, was created to determine where affordability is at its highest. The index includes different weights for foreclosure, Pima County spending on affordable housing, the existence of Pima County general obligations bond affordable housing projects, land value and inclusion in the community land trust. Once this was determined a regression analysis was used to determine the relationship between affordability and individual factors that may be affecting integration. The indicators used were broken down into 3 categories: the categories were education, housing and neighborhoods and employment and economic health.

The essays included in this dissertation develop a fair play account of state legitimacy. I argue for a modest revision to the traditional analysis of legitimacy. I then defend the principle of fair play against common objections. Next, I argue that the principle of fair play is capable of generating all the rights included in the new analysis of legitimacy defended earlier. Finally, I argue that the principle of fair play grounds the legitimacy of existing reasonably just states.

I examine the information content of unrealized cash flow hedge gains/losses for future profitability and stock returns. An unrealized gain on a cash flow hedge suggests that the price of the underlying hedged item (i.e. commodity price, foreign currency exchange rate or interest rate) moved in a direction that negatively affects the firm. Based on this inverse relation, I find that unrealized cash flow hedge gains/losses are negatively associated with future gross margin. This association is weaker for firms that have the ability to pass input price changes through to customers. Finally, I find that investors do not immediately price the information conveyed by cash flow hedges. Instead, investors appear surprised by future realizations of gross margin, consistent with the view that a lack of transparent disclosure on future hedged transactions leads to a delay in pricing. These results may inform current policy decisions of both the FASB and SEC.