Zugl.: Siegen, Univ., Diss., 2008

Under the public-private partnership (PPP) programme, private sector finance, management expertise and innovation are used in ‘partnership’ to modernize public services. However, advocates fail to account for the differing aims and responsibilities of the public and private sectors, in that private companies plan to make a profit out of non-profit public sector organizations. There is a paucity of critical empirical research into new ‘partnership’ forms of privatization and the implications that these have for employment and work. This article will examine the PPP of National Savings and Investments (NS&I) and some of the initiatives introduced and problems encountered, which resulted in the creation of a multi-tier workforce, together with the insourcing, outsourcing and the first ever offshoring of UK Government work to India.

This dissertation is an empirical study of the political benefits of decentralization. It examines the effects of decentralization on citizens’ evaluations of the political system. Despite the large number of empirical studies on the costs and benefits of decentralization, most studies focus on economic benefits (typically in terms of fiscal efficiency) and pay little attention to potential political benefits. This dissertation seeks to fill these gaps by explicitly modeling the role decentralization plays in shaping citizens’ attitudes toward a political system. Drawing on work in political behavior and decentralization, a theoretical framework is developed to explain the manner in which citizens’ attitudes are shaped by election outcomes and their post-electoral win-loss status in multi-tier government. This dissertation not only offers a general argument with which to understand how a decentralized political structure may lead to greater stability in a democratic regime, but also offers guidance to policymakers on whether decentralization should be pursued as an option for institutional reform.

Universiẗat, Diss., 2006--Karlsruhe.

abstract: The dissertation aims to provide a new perspective on the management of multi-tier supply chains. When a firm decides to buy a product from a supplier, the buying firm also needs to decide whether to use the supplier to make the lower-tier sourcing decisions or to make those decisions in-house. I call the former "supply chain-buy" and the latter "supply chain-make." If the choice is supply chain-buy, the buying firm releases sourcing control of its bill of materials (BOM) to the top-tier supplier and this supplier, then engages with the supply base to determine the BOM's supply chain. If the choice is supply chain-make, the buying firm maintains sourcing control of the BOM and engages with its own supply base to select the lower-tier suppliers. The dissertation provides a theoretical foundation and empirical observations for understanding the supply chain make-buy decisions. The dissertation consists of three main chapters: Chapter 2 extends the make-or-buy literature into the multi-tier supply management context to provide theoretical reasons for engaging in supply chain-make as opposed to supply chain-buy. Building on transaction cost economics, the knowledge-based view, and structural hole theory, Chapter 2 explains the phenomenon that cannot be fully explained by a single-theoretic perspective. Chapter 3 empirically investigates the economic and behavioral factors that influence individual purchasing managers' supply chain make-buy decision-making. Specifically, the roles of behavioral uncertainty, interpersonal trust, and familiarity are considered. A scenario-based behavioral experiment involving the members of the Institute for Supply Management is employed. Lastly, Chapter 4 studies the performance implications of particular supply network structures influenced by supply chain make-buy decisions. Supply chain make-buy decisions can affect the prevalence of structural holes in supply networks. Chapter 4 investigates the different types of structural holes in supply networks. It provides a novel way of understanding structural holes in the supply network context by distinguishing structural holes between the focal firm's suppliers (horizontal structural holes) from those between its customers and suppliers (vertical structural holes). Panel data on supply networks and firm financial indicators are used for analysis in Chapter 4. / Dissertation/Thesis / Doctoral Dissertation Business Administration 2017

In the last decade, the landscape of storage hardware and software has changed considerably. Storage hardware has diversified from hard disk drives and solid state drives to include persistent memory (PMEM) devices such as phase change memory (PCM) and Flash-backed DRAM. On the software side, the increasing adoption of cloud services for building and deploying consumer and enterprise applications is driving the use of cloud storage services. Cloud providers have responded by providing a plethora of choices of storage services, each of which have unique performance characteristics and pricing. We argue this variety represents an opportunity for modern storage systems, and it can be leveraged to improve operational costs of the systems. We propose that storage tiering is an effective technique for balancing operational or de- ployment costs and performance in such modern storage systems. We demonstrate this via three key techniques. First, THMCache, which leverages tiering to conserve the lifetime of PMEM devices, hence saving hardware upgrade costs. Second, CAST, which leverages tiering between multiple types of cloud storage to deliver higher utility (i.e. performance per unit of cost) for cloud tenants. Third, we propose a dynamic pricing scheme for cloud storage services, which leverages tiering to increase the cloud provider's profit or offset their management costs. / Master of Science

Recently, there has been a massive growth in the number of mobile users and their traffic. The data traffic volume almost doubles every year. Mobile users are currently running multiple applications that require higher bandwidth which makes users so limited to the service providers' resources. Increasing the utilization of the existing spectrum can significantly improve network capacity, data rates and user experience. Spectrum sharing enables wireless systems to harvest under-utilized swathes of spectrum, which would vastly increase the efficiency of spectrum usage. Making more spectrum available can provide significant gain in mobile broadband capacity only if those resources can be aggregated efficiently with the existing commercial mobile system resources. Carrier aggregation (CA) is one of the most distinct features of 4G systems including Long Term Evolution Advanced (LTE-Advanced). In this dissertation, a resource allocation with carrier aggregation framework is proposed to allocate multiple carriers resources optimally among users with elastic and inelastic traffic in cellular networks. We use utility proportional fairness allocation policy, where the fairness among users is in utility percentage of the application running on the user equipment (UE). A resource allocation (RA) with CA is proposed to allocate single or multiple carriers resources optimally among users subscribing for mobile services. Each user is guaranteed a minimum quality of service (QoS) that varies based on the user's application type. In addition, a resource allocation with user discrimination framework is proposed to allocate single or multiple carriers resources among users running multiple applications. Furthermore, an application-aware resource block (RB) scheduling with CA is proposed to assign RBs of multiple component carriers to users' applications based on a utility proportional fairness scheduling policy. We believe that secure spectrum auctions can revolutionize the spectrum utilization of cellular networks and satisfy the ever increasing demand for resources. Therefore, a framework for multi-tier dynamic spectrum sharing system is proposed to provide an efficient sharing of spectrum with commercial wireless system providers (WSPs) with an emphasis on federal spectrum sharing. The proposed spectrum sharing system (SSS) provides an efficient usage of spectrum resources, manages intra-WSP and inter-WSP interference and provides essential level of security, privacy, and obfuscation to enable the most efficient and reliable usage of the shared spectrum. It features an intermediate spectrum auctioneer responsible for allocating resources to commercial WSPs' base stations (BS)s by running secure spectrum auctions. In order to insure truthfulness in the proposed spectrum auction, an optimal bidding mechanism is proposed to enable BSs (bidders) to determine their true bidding values. We also present a resource allocation based on CA approach to determine the BS's optimal aggregated rate allocated to each UE from both the BS's permanent resources and winning auctioned spectrum resources. / Ph. D.

Multi-tier cellular networks have led to a paradigm shift in the deployment of base stations (BSs) where macrocell BSs are overlaid with smaller and lower power BSs such as microcells, picocells, and femtocells. Stochastic geometry has been proven to be an effective tool to capture such heterogeneity and uncertainties in deployment of cellular BSs. In stochastic geometry, random spatial models are used to model multi-tier cellular networks where the locations of BSs is each tier is assumed to be drawn from a point process with the appropriate spatial density. This thesis proposes stochastic geometry-based approaches to analyze, model, and optimize multi-tier cellular networks under several setups and technologies. First, I propose a novel location-aware cross-tier cooperation scheme that aim at improving the performance of users with low signal-to-interference-plus-noise ratio (SINR). Second, I study the performance of cognitive device-to-device (D2D) communication in multi-channel downlink-uplink cellular network with energy harvesting. For the coexistence between cellular and D2D transmissions, I propose a spectrum access policy for cellular BSs to avoid using D2D channels when possible. Third, I investigate the feasibility of energy harvesting from ambient RF interference in multi-tier uplink cellular networks. For this setup, I capture randomness in the network topology and the battery dynamics. Fourth, I extend multi-tier uplink cellular networks to consider the case when users do not necessarily associate with the nearest BS (i.e., flexible cell association). Finally, I compare between different cell association criteria including coupled and decoupled cell association for uplink and downlink transmissions in multi-tier full-duplex cellular networks. For all network setups, I use stochastic geometry to derive simple and closed-form expressions to evaluate the performance in terms of several metrics, e.g., outage probability, mean rate, transmission probability, success probability, and load per BS. I also highlight main tradeoffs in different networks and provide guidelines to optimize different performance metrics by carefully tuning fundamental network design parameters. / February 2017

Motivation: Previous research has shown that the focal firm’s supply chain leadership styles could have an impact on the outcome of green supply chain management. However, previous studies of focal firms, such as multinational corporations, have shown that many govern their supply chains through an indirect approach, which needs further research due to the lack of research in the combination of different supply chain leadership and followership styles. Previous research has also indicated that little research has been done on barriers to green supply chain management from the supplier's perspective, especially concerning the followership style and governance mechanism. The context of the study is in the electric-automotive industry, and more specifically, on an original equipment manufacturer's multi-tier supply chain, where the increased use of printed circuit boards has shown to have a tremendous negative impact on the climate. Purpose: The study set out to investigate how supply chain leaders and followers, together with their respective styles and governance mechanisms, are cascading green sustainability throughout the printed circuit board’s multi-tier supply chain. An additional purpose is to find out the barriers to green supply chains from the suppliers’ perspective. Methodology: The study takes a qualitative approach with a single case study design. Further, the different members in the OEM's multi-tier supply chain were interviewed with a semi-structured interviewing method, and respondents were found by a snowballing technique. Finally, the interviews were recorded, transcribed, and then coded and thematized in NVivo. Findings: Interesting findings showed that all supply chain members used an indirect approach as the governance mechanism, which led to the suppliers simultaneously assuming both a leadership role and a followership role. Further, contrasting to previous research was that all the closest tier one suppliers assumed an opposite followership style than the OEM’s leadership style; however, what partly confirms previous research is that the supplier’s leadership style was the same as the OEM. In addition, interesting behavior from the tier two suppliers showed that they assumed a different leadership and followership style than the tier one, which was discussed as a potential reason that the tier one suppliers have lesser influence than the OEMs. Lastly, several barriers to reaching green supply chains were discovered. One of the most problematic was the transparency barrier, which complicated collaboration further down the multi-tier supply chain. Another finding indicated that the use of third-parties could harm the motivation of the followers.

Uppsatsens syfte är att förstå hur den Europeiska kommissionen och Europaparlamentet diskuterar differentierad integration. Metoden som används är en kvalitativ textanalys där teorier om europeisk integration från forskningsområdet internationella relationer används som analysverktyg. En slutsats som dras är att teorierna om neofunktionalism och liberal intergovernmentalism kan komplettera varandra för att ge en mer mångsidig förståelse av de något olika diskussionerna. Den Europeiska kommissionen och Europaparlamentet vill i de tolkade dokumenten främst bibehålla en enhetlig union, men de är villiga att ge frihet till ambitiösa medlemsstater inom särskilda policyområden genom inkluderande opt in-lösningar av differentierad integration. Den Europeiska kommissionen och Europaparlamentet är motståndare till exkluderande opt out-lösningar av differentierad integration, de menar att exkluderande former av differentiering exempelvis skulle kunna leda till polarisering, fragmentering och ett upplevt skapande av ett första- och andraklassens EU-medlemskap. Gradvist tillträde är därmed historiskt sett som en sämre lösning till problemet kring kandidatländers integration, om gradvist tillträde skulle implementeras i integrationsprocessen för framtida kandidatländer skulle det därmed innebära ett trendbrott inom utvidgningspolicyn från den Europeiska unionen. / The thesis’ purpose is to understand how the European Commission and the European Parliament discusses differentiated integration. The method applied is a qualitative text analysis in which theories of European integration from the research field of international relations is used as an analytical tool. One conclusion recognises the fact that both the theory of neofunctionalism and liberal intergovernmentalism are complementary tools in understanding the discussions from a multitude of perspectives. The European Commission and the European Parliament expressed in the analysed documents that uniform integration within the Union is preferred, but they are still open to giving freedom to Member States in specific policy areas through inclusionary opt-in measures of differentiated integration. The European Commission and European Parliament are opposed to exclusionary opt-out measures of differentiation, as they mean it could lead to polarisation, fragmentation, and the perceived notion of first- and second-class Member States. Staged accession is therefore historically seen as a poor solution to the problem of integrating the candidate countries, if staged accession would be implemented into the integration process for future candidate countries, it would therefore mark a change in trend within the enlargement policy of the European Union.