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보안 기능이 내재된 FTP 서버-클라이언트 설계 및 구현
안재원 ( Jae-won Ahn ),최범진 ( Bum-jin Choi ),옥성진 ( Sung-jin Ok ),강정하 ( Jung-ha Kang ),김은기 ( Eun-gi Kim ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
FTP(File Transfer Protocol)는 호스트에서 다른 호스트로 파일을 전송하기 위한 프로토콜로써, 데이터를 평문으로 전송하기 때문에 기밀성이 보장되지 않는다. 현재 보안 기능이 제공되는 FTP 로 FTPS(FTP over SSL)가 있다. FTPS 는 TLS(Transport Layer Security)와 SSL(Secure Socket Layer) 암호화 프로토콜 기반에서 동작하는 FTP 이다. 따라서 FTPS 는 TLS 와 SSL 과 같은 추가적인 시스템이 반드시 필요한 단점이 있다. 본 논문에서는 추가적인 암호화 프로토콜 없이 FTP 내에서 보안 기능을 제공하는 Secured FTP 를 제안하였다. 본 논문에서 제안한 Secured FTP 는 FTP 내에서 Diffie-Hellman 알고리즘을 이용하여 비밀 키를 교환하고 AES(Advanced Encryption Standard)-Counter 알고리즘을 이용하여 FTP 데이터를 암호화 및 복호화하도록 설계하였다. 본 논문에서 제안한 Secured FTP 를 Linux 운영체제에서 구현하였고 시험을 통하여 비밀 키가 정상적으로 교환되고, FTP 데이터가 암호화되어 전송되는 것을 확인하였다.
압전 캔틸레버 구조를 이용한 도로용 에너지 하베스터의 개발 및 평가
김창일,김경범,전종학,정영훈,조정호,백종후,강인석,이무용,최범진,조영봉,박신서,남산,이영진,Kim, Chang-Il,Kim, Kyung-Bum,Jeon, Jong-Hac,Jeong, Young-Hun,Cho, Jeong-Ho,Paik, Jong-Hoo,Kang, In-Seok,Lee, Moo-Yong,Choi, Beom-Jin,Cho, Young-Bong 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7
A road energy harvester was designed and fabricated to convert mechanical energy from the vehicle load to electrical energy. The road energy harvester is composed of 24 piezoelectric cantilevers and a vehicle load transfer mechanism. Applying a vehicle load transfer mechanism rather than directly installing energy harvesters under roads decreases the area of road construction and allows more energy harvesters to be installed on the side of the road. The power generation amount with respect to the vehicular velocity change was assessed by installing the vehicle load transfer mechanism and the energy harvester in the form of speed bumps and underground. The energy harvester installed in a speed bump form generated power of 7.61 mW at the vehicular velocity of 20 km/h. Also, power generation of the energy harvester installed in the underground form was 63.9 mW at the vehicular velocity of 28 km/h. Although the number of piezoelectric cantilevers was reduced by 1/3 to 24 in comparison to the previous research results with 72 piezoelectric cantilevers, similar power generation characteristic value was obtained within the vehicular velocity of 20 km/h by altering the vehicle load transfer mechanism and cantilever vibration method.
압전 캔틸레버 구조와 차량하중 전달방법에 따른 도로용 에너지 하베스터의 설계 및 평가
김창일,김경범,정영훈,이영진,조정호,백종후,강인석,이무용,최범진,박신서,조영봉,남산,Kim, Chang-Il,Kim, Kyung-Bum,Jeong, Young-Hun,Lee, Young-Jin,Cho, Jeong-Ho,Paik, Jong-Hoo,Kang, In-Seok,Lee, Moo-Yong,Choi, Beom-Jin,Park, Shin-Seo,Cho, 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
A road energy harvester was designed and fabricated to convert mechanical energy from the vehicle load to electrical energy. The road energy harvester is composed of 16 piezoelectric cantilevers. We fabricated prototypes using a vehicle load transfer mechanism. Applying a vehicle load transfer mechanism rather than directly installing energy harvesters under roads decreases the area of road construction and allows more energy harvesters to be installed on the side of the road. The power generation amount with respect to the vehicular velocity change was assessed by installing the vehicle load transfer mechanism form and underground form. The energy harvester installed in the underground form generated power of 4.52 mJ at the vehicular velocity of 50 km/h. Also, power generation of the energy harvester installed in the vehicle load transfer mechanism form was 48.65 mJ at the vehicular velocity of 50 km/h.
Cumberland 발목 불안정성 도구에 의한 안정성과 불안정성 발목의 균형 비교
김기종 ( Ki Jong Kim ),제갈혁 ( Gal Hyuk Je ),전현주 ( Hyun Ju Jun ),최범진 ( Bum Jin Choi ),최현진 ( Hyun Jin Choi ),유성훈 ( Seong Hun Yu ),김용억 ( Young Eok Kim ) 대한물리의학회 2013 대한물리의학회지 Vol.8 No.3
PURPOSE: The purpose of this study was to investigate the comparison of balance on Stable Ankle(SA), Instability Ankle(IA) using Cumberland Ankle Instability Tool(CAIT). METHODS: Total 54(SA: 27, IA: 27) subjects were volunteered to participate in the study. SA can be defined CAIT score ≥ 28, with no history of injury to ankle. IA can be defined persisting symptoms of giving way and ≤ 24 on the CAIT after ankle sprain. the balance measured using Biodex Balance System®(BBS). BBS instability protocols used static, dynamic balance level less stable(2), moderate stable(4) and level more stable(8). RESULTS: There were significant differences at overall,Anterior-Posterior(AP), Medial-Lateral(ML) of static balance, dynamic balance level 2, 4. The dynamic balance level 8 found significant difference at ML, but not found significant differences at overall, AP. CONCLUSION: We suggest that CAIT is acquired more exact information for IA intervention, as balance measured.