• Journal of the Institute of Electronics Engineers of Korea CI
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• v.44 no.6
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• pp.51-61
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• 2007

In this paper, Air-interface protocols of ISO 18000-6 Types and EPCglobal Classes applied to RFID system in UHF band are analyzed, and those anticollision algorithms are realized. Also, the each algorithm which improves the performance of standard protocol is proposed, and the performance is compared when clock period of link timing is a identical condition on $12.5{\mu}s$. As the result, when 500 tags exist simultaneously inside reader interrogation zone, the tag recognition performance of a standard protocol is better in preceding order of Class-1 Generation-1, Type B, Type A, Class-0 and Class-1 Generation-2. And also the performance of improved protocol is better in ascending order of Type B, Type A, Class-1 Generation-1, Class-0 and Class-1 Generation-2. Therefore, performance of tag recognition remarkably depends on the regulated clock period in the protocol and link timing between a reader and a tag.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.226-231
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• 2011

This research was done to prove the optimal position to detect a train reader when using a multiple fusion sensor. The experiment was done using four Train installed RFID Readers located on the train. These readers were read by sensors installed at intervals of 50 meters on the up and down sections of the Line 8, from Amsa station to Moran station. We analyze errors in the recognition range according to the Tag's number of recognition due to RFID of train speed, and propose a method of estimation for an accurate estimation of the position of train At this the Least-Squares Method is applied to judge the position of train accurately from the error because of Tag's number of recognition and RFID of train speed. also It is verified through simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.6C
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• pp.626-633
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• 2009

ISO/IEC/WD 24753 defines new modem specifications for a long-range RFID communications and application protocol for a sensor tag system. According to the standard, the frequency offset of the tag is 4%. In general wireless communications systems, it is known that a coherent receiver is superior to a non-coherent receiver. However, if the frequency offset is large, it is difficult to restore the original data accurately with a coherent receiver, and the performance of a coherent receiver is easily degraded. In this paper, a non-coherent receiver structure is adopted to solve the frequency offset problem of long-range RFID communications. We designed a frequency estimation block to find an optimal frequency from the received signal with 4% frequency offset and proposed a start frame delimiter (SFD) detection algorithm to determine the start position of the payload. The frequency estimation block finds the optimal frequency from the received signal using 9-correlators. And the SFD detection block searches the received signal to find the start position of the payload with dual correlator. We implemented a long-range RFID reader with the proposed methods and evaluated its performance in a wired/wireless test network. The implemented long-range RFID reader showed more superior performance than the commercial RFID reader in terms of recognition range.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.1B
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• pp.78-84
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• 2010

A fixed 900 MHz near field RFID system is developed to provide information; market efficiency, jewelry information and the circulation history information in real time, to the customers. The developed RFID system for the jewelry management consists of a reader, antenna and a CPU in a integrated type. The system size is $38\;{\times}\;25\;{\times}\;19\;cm^3$, the operated frequency band of the reader antenna is 905 ~ 926 MHz. The maximum gain of the embedded reader antenna is 5.1 dBii(@ 910 MHz). Honeycomb tag manufactured by RSI Co. is suitable for the jewelry management than another other commercial near field tags. The tagging method and the tagging location of Honeycomb tag are suggested. In the suggested system, the maximum reading range is about 16 cm, and the zone with 100 % recognition rate is 10 cm from the radom of the reader antenna.

• Journal of agricultural medicine and community health
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• v.25 no.2
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• pp.379-395
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• 2000

This questionnaire survey was conducted to evaluate the impact of health newsletter and related factors in the rural area. The Subjects were 354 individuals of 45 years of age and over, living in Chonnam province. The results of this study were as follows: The 225 surveyed persons (64%) recognized the health newsletter, and 196 persons (55%) read it least once and more. Newsletter-recogniton related factors were sex and age. Newsletter-reading related factors were chronic disease and sex. And Newsletter-reading pattern was determined by age and education level. 147 persons(75.8%) reported that they had got the important health information from newletter, and 76 persons(39.8%) reported the behavior change. The quiz scores of hypertension and health care in summer were higher in the persons of newsletter-recognition than in persons of non-recognition. The quiz score of hypertension was not higher in newsletter reader than non-reader, but that of health care in summer was higher in newsletter reader than in non-reader.

• Cartoon and Animation Studies
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• s.35
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• pp.227-253
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• 2014

The purpose of this article is to prove the fun of cartoon has related in Reality. Ultimately, it will be occurred the expanding result in contact with reader's reality perception. I had pointed out this issue in introduction. Although Fun is our vital power, almost people recognize it as imagination result which is not related in Reality. As the result, we overlooked Fun is contacted in Reality recognition. Creation method of cartoon story emphasize "the Individual character" and "the original nature" also. As this result, it has limitation which neglect "Reality". In main subject, I explained the meaning of Fun and Reality in feeling Korea Cartoon. First, we looked around a theoretical background of fun. With take surveying for various fun characters in several category of cartoon. We can confirm that it was occurred the results contacting "Enlargement of actual recognition" commonly. Second, the main issue of Korea cartoon was "Reality" historically. But, described Reality in cartoon is different from true Reality. Therefore, cartoon is imagined Reality of writer. So he make a heros and make a fun putting a folk tail. Third, described Reality in Korea cartoons make a fun and reader's consensus which is from emotional reality. With limitation of writer's "Reality recognition", almost writers adapted to ideology of ruling classes. Forth, we surveyed Korean cartoons which described "true Reality". Newspaper cartoons during imperialism and Min-joong cartoon in 80' period and 2000th period life documentary cartoon, we participated three sector and surveyed each character. Especially, I am dealing with important inconsistency of true reality. As this result, My cartoon enlarge reader's true reality and make "Fun" of recognizing a true reality.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.544-546
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• 2001

이 논문은 OCR(Optical Character Reader)로 인식된 한글 문서에서의 오인식 경향을 분석하고, 이를 이용한 한글 단어 검색 방법을 제안한다. OCR로 인식된 많은 야의 한글 문서를 기반으로 자모별 인식 빈도수를 계산하고 이를 바탕으로 초성, 중성, 중성별 인식 혼동 행렬(confusion matrix)을 구성하였다. 또한 인식 정보를 적절히 이용하기 Bayes 정리를 이용하였다. 질의어에 대한 오인식 단어의 검색 방법을 제시하고 혼동 행렬과 이 검색 방법을 바탕으로 OCR 기반 단어 검색 시스템을 구축하였다.

• Journal of Korea Society of Digital Industry and Information Management
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• v.7 no.3
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• pp.85-95
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• 2011

Smart phones, greatly expanding in the recent mobile market, are equipped with various features compared to existing feature phones and provide the conveniences to in several ways. The camera, one of the features of a smartphone, creates the digital contents, such photos and videos, and plays a role for the media which transmits information, such as video calls and bar code reader. QR-Code recognition is also one of the camera features. It contains a variety of information in two-dimensional bar code type in matrix format, and makes it possible to obtain the information by using smart phones. This paper analyzes the method of QR-Code recognition, password method-the existing user-authentication technique, smart card, biometrics and voice recognition and so on and thenn designs a new user-authentication technique. The proposed user-authentication technique is the technique in which QR-Code, which can be simply granted is read by smart phones and transmitted to a server, for authentication. It has the advantages in view that it will simply the process of authentication and conteract the disadvantages, such as brute force attack, man-inthe-middle attack, and keyboard hacking, which may occur in other authentication techniques.

• Korean Journal of Child Studies
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• v.29 no.5
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• pp.301-319
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• 2008

This study investigated the effectiveness of reading intervention on at-risk readers from first through third grade. The 34 children below the 20th percentile on an oral reading fluency test participated in the reading intervention program for 15 weeks. They received small group instruction in one 40-minute session per week. Data were analyzed with one-way ANOVA, paired t-test and effect size for individual cases. Upon completion of the intervention, at-risk first graders showed significantly higher performance in print concept, word recognition, oral reading fluency and reading comprehension. The at-risk second and third graders improved only in oral reading fluency. Most of children who received the intervention demonstrated a large effect in oral reading fluency.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.29B no.2
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• pp.50-59
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• 1992

In the most studies of Korean character recognition so far, they first classify the characters to 6 types according to their structures and then recognize the characters by identifying their basic components named $'$jaso.$'$ In the study, we propose a method which recognizes the characters without using structure types and is applied to reading documents containing both Korean and Chinese characters. We first classify Korean and Chinese characters by using a modified SOFM model. Then we recognize the characters in each class by using an APC neural network which has the advantage of fast leaning speed and the capablity of additive learning. An experimental result demonstrated the usefulness of the approach with the recognition rate of $\%.$\%.