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Interferences of various gases on porous glass-based formaldehyde sensors
Satoru Tokumitsu,Katsuyuki Izumi,Masahiro Utiyama,Yasuko Y. Maruo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In order to examine the influences of various gases on sensor elements developed recently for the detection of gaseous formaldehyde, experiments were made in which the elements were exposed to air including one of the test gases. The elements are made of a porous glass sheet in which β-diketone (acetylacetone or 1-phenyl-1,3-butanedione) and ammonium ion are impregnated and both of the elements turn yellow from colorless upon exposures to formaldehyde. The experiments were made under a concentration of 2000ppm and a 50% relative humidity. As a result, aromatics such as benzene, toluene and ethylbenzene were found to cause no color changes. On the other hand, aldehydes and compounds having one or more C-C double bonds turned the two elements yellow. However the effects of these compounds are expected to be negligible under the realistic conditions, in view of the facts that the values of absorbance of light at peak wavelengths for these compounds were small and that the concentrations of the gases tested in this study were several orders of magnitude higher than those in the real atmosphere, even in the indoor environment.
Daichi Ono,Satoru Izumi,Toru Abe,Takuo Suganuma 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Due to the diversification of devices and the spread of the Internet, many people are handling information over the network and the threat of cyber-attacks by unauthorized access and malware is also considered as a problem, and countermeasures against these threats are an urgent issue. SDN and OpenFlow are useful for network cybersecurity counter-measures because they can collect traffic statistics from switches and can interrupt communication at the switch level. In this study, we focus on detecting a port scanning as a preparation stage for cyber-attacks. In this paper, we propose port scan detection method based on the characteristics of Packet-In messages in an OF network. Also, we show its effectiveness through the experiments.