• Journal of Digital Contents Society
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• v.18 no.1
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• pp.63-70
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• 2017

Recently, as user feedback such as social reading become active, demand has been increased on e-book contents making which is based on user feedback. However, to reflect the user feedback onto the e-book, direct coding is required, which was difficult to the author who was not good at programming. To resolve this problem, Block assembly style feedback editor system, using Blockly was developed. This editor enables to reflect the user feedback by area allocation, component allocation, block editing, and code generating insertion, contrary to the existing way of programming realization in which direct coding was required for input, processing and output separately. This system was developed by using HTML. Javascript, PHP, and Codeigniter. Block editing is enabled to do provision and assembly of blocks by Blockly. The function of code generation & insertion allows to insert the Library function code. Through this system, the general users who are not capable of coding also can reflect feedback without doing actual coding.

• Journal of Ubiquitous Convergence Technology
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• v.2 no.1
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• pp.12-17
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• 2008

In this paper, the 128bit AES block cipher algorithm OCB (Offset Code Book) mode for privacy and authenticity of high speed packet data was efficiently designed in C language level and was optimized to support the required capacity of contents server using high performance DSP. It is known that OCB mode is about two times faster than CBC-MAC mode. As an experimental result, the encryption / decryption speed of the implemented block cipher was 308Mbps, 311 Mbps respectively at 1GHz clock speed, which is 50% faster than a general design with 3.5% more memory usage.

• Journal of Korea Multimedia Society
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• v.20 no.2
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• pp.313-321
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• 2017

The emergence of E-book have allowed readers to interact with other readers and to actively participate (e.g. social reading). Furthermore, there is a growing demand in writer's community to take the advantage of the feedback from their readers to update the content of E-book. To do that, they require the service that utilizes the user feedback while creating or updating the e-book content. This study aims to let authors collect and to apply the reader's feedback on E-book content. However, in order to apply the user feedback, users first need to explicitly type the feedback, and even if they do, authors need to develop the software to automatically analyze and to apply the user feedback. This makes difficult for authors without programming background to produce E-book with automatic content adaptation. In this paper, we propose Feedback Clue Model to generate, analyze and apply the user feedback into E-book content. Based on this model, we develop the block editor which allows easy implementation of E-book that can be dynamically updated.

• Journal of architectural history
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• v.18 no.2
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• pp.27-45
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• 2009

This study was to analyze the philological character of Qingwujing(靑烏經). Qingwujing is the oldest and representative documents of FengShui, especially famous for FengShui XingQi(形氣) theories. In spite of is fame, a systematic research for Qingwujing was not yet fulfilled up to now in Korea. In is the main reason why have to research the philological character of Qingwujing. The results from this research were described as following. Qingwujing(靑烏經) as knows of Qingwujing's writer is very famous already in Han 한(漢) dynasty for his accurate FengShui methods. His FengShui thories getting more powerfyl from WeiChen(魏晉) to Tang(唐) dynasty. In Tang(唐) dynasty Qingwujing was abolished by government rulers, but it recovered and retouched by some scholars from Tang(唐) and Song(宋) dynasty. In the process, the block book of Qingwujing were changed for four or five kinds. Qingwujing's block books of Ming(明) dynasty are Yimenguangdu(夷門廣牘), Xiaoshisanjing(小十三經), Jujiabibei(居家必備), and Shuofu(說郛). It's block books of Qing(淸) dynasty are Gujintushujicheng(古今圖書集成), Sikuquanshu(四庫全書), Xuejintaoyuan(學津討原), and Ershierziquanji(二十二子全集). It's block book of Choson(朝鮮) dynasty is KyujangKak(奎章閣). Among them distinctive characters been founded, but the basic contents and theories are almost same. In Korea, Qingwuzi's FengShui theories were confirmed in Silla(新羅) dynasty, and it recoreded in Soongboksa inscription written by Choi-CheeWon. Qingwu(靑烏) or Qingwuzi were known for a great FengShui master of a FengShui standing theories in Koryeo(高麗) and Choson dynasty among royal families and the aristocratic classes. And Qingwujing was a representative FengShui theory book in wh0.1ole period of Choson dynasty. Now for understanding traditional FengShui theories, we have to understand the main FengShui theories on Choson dynasty at first. For understanding Choson FengShui, the study on philological character of Qingwujing is the basic works. If those works fulfilled successfully, we can understand FengShui theories and FengShu itself more correctly.

• Journal of the Korea Convergence Society
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• v.11 no.3
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• pp.27-35
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• 2020

The purpose of this study is to study the technical implementation methods to prevent problems such as the record of important educational activities of the student life record department or the continuous illegal leakage and manipulation. To this end, in this paper, by applying a private blockchain that can be participated only by a given organization or individual, it prevents outsiders from participating in the block network, and creates legitimate authority by creating two types of block data: student information block and access record block in the life record book. We proposed a block mechanism that can be registered, modified, and accessed only by authorized staff members. As a result, we have prepared an alternative to prevent forgery and alteration of the living records by third parties and to secure the integrity of the living records. If applied to the educational administrative information system, social consensus will be established that the operation and management of the life record book is reliable.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.358-360
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• 2020

본 연구보고서는 기부사용내역 불투명성 등으로 인해 감소 추세에 있는 기부금의 감소문제를 분석하고 이를 해결하기 위한 방안을 모색함. 연구의 목적은 Block Chain을 활용하여 기존의 기부시스템 개선 및 새로운 기부시스템 도입에 있음. 기부문화 활성화를 위해서는 기부금 사용에 대한 신뢰성 확보가 필수적. 따라서 기부금 사용내역을 투명하게 관리하는 시스템이 필요함. 이를 위해 블록체인을 기반으로 한 새로운 기부시스템 (New Donation System) 연구를 진행하였음. 새로운 기부시스템이 구축되기 위해서는 기부자, 기부단체, 정부가 서로 연계하여 블록체인을 기반으로 한 기부코인을 도입하고 이를 활용하는 금융 메커니즘의 적용이 필요함. 기부코인을 활용한 새로운 기부시스템이 도입된다면 우리나라의 기부시스템은 기존보다 진일보할 것이며 기부문화도 재활성화될 것으로 기대함.

• Korean Journal of Optics and Photonics
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• v.24 no.5
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• pp.262-270
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• 2013

In this paper, we propose a modified optical CBC(Cipher Block Chaining) encryption method using optical XOR logic operations. The proposed method is optically implemented by using dual encoding and a free-space interconnected optical logic gate technique in order to process XOR operations in parallel. Also, we suggest a CBC encryption/decryption optical module which can be fabricated with simple optical architecture. The proposed method makes it possible to encrypt and decrypt vast two-dimensional data very quickly due to the fast optical parallel processing property, and provides more security strength than the conventional electronic CBC algorithm because of the longer security key with the two-dimensional array. Computer simulations show that the proposed method is very effective in CBC encryption processing and can be applied to even ECB(Electronic Code Book) mode and CFB(Cipher Feedback Block) mode.

• 중국학논총
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• no.63
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• pp.1-28
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• 2019

This study set out to examine the variant forms in the Korean block-printed edition of YouYangZaZu(酉陽雜俎)n terms of modifications of writing forms, increase and decrease of strokes, shortening and lengthening of strokes, connection and interruption of strokes, replacement of Pyeonbang(偏旁), and changing structures and positions. The study also aims to investigate the frequent uses and characteristics of variant forms. The findings show that the variant forms of YouYangZaZu(酉陽雜俎) include characters in some parts. There are 1,500 variant forms in the Korean block-printed edition of YouYangZaZu(酉陽雜俎)ith numerous characters of both various modifications and increasing or decreasing strokes based on the same characters. There are mixed uses of block letters and variant forms throughout the book from a single form to ten different forms of a character.

• Journal of Software Assessment and Valuation
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• v.15 no.1
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• pp.115-121
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• 2019

I analyzed the structure of a block-chain system and a block-chain-based service system. It is a decentralized book encryption system software technology that does not require a third party to secure trust between the two parties. Block chains are structured in a linked list structure. The block chain manage transaction information by blocking the transaction information, in conjunction with other blocks. As a result, I have discovered structural weaknesses in current block-chain systems and block-chain-based service systems. Once these possible structural problems are resolved, I expect that the block-chain-based service system will make various industrial contributions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.5
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• pp.317-322
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• 2014

Data security and integrity is a critical issue in data transmission over wired/wireless links. A large amount of data is encrypted before transmission, by block cipher using mode of operation. RBF mode is a block cipher mode of operation which uses random characteristics. In this paper, we analyze the safety against known plaintext attack and chosen plaintext attack of RBF mode compared to the traditional modes. According to the analysis, RBF mode is known to be secure while the traditional modes are not secure against them.