Journal of Nonlinear Optical Physics & Materials, 2001
Optical logic gates for OR-AND-NOT, NOR and exclusive-XNOR operations in waveguides consisting of... more Optical logic gates for OR-AND-NOT, NOR and exclusive-XNOR operations in waveguides consisting of nonlinear material are numerically investigated by means of FD-BPM (Finite Difference Beam Propagation Method). The proposed devices are designed utilizing the self-routing characteristics of nonlinear X-crossing and Y-branching structures when they are operated with one input beam or two. The numerical simulations show that the proposed structures can favorably be applied to optical data processing and computing as fundamental logic gates.
This paper presents a new topology of three-level transformer-less photovoltaic (PV) inverter. In... more This paper presents a new topology of three-level transformer-less photovoltaic (PV) inverter. In this topology, a 240V AC system is developed from a full bridge inverter circuit using PIC microcontroller (PIC16F628A-I/P) connected to an array of PV panel through a power factor correction circuit. The output waveform of the inverter depends on the type of pulse driver. The inverter is connected to the utility supply, on the clear day, the ac load is served by the inverter but on the cloudy day or night where solar irradiance is low, the inverter through its PIC microcontroller automatically changes from the usage of inverter to the utility supply. Objective of this paper is to optimize the maximum voltage angle to obtain the lowest current total harmonic distortion (CTHD) of the uninterruptible power supply (UPS) on the three-level single phase transformer-less inverter. In this paper, the maximum voltage angle optimization of the AC three-level waveform transformer-less PV inverter is developed and created by a microcontroller PIC16F627A-I/P changing maximum voltage angle of the AC three-level waveform from 20° to 180°. Resistive load of 30 W lamp and inductive load of 20 W water pump are applied to the transformer-less PV single phase inverter. The result shows that the lowest CTHD of 15.448% is obtained when the maximum voltage angle is 134°.
The latest generation of FACTS devices, the convertible static compensator (CSC) [1], is the prog... more The latest generation of FACTS devices, the convertible static compensator (CSC) [1], is the progress of several innovative operating concepts in the historic development and application FACTS. One of the concepts is the GUPFC or multi-line UPFC have been done, which can control bus voltage and power flows of more than one line or according to even a sub-network. The GUPFC should have stronger control capability than the UPFC. In this paper it derived to pile up a novel concept of a mathematical model for the GUPFC consisting of one shunt converter and two or more series converters based on voltage source converter (VSCs) and DC link capacitor is developed and implemented in the nonlinear predictor-corrector primal-dual interior-point OPF algorithm. Numerical results with various GUPFC devices based on the IEEE 30 bus power system demonstrate the feasibility as well as the effectiveness of the GUPFC model established in the OPF method.
Hasil simulasi menunjukkan bahwa tegangan lebih transien terjadi di sepanjang saluran distribusi ... more Hasil simulasi menunjukkan bahwa tegangan lebih transien terjadi di sepanjang saluran distribusi dengan tegangan semakin besar jika panjang saluran semakin besar. Besarnya tegangan lebih transien yang terjadi pada saluran tersebut dapat digunakan sebagai pertimbangan dalam menentukan proteksi peralatan.
The employment of Inertial Measurement Unit (IMU) to measure the acceleration and angular rate in... more The employment of Inertial Measurement Unit (IMU) to measure the acceleration and angular rate in three axes is an important part of the navigation control system. The motion of an object (e.g. a rocket) has very wide range of acceleration at the forward axis. To obtain optimum sensitivities of all sensors, multigain accelerometer sensors should be looked into. For this a three axes accelerometer sensor (MMA7260Q) and three angular rate sensor (ADXRS150) on the three axes. Before each analog signal from sensor is imported into ADC, it should be filtered by low pass analog filter. We use a rolling average for each low pass filter, discrimination window, movement end check, and integration process to get the angle from gyroscope sensor signal and position from accelerometer sensor signal. Therefore, it is necessary to obtain the optimum of measurement. In this paper, we propose an algorithm to select the accelerometer sensor with multigain. The results show that the error averages of estimated distances in x-axis, y-axis, and z-axis are respectively 1.64%, 1.37%, and 2.73%. The error averages of the estimated angles on clockwise rotation of three axes are 0.49%, 0.77%, and 0.38% respectively, whereas for counter clockwise rotations of three axes are respectively 0.40%, 0.60%, and 0.36%.
The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high populati... more The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high population densities, mass movements are generally damaging and fatal. More than other Javanese mountains, the Menoreh Mountains cumulate several factors causing landslides. Therefore, it is necessary to evaluate the ways to map landslide risk in order to improve the risk mitigation. The objectives of this paper are to provide landslide hazard and risk assessment that will be useful for risk prevention and landuse planning in the Menoreh Mountains. So far, risk management has been developed by the Research Centre for Disasters Gadjah Mada University in collaboration with the Regional Development Planner (BAPPEDA), which carries out fundamental and applied researches. The results of the studies have been integrated in the risk prevention and landuse planning in order to improve the integrated landslide mitigation programme.
The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high populati... more The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high population densities, mass movements are generally damaging and fatal. More than other Javanese mountains, the Menoreh Mountains cumulate several factors causing landslides. Therefore, it is necessary to evaluate the ways to map landslide risk in order to improve the risk mitigation. The objectives of this paper are to provide landslide hazard and risk assessment that will be useful for risk prevention and landuse planning in the Menoreh Mountains. So far, risk management has been developed by the Research Centre for Disasters Gadjah Mada University in collaboration with the Regional Development Planner (BAPPEDA), which carries out fundamental and applied researches. The results of the studies have been integrated in the risk prevention and landuse planning in order to improve the integrated landslide mitigation programme.
Journal of Nonlinear Optical Physics & Materials, 2001
Optical logic gates for OR-AND-NOT, NOR and exclusive-XNOR operations in waveguides consisting of... more Optical logic gates for OR-AND-NOT, NOR and exclusive-XNOR operations in waveguides consisting of nonlinear material are numerically investigated by means of FD-BPM (Finite Difference Beam Propagation Method). The proposed devices are designed utilizing the self-routing characteristics of nonlinear X-crossing and Y-branching structures when they are operated with one input beam or two. The numerical simulations show that the proposed structures can favorably be applied to optical data processing and computing as fundamental logic gates.
This paper presents a new topology of three-level transformer-less photovoltaic (PV) inverter. In... more This paper presents a new topology of three-level transformer-less photovoltaic (PV) inverter. In this topology, a 240V AC system is developed from a full bridge inverter circuit using PIC microcontroller (PIC16F628A-I/P) connected to an array of PV panel through a power factor correction circuit. The output waveform of the inverter depends on the type of pulse driver. The inverter is connected to the utility supply, on the clear day, the ac load is served by the inverter but on the cloudy day or night where solar irradiance is low, the inverter through its PIC microcontroller automatically changes from the usage of inverter to the utility supply. Objective of this paper is to optimize the maximum voltage angle to obtain the lowest current total harmonic distortion (CTHD) of the uninterruptible power supply (UPS) on the three-level single phase transformer-less inverter. In this paper, the maximum voltage angle optimization of the AC three-level waveform transformer-less PV inverter is developed and created by a microcontroller PIC16F627A-I/P changing maximum voltage angle of the AC three-level waveform from 20° to 180°. Resistive load of 30 W lamp and inductive load of 20 W water pump are applied to the transformer-less PV single phase inverter. The result shows that the lowest CTHD of 15.448% is obtained when the maximum voltage angle is 134°.
The latest generation of FACTS devices, the convertible static compensator (CSC) [1], is the prog... more The latest generation of FACTS devices, the convertible static compensator (CSC) [1], is the progress of several innovative operating concepts in the historic development and application FACTS. One of the concepts is the GUPFC or multi-line UPFC have been done, which can control bus voltage and power flows of more than one line or according to even a sub-network. The GUPFC should have stronger control capability than the UPFC. In this paper it derived to pile up a novel concept of a mathematical model for the GUPFC consisting of one shunt converter and two or more series converters based on voltage source converter (VSCs) and DC link capacitor is developed and implemented in the nonlinear predictor-corrector primal-dual interior-point OPF algorithm. Numerical results with various GUPFC devices based on the IEEE 30 bus power system demonstrate the feasibility as well as the effectiveness of the GUPFC model established in the OPF method.
Hasil simulasi menunjukkan bahwa tegangan lebih transien terjadi di sepanjang saluran distribusi ... more Hasil simulasi menunjukkan bahwa tegangan lebih transien terjadi di sepanjang saluran distribusi dengan tegangan semakin besar jika panjang saluran semakin besar. Besarnya tegangan lebih transien yang terjadi pada saluran tersebut dapat digunakan sebagai pertimbangan dalam menentukan proteksi peralatan.
The employment of Inertial Measurement Unit (IMU) to measure the acceleration and angular rate in... more The employment of Inertial Measurement Unit (IMU) to measure the acceleration and angular rate in three axes is an important part of the navigation control system. The motion of an object (e.g. a rocket) has very wide range of acceleration at the forward axis. To obtain optimum sensitivities of all sensors, multigain accelerometer sensors should be looked into. For this a three axes accelerometer sensor (MMA7260Q) and three angular rate sensor (ADXRS150) on the three axes. Before each analog signal from sensor is imported into ADC, it should be filtered by low pass analog filter. We use a rolling average for each low pass filter, discrimination window, movement end check, and integration process to get the angle from gyroscope sensor signal and position from accelerometer sensor signal. Therefore, it is necessary to obtain the optimum of measurement. In this paper, we propose an algorithm to select the accelerometer sensor with multigain. The results show that the error averages of estimated distances in x-axis, y-axis, and z-axis are respectively 1.64%, 1.37%, and 2.73%. The error averages of the estimated angles on clockwise rotation of three axes are 0.49%, 0.77%, and 0.38% respectively, whereas for counter clockwise rotations of three axes are respectively 0.40%, 0.60%, and 0.36%.
The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high populati... more The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high population densities, mass movements are generally damaging and fatal. More than other Javanese mountains, the Menoreh Mountains cumulate several factors causing landslides. Therefore, it is necessary to evaluate the ways to map landslide risk in order to improve the risk mitigation. The objectives of this paper are to provide landslide hazard and risk assessment that will be useful for risk prevention and landuse planning in the Menoreh Mountains. So far, risk management has been developed by the Research Centre for Disasters Gadjah Mada University in collaboration with the Regional Development Planner (BAPPEDA), which carries out fundamental and applied researches. The results of the studies have been integrated in the risk prevention and landuse planning in order to improve the integrated landslide mitigation programme.
The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high populati... more The Menoreh Mountains in Yogyakarta are severely affected by landslides. Due to the high population densities, mass movements are generally damaging and fatal. More than other Javanese mountains, the Menoreh Mountains cumulate several factors causing landslides. Therefore, it is necessary to evaluate the ways to map landslide risk in order to improve the risk mitigation. The objectives of this paper are to provide landslide hazard and risk assessment that will be useful for risk prevention and landuse planning in the Menoreh Mountains. So far, risk management has been developed by the Research Centre for Disasters Gadjah Mada University in collaboration with the Regional Development Planner (BAPPEDA), which carries out fundamental and applied researches. The results of the studies have been integrated in the risk prevention and landuse planning in order to improve the integrated landslide mitigation programme.
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