Understanding user experience of mobile video : framework, measurement, and optimization

Since users have become the focus of product/service design in last decade, the term User eXperience (UX) has been frequently used in the field of Human-Computer-Interaction (HCI). Research on UX facilitates a better understanding of the various aspects of the user’s interaction with the product or service. Mobile video, as a new and promising service and research field, has attracted great attention. Due to the significance of UX in the success of mobile video (Jordan, 2002), many researchers have centered on this area, examining users’ expectations, motivations, requirements, and usage context. As a result, many influencing factors have been explored (Buchinger, Kriglstein, Brandt & Hlavacs, 2011; Buchinger, Kriglstein & Hlavacs, 2009). However, a general framework for specific mobile video service is lacking for structuring such a great number of factors. To measure user experience of multimedia services such as mobile video, quality of experience (QoE) has recently become a prominent concept. In contrast to the traditionally used concept quality of service (QoS), QoE not only involves objectively measuring the delivered service but also takes into account user’s needs and desires when using the service, emphasizing the user’s overall acceptability on the service. Many QoE metrics are able to estimate the user perceived quality or acceptability of mobile video, but may be not enough accurate for the overall UX prediction due to the complexity of UX. Only a few frameworks of QoE have addressed more aspects of UX for mobile multimedia applications but need be transformed into practical measures. The challenge of optimizing UX remains adaptations to the resource constrains (e.g., network conditions, mobile device capabilities, and heterogeneous usage contexts) as well as meeting complicated user requirements (e.g., usage purposes and personal preferences). In this chapter, we investigate the existing important UX frameworks, compare their similarities and discuss some important features that fit in the mobile video service. Based on the previous research, we propose a simple UX framework for mobile video application by mapping a variety of influencing factors of UX upon a typical mobile video delivery system. Each component and its factors are explored with comprehensive literature reviews. The proposed framework may benefit in user-centred design of mobile video through taking a complete consideration of UX influences and in improvement of mobile videoservice quality by adjusting the values of certain factors to produce a positive user experience. It may also facilitate relative research in the way of locating important issues to study, clarifying research scopes, and setting up proper study procedures. We then review a great deal of research on UX measurement, including QoE metrics and QoE frameworks of mobile multimedia. Finally, we discuss how to achieve an optimal quality of user experience by focusing on the issues of various aspects of UX of mobile video. In the conclusion, we suggest some open issues for future study.

A software framework for risk-aware business process management

With the large diffusion of Business Process Managemen (BPM) automation suites, the possibility of managing process-related risks arises. This paper introduces an innovative framework for process-related risk management and describes a working implementation realized by extending the YAWL system. The framework covers three aspects of risk management: risk monitoring, risk prevention, and risk mitigation. Risk monitoring functionality is provided using a sensor-based architecture, where sensors are defined at design time and used at run-time for monitoring purposes. Risk prevention functionality is provided in the form of suggestions about what should be executed, by who, and how, through the use of decision trees. Finally, risk mitigation functionality is provided as a sequence of remedial actions (e.g. reallocating, skipping, rolling back of a work item) that should be executed to restore the process to a normal situation.

Access, progress, and fairness : rethinking exclusivity in copyright

This article provides a detailed critique of the incentives-access binary in copyright discourse. Mainstream copyright theory generally accepts that copyright is a balance between providing incentives to authors to invest in the production of cultural works and enhancing the dissemination of those works to the public. This Article argues that dominant copyright theory obscures the possibility of developing a model of copyright that is able to support authors without necessarily limiting access to creative works. The abundance that the Internet allows suggests that increasing access to cultural works to enhance learning, sharing, and creative play should be a fundamental goal of copyright policy. This Article examines models of supporting and coordinating cultural production without exclusivity, including crowdfunding, tips, levies, restitution, and service-based models. In their current forms, each of these models fails to provide a cohesive and convincing vision of the two main functions of copyright: instrumentally (how cultural production can be funded) and fairness (how authors can be adequately rewarded). This article provides three avenues for future research to investigate the viability of alternate copyright models: (1) a better theory of fairness in copyright rewards; (2) more empirical study of commons models of cultural production; and (3) a critical examination of the noneconomic harm limiting function that exclusivity in copyright provides.

SOA approaches

As the service-oriented architecture paradigm has become ever more popular, different standardization efforts have been proposed by various consortia to enable interaction among heterongeneous environments through this paradigm. This chapter will overview the most prevalent of these SOA approaches. It will first show how technical services can be described, how they can interact with each other and be discovered by users. Next, the chapter will present different standards to facilitate service composition and to design service-oriented environments in light of a universal understanding of service orientation. The chapter will conclude with a summary and a discussion on the limitations of the reviewed standards along their ability to describe service properties. This paves the way to the next chapters where the USDL standard will be presented, which aims to lift such limitations.

Interactive product browsing and configuration using remote augmented reality sales services

Real-time remote sales assistance is an underdeveloped component of online sales services. Solutions involving web page text chat, telephony and video support prove problematic when seeking to remotely guide customers in their sales processes, especially with configurations of physically complex artefacts. Recently, there has been great interest in the application of virtual worlds and augmented reality to create synthetic environments for remote sales of physical artefacts. However, there is a lack of analysis and development of appropriate software services to support these processes. We extend our previous work with the detailed design of configuration context services to support the management of an interactive sales session using augmented reality. We detail the context and configuration services required, presenting a novel data service streaming configuration information to the vendor for business analytics. We expect that a fully implemented configuration management service, based on our design, will improve the remote sales experience for both customers and vendors alike via analysis of the streamed information.

Asian international student attrition among Australian universities : are wellness programs the answer?

Education is one of Australia’s largest service-based exports. International students comprise approximately 24% of enrolments at Australian universities (Sawir, Marginson, Deumert, Nyland, & Ramia, 2008); and approximately 80% of these students are from the Asian region (Australian Federal Government, 2012). The financial cost of international student attrition for universities is significant. The Australian Federal Government Department of Education, Science and Training reports the attrition rates for first-year international undergraduate students ranged between 4% and 22.5% across all Australian Universities (2013). Academic, psychological, and sociocultural adjustments to a new environment can be challenging for international students. This process manifests from various stressors such as communication difficulties, adjustment to a new teaching style, new cultural norms and pressure on academic performance. These stressors result in an often overwhelming attempt to integrate and function effectively, and can consequently affect a student’s ability to meet academic requirements. The relationship between a student’s ability to successfully complete a higher education program is consistently related to a range of academic and non-academic factors. The role of specific Australian higher education institutions is vital in facilitating the continued education of Asian International students. Initiatives targeting an enhancement of modifiable lifestyle factors may have the potential to enhance a student’s ability to effectively and successfully transition into a lifestyle that facilitates their ability to adjust to the requirements of Australian universities. One possibility is the prospect of providing wellness programming, coaching and education targeting lifestyle behaviours for acculturation.

Medical Data Access Accountability in EHR Systems, A Practical Perspective

The world has experienced a large increase in the amount of available data. Therefore, it requires better and more specialized tools for data storage and retrieval and information privacy. Recently Electronic Health Record (EHR) Systems have emerged to fulfill this need in health systems. They play an important role in medicine by granting access to information that can be used in medical diagnosis. Traditional systems have a focus on the storage and retrieval of this information, usually leaving issues related to privacy in the background. Doctors and patients may have different objectives when using an EHR system: patients try to restrict sensible information in their medical records to avoid misuse information while doctors want to see as much information as possible to ensure a correct diagnosis. One solution to this dilemma is the Accountable e-Health model, an access protocol model based in the Information Accountability Protocol. In this model patients are warned when doctors access their restricted data. They also enable a non-restrictive access for authenticated doctors. In this work we use FluxMED, an EHR system, and augment it with aspects of the Information Accountability Protocol to address these issues. The Implementation of the Information Accountability Framework (IAF) in FluxMED provides ways for both patients and physicians to have their privacy and access needs achieved. Issues related to storage and data security are secured by FluxMED, which contains mechanisms to ensure security and data integrity. The effort required to develop a platform for the management of medical information is mitigated by the FluxMED's workflow-based architecture: the system is flexible enough to allow the type and amount of information being altered without the need to change in your source code.

Pickup and delivery problem using metaheuristics techniques

Dial-a-ride problem (DARP) is an optimization problem which deals with the minimization of the cost of the provided service where the customers are provided a door-to-door service based on their requests. This optimization model presented in earlier studies, is considered in this study. Due to the non-linear nature of the objective function the traditional optimization methods are plagued with the problem of converging to a local minima. To overcome this pitfall we use metaheuristics namely Simulated Annealing (SA), Particle Swarm Optimization (PSO), Genetic Algorithm (GA) and Artificial Immune System (AIS). From the results obtained, we conclude that Artificial Immune System method effectively tackles this optimization problem by providing us with optimal solutions. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.

Urban Floods: Case Study of Bangalore

Bangalore is one of the fastest growing cities in India and is branded as ‘Silicon Valley of India’ for heralding and spearheading the growth of Information Technology (IT) based industries in the country. With the advent and growth of IT industry, as well as numerous industries in other sectors and the onset of economic liberalisation since the early 1990s, Bangalore has taken lead in service-based industries fuelling substantial growth of the city both economically and spatially. Bangalore has become a cosmopolitan city attracting people and business alike, within and across nations. This profile notes the urban setting and provides an overview of the urban fabric, while discussing various prospects related to infrastructure and governance (Sudhira, et al. 2007).

Optoelectronic quotient-selected modified signed-digit division

A novel optoelectronic quotient-selected modified signed-digit division technique is proposed. This division method generates one quotient digit per iteration involving only one shift operation, one quotient selection operation and one addition/subtraction operation. The quotient digit can be selected by observing three most significant digits of the partial remainder independent of the divisor. Two algorithms based on truth-table look-up and binary logic operations are derived. For optoelectronic implementation, an efficient shared content-addressable memory based architecture as well as compact logic array processor based architecture with an electron-trapping device is proposed. Performance evaluation of the proposed optoelectronic quotient-selected division shows that it is faster than the previously reported convergence division approach. Finally, proof-of-principle experimental results are presented to verify the effectiveness of the proposed technique. (C) 2001 Society of Photo-Optical Instrumentation Engineers.

Arquitectura de Comunicaciones para Sistemas Ciber-Físicos Basada en OPC UA

[ES]Los sistemas Ciber-Físicos (Cyber-Physical Systems – CPS) son dispositivos que integran computación, control y comunicaciones. Actualmente se puede encontrar este tipo de sistemas en áreas tan diversas como la industria aeroespacial, automotriz, procesos químicos, infraestructura civil, etc. Entre las arquitecturas de comunicación empleadas en estos dispositivos, OPC UA se consolida como la más adecuada. OPC Unified Architecture es la nueva generación de tecnología propuesta por OPC Foundation para transmitir datos en bruto e información pre procesada entre los niveles de producción y los sistemas de planificación de producto de la empresa. Mediante OPC UA se puede disponer de toda la información deseada para cualquier aplicación y usuario autorizados, en cualquier instante y en cualquier lugar. En este proyecto se pretende desarrollar una arquitectura basada en OPC UA sobre CPSs para el acceso a datos de producción. Para ello se partirá de arquitecturas basadas en PC empotrados y redes de comunicación industriales.

A dinâmica da demanda por serviços de saúde no município de Piraí, RJ, do ponto de vista da medicalização

Apesar da definição da Estratégia de Saúde da Família (ESF) como porta de entrada preferencial do sistema de saúde e estratégia de reorganização da assistência, os usuários do SUS, vêm demonstrando historicamente preferência pelo serviço de urgência/emergência hospitalar. Neste contexto, o campo do presente estudo é a cidade de Piraí e seus habitantes, que desde 2002 contam com 100% de cobertura da ESF, modelo que dá ênfase: à lógica territorial na assistência, no cuidado continuado e transversal, no vínculo e no acesso facilitado pelo acolhimento humanizado e escuta qualificada; ocupando o centro da rede de serviços atuando como ordenador e coordenador do cuidado. Avaliando os dados de produtividade (com foco nas consultas médicas) hospitalar e da ESF notamos que a busca por assistência médica hospitalar, tem aumentado exponencialmente, e pode-se perceber que a grande maioria destes usuários se apresenta ao serviço com demandas de atenção básica, o que é considerado ilógico e contraditório na visão de gestores e profissionais. A prática profissional tem me levado a um processo de reflexão sobre as expectativas dos usuários ao procurarem o sistema de saúde (principalmente a ESF), sobre os caminhos que cada um deles constrói diante de uma questão de saúde e como se dá a tomada de decisão em busca da resolutividade da questão. Dessa forma, o objetivo deste trabalho é compreender como se constrói essa demanda; que critérios estão envolvidos na tomada de decisão desses usuários ao optarem pelo serviço de emergência como porta de entrada preferencial; mesmo em um município que oferece um serviço estruturado, pautado nas diretrizes da ESF e com uma cobertura que alcança toda a sua população. Acreditamos que o processo conhecido como medicalização da vida, que descreve o processo pelo qual problemas não médicos são definidos e tratados como problemas médicos, usualmente em termos de doenças e desordens (CONRAD, 2007); influencie na construção dessa demanda. Quanto a metodologia, foram realizadas entrevistas semiestruturadas, com usuários do SUS, residentes no município e que buscaram espontaneamente o serviço de urgência/emergência hospitalar. Verificou-se que a imagem que o usuário faz dos serviços de saúde se relaciona principalmente com o tempo de espera pelo atendimento, o acesso (interpretado principalmente como a certeza/incerteza do atendimento) e a acessibilidade. Os usuários frequentemente se referem à organização das unidades da ESF com o significado de barreiras ao acesso (principalmente pela necessidade de agendamento) e demonstram ter em relação às USF uma imagem de grande limitação de recursos humanos (quase exclusivamente em relação ao médico) e materiais. Por outro lado, prontos-socorros e hospitais se apresentam para eles, por várias razões, como espaços de acesso garantido. É importante ressaltar que o processo de medicalização da vida aparece como parte importante da engrenagem que move a construção dessa demanda.

Boundary-layer suction system design for laminar-flying-wing aircraft

The present study aims to provide insight into the parameters affecting practical laminar-flow-control suction power requirements for a commercial laminar-flying-wing transport aircraft. It is shown that there is a minimum power requirement independent of the suction system design, associated with the stagnation pressure loss in the boundary layer. This requirement increases with aerofoil section thickness, but depends only weakly on Mach number and (for a thick, lightly loaded laminar flying wing) lift coefficient. Deviation from the optimal suction distribution, due to a practical chamber-based architecture, is found to have very little effect on the overall suction coefficient; hence, to a good approximation, the power penalty is given by the product of the optimal suction flow rate coefficient and the average skin pressure drop. In the spanwise direction, through suitable choice of chamber depth, the pressure drop due to frictional and inertial effects may be rendered negligible. Finally, if there are fewer pumps than chambers, the average pressure drop from the aerofoil surface to the pump collector ducts, rather than to the chambers, determines the power penalty. For the representative laminar-flying-wing aircraft parameters considered here, the minimum power associated with boundary-layer losses alone contributes some 80-90% of the total power requirement. © 2011 by the American Institute of Aeronautics and Astronautics, Inc.

Performance assessment of XACML authorizations for supply chain traceability web services

Service-Oriented Architecture (SOA) and Web Services (WS) offer advanced flexibility and interoperability capabilities. However they imply significant performance overheads that need to be carefully considered. Supply Chain Management (SCM) and Traceability systems are an interesting domain for the use of WS technologies that are usually deemed to be too complex and unnecessary in practical applications, especially regarding security. This paper presents an externalized security architecture that uses the eXtensible Access Control Markup Language (XACML) authorization standard to enforce visibility restrictions on trace-ability data in a supply chain where multiple companies collaborate; the performance overheads are assessed by comparing 'raw' authorization implementations - Access Control Lists, Tokens, and RDF Assertions - with their XACML-equivalents. © 2012 IEEE.