bluuebunny/crossref_metadata_2025 huggingface dataset:
An Augmented Reality U-Academy Module: From Basic Principles to Connected Subjects
Authors: Menezes Paulo
Published: July 2017

A module for learning about virtual and augmented reality is being developed under the U-Academy project. The module is composed of three parts. The first part is an introduction to the basic concepts of virtual and augmented reality with the help of illustrative examples. The second part presents some of the current uses of augmented reality and its prospective use in several areas that range from industry to medicine. The final part aims at those students interested in the insights of this technology by presenting the underlying concepts such as: camera models, computer graphics, pattern detection and pose estimation from inertial sensors or camera images.
A distance-learning Course on Indoor Environmental Comfort in Buildings
Authors: Silva Manuel Gameiro , Pereira Luísa Dias , Carrilho João A. Dias , Neto Joana , Marcelino Maria José , Mateus Mário , Brito Nelson Silva , Pedrosa Sandra
Published: July 2017

A project for the creation and implementation of a distance-learning course on Indoor Environmental Comfort in Buildings (IECB) is presented. This course resulted from a request by Ordem dos Engenheiros (Portuguese engineering professional body) to the University of Coimbra. It was based on the Indoor Environmental Quality (IEQ) course of the Master in Energy for Sustainability and PhD in Sustainable Energy Systems of the University of Coimbra, coordinated by the first author. Jointly with the support of the Distance Education Service of the University of Coimbra, using as a starting point the existing contents of a formal discipline, the teaching methodologies and a set of activities were developed to implement a distance-learning course with a strong e-learning component by the students. Diversified strategies, using the existing platform running on Moodle, such as webinars, virtual laboratories, remote access labs, discussion forums and synchronous sessions, were tested to ensure a dynamic and interested engagement of the students along the course.
The Transformation Model
Authors: King Kathleen P.
Published: July 2017

The journey of transformation is a model of professional development developed, grounded in research of 205 educators, and based on a framework of adult learning begun in 1997. Transformative learning is a theory that describes the experience and cognitive process by which adults critically evaluate previously unexamined beliefs, values, or assumptions; try new beliefs, values, and assumptions to determine the fit for themselves; and then develop a dramatically new perspective of their worldview (Mezirow, 1978). This article describes how the author developed a mixed quantitative and qualitative tool to more broadly gather and analyze data about this experience. The work focuses on two major groups of traditional adult learners: English as second language learners and adult basic education learners. The journey of transformation represents a refinement of the 10-stage transformative learning theory model, one which is dynamic and interactive among the stages. The model emphasizes an environment of support for technology learning and encourages a role for practice and experimentation with technology that recognizes the fluid, nonlinear process of such learning.
CoPs for Cops
Authors: de Laat Maarten , Broer Wim
Published: July 2017

Managing knowledge in large organizations is a challenge in itself. Modern views on Knowledge Management (KM) focus not only on finding ways to capture and distribute corporate knowledge but also provide ways through which knowledge can be shared, discussed and created. Different types of organizations have different approaches to KM. From general descriptions of these approaches, parallels to the Dutch police will be presented. This chapter discusses how KM within the Dutch police is an integral part of the organization and how explicit and tacit knowledge is shared to create new corporate knowledge. The authors present examples of how Communities of Practice (CoPs) within the Dutch police play a role in both sustaining and developing their own practice, and how these communities are crucial to the learning organization.
Legal and Ethical Implications of Employee Location Monitoring
Authors: Kaupins Gundars , Minch Robert
Published: July 2017

This article summarizes the legal and ethical implications associated with employee location monitoring. It states that few international laws and no American laws directly address this location monitoring. International privacy laws and directives, the Electronic Communications Privacy Act, the USA Patriot Act and other laws and directives involving Internet and e-mail monitoring provide the pattern for future location monitoring laws. It also states that ethical considerations such as productivity, security, goodwill, privacy, accuracy, and discipline fairness affect future laws. Furthermore, the authors hope that the understanding of existing laws and ethical considerations associated with electronic monitoring can lead to practical and reasonable location monitoring policies. Employer and employee interests must be balanced. Location monitoring policies should include a legitimate business purpose, ensure that employees are notified that they are being monitored, provide for adequate storage and dissemination of monitoring data, and provide for consistent evaluation of monitoring effectiveness.
Towards a New Model of Storage and Access to Data in Big Data and Cloud Computing
Authors: Matallah Houcine , Belalem Ghalem , Bouamrane Karim
Published: July 2017

The technological revolution integrating multiple information sources and extension of computer science in different sectors led to the explosion of the data quantities, which reflects the scaling of vo-lumes, numbers and types. These massive increases have resulted in the development of new location techniques and access to data. The final steps in this evolution have emerged new technologies: Cloud and Big Data. The reference implementation of the Clouds and Big Data storage is incontestably the Hadoop Distributed File System (HDFS). This latter is based on the separation of metadata to data that consists in the centralization and isolation of the metadata of storage servers. In this paper, the authors propose an approach to improve the service metadata for Hadoop to maintain consistency without much compromising performance and scalability of metadata by suggesting a mixed solution between centralization and distribution of metadata to enhance the performance and scalability of the model.
Teaching at the University
Authors: Cartelli Antonio , DeVito Leila
Published: July 2017

The paper reports the results of an investigation on teaching supported by digital equipments in an Italian university. The opportunity for the study arises from the creation of a particular training activity for first employed teachers (called TFA), and it aims at analyzing the teaching styles adopted by professors when the use of digital technologies is proposed to support didactics. Two main results emerge from the collected data: first, most part of professors have a common view of the use of digital technology in teaching, based on the support that tools can give to their work; second, university professors usually have little or no consciousness of the positive influence that virtual environments can have on teaching and how e-learning can help students in autonomously building and develop their knowledge.
Tracing the Development of Touchscreen Education
Authors: Ferri Paolo , Moriggi Stefano
Published: July 2017

After a brief introduction pointing up the technological origins of humankind, in the main body of this paper the authors bring three different levels of analysis to bear on 0-10-year-old children's appropriation of touchscreen technology (in the home, during informal exchanges with peers, and at preschool and primary school). First, they review the most recent literature on the topic, showing that the age of first access to this kind of technology has dropped significantly; this suggests the need to provide a critical education in technology from the early childhood education and preschool stages onwards. Indeed, the data and evidence that is accumulating from home and educational contexts prompts the authors – in the second part of the paper – to revisit Sherry Turkle's classical three-phase model (informed by the work of Papert and Piaget) of how children encounter and relate to “new” digital technologies. Furthermore, the uses that children make of digital devices and the relative cognitive patterns need to be interpreted in light of the epistemological requirements that have driven both the development of these technologies and changes in the dynamics of how they are appropriated. All these levels of analysis are prerequisite to designing educational models that are truly enhanced by the deployment of touchscreen technology. Finally, in the third section of the paper, the authors outline the key principles of their own proposed model – the Bayesian Classroom – based on the theoretical considerations previously outlined.
Computer Generated Description as the Required Digital Competence in Archival Profession
Authors: Rajh Arian , Pavetic Tanja
Published: July 2017

This article examines archival description generated by the archival management software for records creators in Croatia. Authors explain practices with finding aids in records creators and Croatian National Archives institutions. The authors outline the creation and linking of ISAD(G) and ISAAR (CPF) descriptions in the tool-supported practice. The automated creation of an inventory in a human-readable form of “classical” printable finding aid as well as in the EAD3 1.0 XML form is also explained in the article. In the end, considering the significance of finding aids for records and archival management abilities, as well as for information and knowledge sharing abilities of records creators and institutions with archival holdings, the authors propose a maturity model for those institutions based on automation and usability of their finding aids.
Flipped Inclusion, Between Theoretical and Experimental Didactics
Authors: De Giuseppe Tonia , Corona Felice
Published: July 2017

Flipped Inclusion stems from epochal assumptions and has been created to manage, in a simple and ecological way, the world's complex societies. It uses new instrumental approaches to knowledge and their media advantage. The need for an ecological perspective of development, determined by the recognition of a basic awareness of the unique individual, is the result of a series of relations and relationships that emerge from the multi-perspective contrived as well as utilitarian certainties that are typical of the misleading consumerist multi-perspective societies. Through computational and logical inferences as well as semantic and symbolic recognition, the Flipped Inclusion establishes itself as an ethical socio-educational model based on three points: self-esteem, promptness and community/institutions. It is appropriate for social development and is multidimensional and multi-relational for everyone. Flipped Inclusion transforms data into ontology and at the same time converts inter-subjectivity in relation, re-shaping both sense and context.
Towards a Telehomecare in Algeria
Authors: Zarour Karim
Published: July 2017

Most developing countries are generally characterized by some problems such as limited resources and professional isolation in the health area. Information and Communication Technology (ICT) is supposed to give solutions through the use of e-Healthcare technologies. Information and communication technologies are valuable tools used to establish and maintain connections within and between healthcare providers, and between healthcare providers and Patients. Telehomecare evolves constantly. It can aid disabled persons, increase patient compliance, enhance caregivers' effectiveness, and connect socially isolated individuals to their care providers. Various research works have investigated different aspects of ICT in the context of telehomecare in some developed and developing countries. This paper describes an architectural framework for the development of telehomecare in Algeria for diabetes measurement and remote monitoring.
A Confrontation of Lattice Boltzmann, Finite Difference and Taguchi Experimental Design Results for Optimizing Plasma Spraying Operating Conditions Toward Deposit Requirements
Authors: Djebali Ridha
Published: July 2017

The aim of the present work is the confrontation of three numerical techniques results to optimize the operating conditions of thermal plasma spraying process. The Lattice Boltzmann method (LBM) is used to scrutinize dispersion effects of injection parameters on droplet impact characteristics when impacting substrate. The validation of the developed model shows good agreement with former findings. The results of spraying Zirconia particles give the values Kmin=88.2, Kmax=367.4, Kmean=273.8 and a standard deviation of 48.0 for the Sommerfeld number. The Taguchi experimental design study is conducted for five operating parameters of two levels. The ensuing retained factors combination give Kmean=258.9. To assess drawn conclusions, confirmation test was performed using the Jets&Poudres software. The results show that the prior way is to coat and particles of dp< 40.3 µm have evaporated, particles 40.3 = dp = 49 µm are fully molten and all particles of dp = 71.9 µm arrive fully solid.
Navigating an Immersive Narratology
Authors: Wiggins Bradley E.
Published: July 2017

In direct response to the rise in fake news as a socio-cultural and political phenomenon, this article presents an analysis of the factors that may help to explain the reception of fake news. In addition, recent pronouncements made by the Trump White House seem to challenge the nature of an objective truth. An immersive narratology emphasizes that different universes of discourse can intermingle and overlap, with fact and fiction becoming difficult to distinguish in our increasingly mediated lives. A tenable definition of fake news is offered prior to exploring historical antecedents of fake news. Persuasion, construction, immersion, distribution, and polarization represent the core factors that demystify the reception of fake news regardless as to whether an individual believes a story. A concluding discussion offers a critical evaluation of the potential of fake news to augment the news media landscape in the coming years.
The Pervasive and the Digital
Authors: O'Brien Daniel Paul
Published: July 2017

This paper discusses two immersive story worlds between two distinct interactive artworks. Blast Theory's A Machine to See With (2010) is a pervasive fictional experience that enables users, through the technology of their mobile phone, to become immersed within a fictional crime scenario across a real geographical setting. Dennis Del Favero's art project, Scenario (2011), by contrast, is an interactive and immersive story that takes place in a 360-degree digital cinematic space called an AVIE (Advanced Visualization and Interaction Environment). This immersive world is a mixed reality environment, a meeting place where five real users and ten digital screen characters converge and interact through the technology of motion sensing. Participants are virtually wired into the immersive world through the performance of their movement. This paper will explore both of these artworks through original interviews the author has conducted with each of the artists.
Assessing Utilization and Effectiveness in Public Participative and Volunteered Geographic Information Systems for Environmental Data
Authors: Moreno April , Osailan Sarah
Published: July 2017

Geographic Information Systems (GIS) can serve as a planning tool to promote community health at many levels, such as the policy, organizational and public levels. The Brownfields to Healthfields (B2H) program involves creating new opportunities to support community public health, including the development of park spaces and new hospital facilities. However, there was no existing portal for organizations to access a map of brownfields data to meet the required criteria of the organization in seeking a space for transformation to a “healthfield” or other public services facility. Since the various types of community and demographic data were scattered, it was necessary to combine the data in a web application available to all stakeholders. This paper discusses the utilization of a new concept of operation, which includes participative and volunteered approaches that are addressed to include the contribution of various stakeholder groups, and to further improve planning for public health.
Learning Programming Technique through Visual Programming Application as Learning Media with Fuzzy Rating
Authors: Buditjahjanto I.G.P. Asto , Nurlaela Luthfiyah , Ekohariadi  , Riduwan Mochamad
Published: July 2017

Programming technique is one of the subjects at Vocational High School in Indonesia. This subject contains theory and application of programming utilizing Visual Programming. Students experience some difficulties to learn textual learning. Therefore, it is necessary to develop media as a tool to transfer learning materials. The objectives of this study are to determine the feasibility of learning media based on Visual Programming and to investigate the response of students who utilize the learning media. Learning media is firstly validated by experts before it is applied to students. This research implemented rating validation with fuzzy rating based on fuzzy inference system. Fuzzy benefits in translating a crisp form into the preference of linguistic variable form and reprocess into a crisp form as a value decision. The results revealed that fuzzy rating can be implemented to measure the feasibility of learning media and students' responses to the use of learning media.
iPads in the Classroom
Authors: Ferguson Janet M. , Oigara James N.
Published: July 2017

In education, new technologies are used to improve the process of teaching and learning. This study examined middle school teachers' perceptions regarding the use of iPads for instruction. The participants, 53 middle school teachers in Western New York, responded to an online survey, asking them questions about how they felt about the 1:1 iPad initiative at their school. Data analysis included open and axial coding for identification of themes and patterns, as well as quantitative statistical analysis. The results showed mixed findings, as some teachers believed that iPads had a positive impact on the teaching-learning process by improving student engagement and communication, while some responded with concerns that iPads caused student distraction and allowed off-task behaviors in the classroom. The findings also suggest that teachers need targeted professional development on pedagogical and practical use of this technology to be able to successfully integrate it into their practice.
Synchronous Office Hours in an Asynchronous Course
Authors: Gibbons-Kunka Beatrice
Published: July 2017

The notion of synchronous office hours in an asynchronous course seems counterintuitive. After all, one of the tenets of asynchronous education is to not require students to be online and participating at any time during the course. Having taught higher education online asynchronous courses for twenty years, the researcher experimented with online synchronous office hours as a means of making a connection with her online doctoral students. This paper outlines the challenges, benefits and best practices of incorporating a synchronous element into an otherwise purely asynchronous environment. Additionally, it offers strategies to enhance communication between students and the professor, as well as developing a community of learners in the asynchronous classroom.
Using Eye Tracking as a Tool to Teach Informatics Students the Importance of User Centered Design
Authors: Gelderblom Helene , Adebesin Funmi , Brosens Jacques , Kruger Rendani
Published: July 2017

In this article the authors describe how they incorporate eye tracking in a human-computer interaction (HCI) course that forms part of a postgraduate Informatics degree. The focus is on an eye tracking assignment that involves student groups performing usability evaluation studies for real world clients. Over the past three years the authors have observed how this experience positively affected students' attitude towards usability and user experience (UX) evaluation. They therefore believe that eye tracking is a powerful tool to convince students of the importance of user centered design. To investigate the soundness of their informal observations, the authors conducted a survey amongst 2016 HCI students and analysed student course evaluation results from 2014 to 2016. The findings confirm that students regard the eye tracking assignment as a mind altering experience and that it is potentially an effective tool for convincing future IT professionals of the importance of usability, UX and user centered design.
Online Advertising
Authors: Behboudi Mehdi , Koshksaray Amir Abedini
Published: July 2017

This study expands previous models of avoidance on online advertising, in particular, Cho and Cheon (2004)'s model, and examines two new dimensions on why people avoid advertising on the Internet. The study presents a comprehensive theoretical model and examines seven exogenous latent variables based on structural equation modeling, SEM. By using SEM the authors found that seven latent variables including user-perceived ad quality, internet life style, primary motives, gender differences (initial ad avoidance), perceived ad clutter, prior negative experience, and perceived goal impediment (further ad avoidance) collectively explain why people avoid advertising on the Internet. The authors found that avoidance has two key dimensions «initial ad avoidance» and «further ad avoidance.”
Internet Advertising Pleasure and Purchase Intention
Authors: Koshksaray Amir Abedini , Nabizadeh Elnaz
Published: July 2017

The purpose of this study is to provide some insights regarding the Internet advertising Pleasure, IAP. The recent negative trends and deficiencies in Internet advertising makes it imperative to study various factors affecting this area of marketing and explain why people have not enough willingness to click on advertisements. This study builds a comprehensive theoretical model explaining the internet advertising pleasure. By administrating a survey, the paper examined the 288 Internet users' reactions in Iran. A structural equation model and AMOS software were used to analyze the data. A total of five latent variables of internet advertising pleasure were examined: prior experience, website pleasure (attitude toward website), and arousal as antecedents; and attitude toward brand and purchase intention as consequences. The paper found that regardless of “Website pleasure” and “Arousal,” these constructs successfully explain Internet advertising pleasure by incorporating advertising relaxedness, advertising happiness, and advertising satisfaction. The prior experience was found to be the most significant for explaining Internet advertising pleasure. This study offers one of the first attempts to build a comprehensive theoretical model explaining Internet Advertising Pleasure, IAP. Second, this study offers a new scale for internet advertising pleasure with higher content validity.
A Survey on Denial of Service Attacks and Preclusions
Authors: Nagesh K.  , Sumathy R.  , Devakumar P.  , Sathiyamurthy K.
Published: July 2017

Security is concerned with protecting assets. The aspects of security can be applied to any situation- defense, detection and deterrence. Network security plays important role of protecting information, hardware and software on a computer network. Denial of service (DOS) attacks causes great impacts on the internet world. These attacks attempt to disrupt legitimate user's access to services. By exploiting computer's vulnerabilities, attackers easily consume victim's resources. Many special techniques have been developed to protest against DOS attacks. Some organizations constitute several defense mechanism tools to tackle the security problems. This paper has proposed various types of attacks and solutions associated with each layers of OSI model. These attacks and solutions have different impacts on the different environment. Thus the rapid growth of new technologies may constitute still worse impacts of attacks in the future.
Inside the Black Box
Authors: Resende David Nunes , Yu Xiaowen , Gaia Sílvia , Gibson David V.
Published: July 2017

This article uses an original three-phase approach for empirical assessment and comparative evaluation of the efficiency of university technology transfer. It is based on analysis of inputs and outputs of a disclosure phase followed by a value-add phase and a final license phase, using a multidimensional framework. The objective is to find university Technology Transfer Office (TTO) efficiency and effectiveness patterns for each phase as well as overall TT processes. A network Data Envelopment Analysis (DEA) model was used to analyze and describe the complicated TT operational processes using Association of University Technology Managers data collected from 90 US university TTOs for the period 2007-2013. It was concluded that the sampled TTOs were most inefficient in their value-add (2nd) phase and that the average overall efficiency as well as the efficiency of disclosure (1st) and license (3rd) phases decreased during the last five years of data analyzed. In addition, in line with other studies, analysis supports the contention that the presence of medical school does not increase TT efficiency or effectiveness. The present research's contributions focus on three areas: (1) Analysing and modelling TTO valorization and commercialization process with a UML activity diagram to provide a clear picture of TT procedures and processes; (2) Proposing a three-phase DEA framework showing input/output indicators closely related to each phase of processes rather than a black box or separated activities; (3) Offering a strategy to conduct empirical studies on TTO's operational efficiency thereby helping to better understand future research operational problems.
The Immense Potential of M-Care in India
Authors: Rana Ajay
Published: July 2017

A significant fact must be underlined to understand the potential of M-health in India: the poorest sections of the populations have mobile phones, but not always access to clean water. While this may seem unfortunate, this reflects the immense potential and readiness of the population for newer approaches and modes of access to healthcare. In fact, digital healthcare platforms have sprouted in the last couple of years, seeking to supply sophisticated services to a broad number of citizens. While the advances in M-health care in India are relatively new, the future is extremely promising and services are growing in this direction. With a population of over one billion and three hundred, opportunities for new ideas and new systems to benefit a multitude of patients are manifold.
Mobile Health Literacy to Improve Health Outcomes in Low-Middle Income Countries
Authors: Vaz Nafisa Fatima Maria
Published: July 2017

Despite improvements in health indicators over time, such as decreased mortality and morbidity, significant challenges remain with regard to the quality in the delivery of healthcare in low and middle-income countries (LMIC's), especially in rural and remote regions of developing countries.In the effort to find feasible solutions to these issues, a lot of importance is given to the information and communication technologies (ICTs) The author reviews the evidence of the role mobile phones facilitating health literacy to contribute to improved health outcomes in the LMIC's. This was done by exploring the results of ten projects. The author examines the extent to which the use of mobile phones could help improve health outcomes in two specific ways: in improving health literacy and promoting health and well-being, thus increasing life expectancy in LMIC's. Analysis of the papers indicates that there is important evidence of mobile phones boosting increased access, promoting education and increased health literacy leads to the better health status of the population.
Designing the Partially Porous Journal Bearings of an Aerostatic Spindle
Authors: Huang Te Yen , Shen Song Chiang , Hsu Shao Yu
Published: July 2017

The aerostatic journal bearings are widely used in ultra-precision machine tools. Due to remarkable ability of the porous medium in flow restriction, the porous aerostatic journal bearings are better than other types of aerostatic bearings in load carrying capacity, stiffness, damping and dynamic stability. The partially porous aerostatic journal bearing has the advantages of easy production and low cost. Moreover, the gap between the porous insert and the spindle can be adjusted to reduce the eccentricity due to high speed rotation. In this study, the effects of the size of the porous insert and the thickness of the air gap between the spindle and the housing on the gap pressure, the stiffness and the load carrying capability of the partially porous aerostatic journal bearing were figured out for performance evaluation.
The Application of Laser-Generated Ultrasound Technology in Coating-Substrate Systems
Authors: Xu Zhi Xiang , Guo Hai Yang
Published: July 2017

Based on thermo-elastic regime, ultrasound can be generated by modulated laser pulse. When laser-generated ultrasound technology is applied to measure the thickness of coating and study the coating characters, even analysis the effects of coating during detecting the cracks and voids of the substrate, it is shown that it’s a very efficiency technology. When measuring the coating thickness, it can control the accuracy scope at the nanoscale; the relative error is under 2% for single layer coating, under 10% for double layer coating. As to coating characters, for example, Young modulus, Poisson's ratio etc, according to BP Neural network algorithm, use the nonlinear map relationship between material parameter and laser generated ultrasound wave forms to get these coating characters reversal. Studying the dispersion characteristic of the coating-substrate system can analysis effects of coating to defects detecting that coating absorbs large energy which leads to faster heat conduction speed than uncoated sample, but have smaller surface wave amplitude. All these are shown that laser-generated ultrasound technology can realize high-precise measurement and have an extensive use in the field of nondestructive testing.
Machining Allowance Optimal Distribution of Thin-Walled Structure Based on Deformation Control
Authors: Chen Yu Zhi , Chen Wei Fang , Liang Rui Jun , Feng Ting
Published: July 2017

Multilayer cutting is widely used in finish machining process of thin-walled parts to improve the machining precision. The paper presents a cutting allowance optimization method using genetic algorithm to improve the machining quality and efficiency of thin-walled parts in the field of aerospace. Considering the coupling relationship of the deformation between the layers in layered milling, the parameterized finite element model of thin-walled parts in side milling process is established. The best relationship between the workpiece stiffness and the cutting force is determined though iterative calculations, and the deformation caused by the cutting force can be minimized. The results show that the optimized distribution of the depth of finishing cutting was better than the experience. The method proposed in this paper can reduce the deformation of the workpiece during the machining process, and thus improve the machining accuracy.
Experiments on Electrochemical Micromachining with Ultra-Short Pulse Current
Authors: Li Xiao Hai , Xue Bei Bei , Wang Shu Ming , Zhao Li Jie
Published: July 2017

During electrochemical micromachining (EMM) , materials are removed in the form of ions based on the anodic dissolution mechanism, so it should be a promising technique for micromachining . A new kind of experimental setup of EMM was developed successfully, which is in fact a multifunctional machine tool, and micro-electrode tool can also be fabricated on the same machine tool. The developed experimental setup for EMM consists of feed unit, micro electrode fabrication unit, ultra-short pulse power supply, short circuit detection of machining current and so on. The experiments on micro electrochemical milling (micro EC milling) of typical micro-structure samples by the micro electrode tool rotating like micro milling cutter were carried out. The new feed strategy of micro EC milling was adopted. The comparative process experiments were carried out to explore the machining laws to meet the requirements for micromachining. At optimized parametric combinations, the micro triangle and the micro beam with width of about 50μm were milled on the stainless plate 304 by micro EC milling.
The Trapezoid Counterweight Method in Dynamic Balance of Symmetric Flexible Rotor
Authors: Hui Han , Hao Li Na , Qi Zhang , Xiang Gao
Published: July 2017

Steam turbine generator unit, water pump and other high speed revolution symmetric flexible rotor were regarded as research objects in this paper. According to variation characteristic of rotor shaft in rigid and flexible working mode, nine-reel high pressure water pump rotor was analyzed. The former four-order intrinsic frequency of flexible rotor was obtained by modal analysis and harmonic response analysis. The methods of reaction force response and unbalance response were been studied after first order and second order resonance region eliminating in different modes of simple harmonic exciting force. Based on above theoretical research results, trapezoid counterweight method was proposed for dynamic balance of flexible rotor. This method solved problem that rigid dynamic balance of low speed rotor was destroyed after first order and second order resonance region counter weight in dynamic balance of flexible rotor. The dynamic balancing techniques of flexible rotor could be improved the qualities of rotor and its relative products by this method, eliminating the vibration of unbalance mass of products radically.
Dynamic Modeling and Complexity Analysis of Human Lower Limb under Various Speeds
Authors: Yu Jian , Cao Jun Yi , Li Cheng Guang
Published: July 2017

Human lower limbs are the most important parts of human body due to their supporting the whole body in the process of human motions. There are many pathological joint diseases and accidental damage, such as traffic accident and falling off from high place, influencing the human daily life seriously. Therefore, dynamic model of human lower limb has received considerable interest from multi-disciplines including flexible mechanisms, smart structures, biomechanics and nonlinear dynamics. This paper establishes the simplified simulation model of human lower limb based on the acquired realistic data from human motions under different speeds. The model can not only describe dynamic characteristics of real lower limb but also can be simulated by realistic human lower limb motion excitation acquired by tri-axial accelerometers and inclinometers in different conditions. Consequently, the detailed dynamic information of human lower limb from the proposed model can be obtained. In order to analyze the variability of human motions, multiscale entropy (MSE) is employed to investigate the complexity of human motion signals for different speeds of motion. Motion transition characteristics under different speeds are exhibited for understanding adaptation mechanism of human motion. The results will be helpful for exoskeleton and lower limb rehabilitation robot.
Analysis of Imbalance Calculation Method in Dynamic Balancing Machinery
Authors: Pian Jin Xiang , Pu Chun Yu , Wang Zhan , Qi Yuan Wei
Published: July 2017

The development of dynamic balancing machinery has gradually become mature. Experts and scholars have developed many kinds of actuators, which can achieve dynamic balance. But the imbalance in most dynamic balancing machinery is still obtained by using the influence coefficient method. In this paper, it made an analysis of the influence coefficient method and its improved method. The analysis indicates that, with the limitation of adding trial mass, these methods are mostly used in experimental environment. But for the actual production and processing, the feasibility of the application is not so hot. Therefore, looking for an imbalance calculation method without trial mass is particularly important, which is the development direction of dynamic balance technology in future.
A Research and Design of Intelligent Detecting and Controlling System for Automatic Assembly Force
Authors: Tan Xiao Dong , Qin Lai Chao , Wu Yuan Yuan
Published: July 2017

In this paper, we designed a set of multipurpose intelligent detecting and controlling system for automatic assembly force. To actualize detecting, analyzing and controlling hole-peg assembly force. Firstly, we founded the assembly model, and simulated and analyzed the main factors which make great effect on axial force. We briefly introduced the assembly mechanism, compliant wrist and paw, the functions and operational principles of this system. This system has three detecting modes, users can select one from the three in “mode selection”, and they can also set the parameters. We also designed the hardware and the software. We tested and simulated all the modules for many times to improve their reliability and facticity. At last, we illustrated the anti-jamming measures we took in the design. After all the tests, this system could work well.
Dynamic Modeling and Optimal Design of a Horizontal Machining Center Based on Experimental Modal Analysis
Authors: Huang Yu Bin , Ma Yue , Sun Qing Chao , Sun Wei , Yue Wen Bin , Sun Xin
Published: July 2017

The modeling and optimization of machine tool’s dynamic performance remains to be a grand challenge in machine tool design. In this paper. In order to identifying the concentrated modals of a horizontal machining center, a combined experiment modal analysis method is proposed. A FEA dynamic model accurate in frequency and mode shape is built and verified by comparing with EMA results. Based on the model the optimization of frame structure is made, Simulation results shows the optimized frame enhances the dynamic performance of machine tool.
Concurrent Topology Optimization of Lightweight Cellular Materials and Structures
Authors: Qiao He Ting , Wang Shi Jie , Lv Xiao Ren
Published: July 2017

In this paper, a two-stage optimization algorithm is proposed to simultaneously achieve the optimum structure and microstructure of lightweight cellular materials. Microstructure is assumed being uniform in macro-scale to meet manufacturing requirements. Furthermore, to reduce the computation cost, the design process is divided into two stages, which are concurrent design and material design. In the first stage, macro density and modulus matrix of cellular material are used both as design variables. Then, the optimum topology of macro-structure and modulus matrix of cellular materials will be obtained under this configuration. In the second stage, topology optimization technology is used to achieve a micro-structure of cellular material which is corresponded with the optimum modulus matrix in the earlier concurrent design stage. Moreover, the effectiveness of the present design methodology and optimization scheme is then demonstrated through numerical example.
Preliminary Study of PHM System Based on Data Driven
Authors: Tian Zhi Xing , Wei Zhang , Hao Li Na , Liu Shu Bing , Qu Bing Yin
Published: July 2017

Complex mechanical and electrical equipment contains a large amount of data with the implicit information. According to the development of PHM (Prognostics and Health Management) technology at home and abroad, and the wide application prospects of data driving methods, the overall framework of data driven PHM system for complex electromechanical equipment was designed. The data driven PHM implementation process of the complex mechanical and electrical equipment was described step by step, which provides important theoretical significance and application value for the PHM research of the complex mechanical and electrical equipment. Finally, the development trend and research challenges of data driven PHM method were analyzed.
Thermal Stability Analysis and Optimal Design for a Two-Dimensional Angle Sensor
Authors: Li Rui Jun , Xu Peng , Tang Shuai Tao , Fan Kuang Chao , Huang Qiang Xian , Hu Peng Hao
Published: July 2017

A compact two-dimensional angle sensor with a measurement resolution that exhibits superior sensitivity has been designed based on the autocollimator principle to enable the precision measurement field to measure the pitch and yaw error motions of a moving object. The signal drift of this sensor affects the measured angle and is mainly caused by the change in environmental temperature. To improve the thermal stability of the sensor, computer simulation has been conducted using the finite element analysis software ANSYS 16. Simulation results show that the angle sensor is considerably stable to adopt mechanisms with a symmetrical structure. Thus, a modified optimal angle sensor is developed, and its thermal stability has been verified via contrast experiments. Compared with the original sensor, the average drift of the optimized angle sensor is reduced from 0.430 arcsec∕°C to 0.120 arcsec∕°C when the variation of the environmental temperature is 5 °C. The optimal angle sensor is ideal for high-precision measuring equipment.
Research on Data Acquisition Scheme in PHM System Based on Data Driven
Authors: Wei Zhang , Tian Zhi Xing , Xin Nie , Hao Li Na , Liu Shu Bing , Qu Bing Yin
Published: July 2017

In this paper, a kind of data driven PHM system architecture based on data driven is came up; then a field data acquisition scheme which is very important in PHM system is presented; with a case, the block diagram of the scheme realization, which includes OPC server software configurations, and client software development process is shown. In this case, the data acquisition software has been developed by using the C #language and the local database and the data center database has been created to save data. The data acquisition software can read data from the PLC and save data to the database, which provides a stable and accurate data source for PHM system and has good stability and compatibility.
Damage Monitoring and Analysis of Fiber-Metal Laminates with an Open Hole Using Digital Image Correlation
Authors: Tong An Shi , Xie Li Yang , Bai Xin , Li Ming , Meng Wei Ying
Published: July 2017

Notched fiber-mental laminates are susceptible to damage. Nowadays, damage detection mainly depends on visual inspection and C scan. But the two methods are limited to the technical skill of the inspectors, causing missed detection or even fault detection. This paper devotes to exploring the DIC monitoring technique to assess of the damage process taking place in notched (open hole) specimens under uniaxial tensile loading. Two-dimensional (2D) Digital Image Correlation (DIC) techniques are employed to obtain full-field surface strain measurements of GLARE3-3/2 and GLARE6-3/2 laminate with an open circular hole under tensile loading. Failure modes,damage initiation and progression of notched fiber-metal laminates are characterized and discussed.
The Precise Measurement Technology for Manufacturing Error of Cycloidal Gear Used in RV Reducer
Authors: Zhang Ying Hui , Wang Xiao Yu , He Wei Dong , Zhou Feng , Hao Li Yang
Published: July 2017

According to problems in manufacturing and measuring process of cycloidal gear used in RV reducer, the profile coordinates of cycloidal gear captured by three coordinates measuring instrument Surveying and mapping do not coincide with the designed tooth profile coordinates in theory, it is difficult to precisely capture the addendum and dedendum of each cycloidal gear teeth, furthermore, the captured addendum and dedendum do not coincide with the actual tooth items. For these problems, this paper introduced a method can accurately calculating the manufacturing error of cycloidal gear.Based on the captured coordinate points of cycloidal gear tooth profile, firstly, find out 39 approximate addendums by calculating and comparing the radial radius of all points, divide the whole scanning points into 39 profile points groups by the 39 approximate addendums, with each group include a whole single tooth profile. Then, in each profile points group, interpolate the spline and precisely calculate the addendums and dedendums by fitting and recalculating radial radius.Set up the coordinate system of surveying and mapping profile by the 39 addendums. calibrate the coordinate system of surveying and mapping profile with the new coordinate system through coordinate transformation, calculate the radial runout error at top and root of tooth profile, pitch error, adjacent pitch error and accumulated pitch error as well as other manufacturing errors of the cycloidial gear at last.Through experiment, this process solve the problem in measuring process of cycloidal gear that the captured point by three coordinates measuring instrument could not be directly used for calculating the errors items.
Simulation for the Separation of VDR Voice Signal Base on the Local-Wave Method
Authors: Xu Cun Liang , Wang Xiao Tong , Gai Qiang
Published: July 2017

The Voyage Data Recorder (VDR) is becoming one of the most important equipment of the modern ship, especially for the combat vessel. In the one hand, Many types of data of the combat vessel can be recorded in time and be saved for a long time, which could be benefit for replaying some status or scenes of the vessel on some occasion. On the other hand, For the reason of the complex sources and instability of the data in VDR, It is difficult to separate the VDR voice signal completely, then it is inconvenient for the data retrieval. In this paper, a new method named Local-wave method has been used to resolve the problem in theory, which usually focus on the local feature of the signal. According to the simulation, this method separated the VDR voice signal more effective, and it will be useful to the data retrieve of VDR voice signal.
A Study on Polarization Pattern of Full Moonlight Based on the Neutral Points and the Meridian
Authors: Cui Yan , Zhao Jin Yong , Chu Jin Kui , Guan Le , Zhang Ran
Published: July 2017

In order to provide the theory and experiments for the polarized skylight navigation, the polarization patterns of moonlight were discussed in this paper. The polarization patterns of moonlight were simulated by Matlab based on Rayleigh scattering theory. The polarization patterns of full moonlight were obtained by the full-sky imaging system in clear sky. The neutral point and the meridian contain the distribution characteristics of polarization patterns. Compared the tested results with the theoretical polarization patterns of moonlight, the neutral pointand the meridians of the measured polarization patterns of moonlight were studied. The results showed that the tested polarization patterns of moonlight were in agreement with the theoretical polarization patterns basically.
A Portable Environmental Detection System Based on Multi-Parameter Integration and Virtual Instrument
Authors: Du Xiao Hui , Liu Yuan Hui , Wu Xiong Feng , Yang Chao Ping , Zhu Qing Yuan
Published: July 2017

To realize rapid detection and evaluation of environmental-related information of the outdoor environment, this paper presents a portable environmental information detection system based on multi-sensor integration, wireless communication technology and virtual instrument technology. It can realize real-time detecting and evaluating parameters of air, acoustic, water and soil. Meanwhile, it is also able to record the longitude and latitude value, map and pictures of the location that data acquired. Moreover, modular structure design is adopted in the system, so the data processing modular can be applied in other evaluation systems as an analysis tool. Also, new function modules can also be added in the system to meet the needs of more features.