2024-03-28T21:04:42Z
https://ijste.shirazu.ac.ir/?_action=export&rf=summon&issue=212
Iranian Journal of Science and Technology Transactions of Electrical Engineering
2228-6179
2228-6179
2010
34
6
Vision-based bone image recognition using geometric properties
An effective approach for bone image anal­ysis, including segmentation and recognition is presented in this paper. Bone segmenta­tion is carried out by K-means clustering of the bone image, whereas the recognition phase is based on fea­ture extraction and two-level statistical classification. The proposed approach has applications in medicine and vet­erinary anatomy studies, orthopedics, paleontology and archaeology. Several image features, including geomet­ric and moment invariants (regular and Zernike), are de­rived for recognition. The first-level classification is used to distinguish different kinds of bone and the second-level to recognize the right animal to which the bone belongs. Two-dimensional structures, called cluster-property and cluster-features matrices, have been employed to evalu­ate different bone characteristics. Experimental results for the first-level recognition exhibit better performance of the geometric features compared to moment invariants and Zernike moments. On the other hand, Zernike moments showed supremacy in differential diagnosis at the second level to recognize animals.
Visual properties
bone recognition
geometric features
2010
12
26
597
604
https://ijste.shirazu.ac.ir/article_827_06b8990c38abfdd82d8f23f597a43c80.pdf
Iranian Journal of Science and Technology Transactions of Electrical Engineering
2228-6179
2228-6179
2010
34
6
Enhancement of micro-grid dynamic performance subsequent to islanding process using storage batteries
Recently, several types of Distributed Generators (DGs) have been connected together to form a small power system called a micro grid (MG). MG usually operates in normal connecting mode and is connected to the main grid. If a fault occurs in the main grid, MG will transfer immediately to the islanding mode. This paper developed a complete model which can simulate, in detail, the dynamic performance of the MG during and subsequent to islanding occurrence. The developed model is used to investigate the effect of using storage batteries for enhancing MG dynamic performance during all modes. Two cases are studied, the first case discusses the effect of the islanding process on the frequency, voltages and active powers of all micro sources when there are no storage batteries installed inside the MG. The second studied case investigates the effect of islanding occurrence on the MG performance when MG is equipped with two storage batteries. In the two studied cases, wind speed and irradiance vary continuously. Results proved that the existence of storage batteries led to dramatic improvement in the dynamic performance of the MG during subsequent islanding occurrence. Also, MG performance, when exposed to a severe disturbance, led to an unacceptable frequency drop is studied and load shedding strategy activation during this situation is also highlighted.
MG
dynamic performance
islanding
micro sources
inverter
storage batteries and load shedding
2010
12
26
605
618
https://ijste.shirazu.ac.ir/article_828_ea22b0fb00b159bb10b11d129cc763bc.pdf
Iranian Journal of Science and Technology Transactions of Electrical Engineering
2228-6179
2228-6179
2010
34
6
Competitive distribution system planning model integration of DG, interruptible load and voltage regulator devices
Distribution systems management is becoming an increasingly complicated issue due to the introduction of new technologies, new energy trading strategies, and new deregulated environment. In the new deregulated energy market and considering the incentives coming from the technical and economical fields, it is reasonable to consider Distributed Generation (DG) as a viable option to solve the lacking electric power supply problem. This paper presents a mathematical distribution system planning model considering three planning options to system expansion and to meet the load growth requirements with a reasonable price as well as the system power quality problems. DG is introduced as an attractive planning option in competition with voltage regulator devices and Interruptible load. In the mathematical model, the objective function includes investment costs, which are evaluated as annualized total cost, plus the total running cost as well as the cost of curtailed loads and losses. This model identifies the optimal type, size, and location of the planning options. This paper also studies the fluctuation of the load and electricity market price versus time period, and the effect of DG placement on system improvement. To solve the proposed mathematical planning model a new software package by interfacing MATLAB and GAMS is developed. This package enables one to solve large extent distribution system planning program visually and very fast. The proposed methodology is tested on the case of the well-known IEEE 30-bus test system.
deregulation
distributed generation (DG)
distribution company (DISCO)
GAMS-MATLAB interface
interruptible load (IL)
Optimization
2010
12
26
619
635
https://ijste.shirazu.ac.ir/article_829_eb7aa78ddb08525e0a469a2b3c3b552c.pdf
Iranian Journal of Science and Technology Transactions of Electrical Engineering
2228-6179
2228-6179
2010
34
6
Constant input power control of three-phase isolated buck+boost rectifier
A novel control method is proposed for single-stage three-phase isolated buck+boost rectifier. The control method is based on the conventional cascade two-loop control structure and is modified to achieve constant instantaneous input power. Input voltages, output voltage, and DC-link inductor current are measured to control the power switches to achieve output voltage regulation as well as input power factor correction. In the proposed method, input currents are controlled such that input power is constant, even for unbalanced mains. Thus, for the balanced mains converter it behaves like an ideal rectifier, and for unbalanced mains, low-frequency harmonics of the output voltage are suppressed. The performance of the proposed control structure is verified by the numerical simulation of a 6kW, 380V/48Vdc designed prototype.
Three-phase single-stage power supply
buck+boost rectifier
unbalanced mains
power factor correction
2010
12
26
637
648
https://ijste.shirazu.ac.ir/article_830_b3c6bf5c4eaa71de1973af830e34ee2d.pdf
Iranian Journal of Science and Technology Transactions of Electrical Engineering
2228-6179
2228-6179
2010
34
6
Practical implementation of multi-motor drives for wide span gantry cranes
This paper relates to rail mounted wide span gantry cranes and especially to the design of anti-skewing controller. The hereby presented algorithm provides skew elimination according to a simple, efficient and practically applicable method based on two absolute encoders and a skew controller realized in PLC. A safe and reliable operation, even in the case of components failure requires an additional compensator with minimal hardware requirements. Design points are outlined and characteristic results are shown. The proposed solution is experimentally verified in different industry branches
Frequency converter
multi motor drive
skew controller
2010
12
26
649
654
https://ijste.shirazu.ac.ir/article_831_93e5d8d67b36f23ded167391b60024fb.pdf