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Sun-youp Park,Jin Choi1,Jung Hyun Jo,Ju Young Son,Yung-Sik Park,Hong-Suh Yim,Hong-Suh Yim,Hong-Kyu Moon,Young-Ho Bae,Jang-Hyun Park 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.3
An algorithm to automatically extract coordinate and time information from optical observation data of geostationary orbit satellites (GEO satellites) or geosynchronous orbit satellites (GOS satellites) is developed. The optical wide-field patrol system is capable of automatic observation using a pre-arranged schedule. Therefore, if this type of automatic analysis algorithm is available, daily unmanned monitoring of GEO satellites can be possible. For data acquisition for development, the COMS1 satellite was observed with 1-s exposure time and 1-m interval. The images were grouped and processed in terms of “action”, and each action was composed of six or nine successive images. First, a reference image with the best quality in one action was selected. Next, the rest of the images in the action were geometrically transformed to fit in the horizontal coordinate system (expressed in azimuthal angle and elevation) of the reference image. Then, these images were median-combined to retain only the possible non-moving GEO candidates. By reverting the coordinate transformation of the positions of these GEO satellite candidates, the final coordinates could be calculated.
Choi, Jin,Jo, Jung Hyun,Yim, Hong-Suh,Choi, Young-Jun,Son, Ju-Young,Park, Sun-youp,Bae, Young-Ho,Roh, Dong-Goo,Cho, Sungki The Korean Space Science Society 2015 Journal of Astronomy and Space Sciences Vol.32 No.3
A strategy is needed for a regional survey of geosynchronous orbits (GSOs) to monitor known space objects and detect uncataloged space objects. On the basis of the Inter-Agency Debris Committee's recommendation regarding the protected region of geosynchronous Earth orbit (GEO), target satellites with perigee and apogee of $GEO{\pm}200km$ and various inclinations are selected for analysis. The status of the GSO region was analyzed using the satellite distribution based on the orbital characteristics in publicly available two-line element data. Natural perturbation effects cause inactive satellites to drift to two stable longitudinal points. Active satellites usually maintain the designed positions as a result of regular or irregular maneuver operations against their natural drift. To analyze the detection rate of a single optical telescope, 152 out of 412 active satellites and 135 out of 288 inactive satellites in the GSO region were selected on the basis of their visibility at the observation site in Daejeon, Korea. By using various vertical view ranges and various numbers of observations of the GSO region, the detection efficiencies were analyzed for a single night, and the numbers of follow-up observations were determined. The orbital estimation accuracies were also checked using the arc length and number of observed data points to maintain the GSO satellite catalog.
Choi, Se-Joon,Kim, Ki-Jung,Choi, Hyeong-Seok,Kim, Seong-Yun,Yim, Dong-Seok,Cho, Young-Jin,Hahn, Sang-June,Sung, Ki-Wug The Korean Society of Pharmacology 2006 The Korean Journal of Physiology & Pharmacology Vol.10 No.6
The effects of ethanol on corticostriatal synaptic transmission were examined, using extracellular recording and analysis of population spike amplitudes in rat brain slices, to study how acute ethanol intoxication impairs striatal function. Ethanol caused a decrease in population spike amplitudes in a dose dependent manner ($50{\sim}200mM$). Pretreatment with picrotoxin, a ${\gamma}-amino$ butyric acid $(GABA)_{A}$ receptor antagonist, increased the population spikes but ethanol (100 mM) was still effective in decreasing the population spikes under this condition. In the presence of $_{(DL)}-2-amino-5-phosphonovaleric$ acid (APV), N-methyl-D-aspartate (NMDA) receptor antagonist, the inhibitory action of ethanol on population spikes was not shown. These results suggest that ethanol inhibits the glutamatergic corticostriatal synaptic transmission through blockade of NMDA receptors.
Anxiolytic and Antidepressant Activities of Ginsenoside Rb1
Choi, Jong-Hyun,Yoon, Seo-Young,Choi, Eun-Joo,Ryu, Yim-Seon,Ko, Hong-Sook,Yim, Dong-Sool,Her, Youl,Lee, Yong-Soo,Song, Mi-Ryoung,Cheong, Jae-Hoon The Korean Society of Applied Pharmacology 2007 Biomolecules & Therapeutics(구 응용약물학회지) Vol. No.
The psychopharmacological profile of ginsenosides has not yet been confirmed systematically although various neuropharmacological activities associated with them have been investigated. In the present study, the psychological activities of Rb1 were investigated to evaluate whether it can be used in treatment or prevention of psychological disorders. Rb1 was intravenously injected at doses of O.2,2,5 and 10 mg/kg. The effects of Rb1 on the $Cl^-$ ion influx were investigated using IMR-32 human neuroblastoma cells. Moreover, locomotor activity, forced swimming activity, activity on rotating rod and activity in elevated plus-maze were tested in mice. Rb1 increased the $Cl^-$ influx into the intracell region in a dose-dependent manner. Rb1 did not cause change in behavior in total open field when locomotor activity was tested, however it increased activities, especially, such as rearing frequency in center area. Administration of Rb1 at 0.2 mg/kg significantly reduced activities on rotating rod however administration at high dosages had no effect on them. Rb1 administration decreased animal immobile time in a water chamber in a dose dependent manner, and increased the strong mobile time of animals. In conclusion, the present results demonstrate that Rb1 contributes to the psychopharmacological effects of ginseng and may be used in treatment or prevention of psychological disorders such as anxiety or depression.
Yim, K.J.,Kim, B.Y.,Lee, H.W.,Song, H.S.,Nam, Y.D.,Choi, J.S.,Choi, H.J.,Seo, M.J.,Yoon, C.,Kim, K.N.,Kim, D.,Rhee, J.K.,Roh, S.W. Elsevier Publishing Services 2014 MARINE GENOMICS Vol.18 No.2
Halococcus sediminicola CBA1101<SUP>T</SUP> (=CECT 8275<SUP>T</SUP>, JCM 18965<SUP>T</SUP>) is an extremely halophilic strain isolated from a marine sediment collected from the bay of Gangjin in the Republic of Korea. We found that the draft genome of H. sediminicola CBA1101<SUP>T</SUP> contains 3,764,367bp, with 62.3% G+C content. This is the one of the few genomes to be sequenced in the genus Halococcus.
Yim, Sreymom,You, Byoung Hoon,Chae, Hee-Sung,Chin, Young-Won,Kim, Hojun,Choi, Han Seok,Choi, Young Hee Taylor & Francis 2017 Xenobiotica Vol.47 No.11
<P>4. Thus in rats, intervention of SB on transporter-mediated metformin transportation partially improves glucose tolerance without hypoglycemia and increases hepatic distribution of metformin. Also the further investigations in humans are required to clarify the relevance of these findings to the clinical significance.</P>