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위성항법장치의 재밍대응 성능향상 검증을 위한 관성항법장치 모의 장치 설계
정준우,박성열,안병선,강행익,김갑진,박영범,Jung, Junwoo,Park, Sungyeol,Ahn, Byoung-Sun,Kang, Haeng-Ik,Kim, Kap Jin,Park, Youngbum 한국항행학회 2017 韓國航行學會論文誌 Vol.21 No.4
We propose the design of an INS simulated equipment to evaluate the enhanced jamming resistance of an INS-aided GPS receiver with INS, when a jamming signal is injected into a simulated high dynamic platform. We propose the design of a relative cheap INS simulated equipment, instead of an expensive INS simulator connected to GPS simulators. Based on the design, we implement the equipment and setup high dynamic test environment using the equipment to evaluate an INS-aided GPS receiver. In the GPS L1 C/A and L2C simulations that inject jamming signals of the narrow and wide bandwidth into the GPS receiver with and without INS-aided algorithm, we obtain increased jamming resistance performance as +5 dB compared with the GPS receiver without INS-aided algorithm in all kinds of jamming bandwidth. Based on the simulations, we verified that the INS simulated equipment can be used to evaluate the enhanced jamming resistance of INS-aided GPS receivers. 본 논문에서는 위성항법장치와 관성항법장치가 장착된 항체의 고속 이동을 모의하는 환경에서 재밍신호가 인가되었을 때, INS-aided 알고리즘이 장착된 위성항법장치의 재밍대응 성능향상을 검증하기 위한 관성항법장치 모의 장치의 설계 방안을 제시한다. 위성항법 시뮬레이터와 연동하여 관성데이터를 제공할 수 있는 고가의 관성항법장치 시뮬레이터를 대체하기 위해 상대적으로 낮은 가격으로 제작할 수 있는 관성항법장치 모의 장치 설계 방안을 제시하였다. 제안한 설계를 기반하여 제작한 모의 장치를 이용하여 INS-aided 알고리즘이 장착된 위성항법장치의 재밍대응 성능을 검증하기 위해 항체의 고속 이동 환경을 모의한 시험 환경을 구축하였다. 모의 시험을 통해 GPS L1 C/A와 L2C 항법신호에 인가되는 협대역/광대역의 재밍신호에 대응하여 INS-aided 알고리즘 미적용 시와 대비하여 기존 문헌에서 분석한 +5 dB의 재밍대응 성능 향상이 가능함을 확인하였다. 모의 시험 결과를 통해 본 논문에서 설계하여 제작한 관성항법장치 모의 장치가 재밍대응 성능향상 검증을 위한 관성데이터 주입이 가능함을 검증할 수 있었다.
정준우(Jun Woo Jung),유승범(Seungbum Ryoo),최은경(Eun Kyung Choe),박규주(Kyu Joo Park) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.5
Purpose: The incidence of hernia is estimated to be 3~5% in the general population. In patients on continuous ambulatory peritoneal dialysis (CAPD), the incidence of hernia is 6~25% and immediate surgical treatment is critical to maintain CAPD. This study was performed to identify clinical characteristics of hernias in CAPD patients and evaluate the surgical results. Methods: We retrospectively analyzed 13 prospectively registered patients (male : female=12:1) on CAPD treated with hernia between March 1998 and June 2008 at the Seoul National University Hospital by one surgeon. Perioperatively, patients underwent intermittent hemodialysis via internal jugular catheter indwelled just before the operation. Peritoneal dialysis was resumed between 2 weeks and 2 months after operation. Results: Mean age was 46.6 years (range: 19~71 years). Fifteen hernias developed in 13 patients, of which, 10 (67%) were inguinal and 5 (33%), umbilical. Mean duration from CAPD start to onset of hernia was 31.4 months (range: 0~129 months). All inguinal hernia patients received standard McVay operation, 3 patients with umbilical hernia were repaired with primary herniorrhaphy and 1 patient with large fascial defect needed mesh implant. During mean follow-up periods of 31 months, recurrence was detected in 1 patient in umbilical hernia group. The only complication related to operation was wound hematoma in one patient. Two patients were converted to hemodialysis after operation because of low compliance to peritoneal dialysis in one patient and suspected catheter-related infection in the other. Conclusion: Our results indicate that hernia repair can be safely performed with acceptable outcomes in patients on CAPD.
DRGEP 방법에서의 표적 화학종 변화가 메커니즘 축소에 미치는 영향
정준우(Jun Woo Jung),임영찬(Young Chan Lim),서현규(Hyun Kyu Suh) 한국연소학회 2019 한국연소학회지 Vol.24 No.3
This study investigated the effect of target species changing on the mechanism reduction in DRGEP(Directed Relation Graph Error Propagation) method. To achieve this goal, the automatic mechanism reduction scheme of reaction workbench which includes DRGEP method was introduced and the 0-D combustion analysis of CHEMKIN-PRO was executed to confirm the error rate of ignition delay between the detailed mechanism and reduced mechanisms. To consider various target species, the skeletal mechanism for biodiesel and n-heptane mechanism were merged and the various environments were considered to decide the environment of the mechanism reduction by changing the relative and absolute tolerance associated with the mechanism reduction. As a result, it was confirmed that the target species has a great influence on the reduction of the mechanism, and it was appropriate to consider chemical species, as the target species, associated with exhaust emissions.
분위기 조건에 따른 바이오디젤의 NOx 생성 특성 및 상세화학반응 경로 연구
정준우(Jun Woo Jung),임영찬(Young Chan Lim),서현규(Hyun Kyu Suh) 한국연소학회 2018 한국연소학회지 Vol.23 No.2
This paper was performed to investigate the effect of various ambient conditions on the biodiesel NOx formation characteristics. To achieve this, a closed homogeneous batch reactor model of CHEMKIN-PRO was used for the biodiesel combustion analysis and, surrogate fuels for the biodiesel combustion was consisted of n-heptane, methyl decanoate and methyl-9-decenoate. As a result of analysis, NOx production increases with increase of ambient temperature and pressure, and NOx production was the highest at Φ=0.7 of equivalence ratio condition. However, after the Φ=0.7 of equivalence ratio condition, it was confirmed that the decrease in NOX formation was caused by the lack of oxygen as the equivalence ratio was increased. In the biodiesel combustion, the main chemical reactions of NOx production is dominated by the thermal mechanism, and other NOx production is generated by the reaction mechanisms including N₂O mechanism and HO₂ radical.