Isarakorn, Don
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Preferred name
Isarakorn, Don
Alternative Name
Isarakorn, D.
Main Affiliation
Email
don.is@kmitl.ac.th
26 results
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Item type:Publication, Automatic exudate extraction for early detection of Diabetic Retinopathy(2013-01-01); ; Diabetic Retinopathy (DR) is the most common cause of blindness in diabetic patients, but early detection and timely treatment can prevent this problem. Exudates have been found to be one of the signs and serious DR anomalies so the proper detection of these lesions and the treatment should be done immediately to prevent loss of vision. The aim of this study is to automatically detect these lesions in fundus images. To achieve this goal, the proposed method first preprocesses to improve the quality of fundus image, and then Optic Disc (OD) is detected and eliminated to prevent the interference to the result of exudate detection by combination of 3 methods; image binarization, Region Of Interest (ROI) based segmentation and Morphological Reconstruction (MR). Next, exudates are detected by applying the maximum entropy thresholding to filter out the bright pixels from the result of OD region eliminated. Since the result contains some noises which appear as bright light at the edge of fundus area in some images, that affect is considered and eliminated to improve the result of false positive. Finally, exudates are extracted by using MR. The proposed technique has been tested on 100 fundus images from hospital. Experimental results show that 91 % of exudate is extracted correctly with the average process of 3.92 second per image. © 2013 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparative study of QCM analyzers based on pierce oscillator and electromechanical impedance techniques(2017-02-21); ; This paper presents a comparison between pierce oscillator and impedance analysis techniques for measuring the frequency of the quartz crystal. The QCM analyzer based on pierce oscillator is designed, realized, and then compared to the impedance analyzer (Type bode 100). The comparison is focused on accuracy and precision of measurement. The pierce oscillator in a completed-chip is employed in the QCM analyzing device in order to simplify the circuit of system. The frequency drift and standard deviation (SD) values which are obtained from resonant frequency measurement are studied in order to investigate the accurate and precise measurement of devices. In the experiment, an AT-cut quartz disc of crystal oscillator package HC49U is unloaded and loaded while it is being measured the frequency. From the experimental results, the QCM analyzer based on pierce oscillator and impedance analyzer have the approximate accuracy and precision of measurement. The QCM analyzer based on pierce oscillator has lower sensitivity due to the frequency drift. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Polymer based microneedle patch fabricated using microinjection moulding(2018-08-14) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance and Behavior Analysis of Single-Electrode Triboelectric Nanogenerator for Energy Harvesting Floor Tiles(2020-06-01); A triboelectric nanogenerator (TENG) is a promising candidate for harvesting the wasted energy from the ambient environment and utilizing it as an independent power source for batteries used in wearable and portable devices as well as sensing systems. This paper investigated the performance and behavior of triboelectric energy harvesters based on energy harvesting floor tiles by applying different mechanical input parameters such as contact gap, velocity, and vibration frequency to characterize the electrical characteristics while maintaining the applied pressure of 600 kPa and temperature. The results revealed that massive air gap displacement tends to generate higher electrical output. This demonstrated that the device could generate 2294.14 μW of optimal power and 95.50 μJ of total energy in 10 s at the mechanical excited frequency of 2 Hz with a fixed gap displacement of 5 mm. Moreover, the output power is proportional to the velocity of the cover plate movement. In contrast, varying the relative humidity (%RH) showed that the TENG could generate high electrical output at low relative humidity. The proposed work demonstrates that the TENG can function as an energy-harvesting device from low-frequency mechanical vibration for energy harvesting floor tiles. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A Comparative Study of the Electrical Characteristics of Piezoelectric and Triboelectric Nanogenerators for Energy-Harvesting Floor Tiles(2020-06-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparative study of piezoelectric energy harvesters based on polycrystalline PZT and single-crystalline PMN-PT materials(2016-09-06) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Indoor positioning system on identification of neurodegenerative disease: A comparative study of BLE versus RFID(2019-07-01); This paper introduces the feasibility examination of indoor positioning system using the Bluetooth low energy (BLE) and the radio-frequency identification (RFID) devices to further apply in the diagnosis of neurodegenerative disease leading an unusual human body motion. Experimentally, a BLE module and a RFID tag are simulated to be the wearable devices mounted to human body, moving with common body motions. Their movements affecting on position tracking efficiency are investigated through smartphone and ultra-high frequency RFID reader, respectively. The results show that a BLE device presents the best position sensing ability. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Piezoelectric energy harvesting from machine vibrations for wireless sensor system(2015-08-17); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, DC motor control using CDM based two-degree-of-freedom controller for desired tracking and disturbance rejection characteristics(2012-12-01)This paper focuses on a design of two-degree-of-freedom (2DOF) controller by Coefficient Diagram Method (CDM) for position control of a DC motor. It is known that the 2DOF control system can be designed to meet both tracking and disturbance rejection performances, which are the most important for the position control system. Nevertheless, it requires tuning of many parameters. The CDM is an efficient method in designing the parameters of 2DOF controller based on the stability and the speed of the controlled system so that the desired performance criteria can be met. By the proposed design method, the parameters of 2DOF controller for a DC motor control system are obtained properly without any adjustment. Furthermore, the tracking and disturbance rejection performances are simultaneously designed. The results reveal the versatility of the CDM tuning technique in the position control of a DC motor. © 2012 ICROS. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Primary screening of diabetic retinopathy based on integrating morphological operation and support vector machine(2017-07-02); ;