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Kim Jongseol,Lee Ahmi,Moon Yong-Suk,So Jae-Seong,Koh Sung-Cheol The Microbiological Society of Korea 2006 The journal of microbiology Vol.44 No.1
We investigated the effects of halogenated aromatic compounds (HACs) including naturally occurring ones (L-thyroxine, 3-chloro-L-tyrosine, 5-chloroindole, 2-chlorophenol, 4-chlorophenol and chlorobenzene) on polychlorinated biphenyl (PCB) dechlorination in sediment cultures. A PCB-dechlorinating enrichment culture of sediment microorganisms from the St. Lawrence River was used as an initial inoculum. When the culture was inoculated into Aroclor 1248 sediments amended with each of the six HACs, the extent of dechlorination was not enhanced by amendment with HACs. The dechlorination patterns in the HAC-amended sediments were nearly identical to that of the HAC-free sediments except the 3-chloro-L-tyrosine-amended ones where no dechlorination activity was observed. When these sediment cultures were transferred into fresh sediments with the same HACs, the dechlorination specificities remained the same as those of the initial inoculations. Thus, in the present study, the substrate range of the highly selected enrichment culture could not be broadened by the HACs. It appears that HACs affect PCB dechlorination mainly through population selection rather than enzyme induction of single population.
Hyun-Kab Kim,Gyu-Sik Kim,Jongseol Lee 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.2
Micro-electromechanical system (MEMS) microphones are sound sensors that are widely used in modern mobile and Internet-of-Things devices. Their market share is rapidly increasing due to their small size, excellent performance characteristics, and low power consumption. However, studies have focused on improving module performance without any spatial considerations. Most voice recognition devices have a small internal chamber in which a sensor is installed. A chamber with an open hole serves as a resonator, which alters the MEMS microphone’s characteristics. The aim of this study is to improve voice quality by using a digital filter to compensate for the effect of the chamber. This will allow the identification of frequency-response compensation characteristics and the acquisition of base data that can be used for product design.
콘형 스피커와 평판형 스피커의 분할진동 패턴 특성 비교 분석
김현갑(Hyun-Kab Kim),김희식(Hie-Sik Kim),장달원(Dalwon Jang),이종설(Jongseol Lee),장세진(Sei-Jin Jang) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
Currently, break-up mode are important to the principal elements of the speakers, but the specific analysis is insufficient according to the shape of the diaphragm. In this paper, the characteristics of the split vibration pattern of the cone type sparker and the flat type speaker are compared and analyzed. Based on the measurement of the displacement of the diaphragm using laser, we derive the difference between the directivity and thermal characteristics of the vibration mode and the slim speaker. Based on this, it can be grasped how the different structural characteristics of the cone type speaker and the flat type speaker are revealed, and it is expected to be utilized as the base data in the initial design of the diaphragm.