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29,082 Article Results

Performance of STATCOM-ES in Mitigating SSR

10.11591/ijpeds.v8.i4.pp1822-1829
Mala R.C , Nagesh Prabhu , Gururaja Rao H.V
One of the advanced power applications using energy storage is the integration of energy storage technologies with VSC-based FACTS controllers. With the support of energy storage device, FACTS controllers will have the ability to exchange active power or energy with the ac network in steady state. This paper discusses the impact of Static Synchronous Compensator incorporating energy storage device (STATCOM-ES) on subsynchronous resonance (SSR). It also proposes the design of an auxiliary SSR damping controller (SSDC) for STATCOM-ES to damp the subsynchronous oscillations which the system is undergoing because of a series capacitor in the transmission system. The system under consideration is IEEE FBM which is modified to incorporate STATCOM-ES at the electrical midpoint. The investigation of SSR characteristics when a STATCOM - ES operating in bus voltage regulation mode is carried out by eigenvalue and damping torque analysis. Transient analysis based on the nonlinear model is also performed to validate the results obtained by conventional methods.
Volume: 8
Issue: 4
Page: 1822-1829
Publish at: 2017-12-01

Effects of Shadowing on LoRa LPWAN Radio Links

10.11591/ijece.v7i6.pp2970-2976
Mohamed Hadi Habaebi , Israth Jahan Chowdhury , Md Rafiqul Islam , Nur Aishah Binti Zainal
LoRaWAN is a long-range, low-power, wireless telecommunications method; expected to play a big role for the Internet of Things. End appliances use LoRaWAN through a single wireless hop to communicate with gateways linked to the Internet that function as transparent bridges relaying messages amongst these end-devices and a central network server. This technology youtes a combination of extended range, low power utilization and protected data communication and is gaining significant traction in IoT networks being deployed by wireless network operators. However, no comprehensive evaluation of the technology exists in the open literature. The main intention of this paper is to investigate the effects of shadowing on LoRaWAN links and analyze the performance in terms of packet loss ratio for different physical layer settings. Results indicate large differences in performance when shadowing is taken into consideration upsetting the expected performance tremendously.
Volume: 7
Issue: 6
Page: 2970-2976
Publish at: 2017-12-01

Electric Filed Intensity of the Lightning Strikes on Lightning Air Terminals Installed on Building Structures

10.11591/ijece.v7i6.pp3105-3113
Irshad Ullah , MNR Baharom , H.M. Luqman , H. Ahmad , Zainab Zainal
Lightning activities are growing up rapidly with global warming. It can affect anything on the earth. All the constructed buildings need proper protection from the harmful effect of lightning. Lightning strike points on different geometrical shapes have been investigated. Lightning strike distribution of different building structure is very important to be studied. In order to analyse the maximum effect of lightning strike pattern is obtained of different air terminals installed on scaled building structures. High voltage impulse generator is used in order to get the impulse voltage. Different numbers of air terminals have been applied to all the shapes in order to see the lightning strike points. Electric field is obtained in order to see its minimum and maximum effect on the entire building structure. Interestingly the phenomenon of lightning air terminal bypasses has been proved in this paper.
Volume: 7
Issue: 6
Page: 3105-3113
Publish at: 2017-12-01

Ultra-Wideband Monostatic Antenna for behind the Wall Detection

10.11591/ijece.v7i6.pp2936-2941
Jawad Ali , Roshayati Yahya , Noorsaliza Abdullah , Syarfa Zahirah Sapuan
This article introduces an ultra-wideband (UWB) shifted arc antenna, designed using Rogers RT-5880 Duroid substrate for the human detection behind the wall. The frequency for this proposed antenna ranges from 2.8 - 15.6 GHz with the gain of around 6.05 dB. A high gain for antenna has been achieved by the implementation of defected ground structure (DGS) method to make it a suitable configuration for through wall detection applications. For the verification of through wall detection configuration, a simulation-based experiment using ground penetrating radar (GPR) technology has been conducted. The results showed that proposed single antenna can act as a monostatic transceiver in order to detect human skin behind the concrete wall. Later, the reflections received from the target have been analyzed to detect and identify the antenna, wall and target for distance calculation.
Volume: 7
Issue: 6
Page: 2936-2941
Publish at: 2017-12-01

Dielectrophoresis Effect of Dielectric Liquids with Suspended Cellulose Impurities under DC Electric Field

10.11591/ijece.v7i6.pp3254-3261
Muhamad Hafiy Syazwan Zainoddin , Hidayat Zainuddin , Aminudin Aman
For decades, petroleum-based mineral oils are the insulating media conventionally used in the industry, particularly for high voltage (HV) applications. However, due to the disadvantages of mineral oils, there is growing interest in replacing these oils with environmentally friendly alternatives in order to fulfill the demanding requirements of dielectric liquids.  One of the promising substitutes for mineral oils is ester oils. Nevertheless, the implementation of ester oils is not widespread compared with mineral oils due to the lack of understanding on the performance of ester oils in HV applications. Hence, the objective of this study is to investigate the bridging phenomenon of two dielectric liquids with different viscosities: palm fatty acid ester and mineral oil under the influence of direct current electric field. The results show that oil viscosity plays an important role in the formation of cellulose bridge and breakdown behavior.
Volume: 7
Issue: 6
Page: 3254-3261
Publish at: 2017-12-01

Denial of impedance for Mobile Cellular Systems

10.11591/ijeecs.v8.i3.pp657-661
Ms. Dhanya.T
Wireless network broadly utilized today incorporate, cell system, remote cross section system (WMNs), remote neighbourhood and individual zone system. The expanding interest for these systems has transformed range into a valuable asset. Consequently, there is dependably a requirement for techniques to pack more bits/Hz. In this paper, we list the purposes behind this far reaching doubt, and talk about how present and future patterns will expand the need and reasonability of multiuser collectors for both the uplink, where numerous offbeat clients will be all the while identified, and the downlink, where clients will be planned and generally orthogonal zed, yet the portable handset will in any case need to adapt to a couple of predominant meddling base stations. New results for impedance wiping out beneficiaries that utilization traditional front finishes are appeared to ease a large number of the deficiencies of earlier systems, especially for the testing uplink. This paper gives a diagram of key late research leaps forward on obstruction cancelation, and highlights framework level contemplations for future multiuser recipients.
Volume: 8
Issue: 3
Page: 657-661
Publish at: 2017-12-01

Adaptive Projective Lag Synchronization of T and Lu Chaotic Systems

10.11591/ijece.v7i6.pp3446-3453
Hamed Tirandaz , Mohsen Ahmadnia , Hamid Reza Tavakoli
In this paper, the synchronization problem of T chaotic system and Lu chaotic system is studied. The parameter of the drive T chaotic system is considered unknown. An adaptive projective lag control method and also parameter estimation law are designed to achieve chaos synchronization problem between two chaotic systems. Then Lyapunov stability theorem is utilized to prove the validity of the proposed control method. After that, some numerical simulations are performed to assess the performance of the proposed method. The results show high accuracy of the proposed method in control and synchronization of chaotic systems.
Volume: 7
Issue: 6
Page: 3446-3453
Publish at: 2017-12-01

Performance Evaluation of UDP, DCCP, SCTP and TFRC for Different Traffic Flow in Wired Networks

10.11591/ijece.v7i6.pp3552-3557
Ali Hussein Wheeb
The demand for internet applications has increased rapidly.  Providing quality of service (QoS) requirements for varied internet application is a challenging task. One important factor that is significantly affected on the QoS service is the transport layer. The transport layer provides end-to-end data transmission across a network. Currently, the most common transport protocols used by internet application are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). Also, there are recent transport protocols such as DCCP (data congestion control protocol), SCTP (stream congestion transmission protocol), and TFRC (TCP-friendly rate control), which are in the standardization process of Internet Engineering Task Force (IETF). In this paper, we evaluate the performance of  UDP, DCCP, SCTP and TFRC protocols for different traffic flows: data transmission, video traffic, and VOIP in wired networks. The performance criteria used for this evaluation include throughput, end to end delay, and packet loss rate. Well-known network simulator NS-2 used to implement the UDP, DCCP, SCTP, and TFRC protocols performance comparison. Based on the simulation results, the performance throughput of  SCTP and TFRC is better than UDP. Moreover, DCCP performance is superior SCTP and TFRC in term of end-to-end delay.
Volume: 7
Issue: 6
Page: 3552-3557
Publish at: 2017-12-01

Bidirectional Resonant DC-DC converter for Microgrid Applications

10.11591/ijpeds.v8.i4.pp1548-1561
Jaisudha S. , Sowmiya Srinivasan , Kanimozhi Gunasekaran
This paper proposes a non-isolated soft-switching bidirectional dc/dc converter for interfacing energy storage in DC microgrid. The proposed converter employs a half-bridge boost converter at input port followed by a LCC resonant tank to assist in soft-switching of switches and diodes, and finally a voltage doubler circuit at the output port to enhance the voltage gain by two times. The LCC resonant circuit also adds a suitable voltage gain to the converter. Therefore, overall high voltage gain of the converter is obtained without a transformer or large number of multiplier circuit. For operation in buck mode, the high side voltage is divided by half with capacitive divider to gain higher step-down ratio. The converter is operated at high frequency to obtain low output voltage ripple, reduced magnetics and filters. Zero voltage turn-on is achieved for all switches and zero current turn-on and turn-off is achieved for all diodes in both modes i.e., buck/boost operation. Voltage stress across switches and diode is clamped naturally without external snubber circuit. An experimental prototype has been designed, built and tested in the laboratory to verify the performance of the proposed converter.
Volume: 8
Issue: 4
Page: 1548-1561
Publish at: 2017-12-01

Clustering in Aggregated User Profiles Across Multiple Social Networks

10.11591/ijece.v7i6.pp3692-3699
Charu Virmani , Anuradha Pillai , Dimple Juneja
A social network is indeed an abstraction of related groups interacting amongst themselves to develop relationships. However, toanalyze any relationships and psychology behind it, clustering plays a vital role. Clustering enhances the predictability and discoveryof like mindedness amongst users. This article’s goal exploits the technique of Ensemble K-means clusters to extract the entities and their corresponding interestsas per the skills and location by aggregating user profiles across the multiple online social networks. The proposed ensemble clustering utilizes known K-means algorithm to improve results for the aggregated user profiles across multiple social networks. The approach produces an ensemble similarity measure and provides 70% better results than taking a fixed value of K or guessing a value of K while not altering the clustering method. This paper states that good ensembles clusters can be spawned to envisage the discoverability of a user for a particular interest.
Volume: 7
Issue: 6
Page: 3692-3699
Publish at: 2017-12-01

SCNN Based Electrical Characteristics of Solar Photovoltaic Cell Model

10.11591/ijece.v7i6.pp3198-3206
Bambang Purwahyudi , Kuspijani Kuspijani , Ahmadi Ahmadi
Solar photovoltaic (PV) cell is one of the renewable energy sources and a main component of PV power systems. The design of PV power systems requires accurately its electrical output characteristics. The electrical characteristics of solar PV cell consist of I-V and P-V characteristics. They depend on the parameters of PV cell such as short circuit current, open circuit voltage and maximum power. Solar PV cell model can be described through an equivalent circuit including a current source, a diode, a series resistor and a shunt resistor. In this paper, the development solar PV cell model is built by using self constructing neural network (SCNN) methods. This SCNN technique is used to improve the accuracy of the electrical characteristic of solar PV cell model. SCNN solar PV cell model have three inputs and two outputs. They are respectively solar radiation, temperature, series resistance, current and power. The effectiveness of SCNN technique is verified using simulation results based on different physical and environmental conditions. Simulations are conducted by the change of the solar irradiation, temperature and series resistance. Simulation results show SCNN model can yield the I-V and P-V characteristics according to the characteristics of solar PV cell.
Volume: 7
Issue: 6
Page: 3198-3206
Publish at: 2017-12-01

Fuzzy Region Merging using Fuzzy Similarity Measurement on Image Segmentation

10.11591/ijece.v7i6.pp3402-3410
Wawan Gunawan , Agus Zainal Arifin , Rarasmaya Indraswari , Dini Adni Navastara
Some image’s regions have unbalance information, such as blurred contour, shade, and uneven brightness. Those regions are called as ambiguous regions. Ambiguous region cause problem during region merging process in interactive image segmentation because that region has double information, both as object and background. We proposed a new region merging strategy using fuzzy similarity measurement for image segmentation. The proposed method has four steps; the first step is initial segmentation using mean-shift algorithm. The second step is giving markers manually to indicate the object and background region. The third step is determining the fuzzy region or ambiguous region in the images. The last step is fuzzy region merging using fuzzy similarity measurement. The experimental results demonstrated that the proposed method is able to segment natural images and dental panoramic images successfully with the average value of misclassification error (ME) 1.96% and 5.47%, respectively.
Volume: 7
Issue: 6
Page: 3402-3410
Publish at: 2017-12-01

Neuroendoscopy Adapter Module Development for Better Brain Tumor Image Visualization

10.11591/ijece.v7i6.pp3643-3654
Sunil L. Bangare , G. Pradeepini , Shrishailappa Tatyasaheb Patil
The issue of brain magnetic resonance image exploration together with classification receives a significant awareness in recent years. Indeed, various computer-aided-diagnosis solutions were suggested to support radiologist in decision-making. In this circumstance, adequate image classification is extremely required as it is the most common critical brain tumors which often develop from subdural hematoma cells, which might be common type in adults. In healthcare milieu, brain MRIs are intended for identification of tumor. In this regard, various computerized diagnosis systems were suggested to help medical professionals in clinical decision-making. As per recent problems, Neuroendoscopy is the gold standard intended for discovering brain tumors; nevertheless, typical Neuroendoscopy can certainly overlook ripped growths. Neuroendoscopy is a minimally-invasive surgical procedure in which the neurosurgeon removes the tumor through small holes in the skull or through the mouth or nose. Neuroendoscopy enables neurosurgeons to access areas of the brain that cannot be reached with traditional surgery to remove the tumor without cutting or harming other parts of the skull. We focused on finding out whether or not visual images of tumor ripped lesions ended up being much better by auto fluorescence image resolution as well as narrow-band image resolution graphic evaluation jointly with the latest neuroendoscopy technique. Also, within the last several years, pathology labs began to proceed in the direction of an entirely digital workflow, using the electronic slides currently being the key element of this technique. Besides lots of benefits regarding storage as well as exploring capabilities with the image information, among the benefits of electronic slides is that they can help the application of image analysis approaches which seek to develop quantitative attributes to assist pathologists in their work. However, systems also have some difficulties in execution and handling. Hence, such conventional method needs automation. We developed and employed to look for the targeted importance along with uncovering the best-focused graphic position by way of aliasing search method incorporated with new Neuroendoscopy Adapter Module (NAM) technique.
Volume: 7
Issue: 6
Page: 3643-3654
Publish at: 2017-12-01

High Torque Flux Switching Permanent Magnet Machine in Segmented Outer Rotor using Appropriate Split Ratio for Electric Scooter Propulsion

10.11591/ijpeds.v8.i4.pp1642-1649
Enwelum Mbadiwe I , Erwan Sulaiman , Ahmad Md Zarafi , Siti Khalidah Rahimi
Recently, permanent magnet synchronous machine (PMSM) having the diameter of 11inches was successfully developed and installed in electric scooter vehicle (ESV) for propulsion. It consists of segmented stators of 24 armature slots and 100 pieces of permanent magnet of 2 kg weight mounted on rotating rotor. Upon the huge amount of materials and permanent magnet used, PMSM produced 110Nm only. Looking at the size, this torque is low and could not sustain acceleration for long distance travels. To overcome the challenge of low torque, this paper presents a new machine type, flux switching motor (FSM) with 1 kg weight of permanent magnet flux source employing segmented outer rotor.  Six ranges of split ratio of 0.80-0.85 for outer rotor 24slot-14pole FSPM motor configurations were designed and compared. The 2D-FEA by JMAG software version 14 is used to examine its performance in term of flux linkage, cogging torque, back-emf and average torque which the structure with split ratio of 0.85 took lead by securing highest torque profile of 209Nm. It also achieved low cogging torque to operate in safe region. In conclusion, appropriate split ratio significantly enhances high torque capability of permanent magnet flux switching motor for electric scooter propulsion.
Volume: 8
Issue: 4
Page: 1642-1649
Publish at: 2017-12-01

CNR and BER Ranges for the DVB-T2 Reception-Success

10.11591/ijece.v7i6.pp3727-3734
Budi Setiyanto , Risanuri Hidayat , I Wayan Mustika , Sunarno Sunarno
DVB-T2 (Digital Video Broadcasting Terrestrial Second Generation) reception requires a sufficient quality of the received signal. CNR (carrier-to-noise ratio) and BER (bit-error-rate) are two of quantities describing the quality. This paper presents the range of each quantity providing a successful reception based on real data obtained by field-measurements. This data was collected from MO (mobile-outdoor) and SI (stationary-indoor) receiving-systems capturing signal sent by some on-air trial transmitters broadcasting services focused on the fixed-receivers. The result indicated that the successful and failed receptions were split into two quite separated (concentrated) ranges of post-decoded BER and therefore a boundary distinguishing them could be prominently defined. In contrast, they were spread in a wide common range of CNR and pre-decoded BER. Furthermore, the boundary that corresponded to this last quantity was ambiguous. In the case of MO reception as numerical examples, the two split ranges of post-decoded BER were less than about 10-5 and more than about 2.7 × 10-4 for the successful and failed receptions, respectively, whereas CNR as high as about 14 dB could be viewed as a soft boundary distinguishing these both reception-success conditions.
Volume: 7
Issue: 6
Page: 3727-3734
Publish at: 2017-12-01
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