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A Study on the Dos Prevention System for SPT-based Sync Flooding Protection
Keun-Heui Kim,Young-Mo Kang,Mi-Ran Han,Jong-Bae Kim 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.12
Sendmail, an open-source-based software, is the most typical mail system that uses SMTP (Simple Mail Transfer Protocol). SMTP (Simple Mail Transfer Protocol), a protocol to deliver various types of files and messages, is being utilized not only in E-MAIL, but also in MMS (Multimedia Message Service) data transfer in mobile environment. Sendmail, an open source based software, is the most typical in mail systems using SMTP. It is exposed to service denial attacks such as mass spam mail because of its process structure that is vulnerable to external service attacks. In this paper, we discuss our design of a security architecture that can respond efficiently to mass mail and Sync Flooding attacks from the internet. Also, to apply our proposed service denial attack security architecture, we used SPT (Safe Proper Time) technology, which ensures the reliability of TCP/IP communication. By analyzing the pros and cons of the security architecture in accordance with each phase of the network, we propose a network architecture that can most efficiently fight external malicious attacks.
Designing and Implementing of Dos Prevention System for SPT-based Sync Flooding Protection
Keun-Heui Kim,Young-Mo Kang,Mi-Ran Han,Jong-Bae Kim 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
In this paper, we design a security architecture that can respond efficiently against the mass mail and Sync Flooding attacks incoming from the external Internet. Also, in order to apply the service denial attach security architecture proposed in this paper, it applies SPT (Safe Proper Time) technology that ensures the reliability of TCP/IP communication. By analyzing the pros and cons of the security architecture in accordance with each phase of the network, it proposes a network architecture that can respond in the most efficient against external malicious attacks.
형광 Differential Display법에 의한 파리지옥풀 포충잎트랩 특이발현 유전자 탐색
강권규,이근향,박진희,홍경의,Kang, Kwon-Kyoo,Lee, Keun-Hyang,Park, Jin-Heui,Hong, Kyong-Ei 한국식물생명공학회 2003 식물생명공학회지 Vol.30 No.4
파리지옥풀 first trap leaf에만 발현하는 유전자군을 탐색하기 위하여 기내배양 식물체와 포충능력을 가진 3년생 실생주을 이용하여 각각의 포충잎 (leaf base), 꽃조직 (flower tissue) 및 포충잎트랩 (first trap leaf)으로부터 분리한 RNA로 Fluorescent differential display (FDD)를 실시하였다. First trap leaf특이발현 유전자 15개를 screening하여 염기서열을 분석하였다. 분리된 DNA들은 protease inhibitor (Pl), myo-inositol-1-phosphate synthase 및 lipocalin-type prostaglandin D syn-thase 유전자들과 매우 유사하였다. 또한 Northern blot분석 결과, 이들 유전자들이 first trap leaf에 특이적으로 발현하고 있는 것을 확인하였다 FDD방법은 세포, 조직 및 기관에 특이적으로 발현하고 있는 유전자들을 선발하는데 매우 유용한 수단으로 사용될 수 있다. Fluorescent differential display (FDD) is a method for identifying differentially expressed genes in eukaryotic cells. The mRNA FDD technology works by systematic amplification of the 3' terminal regions of mRNAs. This method involve the reverse transcription using anchored primers designed to bind 5'boundary of the poly A tails, followed by polymerase chain reaction (PCR) amplification with additional upstream primers of arbitrary sequences. The amplified cDNA subpopulations are separated by denaturing polyacrylamide electrophoresis. To identify the genes involved in the development of first trap leaf, we applied a FDD method using mRNAs from leaf base, first trap leaf and flower tissue, respectively. We screened several genes that expressed specifically in first trap leaf. Nucleotide sequence analysis of these genes revealed that these were protease inhibitor (PI), myo-inositol-1-phosphate synthase and lipocalin-type prostaglandin D synthase. Northern blot analysis showed that these genes were expressed specifically in first trap leaf (in vivo and in vitro). FDD could prove to be useful for simultaneous scanning of transcripts from multiple cDNA samples and faster selection of differentially expressed transcripts of interest.
DEVELOPMENT OF SEMI-VLBI SYSTEM AND OBSERVATION OF SUN AT 21 cm
Park Yong-Sun,Kang Hyun-Woo,Kim Hyo-Uk,Kang Heui-Jeong,Jee Myeong-Keun,Lee Sul-Gi,Ahn Jung-Hyun,Kim Jin-Su,Shin Young-Soo,Kang Song-Hun The Korean Astronomical Society 2006 Journal of The Korean Astronomical Society Vol.39 No.2
We report the development of a semi-VLBI observation system operating at 21 cm and present the measurement of visibility function toward the sun using this system. The system consists of two 2.3 meter antennas with a maximum separation of 35 meter, a conventional high speed data acquisition system, and a set of programs for software correlation. Since two local oscillators of receiver modules are independent, data had to be fringe-fitted to yield the visibility amplitude. It is found that the visibility amplitude decreases and then bounces back as baseline increases. We confirm that solar disk with brighter limb best explains the measured visibility amplitude.