Multichannel queueing behaviour in urban bicycle traffic

The objective of this paper is to propose a method to analyse and describe cyclists’ behaviour at signalized intersections with specific focus on the multichannel (multi-lane) queue phenomenon. As we observed, cyclists form queues without a fixed-lane and FIFO discipline, for which the classical, car-oriented analytical approach becomes insufficient. Cyclists’ multichannel queueing behaviour is common and characterized by substantial degree of variability, especially in case of shorter queues which emerge regularly at cycle crossings. Although cyclist behaviour has been widely studied by transportation research community, their queueing behaviour picture is still incomplete. Namely, there is no method addressed to analyse the full scope of these phenomena and to quantify their impact on the cyclist queue performance. To bridge this gap, we introduce the technique to observe multichannel queues and report relevant observations, which we then complement with a methodological framework to analyse obtained results and provide a complete multichannel queue description. We video-record cyclists as they enqueue to one of multiple channels, form the queue and smoothly merge into a single lane again as the queue discharges. We apply the method to analyse results from a pilot study of 160 cyclists forming 50 queues in the city of Krakow, Poland. The proposed method allows us to analyse and quantify the observed queue performance and its characteristics: the number of channels, their emergence process, channel and queue lengths, discharge process with FIFO violations, starting and discharging times. Findings from pilot study reveal that both queue length and discharge times strongly depend on queue formation process. The contribution of this paper is the method to describe multichannel cyclist queueing behaviour, enriching current picture of bicycle flow and cyclists’ behaviour. Since the method has been developed on relatively short queues (up to 10 cyclists), findings included in this paper primarily refer to such queue sizes. Nonetheless, the method is formulated in a generic way, applicable also for longer bicycle queues. Possible practical implications are new estimates for queue lengths and discharge times - useful for bicycle infrastructure design and traffic engineering purposes

PCM telemetry data compression study, phase II Quarterly report, 25 Nov. 1965 - 25 Feb. 1966

Model analyses and computer simulations used in data compression study for improved pulse code modulation telemetry link

Building a Strong Undergraduate Research Culture in African Universities

Africa had a late start in the race to setting up and obtaining universities with research quality fundamentals. According to Mamdani [5], the first colonial universities were few and far between: Makerere in East Africa, Ibadan and Legon in West Africa. This last place in the race, compared to other continents, has had tremendous implications in the development plans for the continent. For Africa, the race has been difficult from a late start to an insurmountable litany of problems that include difficulty in equipment acquisition, lack of capacity, limited research and development resources and lack of investments in local universities. In fact most of these universities are very recent with many less than 50 years in business except a few. To help reduce the labor costs incurred by the colonial masters of shipping Europeans to Africa to do mere clerical jobs, they started training ―workshops‖ calling them technical or business colleges. According to Mamdani, meeting colonial needs was to be achieved while avoiding the ―Indian disease‖ in Africa -- that is, the development of an educated middle class, a group most likely to carry the virus of nationalism. Upon independence, most of these ―workshops‖ were turned into national ―universities‖, but with no clear role in national development. These national ―universities‖ were catering for children of the new African political elites. Through the seventies and eighties, most African universities were still without development agendas and were still doing business as usual. Meanwhile, governments strapped with lack of money saw no need of putting more scarce resources into big white elephants. By mid-eighties, even the UN and IMF were calling for a limit on funding African universities. In today‘s African university, the traditional curiosity driven research model has been replaced by a market-driven model dominated by a consultancy culture according to Mamdani (Mamdani, Mail and Guardian Online). The prevailing research culture as intellectual life in universities has been reduced to bare-bones classroom activity, seminars and workshops have migrated to hotels and workshop attendance going with transport allowances and per diems (Mamdani, Mail and Guardian Online). There is need to remedy this situation and that is the focus of this paper

Aeronautical engineering, a continuing bibliography with indexes

This bibliography lists 419 reports, articles and other documents introduced into the NASA scientific and technical information system in March 1985

A Review on Provisioning Quality of Service of Wireless Telemedicine for E-Health Services

In general, on-line medical consultation reduces time required for medical consultation induces improvement in the quality and efficiency of healthcare services. All major types of current e-health applications such as ECG, X-ray, video, diagnosis images and other common applications have been included in the scope of the study. In addition, the provision of Quality of Service (QoS) for the application of specific healthcare services in e-health, the scheme of priority for e-health services and the support of QoS in wireless networks and techniques or methods for IEEE 802.11 to guarantee the provision of QoS has also been assessed. In e-health, medical services in remote locations such as rural healthcare centers, ambulances, ships as well as home healthcare services can be supported through the applications of e-health services such as medical databases, electronic health records and the routing of text, audio, video and images. Given this, an adaptive resource allocation for a wireless network with multiple service types and multiple priorities have been proposed. For the provision of an acceptable QoS level to users of e-health services, prioritization is an important criterion in a multi-traffic network. The requirement for QoS provisioning in wireless broadband medical networks have paved the pathway for bandwidth requirements and the real-time or live transmission of medical applications. From the study, good performance of the proposed scheme has been validated by the results obtained. The proposed wireless network is capable of handling medical applications for both normal and life-threatening conditions as characterized by the level of emergencies. In addition, the bandwidth allocation and admission control algorithm for IEEE 802.16- based design specifically for wireless telemedicine/e-health services have also been presented in the study. It has been concluded that under busy traffic conditions, the proposed architecture can used as a feasible and reliable infrastructure network for telemedicine

Essays on the effect of retail innovation on consumer behavior

As a result of the convergence of online and offline retailers, and due to the notoriously low margins in the retail environment, innovation and technology have become more and more competitive differentiators. The purpose of this cumulative dissertation is to explore consumers’ behavioral reactions towards those technological innovations in brick and mortar retailing. As it is not feasible to consider every available technology in its own right, the focus of this dissertation is limited to the following three recent technologies: mobile payment, electronic shelf labels, and electric vehicle charging stations. By conducting experiments (Paper 1 and Paper 3) and leveraging real transaction data from a retailer (Paper 2), the author was able to formulate and investigate various research hypotheses, including a positive influence of new technology on the willingness to pay (Paper 1), mere revenue effect (Paper 2), and shopping intentions (Paper 3).:1 Introduction 2 Theoretical foundations 3 Purpose and focus of the dissertation 4 Article summary 4.1 Overview of dissertation articles 4.2 Summary of first article 4.3 Summary of second article 4.4 Summary of third article 5 General contributions and implications of this dissertation 6 Limitations and future research 7 Outlook References Appendix I: The effect of credit card versus mobile payment on convenience and consumers’ willingness to pay Appendix II: Behavioral consequences from converging channel capabilities: the effect of mere electronic shelf label presence on store revenue Appendix III: Recharge while you shop: the impact of free electric vehicle charging on shopping intention and shopping duratio

Influence of Convenience, Time-savings, Price, and Product Variety on Amazon Prime Members and Non-Prime Shoppers’ Online Apparel Purchase Intention

The number of internet users and online shoppers in the United States has grown at an incredible rate over the past few decades. Greater convenience and availability of a wide assortment of apparel products at a cheaper price made online shopping very enticing to consumers. Amazon.com (Amazon) gained unprecedented popularity among consumers with its Amazon Prime program. Amazon’s retail revolutions changed consumer’s way of shopping and expectations. Both online and physical store retailers are facing tremendous pressure to fulfill that level of expectation. Thus, it is essential for retailers clearly understand the shopping expectations and preferences of Amazon Prime members and non-Prime shoppers. Little research has been carried out to understand the online apparel purchasing behavior of Amazon Prime members and non-Prime shoppers. The purpose of this study was to identify and explain the perceived benefits that Amazon Prime members and non-Prime shoppers in the United States engage when developing intention to purchase apparel online. A conceptual model was extended from the Theory of Planned Behavior by incorporating external variables such as convenience, time-savings, price, and product variety. Quantitative research method consisting of an explanatory research design was used in this study. Multiple regression was selected to test the relationships based on a convenience survey sample of 334 U.S. Amazon Mechanical Turk workers. The results of this study showed that convenience, price, and product variety significantly influenced participant’s intention to purchase apparel online. Thus, participants intended to purchase apparel online when they perceived online shopping websites provided a higher level of convenience, cheaper prices, and a wide variety of apparel. However, time-savings was not found to have a significant impact on developing online apparel purchase intention. Results also indicate that Amazon Prime members perceive greater price comparison than non-Prime shoppers when shopping apparel online. Except for the price, none of the variables was significant in determining the differences between Amazon Prime members and non-Prime shoppers’ intention to purchase apparel online. Advisor: Jennifer Johnson Jorgense

Some contribution in operations research

Not availabl

Serviços omni-canal na indústria de serviços bancários: investigação qualitativa multi-método

O art.º 64 (modalidade alternativa à tese) do regulamento de estudos da Universidade de Aveiro contempla a possibilidade de apresentação de uma modalidade alternativa para teses de doutoramento. Esta modalidade assinala que “caso a tese seja substituída por um conjunto de trabalhos científicos já publicados, estes terão de formar um conjunto coerente e relevante para a área cientifica do doutoramento (...)”. Neste contexto, esta tese é baseada em 8 publicações científicas, já publicadas, ou aceites para publicação, onde estão incluídas: comunicações orais em conferências internacionais, artigos em revistas científicas e capítulos de livros. O interesse pelo tema foi aliado ao crescente desenvolvimento da estratégia omni-canal na indústria de serviços onde a banca tem sido pioneira. O objetivo é contribuir para a caracterização e compreensão das implicações decorrentes de diferentes estratégias e configurações de canal de serviço para a gestão de operações e, consequentemente para a qualidade dos serviços e satisfação dos clientes. A tese está dividida em seis capítulos. Inicia-se com duas revisões sistemáticas da literatura, para analisar as oportunidades de investigação e divulgar os caminhos de pesquisa para os serviços multicanal. Seguidamente, explicam-se as opções metodológicas e o relacionamento que existe entre a engenharia e gestão industrial e as ciências sociais. A partir desse momento, entramos na fase empírica e, analisamos os serviços omni-canal à lente das redes de negócio baseadas em tecnologia e da gestão de reclamações. Terminamos a tese com uma breve conclusão, limitações e perspetivas de investigação futura. Com maior detalhe, a revisão da literatura sugeriu que à data, os estudos existentes estavam predominantemente formulados sob a perspetiva do marketing, sendo notória uma menor representatividade de estudos focados na gestão de processos e operações de serviço. Neste contexto, o trabalho desenvolvido vem oferecer algumas contribuições ao nível da gestão de operações de serviços com recurso a múltiplos canais, permitindo nomeadamente identificar, caraterizar e consolidar diferentes estratégias de múltiplos canais, e discutir princípios para o alinhamento entre estratégias de front-office de múltiplos canais e níveis operacionais da organização. O trabalho adotou uma metodologia qualitativa multi-método (i.e., revisão sistemática e estudo de caso) recorrendo a diferentes métodos e fontes para a recolha de dados (e.g., entrevistas), bem como para a sua análise. O trabalho permitiu também ilustrar como a estratégia multi-método oferece múltiplas possibilidades de investigação que conduzem a resultados fiáveis para estudos na área da engenharia. É geralmente equilibrada e integra estudos teóricos e empíricos, o que dá maior enfase às dimensões de desenvolvimento, triangulação e complementaridade. A evidência empírica analisada no âmbito deste trabalho sugere que a prestação de serviços através de múltiplos canais potencia novas sinergias organizacionais, e cria novos desafios operacionais, ao permitir a configuração de novos sistemas de serviço que oferecem aos clientes a integração de serviços e canais de diferentes prestadores, numa experiência única. As operações de serviços omni-canal estão agora a basear-se em redes de negócio com base tecnológica, já que as empresas estão a mudar a forma como competem entre si. As empresas estão a adotar processos e canais de modo a poderem colaborar em redes heterogéneas. Essas redes de empresas geralmente combinam mais de um canal e serviços. O que origina uma experiência multimarca, que ultrapassa claramente a experiência típica omnicanal. Nesta perspetiva, a rede heterogénea de empresas é uma experiência que envolve a combinação de uma tríade de diferentes elementos canaisserviços- organizações. O que está implícito é que as redes de negócios baseadas em tecnologia estão a revolucionar a indústria de serviços, embora pouco se tenha investigado. Porém, o movimento para estratégias omni-canal e de rede de negócios está longe de ser linear. Embora indesejáveis, as falhas de serviço omni-canal são inevitáveis, nesse sentido, a gestão de reclamações sempre foi considerada como uma ferramenta essencial para os gestores. Por esse facto, o trabalho incluiu ainda uma abordagem às falhas e recuperação de serviços num contexto omni-canal, bem como as debilidades da prestação de serviços associadas às novas redes baseadas em tecnologia, no contexto dos serviços financeiros. O estudo sugeriu que os clientes geralmente não estão conscientes dos atributos de recuperação de cada canal e são muitas vezes obrigados a procurar ajuda dos colaboradores de primeira linha, em particular quando a resposta nos canais virtuais não estão a reagir de acordo com as expectativas. Os clientes também já não estão dispostos a interagir com um grande número de canais, o que implica um elevado número de interações. Em alternativa, estão dispostos a aguardar por uma recuperação personalizada quando percebem que uma falha específica pode exigir um elevado nível de tomada de decisão. Essa tolerância ocorre quando os clientes percebem que uma empresa está a realizar todos os esforços necessários para a recuperação do serviço, de modo a garantir que a falha não se volte a repetir. Os resultados evidenciaram a importância da recuperação de soluções permanentes e da gestão de operações, para permitir processos de recuperação efetivos no contexto dos serviços omni-canal e de rede de negócio. No que diz respeito às redes de negócios baseadas em tecnologia, encontrámos quatro tipos de debilidades: a) barreiras à estratégia de migração de canais; b) barreiras à entrega automatizada de serviços; c) barreiras baseadas na integração do serviço; d) barreiras à padronização de operações em contextos de rede. Os gestores devem estar cientes das debilidades das redes de negócio baseadas em tecnologia, porque a sua (in)atividade pode afetar positivamente ou negativamente a imagem da marca de rede. A resolução das debilidades Tb2N permite que as organizações sejam mais sincronizadas e competitivas. Os resultados apresentados nesta tese revelam que as estratégias de canais múltiplos estão longe de estar ultrapassadas. Esta área de estudo requer atenção permanente da comunidade académica de modo a compreender a sua evolução, o aparecimento de novas estratégias e avançar a sua base de conhecimento. Para terminar, estimulamos o desenvolvimento de investigações futuras que permitam a realização de estudos empíricos dentro das redes de negócio baseadas em tecnologia, e que se foquem não só na recolha de dados de uma empresa, mas de toda a rede.The 64th article of the regulation of studies of the University of Aveiro considers the possibility of presenting an alternative to the doctoral thesis. This modality emphasis that “if the thesis is replaced by a set of scientific papers already published, they will have to form a coherent and relevant set for the scientific area of the doctorate (…)”. In this context, this thesis is based on 8 scientific publications, some already published, some accepted for publication, which include: oral communications in international conferences, articles in scientific journals and book chapters. The interest in the subject is coined with the growing development of the omni-channel strategy in the service industry where the banks have been pioneers. The objective is to contribute to the characterization and understanding of the implications of different strategies and configurations of the service channel strategies for the management of operations and, consequently, for the service quality and customer satisfaction. The thesis is divided into six chapters. It begins with two systematic reviews of literature: to analyze research opportunities and to disseminate research paths for multi-channel services. From here on, the methodological options are explained and so are the existing relationship between the industrial engineering and the social sciences. The empirical phase starts at this point as well as the analysis of the omni-channel services in the lens of technology-based business networks and complaint management. The literature review suggested, that, to date, the existing studies were predominantly formulated from a marketing perspective, the studies focused on process management and service operations are less represented. In this context, the work developed offers some contributions to the management of multiple channel service operations, to identify, characterize and consolidate different multiple channel strategies, and discuss principles for the alignment between multiple channel front-office strategies and operational levels of the organization. A qualitative multi-method methodology (i.e., systematic review and case study) using different methods and sources was adopted for data collection (e.g., interviews) as well for its analysis. The work also illustrated how the multimethod strategy offers multiple research possibilities that lead to reliable results for studies in the field of engineering. This strategy is generally balanced and integrates theoretical and empirical studies, which give greater emphasis to the dimensions of development, triangulation and complementarity. The empirical evidence analyzed in this thesis suggests that service delivery through multiple channels raises new organizational synergies and creates new operational challenges, by allowing the configuration of new service systems that offer customers the integration of different service and channels from different providers in a unique experience. The omni-channel service operations are now based on technology-based business networks, as companies are changing the way they compete with each other. Companies are adopting processes and channels so they can collaborate in heterogeneous networks. These business networks generally combine more than one channel and services, which creates a multi-brand experience, clearly going beyond the typical omni-channel experience. In this perspective, the heterogeneous network of companies is an experience that involves the combination of a triad of different elements channel-service-organization. What is implicit is that, although still unexplored, technology-based business networks are revolutionizing the service industry. Nevertheless, the move to omni-channel and business network strategies is far from linear. Although undesirable, the omni-channel service failures are inevitable, thus complaint management has always been considered an essential tool for managers. As a result, this work also includes an approach to service failures and recovery in an omni-channel context, as well as the weaknesses in the service delivery concerning new technology-based networks, in the context of financial services. The study suggested that clients are generally unaware of the recovery attributes of each channel and are often forced to seek help from the frontline employees, particularly when the recovery from the virtual channels are not in agreement with the expectations. Customers are not willing to interact with a large number of channels which would lead to a high number of interactions. Alternatively, customers are willing to wait for a personalized recovery when they realize that a specific failure may require a high level of decision-making. This tolerance occurs when customers realize that a company is making all the necessary efforts over the service recovery, in order to ensure that the failure will not be repeated again. The results revealed the importance of recovering permanent solutions and operations management, in order to allow effective recovery processes in the context of omni-channel and business network services. With regard to technology-based business networks, we found four types of weaknesses: a) barriers to channel migration strategies; b) barriers to automated service delivery; c) barriers to employee-technology service integration; d) barriers to operations standardization in network contexts. Managers should be aware of the weaknesses of technology-based business networks because their (in)activity can affect either positively or negatively network brand image. Solving Tb2N weaknesses allows organizations to be more synchronized and competitive. The results presented in this thesis reveal that the multiple-channel strategies are far from being overcome. This area of study requires permanent attention from the academic community in order to understand its evolution, the emergence of new strategies and to advance its knowledge base. Finally, we encourage the development of future research that allows the conduction of empirical studies within technology-based business networks, focusing not only on collecting data from one company but from the entire network.Programa Doutoral em Engenharia e Gestão Industria

An overview of decision table literature 1982-1995.

This report gives an overview of the literature on decision tables over the past 15 years. As much as possible, for each reference, an author supplied abstract, a number of keywords and a classification are provided. In some cases own comments are added. The purpose of these comments is to show where, how and why decision tables are used. The literature is classified according to application area, theoretical versus practical character, year of publication, country or origin (not necessarily country of publication) and the language of the document. After a description of the scope of the interview, classification results and the classification by topic are presented. The main body of the paper is the ordered list of publications with abstract, classification and comments.