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디지털포렌식 관점의 안드로이드 Lock 기능 분석 방안 연구
조재완(Jae-Wan Cho),박태형(Tae-Hyoung Park),이상진(Sang-Jin Lee) 한국디지털포렌식학회 2012 디지털 포렌식 연구 Vol.- No.9
스마트폰의 사용이 증가함에 따라 스마트폰은 범죄 사건과 연관된 직/간접적 디지털 증거를 처리 ․ 보관하는 중요한 매개체가 되었다. 그러나 스마트폰 운영체제 자체에서 제공하는 잠금 기능을 사용하거나 앱마켓 등에서 쉽게 다운 받을 수 있는 잠금 기능의 어플을 사용하는 경우 특정 파일에 대한 은닉, 암호화 또는 특정 어플 실행 방지 등 디지털 증거를 부정(Anti-Forensic) 할 수 있게 되어 관련 증거를 수집 ․ 처리하는데 있어 어려움을 겪을 수 있다 따라서 본 논문에서는 현재 스마트폰 시장에서 높은 점유율을 확보하고 있는 안드로이드 OS기반 스마트폰에서 각종 잠금 기능을 사용할 때 설정하는 비밀번호에 대한 저장 방식과 획득 방법을 연구한다. 이러한 연구를 통해 스마트폰에서 보관되는 디지털증거에 대한 수집 ․ 처리를 용이하게 하고, 스마트폰에서 확보한 비밀번호를 이용하여 스마트폰 사용자의 다른 디지털 기기의 접근 제어 암호 해독 또는 암호화된 파일을 해독하는데 도움이 될 것으로 기대한다. Since the use of smartphone increased, smartphone has become a very important medium that handles or archives digital evidence, which may be directly or indirectly related to a criminal case. However, it may be difficult to collect and process relevant evidence in case of using the lock function provided by the smartphone OS or an application easily downloaded from the App Market, since such function enables anti-forensic techniques that conceal or encrypt certain files or block the execution of an application. Therefore, this study is about examiing methods of collecting and archiving passwords required for using various lock functions in Android OS smartphones. This study is to facilitate the process and collection of digital evidence archived in smartphone and to help decipher an encrypted file or a password needed for a user to control the access to other digital devices.
이동성 위치기반 증강현실(LBMS-AR)시스템 적용 현장체험 학습활동 프레임워크 개발
조재완(Jae Wan Cho),김은경(Eun Gyung Kim) 한국IT서비스학회 2019 한국IT서비스학회지 Vol.18 No.5
In this study, we developed the Field-Experiential Learning Framework Using the Location Based Mobil-learning System (LBMS) and it is mobile Augmented Reality (AR) for smart learning system which is advanced e-learning. AR is technology that seamlessly overlays computer graphics on the real world. LBMS-AR has become widely available because of mobile AR. Mobile AR is possible to get information from real world anytime, anywhere. Nowadays, there are various areas using AR such as entertainment, marketing, location-based AR. We analysed the result of survey and implemented the functions. Also, for survey about application s effectiveness, we have focus group interview (FGI). Then we demonstrated and explained the application to them. The result of survey about application s effectiveness shows that application have higher utilization in education area. One of the most promising areas is education. AR in education shows lifelike images to users for realism. It s a good way for improving concentration and attention. We utilize only a beacone for image-based AR without other sensor.
조재완(Jai Wan Cho),이재철(Jae Cheol Lee),최유락(Yu Rak Choi) 제어로봇시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.7
An ultrasonic acoustic leak detector was designed / manufactured to detect piping leakage. The ultrasonic acoustic leak detector board designed / manufactured in this paper was tested in accordance with the American Society for Testing and Materials ASTM E1002-05 class II. There were 10 ultrasonic leak detector boards designed / manufactured, and 2 outdoor, 1 indoor, and 2 mechanical noise environments were used for the tests. Performance verification tests were conducted in three ways. The intensity of the ultrasonic acoustic signal emitted from a nozzle having a size of 0.2 mm under a gauge pressure of about 70 kPa was measured at a distance of 5 m or more. The result of the experiment and verification is described.
칼라 CCD 영상을 이용한 고휘도 LED 전구의 빔 열화 분석
조재완(Jai-Wan Cho),최영수(Young-Soo Choi),이재철(Jae-Chul Lee),구인수(In-Soo Koo),홍석붕(Seok-Boong Hong) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.6
VLC (Visible Light Communication) is a wireless communication method using light that is visible to the human eye. It has a major advantage that it causes no interference to RF-based devices. This makes wireless communication possible in RF hazardous areas such as nuclear facilities. In order to apply VLC communication in harsh environment of nuclear power plant, the high luminance LEDs, which are key components of the VLC communication, have been gamma-ray irradiated at the dose rate of 4 kGy/h during 72 hours up to a total dose of 288 kGy. The radiation induced color-center was formed in the LED housing cap made of transparent plastic or acryl material. The beam degradations of high luminance LEDs by high dose-rate gammaray irradiation are analyzed using color CCD image processing technology.