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리플렉션과 문자열 암호화를 이용한 안드로이드 API 난독화 도구
이주혁 ( Joo Hyuk Lee ),박희완 ( Hee Wan Park ) 한국정보처리학회 2015 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.4 No.1
자바 리플렉션은 프로그램 구성 요소들을 조사하여 호출 및 조작할 수 있는 자바 언어의 기능이다. 이를 이용하면 보다 많은 호출 단계를 거치는 구조로 변형되기에 난독화 효과를 얻을 수 있다. 그러나 이를 이용할 때, 프로그램 자체의 구성 요소 이름이 문자열 형태로 노출된다. 본 논문에서는 안드로이드 애플리케이션에서 리플렉션을 적용하여 난독화하고, 이때 노출되는 문자열들을 비즈네르 암호화 알고리즘으로 은닉하여 정적분석을 방해하는 기법 및 도구를 제시한다. 실험 결과 소스 코드의 전체적인 복잡도를 증가시키는 데 효과가 있었다. 또한 서버와 로컬 기반의 두 가지 복호화 방법을 제공하는데, 이는 애플리케이션의 실행속도에 영향을 미치기 때문에 API의 중요도에 따라 선택할 수 있다. Reflection is a feature of the Java programming language that can examine and manipulate components of program itself. If you use the reflection, you can get an obfuscation effect of Java source because it converts sources into complicated structures. However, when using it, strings of components name of program are exposed. Therefore, it cannot prevent static analysis. In this paper, we presents a method and a tool of interfere with static analysis using reflection. And in this case, exposed strings are encoded using Vigenere cipher. Experimental results show that this tool is effective in increasing the overall complexity of the source code. Also the tool provides two types decryption method based on server and local. It can be selected based on the importance of the API because it affects the execution speed of the application.
자바 리플렉션 기반의 안드로이드 API 난독화를 위한 자동 변환 도구의 설계 및 구현
이주혁 ( Joo-hyuk Lee ),박희완 ( Heewan Park ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
리플렉션은 자바 프로그램을 실행하여 객체 내부의 모든 요소를 조사하거나 호출 혹은 조작할 수 있는 자바 언어의 한 기능이다. 한 클래스 내부의 메소드에 리플렉션을 적용하여 호출하게 되면 String형의 메소드 이름으로 간접 호출하기에 정적 분석 도구의 API 호출 탐지를 방해하게 되어 분석결과의 정확도를 떨어뜨릴 수 있고, 또한 일반적인 호출보다 복잡한 절차를 거치게 되어 소스 자체의 난독화 효과를 갖게 된다. 또한 디컴파일러의 역공학 분석을 어렵게 만드는 장점도 있다. 이 특성을 이용한다면 안드로이드 환경에서 특정 API를 은닉하여 개인정보를 누출하도록 악용하거나 디컴파일러 이용을 방지하는 데 활용될 수 있다. 본 연구에서는 안드로이드 환경에서 직접 설계한 도구와 표본 앱을 이용하여 API 메소드에 리플렉션을 적용하고, 원본 소스와 리플렉션 후 디컴파일된 소스를 비교하여 API 호출이 리플렉션을 통해서 은닉 가능함을 보여준다.
이주혁 ( Joo Hyuk Lee ),김성복 ( Sung Bok Kim ),조국영 ( Kuk Young Cho ) 한국공업화학회 2015 공업화학 Vol.26 No.3
Polymeric membranes have been used in various applications and generally applied to the systems prevented from exterior exposure. However, polymer membranes for outdoor usages such as, an air quality monitoring and membrane reservoirs for the selective recovery of useful metals from seawater, have been newly developed. Thus it is required to investigate the properties of the membrane for the outdoor use and also studies of the accelerated UV exposure onto the polymeric membranes are essential to estimate their weatherability. Herein, we report on the thermal and mechanical properties, morphology changes, and color differences of the polysulfone anisotropic membranes and non-woven type polypropylene membranes with the accelerated UV exposure. Results showed that the effect of UV exposure on the membrane depend not only on the polymer used but also on the form of the membrane. This work can provide some of key informations of the membrane for outdoor use.
마르크 샤갈의 작품에 표현된 조형적 특성 분석을 통한 네일 디자인 연구
이주혁 ( Joo-hyuk Lee ),이유나 ( Yu-na Lee ),임희경 ( Hee-kyung Lim ) 한국미용예술경영학회 2015 미용예술경영연구 Vol.9 No.4
Today nail art is simply fingernails, toenails Do not really manage to raise the nail of people receiving stress management and their being used as a means of self-expression that can express your personality. That is today's nail art fashion, beauty was a part of and further enhance the personal charm can increase the good feeling through them, and has a big role in the self-satisfaction. Fashion, beauty nail art place to catch a variety of designs and this area is expressed in the concept of a planned theme nail art and has been developed with various designs are required for this look. These social requirements are simply nail in the design or configuration works not only as a coloring being affected by social and artistic zeitgeist, and it also has a big role to play in exploring and trying new design foundation. In this study, only the centuries have passed since we produce nail design based on work analysis exploring the emblematic nature as the work of a magician Marc Chagall's color being talked about even now motif of looking at the transition course of his life and works and works . Marc Chagall works were a total of four works were selected on the basis of analysis of the design magazines, books, Web sites, papers relating thereto prior to selecting a motif. Themes and lines appear in the Selected works motif, cotton, color analysis was divided into grasp the characteristics of color through color distribution, color analysis to analyze the formative characteristic configuration of the original design was shown to work was the design. Production method works with colors, geometric patterns, cotton, inspired by the lines of gradient nail art techniques, flat art techniques, hand-painting techniques, and creates works using a UV gel technique. The results of this study different techniques and colors contained Chagall's work was creative nail design based on the future We expect a high quality variety of nail design has created hope.
신사임당의 작품 <초충도>를 모티브로 한 네일아트 디자인 연구
이주혁 ( Joo-hyuk Lee ),김민경 ( Min-kyung Kim ),장병초 ( Bing-chao Jiang ) 한국미용예술경영학회 2014 미용예술경영연구 Vol.8 No.3
Cultural industries of modern society are greate effect on the world, according to the passing of time each country has commercialized a variety of content based on the country's culture. Recently, Nail industry is being considered as a component of total fashion that can represent the personality of the consumer rather than a simple coloring hands and feet. The social and cultural elements and Nail industry growth, it is necessary to develop a diverse and creative designs that can meet the needs of customers in the design elements of the Nail art. In this study, the Korean aesthetic expression in the 16th century and early stratification unique painting style called one factor that so inspired by the work of Sinsaimdang with excellent workmanship Nail subdivided into the development of the industry and main perpose is develople of Nail design. Chochungdo works were selected for a total of four books about him, the preceding paper, we analyze the design and selection based on the motif. Were prepared for each piece illustrated image was produced a total of four works by Nail art techniques. Creative Nail design for this study based on the paintings of Korea's traditional aesthetics were contained We expect accordingly forward a variety of high quality Nail design to get out.
태양광 발전 시스템용 소프트 스위칭 다상 부스트 컨버터
이주혁(Joo-Hyuk Lee),김재형(Jae-Hyung Kim),장수진(Su-Jin Jang),원충연(Chung-Yuen Won),정용채(Yong-Chae Jung) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 소프트 스위칭 다상 부스트 컨버터 회로를 제안하였다. 태양의 일사량 및 주위온도 등에 의해 출력전압의 변동이 많은 태양전지로부터 정전압을 얻기 위해서 고효율의 전력변환 장치가 필요하다. 제안된 컨버터를 이용하여 동작 범위 내에서 변동하는 입력전압을 정출력전압으로 제어하고, 입력전류 리플과 출력전압 리플을 저감시킬 수 있다. 또한 ZVS, ZCS를 이용하여 스위칭 순간에 Turn-on, Turn-off 손실을 감소할 수 있다. 본 논문에서는 소프트 스위칭 다상 부스트 컨버터를 적용하여 시뮬레이션을 수행하였다.
이주혁(Joo-Hyuk Lee),김재형(Jae-Hyung Kim),원충연(Chung-Yuen Won),정용채(Yong-Chae Jung) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Generation system using regenerative energy like photovoltaic, fuelcell is increased, PCS technology coming into the spotlight. The efficiency of DC-DC converter as part of the PCS is very important, multi-phase boost converter has more advantage than other topology. Input current of the multi-phase boost converter is divided into two inductor current because of parallel structure of the boost converters, thus it has features of decreasing input current ripple and output voltage ripple. Also multi-phase boost converter with soft switching can decrease switching loss using ZCS and ZVS. In this paper, simulation and experiment are performed to verify operation of the proposed converter, and efficiencies of the conventional and proposed converter are compared.
이주혁(Joo-Hyuk Lee),장수진(Su-Jin Jang),차길로(Gil-Ro Cha),원충연(Chung-Yuen Won),정용채(Yong-Chae Jung) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.11월
In this paper, we composed solar generation system with multi-phase interleaved boost converter. Solar generated voltage is low, so it has need of the boost power conversion device for supply power to normal load. The multi-phase interleaved boost converter is easy to boost voltage and it can be reduced both input current ripple and output voltage ripple because it is composed with multi-phase. We simulated and tested multi-phase interleaved boost converter applied three-phase.