423 research outputs found
Anti - theft vehicle security system with preventive action
Nowadays rate of vehicle theft is very high all through the world and the situation are even worse in developing country. Therefore, protection of vehicles with an intelligent, reliable, effective and economical system is very important. The existing technologies for vehicle security have a number of limitations including high false alarm rate, easy deactivation and high cost. In this research an Anti-Theft Vehicle Security System (ATV2S) has been design and implemented utilizing sensor-network system which employ Global Positioning System (GPS) and Global System for mobile communication (GSM) technology to track the vehicle. The cutting edge technology of ATV2S is capable to protect, monitor and track the vehicle even within a minute
Development of a semi automated dual feed unit to produce FGM coatings using the HVOF thermal spray process
The application of functionally graded materials (FGMs) is quite difficult, but thermal spray processes like Plasma spray have demonstrated their unique potential in producing graded deposits, where researchers have used twin powder feed systems to mix different proportions of powders. FGMs vary in composition and/or microstructure
from one boundary (substrate) to another (top service surface), and innovative characteristics result from the
gradient from metals to ceramics or non-metallic to metals. The present study investigates an innovative
modification of a high velocity oxy-fuel (HVOF) thermal spray process to produce functionally graded thick
coatings. In order to deposit thick coatings, certain problems have to be overcome. Graded coatings enable
gradual variation of the coating composition and/or microstructure, which offers the possibility of reducing
residual stress build-up with in coatings. In order to spray such a coating, modification to a commercial
powder feed hopper was required to enable it to deposit two powders simultaneously which allows deposition of
different layers of coating with changing chemical compositions, without interruption to the spraying process. Various concepts for this modification were identified and one design was selected, having been validated through use of a process model, developed using ANSYS Flotran finite element analysis. In the current research the mixing of different proportions of powders were controlled by a computer using LabVIEW software and
hardware, which allowed the control and repeat-ability of the micro structure when producing functionally graded
coatings
Design and development of a powder mixing device used in the deposition of high velocity oxy-fuel (HVOF) thermal spray functionally graded coatings; Kabir Al Mamun
The application of Functionally Graded Materials (FGMs) is quite difficult, but thermal spray processes like Plasma spray have demonstrated their unique potential in producing graded deposits, where researchers have used twin powder feed systems to mix different proportions of powders. However the HVOF (High Velocity Oxy-Fuel) process does not possess this feature. FGMs vary in composition and/or microstructure from one boundary (substrate) to another (top service surface), and innovative characteristics result from the gradient from metals to ceramics or non-metallic to metals. The present study investigates an innovative modification of a HVOF thermal spray process to produce f~~nctionallgyr aded thick coatings. In order to deposit thick coatings, certain problems have to be overcome. Graded coatings enable gradual variation of the coating composition and/or microstructure, which offers the possibility of reducing residual stress bui Id-up with in coatings.
In order to spray such a coating, modification to a commercial powder feed hopper was required to enable it to deposit two powders simultaneously which allows deposition of different layers of coating with changing chemical compositions, without interruption to the spraying process. Various concepts for this modification were identified and one design was selected, having been validated through use of a process model, developed using ANSYS Flotran Finite Element Analysis. Post nod el ling the design was manuFactured and tested experimentally for functionality. In the current research the mixing of different proportions of powders was controlled by a computer using Lab VlEW software and hardware, which allowed the control and repeatability of the microstructure when producing functionally graded coatings
Hierarchical Design Based Intrusion Detection System For Wireless Ad hoc Network
In recent years, wireless ad hoc sensor network becomes popular both in civil
and military jobs. However, security is one of the significant challenges for
sensor network because of their deployment in open and unprotected environment.
As cryptographic mechanism is not enough to protect sensor network from
external attacks, intrusion detection system needs to be introduced. Though
intrusion prevention mechanism is one of the major and efficient methods
against attacks, but there might be some attacks for which prevention method is
not known. Besides preventing the system from some known attacks, intrusion
detection system gather necessary information related to attack technique and
help in the development of intrusion prevention system. In addition to
reviewing the present attacks available in wireless sensor network this paper
examines the current efforts to intrusion detection system against wireless
sensor network. In this paper we propose a hierarchical architectural design
based intrusion detection system that fits the current demands and restrictions
of wireless ad hoc sensor network. In this proposed intrusion detection system
architecture we followed clustering mechanism to build a four level
hierarchical network which enhances network scalability to large geographical
area and use both anomaly and misuse detection techniques for intrusion
detection. We introduce policy based detection mechanism as well as intrusion
response together with GSM cell concept for intrusion detection architecture.Comment: 16 pages, International Journal of Network Security & Its
Applications (IJNSA), Vol.2, No.3, July 2010. arXiv admin note: text overlap
with arXiv:1111.1933 by other author
Reliability evaluation of power network: A case study of Fiji Islands
The reliability of electrical power network is the driving force for the development of a country Nowadays most electrical power industries and companies are working for the better satisfaction of the customers while considering the associate cost. Utility companies must have precise information concerning system performance to achieve these goals, consequently guarantee the assets maintenance. The reliability standard of electric power delivered to the customer in Fiji is still in developing stage. Hence it is obvious to have a thorough understanding on the present situation of Fiji islands. In this paper, the performance of electricity delivered being evaluated using commonly used reliability indexes. So that modification and improvement can be done to enhance reliability of Fiji Islands' power network
Dyeing Chemicals
Dyeing auxiliaries play an important role in the determination of the final dyeing quality. The formation of additional complexes with dyes and auxiliary agents enhances the exhaustion of dyes on textile substrates. For aqueous-based dyeing, dye auxiliaries such as chelating agents, dispersing agents, leveling agents, electrolyte, pH control agents, and surfactants form complexes with the dye on natural and synthetic fibers. A growing awareness of the impact of industrial pollution on the environment became crucial for the dyeing industry in the closing decades of the twentieth century. These chapters discuss the characteristics of dyeing chemicals and how auxiliary substances can assist in achieving outstanding dyeing performance
Enhancing Learnersā Engagement with Educational Apps
Technology-enabled learning environment provides increased opportunities for enhancing learnersā engagement, interaction and collaboration. With the advent of technology, educational applications (apps) have become popular in learning, teaching, and research at all levels of education. Learning through the use of apps is therefore gaining momentum as it affords flexible learning opportunities, coupled with 21st century learning paradigm. The nature of educational apps is varied, be it an app downloadable on a mobile device or customized apps, designed to provide bite sized information or a learning activity based on learning design. The core function of these apps remain the same, which is to provide learners an engaging and meaningful interaction with content and interface such that it enhances not only the learning experience but also success in learning. In short, apps are designed to enhance learning efficiency and effectiveness. The use of apps, from early childhood education through to higher education, provides continuous opportunities to enhance learnersā engagement with learning materials (Diliberto-Macaluso, & Hughes, 2016; Hirsh-Pasek, Zosh, Golinkoff, Gray, Robb, & Kaufman, 2015; Pechenkina, Laurence, Oates, Eldridge, & Hunter, 2017), however there is a need for more research in this area (Hirsh-Pasek et al, 2015; Pechenkina et al, 2017). Hamari, Koivisto, and Sarsa (2014) reported that integration of gamified elements into apps has the potential to engage students and motivate them in a way that it can in turn affect other factors, which influence the learning process
Application of cepstrum analysis and linear predictive coding for motor imaginary task classification
In this paper, classification of electroencephalography (EEG) signals of motor imaginary tasks is studied using cepstrum analysis and linear predictive coding (LPC). The Brain-Computer Interface (BCI) competition III dataset IVa containing motor imaginary tasks for right hand and foot of five subjects are used. The data was preprocessed by applying whitening and then filtering the signal followed by feature extraction. A random forest classifier is then trained using the cepstrum and LPC features to classify the motor imaginary tasks. The resulting classification accuracy is found to be over 90%. This research shows that concatenating appropriate different types of features such as cepstrum and LPC features hold some promise for the classification of motor imaginary tasks, which can be helpful in the BCI context
A Comparative Study on Dyeing Properties of Hemp and Cotton Fiber
In this study, a mixed bi-functional reactive dye was applied to the cotton and hemp woven fabrics. Their dyeing and fastness properties were compared. From the results, it was observed that the cotton fabric exhibits better exhaustion and levelness than hemp woven fabrics. The build-up and fastness properties of the two woven fabrics appeared to be almost similar
Development of situation recognition, environment monitoring and patient condition monitoring service modules for hospital robots
An aging society and economic pressure have caused an increase in the patient-to-staff ratio leading to a reduction in healthcare quality. In order to combat the deficiencies in the delivery of patient healthcare, the European Commission in the FP6 scheme approved the financing of a research project for the development of an Intelligent Robot Swarm for Attendance, Recognition, Cleaning and Delivery (iWARD). Each iWARD robot contained a mobile, self-navigating platform and several modules attached to it to perform their specific tasks.
As part of the iWARD project, the research described in this thesis is interested to develop hospital robot modules which are able to perform the tasks of surveillance and patient monitoring in a hospital environment for four scenarios: Intruder detection, Patient behavioural analysis, Patient physical condition monitoring, and Environment monitoring. Since the Intruder detection and Patient behavioural analysis scenarios require the same equipment, they can be combined into one common physical module called Situation recognition module. The other two scenarios are to be served by their separate modules: Environment monitoring module and Patient condition monitoring module.
The situation recognition module uses non-intrusive machine vision-based concepts. The system includes an RGB video camera and a 3D laser sensor, which monitor the environment in order to detect an intruder, or a patient lying on the floor. The system deals with various image-processing and sensor fusion techniques.
The environment monitoring module monitors several parameters of the hospital environment: temperature, humidity and smoke.
The patient condition monitoring system remotely measures the following body conditions: body temperature, heart rate, respiratory rate, and others, using sensors attached to the patientās body.
The system algorithm and module software is implemented in C/C++ and uses the OpenCV image analysis and processing library and is successfully tested on Linux (Ubuntu) Platform. The outcome of this research has significant contribution to the robotics application area in the hospital environment
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