Experience-Based Access Control in UbiComp: A New Paradigm

Experience is a sociological concept and builds over time. In a broader sense, the human-centered equivalents of experience and trust apply to D2D interaction. Ubiquitous computing (UbiComp) embeds intelligence and computing capabilities in everyday objects to make them effectively communicate, share resources, and perform useful tasks. The safety of resources is a serious problem. As a result, authorization and access control in UbiComp is a significant challenge. Our work presents experience as an outcome of history (HI), reliability (RL), transitivity (TR), and Ubiquity (UB). This experience model is easily adaptable to a variety of self-regulating context-aware access control systems. This paper proposes a framework for Experience-Based Access Control (EX-BAC) with all major services provided by the model. EX-BAC extends attribute-based access control. It uses logical device type and experience as context parameters for policy design. When compared with the state-of-the-art, EX-BAC is efficient with respect to response time.

Event-triggered sampling and fault-tolerant control co-design based on fault diagnosis observer

A co-design scheme of event-triggered sampling mechanism and active fault tolerant control(FTC) is developed. Firstly,a fault diagnosis observer is designed to estimate both the fault and the state simultaneously by using the event-triggered sampled output. Some H∞constraints between the estimation errors and the event-triggered sampling mechanism are established to ensure the estimation accuracy. Then, based on the constraints and the obtained fault information, an event-triggered detector and a static fault tolerant controller are co-designed to guarantee the stability of the faulty system and to reduce the sensor communication cost.Furthermore, the problem of the event detector and dynamic FTC co-design is also investigated. Simulation results of an unstable batch reactor are finally provided to illustrate the effectiveness of the proposed method.

An Internet-enabled Integration of Concurrent Engineering with Co-design

In this paper,the Web-based integration methodology and framework have been developed to facilitate collabora- tive and concurrent engineering design in distributed manufacturing environments.The distributed concurrent engineering and co- design are discussed as key components in the mechanism.The related integration system is presented,which includes four function- al modules:co-design,Web-based visualization,manufacturing analysis and look-up service.It can be used for a design team geo- graphically distributed to organize a collaborative and concurrent engineering design effectively.In particular,the collaborative mechanism incorporated with Java-based and Internet-enabled technologies can generate extended strategies for design and planning. Thus,the proposed integration architecture enables the system to be generic,open and scalable.Finally,for the trend of global manufacturing,a case study of Internet-enabled collaborative optimization is introduced and a discussion on teamwork capability is made.

Broadband Sequential Load-Modulated Balanced Amplifier Using Coupler-PA Co-Design Approach

The basic theory of the sequential load-modulated balanced amplifier(SLMBA)is introduced and the working principle of its active load modulation is analyzed in this paper.In order to further improve the performance of the SLMBA,a codesigned method of the coupler and power amplifier(PA)is proposed,which is different from the traditional design of couplers.According to the back-off point and saturation point of the SLMBA,this coupler-PA codesign approach can make the working state of the coupler and three-way PA closer to the actual situation,which improves the overall performance of the SLMBA.The maximum output power ratio of the control PA and the balance PA is then determined by the preset output power back-off(OBO)of 10 dB,and the phase compensation line is determined by the trace of the load modulation impedance of the balanced PA.In order to verify the proposed method,an SLMBA operating at 1.5–2.7 GHz(57%relative bandwidth)is designed.The layout simulation results show that its saturated output powers achieve 40.7–43.7 dBm and the small signal gains are 9.7–12.4 dB.Besides,the drain efficiencies at the saturated point and 10 dB OBO point are 52.7%–73.7%and 44.9%–59.2%respectively.

Inclusive Architecture:Digital Technologies,Co-design and Qualification of the Project Process

This article presents the scenario of programming use by architects and engineers,creating their own unique tools.The goal is to emulate and understand the phenomenon of Building Information Modeling(BIM)software customization by developing plug-ins that can explore the human-environment relationship.Demonstrate the process for building a plugin that seeks to equalize the theory of accessibility technical standards,visually impaired and architects.Use Design Science Research methodologies to guide the construction of artifacts for specific practical problems and the Collaborative Design/Co-design to understand and know the users’expertise.It is argued that the low quality of projects that include elements for the orientation of the visually impaired in Brazil is often related to an unstructured methodology in which important aspects such as the real needs of this group and the human-environment relationship are neglected.

Kinetic Energy Harvesting Toward Battery-Free IoT:Fundamentals,Co-Design Necessity and Prospects

Energy harvesting(EH)technology is developed with the purpose of harnessing ambient energy in different physical forms.Although the available ambient energy is usually tiny,not comparable to the centralized power generation,it brings out the convenience of onsite power generation by drawing energy from local sources,which meets the emerging pow⁃er demand of long-lasting,extensively-deployed,and maintenance-free Internet of Things(IoT).Kinetic energy harvesting(KEH)is one of the most promising EH solutions toward the realization of battery-free IoT.The KEH-based battery-free IoT can be extensively deployed in the smart home,smart building,and smart city scenarios,enabling perceptivity,intelli⁃gence,and connectivity in many infrastructures.This paper gives a brief introduction to the configurations and basic principles of practical KEH-IoT systems,including their mechani⁃cal,electrical,and computing parts.Although there are already a few commercial products in some specific application markets,the understanding and practice in the co-design and optimization of a single KEH-IoT device are far from mature,let alone the conceived multia⁃gent energy-autonomous intelligent systems.Future research and development of the KEHIoT system beckons for more exchange and collaboration among mechanical,electrical,and computer engineers toward general design guidelines to cope with these interdisciplinary en⁃gineering problems.

Co-design in Public Spaces for Children:The Design Process of a Pocket Park

The active participation of users in the Design Process(DP)in architecture is a collective action,which aims to meet their real needs.In terms of open spaces for children,squares and playgrounds become leisure spaces known for being places of coexistence,interaction and entertainment.However,the vast majority of children’s environments are planned and organized considering the perceptions and experiences of adults.Children become absent from the process of building the contemporary city.Co-design is an important tool for adding users to DP.The objective of this work is,therefore,to include children in the DP of a Pocket Park,using methods and tools to support co-design.The work was structured based on bibliographic review,Focus Group,Culture Maker and Digital Fabrication.The research indicated that the collaborative project promotes assertive communication between children and designers,welcoming their ideas and perceptions in a flexible way.

An FPGA-Based HOG Accelerator with HW/SW Co-Design for Human Detection and Its Application to Crowd Density Estimation

Human detection is important in many applications and has attracted significant attention over the last decade. The Histograms of Oriented Gradients (HOG) as effective local descriptors are used with binary sliding window mechanism to achieve good detection performance. However, the computation of HOG under such framework is about billion times and the pure software implementation for HOG computation is hard to meet the real-time requirement. This study proposes a hardware architecture called One-HOG accelerator operated on FPGA of Xilinx Spartan-6 LX-150T that provides an efficient way to compute HOG such that an embedded real-time platform of HW/SW co-design for application to crowd estimation and analysis is achieved. The One-HOG accelerator mainly consists of gradient module and histogram module. The gradient module is for computing gradient magnitude and orientation;histogram module is for generating a 36-D HOG feature vector. In addition to hardware realization, a new method called Histograms-of-Oriented-Gradients AdaBoost Long-Feature-Vector (HOG-AdaBoost-LFV) human classifier is proposed to significantly decrease the number of times to compute the HOG without sacrificing detection performance. The experiment results from three static image and four video datasets demonstrate that the proposed SW/HW (software/hardware) co-design system is 13.14 times faster than the pure software computation of Dalal algorithm.

Co-Design and Trust in Social Network’s Websites

This research is focused on internet shoppers co-design, individual tendency of trust, trust belief, and purchase intention. An online questionnaire was set out in survey form on Google Docs in or-der to collect data. The survey was conducted of participants in Mongolia. 236 usable responses were obtained from Mongolian potential customers in order to examine constructs. The findings suggest that co-design and individual tendency of trust have significant positive effect on the trust levels throughout intention to purchase.

Routing and scheduling co-design for holistic software-defined deterministic network

As a result of the growing complexity of industrial Internet applications,traditional hardware-based network designs are encountering challenges in terms of programmability and dynamic adaptability as they struggle to meet the real-time,high-reliability transmission requirements for the vast quantities of data generated in industrial environments.This paper proposes a holistic software-defined deterministic network(HSDDN)design solution.This solution uses a centralized controller to implement a comprehensive software definition,ranging from the network layer down to the physical layer.Within the wireless access domain,we decouple the standard radio-frequency modules from baseband processing to realize a software-defined physical layer,which then allows us to adjust the data transmission cycles and tag the trigger rates to meet demand for low-power,high-concurrency transmission.Within the wired network domain,we integrate software-defined networking with time-sensitive networking and propose a coordinated design strategy to address routing and the deterministic scheduling problem.We define a set of constraints to ensure collaborative transmission of the periodic and aperiodic data flows.To guarantee load balancing across all paths and timeslots,we introduce the Jain’s fairness index as the optimization objective and then construct a nondeterministic polynomial-time(NP)-hard joint optimization problem.Furthermore,an algorithm called Tabu search for routing and scheduling with dual-stages(TSRS-DS)is proposed.Simulation experiments demonstrate the effectiveness of the proposed HSDDN architecture.

Research on railway BIM platform framework based on homemade graphics engine

At present,BIM platforms rely on foreign software.Homemade software and industry applications are mostly secondary developments,which present stranglehold problems caused by interruptions to the software supply.To solve the problem,key technical research on the 3D integrated design of railway engineering was stuedied based on homemade graphics engines to propose an innovative railway BIM platform framework.The entire process was completed from the top-level design to the engineering verification of the platform.The co-designed mechanism of a"center model and link"hybrid mode was constructed,which solved the difficulties of data management and increment synchronization at a large scale,achieving teamwork among surveying and mapping,alignments,and bridges.The results of this study could provide strong support for the development of BIM software for a whole railway and all majors.

浅谈SoC设计中的软硬件协同设计技术

集成电路制造技术的迅速发展已经可以把一个完整的电子系统集成到一个芯片上即所谓的系统级芯片 (Sys tem on Chip ,简称SoC)。传统的设计方法是将硬件和软件分开来设计的 ,在硬件设计完成并生产出样片后才能调试软件。本文介绍了针对于系统级芯片设计的软硬件协同设计技术 (co design)的概念和设计流程 。

椭圆曲线点乘算法的软硬件协同设计研究

椭圆曲线密码体制是一种基于代数曲线的公开密码体制,其中曲线的点乘速度决定了该密码体制的速度。以NiosII为核心的SOPC技术的发展代表了半导体和嵌入式系统的发展方向。文章在NiosII处理器上对椭圆曲线点乘算法给予了实现,并给出与8051单片机环境实现的速度比较分析,最后使用软硬件协同设计的方式进一步提高椭圆曲线点乘速度。

Formation-Containment Control Using Dynamic Event-Triggering Mechanism for Multi-Agent Systems

The paper proposes a novel approach for formationcontainment control based on a dynamic event-triggering mechanism for multi-agent systems.The leader-leader and follower-follower communications are reduced by utilizing the distributed dynamic event-triggered framework.We consider two separate sets of design parameters:one set comprising control and dynamic event-triggering parameters for the leaders and a second set similar to the first one with different values for the followers.The proposed algorithm includes two novel stages of codesign optimization to simultaneously compute the two sets of parameters.The design optimizations are convex and use the weighted sum approach to enable a structured trade-off between the formation-containment convergence rate and associated communications.Simulations based on non-holonomic mobile robot multi-agent systems quantify the effectiveness of the proposed approach.

A Novel Attribute-Based Encryption Approach with Integrity Verification for CAD Assembly Models

Cloud manufacturing is one of the three key technologies that enable intelligent manufacturing.This paper presents a novel attribute-based encryption(ABE)approach for computer-aided design(CAD)assembly models to effectively support hierarchical access control,integrity verification,and deformation protection for co-design scenarios in cloud manufacturing.An assembly hierarchy access tree(AHAT)is designed as the hierarchical access structure.Attribute-related ciphertext elements,which are contained in an assembly ciphertext(ACT)file,are adapted for content keys decryption instead of CAD component files.We modify the original Merkle tree(MT)and reconstruct an assembly MT.The proposed ABE framework has the ability to combine the deformation protection method with a content privacy of CAD models.The proposed encryption scheme is demonstrated to be secure under the standard assumption.Experimental simulation on typical CAD assembly models demonstrates that the proposed approach is feasible in applications.

Efficient Hardware/Software Implementation of LPC Algorithm in Speech Coding Applications

The LPC “Linear Predictive Coding” algorithm is a widely used technique for voice coder. In this paper we present different implementations of the LPC algorithm used in the majority of voice decoding standard. The windowing/autocorrelation bloc is implemented by three different versions on an FPGA Spartan 3. Allowing the possibility to integrate a Microblaze processor core a first solution consists of a pure software implementation of the LPC using this core RISC processor. Second solution is a pure hardware architecture implemented using VHDL based methodology starting from description until integration. Finally, the autocorrelation core is then proposed to be implemented using hardware/software (HW/SW) architecture with the existing processor. Each architecture performances are compared for different data lengths.

Overview of Co.Design Approach to RF Filter and Antenna

The filter and antenna are two key components of the radio frequency(RF)front-end.When the antenna is directly connected with the filter,additional mismatch losses will be caused.Therefore,the antenna and filter are integrated into a single device to provide both filtering and radiating functions.In this way,many advantages,like low cost,light weight,small size and lower insertion loss can be obtained.In this paper,the co-design approaches of RF filter-antenna are reviewed.Based on the open literatures,the integrated approaches of filtering antenna can be classified into five main categories:1)Co-design by optimizing the interfacing impedance,2)co-design according to the synthesis approach of filter,3)co-design by embedding novel resonators within the feeding structures,4)co-design by employing auxiliary physical structures,and 5)other methods.The RF filter-antenna system can improve the integration degree of RF frontend,reduce its size and cost,and optimize its performance.

Challenging Excessive Fashion Consumption by Fostering Skill-Based Fashion Education

Academic arguments that fashion consumption habits need to change in order to support a more sustainable future are well established.This work explores a participatory design dress making methodology as a vehicle to trigger positive change in younger fashion consumers and help stem an attraction to fast fashion products.A key outcome of the study is that engagement in garment design and construction invoked an apparent pos-itive emotional attachment not typically evident in fast fashion purchases.Participants demonstrated positive attitudes towards sustainability,along-side an awareness of the negative impact of fashion waste.However,at a relatively young age their evolving consumer habits show them to be drawn into the social drivers that are inherent in the idea of fast fashion.The perceived value of the work is the willingness of the students to participate.The apparent satisfaction they felt in their achievements and most significantly,their enthusiasm to continue with making.If this same enthusiasm could be captured in a new imagining of fashion and retailing the values of quality,longevity and individuality can remerge as the fash-ion ideal.

Inclusive Architecture:Landscape Codesign in Children’s Playgrounds

Children’s playgrounds are open spaces,the basis for children’s recreation,important for the inclusion and mobility of visually impaired children in the social environment,through inclusive urban facilities that stimulate new experiences for their cognitive development.In this context,the use of co-design with visually impaired people,in the design processes of children’s playgrounds,assumes an importance for an inclusive project based on their experiences.Thus,it aimed to promote a project together,to provide more comfort and safety to users.It presents as main results as better colors,materials and types of toys for children with visual impairment to be competent in a playground including from the application of methods,tools and resources in the co-design process.

Virtual Simulation Experiment Teaching Platform Based on 3R-4A Computer System

Virtual simulation experiment teaching gradually becomes the trend of the computer-related education practice.Through analyzing the problems existed in current computer experiment teaching,this paper proposes the idea of building virtual simulation experiment platform based on 3R-4A computer system and clarifies the design technology,including frame,characteristic and innovation,resource sharing and management,condition protection and so on.