Wireless Information Security and Eco Electronics Research Unit

Bangkok, Thailand

Wireless Information Security and Eco Electronics Research Unit

Bangkok, Thailand
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Kandwal A.,Wireless Information Security and Eco Electronics Research Unit
APCAP 2016 - 2016 IEEE 5th Asia-Pacific Conference on Antennas and Propagation, Conference Proceedings | Year: 2016

A compact multilayer broadband antenna with partial superstrate layer, EBG layer and reflector surface operating at 140 GHz has been proposed for millimeter wave applications. The antenna consisting of radiating patch elements has been designed on a very thin flexible substrate of thickness 0.110 mm. The upper layer material consists of removed periodic blocks in the superstrate dielectric. An EBG layer has been stacked above this partial superstrate with hexagonal shaped elements. This compact (2×2) mm2 antenna provides a peak gain of about 10 dB with ultralow side lobe levels of about-32 dB. The bandwidth for the operating frequency is about 15 GHz. The proposed antenna can be integrated with mm-wave circuits for range of applications such as automotive radars and sensing. © 2016 IEEE.


Khan S.,Asian Institute of Technology | Saengudomlert P.,Bangkok University | Taparugssanagorn A.,Wireless Information Security and Eco Electronics Research Unit
IEEE Region 10 Annual International Conference, Proceedings/TENCON | Year: 2015

TV White Space (TVWS) is becoming a useful communication medium through cognitive radio techniques. IEEE 802.22 Wireless Regional Area Network (WRAN) has been adopted as a standard in this regard. WRAN has a coverage radius of up to 30km. Due to large cells and opportunistic spectrum utilization, the self-coexistence situation, where multiple WRAN Base Stations (BSs) share the same spectrum band in the same region, is expected to be common. This paper explores the use of relay-based WRANs to improve the transmission performance under the self-coexistence situation; this performance improvement has not been reported to the best of our knowledge. In particular, we investigate the delay performance of multi-hop WRANs under the self-coexistence situation using simulations, and compare the performance to the case of single-hop WRANs without relay. We also evaluate the delay performance for hybrid scenarios where some of the Consumer Premise Equipments (CPEs) use relay while others communicate directly to BSs. Numerical results indicate that using relay transmissions for CPEs in the overlap area of self-coexisting WRANs can help decrease the average packet delay when the transmission resources become scarce. © 2014 IEEE.


Teerakanok S.,Prince of Songkla University | Vorakulpipat C.,Wireless Information Security and Eco Electronics Research Unit | Kamolphiwong S.,Prince of Songkla University | Siwamogsatham S.,Wireless Information Security and Eco Electronics Research Unit
ETRI Journal | Year: 2013

Protecting privacy is an important goal in designing location-based services. Service providers want to verify legitimate users and allow permitted users to enjoy their services. Users, however, want to preserve their privacy and prevent tracking. In this paper, a new framework providing users with more privacy and anonymity in both the authentication process and the querying process is proposed. Unlike the designs proposed in previous works, our framework benefits from a combination of three important techniques: k-anonymity, timed fuzzy logic, and a one-way hash function. Modifying and adapting these existing schemes provides us with a simpler, less complex, yet more mature solution. During authentication, the oneway hash function provides users with more privacy by using fingerprints of users' identities. To provide anonymous authentication, the concept of confidence level is adopted with timed fuzzy logic. Regarding location privacy, spatial k-anonymity prevents the users' locations from being tracked. The experiment results and analysis show that our framework can strengthen the protection of anonymity and privacy of users by incurring a minimal implementation cost and can improve functionality. © 2013 ETRI.


Lertwiriyaprapa T.,King Mongkut's University of Technology Bangkok | Fakkheow P.,Wireless Information Security and Eco Electronics Research Unit
Assistive Technology | Year: 2015

This research aims to develop a low-cost audio prescription labeling (APL) system for visually-impaired people by using the RFID system. The developed APL system includes the APL machine and APL software. The APL machine is for visually-impaired people while APL software allows caregivers to record all important information into the APL machine. The main objective of the development of the APL machine is to reduce costs and size by designing all of the electronic devices to fit into one print circuit board. Also, it is designed so that it is easy to use and can become an electronic aid for daily living. The developed APL software is based on Java and MySQL, both of which can operate on various operating platforms and are easy to develop as commercial software. The developed APL system was first evaluated by 5 experts. The APL system was also evaluated by 50 actual visually-impaired people (30 elders and 20 blind individuals) and 20 caregivers, pharmacists and nurses. After using the APL system, evaluations were carried out, and it can be concluded from the evaluation results that this proposed APL system can be effectively used for helping visually-impaired people in terms of self-medication. Copyright © 2015 RESNA.


Kandwal A.,Wireless Information Security and Eco Electronics Research Unit | Pongpaibool P.,Wireless Information Security and Eco Electronics Research Unit | Siwamogsatham S.,Wireless Information Security and Eco Electronics Research Unit
Microwave and Optical Technology Letters | Year: 2015

This article proposed a novel compact antenna design for K-band applications using electromagnetic band gap (EBG) structure. A very compact design has been fabricated on a Rogers Duroid 4350 substrate and is multilayered with another substrate of similar dimensions. The design consists of circular patch and circular rings both as active antenna elements and EBG structures. The proposed antenna resonates at a frequency of 18.72 GHz with a wide band of about 1 GHz and a gain of 8.1 dBi along with a reduced side lobe level of -11.6 dB. The electromagnetic band structure incorporated along with a multilayer structure resulted in enhancement of impedance bandwidth and improvement in radiation characteristics. © 2015 Wiley Periodicals, Inc.


Taparugssanagorn A.,Wireless Information Security and Eco Electronics Research Unit | Siwamogsatham S.,Wireless Information Security and Eco Electronics Research Unit | Pomalaza-Raez C.,Purdue University
Advances in Bioinformatics | Year: 2014

This paper proposes the use of ultrasonic microscale subarrayed MIMO RADARs to estimate the position of breast cancer nodes. The transmit and receive antenna arrays are divided into subarrays. In order to increase the signal diversity each subarray is assigned a different waveform from an orthogonal set. High-frequency ultrasonic transducers are used since a breast is considered to be a superficial structure. Closed form expressions for the optimal Neyman-Pearson detector are derived. The combination of the waveform diversity present in the subarrayed deployment and traditional phased-array RADAR techniques provides promising results. © 2014 Attaphongse Taparugssanagorn et al.


Sansanayuth T.,Thammasat University | Suksompong P.,Thammasat University | Chareonlarpnopparut C.,Thammasat University | Taparugssanagorn A.,Wireless Information Security and Eco Electronics Research Unit
13th International Symposium on Communications and Information Technologies: Communication and Information Technology for New Life Style Beyond the Cloud, ISCIT 2013 | Year: 2013

RFID localization uses Radio Frequency Identification (RFID) technology to determine object's position in a specific area. Location identification based on Dynamic Active RFID Calibration (LANDMARC) is a notable technique in which active tags and signal strengths are utilized. In this paper, Linear Minimum Mean Square Error (LMMSE) estimation is employed to improve the accuracy of LANDMARC. The type of tags is also changed to passive one which smaller and cheaper than active tags. The simulation and experimental results show significant improvement over the conventional LANDMARC approach. © 2013 IEEE.


Sanglerdsinlapachai N.,Thammasat University | Plangprasopchok A.,Wireless Information Security and Eco Electronics Research Unit | Nantajeewarawat E.,Thammasat University
2014 International Computer Science and Engineering Conference, ICSEC 2014 | Year: 2014

Sentiment analysis is an interesting application in natural language processing, aiming at identifying emotional expressions attached to speeches or texts. In this paper, simple yet effective strategies to extract feature-based segments and combine sentiment scores were studied. The strategies exploit textual structures to improve the segmentation quality. Each relevant set of segmented texts is subsequently passed to a lexical-based sentiment classification to obtain the polarity of a product feature. By using textual structures, the proposed strategies can improve accuracy of the sentiment classification. Especially, the accuracy on feature reviews with negation terms is improved by 86.4%. Moreover, for positive feature reviews, the strategies perform reasonably well up to 0.765 on average, in terms of m-measure. © 2014 IEEE.


Taparugssanagorn A.,Wireless Information Security and Eco Electronics Research Unit | Siwamogsatham S.,Wireless Information Security and Eco Electronics Research Unit | Pomalaza-Raez C.,Purdue University
Proceedings - International Computer Software and Applications Conference | Year: 2013

In this paper we propose a positioning approach based on the time different of arrival (TDOA) algorithm from light emitting diodes to localize mobile targets in indoor environments. The hexagonal lattice alignment of LED transmitters is proposed to reduce the coverage holes and the areas of overlapping radiation. The accuracy of the position estimation is compared to the one in a typical rectangular grid alignment. In addition, an extended Kalman filter is adopted together with the TDOA method to enhance the position estimation performance. © 2013 IEEE.


PubMed | Wireless Information Security and Eco Electronics Research Unit and Purdue University
Type: | Journal: Advances in bioinformatics | Year: 2014

This paper proposes the use of ultrasonic microscale subarrayed MIMO RADARs to estimate the position of breast cancer nodes. The transmit and receive antenna arrays are divided into subarrays. In order to increase the signal diversity each subarray is assigned a different waveform from an orthogonal set. High-frequency ultrasonic transducers are used since a breast is considered to be a superficial structure. Closed form expressions for the optimal Neyman-Pearson detector are derived. The combination of the waveform diversity present in the subarrayed deployment and traditional phased-array RADAR techniques provides promising results.

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