Articles published in IJEER


A Robust Image Mosaicing Technique Using Frequency Domain

“Mosaic” originates from an Old Italian word “mosaico” which means a picture or pattern produced by arranging together small pieces of stone, tile, glass etc. The input images which are to be stitched can be two or more than that and is better understood from the geometric relationship between them [1, 2]. It has got many real time applications. Panorama is very common example which is used in our daily life. Image mosaicing algorithm is broadly divided into two categories: spatial domain based and frequency domain based. Spatial domain based is further classified into area based and feature based image mosaicing. So SURF (Speeded-Up Robust Features) algorithm implemented completely works in the spatial domain to generate the mosaiced image. In the proposed methodology the corresponding information or details in each individual image scenes in spatial and temporal domain can be combined to generate scene using images of smaller field of view. In frequency domain FFT (Fast Fourier Transform) approach has been used.

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Voltage Control of On-Load Tap Changing Transformer in Distributed Network

This paper deals with the basic concept of tap changing of transformer, types of tap changer and various voltage control methods used for On-load tap changing transformer in distribution network. These methods depend upon the series and parallel operation of On Load Tap Changing Transformer. In parallel operation-automatic voltage controller and low drop compensation controller are used. While in series operation grading time and communication based voltage control methods are used.

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Development of an Improved Model for Assessment of Hot Spot Temperature of Current Transformers

This research paper develops an improved model for assessment of hot spot temperature from the IEEE top-oil rise temperature model by considering the ambient temperature at the first-order characterization using appropriate mathematical notations. The ambient temperature, top oil rise over temperature and winding hot spot rise over temperature were used as input parameters for the development of the improved hot spot temperature model by considering the final temperature state since the time-rate-of change in top-oil temperature is driven by the difference between the exits top-oil temperature for ambient temperature variation. The improved model was then implemented in MATLAB to compute the hot spot temperature for 24-hour load cycle. The result of the improved model shows that the least and highest value of the hot spot temperature are 630C and 105.40C respectively indicating a retardation in the aging process of the transformers. The improved model helps to minimize the risk of failure and to extend the life span of transformers thereby controlling the hot spot temperature rise and top oil temperature.

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Impact of System Average Interruption Duration Index Threshold on the Reliability Assessment of Electrical Power Distribution Systems

This research paper presents the impact of SAIDI threshold on the reliability assessment of electrical power distribution system. Data were collected from ten selected feeders of Ibadan distribution system for a period of five years. The daily SAIDI, natural logarithm of SAIDI, the log-average of SAIDI and the standard derivation of the logarithm of SAIDI were used as input parameters in the development of SAIDI threshold model. The result of the research paper shows that the SAIDI threshold values fluctuate over the years with the least and highest SAIDI threshold values as 2.11596 and 4.62518 respectively which were recorded in the months of September and April. The SAIDI thresholds in the months of January, February, March, April, May and June are 3.18318, 3.32458, 4.22242, 4.62518, 2.71360 and 3.27760 respectively suggesting an indefinite pattern in the SAIDI threshold as a result of unexpected interruptions experienced by customers attached to the distribution feeders. SAIDI threshold forms a basis for power system planning and maintenance strategies.

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Design Of Modified Data Driven Clock Gating And Look Ahead Clock Gating For Low Power

In this paper data driven clock gating and look ahead clock gating with modified design is done in the cadence virtuoso tool to obtain the very low power,low noise response,lesser delay,lesser bandwidth and efficient reliability in the electronic devices.The power consumption detail is obtained accurately in the cadence virtuoso power calculator window and also the noise response is also calculated using the same calculator window.The DC response analysis is also obtained for the modified design.

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Distributed Control System Application for Distillation Column

The entangled nature of various continuous production processes, such as chemical processing, oil and gas, and water treatment, continue to require the advanced process control capabilities of the Distributed control system (DCS) in order to aggregate and analyse a large amount of data at the same instant of time. This paper aims to enhance the flexibility in controlling and monitoring of distillation column by configuring and developing a HMI using DCS with SCADA. DCS provides high scalability, solutions to complexity, redundancy, high adaptability to frequent process changes, hybridized to incorporate PLCs and PCs to control complex functions and to provide reporting services. Hence the optimized control of distillation column has been achieved via DCS.

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Simulation of Pentagon Shaped Multiband Antenna using Proximity Coupled Technique

Author have gone through a detailed literature review, after the research it was found that among the various available techniques to design multiband patch antenna, proximity coupled technique was found more suitable and efficient to design a multiband antenna. This simulated antenna is a three-band antenna which has the capability to operate at three distinguished frequencies. This proposed design of proximity coupled technique has comb like structure contains no defected ground, a pentagonal shaped patch and a meandered feed, which is designed to connect a SMA connector. Designed antenna is a 3-layer device having higher radiation intensity at 3.18, 4.36 and 5.18GHz.

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Case Study of the Contact Failure of an Oil Temperature Sensor of an Automotive Transmission

In this study, we investigated the cause of the contact failure phenomenon of an oil temperature sensor whose signal error occurred intermittently as the vehicle in which it was installed was driving. The electrical contact failed sensor was disassembled and the contact surfaces observed with a scanning electron microscope (SEM). In this present oil temperature sensor, the difference in the thermal expansion coefficient of the male-female terminal and vibration during driving which arose when the vehicle was driven caused fretting corrosion at the contact area. The fretting corrosion caused an intermittent signal error. It is judged that the lead wire of the flexible thin plate is structurally vulnerable to vibration during driving, which further causes fretting of the contact point. Therefore, it is necessary to design an additional structural supplement to fix the flexible terminal of the sensor system.

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Extraction and Conversion of Exhaust Heat from Automobile Engine in to Electrical Energy

Energy is vital for the progress of the nation and it has to be conserved in an efficient manner. Nowadays increasing worldwide problem is shortage of energy. In an Automobile out of the total heat supplied to the engine in the form of fuel, approximately 30 to 40 percent is converted into useful mechanical work and the remaining heat is expelled out as waste heat. This paper focus on the recovery and utilization of waste heat into useful electrical energy by using See back effect where in Thermoelectric Generators (TEG) are placed on the exhaust surface for converting heat directly into electrical energy. Thermoelectric generators are highly doped semiconductor solid state devices. The output voltage of the thermoelectric generator is given to a dc super lift converter circuit. The output of the super lift converter is used for battery charging.

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