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PLC 성능 향상을 위한 이산 웨이블렛 변환을 기반으로 한 임펄스 잡음 제거
유정화(Jeonghwa Yoo),이지송(Jisong Lee),송한별(Hanbyeol Song),최상호(Sangho Choe) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, we implement an impulse noise removal scheme for OFDM PLC using discrete wavelet transforms (DWT). We use the Bernoulli Gaussian (BG) model for impulse noise generation and employ the Galli model for the statistical PLC multipath channel that is a modified version of Zimmermann model. In this paper, we assume that channel parameters estimation is perfect.
Seo, Jeonghwa,Choi, Hak-Kyu,Jeong, Uh-Cheul,Lee, Dong Kun,Rhee, Shin Hyung,Jung, Chul-Min,Yoo, Jaehoon The Society of Naval Architects of Korea 2016 International Journal of Naval Architecture and Oc Vol.8 No.5
The resistance and seakeeping performance of a high-speed monohull vessel were investigated through a series of model tests in a towing tank. The hull had a slender wave-piercing bow, round bilge, and small deadrise angle on stern. Tests on the bare hull in calm water were first conducted and tests on spray rails followed. The spray rails were designed to control the flow direction and induce a hydrodynamic lift force on the hull bottom to reduce trim angle and increase rise of the hull. The maximum trim of the bare hull was $4.65^{\circ}$ at the designed speed, but the spray rails at optimum location reduced trim by $0.97^{\circ}$. The ship motion in head seas was examined after the calm water tests. Attaching the rails on the optimum location effectively reduced the pitch and heave motion responses. The vertical acceleration at the fore perpendicular reduced by 11.3%. The effective power in full scale was extrapolated from the model test results and it was revealed that the spray rails did not have any negative effects on the resistance performance of the hull, while they effectively stabilized the vessel in calm water and waves.
Dae Kyung Sohn,Il Won Shin,Jeonghwa Yeon,Jin Yoo,Byung Chang Kim,Bun Kim,Chang Won Hong,Kyung Su Han 대한외과학회 2019 Annals of Surgical Treatment and Research(ASRT) Vol.97 No.6
Purpose: This study aimed to validate an automated calculating system developed for determining the adenoma detection rate (ADR). Methods: To calculate the automated ADR, the data linking processes were as follows: (1) matching the selected colonoscopy results with the pathological results, (2) matching the polyp number from colonoscopy with that from pathology and confirming the histopathological results of each colonic polyp, and (3) confirming the histopathological results, especially the adenoma status of each colonic polyp. To verify the accuracy of the automated ADR calculating system, we manually calculated the ADR for 3 months through medical record review. Accuracy was calculated by measuring the error rate for each value. The cause of error was analyzed by additional order and chart review. Results: After excluding 318 cases, 2,543 patients (1,351 men and 1,192 women; median age, 57.9 years) who underwent colonoscopy were included in this study. When the automated calculating system was used, polyps were found in 1,336 cases (52.6%) and adenomas were found in 1,003 cases (39.4%). When the manual calculating system was used, polyps were found in 1,327 cases (52.2%) and adenomas were found in 1,003 cases (39.4%). The accuracies of the polyp detection rate and ADR according to the automated calculating system were 99.3% and 100%, respectively. Conclusion: We developed a system to automatically calculate the ADR by extracting hospital electronic medical record results and verified that it provided satisfactory results. It may help to improve colonoscopy quality.