• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.479-481
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• 2014

개인정보보호법의 개정안이 1년간의 계도 기간을 거쳐 2014년 8월 7일에 시행되었다. 개인정보 보호법은 개인정보보호에 관한 법률이 포함하고 있으며 크게 관리적인 보호조치와 기술적 보호 조치로 구분된다. 본 시스템은 기술적인 보호조치에 해당하며, 개인정보가 포함된 문서를 탐지 및 암 복호화 한다. 개인 정보를 보호하는 방법에 있어서 개인정보에 해당하는 패턴을 정의하고, 상기 패턴을 참조하여 컴퓨터에 저장된 파일에 개인정보가 포함되어 있는가를 검색하며, 정보보호를 위한 암 복호화 동작을 수행하는 정보보호단계를 제공함으로써, 개인정보가 포함되어 있는 파일의 외부 유출을 차단할 수 있을 것으로 기대된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.1667-1670
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• 2004

x86기반 임베디드 리눅스 시스템의 저장장치로 단일-칩 플래시 디스크인 DOC(DiskOnChip) 시스템이 많이 사용되고 있다. 본 연구에서는 DOC 스스로 부팅하도록 부팅이미지, 커널이미지, 루트파일시스템을 설치하는 과정을 설명한다. DOC는 자체 기능으로 에러탐색 및 수정기능과 파일시스템으로 TrueFFS가 인터페이스로 동작한다. 또한, 구성된 DOC 저장 시스템에 GUI 구현할 수 있도록 Qt-E 계층을 추가하여 시스템 개발자는 단지 어플리케이션을 설치함으로써 쉽게 임베디드시스템을 구성할 수 있다.

• Journal of KIISE:Software and Applications
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• v.30 no.1_2
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• pp.73-80
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• 2003

The Java programming language is designed for developing effective applications in a heterogeneous network environment. Major problem in Java is its performance. many attractive features of Java make the development of software easy, but also make it expensive to support ; applications written in Java are often much slower than their counterparts written in C or C++. To use Java`s attractive features without the performance penalty, sophisticated optimizations and runtime systems are required. Optimising Java bytecode has several advantages. First, the bytecode is independent of any compiler that is used to generate it. Second, the bytecode optimization can be performed as a pre=pass to Just-In-Time(JIT) compilation. Many attractive features of Java make the development of software easy, but also make it expensive to support. The goal of this work is to develop automatic construction of code optimizer for Java bytecode. We`ve designed and implemented a Bytecode Optimizer that performs the peephole optimization, bytecode-specific optimization, and method-inlining techniques. Using the Classfile optimizer, we see up to 9% improvement in speed and about 20% size reduction in Java class files, when compared to average code using the interpreter alone.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.5_6
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• pp.268-278
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• 2004

In this paper, we describe our experience in the design and implementation of the SMART file system to handle multimedia workload. Our work has three design objectives: (ⅰ) efficient support for sequential workload, (ⅱ) avoiding disk fragmentation, (ⅲ) logical unit based file access. To achieve these three objectives, we develop a file system where a file consists of linked list of Data Unit Group. Instead of tree like structure of the legacy Unix file system, we use single level file structure. Our file system can also access the file based upon the logical unit which can be video frame or audio samples. Data Unit Group is a group of logical data units which is allocated continuous disk blocks. At the beginning of each Data Unit Group, there exists an index array. Each index points to the beginning of logical data units, e.g. frames in the Data Unit Group. This index array enables the random access and sequencial access of semantic data units. SMART file system is elaborately tailored to effectively support multimedia workload. We perform physical experiments and compare the performance of SMART file system with EXT2 file system and SGI XFS file system. In this experiment, SMART file system exhibits superior performance under streaming workload.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.1
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• pp.31-42
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• 2017

Thumbnail, the small sized graphic file such as JPEG or GIF, serves to help the users to be recognized as a rapidly helps to make it easier recognize while browsing the large sized graphic file. Gallery application, which is installed in a later version of the 4.4.x(Kitkat) Android smartphone records the generated time of graphic file in thumbnail metadata. Thumbnail can be used to draw up the timeline of user action about user's action such as creation, modification, deletion with original graphic file analysis. Also, take advantage of the features thumbnails are stored sequentially in a single thumbcache file, even if the thumbcache is deleted, we can restore the thumbnails. This paper illustrates the feature of thumbnail created by Android OS basic gallery app and methods for utilization in digital forensics.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.9
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• pp.527-535
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• 2004

Handling mixed workload in digital set-top box or streaming server becomes an important issue as integrated file system gets momentum as the choice for the next generation file system. The next generation file system is required to handle real-time audio/video playback while being able to handle text requests such as web page, image file, etc. Legacy file system provides only best effort I/O service and thus cannot properly support the QoS of soft real-time I/O. In this paper, we would like to present our experience in developing the file system which fan guarantee the QoS of multimedia stream. We classify all application I/O requests into two category: periodic I/O and sporadic I/O. The QoS requirement of multimedia stream could be guaranteed by giving a higher priority to periodic requests than sporadic requests. The proto-type file system(Qosfs) is developed on Linux Operating System.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.01a
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• pp.209-212
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• 2017

최근 정보통신기술의 비약적 발전에 따라 문서 제작 과정 또한 디지털 방식의 형태가 주를 이루게 되었다. 하지만 이와 더불어 문서를 통한 개인 정보 유출의 문제 또한 대두되게 되었다. 본 논문에서는 이미지 형식의 문서의 유출 방지를 위해 광학문자인식(OCR)을 활용한 문자인식 기능과 개인정보 검출 기능을 통합적으로 수행 한하여 기존 OCR엔진과의 차별점을 두었다. 또한 원하는 경로의 파일 탐색을 가능하도록 하고, 선택한 경로에 저장되어 있는 이미지파일 내의 검출 문자들을 정규표현식을 사용해 특정한 개인정보 패턴과 매칭하여 문서 내 포함된 개인정보를 반환하여 출력한다. 이러한 개인정보 검출 결과 중요 개인정보가 포함된 파일을 사용자에게 별도로 통보하도록 한다. 따라서 본 논문에서는 기존의 개인정보 검출 과정의 번거로움을 극복하여 사용자의 편의 향상과 더불어 문서를 통한 개인정보의 유출을 사전에 방지 할 수 있도록 하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.322-325
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• 2017

Due to the rapid increase in data, various studies are being conducted to efficiently manage the data. In 2025, the total amount of data will increase to more than 163 ZB, and more than a quarter of the data will be a real-time data. As mass storage devices is changed from HDD to SSD, SSD needs own way to manage their data effectively. In this paper, we study the SSD system structure and deduplication management methods of data management related to Flash-SSD. We also propose an application level user file system using deduplication. It is anticipated that it saves storage capacity and minimize reducing performance by unnecessary traffic.

• Journal of Korean Library and Information Science Society
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• v.34 no.1
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• pp.91-109
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• 2003

One of the main issues in developing a digital library is how to implement an open digital library which can be interoperable, and diverse concepts, technology and protocols have been introduced to deal with this issue. In this study, it is analysed in terms of 'metadata interoperability', and based on the analysis, 5 basic component technologies are defined as follows: application profiles, modeling, implementation, resource discovery, portal service. Therefore it explains concepts of those core features, characteristics, cases in point, standardization and technical trends.

• Journal of Korea Society of Industrial Information Systems
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• v.8 no.3
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• pp.69-75
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• 2003

NAPRT(Naming Authority Pointer) is a type of resource record specified in IETF RFC 2915. NAPTR enables to register various services in the Domain Name Systems and thus provides a way to discover services available on specific hosts. This paper describes the design and implementation of a Proxy DNS system aimed at supporting NAPTRs. The goal of this work is to study on the feasibility of the service discovery registered in DNS via NAPTR records and provides the result for simplicity and extensibility of implementation through the implementation of a actual Test-bed system This research result can be applied to service discovery in the resource information management for high performance GRE environments as well as to the implementation of DNS infrastructure for the ENUM.