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Wireless Device Connection Problems and design Solutions

Chinese Journal of Mechanical engineering 2016年第6期29卷 1145-1155页

作者： SONG Ji-Won NORMAN Donald NAM Tek-Jin QIN Shengfeng College of Engineering Design and Physical Sciences Brunel University London The Design Lab University of California Department of Industrial Design Korea Advanced Institute of Science and Technology Department of Design Northumbria University

Users, especially the non-expert users, commonly experience problems when connecting multiple devices with interoperability. While studies on multiple device connections are mostly concentrated on spontaneous device association techniques with a focus on security aspects, the research on user interaction for device connection is still limited. More research into understanding people is needed for designers to devise usable techniques. This research applies the Research-through-design method and studies the non-expert users＇ interactions in establishing wireless connections between devices. The ＂Learning from Examples＂ concept is adopted to develop a study focus line by learning from the expert users＇ interaction with devices. This focus line is then used for guiding researchers to explore the non-expert users＇ difficulties at each stage of the focus line. Finally, the Research-through-design approach is used to understand the users＇ difficulties, gain insights to design problems and suggest usable solutions. When connecting a device, the user is required to manage not only the device＇s functionality but also the interaction between devices. Based on learning from failures, an important insight is found that the existing design approach to improve single-device interaction issues, such as improvements to graphical user interfaces or computer guidance, cannot help users to handle problems between multiple devices. This study finally proposes a desirable user-device interaction in which images of two devices function together with a system image to provide the user with feedback on the status of the connection, which allows them to infer any required actions.

关键词： wireless connection device association user-multiple device interaction smart production system Research through design learning from examples

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High‑Defect‑Density Graphite for Superior‑Performance Aluminum‑Ion Batteries with Ultra‑Fast Charging and Stable Long Life

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Nano-Micro Letters 2021年第11期13卷 168-189页

作者： Jisu Kim Michael Ruby Raj Gibaek Lee Advanced Energy Materials Design Lab School of Chemical EngineeringYeungnam UniversityGyeongsan 38541Republic of Korea

Rechargeable aluminum-ion batteries(AIBs)are a new generation of low-cost and large-scale electrical energy storage ***,AIBs suffer from a lack of reliable cathode materials with insufficient intercalation sites,poor ion-conducting channels,and poor diffusion dynamics of large chloroaluminate anions(AlCl4−and Al2Cl7−).To address these issues,surfacemodified graphitic carbon materials[i.e.,acidtreated expanded graphite(AEG)and base-etched graphite(BEG)]are developed as novel cathode materials for ultra-fast chargeable *** has more turbostratically ordered structure covered with abundant micro-to nano-sized pores on the surface structure and expanded interlayer distance(d002=0.3371 nm)realized by surface treatment of pristine graphite with acidic media,which can be accelerated the diffusion dynamics and efficient AlCl4−ions(de)-intercalation *** AIB system employing AEG exhibits a specific capacity of 88.6 mAh g^(−1)(4 A g^(−1))and~80 mAh g^(−1) at an ultra-high current rate of 10 A g^(−1)(~99.1%over 10,000 cycles).BEG treated with KOH solution possesses the turbostratically disordered structure with high density of defective sites and largely expanded d-spacing(d002=0.3384 nm)for attracting and uptaking more AlCl4−ions with relatively shorter penetration ***,the AIB system based on the BEG cathode delivers a high specific capacity of 110 mAh g^(−1)(4 A g^(−1))and~91 mAh g^(−1)(~99.9%over 10,000 cycles at 10 A g^(−1)).Moreover,the BEG cell has high energy and power densities of 247 Wh kg^(−1) and 44.5 kW kg^(−1).This performance is one of the best among the AIB graphitic carbon materials reported for chloroaluminate anions storage *** finding provides great significance for the further development of rechargeable AIBs with high energy,high power density,and exceptionally long life.

关键词： Surface modification Etched graphite Cathode materials Energy storage Aluminum-ion batteries

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Equivalence between enhanced assumed strain method and assumed stress hybrid method based on the Hellinger-Reissner principle

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN engineering 1996年第18期39卷 3083-3099页

作者： Yeo, ST Lee, BC Engineering System and Design Lab Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusung-gu Taejon 305-701 Korea [*]Engineering System and Design Lab Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusung-gu Taejon 305-701 Korea

An equivalence between the enhanced assumed strain (EAS) method based on the Hu-Washizu principle, recently proposed by Simo and Rifai, and assumed stress hybrid (hybrid) method based on the Hellinger-Reissner principle is investigated. It is proved that not only the displacements but also the stresses of the EAS-elements calculated from the strains are identical to those of the corresponding hybrid-elements at least at the Gauss integration points provided the spaces of the trial functions for enhanced assumed strains and for assumed stresses satisfy the orthogonality and the inclusion or the invertibility condition. By virtue of this equivalence, a stress recovery procedure of the EAS-elements is devised. This procedure is variationally consistent and more efficient than those proposed by Simo and Rifai and Andelfinger and Ramm. Since the classical method of incompatible displacement modes is a special case of the EAS-method, this procedure also can be used to evaluate variationally consistent stresses for the non-conforming elements.

关键词： EAS-method hybrid-method equivalence stress recovery

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Function-regeneration of non-porous hydrolyzed-MOF-derived materials

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Nano Research 2019年第8期12卷 1921-1930页

作者： Yo Chan Jeong Jin Weon Seo Jae Ho Kim Seunghoon Nam Min Chang Shin Young Shik Cho Jin Syul Byeon Chong Rae Park Seung Jae Yang Carbon Nanomaterials Design Laboratory Research Institute of Advanced Materials and Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Advanced Nanohybrids Lab. Department of Chemical Engineering Inha UniversityIncheon 22212Republic of Korea School of Advanced Materials Engineering College of Engineering Andong National University Andong Gyeongsangbuk-do 36729Republic of Korea

A facile synthetic strategy based on a water-based process is developed for the preparation of metal-organic framework (MOF)-derived materials by revisiting the hydrolyzed non-porous metal-organic frameworks (h-MOF). The poor water stability of MOF has been recognized as key limitations for its commercialization and large-scale applications because the hydrolysis resulted in the complete loss of their functionalities. However, we found that the negative effect of hydrolysis on MOF can be nullified during the heat treatment. As similar to the intact MOF, h-MOF can be used as a precursor for the preparation of MOF-derived materials from porous MOF-derived carbons (MDCs) to MDC@ZnO composites. The property of h-MOF-derived materials is almost equivalent to that of MOF-derived materials. In addition, h-MOF turned the weakness of water instability to the strength of facile water-based process for hybridization. With the demonstration of the hybrid composite between h-MDC@ZnO and reduced graphene oxide (rGO) as a prototype example, it exhibited superior electrochemical performance when evaluated as an electrode material for lithium-ion batteries.

关键词： nanomaterials metal-organic framework (MOF) porous materials MOF-derived carbon hydrolyzed MOF

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Usability evaluation of a mobile ecological interface design application for diabetes management

Usability evaluation of a mobile ecological interface design...

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49th Annual Meeting of the Human Factors and Ergonomics Society, HFES 2005

作者： Kwok, Jordanna Burns, Catherine M. Advanced Interface Design Lab. Department of Systems Design Engineering University of Waterloo Waterloo ON Canada

ISBN: (纸本)094528926X

Healthcare applications for small-screen mobile devices are becoming increasingly common for medical professionals and patients. Even so, usability issues including navigation and screen clutter remain a challenge. Ecological Interface design (EID) was used to design a patient-oriented diabetes management display for Java-enabled mobile devices, making it one of the first mobile EID (mEID) applications. This paper presents a usability evaluation of the diabetes management application, which compares the mEID display to a modified taskbased display (mEID+Task). The mEID+Task display integrates functional task characteristics such as frequency and necessity;menu structure, item ordering, item labelling, and input scheme were varied. Results showed that normalised trial completion times were moderately faster in the mEID+Task display than in the mEID display, while no differences were observed in trial completion accuracy. Furthermore, the mEID+Task display received higher preference ratings than the mEID display alone. The findings suggest that the usability of mEID displays can be improved by incorporating a task-oriented approach.

关键词： Mobile devices

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Choosing the best from the good: Display engineering principles

Choosing the best from the good: Display engineering princip...

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49th Annual Meeting of the Human Factors and Ergonomics Society, HFES 2005

作者： Burns, Catherine M. Advanced Interface Design Lab. Department of Systems Design Engineering University of Waterloo Waterloo ON Canada

ISBN: (纸本)094528926X

Most guidance documents on display design either provide a rigid design standard or a list of high level principles. I argue that neither of these approaches is adequate for a complex display design effort. We need instead to develop a category of higher level "display engineering" principles and methods that can consistently drive a professional display designer to best practices in display design. While this concept of display engineering principles still needs development, I will propose two example display engineering practices, graphical object sensitivity analysis and display design with a margin of safety as examples of what could be gained by establishing a systematic display engineering process.

关键词： Display devices

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design of advanced graphical displays for the turbine-generator systems of the Forsmark 3 simulator

Design of advanced graphical displays for the turbine-genera...

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27th Annual Conference of the Canadian Nuclear Society and 30th Canadian Nuclear Society - Nuclear Energy A World of Service to Humanity

作者： Kwok, Jordanna Burns, Catherine M. Advanced Interface Design Lab. Systems Design Engineering University of Waterloo Waterloo Ont.

ISBN: (纸本)0919784860

As new technologies are introduced into the nuclear industry, there is increasing interest in replacing existing hardwired monitoring systems in nuclear power plant control rooms with innovative human-machine interface (HMI) graphical displays. However, investigations into past accidents at nuclear generating facilities have identified human performance limitations arising from HMI design as one of the most important factors in plant safety. Ecological Interface design (EID) is a design methodology for HMI graphical displays that attempts to support operator performance for both anticipated and unanticipated events, which are often precursors to serious accidents. The University of Waterloo and the University of Toronto are collaborating with the Norwegian Institute for Energy Technology (IFE) to examine the application of EID in the Swedish Forsmark 3 boiling water reactor nuclear power plant. This paper focuses on the design of advanced graphical displays for the turbine-generator systems.

关键词： User interfaces

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SYNTHESIS OF pH-RESPONSIVE AMPHIPHILIC DIBLOCK COPOLYMERS CONTAINING POLYISOBUTYLENE via OXYANION-INITIATED POLYMERIZATION AND THEIR MULTIPLE SELF-ASSEMBLY MORPHOLOGIES

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Chinese Journal of Polymer Science 2013年第2期31卷 218-231页

作者： Huai-chao Wang Ming-zu Zhang 倪沛红 Jin-lin He Ying Hao Yi-xian Wu College of Chemistry Chemical Engineering and Materials Science Soochow University Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Soochow University State Key Lab of Chemical Resource Engineering Beijing University of Chemical Technology

Two pH-responsive amphiphilic diblock copolymers, namely polyisobutylene-block-poly[2-（N,N- dimethylamino）ethyl methaerylate] （PIB-b-PDMAEMA） and polyisobutylene-block-poly（metharylic acid）（PIB-b-PMAA）, were synthesized via oxyanion-initiated polymerization, and their multiple self-assembly behaviors have been studied. An exo-01efin-terminated highly reactive polyisobutylene （HRPIB） was first changed to hydroxyl-terminated PIB （PIB-OH） via hydroboration-oxidation of C =C double bond in the chain end, and then reacted with KH to yield a potassium alcoholate of PIB （PIB-O-K＋）. PIB-O-K＋ was immediately used as a macroinitiator to polymerize DMAEMA monomer, resulting in a cationic diblock copolymer PIB-b-PDMAEMA. With the similar synthesis procedure, the anionic diblock copolymer PIB-b- PMAA could be prepared via a combination of oxyanion-initiated polymerization of tert-butyl methacrylate （tBMA） and subsequent hydrolysis of tert-butyl ester groups in PtBMA block. The functional PIB and block copolymers have been fully characterized by 1H-NMR, FT-IR spectroscopy, and gel permeation chromatography （GPC）. These samples allowed us to systematically investigate the effects of block composition on the pH responsivity and various self-assembled morphologies of the copolymers in THF/water mixed solvent. Transmission electron microscopy （TEM） images revealed that these diblock copolymers containing small amount of original PIB without exo-olefin-terminated group are able to self-assemble into micelles, vesicles with different particle sizes and cylindrical aggregates, depending on various factors including block copolymer composition, solvent polarity and pH value.

关键词： Oxyanion-initiated polymerization Polyisobutylene Stimuli responsivity Amphiphilic copolymer Self- assembly.

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Extraordinary Ultrahigh-Capacity and Long Cycle Life Lithium-Ion Batteries Enabled by Graphitic Carbon Nitride-Perylene Polyimide Composites

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Energy & Environmental Materials 2023年第6期6卷 199-226页

作者： Michael Ruby Raj Jungwon Yun Dong-kyu Son Gibaek Lee Advanced Energy Materials Design Lab School of Chemical EngineeringYeungnam University38541Gyeongsan-siKorea William G.Lowrie Chemical and Biomolecular Engineering The Ohio State UniversityColumbus OH 43210USA

Graphitic carbon nitride(g-C_(3)N_(4))is widely used in organic metal-ion batteries owing to its high porosity,facile synthesis,stability,and high-rate ***,pristine g-C_(3)N_(4)nanosheets exhibit poor electrical conductivity,irreversible metal-ion storage capacity,and short-term cycling owing to their high concentration of graphitic-N ***,a series of 3,4:9,10-perylenetetracarboxylic diimide-coupled g-C_(3)N_(4)composite anode materials,CN-PI_(x)(x=0.2,0.5,0.75,and 1),was investigated,which exhibited an unusually high surface nitrogen content(23.19-39.92 at.%)and the highest pyridinic-N,pyrrolic-N,and graphitic-N contents reported to *** CN-PI_(1)anode delivers an unprecedented and continuously increasing ultrahigh discharging capacity of exceeding 8400 mAh g^(-1)(1.96 mWh cm^(-2))at 100 mA g^(-1)with high specific energy density(E_(sp))of~7700 Wh kg^(-1)and the volumetric energy density(E_(v))of~14956 Wh L-1 and an excellent long-term stability(414 mAh g^(-1)or 0.579 mWh cm^(-2)at 1 A g^(-1)).Furthermore,the activation of the CN-PI_(x)electrodes contributes to their superior electrochemical performance,resulting from the fact that the Li+is not only stored in the CN-PI_(x)composites but also CN-PI_(x)activated the Li^(0)adlayer on the CN-PI_(1)-Cu heterojunction as an SEI layer to avoid the direct contact of Li^(0)phase and the *** CN-PI_(1)full cell with LiCoO_(2)as the cathode delivers a discharge capacity of~587 mAh g^(-1)at a 1 A g^(-1)after 250 cycles with a Coulombic efficiency nearly 99%.This study provides a strategy to develop N-doped g-C_(3)N_(4)-based anode materials for realizing long-lasting energy storage devices.

关键词： graphitic carbon nitride lithium-ion batteries organic electrode perylene polyimide semiconductor-metal heterojunction

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An empirical study on randomized optimal area polygonization of planar point sets

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ACM Journal of Experimental Algorithmics 2016年第1期21卷 1–24页

作者： Peethambaran, Jiju Parakkat, Amal Dev Muthuganapathy, Ramanathan Department of Engineering Design Advanced Geometric Computing Lab Indian Institute of Technology Madras 600036 India

While random polygon generation from a set of planar points has been widely investigated in the literature, very few works address the construction of a simple polygon with minimum area (MINAP) or maximum area (MAXAP) from a set of fixed planar points. Currently, no deterministic algorithms are available to compute MINAP/MAXAP, as the problems have been shown to be NP-complete. In this article, we present a greedy heuristic for computing the approximate MINAP of any given planar point set using the technique of randomized incremental construction. For a given point set of n points, the proposed algorithm takes O(n² log n) time and O(n) space. It is rather simplistic in nature, hence very easy for implementation and maintenance. We report on various experimental studies on the behavior of a randomized heuristic on different point set instances. Test data have been taken from the SPAETH cluster data base and TSPLIB library. Experimental results indicate that the proposed algorithm outperforms its counterparts for generating a tighter upper bound on the optimal minimum area polygon for large-sized point sets. © 2016 ACM 1084-6654/2016/04-ART1.10 $15.00.

关键词： Convex n-gons Incremental algorithm Maximal area polygon Minimal area polygon Randomized algorithm

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