Natural Finger Interaction for CAD Assembly Modeling

2017 ◽  
Author(s):  
Marius Fechter ◽  
Sandro Wartzack
Keyword(s):  
Future Research ◽  
Prototype System ◽  
Assembly Modeling ◽  
Know How ◽  
Detection Algorithms ◽  
3D Space ◽  
Prior Constraint ◽  
Rotationally Symmetric ◽  
Physics Simulation ◽  
Interaction Interface

In current CAD software the process of assembly modeling is hindered by a large number of separate rotation and translation actions necessary, especially in case of larger assemblies. Additionally matching faces, edges or points must be selected by clicking to define the appropriate constraint. In contrast to that, the process of assembling two normal sized physical parts in the real world seems to be rather simple. That is because we know how to grasp and move objects with our hands intuitively from our everyday experience. The idea behind this contribution is to enable the product developer to assemble CAD parts in a virtual environment through natural finger interaction like in reality. Therefore we present an overall method that combines the natural finger interaction with virtual objects and the insertion of constraints between rotationally symmetric CAD parts. The developed algorithms identify matching surfaces on the basis of the geometry as well as position and orientation of the parts in 3D space. This paper highlights the method to use a combination of real-time physics simulation and a heuristic approach to achieve an intuitive interaction interface. Additionally, we describe the detection algorithms developed to find assembly relationships between rotationally symmetric CAD parts without prior constraint definition. We also present a prototype system to demonstrate the functionality of the overall method. Furthermore, challenges for future research, such as extending the functionality of the detection algorithms on additional part types, like non-rotationally symmetric shapes, are discussed.

scholarly journals Comparative evaluation of WIMP and immersive natural finger interaction: a user study on CAD assembly modeling

2021 ◽  
Author(s):  
Marius Fechter ◽  
Benjamin Schleich ◽  
Sandro Wartzack
Keyword(s):  
User Interfaces ◽  
User Study ◽  
Spatial Location ◽  
Ease Of Use ◽  
Natural Interaction ◽  
Assembly Modeling ◽  
3D Space ◽  
Computer Mouse ◽  
Study Results ◽  
Assembly Procedure

AbstractVirtual and augmented reality allows the utilization of natural user interfaces, such as realistic finger interaction, even for purposes that were previously dominated by the WIMP paradigm. This new form of interaction is particularly suitable for applications involving manipulation tasks in 3D space, such as CAD assembly modeling. The objective of this paper is to evaluate the suitability of natural interaction for CAD assembly modeling in virtual reality. An advantage of the natural interaction compared to the conventional operation by computer mouse would indicate development potential for user interfaces of current CAD applications. Our approach bases on two main elements. Firstly, a novel natural user interface for realistic finger interaction enables the user to interact with virtual objects similar to physical ones. Secondly, an algorithm automatically detects constraints between CAD components based solely on their geometry and spatial location. In order to prove the usability of the natural CAD assembly modeling approach in comparison with the assembly procedure in current WIMP operated CAD software, we present a comparative user study. Results show that the VR method including natural finger interaction significantly outperforms the desktop-based CAD application in terms of efficiency and ease of use.

scholarly journals OOPS, Turning MIT Opencourseware into Chinese: An analysis of a community of practice of global translators

2007 ◽  
Vol 8 (3) ◽  
Author(s):  
Mimi Miyoung Lee ◽  
Meng-Fen Grace Lin ◽  
Curtis J. Bonk
Keyword(s):  
Collective Identity ◽  
Global Education ◽  
Online Community ◽  
Open Educational Resources ◽  
Future Research ◽  
Prototype System ◽  
Democratic Leadership ◽  
Emergence Success ◽  
Joint Enterprise ◽  
High Level

An all-volunteer organization called the Opensource Opencourseware Prototype System (OOPS), headquartered in Taiwan, was initially designed to translate open source materials from MIT OpenCourseWare (OCW) site into Chinese. Given the recent plethora of open educational resources (OER), such as the OCW, the growing use of such resources by the world community, and the emergence of online global education communities to localize resources such as the OOPS, a key goal of this research was to understand how the OOPS members negotiate meanings and form a collective identity in this cross-continent online community. To help with our explorations and analyses within the OOPS translation community, several core principles from Etienne Wenger’s concept of Communities of Practice (COP) guided our analyses, including mutual engagement, joint enterprise, shared repertoire, reification, and overall identity of the community. In this paper, we detail how each of these key components was uniquely manifested within the OOPS. Three issues appeared central to the emergence, success, and challenges of the community such as OOPS: 1) strong, stable, and fairly democratic leadership; 2) participation incentives; and 3) online storytelling or opportunities to share one’s translation successes, struggles, and advice within an asynchronous discussion forum. While an extremely high level of enthusiasm among the OOPS members underpinned the success of the OOPS, discussion continues on issues related to quality control, purpose and scope, and forms of legitimate participation. This study, therefore, provides an initial window into the emergence and functioning of an online global education COP in the OER movement. Future research directions related to online global educational communities are discussed.

Music Onset Detection

2010 ◽  
pp. 297-316
Author(s):  
Ruohua Zhou ◽  
Josh D Reiss
Keyword(s):  
Performance Measures ◽  
Essential Role ◽  
General Scheme ◽  
Future Research ◽  
Onset Detection ◽  
Time Frequency ◽  
Detection Algorithms ◽  
Music Signal ◽  
Wide Range ◽  
Future Research Directions

Music onset detection plays an essential role in music signal processing and has a wide range of applications. This chapter provides a step by step introduction to the design of music onset detection algorithms. The general scheme and commonly-used time-frequency analysis for onset detection are introduced. Many methods are reviewed, and some typical energy-based, phase-based, pitch-based and supervised learning methods are described in detail. The commonly used performance measures, onset annotation software, public database and evaluation methods are introduced. The performance difference between energy-based and pitch-based method is discussed. The future research directions for music onset detection are also described.

scholarly journals Vehicular Delay-Tolerant Networks with Image Recognition-Based Adaptive Array Antenna for Winter Road Surveillance in Local Areas

2019 ◽  
Vol 11 (9) ◽  
pp. 203
Author(s):  
Uchida ◽  
Sato ◽  
Shibata
Keyword(s):  
Image Recognition ◽  
Surveillance System ◽  
Delay Tolerant Networks ◽  
Array Antenna ◽  
Future Research ◽  
Adaptive Array ◽  
Prototype System ◽  
Intelligent Transport System ◽  
Winter Road ◽  
Delay Tolerant

The rapid growth of the ITS (intelligent transport system) development requires us to realize new kinds of applications, such as the winter road surveillance system. However, it is still necessary to consider the network difficulty areas for LTE (long-term evolution) or 3G transmissions when one visits sightseeing spots such as ski resorts or spas in mountain areas. Therefore, this paper proposes a winter road surveillance system in the local area based on vehicular delay-tolerant networks. The adaptive array antenna controlled by image recognition with the Kalman filter algorithm is proposed as well to the system in order to realize higher delivery rates. The implementations of the prototype system are presented in this paper as well, and the effectivity of the radio transmission in the prototype system is realized by vehicular image recognition methods and the asynchronous voltage controls for antenna elements for the rapid directional controls of the radio transmission. The experimental results showed that the radio directional controls by the prototype system for the target vehicle can proceed within one second, and that the simulation with the GIS (geographic information system) map pointed out the delivery rates of the proposed method—which are better than those of the epidemic DTN (delay-tolerant networking) routing by the nondirectional antenna. The experiments of the proposed methods indicate a higher efficiency of the data transmissions—even in the mountain area. Furthermore, future research subjects are discussed in this paper.

E-Learning Localized

2011 ◽  
pp. 168-186
Author(s):  
Meng-Fen (Grace) Lin ◽  
Mimi Miyoung Lee
Keyword(s):  
Early Stage ◽  
Future Research ◽  
Prototype System ◽  
Educational Materials ◽  
Stage Of Development ◽  
The World ◽  
History Of ◽  
E Learning ◽  
English Speaking ◽  
China Region

The power of Internet provides unprecedented opportunities for learners to obtain diverse content and for educators to quickly distribute resources. In the increasing globalized learning environment, OpenCourseWare (OCW) is one of the recent movements to utilize the Internet in making educational materials freely available to the world. However, the fact that these materials are offered mainly in English poses challenges to the non-English speaking population in many parts of the world. In response to such concern in the Great China Region, a localization project called the Opensource OpenCourseWare Prototype System (OOPS) was born in Taiwan in February, 2004 (Lin & Chu, 2005). OOPS aims to break the language barrier and deliver the openly-accessible English educational materials to the Chinese-speaking audience in their native language. This chapter presents the detailed background and history of this project, and highlights three challenges that OOPS has faced in its early stage of development. They are: (1) access to materials, (2) issues about translation, and (3) complexity of intra-cultural communication. Based on the first author’s direct experience with the project, suggestions and implications for future research are also offered.

An Integrated Framework of Knowledge Management

2003 ◽  
Vol 02 (03) ◽  
pp. 245-252 ◽  
Author(s):  
Meliha Handzic
Keyword(s):  
Knowledge Management ◽  
Common Ground ◽  
Future Research ◽  
Holistic View ◽  
Integrated Framework ◽  
Know How ◽  
The Core ◽  
Knowledge Processes ◽  
Units Of Analysis ◽  
Organisational Factors

One of the most interesting aspects of knowledge management (KM) is the striking diversity of the field. A wide variety of frameworks of KM have recently appeared in the literature reflecting different emphases and meanings of the term to different people. While all different views are acknowledged, there is a need to integrate and reconcile the demands of each view. An integrated framework proposed here brings together different perspectives on knowledge management and provides a unifying view based on descriptive and inductive inquiry. The core of the framework is a two-by-two matrix with 'explicit' and 'tacit' 'know-that' and 'know-how' dimensions of working knowledge. Working knowledge is affected by processes that generate, transfer and apply knowledge. Technological and organisational factors act as enablers that influence knowledge processes. By providing a holistic view, common ground, consistent terminology and units of analysis, it is hoped that the proposed framework may be useful in enhancing understanding and in providing guidance for the future research and practice of knowledge management.

Factors Affecting Consumer Participation In Online Shopping In Malaysia: The Case Of University Students

2012 ◽  
Vol 5 ◽  
Author(s):  
Mohammed Shamsul Chowdhury ◽  
Nadiah Ahmad
Keyword(s):  
Online Shopping ◽  
Pearson Correlation ◽  
Consumer Participation ◽  
Future Research ◽  
The Internet ◽  
Factors Affecting ◽  
Know How ◽  
Shopping Behaviour ◽  
Key Factor

Since lack of trust has remained one of the barriers to online shopping, this study is intended to explore the factors that affect the perceptions of trust for students’ intent to participate in online shopping. We used non-probability procedure to select respondents since we do not know how many students have access to the internet and are engaged in online shopping. Pearson correlation, multiple regression were used to test the hypotheses. The regression analysis in this study clearly supported trust and integrity, which had significance influence towards consumer participation. The study also found the trust variable had the highest correlation with the dependent variable followed by integrity.The study provided a useful insight on the significant role of trust in students’ online shopping. The study implies that trust is a key factor that indicates the effect of the Internet vendor trust on students’ online shopping behaviour. Recommendations for future research are suggested. 

A Method of Dispatching Automation Master System Software Testing Based on Cloud Computing Technology

2014 ◽  
Vol 1070-1072 ◽  
pp. 759-764
Author(s):  
Yu Jia Li ◽  
Qing Bo Yang ◽  
Jing Hua ◽  
Fang Chun Di ◽  
Li Xin Li
Keyword(s):  
Cloud Computing ◽  
Software Testing ◽  
Research Direction ◽  
Test Methods ◽  
Future Research ◽  
System Software ◽  
Testing Environment ◽  
Master System ◽  
Interaction Interface ◽  
Testing Management

Problems such as high cost of building a testing environment, low degree of automation and low rates of resource utilization are commonly met during the dispatching automation master system software testing. Cloud Computing technologies were introduced to solve these problems. Test methods based on the virtualization and other key technologies were studied and a testing platform includes user management module, testing resource management module, testing management module and man-machine interaction interface module was built. A method composed of three testing modes was presented which can be applied usefully in the static and dynamical testing of dispatching automation master system. Future research direction is prospected in the end of the paper.

scholarly journals Hole Detection for Quantifying Connectivity in Wireless Sensor Networks: A Survey

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Pearl Antil ◽  
Amita Malik
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Wireless Sensor ◽  
Future Research ◽  
Detection Algorithms ◽  
Coverage Hole ◽  
Future Research Directions ◽  
Detection Schemes ◽  
Coverage Hole Detection ◽  
Hole Detection

Owing to random deployment, environmental factors, dynamic topology, and external attacks, emergence of holes in wireless sensor networks is inescapable. Hole is an area in sensor network around which sensors cease to sense or communicate due to drainage of battery or any fault, either temporary or permanent. Holes impair sensing and communication functions of network; thus their identification is a major concern. This paper discusses different types of holes and significance of hole detection in wireless sensor networks. Coverage hole detection schemes have been classified into three categories based on the type of information used by algorithms, computation model, and network dynamics for better understanding. Then, relative strengths and shortcomings of some of the existing coverage hole detection algorithms are discussed. The paper is concluded by highlighting various future research directions.

The work of conservation organisations in sub-Saharan Africa

2010 ◽  
Vol 48 (1) ◽  
pp. 1-33 ◽  
Author(s):  
Dan Brockington ◽  
Katherine Scholfield
Keyword(s):  
The State ◽  
Sub Saharan Africa ◽  
Future Research ◽  
General Knowledge ◽  
Know How ◽  
Sub Saharan ◽  
Development Ngos

ABSTRACTConservation non-governmental organisations (NGOs) have excited a great deal of comment and debate, generally quite divided, in diverse journals. Some advocate them as forces for good, others decry their clumsy dealings with rural peoples and the impoverishment their activities can cause. The debate suffers in two ways. First, it ignores a large parallel literature about the work of development NGOs. Second, there is a paucity of general knowledge about the state of the conservation NGO sector. We do not know where it works, what the main players are doing, or much at all about the extent or activities of the smaller conservation organisations. We do not know how much money the sector spends. In this paper we first briefly outline why work on development NGOs should be applied to conservation NGOs, and then offer an overview of the sector's activities based on a survey of over 280 organisations. We describe some of the basic contours of these activities, and reflect on the implications of our findings for existing writings about conservation NGOs and future research.

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