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표적 식별 성능 향상을 위한 EMD를 이용한 HRRP의 잡음 제거 기법
박준용(Joon-Yong Park),이승재(Seung-Jae Lee),양은정(Eunjung Yang),김경태(Kyung-Tae Kim) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.4
본 논문에서는 레이다 표적식별 성능을 향상시키기 위하여 고해상도 거리측면도(High Resolution Range Profile: HRRP)에 포함된 잡음을 효과적으로 제거하는 방법을 제안한다. 제안된 기법은 HRRP에 포함된 잡음의 통계적인 특성과 EMD (Empirical Mode Decomposition) 알고리즘을 이용하여 HRRP에 포함된 잡음을 효과적으로 제거한다. 잡음 제거 실험 결과에서는, 본 논문에서 제안한 기법이 잡음을 효과적으로 제거하면서, 표적 식별 성능을 크게 향상시키는 것을 수치적으로 확인할 수 있었다. In this paper, we propose an efficient method to remove noise component contained in high resolution range profile(HRRP) to improve target identification performance. The proposed method can effectively eliminate the noise component using both the statistical characteristics of the noise component and EMD algorithm. Experimental results show that the proposed method can substantially improve the identification capability, removing the noise component effectively.
감염증에서 위점막의 Toll-like Receptor 4 발현
박준용 ( Joon Yong Park ),한동수 ( Dong Soo Han ),김보현 ( Bo Hyun Kim ),강은경 ( Eun Kyung Kang ),이영춘 ( Ying Chun Li ),이항락 ( Hang Lak Lee ),김진배 ( Jin Bae Kim ),손주현 ( Joo Hyun Sohn ),최호순 ( Ho Soon Choi ),강정옥 ( Ju 대한소화기학회 2003 대한소화기학회지 Vol.41 No.3
Background/Aims: Toll-like receptors (TLRs) represent a pattern recognition receptors with an ability of specific recognition of pathogens. TLRs appear to respond to pathogens and induce NF- kB activation. TLR2 and 4 seem to be related to the initiation of immune response against gram negative and positive bacteria. We investigated the effect of Helicobacter pylori (H. pylori) infection on the expression of TLRs on the gastric mucosa. Methods: For 35 endoscopic gastric mucosa samples, histologic grading of H. pylori infection and inflammatory cell infiltration were performed. The mRNA expression of TLR2, 3, and 4 was examined by RT-PCR. Immunohistochemistry demonstrated the distribution of TLR2 and 4 in gastric mucosal biopsies. Results: H. pylori positive gastric mucosa expressed higher TLR4/GAPDH ratio than H. pylori negative gastric mucosa (p=0.035), while no significant difference in the expression of TLR2 and 3 was detected (p=0.129, p=0.176). The severity of neutrophil infiltration showed a significant positive correlation with TLR4/GAPDH ratio (p=0.045, r=0.342). Immunohistochemistry using anti-TLR4 and anti-TLR2 antibody revealed the expression of TLR4 in the epithelial cells of H. pylori-infected gastric mucosa. Conclusions: H. pylori infection induces TLR4 expression in the human gastric epithelium, which suggests a certain role of TLR4 in the mucosal inflammatory reaction to H. pylori infection. (Korean J Gastroenterol 2003;41:171-176)
국내 이용량 기반 요금제 도입을 위한 선결 정책 과제: 국내 통신 시장 특성을 고려한 허용 기준을 중심으로
박준용 ( Joon Yong Park ),신민수 ( Min Soo Shin ) 정보통신정책학회 2012 정보통신정책연구 Vol.19 No.3
인터넷 서비스 요금 제도에 대한 논란은 초고속 인터넷이 도입된 이후로 계속 있어왔으나, 어느 한쪽으로 결론이 나지 않은 채 정액 요금제를 사용해 왔다. 정액 요금제와 비교하여 이용량 기반 요금제는 인터넷 사용이 제한될 수 있다는 점과 인터넷 사용 비용의 증가 가능성, 기존 인터넷 비즈니스 모델의 새로운 구축 등 도입에 대한 논란이 존재한다. 요금제 도입에 대한 논란을 종식시키고 어떤 형식의 과금 체계가 적절한지를 알기 위해서는, 우선 이용량 기반 요금제 도입에 있어 국내 허용 기준을 정립하는 것이 필요하다. 해외 사례만을 참고하여 요금 정책을 논의하기 보다는, 국내 통신 시장 상황을 고려한 허용 기준을 논의하는 것이 정책 수립과 국가 발전에 도움이 될 것이다. 본 연구에서는 이용량 기반 요금제의 도입을 위한 허용 기준을 정립하기 위해, 국내 소비자들이 이용량 기반 요금제 도입 시 중요하게 고려할 수 있는 요인들을 도출하였고, 그러한 요인들의 조합에 대한 소비자들의 반응이 어떠한지를 살펴보았다. 분석 결과 나타난 소비자 집단 별 차이는 향후 정책 수립과 사용자 별 이용량 기반 요금제 상품에 대한 기준을 제시할 때 근거자료로 삼을 수 있을 것으로 판단된다. There has been long dispute on Internet service rate system since high-speed Internet was introduced. Without clear conclusion, the flat rate tariff has been adopted. Comparing with flat rate tariff, usage-based billing may limit the use of Internet, increased expense for the use of Internet, the need for development of new Internet business model. So there has been some criticism on usage-based billing. To put an end to the long dispute and understand which sort of billing system is adopted, it needs to establish appropriate domestic introduction criteria for usage-based billing. It would be better to develop domestic policy considering domestic telecommunications business environment rather than only referring to overseas cases. This study analyzes criteria for adopting usage-based billing such as price, amount, speed which would be critical for Korean consumers, The finding on the different preferences on price, amount, speed of consumer groups may help policy makers and contribute toward developing data on the billing system for individual consumers.
박준용(Joon Yong Park),한동수(Dong Soo Han),윤병철(Byung Chul Yoon),이오영(Oh Young Lee),손주현(Joo Hun Sohn),함준수(Joon Soo Hahm),박경근(Kyung Geun Park),김정현(Jeogn Hyun Kim),이민호(Min Ho Lee),기춘석(Choon Suhk Kee),박경남(Kyung 대한소화기학회 1995 대한소화기학회지 Vol.27 No.4
N/A Background/Aims: Diabetes mellitus is thought to be a risk factor for gallstone diseases, esopecially cholesterol stone. The risk of cholelithiasis among diabetic persons cou]d be due to several mechanisms, including impaired gallbladder motility and hyperinsulinemia. We investigated the relationship of gallstones in the diabetic patients and analyzed their clinical course and related factors. Methods: A collective review of ] 1,302 diabetic patients from January l979 to December 1993 were carried out at Hanyang University Hospital. Of the 323 cases with gallstones, 180 cases were evaluated for age, body mass index, duration of disease, HbAlc, fasting blood sugar, AST/ALT, cholesterol level and triglyceride level. Results: The prevalence of gallstones in the diabetics studied was 2.86%. The composition of gallstones was not related to age, and pigmented stones were most commonly observed. The incidence c>f cholecystectomy was 0.27% in men, and 0.47% in women. Conclusions: The prevalence of gallstones in diabetic patients was higher than in the normal population, which could be explained by the decreased mcotility of the gallbladder or obesity. No significant difference was found in age, body mass index, cholesterol level, and triglyceride level when compared to patients with or without gallstones. (Korean J Gastroenterol 1995;27:433 - 440)