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윈도우 환경에서 카카오톡 데이터 복호화 및 아티팩트 분석 연구
조민욱,장남수 한국정보보호학회 2023 정보보호학회논문지 Vol.33 No.1
카카오톡, 라인, 페이스북 메신저 등과 같은 메신저는 누구나 사용하는 범용적인 의사소통 수단이다. 사용자들에게 제공되는 편의 기능과 사용 시간이 증가할수록 아티팩트 안에 남게 되는 사용자의 행위 정보 또한 증가하고 있으며, 이는 디지털 포렌식 수사 관점에서 중요한 증거로 활용되고 있다. 그러나 보안상의 이유로 현재 대부분의 데이터는 암호화되어 저장되고 있다. 또한, 의도적인 조작, 은닉, 삭제 등의 은폐 행위가 증가하여 디지털 포렌식 분석 시간이 지연되는 문제를 야기하고 있다. 본 논문에서는 국내에서 가장 많은 사용자를 가진 메신저인 카카오톡에 대해 Windows 환경에서 데이터 복호화 및 아티팩트 분석 방안에 관한 연구를 수행하였다. 효율적인 복호화 키 획득 방안, 삭제 시도한 메시지 식별 및 복호화 방안을 제시하고 썸네일 아티팩트를 분석한다.
Guidelines for Designing of the Smart Heated Clothing through the User Needs Survey
Min-Uk Cho(조민욱),Yong-Ku Kong(공용구),Kyeong-Hee Choi(최경희),Hyun-Ho Shim(심현호),Jae-Kyeong Kim(김재경),Sang-Won Lee(이상원),Sooyeon Leem(임수연),Wonyoung Jeong(정원영),Siyeon Kim(김시연),Chae-Won Park(박채원) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10
김재경,공용구,최경희,조민욱,김승연,김민정,이준협,박채원 한국안전학회 2020 한국안전학회지 Vol.35 No.3
At the construction site of the driving site, the pile rebound and penetration measurements are performed manually to determine the end point of the driving operation, thereby causing the measurer to be exposed to a death accident. In this study, in order to eliminate the risk of this work, a non-contact penetration measuring device was developed and usability evaluation was conducted. The penetration measuring device is manufactured based on the ultrasonic sensor, and can be combined with the pile to deliver the data in real time, and the delivered data can be output in real time on the portable PC and the final penetration can be calculated. Usability evaluation on the device was conducted by comparison with manual work. Usability evaluation was largely evaluated on measured values, subjective comfort, and body parts comfort. The result of the measured value tended to overestimate the value measured manually by the measuring device, which is similar to the previous research. In terms of subjective comfort and body part comfort, overall satisfaction was higher than the manual method when using the measuring device. Taken together, these results indicate that it is possible to use the rudder measuring device in place of manual work in the construction site, and it is judged that the worker's comfort is greatly increased by using the measuring machine. The results of this study suggest that the use of non-contact measuring device in the field can be used as basic data to support them
이기정(Ki Jung Lee),조민욱(Minuk Jo),Fu Chen(付琛),은경태(Kyoungtae Eun),오해관(Haekwan Oh),좌성훈(Sung-Hoon Choa),양상식(Sang Sik Yang) 대한전기학회 2014 전기학회논문지 Vol.63 No.4
Piezoresistive-type, capacitive-type, and optical-type sensors have mainly been used for measuring a strain. However, in building a sensor network for remote monitoring using these conventional sensors there are disadvantages such as the complexity of a measuring system including wireless communication circuitry and high cost. In this paper, we demonstrates a highly-sensitive surface acoustic wave (SAW) strain sensor which is advantageous to harsh environments and wireless network. We designed and fabricated the SAW strain sensor. The SAW strain sensor attached on a specimen was tested with a tensile tester. The strain on the sensor surface was measured with a commercial strain gauge and compared with that obtained from strain analysis. The central frequency shift of the SAW sensor was measured with a network analyzer. The sensitivity of the SAW strain sensor is 134 Hz/με which is high compared to previous results.