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오진태,임채성 부산교육대학교 초등교육연구소 1995 초등교육연구 Vol.6 No.-
This study examined the changes of stomatal distribution(density, frequency) in a few plants with the variation of changes in soil-water. Commelina communis L., which is one of C_3 plants, have anomocytic type of stomata. Digitaria sanguianalis Scop. which belongs to C_4 plants, and Portulaca oleracea L. which is CAM plants, have paracytic, and anisocytic types of stomata, respectively. In C. communis L., the stomatal size of upper side of leaves was greater than that of lower parts. In both of D. sanguianalis Scop. and P. oleracea L., this trend was opposite. As the moisture in soils decreased, the stomatal size was decreased. The stomatal densities in these three species were greater in lower sides than those of upper sides. Finally, the stomatal densities of these plants showed trends of more stomata per unit area as the moisture of soil decrease. These results suggest that the plants adopt the efficient water-use strategies.
교육대학원에 있어서 초등 과학교육 영역의 중요성과 그 운영방안
오진태,옥치율,한영욱,이형철,김용권,임채성 釜山敎育大學校 1994 부산교육대학 논문집 Vol.30 No.1
The future society is expected to be rapidly change in all areas, that is, the length of change time is becoming much smaller than that of generation time. It is very important to prepare the citizens who possess scientific literacy which actively cope with the rapid changes and specialization of society. The sources of rapid changes may be due to the developments in science and technology. Therefore, the importance of science education will be increasingly high. Scientific literacy should be improved basically and systematically from the early stages of formal education. Teachers who are responsible to educate children should be able to research in the areas of science education as well as science itself, and to have capacity to transmit them to the classroom. To do this, the graduate course and the science education within the system beyond the level of college education are essential parts of teacher education. In the graduate course, it is important that science itself and pedagogy of science should be balanced.
A Novel Application-Layer DDoS Attack Detection A1gorithm based on Client Intention
오진태,박동규,장종수,류재철,Oh, Jin-Tae,Park, Dong-Gue,Jang, Jong-Soo,Ryou, Jea-Cheol Korea Institute of Information Security and Crypto 2011 정보보호학회논문지 Vol.21 No.1
서버의 응용계층에 대한 DDoS 공격은 매우 적은 량의 패킷으로 효과적인 공격이 가능하며, 공격 트래픽이 정상 트래픽과 유사하여 탐지가 매우 어렵다. 하지만 HTTP 응용계층 공격 트래픽에는 사용자 의도에 의한 특성이 있음을 찾았다. 정상 사용자와 DDoS 공격자는 동일하게 TCP 계층에서 세션을 맺는다. 이후 최소 한번의 HTTP Get 요구 패킷을 발생한다. 정상적인 HTTP 요구는 서버의 응답을 기다리지만 공격자는 Get 요청 직후 세션을 종료한다. 이러한 행위는 사용자 의도에 의한 차이로 해석할 수 있다. 본 논문에서는 이러한 차이를 기반으로 응용계층 분산서비스 거부 공격 탐지 알고리즘을 제안하였다. 제안된 알고리즘은 정상 네트워크와 봇 기반 분산서비스거부 공격 툴에서 발생한 트래픽으로 실험되었으며, 거의 오탐 없이 HTTP-Get 공격을 탐지함을 보여 주였다. An application-layer attack can effectively achieve its objective with a small amount of traffic, and detection is difficult because the traffic type is very similar to that of legitimate users. We have discovered a unique characteristic that is produced by a difference in client intention: Both a legitimate user and DDoS attacker establish a session through a 3-way handshake over the TCP/IP layer. After a connection is established, they request at least one HTTP service by a Get request packet. The legitimate HTTP user waits for the server's response. However, an attacker tries to terminate the existing session right after the Get request. These different actions can be interpreted as a difference in client intention. In this paper, we propose a detection algorithm for application layer DDoS attacks based on this difference. The proposed algorithm was simulated using traffic dump files that were taken from normal user networks and Botnet-based attack tools. The test results showed that the algorithm can detect an HTTP-Get flooding attack with almost zero false alarms.
오진태 부산교육대학교 과학교육연구소 1993 科學敎育硏究 Vol.18 No.-
A group of Protophyta occurring at times in enormous numbers in the sea are the flagellates and the diatoms. A few species are toxic and may multiply rapidly into such dense populations as to cause the deaths of fish and organisms, and then are popularly known as "red-tide", these dense populations occasionally occurring, for example, off the coast of Chinhae Bay, Masan Bay, Kosung Bay and Onsans Bay of Korean southern seashore. These "red-tide" which was caused by the population explotion of phytoplankton are the important problems of seashore culture in Korean seashore areas. These population increases in the phytoplankton tend to occur when high tempreatures(>16℃) coincide with heavy rainfall, which is thought to cause run-off of industrial pollutions and everylife waste substances into the bays from urban district heavily enriched with nitrates. Red-tides have therefore become a major issue for the seashore culture. This study has investgated the organisms and environment factors of red-tide, physico-chemical parameters and eutrophication. These must be taken as an environmental problem of water pollutions.
오진태,임채성 부산교육대학교 초등교육연구소 1996 초등교육연구 Vol.9 No.-
The purpose of this study are to analyze the nature of STS education and to suggest its effective teaching method based on the brain functions of school children. In the future, the scientific literacy will be increasingly influence our daily lives. Science proposes explanations for observations about the natural world, and technology proposes solutions for problems of human adaptation to the environment. Many scientist, science educators, and other citizens are becoming increasingly concerned about the societal implications of science and technology. A major reason for tease concerns is that what is discovered through science and technology can be used for the benefit or detriment of society. So it can be concluded the science, technology, and society have very close relationships. In science teaching, STS themes should be used purposely. One efficient way to do this is to help children identify STS issues and problems that are relevant to their everyday lives and society in general. It should be focused on a variety information, knowledge, ideas, or cognitive styles contained in children's brain. When these various ideas or information are incorporated via genuine cooperative activities, more large, or creative ideas that would be key role in solving ambiguous problems such as STS issues can be generated. This aspect of teaching can be used to enhance the abilities of children in solving problems.