• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.5
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• pp.912-919
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• 1994

A new error control line code based on an extended Hamming code is proposed and its performance is analyzed in this paper. The proposed code is capable of single error correction and double error detection since its minimum Hamming distance is 4. In addition, the error detection capability can be oncreased due to the redundancy bit used for line coding. As a result, the proposed code shows lower code rate, but better spectral characteristics in low frequency region and lower residual bit error rate than the conventional error correction line code using Hamming (7, 4) code.

• Journal of Industrial Technology
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• v.34
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• pp.33-37
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• 2014

The current companion animal registration system is based on implanting microchip into animal body. Thus, the maintenance cost is high, and it may cause dangerous effect on the animal health. Moreover, it is very inconvenient in utilizing the information. This paper presents a pet registration and information providing system based on QR code for low cost and convenience in field application. The owner can simply register pet information on the web server, print the QR code and attach it to the pet. Any person can scan the QR code by smart phone, identify the information, and call the owner directly.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.225-226
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• 2019

Code box 시스템은 프론트엔트 개발자를 위한 온라인 소스코드 저장소로 HTML. CSS, JavaScript를 작성하고 그 결과를 즉시 확인할 수 있으며, 소스코드의 버전관리 기능을 추가하여 소스코드의 변경에 따른 소스코드 관리 능력을 향상하도록 하였으며, 소스코드 작성 시 편의성을 향상시키기 위하여 코드 작성란에 문법자동완성과 Syntax Highlighting기능을 추가하였다. 또한 작성한 소스코드를 사용자들이 공유할 수 있으며 소스코드 작성 중 질문 사항이 발생하면 작성된 소스코드를 옮겨 실시간 질의 사항을 공유하도록 하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.12 no.4
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• pp.347-356
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• 1987

This paper is to propose a new line code suitable for a high speed unipolar pulse transmission system, such as a high speed optical digital transmission system. The original information speed can be converted into the transmission speed $\frac{(m+1)}{m}$ by the speed converter. Then this code, named mBiZ code, is generated by means of an Exclusive NOR between the bit stream inserted a space into every m bits and the bit stream delayed by the time slot allocated a single bit at the output coded sequence. Therefore, a mBiZ code can reduce a redundancy in the line code for transmission and its conversion circuits can be devised easily. The mBiZ code can also suppress undesirable long consecuitive identical digits and make line code balance in the mark and space ratio. Therefore, high frequency and low frequency components in power spectrum of a mBiZ code can be suppessed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.1A
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• pp.16-23
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• 2008

In this paper, we propose a new code grouping interference cancellation(IC) receiver for multirate wideband code division multiple access(WCDMA) system based on orthogonal variable spreading factor(OVSF) code. The users are assigned different lengths of OVSF codes as a spreading code according to their data rates and divide the active users having same representative code split into a group for effective cancellation. The code grouping IC receiver performs cancellation between the groups first and cancellation within group. This proposed IC receiver can cancel the interferences using desired user's code information and then desired signals are detected. The results show that the large improvement in performance can be attained by groupwise IC scheme and we can make the effective systems compare to conventional ones.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.15 no.9
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• pp.3221-3242
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• 2021

The purpose of the study is to examine the current study trend of 'QR code' and suggest a direction for the future study of big data analysis: (1) Background: study trend of 'QR code' and analysis of the text by subject field and year; (2) Methodology: data scraping and collection, EXCEL summary, and preprocess and big data analysis by R x 64 4.0.2 program package; (3) the findings: first, the trend showed a continuous increase in 'QR code' studies in general and the findings were applied in various fields. Second, the analysis of frequent keywords showed somewhat different results by subject field and year, but the overall results were similar. Third, the visualization of the frequent keywords also showed similar results as that of frequent keyword analysis; and (4) the conclusions: in general, 'QR code' studies are used in various fields, and the trend is likely to increase in the future as well. And the findings of this study are a reflection that 'QR code' is an aspect of our social and cultural phenomena, so that it is necessary to think that 'QR code' is a tool and an application of information. An expansion of the scope of the analysis is expected to show us more meaningful indications on 'QR code' study trends and development potential.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.279-282
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• 2002

Here we introduce so called Reference code-weighted sum of all PN codes used in the system-. We do inner product operation between received PN code and Reference code rather than locally generated PN code in the receiver. Acquisition process can be accomplished by only one inner product during full period of PN code. It's essential innovation against present method which can be viewed successive hypothesis test by inner product for entire candidate PH codes set. Well -defined decision region makes it possible. We suggest the. criterion fur designing the decision region and find a condition for weight (coefficient) of Reference code.

• Journal of the Korea Society of Computer and Information
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• v.6 no.4
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• pp.100-103
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• 2001

The best solution to improve the execution speed of Java program is to make use of the high speed JVM(Java Virtual Machine). The performance of JVM depends on the difference of its implementation. One of the technologies to enhance JVM performance is a JIT(Just-in-Time) code generator. The JIT code generator transforms Java byte code to the native machine code in accordance with computer system platform. The native machine code is faster than the existing interpreter method, since it can reduce the time to analyze the Java byte code. But the JIT code generator have the problem of increasing the traffic between stack and register because of using many register. Therefore, this paper suggests how to reduce the traffic by applying the policy of stack allocation to JIT code generation, as one of the methods to enhance the performance of JVM.

• Proceedings of the IEEK Conference
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• 2000.11c
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• pp.47-50
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• 2000

Recently many efforts on the development of automatic processing system for delivery sequence sorting have been performed in ETRI , which requires the use of postal 4-state bar code system to encode delivery points. The 4-state bar code called postal 4-state bar code for high speed processing that has been specifically designed for information processing of logistics and automatic processing of the mail items. This paper describes a method of Reed-Solomon encoding for creating error correction codeword of 4-state bar code.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.867-870
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• 2005

인터넷 및 전자상거래의 발전으로 인해 물류가 급증하고 있다. 물류 인수인계 문서 및 물류 정보의 전달 수단으로서 2 차원 바코드가 사용되는데 본 논문에서는 MaxiCode 에 대한 관심영역 추출 결과를 검증하는 방법을 제시하였다. 제안된 방법은 물류상에 바코드 영역 추출 방법에 의해 여러 종류의 바코드 중에서 MaxiCode 영역인지 검증하는 방법으로써 검증 후보 영역 설정, 후보 영역으로부터 중심점 획득, 중심점 검증 단계로 MaxiCode 의 영역 검증 방법을 제시한 것이다.