International Conference & Workshop on Emerging Trends in Technology最新文献_第8页

Mitigating denial of service attack using CAPTCHA mechanism 使用CAPTCHA机制减轻拒绝服务攻击

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980086

Mahendra Mehra, Mayank Agarwal, R. Pawar, D. Shah

{"title":"Mitigating denial of service attack using CAPTCHA mechanism","authors":"Mahendra Mehra, Mayank Agarwal, R. Pawar, D. Shah","doi":"10.1145/1980022.1980086","DOIUrl":"https://doi.org/10.1145/1980022.1980086","url":null,"abstract":"Denial of Service (DoS henceforth) attack is performed solely with the intention to deny the legitimate users to access services. Since DoS attack is usually performed by means of bots, automated software. These bots send a large number of fake requests to the server which exceeds server buffer capacity which results in DoS attack. In this paper we propose an idea to prevent DoS attack on web-sites which ask for user credentials before it allows them to access resources. Our approach is based on CAPTCHA verification. We verify CAPTCHA submitted by user before allowing the access to credentials page. The CAPTCHA would consist of variety of patterns that would be distinct in nature and are randomly generated during each visit to the webpage. Most of the current web sites use a common methodology to generate all its CAPTCHAs. The bots usually take advantage of this approach since bots are able to decipher those CAPTCHAs. A set of distinct CAPTCHA patterns prevents bots to decipher it and consequently helps to reduce the generation of illicit traffic. This preserves the server bandwidth to allow the legitimate users to access the site.","PeriodicalId":197580,"journal":{"name":"International Conference & Workshop on Emerging Trends in Technology","volume":"122 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131913258","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: 31

A survey of handwritten document pre-processing techniques and customizing for Indic script 手写体文件预处理技术及印度文字定制研究

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980065

V. Hole, L. Ragha

{"title":"A survey of handwritten document pre-processing techniques and customizing for Indic script","authors":"V. Hole, L. Ragha","doi":"10.1145/1980022.1980065","DOIUrl":"https://doi.org/10.1145/1980022.1980065","url":null,"abstract":"Preprocessing of document image is a very important step to handle the deformations namely noise, different handwriting complexities that may result in base line skew, word skew, character skew, accents may be cited either above or below the text line and parts of neighboring text lines may be connected, etc. The paper proposes a novel preprocessing technique for handwritten document to handle some of the deformations usually present in the document like touching components, overlapping components, skewed lines, words with individual skews etc. and build a proper text image with all these deformations removed.\u0000 Based on the analysis of Indian script character shapes and literature survey, it proposes a new sequence of preprocessing methods. A binarized image is sub-sampled and connected components are extracted. These components are dilated and thinned and is given to Hough transform for both global skew and local skew detection for line extraction. The word segmentation is done with the computation of the distances of adjacent components in the text line image and classification of the previously computed distances as either inter-word gaps or inter-character gaps. The extracted words can be used for producing properly aligned text image or for text conversion using OCR.","PeriodicalId":197580,"journal":{"name":"International Conference & Workshop on Emerging Trends in Technology","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132248603","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

Precise positioning using gps for category-III aircraft operations using smoothed pseudorange measurements 使用gps对iii类飞机进行精确定位，使用平滑伪距测量

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980205

S. Agarwal, H. Hablani

{"title":"Precise positioning using gps for category-III aircraft operations using smoothed pseudorange measurements","authors":"S. Agarwal, H. Hablani","doi":"10.1145/1980022.1980205","DOIUrl":"https://doi.org/10.1145/1980022.1980205","url":null,"abstract":"Currently, standard single frequency Global Positioning System (GPS) receivers provide a positioning accuracy of approximately 4--20 m. This precision can be further enhanced with dual frequency receivers which are able to provide accuracy around 1--12 m. However, these errors are quite large when it comes to safety of life applications such as aircraft landings. Differential GPS (D-GPS) allows for precise positioning using information from reference stations on the ground. Carrier phase tracking is one such D-GPS approach which allows range determination with centimeter level accuracy. However, carrier phase measurements require estimation of unknown fixed integer ambiguities before the receiver can start determining its position. Using single difference smoothed pseudorange measurements the integer ambiguities can be estimated with reasonable accuracy. This methodology brings the position error down to centimeter level which can meet the Federal Aviation Authority (FAA) regulations for Category-III (CAT-III) precision approaches. This paper examines single differenced smoothed pseudorange measurements for integer ambiguity resolution for precise positioning using carrier phase tracking. Simulation of GPS receiver performance using this methodology has been carried out and demonstrates positioning with centimeter level accuracy for the approach phase of flight. Positioning errors are also compared for dual frequency and carrier phase tracking modes.","PeriodicalId":197580,"journal":{"name":"International Conference & Workshop on Emerging Trends in Technology","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130335922","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

Receiver based capacity enhancement with cross-layer design approach for IEEE 802.11 ad-hoc networks 基于接收机的IEEE 802.11 ad-hoc网络跨层容量增强设计方法

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980197

Satish Y. Ket, R. Awale

{"title":"Receiver based capacity enhancement with cross-layer design approach for IEEE 802.11 ad-hoc networks","authors":"Satish Y. Ket, R. Awale","doi":"10.1145/1980022.1980197","DOIUrl":"https://doi.org/10.1145/1980022.1980197","url":null,"abstract":"The performance of IEEE 802.11 with different network densities and protocol configurations is of interest, particularly in distributed coordination function (DCF) mode. A mathematical model for one hop network IEEE 802.11 protocol was introduced by Bianchi [2] to analytically derive the saturated throughput. Our ultimate goal is to enhance the capacity of Ad-hoc network closer to the analytical values of this model. As an attempt, we propose the Receiver Based Capacity Enhancement Algorithm using Cross-Layer Design Approach (RCECLD) by dynamically adapting the data rate. It uses Signal-to-Noise Ratio (SNR) values calculated by Physical layer and exported to Medium Access Control (MAC) layer via the cross-layer interface to estimate the prevailing channel state. In RCECLD the receiver decides the transmission data rate by calculating the SNR value of received RTS (Ready-to-Send), which is in turn an estimate of the prevailing channel state, and piggybacking it through CTS (Clear-to-Send) to the transmitter. Accordingly transmitter transmits the data frame with adopted data rate.\u0000 The capacity of the Ad-hoc network is enhanced with RCECLD. It is investigated through an extensive set of simulations. The results indicate that the enhancement is very close to analytical values for smaller network size and it is about 2.5 times more than Auto-Rate Fallback (ARF) [8], in spite of fading and mobility effects.","PeriodicalId":197580,"journal":{"name":"International Conference & Workshop on Emerging Trends in Technology","volume":"232 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113999780","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

An intelligent traffic control for MPEG video over Bluetooth using fuzzy controllers 基于模糊控制器的蓝牙MPEG视频智能流量控制

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980180

P. Thakare, S. Sawarkar

引用次数: 0

A novel and optimal video replication technique for video-on-demand systems 针对视频点播系统的一种新颖、优化的视频复制技术

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980098

A. Vinay, Abhinav Prakash, D. Kumar, K. Nagabhushan, T. Anitha

引用次数: 7

Network traffic monitoring using protocol analysis tool to achieve QoS 网络流量监控采用协议分析工具实现QoS

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980374

S. Bansode, V. Kaul, P. Nemade, M. Yadav, Swati Singh, Ashutosh Singh

{"title":"Network traffic monitoring using protocol analysis tool to achieve QoS","authors":"S. Bansode, V. Kaul, P. Nemade, M. Yadav, Swati Singh, Ashutosh Singh","doi":"10.1145/1980022.1980374","DOIUrl":"https://doi.org/10.1145/1980022.1980374","url":null,"abstract":"Communication networks are all about providing means to communicate that is for (exchanging the user information). The user information can be viewed as user traffic akin to the traffic on the road that moves across the road network. The fastest growth of data communication Networks over the past decades has resulted in the development of sophisticated tools to diagnose, debug and analyze such networks. We have developed a toolkit called MENeT (Monitor for Ethernet Network Traffic). The toolkit is an extension to the earlier developed utility for Traffic Monitoring. The toolkit is operational on the platform of windows NT/2000 and is developed by programming in Microsoft Visual C++ environment. The MENeT captures and dissembles the packets flowing through a system and extracts TCP/IP (Transmission Control Protocol/Internet Protocol) packets only. MENeT monitors network traffic by partitioning it into a set of classes. The set of classes are defined as Network Traffic, Broadcast Traffic and Workstation Traffic. It measures traffic at a time scale ranging from a few seconds to several minutes. Using the fine-grained information that MENeT exports, proves its effectiveness for monitoring and protocol analysis. The work on presenting the statistics to portray the Network Traffic from every angle is in place.","PeriodicalId":197580,"journal":{"name":"International Conference & Workshop on Emerging Trends in Technology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123500884","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

Wireless data assistance in real time environment using DSP processor 利用DSP处理器实现实时环境下的无线数据辅助

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980207

D. C. Shah, U. Dalal

{"title":"Wireless data assistance in real time environment using DSP processor","authors":"D. C. Shah, U. Dalal","doi":"10.1145/1980022.1980207","DOIUrl":"https://doi.org/10.1145/1980022.1980207","url":null,"abstract":"This paper presents a wireless solution for data acquisition working in real time environment using DSP processor TMS320F2812. The design presented gives multi edge benefits of signal processing besides employing wireless medium for remote transmission of acquired data in highly secured medium. Cypress made Radio Frequency transceiver CYWUSB6935 using Direct Sequence Spread Spectrum (DSSS) modulation interfaced with DSP processor using Serial Peripheral Interface (SPI). The design represents extended External Interface (XINTF) of the DSP processor by means of programming CPLD XCR3256. It is a solution for process industries where continuous monitoring of diverse process parameters fritter away many man power hours. The data is available to the monitoring computer on one press of button without laying long cables in maladroit industry environment. This leads towards automation and cost saving solution for industries. It can be modified to handle very low sampling rate creating database of long time as well as to the real time alarm generation system. The design can be enhanced for various applications like remote security system, RF counting of inventory, traffic monitoring system, weather control system and many more.","PeriodicalId":197580,"journal":{"name":"International Conference & Workshop on Emerging Trends in Technology","volume":"258 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123064688","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

Characterization of optically controlled ion implanted in1-gaxas MESFET with buried gate 埋栅光控离子注入1-气体MESFET的特性研究

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980264

B. K. Mishra, Lochan Jolly, S. C. Patil

引用次数: 0

Vector quantization using global codebook technique 矢量量化使用全局码本技术

International Conference & Workshop on Emerging Trends in Technology Pub Date : 2011-02-25 DOI: 10.1145/1980022.1980032

H. B. Kekre, T. Sarode, K. Raut, R. Tahiliani

引用次数: 0