From Network to Web dimension in supply chain management

Cette thèse soutient que la dimension réseau, étant actuellement la portée du domaine de la gestion de chaîne logistique, contraint l’avancement de ce domaine et restreint des innovations conceptuelles et fondamentales capables d’adresser les grands défis économiques, environnementaux et sociaux. Les concepts de chaîne et de réseau ne reflètent pas la complexité des flux physiques, informationnels et financiers générés par les interactions qui ont lieu dans des réseaux interconnectés. Ces concepts n’offrent pas les fondations théoriques pour supporter des interventions allant au-delà d’un seul réseau et laissent échapper des opportunités nécessitant une vision multi-réseau. Ainsi, la dimension “web”, celle des réseaux de réseaux, est proposée comme une extension de la dimension réseau. Cette extension peut être vue comme l’étape naturelle suivante dans la progression qui a commencé par le niveau de gestion des opérations internes, est passée au niveau de la chaîne logistique et se trouve actuellement au niveau du réseau logistique. Après l’investigation théorique des raisons et de la façon d’intégrer la dimension web dans le domaine de la gestion de la chaîne logistique, la thèse étudie des implications importantes de cette intégration sur la collaboration inter-organisationnelle et le processus de prise de décision dans des environnements de webs logistiques. Elle démontre, en exploitant l’exemple des réseaux interconnectés ouverts, des potentialités inimaginables sans une vision web. Une méthodologie de conception d’un modèle de simulation permettant l’évaluation et la comparaison des webs ouverts par rapport aux webs existants est proposée. Puisque l’aide à la décision est une composante importante de la gestion de la chaîne logistique, la thèse contribue à déterminer les besoins des gestionnaires et à identifier les lignes directrices de la conception des outils d’aide à la décision offrant le support adéquat pour faire face aux défis et à la complexité des webs logistiques. Ces lignes directrices ont été compilées dans un cadre de conception des logiciels d’aide à la décision supportant la dimension web. Ce cadre est exploité pour développer quatre applications logicielles offrant aux praticiens et aux chercheurs des outils nécessaires pour étudier, analyser et démêler la complexité des webs logistiques.This thesis argues that the network dimension as the current scope of supply chain management is confining the evolution of this field and restricting the conceptual and fundamental innovations required for addressing the major challenges imposed by the evolution of markets and the increased intricacies of business relationships. The concepts of chain and network are limitative when attempting to represent the complexity of physical, informational and financial flows resulting from the interactions occurring in overlapping networks. They lack the theoretical foundations necessary to explain and encompass initiatives that go beyond a single chain or network. They also lead to overlook substantial opportunities that require beyond a network vision. Therefore, the “web” dimension, as networks of networks, is proposed as an extension to the network dimension in supply chain management. This new scope is the natural next step in the progression from the internal operations management level to the supply chain level and then to the supply network level. After a theoretical investigation of why and how the web dimension should be integrated into the supply chain management field, the thesis studies and discusses important implications of this integration on inter-organisational collaboration and of the decision-making processes in the logistic web environments. It demonstrates through the example of open interconnected logistic webs some of the potentials that cannot be imagined without a web vision. A methodology for designing a simulation model to assess the impact of such open webs versus existing webs is proposed. Since decision support is a key element in supply chain management, the thesis contributes to determine the needs of supply chain managers and identify the important axes for designing decision support systems that provide adequate assistance in dealing with the challenges and complexity presented by logistic web environments. The identified elements result in the establishment of a foundation for designing software solutions required to handle the challenges revealed by the web dimension. This conceptual framework is applied to the prototyping of four applications that have the potential of providing practitioners and researchers with the appropriate understanding and necessary tools to deal with the complexity of logistics webs

Inferring Causal Factors of Core Affect Dynamics on Social Participation through the Lens of the Observer

A core endeavour in current affective computing and social signal processing research is the construction of datasets embedding suitable ground truths to foster machine learning methods. This practice brings up hitherto overlooked intricacies. In this paper, we consider causal factors potentially arising when human raters evaluate the affect fluctuations of subjects involved in dyadic interactions and subsequently categorise them in terms of social participation traits. To gauge such factors, we propose an emulator as a statistical approximation of the human rater, and we first discuss the motivations and the rationale behind the approach.The emulator is laid down in the next section as a phenomenological model where the core affect stochastic dynamics as perceived by the rater are captured through an Ornstein-Uhlenbeck process; its parameters are then exploited to infer potential causal effects in the attribution of social traits. Following that, by resorting to a publicly available dataset, the adequacy of the model is evaluated in terms of both human raters' emulation and machine learning predictive capabilities. We then present the results, which are followed by a general discussion concerning findings and their implications, together with advantages and potential applications of the approach

Aerospace medicine and biology: A continuing bibliography with indexes (supplement 368)

This bibliography lists 305 reports, articles, and other documents introduced into the NASA Scientific and Technical Information System during Sep. 1992. The subject coverage concentrates on the biological, physiological, psychological, and environmental effects to which humans are subjected during and following simulated or actual flight in the Earth's atmosphere or in interplanetary space. References describing similar effects on biological organisms of lower order are also included. Such related topics as sanitary problems, pharmacology, toxicology, safety and survival, life support systems, exobiology, and personnel factors receive appropriate attention. Applied research receives the most emphasis, but references to fundamental studies and theoretical principles related to experimental development also qualify for inclusion

Reaktion menschlicher (Mit-)Fahrer auf hochautomatisierte Fahrzeuge im Mischverkehr auf der Autobahn und im urbanen Raum

In the future, highly automated vehicles will be introduced in road traffic, first on highways, and later in urban areas. The introduction will result in a long transition phase with mixed traffic. This transition phase poses new challenges for humans as passengers inside highly automated vehicles and for humans as drivers interacting with these vehicles in mixed traffic. Thus far, human drivers lack experience with highly automated vehicles and driving in mixed traffic. In addition, it can be expected that highly automated vehicles will drive in a more rule-compliant and defensive way than human drivers. This may cause conflicts with human drivers in mixed traffic, and lead to passenger discomfort and perceived risk. This dissertation investigated how humans react to highly automated vehicles in mixed traffic, taking both inside perspective of passengers and the outside perspective of human drivers into account. To this end, four psychological experiments. From the outside perspective, this dissertation investigated human drivers’ first contact with highly automated vehicles in dyadic interactions on the highway (Study 1) and repeated contact on longer highway sections (Study 2). Results showed that human drivers rate the rule-compliant automated driving behavior as pleasant and safe in dyadic interactions. However, human drivers feel slowed down by preceding highly automated vehicles on longer stretches of highway, which can be a potential hazard. Furthermore, an external labelling of highly automated vehicles may be recommendable in the long run. From the inside perspective of passengers, this dissertation investigated urban mixed traffic interactions with cyclists and pedestrians in longitudinal traffic (Study 3) and at a junction (Study 4). Results show that passengers do not accept any risk during highly automated driving and passengers want an early behavioral reaction of the highly automated vehicle to vulnerable road users in the driving environment. Across the four studies, the present dissertation shows that highly automated vehicles drive noticeably differently, which both passengers and manual drivers can perceive. However, highly automated driving behavior is perceived as unpleasant at maximum, but not as dangerous. When designing highly automated driving functions, both driver and passenger preferences should be considered equally. Future studies should examine the preferences of human road users regarding automated driving behavior.In Zukunft werden hochautomatisierte Fahrzeuge im Straßenverkehr eingeführt, zunächst auf der Autobahn, und später auch im urbanen Raum. Die Einführung dieser Technologie resultiert in einer langen Übergangsphase mit Mischverkehr. Dieser Übergang stellt Menschen als Passagiere und Fahrer vor neue Herausforderungen. Bislang fehlt Fahrern die Erfahrung mit hochautomatisierten Fahrzeugen und dem Fahren im Mischverkehr. Zudem ist zu erwarten, dass sich hochautomatisierte Fahrzeuge regelkonformer und defensiver fahren als menschliche Fahrer. Das könnte zu Konflikten mit anderen Verkehrsteilnehmern, und zu Diskomfort und Risikoerleben beim Passagier führen. Diese Dissertation untersuchte mithilfe von psychologischen Experimenten wie menschliche Fahrer auf hochautomatisierte Systeme aus der Passagiersicht und aus der Außensicht als manuelle Fahrer im Mischverkehr reagieren. Ein weiteres Ziel war es zu verstehen, wie hochautomatisierte Fahrzeuge fahren sollen, damit sich Passagiere sicher fühlen. Aus der Außensicht menschlicher Fahrer untersuchte diese Dissertation den Erstkontakt mit hochautomatisierten Fahrzeugen in dyadischen Interaktionen (Studie 1) und im wiederholten Kontakt (Studie 2) auf längeren Autobahnabschnitten. Die Ergebnisse zeigen, dass Fahrer das regelkonforme hochautomatisierte Fahrverhalten in dyadischen Interaktionen als angenehm und sicher bewerten. Allerdings fühlen sich Fahrer auf längeren Strecken ausgebremst, wodurch ein Gefahrenpotenzial entsteht kann. Weiterhin ist eine Außenkennzeichnung auf längere Sicht zu empfehlen. Aus der Passagiersicht untersuchte diese Dissertation urbane Mischverkehrsinteraktion im longitudinalen Verkehr (Studie 3) und an einer Einmündung (Studie 4). Die Ergebnisse zeigen, dass Passagiere keinerlei Risiko eingehen wollen und sich eine frühzeitige Verhaltensreaktion des hochautomatisierten Fahrzeugs auf schwächere Verkehrsteilnehmer in die Fahrumgebung wünschen. Studienübergreifend zeigt sich, dass hochautomatisierte Fahrzeuge merklich anders fahren, was Passagiere als auch für manuelle Fahrer wahrnehmen können. Automatisiertes Fahrverhalten wird aber maximal als unangenehm, nicht als gefährlich bewertet. Bei der technischen Auslegung automatisierter Fahrfunktionen sollten die Präferenzen von Fahrern und Passagieren gleichermaßen berücksichtigt werden. Zukünftige Studien sollten die Präferenzen anderer menschlicher Verkehrsteilnehmer im Hinblick auf das Verhalten automatisierter Fahrzeuge weiter untersuchen

PocketCare: Tracking the Flu with Mobile Phones using Partial Observations of Proximity and Symptoms

Mobile phones provide a powerful sensing platform that researchers may adopt to understand proximity interactions among people and the diffusion, through these interactions, of diseases, behaviors, and opinions. However, it remains a challenge to track the proximity-based interactions of a whole community and then model the social diffusion of diseases and behaviors starting from the observations of a small fraction of the volunteer population. In this paper, we propose a novel approach that tries to connect together these sparse observations using a model of how individuals interact with each other and how social interactions happen in terms of a sequence of proximity interactions. We apply our approach to track the spreading of flu in the spatial-proximity network of a 3000-people university campus by mobilizing 300 volunteers from this population to monitor nearby mobile phones through Bluetooth scanning and to daily report flu symptoms about and around them. Our aim is to predict the likelihood for an individual to get flu based on how often her/his daily routine intersects with those of the volunteers. Thus, we use the daily routines of the volunteers to build a model of the volunteers as well as of the non-volunteers. Our results show that we can predict flu infection two weeks ahead of time with an average precision from 0.24 to 0.35 depending on the amount of information. This precision is six to nine times higher than with a random guess model. At the population level, we can predict infectious population in a two-week window with an r-squared value of 0.95 (a random-guess model obtains an r-squared value of 0.2). These results point to an innovative approach for tracking individuals who have interacted with people showing symptoms, allowing us to warn those in danger of infection and to inform health researchers about the progression of contact-induced diseases

Collaborative Audio Transcription and Repair as a Method for Novice Pilots to Learn Approach Briefing Crew Resource Management (CRM) Skills

The growth of aviation in scope, scale, and complexity increases the demands for student learning, including crew resource management (CRM) skills. Instructor facilitated methods have proven effective for CRM skill learning. This study investigated a method of collaborative audio transcription and repair based learning (CTRBL) offering the potential for reduced demand upon instructor resources for CRM learning. The theorybased CTRBL method was used in this study as a way for novice pilots to learn the CRM skill of conducting a crew approach briefing with a focus on risk mitigation. Learning methods used to develop the CTRBL method were drawn from facilitated scenario-based training in aviation, instructional methods in language learning, and discourse analysis in aviation. The CTRBL method effectiveness was evaluated by a quasi-experimental method using 42 participants formed into 21 dyadic groups. The results suggest that CTRBL is a manageable, independent student activity that is perceived by learners to be nearly as enjoyable as comparable ground-based CRM learning methods. Participants self-rated their post-treatment crew briefings higher than their pre-treatment briefings, and subject matter experts rated post-treatment crew briefings higher than pre-treatment briefings, suggesting the CTRBL method resulted in learning. Recommendations are made for future applications and research of CTRBL

Role of Gaze Cues in Interpersonal Motor Coordination: Towards Higher Affiliation in Human-Robot Interaction

Background The ability to follow one another's gaze plays an important role in our social cognition; especially when we synchronously perform tasks together. We investigate how gaze cues can improve performance in a simple coordination task (i.e., the mirror game), whereby two players mirror each other's hand motions. In this game, each player is either a leader or follower. To study the effect of gaze in a systematic manner, the leader's role is played by a robotic avatar. We contrast two conditions, in which the avatar provides or not explicit gaze cues that indicate the next location of its hand. Specifically, we investigated (a) whether participants are able to exploit these gaze cues to improve their coordination, (b) how gaze cues affect action prediction and temporal coordination, and (c) whether introducing active gaze behavior for avatars makes them more realistic and human-like (from the user point of view). Methodology/Principal Findings 43 subjects participated in 8 trials of the mirror game. Each subject performed the game in the two conditions (with and without gaze cues). In this within-subject study, the order of the conditions was randomized across participants, and subjective assessment of the avatar's realism was assessed by administering a post-hoc questionnaire. When gaze cues were provided, a quantitative assessment of synchrony between participants and the avatar revealed a significant improvement in subject reaction-time (RT). This confirms our hypothesis that gaze cues improve the follower's ability to predict the avatar's action. An analysis of the pattern of frequency across the two players' hand movements reveals that the gaze cues improve the overall temporal coordination across the two players. Finally, analysis of the subjective evaluations from the questionnaires reveals that, in the presence of gaze cues, participants found it not only more human-like/realistic, but also easier to interact with the avatar. Conclusion/Significance This work confirms that people can exploit gaze cues to predict another person's movements and to better coordinate their motions with their partners, even when the partner is a computer-animated avatar. Moreover, this study contributes further evidence that implementing biological features, here task-relevant gaze cues, enable the humanoid robotic avatar to appear more human-like, and thus increase the user's sense of affiliation

Social VR design features and experiential outcomes:narrative review and relationship map for dyadic agent conversations

The application of virtual reality to the study of conversation and social interaction is a relatively new field of study. While the affordances of VR in the domain compared to traditional methods are promising, the current state of the field is plagued by a lack of methodological standards and shared understanding of how design features of the immersive experience impact participants. In order to address this, this paper develops a relationship map between design features and experiential outcomes, along with expectations for how those features interact with each other. Based on the results of a narrative review drawing from diverse fields, this relationship map focuses on dyadic conversations with agents. The experiential outcomes chosen include presence &amp; engagement, psychological discomfort, and simulator sickness. The relevant design features contained in the framework include scenario agency, visual fidelity, agent automation, environmental context, and audio features. We conclude by discussing the findings of the review and framework, such as the multimodal nature of social VR being highlighted, and the importance of environmental context, and lastly provide recommendations for future research in social VR.</p

A mixed reality telepresence system for collaborative space operation

This paper presents a Mixed Reality system that results from the integration of a telepresence system and an application to improve collaborative space exploration. The system combines free viewpoint video with immersive projection technology to support non-verbal communication, including eye gaze, inter-personal distance and facial expression. Importantly, these can be interpreted together as people move around the simulation, maintaining natural social distance. The application is a simulation of Mars, within which the collaborators must come to agreement over, for example, where the Rover should land and go. The first contribution is the creation of a Mixed Reality system supporting contextualization of non-verbal communication. Tw technological contributions are prototyping a technique to subtract a person from a background that may contain physical objects and/or moving images, and a light weight texturing method for multi-view rendering which provides balance in terms of visual and temporal quality. A practical contribution is the demonstration of pragmatic approaches to sharing space between display systems of distinct levels of immersion. A research tool contribution is a system that allows comparison of conventional authored and video based reconstructed avatars, within an environment that encourages exploration and social interaction. Aspects of system quality, including the communication of facial expression and end-to-end latency are reported