• Title/Summary/Keyword: 기재

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A Code Concealment Method using Java Reflection and Dynamic Loading in Android (안드로이드 환경에서 자바 리플렉션과 동적 로딩을 이용한 코드 은닉법)

  • Kim, Jiyun;Go, Namhyeon;Park, Yongsu
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.25 no.1
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    • pp.17-30
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    • 2015
  • Unlike existing widely used bytecode-centric Android application code obfuscation methodology, our scheme in this paper makes encrypted file i.e. DEX file self-extracted arbitrary Android application. And then suggests a method regarding making the loader app to execute encrypted file's code after saving the file in arbitrary folder. Encrypted DEX file in the loader app includes original code and some of Manifest information to conceal event treatment information. Loader app's Manifest has original app's Manifest information except included information at encrypted DEX. Using our scheme, an attacker can make malicious code including obfuscated code to avoid anti-virus software at first. Secondly, Software developer can make an application with hidden main algorithm to protect copyright using suggestion technology. We implement prototype in Android 4.4.2(Kitkat) and check obfuscation capacity of malicious code at VirusTotal to show effectiveness.

Dielectric characteristics of the transducer materials due to irradiation of photon beam (광자선 조사에 따른 변환기재료의 유전특성)

  • Ko, K.Y.;Kim, T.Y.;Back, G.M.;Cho, K.S.;Lee, C.H.;Lee, S.W.;Hong, J.W.
    • Proceedings of the KIEE Conference
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    • 2003.10a
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    • pp.316-318
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    • 2003
  • 본 연구에서는 전기적 특성, 기계적 특성, 내수성 및 내유성이 우수한 고분자 화합물로 산업용, 콘덴서절연재료용, 의료센서용 등 각종 절연재료 및 유전재료로 활용되어 지고 있는 변환기용 PET박막에 광자선을 10[Gy] 15[MeV], 30[Gy] 15[MeV], 50[Gy] 15[MeV]를 조사하여 물성분석 및 전기적 특성중 유전정접 특성에 관하여 검토하였다. 물성분석으로 X-선 회절(XRD) 분석 결과 조사량에 따라 피크의 크기가 커지므로 결정성이 더욱 좁아짐을 알수 있었으며 적외선 분광(FTIR) 측정결과로 파수 1752[$cm^{-1}$]에서는 C=O기의 신축운동 기여로 피크가 나타나며 파수 1266[$cm^{-1}$]에서 =C-O기의 신축운동기여와 그리고 1019[$cm^{-1}$]에서는 벤젠환의 진동기여로 흡수 피크가 나타남을 알 수 있었고, 전자현미경을 이용하여 800배로 확대한 시료의 파단면을 조사한 결과 결정질과 비정질 영역이 혼재하고 있는 것을 확인하였다. 유전정접 특성으로는 측정온도범위 상온에서 130[$^{\circ}C$]와 인가전압 범위 1[V]에서 20[V]를 변화시켜 각각의 조사량에 대한 PET 박막의 유전특성의 온도의존성 및 주파수 의존성에 대하여 실험한 결과 변환기 재료의 가능성을 조사하였다.

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Hydrodynamic Evaluation for Developing the New Inflatable Kayak (신형 인플래터블 카약 개발을 위한 유체역학적 성능평가)

  • Hah, Chong-Ku;Kim, Ho;Lim, Lee-Young;Ki, Jae-Suk
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.3
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    • pp.334-341
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    • 2015
  • This study is to evaluate hydrodynamic performance evaluation between three kinds of inflatable kayaks, that is, a frame kayak, a needle knife kayak, and a v-hull kayak. In order to test, inclining and turning trial test are performed in the Ocean Engineering Basin. Also, a resistance test is performed with a reduced scale kayak in the circulating water channel. Consequently, First, the moment arm of a v-hull kayak is the largest with 132.4mm, but turning radius of one was the smallest of them. Second, the resistance of a needle knife kayak is the smallest with 71N, the center of gravity of one was the lowest with 0.128m of them, and then needle knife kayak occurs in a draft overall. Consequently, the v-hull kayak has had the advantages on restoring force and turning performance than others. The needle knife kayak has been more excellent on resistance and center of gravity than others.

A Comparative Analysis of Classical Data in KCR 4 and CCR 2 (한국목록규칙과 중국문헌편목규칙의 고전자료 목록기술규칙 비교 분석)

  • Han, Mi-Kyung
    • Journal of the Korean Society for Library and Information Science
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    • v.47 no.3
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    • pp.275-293
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    • 2013
  • This study conducted comparative analysis of cataloging descriptions and rules in KCR 4 and CCR 2, as follows, for the purpose of seeking understanding of classical materials cataloging rules and networking of oriental historical data cataloging (bibliographical descriptions). First, to compare the general rules, the objects of descriptions and composition of descriptions, recording order, and punctuation and information source of descriptions were analyzed. As a result, KCR 4 is more detailed in terms of author role identifications and information source regulations and CCR2 is more detailed in terms of regulations related to printing and publications and serial publications. Second, to compare the details, the main titles and liability indications, edition details, publication details and format details, and note details. As a result, regarding the description of edition type and publication details, KCR4 has detailed regulations and CCR2 has characteristic summary in terms of note details.

High functional biodegradable card through annealing (어닐링을 통한 고기능성 생분해성 카드)

  • Sim, Jae-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.2
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    • pp.280-286
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    • 2020
  • Cards made from PVC and PET materials do not oxidize or decompose readily, so they are generally incinerated or landfilled after use and cause pollution problems, such as environmental hormones and combustion gases during incineration. In addition, there is a problem of environmental pollution because they are discarded as semi-permanent refuse without being decomposed at landfill. This study attempted to solve this problem using polylactic acid (PLA), which is a representative biodegradable material as a substitute material that can solve the issues with these cards. On the other hand, when the thin card core sheet is made from only PLA material, the physical properties of the material are insufficient, such as the low temperature impact strength, high temperature stability, and poor bending properties, so its use is limited. To solve this problem, the compositional ratio of PLA was reviewed, and the optimal biodegradable compound composition was determined through an examination of the compositions, such as crystallization nucleating agents, additives, and nano compound technology. The high functionalization as a biodegradable card was verified through a laminating process using annealing technology.

Meaning of 'Writing of Picture' in the Digital Era (디지털 시대 '사진쓰기'의 의미)

  • Kim, Ji-Young
    • The Journal of the Korea Contents Association
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    • v.12 no.4
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    • pp.156-163
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    • 2012
  • In 2011, in the Olympus advertisement appeared a copy of 'Writing of Picture'. Usually, the verb of 'Shoot' is commonly attached behind the picture, but a new sentence was made connecting 'writing' into the picture in the advertisement. With entrance of the digital era, the digital devices became popular, and the behaviors people post messages and pictures together on the internet site also became popular. Whether we first take a picture and then make a writing later, or whether we first make a writing and then take a picture later, the meaning of 'writing' and 'shooting' is actually alike in the digital era. People now use various images and writings, at the same time, of the pictures in expressing their own selves positively. This soon means not only that the pictures are helpful for writings, but also that the delivery of the meaning is not carried out only by characters. To the digital natives who have grown within many images, this atmosphere is a natural thing. In the field of Korean language education, the study of making use of the pictures and media for writings is in progress.

Measures for Enhancing System of Crime Victim's Information Protection (범죄피해자 정보보호법제의 개선방안에 대한 연구)

  • Lee, Kwon Cheol
    • The Journal of the Korea Contents Association
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    • v.16 no.10
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    • pp.175-187
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    • 2016
  • Protection of personal information has significant meaning in current information age. Information of crime victim is one of top in value in that divulgence of the information to perpetrators may threat safety of the victim or cause psychological demage as $2^{nd}$ harm if disclosed to public. Legal system protects the information with scattered statutes including Criminal Procedure Act. Existing studies have been limited to discussion of the single statute without integrated approach. Bearing necessity of the approach in mind, as issues of protection system this research proffers too broad subject of eligible inspection of case document, inactive practice of identity management cards and omission of personal information, and inappropriate punishment on the disclosure or divulgence. After reviewing systems of foreign jurisdictions to get useful implications, this paper suggests several measures with two separate aspect of legal provisions and protection practice.

A Study on Developing a Name Access Point Control System to Improve the Performance of Information Retrieval from Institutional Repositories (기관 리포지터리의 검색기능 향상을 위한 인명 접근점제어 시스템 구축 연구)

  • Kim, Mi-Hyang;Kim, Tae-Soo
    • Journal of the Korean Society for information Management
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    • v.27 no.3
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    • pp.125-146
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    • 2010
  • This study developed a name access point control system for better performance of information retrieval from institutional repositories, which are equipped with authorgenerated metadata processes for self-archiving. In developing name access point control data for the system, the primary data were created from the existing authority. However, unlike the existing authority data, the primary data did not use any authority forms. Instead, the data utilized all the forms provided by the resources as access points. Specifically, field of activity(subject) and title information on authorship were used to distinguish between persons who have the same name. The result showed that the system improved the performance of the information retrieval. The system has been also expected to be utilized over other metadata provided by libraries, in addition to the institutional repositories, in order to provide better quality information.

A study on the RSS-Based dissemination model to support the personalization of academic information (학회정보 개인화 지원을 위한 RSS기반 유통 모델 연구)

  • Kwon, Lee-Nam;Kim, Jae-Soo
    • Proceedings of the Korea Contents Association Conference
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    • 2004.11a
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    • pp.545-553
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    • 2004
  • A researcher, who is a member of an academic society, is required to write a report on his or her research and present it at an academic workshop in order to have the contents of the research recognized by others. In order to do that, the researcher frequently has to look up the web pages of each workshop for information such as the submission deadline, paper information, announcements and news. On the other hand, the academic society mostly relies on e-mail or bulletin board to send information about itself to its members to inform its members about its latest news or developments. A system where the researcher can gain all the information required through just a single click and the academic society can provide its members with the necessary information through a simple step is required for the ease of both side. We will take a look at the domestic status of researches being done on such systems where the RSS standard has been applied and suggest a RSS-based dissemination model where the concept of personalization has been applied to satisfy the needs of the individual user.

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Speech Rate and the Acoustic Features of Korean Segments (발화속도와 한국어 분절음의 음향학적 특성)

  • 이숙향;고현주
    • The Journal of the Acoustical Society of Korea
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    • v.23 no.2
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    • pp.162-172
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    • 2004
  • This study investigates the following three things through a production experiment and acoustic analysis: 1) relationship between speech rate and the segment duration in Korean, 2) relationship between speech rate and spectral characteristics of vowels, i. e. undershoot, and 3) correlation between the vowel duration and undershoot. The results showed that the faster the speech rate nab, the shorter the duration of syllables and segments was. A few speakers were affected by speech rate in the durational ratios between closure and aspiration in a stop and between Towel and consonant in a syllable. Closure duration and vowel duration were more affected compared to aspiration and consonant duration, respectively. Speakers showed some differences in the extent to which speech rate affected vowel undershoot, implying that speakers used different production mechanisms for spectral characteristics of vowels: Some speakers speeded up movement of articulatory organs according to speech rate increase while some kept it constant regardless of speech rate change.