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형태보존암호를 이용한 Data-Oriented Network Architecture 보안도 개선에 관한 연구
김시온(Si On Kim),이상현(Sang Hyeon Lee),박은영(Eun Yeong Park),최승혁(Seung Hyeok Choi),이선영(Sun-Young Lee) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
식별 정보기반 네트워크 아키텍처로서 데이터의 이름 정보를 데이터화 하여 통신하는 기술인 DONA가 있다. DONA에서 통신에 사용되는 데이터 이름은 40byte 인 평문으로 이루어져 있다. 평문으로 이루어진 데이터 이름을 알게 되면 공격자는 사용자의 데이터를 확인할 수 있게 된다. 그러나 기존 암호화는 암호문의 길이와 데이터 타입이 변하기 때문에 암호화 된 데이터 이름을 사용하여 통신이 불가능하다. 따라서 본 논문에서는 정상적인 통신이 가능하도록 암호화 하여도 암호문의 길이와 데이터 타입이 바뀌지 않는 형태보존암호 FEA로 암호화 하는 방법을 제안한다.
군인 흡연자와 비흡연자의 구강환경변화와 구강건강에 대한 인식
김한솔 ( Han Sol Kim ),신보드미 ( Bodeumee Shin ),고은주 ( Eun Ju Goh ),김시온 ( Si On Kim ),조효선 ( Hyo Sun Jo ),박성은 ( Sung Eun Park ),강재경 ( Jae Kyoung Kang ) 한국치위생학회(구 한국치위생교육학회) 2014 한국치위생학회지 Vol.14 No.1
Objectives: The purpose of this study was to investigate the awareness towards oral health environmental changes and oral health in smokers and non-smokers in soldiers. Methods: Data were obtained from 350 soldiers serving at Unit M in Gwangju and Gyeonggi-do and ROTC candidates at University Y in Gyeonggi-do from April 28 to May 5, 2013. Collected data were analyzed by SPSS 12.0 program and a significant level was set at 0.05. Results: Non-smokers had more knowledge on tooth staining or gum diseases than smokers(p<0.05). The awareness towards the causes of oral cancer was not much different between the smokers and the non-smokers. The soldiers having dental health education tended to smoke less than those who had no education(p<0.05). The awareness towards individual oral health revealed no difference between the smokers and the non-smokers. Non-smokers had higher subjective knowledge on of the importance of the oral health, smoking influence on the oral health, and secondhand smoking impact on the health(p<0.05). Conclusions: The oral health education by the dental hygienists is very important in the military camps. Non-smokers tended to have higher knowledge on oral health than the non-smokers.
김시온 ( Kim Sion ),조은하 ( Jo Eunha ),최수훈 ( Choi Soohoon ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
In the current research, various conditions were evaluated to understand the release of fibrous microplastics and organic leachate from teabags. Six commercial teabags composed of 4 different plastic materials were tested under different temperatures, fiber damages, and water contact times. The main object of the research was to verify the amount of microplastics or organic leachate that may occur in tea consumed in our every day lives. The main focus was to verify the fibrous microplastic release and organic leachate of teabags under different damages. Damages of 1 ~ 10 cm were conducted on the teabags and submerged in glass vials under different temperatures. The teabags were cut with steal scissors of different degrees and the tea leaves were removed. Empty teabags were washed with deionized (DI) water for three trials before the experiments were conducted. Three empty teabags were submerged in every glass vial and submerged under constant temperatures in a water bath. the water bath contained a shaker where the samples were shaked during each trial. After being submerged in the water bath, the water from the teabags were filtered through a cellulous acetate membrane filter with pore sizes of 1 μm. Each filter was rinsed thoroughly and filtered with DI water before filtrations of the teabag samples. Filtered fibrous microplastics were counted with an optical microscope. Residual microplastics in the filtered water were analyzed with a TOC anayzer, dynamic light scattering analyzer, and SEM imaging. Results showed a logametric increase for both fibrous microplastic release and organic leachate with the increase of the damage inflicted on the teabags. Samples under higher temperatures also showed a higher release of the fibrous microplastics and leached TOC matter. The time for which the damaged teabags were submerged under water also showed a strong correlation with plastic release and TOC leaching. The hydraulic size of the filtered microplastics were in the size range of 1 nm to 2.4 μm. SEM resulted also showed similar sizes of microplastics with EDX results indicating the fibers as polymeric matters. The type of teabags and its assembly method also indicated a degree of influence in the release and leachate of the teabags. The current research has showed the amount of potential mircroplastic consumption via tea consumption.
김시온(Kim Si On),김수현(Kim Soo Hyun),정다윗(Jeong Da Wit),이상현(Lee Sang Hyeon),이선영(Sun-young Lee) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
COVID-19으로 인한 팬데믹 사태를 겪으며 일상의 대부분이 비대면으로 전환되었다. 이로 인하여 Zoom과 같이 실시간 화상 및 음성 공유가 가능한 프로그램이 주목을 받게 되었다. 실시간 통신 프로그램은 대부분 UDP 프로토콜을 사용하여 통신을 진행하는데 이때 정보를 보호하기 위해 오픈소스 형태의 DTLS를 같이 사용하여 보안성을 높인다. 본 논문에서는 DTLS프로토콜의 Feeder가 Host로부터 전달받은 데이터를 형태보존암호를 사용하여 암호화하는 기법을 기술한다. 형태보존암호를 사용하여 서버의 자원소모를 줄여 사용자에게 할당하는 자원을 늘릴 수 있도록 프로토콜을 설계하는 것을 제안한다.