• 제목/요약/키워드: repacking

검색결과 7건 처리시간 0.021초

Effect of the Oxide Glass on the Metal Sintering Behavior in Silver Thick-Film System

  • ;김호기
    • 한국세라믹학회:학술대회논문집
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    • 한국세라믹학회 1986년도 Priceedings Of The Third Korea-Japan Seminar On New Ceramics
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    • pp.259-267
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    • 1986
  • The sintering behavior of silver-oxide glass composite thick-film has been studied with varing glass content. It is shown that during heat treatment glass became liquid phase to deeply affect the microstructure development of the silver particles and to control the physical properties of the thick-films. As glass content increased, the initial repacking of silver particles took place rapidly but the homogeneities of the microstructure showed different features. When the glass content was over some range, the silver particles exuded glass to decrease net energy and glass formed liquid pools separated from the solid skeletons. Finally the relations between the microstructures and electrical properties of the thick-film were discussed.

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Mutation Effects on FAS1 Domain 4 Related to Protein Aggregation by Molecular Dynamics Simulations and Solvation Free Energy Analysis

  • Cho, Sunhee;Ham, Sihyun
    • EDISON SW 활용 경진대회 논문집
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    • 제4회(2015년)
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    • pp.70-75
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    • 2015
  • Fasciclin 1 (FAS1) is an extracellular protein whose aggregation in cornea leads to visual impairment. While a number of FAS1 mutants have been studied that exhibit enhanced/decreased aggregation propensity, no structural information has been provided so far that is associated with distinct aggregation potential. In this study, we have investigated the structural and thermodynamic characteristics of the wild-type FAS1 and its two mutants, R555Q and R555W, by using molecular dynamics simulations and three-dimensional reference interaction site model (3D-RISM) theory. We find that the hydrophobic solvent accessible surface area increases due to hydrophobic core repacking in the C-terminus caused by the mutation. We also find that the solvation free energy of the mutants increases due to the enhanced non-native H-bonding. These structural and thermodynamic changes upon mutation contribute to understand the aggregation of these mutants.

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안드로이드 동적 클래스 로딩 기법을 이용한 개발단계에서의 보안약점 및 시큐어 코딩 연구 (Research on Secure Coding and Weakness for Implementation of Android-based Dynamic Class Loading)

  • 김현조;최진영
    • 한국멀티미디어학회논문지
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    • 제19권10호
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    • pp.1792-1807
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    • 2016
  • Android application is vulnerable to reverse engineering attack. And by this, it is easy to extract significant module from source code and repackage it. To prevent this problem, dynamic class loading technique, which is able to exclude running code from distributed source code and is able to load running code dynamically during runtime can be used. Recently, this technique was adapted on variety of fields and applications like updating pre-loaded android application, preventing from repacking malicious application, etc. Despite the fact that this technique is used on variety of fields and applications, there is fundamental lack on the study of potential weakness or related secure coding. This paper would deal with potential weaknesses during the implementation of dynamic class loading technique with analysing related international/domestic standard of weaknesses and suggest a secure way for the implementation of dynamic class loading technique. Finally, we believe that this technique described here could increase the level of trust by decreasing the weakness related to dynamic class loading technique.

Implications of Incentive Auction : Focusing on key issues in U.S.

  • Kim, Joohyun;Kim, Sang-Yong;Yeo, Jaehyun
    • 한국통신학회논문지
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    • 제39C권12호
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    • pp.1352-1361
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    • 2014
  • The Federal Communications Commission (FCC), which regulates interstate and international communications in the United States, has established a plan to allocate high demand spectrum to the usage of mobile communication by inducing voluntary relinquishment from broadcasters. This plan was introduced by the National Broadband Plan as an incentive auction in 2010. The FCC suggested the Notice of Proposed Rulemaking (NPRM) in 2012 and issued Report and Order (R&O) on May 2014 regarding the overall rules of incentive auctions expected to be implemented in mid-2015. The incentive auction attracts the attention of many countries because this policy suggests a novel approach regarding the alteration of use from an inefficient usage to an efficient usage in limited spectrum resources. In this paper, we define the key issues in order for implementation of incentive auction. Since the incentive auction is a highly complicated process compared to previous allocation procedures, a careful review of the incentive auction regarding whether this spectrum policy can be introduced is required. In this paper, we describe the detailed procedure of the incentive auction and present policy considerations for the introduction of the incentive auction.

A Novel Technique for Detection of Repacked Android Application Using Constant Key Point Selection Based Hashing and Limited Binary Pattern Texture Feature Extraction

  • MA Rahim Khan;Manoj Kumar Jain
    • International Journal of Computer Science & Network Security
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    • 제23권9호
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    • pp.141-149
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    • 2023
  • Repacked mobile apps constitute about 78% of all malware of Android, and it greatly affects the technical ecosystem of Android. Although many methods exist for repacked app detection, most of them suffer from performance issues. In this manuscript, a novel method using the Constant Key Point Selection and Limited Binary Pattern (CKPS: LBP) Feature extraction-based Hashing is proposed for the identification of repacked android applications through the visual similarity, which is a notable feature of repacked applications. The results from the experiment prove that the proposed method can effectively detect the apps that are similar visually even that are even under the double fold content manipulations. From the experimental analysis, it proved that the proposed CKPS: LBP method has a better efficiency of detecting 1354 similar applications from a repository of 95124 applications and also the computational time was 0.91 seconds within which a user could get the decision of whether the app repacked. The overall efficiency of the proposed algorithm is 41% greater than the average of other methods, and the time complexity is found to have been reduced by 31%. The collision probability of the Hashes was 41% better than the average value of the other state of the art methods.

오존수 산화를 이용한 활성탄 흡착탑의 현장 재생 시 흡착용량 및 구조특성의 변화 (Changes of Adsorption Capacity and Structural Properties during in situ Regeneration of Activated Carbon Bed Using Ozonated Water)

  • 이진주;이기세
    • 공업화학
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    • 제31권3호
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    • pp.341-345
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    • 2020
  • 하폐수처리 및 정수처리에 사용되는 활성탄 흡착 공정에서 기존의 활성탄 열재생법 비해 활성탄 손실과 불완전 연소로 인한 오염물질 발생도 적으며, 사용 활성탄의 인발-재생-재충진에 소요되는 시간의 절약이 가능한 재생 방법으로 오존수를 이용한 in situ regeneration에 대한 기초연구를 수행하였다. 활성탄 흡착 컬럼 상에서 페놀(phenol) 및 PEG를 흡착 파과 시킨 후 오존수 접촉으로 흡착물질을 분해 제거하는 흡착-재생 싸이클을 반복하였다. 오존수 접촉에 의한 재생 횟수가 증가할수록 페놀 흡착용량은 어느 정도 감소하지만, 일정 수준으로의 감소 후에는 구조 변화가 안정화되어 추가적인 감소가 일어나지 않았다. 흡착 용량이 감소하는 이유는 오존과의 반응에 의해 활성탄의 미세공 크기가 증가하면서 비표면적이 감소하기 때문으로 나타났다. 이러한 세공 크기의 변화와 비표면적의 변화로 인하여 재생 후 in-pore adsorption이 우세한 페놀과 같은 저분자량 물질의 흡착효율은 감소하게 되나 external adsorption 비율이 큰 PEG와 같은 고분자량 물질의 흡착효율은 크게 영향을 받지 않았다. 세공 크기 및 비표면적의 변화는 오존수와의 접촉시간이 길어질수록 심화되므로 제거하려는 물질의 크기를 고려하고 접촉시간을 조절함으로써 흡착 효율의 유지를 제어하는 것이 필요하다.

RFID를 이용한 도로하부 공동 관리 시스템의 현장 적용을 위한 기초 실험 (A Fundamental Experiment for Field Application of the under Pavement Cavity Management System Using RFID)

  • 신은철;박광석;박정준
    • 한국재난정보학회 논문집
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    • 제15권3호
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    • pp.391-401
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    • 2019
  • 연구목적: 본 연구는 도로함몰 예방을 위하여 공동탐사시 확인된 공동 중 포장층의 재포장 공사 등에 의한 공동관련 위치 및 이력 정보를 알 수 없게 되어 누구라도 정보를 정확하게 파악할 수 있도록 할 수 있는 RFID(Radio Frequency Identification) 시스템의 현장 적용성을 검토하는 것이다. 연구방법: RFID 시스템에 의한 공동 인식거리, 인식 여부와 인식율, 태그 성능과 태그 종류, 리더기 간섭, 통신, 지하 매설물 영향, 중복 인식 등에 대하여 현장 적용성을 위한 기초실험을 수행하였다. 연구결과: 태그와 리더기 인식 심도, 태그 정보 입력 및 리더기 인식 여부 결과, 기초 실험에 적용된 전자태그칩과 리더기는 도로 공동이 위치한 현장 환경에서 효과적으로 적용성이 있는 것으로 판단된다. 결론: 포장도로관리스템의 현장 적용을 위한 RFID 태그에 공동위치를 포함하여 공동에 관한 확인 일자, 공동의 규모, 발생원인, 주변 지하매설물 등의 여러 가지 제반 정보를 저장하여 전산화 및 모바일 활용도 가능한 시스템으로 공동관리 효과를 극대화 할 수 있다.