Conceptual design methodology for blended wing body aircraft

The desire to create an environmentally friendly aircraft that is aerodynamically efficient and capable of conveying large number of passengers over long ranges at reduced direct operating cost led aircraft designers to develop the Blended Wing Body(BWB) aircraft concept. The BWB aircraft represents a paradigm shift in the design of aircraft. The design offers immense aerodynamics and environmental benefits and is suitable for the integration of advanced systems and concepts like laminar flow technology, jet flaps and distributed propulsion. However, despite these benefits, the BWB is yet to be developed for commercial air transport. This is due to several challenges resulting from the highly integrated nature of the configuration and the attendant disciplinary couplings. This study describes the development of a physics based, deterministic, multivariate design synthesis optimisation for the conceptual design and exploration of the design space of a BWB aircraft. The tool integrates a physics based Athena Vortex Lattice aerodynamic analysis tool with deterministic geometry sizing and mass breakdown models to permit a realistic conceptual design synthesis and enables the exploration of the design space of this novel class of aircraft. The developed tool was eventually applied to the conceptual design synthesis and sensitivity analysis of BWB aircraft to demonstrate its capability, flexibility and potential applications. The results obtained conforms to the pattern established from a Cranfield University study on the BlendedWing Body Aircraft and could thus be applied in conceptual design with a reasonable level of confidence in its accuracy

Re-Crafting Games: The inner life of Minecraft modding.

Prior scholarship on game modding has tended to focus on the relationship between commercial developers and modders, while the preponderance of existing work on the open-world sandbox game Minecraft has tended to focus on children’s play or the program’s utility as an educational platform. Based on participant observation, interviews with modders, discourse analysis, and the techniques of software studies, this research uncovers the inner life of Minecraft modding practices, and how they have become central to the way the game is articulated as a cultural artifact. While the creative activities of audiences have previously been described in terms of de Certeau’s concept of “tactics,” this paper argues that modders are also engaged in the development of new strategies. Modders thus become “settlers,” forging a new identity for the game property as they expand the possibilities for play. Emerging modder strategies link to the ways that the underlying game software structures computation, and are closely tied to notions of modularity, interoperability, and programming “best practices.” Modders also mobilize tactics and strategies in the discursive contestation and co-regulation of gameplay meanings and programming practices, which become more central to an understanding of game modding than the developer-modder relationship. This discourse, which structures the circulation of gaming capital within the community, embodies both monologic and dialogic modes, with websites, forum posts, chatroom conversations, and even software artifacts themselves taking on persuasive inflections

Contextual mobile adaptation

Ubiquitous computing (ubicomp) involves systems that attempt to fit in with users’ context and interaction. Researchers agree that system adaptation is a key issue in ubicomp because it can be hard to predict changes in contexts, needs and uses. Even with the best planning, it is impossible to foresee all uses of software at the design stage. In order for software to continue to be helpful and appropriate it should, ideally, be as dynamic as the environment in which it operates. Changes in user requirements, contexts of use and system resources mean software should also adapt to better support these changes. An area in which adaptation is clearly lacking is in ubicomp systems, especially those designed for mobile devices. By improving techniques and infrastructure to support adaptation it is possible for ubicomp systems to not only sense and adapt to the environments they are running in, but also retrieve and install new functionality so as to better support the dynamic context and needs of users in such environments. Dynamic adaptation of software refers to the act of changing the structure of some part of a software system as it executes, without stopping or restarting it. One of the core goals of this thesis is to discover if such adaptation is feasible, useful and appropriate in the mobile environment, and how designers can create more adaptive and flexible ubicomp systems and associated user experiences. Through a detailed study of existing literature and experience of several early systems, this thesis presents design issues and requirements for adaptive ubicomp systems. This thesis presents the Domino framework, and demonstrates that a mobile collaborative software adaptation framework is achievable. This system can recommend future adaptations based on a history of use. The framework demonstrates that wireless network connections between mobile devices can be used to transport usage logs and software components, with such connections made either in chance encounters or in designed multi–user interactions. Another aim of the thesis is to discover if users can comprehend and smoothly interact with systems that are adapting. To evaluate Domino, a multiplayer game called Castles has been developed, in which game buildings are in fact software modules that are recommended and transferred between players. This evaluation showed that people are comfortable receiving semi–automated software recommendations; these complement traditional recommendation methods such as word of mouth and online forums, with the system’s support freeing users to discuss more in–depth aspects of the system, such as tactics and strategies for use, rather than forcing them to discover, acquire and integrate software by themselves

Efficient runtime management for enabling sustainable performance in real-world mobile applications

Mobile devices have become integral parts of our society. They handle our diverse computing needs from simple daily tasks (i.e., text messaging, e-mail) to complex graphics and media processing under a limited battery budget. Mobile system-on-chip (SoC) designs have become increasingly sophisticated to handle performance needs of diverse workloads and to improve user experience. Unfortunately, power and thermal constraints have also emerged as major concerns. Increased power densities and temperatures substantially impair user experience due to frequent throttling as well as diminishing device reliability and battery life. Addressing these concerns becomes increasingly challenging due to increased complexities at both hardware (e.g., heterogeneous CPUs, accelerators) and software (e.g., vast number of applications, multi-threading). Enabling sustained user experience in face of these challenges requires (1) practical runtime management solutions that can reason about the performance needs of users and applications while optimizing power and temperature; (2) tools for analyzing real-world mobile application behavior and performance. This thesis aims at improving sustained user experience under thermal limitations by incorporating insights from real-world mobile applications into runtime management. This thesis first proposes thermally-efficient and Quality-of-Service (QoS) aware runtime management techniques to enable sustained performance. Our work leverages inherent QoS tolerance of users in real-world applications and introduces QoS-temperature tradeoff as a viable control knob to improve user experience under thermal constraints. We present a runtime control framework, QScale, which manages CPU power and scheduling decisions to optimize temperature while strictly adhering to given QoS targets. We also design a framework, Maestro, which provides autonomous and application-aware management of QoS-temperature tradeoffs. Maestro uses our thermally-efficient QoS control framework, QScale, as its foundation. This thesis also presents tools to facilitate studies of real-world mobile applications. We design a practical record and replay system, RandR, to generate repeatable executions of mobile applications. RandR provides this capability by automatically reproducing non-deterministic input sources in mobile applications such as user inputs and network events. Finally, we focus on the non-deterministic executions in Android malware which seek to evade analysis environments. We propose the Proteus system to identify the instruction-level inputs that reveal analysis environments

2015 IMSAloquium, Student Investigation Showcase

We want to express our gratitude for the generosity and steadfast support of all the experts and leaders who have nurtured These collaborative partnerships are the strength of our SIR program.https://digitalcommons.imsa.edu/archives_sir/1014/thumbnail.jp

06. 2015 IMSAloquium Student Investigation Showcase

https://digitalcommons.imsa.edu/class_of_2015/1004/thumbnail.jp

Riverine sustainment 2012

Student Integrated ProjectIncludes supplementary materialThis technical report analyzed the Navy's proposed Riverine Force (RF) structure and capabilities for 2012. The Riverine Sustainment 2012 Team (RST) examined the cost and performance of systems of systems which increased RF sustainment in logistically barren environments. RF sustainment was decomposed into its functional areas of supply, repair, and force protection. The functional and physical architectures were developed in parallel and were used to construct an operational architecture for the RF. The RST used mathematical, agent-based and queuing models to analyze various supply, repair and force protection system alternatives. Extraction of modeling data revealed several key insights. Waterborne heavy lift connectors such as the LCU-2000 are vital in the re-supply of the RF when it is operating up river in a non-permissive environment. Airborne heavy lift connectors such as the MV-22 were ineffective and dominated by the waterborne variants in the same environment. Increase in manpower and facilities did appreciable add to the operational availability of the RF. Mean supply response time was the biggest factor effecting operational availability and should be kept below 24 hours to maintain operational availability rates above 80%. Current mortar defenses proposed by the RF are insufficient.N

Economic Exchange and Social Interaction in Southeast Asia

Economic behavior is governed by two major sets of boundary conditions: environmental and technological factors on the one hand, and conditions of social organization on the other hand. Indeed, social scientists are often particularly interested in the framework of exchange relationships: exchange of goods, services, personnel, and information. Economic exchanges lend concrete manifestations to social relations that themselves may transcend the economic realm and that otherwise are often difficult to trace. Yet in social science research in Southeast Asia, the area of economic studies has lagged behind, despite the great study potential represented by the tremendous diversity of its physical and human environment. Economic Exchange and Social Interaction in Southeast Asia attempts to take advantage of that opportunity. As a number of the contributions to this volume show, many if not most of the systems organized on very different levels of integration interact with each other. Taken as a whole, they provide evidence of the incredible diversity of economic and social systems that may be investigated in Southeast Asia

Rethinking the dynamics of capital accumulation in colonial and post-colonial Indonesia: Production Regulation

This thesis explores the forces driving a series of momentous transformations to Indonesia�s production and distribution systems since early colonial rule. The analysis of these forces is anchored in four conceptual themes: the basis of these systemic transformations, their politico-economic ordering as driven by a surplus-creation imperative, labour�s role in this imperative and its response to the �ordering�, and the mode of production as the historical setting within which the transformations occur. This thesis illuminates an analytical gap in the literature by nominating labour as the key force in wealth-creation and recognising its active role in challenging ruling appropriation regimes and in the broader social struggles against exploitation and oppression. The thematic focus defines the boundaries for an exploration of successive colonial and post-colonial ruling regimes. Early chapters examine how the Dutch penetrated the Indonesian politico-economy, entrenching their systems of production organisation and creating an exclusionary system of wealth appropriation. Appropriation systems are characterised by transitions in European political and economic systems, especially from mercantilism to industrial capitalism. The entrenchment of colonial power is considered in relation to the expansion of capitalist organisation in Indonesia. The state�s stimulation of this expansion is associated with an undermining of the country�s reproductive base and a growing challenge to foreign rule. The Japanese occupying force� demolition of colonial productive and distributive linkages and encouragement of independence activism is connected with a post-war struggle for independence. Links are drawn between colonial rule and the tensions and organisational difficulties faced by Republican regimes leading up to the New Order�s re-establishment of a strict regulatory regime, and the development of an indigenous system of capitalist organisation. The surplus-generation and appropriation perspective informs the evolution of Indonesia�s productive and economic systems across colonial and post-colonial epochs and the challenges to the system of social and production regulation that heralded the destabilisation of New Order rule and the rise of the contemporary era of political democracy