khairul azman Ahmad

khairul azman Ahmad
Universiti Teknologi MARA | UiTM · Faculty of Electrical Engineering

B. Eng. (Hons) Electrical, M. Eng. Electrical

About

57
Publications
7,380
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228
Citations
Citations since 2016
40 Research Items
179 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040

Publications

Publications (57)
Conference Paper
Breast cancer imaging currently improved for the past two decades due to digitalization and computer development. Studies have shown that early cancer diagnosis can improve the life expectancy of patients. The most effective and popular technique for detecting the early modalities or other abnormalities in human breast tissue is digital mammography...
Article
Piezoelectric energy harvesting is the process of extracting electrical energy using energy harvester devices. Any stress in the piezoelectric material will generate induced voltage. Previous energy harvester device with stiff cantilever beam was generated low harvested energy. A flexural piezoelectric energy harvester is proposed to improve the ge...
Article
Full-text available
Introduction. Known vibrational energy harvesting methods use a source of vibration to harvest electric energy. Piezoelectric material works as a sensing element converted mechanical energy (vibration) to electrical energy (electric field). The existing piezoelectric energy harvesting (PEHs) devices have low sensitivity, low energy conversion, and...
Article
Full-text available
In acoustic receiver design, the receiving sensitivity and bandwidth are two primary parameters that determine the performance of a device. The trade-off between sensitivity and bandwidth makes the design very challenging, meaning it needs to be fine-tuned to suit specific applications. The ability to design a PMUT with high receiving sensitivity a...
Article
Detection of crack on asphalt pavement is an essential task of monitoring and regulatory inspection. Currently, this task is conducted manually by surveyor or human inspectors for further maintenance works. Manual practice would lead some drawback such as time-consuming, labour intensive, hazardous and also subjective valuation for different indivi...
Article
Full-text available
Conventional farming is labor-consuming and the need to continuously monitor crops can be a burden for farmers. By realizing the concept of smart farming based on Internet of Things (IoT) technology, farmers can use a mobile application to observe and monitor air humidity, air temperature, and soil moisture – factors that can affect plant growth. F...
Article
Full-text available
Piezoelectric energy harvesters (PEH) can be used in many areas of application, including human walking, railways, pavements and bridges. Piezoelectric energy harvesters are currently based on two types of external forces, namely pressure load and mechanical oscillation or vibration. A vibration energy harvesting (VEH) is a mechanical oscillation i...
Conference Paper
Pavement distress refers to the condition of pavement surface in terms of its general appearance. Cracks is a type of pavement distress and commonly occur in a road infrastructure. Crack on a pavement surface shows an early sign of pavement problems and aging. Thus, it is important to detect a serious crack as soon as possible to avoid any road acc...
Article
Full-text available
Visual cues are undoubtedly important for children who are in the process of learning. Nevertheless, visual impairments are in fact common among school children, in which proper assessment and intervention strategies should be made available. To achieve the desired academic achievement and quality of life, early detection and intervention of visual...
Article
Full-text available
This study presents characterization of cracking in pavement distress using image processing techniques and k-nearest neighbour (kNN) classifier. The proposed semi-automated detection system for characterization on pavement distress anticipated to minimize the human supervision from traditional surveys and reduces cost of maintenance of pavement di...
Article
Full-text available
Piezoelectric Acoustic Transducer (PAT) is a transducers used in many application such as medical diagnostic, medical ultrasonic imaging and underwater acoustic applications. Latest research, PAT were investigated in marine application and underwater acoustic imaging. Conventional PAT is design based on sensing element, Piezoelectric Material, matc...
Conference Paper
Micromachined ultrasonic transducer has been used in many application for example non-destructive test, medical diagnostic and underwater application. One of the underwater application is underwater acoustic imaging system. Underwater acoustic imaging system needs a transducer with wide bandwidth to perform high resolution image. In previous paper,...
Conference Paper
This paper present the particle contamination detection during plasma etching process by using k-nearest neighbor (kNN) and Fuzzy k-nearest neighbor (FkNN). In the process of manufacturing semiconductor devices, detecting particle contamination in process tool is a vital factor for determining for product yield. In situ particle is an accurate and...
Conference Paper
Knee-FES-ergometer for knee swinging exercise is introduced as a hybrid exercise for restoration of function of the knee for stroke patients through the application of functional electrical stimulation (FES). The aim of the new knee-FES-ergometer is to provide high intensity knee swinging exercise. It is able to reduce required electrical stimulati...
Conference Paper
Full-text available
Cervical cancer been known to be the cause of many deaths each year. Screening tests, such as the Pap smear test used for the detection of the precancerous stage are able to avoid the occurrence of cervical cancer. However, the Pap smear test does have some disappointing disadvantages such as the fact that it has less effective slide preparation an...
Conference Paper
This paper concerns miniaturization using Surface Mount Technology (SMT) of potentiometric indicator system for measuring human stress. The piezoresistive MEMS sensor is integrated with potentiometric indicator system that converts a biochemical signal into a measurable signal. The overall project involved transduction stage, filtering, voltage fol...
Conference Paper
Gel electrophoresis (GE) is a process of DNA, RNA and protein molecules separation using electric field applied to a gel matrix. This paper describes the image processing techniques applied on GE image to segment the bands from their background. A few pre-processing steps are applied on the image prior to the segmentation technique for the purpose...
Article
The field of medical imaging gains its importance with increase in the need of automated and efficient diagnosis in a short period of time. One of the primary diagnostic and treatment evaluation tools for brain interpretation has been magnetic resonance imaging (MRI). It has been a widely-used method of high quality medical imaging, especially in b...
Article
The detection of moving object in dynamic case especially outdoor case is very challenging for computer vision. One of the problems in dynamic case is detection of shadow in moving object. This paper presents the improvement of moving vehicle detection using removal shadow technique in RGB color space and frame difference technique. In RGB color sp...
Conference Paper
This paper describes the development of a self adaptive neuro-fuzzy control mechanism for FES-assisted indoor rowing exercise (FES-rowing). The FES-rowing is introduced as a total body exercise for rehabilitation of function of lower body through the application of functional electrical stimulation (FES). The neuro-fuzzy control technique is a cont...
Article
This paper describes the evaluation of the spreading factor inertia weight Particle Swarm Optimization (PSO) for the fuzzy logic control (FLC) of FES-assisted paraplegic indoor rowing exercise (FES-rowing). The FES-rowing is introduced as a total body exercise for rehabilitation of lower extremities through the application of functional electrical...
Article
Gel electrophoresis (GE) is an important tool in genomic analysis. It is a process of DNA, RNA and protein molecules separation using electric field applied to a gel matrix. This paper describes the image processing techniques applied on GE image to segment the bands from their background. Numerous pre-processing steps are applied on the image prio...
Conference Paper
Full-text available
This paper introduce the adaptive kalman filter to modeling dynamic background for background subtraction. Background subtraction is a method to identify object and famous used in moving object segmentation. In this paper we also investigate a comparison study on Gaussian subtraction method, frame differencing method and approximate median method....
Conference Paper
The field of medical imaging gains its importance with increase in the need of automated and efficient diagnosis in a short period of time. One of the primary diagnostic and treatment evaluation tools for brain interpretation has been magnetic resonance imaging (MRI). It has been a widely-used method of high quality medical imaging, especially in b...
Article
Full-text available
This paper compared various MLP activation functions for classification problems. The most well-known (Artificial Neural Network) ANN architecture is the Multilayer Perceptron (MLP) network which is widely used for solving problems related to data classifications. Selection of the activation functions in the MLP network plays an essential role on t...
Article
Full-text available
Protection in power system is very important to ensure the systems are in a good condition without any failure. It is necessary that the protection system can operate at the shortest time to clear the fault as soon as possible. Overcurrent relay protection is depending on their time-current characteristic curve. In this particular characteristic cu...
Article
Full-text available
Monitoring car performance in terms of fuel consumption, velocity and other important parameters is crucial in order to ascertain whether a car is operating optimally. The purpose of this research is to design and develop a new data logger to monitor general car performance. Data has been collected via a wireless device attached to the car, which t...

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