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PACMHCI V8, GROUP, January 2024 Editorial
No full textInternational audienceIt is our great pleasure to introduce this issue of the Proceedings of the ACM on Human-Computer Interaction, which focuses on contributions from the research community on Supporting Group Work (GROUP). This thriving community is home to researchers within CSCW, HCI for practice-centered computing, sociotechnical studies, and interdisciplinary groups who provide theoretical, methodological, and/or conceptual contributions on collaborative technologies and practices. GROUP's research community vividly raises the awareness of dimensions of growing importance in our highly connected life, as exemplified by the papers included in this issue. Information sharing and moderation in and across groups and formal organisations continue to call for complex research questions. Collaborative practices that have been the object of concern in GROUP become revisited through the lenses of new technologies, as illustrated by the papers investigating recommender systems and conversational agents in collaborative contexts. More than ever, the Internet is acknowledged as a space for social relationships, see for instance the case of dating apps or mom's chat group in this issue. Reflecting on our densely computing supported practices, ethics for research and design become an essential topic for consideration. The editorial board worked hard to organize this first submission round. The call for papers for this issue on GROUP attracted a total of 31 submissions from all over the world, of which 8 papers (25.8 %) were accepted. This issue results from the dedicated volunteer effort of 23 members of the community who served as Associate Chairs (ACs). They all lent their expertise and time to provide insightful feedback to all authors. The Editorial Board can be found on GROUP's track page. As Track Chairs, we are grateful for the community's collective efforts to continue shaping and sharing GROUP's contributions
Le caractère polymorphe de la culture numérique : une typologie des enjeux de la participation en ligne
No full textInternational audienceL’objectif de cet article est de faire émerger une typologie des enjeux de la participation en ligne afin de mieux comprendre ce que signifie l’avènement de la « culture numérique » et de saisir son caractère polymorphe. Pour atteindre cet objectif, l’étude adopte un positionnement de recherche de nature conceptuelle recourant à la notion de « participation en ligne » et à la sociologie des usages. L’article montre que le caractère polymorphe de la culture numérique relève de six enjeux sociétaux liés à la problématique de la participation en ligne
Micro-nanojauges design to monitor surface mechanical state during high temperature oxidation of metals with application to 17-4PH stainless steel
No full textInternational audienceDetermination of mechanical state of thermal oxide growing during high temperature oxidation is a challenge. Fabrication of nanogauges for monitoring during high temperature oxidation was presently investigated up to 1000 °C. Several materials were tested in terms of mechanical behaviour and maximum working temperature for gauges used as markers during thermal loading under air. The experimental determination of the optimized gauges material for high temperature oxidation was validated. SiO2 offers particularly interesting features for gauges to determine the mechanical state of metal/oxide system. In this article, a special attention has also been paid to two nano-fabrication processes, as well as their limits. The standard electron beam lithography process is well suited to build gauges for oxidation applications, and can be improved by use of reactive ion etching process. The gauges can eventually reach several micrometers height such that the oxidation layer does not cover the gauges during thermal loading for relevant monitoring at short oxidation times. To illustrate, an application to a 17-4PH stainless steel oxidized at 480 °C is proposed and stress kinetics are deduced and related to an advanced thermomechano-chemical model, as well as identification of the numerical values of different thermomechano-chemical parameters associated to mechanisms of growth or relaxation
Lead-free Perovskites: Toward an Opto-Electronics based on Abundant Elements and Low Temperature Synthesis
No full textThis work was presented in the context of the MRS Spring meeting and Exhibit (Seattle Washnigton) that was held virtually in may 2024.Perovskite named after the Russian mineralogist L. A.Perovski. Their simple and flexible structure ABO3 fits to be doped with elements from all the periodic table. Many different materials are being developed and gradually adopted for high-performance perovskite solar cells (Rapid increase in efficiency ; from 3,8% in 2009 to 30% in 2022). The main issue is their toxicity due to lead. However their low cost production, non-toxicity, simplicity and scalable manufacturing make them promising candidates for optoelectronics of future generation
Optimization in short local supply chains: Sharing of deliveries between producers in local food logistic
No full textInternational audienceA food supply chain is considered "short and local" when it features a short physical distance between producers and consumers, with at most one intermediary between them. Such a configuration is referred to as a "short and local food supply chain" (SLFSC). Our study focuses on examining the logistical challenges associated with SLFSCs.Producers often set up organizations to simplify their logistical operations. For example, they create producers' stores, design hub points where third-party logistics operators collect goods, or engage in mutual assistance. Our study focuses on this latter type of cooperation.We assume that a producer is allowed to transport goods from another producer to customers. This practice is now permitted in France for short distances, specific products, and limited quantities. In cases where a customer C orders products from producers A and B, two types of collaboration can occur: producer A delivers to customer C after collecting goods from producer B, or producer A drops off its goods at producer B’s location, and the latter delivers to customer C.We model this new delivery-sharing problem and present our initial results.Une chaîne d'approvisionnement alimentaire est qualifiée de « courte et locale » lorsqu'elle se caractérise par une courte distance physique entre les producteurs et les consommateurs, avec au maximum un seul intermédiaire entre eux. Une telle configuration est appelée « circuit court alimentaire de proximité » (CCAP). Notre étude se concentre sur l'examen des problèmes logistiques associés aux CCAP.Les producteurs mettent souvent en place des organisations pour simplifier leurs opérations logistiques. Par exemple, ils créent des magasins de producteurs, conçoivent des points nodaux pour que des opérateurs logistiques tiers collectent les marchandises ou s'engagent dans une assistance réciproque. Notre étude se concentre sur ce dernier type de coopération.Nous considérons qu'un producteur est autorisé à transporter les marchandises d'un autre producteur vers les clients. Cette pratique est désormais possible en France pour de courtes distances, des produits spécifiques et des quantités limitées. Dans le cas où un client C commande des produits aux producteurs A et B, deux cas de collaboration peuvent survenir : le producteur A livre au client C après avoir récupéré les marchandises provenant du producteur B, ou le producteur A dépose ses propres marchandises chez le producteur B, et ce dernier livre au client C.Nous modélisons ce nouveau problème de partage des livraisons et présentons nos premiers résultats
A Matheuristic for the Grey Zone 2E-VRP with Covering Options, Multi-trip and Synchronization.
No full textInternational audienceThis paper introduces The Grey Zone Two-Echelon Vehicle Routing Problem with Covering Options, Multi-trip and Synchronization for Last-mile Deliveries (2E-MTVRPTW-SS-GZ-CO). Unlike the classical Two-echelon Vehicle Routing Problem (2E-VRP), customers can be served through either Customer-to-parcel (C2P) stations or home delivery in a given time window. Moreover, we consider satellites as possible first-echelon C2P stations and grey zone customers at city limits which can be served by both an internal combustion vehicle (ICEV) or an alternative fuel vehicle (AFV) such as in [1]. The contributions of this work are multiple: First, the problem is formally defined in Section 3. In Section 4, our multi-step GRASP-based matheuristic is presented. Finally, results and conclusions are given in Section 5
Advanced nanoplasmonic biochemical sensors for next generation of ultra-high performance environmental monitoring tools
No full textInternational audienceThe development of biochemical sensing devices that can achieve simple and fast detection with high sensitivity and specificity would significantly facilitate the efficiency for environmental monitoring. Optical sensors based on surface plasmon resonance (SPR) effect can provide several advantages that other sensors are difficult to achieve such as real-time and label-free sensing. Current SPR approaches are incapable of detecting small particles with toxins (bacteria and heavy metal ions) at a low concentration level. In this context, we will aim at the use of phase singularity enhanced optical signal to achieve a compact and more sensitive detection. By taking up this challenge, it would allow us to engineer the sensing chips in a resolution of sub-nanometer and realize an efficient and compact sensor for environmental monitoring for small pollutants
A Review on Multi-Objective Mixed-Integer Non-Linear Optimization Programming Methods
No full textInternational audienceThis paper provides a recent overview of the exact, approximate, and hybrid optimization methods that handle Multi-Objective Mixed-Integer Non-Linear Programming (MO-MINLP) problems. Both the domains of exact and approximate research have experienced significant growth, driven by their shared goal of addressing a wide range of real-world problems. This work presents a comprehensive literature review that highlights the significant theoretical contributions in the field of hybrid approaches between these research areas. We also point out possible research gaps in the literature. Hence, the main research questions to be answered in this paper involve the following: (1) how to exactly or approximately solve a MO-MINLP problem? (2) What are the drawbacks of exact methods as well as approximate methods? (3) What are the research lines that are currently underway to enhance the performances of these methods? and (4) Where are the research gaps in this field? This work aims to provide enough descriptive information for newcomers in this area about the research that has been carried out and that is currently underway concerning exact, approximate, and hybrid methods used to solve MO-MINLP problems
Severe plastic deformation for producing Superfunctional ultrafine-grained and heterostructured materials: An interdisciplinary review
No full textInternational audienceUltrafine-grained and heterostructured materials are currently of high interest due to their superior mechanical and functional properties. Severe plastic deformation (SPD) is one of the most effective methods to produce such materials with unique microstructure-property relationships. In this review paper, after summarizing the recent progress in developing various SPD methods for processing bulk, surface and powder of materials, the main structural and microstructural features of SPD-processed materials are explained including lattice defects, grain boundaries and phase transformations. The properties and potential applications of SPD-processed materials are then reviewed in detail including tensile properties, creep, superplasticity, hydrogen embrittlement resistance, electrical conductivity, magnetic properties, optical properties, solar energy harvesting, photocatalysis, electrocatalysis, hydrolysis, hydrogen storage, hydrogen production, CO2 conversion, corrosion resistance and biocompatibility. It is shown that achieving such properties is not limited to pure metals and conventional metallic alloys, and a wide range of materials are currently processed by SPD, including high-entropy alloys, glasses, semiconductors, ceramics and polymers. It is particularly emphasized that SPD has moved from a simple metal processing tool to a powerful means for the discovery and synthesis of new superfunctional metallic and nonmetallic materials. The article ends by declaring that the borders of SPD have been extended from materials science and it has become an interdisciplinary tool to address scientific questions such as the mechanisms of geological and astronomical phenomena and the origin of life
The Relevance of Frugal Innovation for Sustainability: The case of developing a solution for water scarcity
No full textInternational audienceIn the base of the pyramid (BoP) contexts, marginalized populations in rural and urban areas are among the most affected worldwide by water scarcity and poor water quality. This chapter explores the implementation of Frugal Innovation (FI) in designing solutions in the BoP. It identifies which and how FI criteria were implemented during the development of a water filtration system. The FI solution is a response to the over exploitation and contamination of water that has affected more than 1000 communities in Mexico. The chapter presents a theoretical framework on FI and the water sector. Ensuring access to water and sanitation for all is one of the objectives of sustainable development. In the Latin American context, social entrepreneurs have also contributed to developing water conservation techniques to guarantee access. The chapter contextualizes the relevance of FI for improving the quality of life of BoP communities