http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jin Choi,Jung Hyun Jo,Hong-Suh Yim,Young-Jun Choi,Ju-Young Son,Sun-youp Park,Young-Ho Bae,Dong-Goo Roh,Sungki Cho 한국우주과학회 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 ± 200 km 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.
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.
유두부종과 관계된 시력상실 5례 경험 : Report of 5 Cases
서영호,임만빈,이장철,손은익,김동원,김인홍 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.7
Five cases of complete visual loss related to papilledema were presented The diagnoses of cases were an intracranial arachnoid cyst( 1 case), brain tumors(3 cases) and benign intracranial hypertension(BIICP) followed by a minor head trauma(1 case). All cases had marked papilledema at admission and their range of age was from 4 to 27 years. The timings of visual loss were preadmission in 2 cases, during admission following removal of posterior fossa tumor(1 case) and revision of cystc-peritoneal shunt in a case of an arachnoid cyst(l case), and during follow-up after conservative management of a minor head trauma(BIICP) in 1. Their visual function had not improved during the follow-up from 3 months to 9 years. Optic nerve sheath decompression should be considered in the case of BIICP for improving the vision. In cases who have well developed chronic papilledema, visual loss that is abrupt may be followed by cranial decompression. We stress neurosurgeons should predict such a tragic outcome of visual loss during the management of cases who have well developed chronic papilledema, especially in children and young adult patients.