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An elliptical dipole antenna with rectangular slot reflector for wideband applications 一种宽带应用的矩形槽反射面椭圆偶极子天线
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947807
Amnat Sompan, S. Seewattanapon, C. Mahatthanajatuphat, P. Akkaraekthalin
{"title":"An elliptical dipole antenna with rectangular slot reflector for wideband applications","authors":"Amnat Sompan, S. Seewattanapon, C. Mahatthanajatuphat, P. Akkaraekthalin","doi":"10.1109/ECTICON.2011.5947807","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947807","url":null,"abstract":"This paper presents an elliptical dipole antenna with rectangular slot reflector for wideband applications. The proposed antenna is designed on the FR4 substrate, resulting in low profile, high gain, and low cost. The antenna composes of an elliptical dipole and a slot rectangular reflector on the same plane. The proposed antenna has been analyzed and simulated by using the CST software package. In order to confirm the results, implementation and measurement of the antenna have been realized. The measured S11 < −10 dB covering a frequency range from 3 to 12 GHz with a relative bandwidth of 123.07 % and the pattern bandwidth from 3 to 6.5 GHz have been obtained. Also, the main lobe gain of 5.3 dB has been found.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116977661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Categorial-grammar-based phrase break prediction 基于范畴语法的断句预测
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5948000
S. Saychum, C. Hansakunbuntheung, N. Thatphithakkul, T. Ruangrajitpakorn, C. Wutiwiwatchai, T. Supnithi, A. Chotimongkol, A. Thangthai
{"title":"Categorial-grammar-based phrase break prediction","authors":"S. Saychum, C. Hansakunbuntheung, N. Thatphithakkul, T. Ruangrajitpakorn, C. Wutiwiwatchai, T. Supnithi, A. Chotimongkol, A. Thangthai","doi":"10.1109/ECTICON.2011.5948000","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5948000","url":null,"abstract":"Part-of-speech (POS) has been widely used as the main feature for predicting phrase breaks in text-to-speech synthesis (TTS) systems. However, POS does not clearly represent syntactic information that is necessary for analyzing the grammatical tree structure of a language to assign phrase breaks. Instead of using POS, this paper proposes to use categorial grammar (CG), which embeds fine syntactic information, for Thai as a key feature to predict phrase breaks in Thai Texts. The performances of phrase break predictions using CG, POS, and their reduced sets are compared using classification and regression tree (CART) for learning and predicting phrase break locations. The experimental results showed that the phrase break prediction using CGs as the main feature gave the best performance among the tested features (Precision=73.15%, Recall = 96.96%, F-measure=83.39%).","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"28 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114118638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Modeling of a quadratic buck converter 二次降压变换器的建模
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947952
Ketsuda Karaket, C. Bunlaksananusorn
{"title":"Modeling of a quadratic buck converter","authors":"Ketsuda Karaket, C. Bunlaksananusorn","doi":"10.1109/ECTICON.2011.5947952","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947952","url":null,"abstract":"A quadratic buck converter, whose voltage conversion ratio equals square of a duty cycle, has good potential in DC-DC converter applications where a large voltage step-down is required, such as in modern automobile. This paper presents dynamic modeling of a quadratic buck converter with the State-Space averaging (SSA) technique. The SSA modeling leads to a small-signal linear dynamic model of the converter, from which the transfer functions used for feedback control design can be determined. Results are presented to verify accuracy of the obtained model.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114498158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
CMOS versatile precision rectifier using current conveyor 采用电流输送的CMOS通用精密整流器
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947775
U. Torteanchai, Kanok Sarasitthithum, M. Kumngern
{"title":"CMOS versatile precision rectifier using current conveyor","authors":"U. Torteanchai, Kanok Sarasitthithum, M. Kumngern","doi":"10.1109/ECTICON.2011.5947775","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947775","url":null,"abstract":"This paper presents a new versatile precision rectifier employing a current conveyor, current mirrors and diodes that performs as a positive half-wave, a negative half-wave, a positive full-wave and a negative full-wave rectifications into a single topology. The current-mode is employed for providing the high-precision capability of the circuit. The proposed configuration is very suitable for integrated circuit implementation in CMOS technology. The circuit exhibits a precise rectifier and good temperature stability. PSPICE simulation results using 0.5µm CMOS process demonstrate the performance of the proposed rectifier.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114555318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Multi-classification of business types on twitter based on topic model 基于主题模型的twitter商业类型多重分类
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947886
Chanattha Thongsuk, C. Haruechaiyasak, S. Saelee
{"title":"Multi-classification of business types on twitter based on topic model","authors":"Chanattha Thongsuk, C. Haruechaiyasak, S. Saelee","doi":"10.1109/ECTICON.2011.5947886","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947886","url":null,"abstract":"Today many businesses have adopted Twitter as a new marketing channel to promote their products and services. One of the potentially useful applications is to recommend users to follow businesses which match their interests. One possible solution is to apply classification algorithm to predict user's Twitter posts into some predefined business categories. Due to the short length characteristic, classifying Twitter posts is very difficult and challenging. In this paper, we propose a feature processing framework for constructing text categorization models. A topic model is constructed from a set of terms based on the Latent Dirichlet Allocation (LDA) algorithm. We apply the topic model for two different feature processing approaches: (1) feature transformation, i.e., using a set of topics as features and (2) feature expansion, i.e., appending a set of topics to a set of terms. Experimental results show that the highest accuracy of 95.7% is obtained with feature expansion technique, an improvement of 18.7% over the Bag of Words (BOW) model.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114593888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
DTMC analysis of connectedness for 2-dimension wireless relay placement with regular string topology 具有规则串拓扑的二维无线中继布置的DTMC连通性分析
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947857
Suwatchai Tangpaopong, T. Silawan, C. Aswakul
{"title":"DTMC analysis of connectedness for 2-dimension wireless relay placement with regular string topology","authors":"Suwatchai Tangpaopong, T. Silawan, C. Aswakul","doi":"10.1109/ECTICON.2011.5947857","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947857","url":null,"abstract":"This paper has proposed to analyse the probability of connectedness in a 1-dimension string of N relays being placed in a regular topology. The proposed technique is based on the transient behaviour of time-homogeneous discrete-time Markov chain. And the computational complexity is O(r2log2N), where r is the number of forwarding neighbors for each relay in the string. Further, in coping with realistic wireless relay placements spanning a geographical area, this paper has formulated the 2-dimension scenarios where the source station S, the destination station D and other stations are interconnected by independent relay strings. By using the inclusion-exclusion principle, the desired probability of S-D connectedness for 2-dimension case has been derived. Here, the resultant computational complexity is O(2m), where m is the total number of paths between S and D. Finally, by combining both 1-dimension and 2-dimension analyses, numerical results have been given to demonstrate the applicability of obtainable mathematical formula herein derived.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115242316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Irresponsible forwarding under general inter-vehicle spacing distributions 一般车辆间距分布下的不负责任转发
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947848
S. Panichpapiboon
{"title":"Irresponsible forwarding under general inter-vehicle spacing distributions","authors":"S. Panichpapiboon","doi":"10.1109/ECTICON.2011.5947848","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947848","url":null,"abstract":"Typically, vehicles in a self-organizing traffic information system distribute the information by rebroadcasting. Rebroadcasting results in redundant retransmission of the same information packet, leading to a useless occupation of the radio channel. Minimizing redundancy, while still guaranteeing complete reachability throughout the network, is a challenging task in multi-hop broadcasting. In our previous work, we introduced a new probabilistic-based broadcasting scheme, called Irresponsible Forwarding (IF), which could reduce the redundancy effectively. However, in the previous work, we only considered the scenario where the inter-vehicle spacing was exponentially distributed. In this paper, we generalize the concept of IF such that it can be applied to any inter-vehicle spacing distribution.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116297705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
A (t;w) threshold scheme over insecure channels 不安全通道上的A (t;w)阈值方案
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947815
Bhichate Chiewthanakul, Nattayanee Darath, Supawadee Wanapongtipakorn
{"title":"A (t;w) threshold scheme over insecure channels","authors":"Bhichate Chiewthanakul, Nattayanee Darath, Supawadee Wanapongtipakorn","doi":"10.1109/ECTICON.2011.5947815","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947815","url":null,"abstract":"Secret sharing schemes can be used to facilitate distributed trust or shared control for critical activities (e.g., signing corporate cheques; opening bank vaults), by gating the critical action on cooperation by t of w users. The disadvatages of these schemes are ineffective key management and in parties communication, the share secret keys must remain secret at both end. In this paper, we propose a method to exchange a Shamir's secret sharing over insecure channels to overcome these disadvantages. The algorithm complexity analysis shows that it is an efficient scheme in both space and time for constructing the share secret keys, recovering the message M from the threshold t of w people and encrypting the share secret keys. Since there is no efficient algorithm known of recovering pairs of share secret key (xi; yi) from corresponding ciphertext ci, given the public information (ni; ei) of each person. Therefore, this scheme can be achieved the high security through the insecure communication channels.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122028470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Feedback interference cancellation system for WCDMA radio repeater WCDMA中继器的反馈干扰消除系统
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947993
Akkarawut Thepworachai, C. Pirak
{"title":"Feedback interference cancellation system for WCDMA radio repeater","authors":"Akkarawut Thepworachai, C. Pirak","doi":"10.1109/ECTICON.2011.5947993","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947993","url":null,"abstract":"In this paper, a feedback interference cancellation system (FICS) is investigated in order to prevent the feedback signal from the transmit antenna coming into the received antenna when the repeater's gain is larger than the isolation between transmit and receive antennas of a radio repeater. Adaptive filters based on a least mean square (LMS) algorithm and a recursive least square (RLS) algorithm are also studied comparatively. The delay estimation algorithm based on a zero-padded autocorrelation technique is proposed. It can be shown that the proposed FICS achieves a lower error vector magnitude, especially for the RLS adaptive algorithm. In addition, the proposed delay estimation algorithm yields a highly accurate estimated delay of the first channel path. Furthermore, the proposed FICS does not need the feedback signal from the amplifier making the installation easier.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128198730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Wideband CPW-Fed aperture antenna by using a semicircle ring tuning stub 采用半圆环形调谐存根的宽带cpw馈电孔径天线
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947814
N. Tangthong, V. Pirajnanchai, N. Songthanapitak
{"title":"Wideband CPW-Fed aperture antenna by using a semicircle ring tuning stub","authors":"N. Tangthong, V. Pirajnanchai, N. Songthanapitak","doi":"10.1109/ECTICON.2011.5947814","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947814","url":null,"abstract":"This research paper presents a wideband CPW-Fed aperture antenna. The CPW-Fed is applied on planar semicircular ring tuning stub. The aperture antenna is printed on the same side of a FR4 dielectric substrate. The simulation is performed by using the IE3D program. The simulation results can be proved that bandwidth is within a range of 2.98 – 9.748 GHz. The measured impedance bandwidth is between 3.068 – 10.838 GHz which covers WLAN and WiMAX band. The measured results of resonant frequencies are coincident well with the simulated results. The proposed antenna performs small size, light weight and simple structure. The antenna is applied in wireless communication systems.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126057805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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