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차량 추적 시스템에서 차분기법을 이용한 정밀도 향상에 관한 연구
장경일,이원우,길계환,김용윤,황춘식 대한전자공학회 1997 電子工學會論文誌, S Vol.s34 No.1
This paper shows the development of the high accuracy vehicle positioning algorithm using the differential technique in vehicle tracking systems form the existing vehicle position which is acquired from the global positioning system (GPS). The control center receives the satellite ephemerise data and pseudorange correction from the reference station, and vehicle position from the moving vehicle. The pseudorange is calculated with the satellite position and the vehicle position, and corrected by pseudorange correction. Using this corrected pseudorange and kalman filter, more improved vehicle positioning data were obtained.
장경일,석문식,변상경,김윤배 한국해양과학기술원 2002 Ocean and Polar Research Vol.24 No.4
CTD data taken in the Ulleung Basin between 1996 and 2001 are analyzed to understand the hydrography around Dokdo. Major features occurring in the Ulleung Basin such as the path variability of the East Korean Warm Current (EKWC), the location and size of the Ulleung Warm Eddy (UWE), and the position of the Offshore Branch along the Japanese coast all influence the hydrography around Dokdo. The Dokdo area frequently lies in the eastern part of the meandering EKWC and the UWE that results in a tilting of isolines sloping upwards to Dokdo in the Ulleung Interplain Gap (UIG) between Ulleungdo and Dokdo. Subsurface water near Dokdo then becomes colder and less saline than water near Ulleungdo. Two cases that are opposite to this general trend are also identified when the Dokdo area is directly affected by the EKWC and by a small scale eddy fed by the Offshore Branch. High salinity cores and warm waters are then found near Dokdo with isolines sloping upwards to Ulleungdo. Freshening of the East Sea Intermediate Water was observed in the UIG when neither the EKWC nor the UWE was developed in the Ulleung Basin during June-November 2000.
장경일,김구,이석우,심태보,Chang, Kyung-Il,Kim, Kuh,Lee, Suk-Woo,Shim, Tae-Bo 한국해양학회 1995 韓國海洋學會誌 Vol.30 No.3
Two hydrographic surveys along with direct current measurements using drogues and moored current meters were conducted in Cheju Strait during April and May, 1983. The data clearly demonstrate that a branch of the Kuroshio characterized by high temperature and high salinity enters the Cheju Strait after turning around the western coast of Cheju-Do. The width of the current turning west of Cheju-Do is about 60 km and reduces to 20∼30 km in the strait, resulting in a high speed(>10 cm/s) at the western entrance and in the middle of the strait, compared with a low speed (>5 cm/s) west of Cheju-Do. The Tsushima Current water also originating from the Kuroshio shows its influence in the eastern part of the Cheju Strait. Thermohaline fronts formed between the warm current waters and the coastal waters suggest the southward extension of the Yellow Sea Coastal Water west of the Cheju Strait. A warming of the warm current waters occurs in May, while a cooling takes place in other areas. The major freshening and cooling of water take place in the middle of the Cheju Strait in May due to the intrusion of cold and low salinity water from the west of the Cheju Strait.
장경일,강창근,강동진 한국해양과학기술원 2010 Ocean and Polar Research Vol.32 No.3
Many countries has been interested in studying the East Sea to look ahead into the world oceans’ future, since the East Sea has been known as a miniature ocean. In this respect, PICES decided the East Asian Seas Time-series (EAST) studies, and the East Sea as the first subject (EAST-I). Since 2006 Ministry of Land, Transport & Maritime Affairs, Korea has supported the Korean EAST-I program. Through the Korean EAST-I program, 44 research papers were published in various scientific journals. This special issue contains 6 research articles including results from the interdisciplinary observation in the summer, 2008. Those articles cover the entire East Sea from the Korea Strait to the Japan Basin, and also cover the studies of the euphotic layer to the bottom sediment. MLTM and KIMST have provided full support to EAST-I program. KHOA carried out the joint cruises in the Ulleung Basin. Those are deeply appreciated. Finally, we would like to express our gratitude to the editorial board of Ocean & Polar Research.
차량추적을 위해 항법해 보정방법을 이용한 Inverted-DGPS 시스템 구현
장경일,김용윤 외1명 陸軍士官學校 1997 한국군사학논집 Vol.52 No.-
This paper shows the development of the high accuracy positioning of vehicle tracking system, which is acquired from the Global positioning System(GPS). For the accurate vehicle position, Inverted-DGPS(IDGPS) of navigation solution method is applied. The control center receives the vehicle position and satellite set for navigation solution from the moving vehicle. Then, the navigation solution correction is calculated with the satellite position using the moving vehicle's satellite set, and he position of reference station. Using the satellite position of moving vehicle and the navigation solution correction of reference station, more accurate positioning data were obtained.
돌발성 난청 환자에서 전신 스테로이드 단독요법과 고실 내 스테로이드 병용요법의 치료 효과 비교
장경일,임소연,전은주,이현진 대한이비인후과학회 2021 대한이비인후과학회지 두경부외과학 Vol.64 No.3
Background and Objectives Steroid treatment is used as a main treatment modality forsudden sensorineural hearing loss (SSNHL). Intratympanic injection of steroid (ITS) has beenused and its therapeutic efficacy reported as being comparable to the systemic steroid administration(SS). This study compares the hearing outcomes of using ITS and SS simultaneouslyand SS alone. Subjects and Method Retrospective chart review was performed for 146 patients withSSNHL. The patients were divided into 2 groups according to the method of treatment (SSand ITS simultaneously vs. SS alone). The inclusion criteria were starting treatment within 7days after onset, and follow up pure tone audiometry at least 4 weeks after treatment. Hearinggain for pure tone threshold of each frequency and average of 4 frequencies (500 Hz, 1000 Hz,2000 Hz, and 4000 Hz) were compared between both groups. Results The improvement in PTA at 1-month follow-up was 27.3±20.0 dB HL in the simultaneousgroup and 19.1±19.5 dB HL in the SS alone group; this was not statistically significant. Complete or partial recovery at 1-month follow-up was observed in 65.3% of the simultaneousgroup and 69.6% of the SS alone group; this was also not significant. Conclusion There was no significant difference in hearing outcomes between the simultaneousand SS alone group. The simultaneous therapy does not appear to be superior to the SS alonetherapy. Further studies using more population and longer follow-up periods are necessary.