Hashimah Ismail | Faculty of Engineering & Life Sciences (original) (raw)
Papers by Hashimah Ismail | Faculty of Engineering & Life Sciences
2012 IEEE International Conference on Control System, Computing and Engineering, 2012
ABSTRACT This study analyzed the effect of temperature during steam distillation extraction on th... more ABSTRACT This study analyzed the effect of temperature during steam distillation extraction on the essential oil quality. An improvised steam distillation system was applied for Cymbopogon nardus extraction with the capability to regulate the steam temperature at any desired value. The quality was evaluated using refractive index and GC-MS analysis. The results were compared with the international standard for citronella oil (BS ISO 3849:2003) and against the data gathered from literatures. The chemical compounds are much differed from literatures but complied with the minimum requirements from the ISO standard. Nonetheless, quality improvement of the yield can be observed between each sample from different temperature settings.
The European Proceedings of Multidisciplinary Sciences
The higher education system in this world has been challenged by the Covid-19 pandemic since earl... more The higher education system in this world has been challenged by the Covid-19 pandemic since early 2020 and has disturbed the normal operation of education services including UNISEL. Despite the difficulties in the new normal of strict Standard Operating Procedure (SOP) and Movement Control Order (MCO) imposed by the government, UNISEL operations especially in academic services and teaching & learning have continued as usual throughout the MCO. UNISEL has managed to sustain its operation and successfully faced the challenges. This sustainability can be well connected to the UNISEL's implementation of ISO 21001:2018 Educational Organization Management Systems (EOMS). The EOMS standard provides a general ground of education management system that can be used in any condition. The effectiveness of the EOMS implementation can be proven by the students' satisfaction survey. The instruments of this survey were divided into five aspects which are students' demographic, teaching and learning, facilities, support services, student's activities, and overall experience as a student in UNISEL. The questionnaire consists of 31 and the likert scale used was ranked from 1 to 5 for the students' satisfaction survey. The results for each aspect were then compared with previous years' data. The comparison analysis showed that there was no significant satisfaction reduction for the 2021 survey and there was a slight improvement in the teaching and learning aspects as compared to the previous year. The study proved that the EOMS standard is robust and can help education providers to sustain in challenging conditions like pandemic Covid-19.
This study evaluates the performance between reaction curve Ziegler-Nichols tuning rules applied ... more This study evaluates the performance between reaction curve Ziegler-Nichols tuning rules applied to FOPDT model and the open-loop relay feedback tuning method based on ultimate gain and period. Error and control signal switching were equipped to enhance the output response over a limited steam temperature response. The control performance was evaluated experimentally on a steam distillation process regulation. The proposed technique employing relay tuning together with error switching had produced an astounding closed-loop response even for a non-linear steam temperature control.
Optical Materials, 2021
Abstract In this work, we have synthesized (Fe2O3)1-x: (NiO)x thin films by pulsed laser depositi... more Abstract In this work, we have synthesized (Fe2O3)1-x: (NiO)x thin films by pulsed laser deposition, then study the impact of NiO doping concentrations on the linear and nonlinear optical characteristics. The optical properties were investigated by the UV–visible spectrophotometer. The transmittance was influenced by NiO doping concentrations as well as the absorption and extinction coefficients. Moreover, the band gap was found to decrease from 2.69371 to 2.41751 eV with increasing NiO contents in the Fe2O3 matrix. Furthermore, the nonlinear optical parameters were estimated based on the Wemple-DiDomenico model, the single-oscillator energy was increased from 2.29 to 2.86 eV as the dispersion energy was found to increase from 8.04 to 16.72 eV by increasing NiO doping concentrations, the third-order nonlinear susceptibility was found to increase in the doped films from 1.04 × 10–12 to 7.96 × 10–12 esu. The best result was achieved in (Fe2O3)0.98: (NiO)0.02 thin film where the highest nonlinear optical constants were obtained which make it a potential candidate in nonlinear optics (NLO) applications.
ABSTRACT This paper presents comparative studies on control performance using self-tuning Fuzzy-P... more ABSTRACT This paper presents comparative studies on control performance using self-tuning Fuzzy-PID and self-tuning Pole-Placement PID controller with application to saturated steam temperature regulation. The steam is used in the essential oil extraction process where the steam temperature must be regulated to preserve the oil quality. Online tuning using fuzzy rules did not require accurate model and hence easier to implement. On the other hand, self-tuning using pole-placement method requires the plant parameters to be updated recursively so that the controller gain can be adjusted. Result shows that self-tuning Pole-Placement PID controller performs better response.
Fractional-order PID (FOPID) control is currently an emerging topic in control engineering resear... more Fractional-order PID (FOPID) control is currently an emerging topic in control engineering research. The controller was proven to perform better than the integer-order controller because of the generalization in the integrator and differentiator power. But lately, the application has been widened into non-PID type controllers including fuzzy rules application. The application of fuzzy can accommodate the tuning of PID gain for a non-linear process such as steam temperature. This study initiates the design of self-tuning fuzzy for FOPID controller that will automatically select the PID gains while the fractional-order was fixed. The proposed technique, named fuzzy FOPID was compared with the fuzzy PID for set point change and load disturbance test. The fuzzy FOPID controller was further improved by applying an error filter to the integrator to minimize overshoot and dampened fluctuations around the set point. The proposed fuzzy FOPID with error filter was proven to provide better control with less error index and control effort measured by Integral of Squared Error and Integral of Control signal.
2011 IEEE Control and System Graduate Research Colloquium, 2011
Abstractí Despite the application of advanced control technique to improve the performance of ele... more Abstractí Despite the application of advanced control technique to improve the performance of electro-hydraulic position control, PID control scheme seems able to produce satisfactory result. PID is preferable in industrial applications because it is simple and robust. The ...
2012 4th International Conference on Intelligent and Advanced Systems (ICIAS2012), 2012
ABSTRACT Performance of conventional PID controller was compared against the self-tuning PID with... more ABSTRACT Performance of conventional PID controller was compared against the self-tuning PID with pole-placement method for steam temperature regulation. The comparisons were done by MATLAB simulation to evaluate the performance of the controllers in terms of set point regulation, response towards set point changes and disturbance rejection. The PID was optimally-tuned using GA with model reference input that will specify the desired closed-loop trajectory during controller optimization. The self-tuning PID control on the other hand was synthesized using pole-placement with type-A PID structure. Generally, both controllers' gave satisfactory response in every aspect but the IAE index shows that the self-tuning PID was superior.
2011 IEEE 7th International Colloquium on Signal Processing and its Applications, 2011
Hydraulic systems are widely used in industrial applications. This is due to its high speed of re... more Hydraulic systems are widely used in industrial applications. This is due to its high speed of response with fast start, stop and speed reversal possible. The torque to inertia ratio is also large with resulting high acceleration capability. The nonlinear properties of hydraulic cylinder make the position tracking control design challenging. This paper presents the development and implementation of self-tuning fuzzy PID controller in controlling the position variation of electrohydraulic actuator. The hydraulic system mathematical model is approximated using system identification technique. The simulation studies were done using Matlab Simulink environment. The output performance was compared with the design using pole-placement controller. The roots mean squared error for both techniques showed that self-tuning Fuzzy PID produced better result compared to using pole-placement controller.
2012 Third International Conference on Intelligent Systems Modelling and Simulation, 2012
Steam temperature of a steam distillation process possessed variable process gain and a significa... more Steam temperature of a steam distillation process possessed variable process gain and a significant dead-time when operating from 27oC to its saturation point. Model accuracy is an important factor when tuning a PID for temperature regulation using model-based method such as open-loop Ziegler-Nichols. This study will evaluate the adequacy of two models; each estimated at different operating range using first-order
2012 IEEE 8th International Colloquium on Signal Processing and its Applications, 2012
An explicit self-tuning PID control was designed using pole-assignment method to regulate steam t... more An explicit self-tuning PID control was designed using pole-assignment method to regulate steam temperature of a steam distillation for essential oil extraction process. Online parameter estimation was involved and implemented using Recursive Least Square (RLS) method with directional forgetting. The controller performance was evaluated by simulation on second-order model identified from the process step response. Extensive analysis was done to
2011 IEEE Control and System Graduate Research Colloquium, 2011
AbstractHigh precision control has received great attention. Nowadays, as the machines are used ... more AbstractHigh precision control has received great attention. Nowadays, as the machines are used for precise operations in manufacturing field, fast and precision control for translational movement are required. In this paper, a linear digital tracking control system ...
Malaysian Journal of Paediatrics and Child Health
Congenital nasal pyriform aperture stenosis (CNPAS) is a rare cause of neonatal upper airways obs... more Congenital nasal pyriform aperture stenosis (CNPAS) is a rare cause of neonatal upper airways obstruction. It can occur as an isolated anomaly or be associated with other cranial-facial defects. Clinically, CNPAS manifests as apneic crises, episodic cyanosis, and difficulty in feeding. Here we report a newborn developing respiratory distress after birth that required oxygen support and was confirmed diagnosis of CNPAS by computed tomography (CT) scan. The newborn had successfully undergone surgical intervention via the nasolabial approach.
Advances in engineering education, 2017
Electro-Hydraulic actuator is common tools used in the industries. This is due to accurate positi... more Electro-Hydraulic actuator is common tools used in the industries. This is due to accurate positioning toward the load and fast response make it as major instruments for the industries process. This paper presents experimental work on non-recursive identification of electro-hydraulic actuator system that represented by a discrete-time model in open-loop configuration. A least square method is used to estimate the unknown parameters of the system based on auto regression with exogenous input (ARX) model. The plant mathematical model was approximated using system identification by aid of System Identification Toolbox of Matlab from open-loop input-output experimental data. These models have been validated by R2 or best fitting criterion, root mean square error and correlation analysis to determine the adequate model for representing the EHA system. By using pole-placement method, this controller is designed for the model chosen through simulation in Matlab-Simulink. The results show t...
Trajectory tracking application is widely used in industry especially for manufacturing process. ... more Trajectory tracking application is widely used in industry especially for manufacturing process. Control systems design for precise and highspeed trajectory tracking is challenging enough as the plant system model transfer function will be presented by non-minimum phase system. In this thesis, a new digital tracking control technique by utilizing feedforward adaptive ZPETC is proposed to solve the non-minimum phase problem. The proposed feedforward controller design was tested and applied on an XY table by simulation and real-time experiment. XY table is a flat surface mechanical system which facilitates horizontal motion in X and Y axes and normally used for machinery. Good controller design can provide precise trajectory motion of both axes and thus minimize the tracking and contour error of the XY table. The XY table plant discretetime models were obtained from input-output experimental data using Matlab system identification toolbox. Sampling time 45 ms was used to get nonminimu...
Malaysian Journal of Paediatrics and Child Health, 2020
Choanal atresia is an uncommon malformation of the upper airway. Bilateral choanal atresia usuall... more Choanal atresia is an uncommon malformation of the upper airway. Bilateral choanal atresia usually detected earlier as it is often associated with severe asphyxia immediately after birth. The diagnosis is often delayed in unilateral type, and mostly presented with unilateral chronic nasal discharge. This condition is rarely encountered but should be considered as a possible differential diagnosis of persistent nasal discharge. We present a case of unilateral congenital choanal atresia in a 4-month-old baby girl presented with persistent unilateral nasal discharge. Diagnostic investigation and possible surgical treatment techniques were discussed.
International Journal on Smart Sensing and Intelligent Systems, 2013
Electro-hydraulic actuators are very important tools for industrial processes because they provid... more Electro-hydraulic actuators are very important tools for industrial processes because they provide linear movement, fast response and accurate positioning of heavy load. Recently, with the research and development of mathematics, control theory and basic theory of hydraulic, hydraulic control technology has been developed and has been widely used in many applications such as industrial automation and machining processes. Due to its applications, the highest performance of the electro-hydraulic actuators on position, motion or tracking is needed. Therefore, a suitable controller is required to improve the performance of the electro-hydraulic actuator. Most researchers have used advanced control approach to improve the motion or tracking control. Based on these problems, we had done a real-time digital tracking control studies on electro-hydraulic actuator using trajectory adaptive zero phase error tracking control (ZPETC) without factorization of zero polynomial algorithm. The contro...
International Journal of Human and Health Sciences (IJHHS), 2018
Acute supraglottitis or epiglottitis is regarded as one of the feared pediatric emergency. With t... more Acute supraglottitis or epiglottitis is regarded as one of the feared pediatric emergency. With the advance in immunization, it is now less frequently seen in the group however there is an increase incidence in adult. Abscess formation following an acute episode of supraglottitis is uncommon but carries a significant morbidity and mortality. We present three cases of acute supraglottitis complicated by deep neck abscess. All of the patients required incision and drainage under general anesthesia with two of them required both intraoral and external approaches to drain the abscess. All of the patients recovered well postoperatively.International Journal of Human and Health Sciences Vol. 02 No. 03 July’18. Page : 149-154
Pediatria i Medycyna Rodzinna, 2019
Vallecular cysts are ductal cysts that form when a mucous gland or a lingual tonsillar crypt beco... more Vallecular cysts are ductal cysts that form when a mucous gland or a lingual tonsillar crypt becomes dilated due to the obstruction from inflammation, irritation or trauma. The peak incidences of vallecular cysts are bimodal; they are more frequent in children compared to the adult group. We report a case of a 22-year-old lady who presented with globus sensation for more than a year. Flexible nasopharyngolaryngoscopy revealed a huge cystic mass at the vallecula obscuring the visualisation of the laryngeal inlet. Patient successfully underwent endoscopic excision of the vallecular cyst with no intra-and postoperative complications.
International Journal of Human and Health Sciences (IJHHS), 2019
Submassteric abscess is a rare head and neck abscess. It may mimic a parotid abscess due to very ... more Submassteric abscess is a rare head and neck abscess. It may mimic a parotid abscess due to very close anatomical relationship. We present a 14-month-old child presented with fever, poor oral intake, irritability, and left-sided cheek swelling. Contrast-enhanced computed tomography of the neck showed an abscess formation in left submasseteric space. Intraoral drainage of abscess was successfully performed under general anesthesia. Patient recovered well and was discharged on day three post operatively. Subsequent follow up at one-week post operatively showed no recollection of the abscess.International Journal of Human and Health Sciences Vol. 03 No. 02 April’19. Page: 123-125
2012 IEEE International Conference on Control System, Computing and Engineering, 2012
ABSTRACT This study analyzed the effect of temperature during steam distillation extraction on th... more ABSTRACT This study analyzed the effect of temperature during steam distillation extraction on the essential oil quality. An improvised steam distillation system was applied for Cymbopogon nardus extraction with the capability to regulate the steam temperature at any desired value. The quality was evaluated using refractive index and GC-MS analysis. The results were compared with the international standard for citronella oil (BS ISO 3849:2003) and against the data gathered from literatures. The chemical compounds are much differed from literatures but complied with the minimum requirements from the ISO standard. Nonetheless, quality improvement of the yield can be observed between each sample from different temperature settings.
The European Proceedings of Multidisciplinary Sciences
The higher education system in this world has been challenged by the Covid-19 pandemic since earl... more The higher education system in this world has been challenged by the Covid-19 pandemic since early 2020 and has disturbed the normal operation of education services including UNISEL. Despite the difficulties in the new normal of strict Standard Operating Procedure (SOP) and Movement Control Order (MCO) imposed by the government, UNISEL operations especially in academic services and teaching & learning have continued as usual throughout the MCO. UNISEL has managed to sustain its operation and successfully faced the challenges. This sustainability can be well connected to the UNISEL's implementation of ISO 21001:2018 Educational Organization Management Systems (EOMS). The EOMS standard provides a general ground of education management system that can be used in any condition. The effectiveness of the EOMS implementation can be proven by the students' satisfaction survey. The instruments of this survey were divided into five aspects which are students' demographic, teaching and learning, facilities, support services, student's activities, and overall experience as a student in UNISEL. The questionnaire consists of 31 and the likert scale used was ranked from 1 to 5 for the students' satisfaction survey. The results for each aspect were then compared with previous years' data. The comparison analysis showed that there was no significant satisfaction reduction for the 2021 survey and there was a slight improvement in the teaching and learning aspects as compared to the previous year. The study proved that the EOMS standard is robust and can help education providers to sustain in challenging conditions like pandemic Covid-19.
This study evaluates the performance between reaction curve Ziegler-Nichols tuning rules applied ... more This study evaluates the performance between reaction curve Ziegler-Nichols tuning rules applied to FOPDT model and the open-loop relay feedback tuning method based on ultimate gain and period. Error and control signal switching were equipped to enhance the output response over a limited steam temperature response. The control performance was evaluated experimentally on a steam distillation process regulation. The proposed technique employing relay tuning together with error switching had produced an astounding closed-loop response even for a non-linear steam temperature control.
Optical Materials, 2021
Abstract In this work, we have synthesized (Fe2O3)1-x: (NiO)x thin films by pulsed laser depositi... more Abstract In this work, we have synthesized (Fe2O3)1-x: (NiO)x thin films by pulsed laser deposition, then study the impact of NiO doping concentrations on the linear and nonlinear optical characteristics. The optical properties were investigated by the UV–visible spectrophotometer. The transmittance was influenced by NiO doping concentrations as well as the absorption and extinction coefficients. Moreover, the band gap was found to decrease from 2.69371 to 2.41751 eV with increasing NiO contents in the Fe2O3 matrix. Furthermore, the nonlinear optical parameters were estimated based on the Wemple-DiDomenico model, the single-oscillator energy was increased from 2.29 to 2.86 eV as the dispersion energy was found to increase from 8.04 to 16.72 eV by increasing NiO doping concentrations, the third-order nonlinear susceptibility was found to increase in the doped films from 1.04 × 10–12 to 7.96 × 10–12 esu. The best result was achieved in (Fe2O3)0.98: (NiO)0.02 thin film where the highest nonlinear optical constants were obtained which make it a potential candidate in nonlinear optics (NLO) applications.
ABSTRACT This paper presents comparative studies on control performance using self-tuning Fuzzy-P... more ABSTRACT This paper presents comparative studies on control performance using self-tuning Fuzzy-PID and self-tuning Pole-Placement PID controller with application to saturated steam temperature regulation. The steam is used in the essential oil extraction process where the steam temperature must be regulated to preserve the oil quality. Online tuning using fuzzy rules did not require accurate model and hence easier to implement. On the other hand, self-tuning using pole-placement method requires the plant parameters to be updated recursively so that the controller gain can be adjusted. Result shows that self-tuning Pole-Placement PID controller performs better response.
Fractional-order PID (FOPID) control is currently an emerging topic in control engineering resear... more Fractional-order PID (FOPID) control is currently an emerging topic in control engineering research. The controller was proven to perform better than the integer-order controller because of the generalization in the integrator and differentiator power. But lately, the application has been widened into non-PID type controllers including fuzzy rules application. The application of fuzzy can accommodate the tuning of PID gain for a non-linear process such as steam temperature. This study initiates the design of self-tuning fuzzy for FOPID controller that will automatically select the PID gains while the fractional-order was fixed. The proposed technique, named fuzzy FOPID was compared with the fuzzy PID for set point change and load disturbance test. The fuzzy FOPID controller was further improved by applying an error filter to the integrator to minimize overshoot and dampened fluctuations around the set point. The proposed fuzzy FOPID with error filter was proven to provide better control with less error index and control effort measured by Integral of Squared Error and Integral of Control signal.
2011 IEEE Control and System Graduate Research Colloquium, 2011
Abstractí Despite the application of advanced control technique to improve the performance of ele... more Abstractí Despite the application of advanced control technique to improve the performance of electro-hydraulic position control, PID control scheme seems able to produce satisfactory result. PID is preferable in industrial applications because it is simple and robust. The ...
2012 4th International Conference on Intelligent and Advanced Systems (ICIAS2012), 2012
ABSTRACT Performance of conventional PID controller was compared against the self-tuning PID with... more ABSTRACT Performance of conventional PID controller was compared against the self-tuning PID with pole-placement method for steam temperature regulation. The comparisons were done by MATLAB simulation to evaluate the performance of the controllers in terms of set point regulation, response towards set point changes and disturbance rejection. The PID was optimally-tuned using GA with model reference input that will specify the desired closed-loop trajectory during controller optimization. The self-tuning PID control on the other hand was synthesized using pole-placement with type-A PID structure. Generally, both controllers' gave satisfactory response in every aspect but the IAE index shows that the self-tuning PID was superior.
2011 IEEE 7th International Colloquium on Signal Processing and its Applications, 2011
Hydraulic systems are widely used in industrial applications. This is due to its high speed of re... more Hydraulic systems are widely used in industrial applications. This is due to its high speed of response with fast start, stop and speed reversal possible. The torque to inertia ratio is also large with resulting high acceleration capability. The nonlinear properties of hydraulic cylinder make the position tracking control design challenging. This paper presents the development and implementation of self-tuning fuzzy PID controller in controlling the position variation of electrohydraulic actuator. The hydraulic system mathematical model is approximated using system identification technique. The simulation studies were done using Matlab Simulink environment. The output performance was compared with the design using pole-placement controller. The roots mean squared error for both techniques showed that self-tuning Fuzzy PID produced better result compared to using pole-placement controller.
2012 Third International Conference on Intelligent Systems Modelling and Simulation, 2012
Steam temperature of a steam distillation process possessed variable process gain and a significa... more Steam temperature of a steam distillation process possessed variable process gain and a significant dead-time when operating from 27oC to its saturation point. Model accuracy is an important factor when tuning a PID for temperature regulation using model-based method such as open-loop Ziegler-Nichols. This study will evaluate the adequacy of two models; each estimated at different operating range using first-order
2012 IEEE 8th International Colloquium on Signal Processing and its Applications, 2012
An explicit self-tuning PID control was designed using pole-assignment method to regulate steam t... more An explicit self-tuning PID control was designed using pole-assignment method to regulate steam temperature of a steam distillation for essential oil extraction process. Online parameter estimation was involved and implemented using Recursive Least Square (RLS) method with directional forgetting. The controller performance was evaluated by simulation on second-order model identified from the process step response. Extensive analysis was done to
2011 IEEE Control and System Graduate Research Colloquium, 2011
AbstractHigh precision control has received great attention. Nowadays, as the machines are used ... more AbstractHigh precision control has received great attention. Nowadays, as the machines are used for precise operations in manufacturing field, fast and precision control for translational movement are required. In this paper, a linear digital tracking control system ...
Malaysian Journal of Paediatrics and Child Health
Congenital nasal pyriform aperture stenosis (CNPAS) is a rare cause of neonatal upper airways obs... more Congenital nasal pyriform aperture stenosis (CNPAS) is a rare cause of neonatal upper airways obstruction. It can occur as an isolated anomaly or be associated with other cranial-facial defects. Clinically, CNPAS manifests as apneic crises, episodic cyanosis, and difficulty in feeding. Here we report a newborn developing respiratory distress after birth that required oxygen support and was confirmed diagnosis of CNPAS by computed tomography (CT) scan. The newborn had successfully undergone surgical intervention via the nasolabial approach.
Advances in engineering education, 2017
Electro-Hydraulic actuator is common tools used in the industries. This is due to accurate positi... more Electro-Hydraulic actuator is common tools used in the industries. This is due to accurate positioning toward the load and fast response make it as major instruments for the industries process. This paper presents experimental work on non-recursive identification of electro-hydraulic actuator system that represented by a discrete-time model in open-loop configuration. A least square method is used to estimate the unknown parameters of the system based on auto regression with exogenous input (ARX) model. The plant mathematical model was approximated using system identification by aid of System Identification Toolbox of Matlab from open-loop input-output experimental data. These models have been validated by R2 or best fitting criterion, root mean square error and correlation analysis to determine the adequate model for representing the EHA system. By using pole-placement method, this controller is designed for the model chosen through simulation in Matlab-Simulink. The results show t...
Trajectory tracking application is widely used in industry especially for manufacturing process. ... more Trajectory tracking application is widely used in industry especially for manufacturing process. Control systems design for precise and highspeed trajectory tracking is challenging enough as the plant system model transfer function will be presented by non-minimum phase system. In this thesis, a new digital tracking control technique by utilizing feedforward adaptive ZPETC is proposed to solve the non-minimum phase problem. The proposed feedforward controller design was tested and applied on an XY table by simulation and real-time experiment. XY table is a flat surface mechanical system which facilitates horizontal motion in X and Y axes and normally used for machinery. Good controller design can provide precise trajectory motion of both axes and thus minimize the tracking and contour error of the XY table. The XY table plant discretetime models were obtained from input-output experimental data using Matlab system identification toolbox. Sampling time 45 ms was used to get nonminimu...
Malaysian Journal of Paediatrics and Child Health, 2020
Choanal atresia is an uncommon malformation of the upper airway. Bilateral choanal atresia usuall... more Choanal atresia is an uncommon malformation of the upper airway. Bilateral choanal atresia usually detected earlier as it is often associated with severe asphyxia immediately after birth. The diagnosis is often delayed in unilateral type, and mostly presented with unilateral chronic nasal discharge. This condition is rarely encountered but should be considered as a possible differential diagnosis of persistent nasal discharge. We present a case of unilateral congenital choanal atresia in a 4-month-old baby girl presented with persistent unilateral nasal discharge. Diagnostic investigation and possible surgical treatment techniques were discussed.
International Journal on Smart Sensing and Intelligent Systems, 2013
Electro-hydraulic actuators are very important tools for industrial processes because they provid... more Electro-hydraulic actuators are very important tools for industrial processes because they provide linear movement, fast response and accurate positioning of heavy load. Recently, with the research and development of mathematics, control theory and basic theory of hydraulic, hydraulic control technology has been developed and has been widely used in many applications such as industrial automation and machining processes. Due to its applications, the highest performance of the electro-hydraulic actuators on position, motion or tracking is needed. Therefore, a suitable controller is required to improve the performance of the electro-hydraulic actuator. Most researchers have used advanced control approach to improve the motion or tracking control. Based on these problems, we had done a real-time digital tracking control studies on electro-hydraulic actuator using trajectory adaptive zero phase error tracking control (ZPETC) without factorization of zero polynomial algorithm. The contro...
International Journal of Human and Health Sciences (IJHHS), 2018
Acute supraglottitis or epiglottitis is regarded as one of the feared pediatric emergency. With t... more Acute supraglottitis or epiglottitis is regarded as one of the feared pediatric emergency. With the advance in immunization, it is now less frequently seen in the group however there is an increase incidence in adult. Abscess formation following an acute episode of supraglottitis is uncommon but carries a significant morbidity and mortality. We present three cases of acute supraglottitis complicated by deep neck abscess. All of the patients required incision and drainage under general anesthesia with two of them required both intraoral and external approaches to drain the abscess. All of the patients recovered well postoperatively.International Journal of Human and Health Sciences Vol. 02 No. 03 July’18. Page : 149-154
Pediatria i Medycyna Rodzinna, 2019
Vallecular cysts are ductal cysts that form when a mucous gland or a lingual tonsillar crypt beco... more Vallecular cysts are ductal cysts that form when a mucous gland or a lingual tonsillar crypt becomes dilated due to the obstruction from inflammation, irritation or trauma. The peak incidences of vallecular cysts are bimodal; they are more frequent in children compared to the adult group. We report a case of a 22-year-old lady who presented with globus sensation for more than a year. Flexible nasopharyngolaryngoscopy revealed a huge cystic mass at the vallecula obscuring the visualisation of the laryngeal inlet. Patient successfully underwent endoscopic excision of the vallecular cyst with no intra-and postoperative complications.
International Journal of Human and Health Sciences (IJHHS), 2019
Submassteric abscess is a rare head and neck abscess. It may mimic a parotid abscess due to very ... more Submassteric abscess is a rare head and neck abscess. It may mimic a parotid abscess due to very close anatomical relationship. We present a 14-month-old child presented with fever, poor oral intake, irritability, and left-sided cheek swelling. Contrast-enhanced computed tomography of the neck showed an abscess formation in left submasseteric space. Intraoral drainage of abscess was successfully performed under general anesthesia. Patient recovered well and was discharged on day three post operatively. Subsequent follow up at one-week post operatively showed no recollection of the abscess.International Journal of Human and Health Sciences Vol. 03 No. 02 April’19. Page: 123-125