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Fall Detection System for the Elderly Based on the Classification of Shimmer Sensor Prototype Data
Moiz Ahmed,Nadeem Mehmood,Adnan Nadeem,Amir Mehmood,Kashif Rizwan 대한의료정보학회 2017 Healthcare Informatics Research Vol.23 No.3
Objectives: Falling in the elderly is considered a major cause of death. In recent years, ambient and wireless sensor platforms have been extensively used in developed countries for the detection of falls in the elderly. However, we believe extra efforts are required to address this issue in developing countries, such as Pakistan, where most deaths due to falls are not even reported. Considering this, in this paper, we propose a fall detection system prototype that s based on the classification on real time shimmer sensor data. Methods: We first developed a data set, ‘SMotion’ of certain postures that could lead to falls in the elderly by using a body area network of Shimmer sensors and categorized the items in this data set into age and weight groups. We developed a feature selection and classification system using three classifiers, namely, support vector machine (SVM), Knearest neighbor (KNN), and neural network (NN). Finally, a prototype was fabricated to generate alerts to caregivers, health experts, or emergency services in case of fall. Results: To evaluate the proposed system, SVM, KNN, and NN were used. The results of this study identified KNN as the most accurate classifier with maximum accuracy of 96% for age groups and 93% for weight groups. Conclusions: In this paper, a classification-based fall detection system is proposed. For this purpose, the SMotion data set was developed and categorized into two groups (age and weight groups). The proposed fall detection system for the elderly is implemented through a body area sensor network using third-generation sensors. The evaluation results demonstrate the reasonable performance of the proposed fall detection prototype system in the tested scenarios.
A stamped PEDOT:PSS–silicon nanowire hybrid solar cell
Moiz, Syed Abdul,Nahhas, Ahmed Muhammad,Um, Han-Don,Jee, Sang-Won,Cho, Hyung Koun,Kim, Sang-Woo,Lee, Jung-Ho IOP Pub 2012 Nanotechnology Vol.23 No.14
<P>A novel stamped hybrid solar cell was proposed using the stamping transfer technique by stamping an active PEDOT:PSS thin layer onto the top of silicon nanowires (SiNWs). Compared to a bulk-type counterpart that fully embeds SiNWs inside PEDOT:PSS, an increase in the photovoltaic efficiency was observed by a factor of ∼4.6, along with improvements in both electrical and optical responses for the stamped hybrid cell. Such improvements for hybrid cells was due to the formation of well-connected and linearly aligned active PEDOT:PSS channels at the top ends of the nanowires after the stamping process. These stamped channels facilitated not only to improve the charge transport, light absorption, but also to decrease the free carriers as well as exciton recombination losses for stamped hybrid solar cells.</P>
Functional Dyeing of Cellulose-based (Linen) Fabric Using Bombax Ceiba (Kapok) Flower Extract
Arsheen Moiz,Rajiv Padhye,Xin Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
Linen fiber, which is claimed to be more comfortable than cotton, is an important textile fiber obtained from Linum usitatissimum (Flax) plant. However, the lack of functional properties of linen limits its application in functional textile products. Nowadays, use of natural colorant for textile dyeing has become an attractive option for sustainable textilecoloration. Kapok flower is an unexplored source of natural dyestuff which can also be utilized for functionalization of cellulose-based textiles. In the current work, kapok flower extract (KFC) was utilized as a functional dye for dyeing of linen fabric in the presence of metallic mordants. The dyed fabrics were evaluated for coloration properties (color values, color coordinates, and fastness properties) as well as functional properties viz. antibacterial activity, UV protection, and antioxidant activity. The satisfactory level of dyeing with acceptable fastness ratings was achieved on linen fabrics. The dyed fabrics displayed an excellent antibacterial activity against gram-positive and gram-negative bacteria. The efficient level of UV protection and radical scavenging (antioxidant activity) was also obtained. The mechanism of functional modification of linen using KFC was discussed.
Tariq Moiz,Khan Azam,Khan Hammad Anis,Hussain Iqra 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.4
This study introduces a new MATLAB subroutine designed to simplify a rigid-plastic model for analysing the dynamic response of steal beam under blast loading. The numerical framework integrates a Linear Complementarity (LC) model to evaluate the impact of loading on skeletal structures. The study aims to enhance the computational, algorithmic and numerical stability of this robust procedure while assessing the response of steel beams subjected to blast loading conditions. The computational results are then validated using experimental and computational examples. The fi rst example seeks a theoretical solution for a steel beam exposed to a uniformly distributed triangular pulse load of varying magnitudes, presenting and contrasting both numerical and theoretical outcomes. In the second example, far-fi eld blast experimental and computational results are compared with predictions from the LCP model. The fi ndings illustrate a strong alignment between the model and experimental data documented in existing literature.
Arsheen Moiz,Rajiv Padhye,Xin Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
Tailoring the surface of fibrous materials has brought special performance to textiles, endowing protection against threats from either environment or in wearer’s daily routine. Different functionalization techniques, including plasma treatment, pad-knife-pad coating and laminating, have been widely used to engineer the surface of fabrics for this purpose. This study contributes a comprehensive comparison of fabrics treated by these different techniques, in terms of surface morphology, chemical components, handle, superhydrophobicity and its durability, and resistance against water, liquid, oil, chemicals and soil. The comfort of the fabrics, including air permeability and moisture management properties, was also analyzed. It has been found that these functionalization techniques brought different levels of versatile protection to textiles with the sacrifice of comfort due to the change of the surface of fabrics.
A Heuristic approach for Effective Management of Concurrent Transactions in Mobile Environments
Salman Abdul Moiz 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.1
The inherent limitations of mobile environments like disconnections, mobility, bandwidth etc affects the performance of system when several mobile clients access the shared data items at the same time. Several timeout based strategies are implemented in literature to deal with the starvation of data items during disconnections and mobility. This increases the abort and rollback rates. In the proposed heuristic approach, the time for execution of a transaction can be predicted based on the given timer value for a specific mobile client. The simulation results show the time for execution can be dynamically estimated given the timer value and vice versa for a particular request originating from specific mobile clients. This increases the throughput of the system as compared to the timer based strategies proposed in the literature.
Syed Abdul Moiz,Mansoor M. Ahmed,Kh. S. Karimov 한국전자통신연구원 2005 ETRI Journal Vol.27 No.3
In this paper the effect of temperature on the electrical properties of organic semiconductor disperse orange dye 25 (OD) have been examined. Thin films of OD have been deposited on In2O3 substrates using a centrifugal machine. DC current-voltage (I-V) characteristics of the fabricated devices (Al/OD/In2O3) have been evaluated at varying temperatures ranging from 40 to 60°C. A rectification behavior in these devices has been observed such that the rectifying ratio increases as a function of temperature. I-V characteristics observed in Al/OD/In2O3 devices have been classified as low temperature (≤ 50°C) and high temperature characteristics (approximately 60°C). Low temperature characteristics have been explained on the basis of the charge transport mechanism associated with free carriers available in OD, whereas high temperature characteristics have been explained on the basis of the trapped space-charge-limited current. Different electrical parameters such as traps factor, free carrier density, trapped carrier density, trap density of states, and effective mobility have been determined from the observed temperature dependent I-V characteristics. It has been shown that the traps factor, effective mobility, and free carrier density increase with increasing values of temperature, whilst no significant change has been observed in the trap density of states.