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[ACM Press the 2019 ACM International Joint Conference on Pervasive and Ubiquitous Computing and the 2019 ACM International Symposium - London, United Kingdom (2019.09.09-2019.09.13)] Proceedings of the 2019 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2019 ACM International Symposium on Wearable Computers - UbiComp/ISWC '19 - Smart eyewear enabled interactive pet toy for users with limited mobility
摘要： Smart eyewear that detects eye movements and head motions have been applied to studies on detecting onea??s mental state [5], engagement level in social interactions, and measuring concentration [4]. However, applications for these smart eyewear that offers intriguing and novel interactive experience has seldom been used as wearable device-control. As an application of this type of wearable, we used J!NS MEME that enables head motion data to control smart devices with hands-free operation in a pet toy system to facilitate human-animal interaction for people in cases of limited mobility either due to physical disability or the lack of enough space allowance. For our study, we primarily focused on exploring interaction possibilities between pet owners, who experience physical limitations due to the latter context, and their pets. The study result shows a promising start for opening up new interaction opportunities for our targeted audience in the context of physical limitation; however, the impact on those with physical disabilities is still arguable as it is yet to be evaluated.Nevertheless, since smart eyewear can act as an unobtrusive and useful body extension for people with limited mobility, we believe that it can be an alternative input option that can be applied not just to human-animal interaction but also to wider domains such smart devices and home systems for these users.
关键词： human-animal interaction,computer interaction for disabled persons,hands-free input,head movement interaction,eye-wear computing,assistive technology,inclusive design
更新于2025-09-12 10:27:22
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Fatigue Strength of Laser Beam Welded Steel-Aluminium Joints Considering Variable Amplitude Loading and Corrosive Environment
摘要： Hybrid material combinations of steel and aluminium are currently being joined by explosive welding in ship design, in order to reduce fuel consumption and increase transport weight. As an alternative to the elaborate and expensive explosive welding, a replacement for steel-aluminium adapters by means of laser beam welding in a lap joint configuration is being aimed at. Therefore, a laser beam welding process has been developed and optimised with regard to the different melting points and coefficients of thermal expansion of the materials as well as the formation of intermetallic phases due to the limited solubility of the elements. The characteristic of the weld seam, which is the result of a melt pool through the steel into the aluminium material, has a major impact on the quasi-static and cyclic strength of the joint. Especially the weld width and penetration depth have been identified as main influencing parameters. In the end, the developed laser beam welding process under spectroscopic control of the penetration depth is validated by fatigue investigations of lap joints and compact designed adapters. In addition to the fatigue strength under constant amplitude loading (CAL), the fatigue performance under variable amplitude loading (VAL) is particularly promising, even though the scatter increases from CAL to VAL and a linear damage accumulation is not applicable. A change in the fracture behaviour is explained by the intensity of the loading. Finally, the corrosion fatigue behaviour is shown by constant amplitude loading in a corrosive environment with a sodium chloride solution of 5 %, which causes a strength reduction from high cycle to long life fatigue.
关键词： steel-aluminium joint,ship building,corrosion fatigue,explosion welding,laser beam welding,lap joint,corrosive environment,ship design,constant amplitude loading,variable amplitude loading,compact adapter,fatigue assessment
更新于2025-09-12 10:27:22
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Substrate-Integrated-Waveguide Power Dividers: An Overview of the Current Technology
摘要： Power dividers are important components of microwave/millimeter wave (mm-wave) circuit design. This article provides a comprehensive review of the state-of-the-art substrate-integrated-waveguide (SIW) power dividers/combiners. SIW technology converts waveguide-like structures into planar form, compensates for the drawbacks of microstrip structures at higher-frequency circuit designs, and minimizes production complexity and costs compared to conventional waveguide structures. An overview of how traditional dividers have progressively adopted the SIW technique is presented and a comparative performance analysis of the divider types and practical paradigm show the future potential of SIW technology.
关键词： microwave,power dividers,Substrate-integrated-waveguide (SIW),circuit design,millimeter wave
更新于2025-09-12 10:27:22
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High-Voltage AlInGaN LED Chips
摘要： A high-voltage light-emitting diode (LED) flip chip based on an AlInGaN heterostructure is developed and fabricated. The LED flip chip consists of 16 elements connected in series, each of which is a conventional LED. The chip with a total area of 1.25 × 1.25 mm is intended for a working current of 20 mA and a forward voltage of 48 V. To improve the current-distribution uniformity over the active region of the chip elements and to minimize the losses of the element area occupied by the n-type contact, the n-type contact pads in them are arranged inside the p-type contact region due to the two-level metallization layout with an intermediate insulating layer of dielectric. The arrangement topology of the contact pads is developed using numerical simulation. An increase in the quantum efficiency of the chip is provided by the application of combinations of metals with a high reflectance at the LED emission wavelength, which are used when fabricating n- and p-type contacts as well as current-carrying strips.
关键词： light-emitting diode,flip-chip design,LED chip,gallium nitride,high-voltage chip
更新于2025-09-12 10:27:22
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Thermal joining of thermoplastics to metals: Surface preparation of steel based on laser radiation and tungsten inert gas arc process
摘要： Laser-based joining is a potential key manufacturing process for realizing metal plastic hybrids. Therefore, surface preparation is essential to achieve a mechanical form fit. A new approach for surface preparation is based on a tungsten inert gas (TIG) arc process with anodic polarity. This TIG structure was characterized compared to fiber laser manufactured structures in cw and pw mode. The comparison of different preparations was based on pure ultimate tensile strength tests on spot joints. Finally, a transfer to overlap joints was successfully carried out and characterized by tensile shear tests using fiber reinforced plastics.
关键词： laser joining,surface preparation,laser welding,TIG welding,structured steel,metal-plastic-hybrid joints,dissimilar materials,lightweight design
更新于2025-09-12 10:27:22
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Investigations on Driver and Layout for Paralleled GaN HEMTs in Low Voltage Application
摘要： Gallium nitride is becoming more popular in low-voltage applications. Gallium nitride (GaN) high electron mobility transistors (HEMTs) has positive temperature feature. It makes parallel application feasible for GaN HEMTs. Meanwhile, paralleled GaN HEMTs will increase the power handling capability and the efficiency of the converter. The parasitic parameters of both driving and power loop layout are critical which need to be equalized and minimized in GaN HEMT parallel operation. The parameters mismatch of the parallel branch will lead to significant effect on the dynamic characteristics and bring thermal problem of the GaN HEMTs. This paper focuses on the design of paralleled low-voltage enhancement GaN HEMT, and evaluates the effect of the parasitic inductances in both driver and power loops. The LT-spice and ANASYS Q3D Extractor simulation are carried out to analysis the effect of the unbalance parameters. The design guidelines for driver and PCB design are summarized as well. Finally, a 300W isolated DC-DC converter is built to verify the analysis and simulation on parallel operation.
关键词： Solar Energy,DC-DC Converter,Driver Design,Paralleling,Enhancement,Low-Voltage GaN HEMT,Parasitic Parameters
更新于2025-09-12 10:27:22
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[IEEE 2019 23rd International Conference on Mechatronics Technology (ICMT) - SALERNO, Italy (2019.10.23-2019.10.26)] 2019 23rd International Conference on Mechatronics Technology (ICMT) - Analysis of Fuel Savings Enabled by Photovoltaic Panel Addition on a 48V Mild Hybrid Vehicle
摘要： Recovering solar energy, and then fully reusing it, can significantly improve light duty vehicles’ efficiency, hence reducing the CO2 emissions and fuel consumption. The aim of this study is to investigate and explain how the solar energy flow affects the fuel economy (FE) and CO2 benefit in a particular hybrid vehicle configuration. The paper starts with the explanation of two different simulation models of a conventional vehicle and a mild hybrid (MH) vehicle along a defined path. A method is defined to estimate the battery state of charge constraint relaxing and then a modified forward model is used to assess solar energy contribution. An analysis of the three models (conventional, MH and solar mild hybrid) along a federal urban driving schedule (FUDS) is presented to compare the correct behavior of the models to follow a defined path and the improvements in terms of FE and CO2 emissions obtained via solar hybridization.
关键词： control,mild hybridization,solar cars,design,simulation,hybrid vehicles
更新于2025-09-12 10:27:22
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Processing Parameters Influence on Microhardness in Laser Metal Deposited Titanium Alloy using Design if Experiment
摘要： Laser Metal Deposition (LMD) is an additive manufacturing process for producing complex parts directly from the Computer Aided Design (CAD) model of the part and for repair of an existing worn out part. The LMD process is governed by processing parameters: laser power, gas flow rate, powder flow rate and scanning speed that influence the microhardness produced during the LMD process. In this study, statistical design of experiment to was employed to investigate the influence of processing parameters on the microhardness of laser metal deposited of Ti6Al4V powder on Ti6Al4V substrate. Full factorial design was used in this study because of its ability to capture the main effects and possible interaction effects of these processing parameters. Each processing parameters was set at low and high values and a total of sixteen (16) experiments was performed and the microhardness of each sample was measured and analyzed.
关键词： Laser Metal Deposition,Titanium alloy,Processing parameters,Microhardness,Full factorial design
更新于2025-09-12 10:27:22
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An algorithm for designing a cooling system for photovoltaic panels
摘要： Solar energy is an abundant source of energy for generating electricity. One of the main challenges in using solar energy is that solar photovoltaic (PV) panels are typically used in regions where solar radiation is high; consequently, the temperature of the panels will increase, and the efficiency of the panels will decrease. Adding cooling tubes to the PV panel is a possible approach to cool it down. To design such cooling systems, CFD simulations may be used; however, this approach tends to be time-consuming. In this paper, we report a new algorithm for designing straight cooling tubes. The algorithm can be used to determine important design parameters such as tube center-to-center length, diameter of the tube, and the minimum tube length needed to achieve a desired outlet temperature. The accuracy of the algorithm was tested using real-world data (including various ambient temperatures and solar radiations) and the maximum temperature difference between desired outlet temperature and CFD simulation for the designed cooling system was found to be 1.7oK.
关键词： Solar energy,Conjugated heat transfer,Design algorithm,Renewable energy,PVT,Cooling system
更新于2025-09-12 10:27:22
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Optimization of process parameters during laser cutting of Ni-based superalloy thin sheet using response surface methodology
摘要： The present investigation deals with the modeling and optimization of multiple quality characteristics of kerf geometry during pulsed Nd: YAG laser cutting of nickel based superalloy thin sheet along the straight cut profile. Top kerf deviation and kerf taper are considered as quality characteristics. These laser cut quality characteristics are the functions of four input parameters are namely: lamp current, Pulse duration, Pulse repetition rate and Scanning speed. Box-Behnken design (BBD) based experiments have been conducted to obtain experimental results of cut quality characteristics for the study. The experimental results have been analyzed for developing models and optimizing the responses using response surface methodology (RSM).
关键词： Box-Behnken design,laser cutting,Response surface methodology,superalloy sheet
更新于2025-09-12 10:27:22