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이중모드로 동작하는 개선된 Sign-Godard 자력 등화기
조현돈,장태정 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-
Adaptive blind equalizer has gained wide-spread use in communication receivers that operate without training signals. In this paper, in order to reduce the residual error and speed up the convergence process simultaneously, we propose a new blind equalizer operating on dual mode which has decision regions. Therefore, it has both a good initial convergence of the Sign-Godard algorithm and a low residual error of the radius-directed algorithm after converging. High order statistics are used for blind phase recovery and for avoiding local minima. Simulation results show that the new algorithm has a faster convergence rate in comparison to conventional algorithms. In additon, it has a lower residual error than that of conventional algorithms.
이중모드로 동작하는 개선된 Sign-Godard 자력 등화기
조현돈,장태정,Cho, Hyun-Don,Jang, Tae-Jeong 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.9C
In this paper, a new blind equalizer algorithm is proposed which operates on dual mode and combines the benefits of both the Sign-Godard algorithm and the radius-directed algorithm The proposed algorithm has both the properties of good initial convergence of the Sign-Godard algorithm and low residual errors after convergence of the radius-directed algorith High order statistics are used for blind phase recovery and gor avoiding local minima. Simulation results show that the new algorithm has not only faster convergence rated but also lower residual errors than those of the conventional algorithms. 본 논문에서는 이중 모드로 동작하면서 기존의 Sign-Godard 알고리듬과 반경지향 알고리듬의 장점을 결합하는 새로운 자력 등화 알고리듬을 제안한다. 제안한 알고리듬은 Sign-Godard 알고리듬의 좋은 초기 수렴성과 반경지향 알고리듬의 수렴 후 작은 잔류오차 특성을 동시에 가진다. 국부 수렴 현상과 위상차는 고차 통계치를 이용하여 보정하였다. 시뮬레이션 결과 제안한 알고리듬은 기존의 알고리듬보다 빠른 수렴 속도와 더불어 수렴 후에 남아 있는 잔류 오차가 작은 좋은 특징을 보여 준다.
이원돈(WD Lee),김규현(KH Kim),이성구(SG Lee),이혜경(HK Lee),조현진(HJ Cho),김은영(EY Kim),윤혜균(HG Yoon),박세필(SP Park),윤산현(SH Yoon),임진호(JH Lim) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.2
The objective of this study is to present our experiences about co-cultured blastocyst transfer in in vitro fertilization and embryo transfer(IVF-ET)and to assess the pregnancy and implantation rate. In preliminary study, from December 1994 to March 1995, in 274 IVF cycles, two or three 8 cell-embryos were transferred on day 3 after ovum pick-up(OPU) while the remaining embryos were further cultured for 48∼ 72 hours using cumulus cell co-culture. On day 5 or day 6, one or two blastocysts were transferred again, so maximum number of embryos transferred was 4(sequential ET). More over from April 1995 to June 1995, we performed 3 day ET or 5 day ET if more than 4 good embryos were available on day 2(selective blastocyst transfer). In this case, maximum number of embrgos transferred was 5 in 3 day ET and 3 in 5 day ET, respectively. The pregnancy and implantation rate between 120 ETs performed on 3 day and 192 ETs on 5 days was analyzed. In sequential ET group, the percentage of blastocyst obtained was 48.3%. The clinical pregnancy rate and implantation rate was 44.5%(122/274)and 16.4%(170/1034), respectively. In selective blastocyst transfer group, on day 3 after OPU, 46 pregnancies per 120 ET(38.3%)and on day 5, 103 pregnancies per 192 ET(53.6%)were achieved(p < 0.01). There was no significant difference in the ongoing pregnancy rate between day 3 ET and day 5 ET: 33.3%(40/ 120)and 39.6%(76/192), respectively. The multiple pregnancy rate was 50%(20/40)and 57.9 %(44/76), respectively, but, triplet pregnancy rate was 27.5%(11/40)and 13.2%(10/76), respectively. The results suggest that blastocyst transfer allows good pregnancy rate and implantation rate. Further research is required about blastocyst grading and we may consider one or two blastocyst transfer, minimizing the incidence of multiple pregnancy.
XRD 분석을 이용한 고온가열 무기계 내화 접착제의 성분검토
조현서 ( Cho Hyeon-seo ),지우람 ( Ji Woo-ram ),신기돈 ( Shin Ki-don ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
The structure of the RC structure is actively reinforcing the structure of the building which has suffered from aging, artificial and natural damage of the building. Among various reinforcement methods, epoxy adhesive is used to attach FRP in FRP reinforcement method which is reinforcing by attaching FRP to the structural part. At this time, the epoxy adhesive having a low critical temperature has a sudden adhesive failure upon exposure to heat, and thus, the development of an inorganic fireproof adhesive having a high critical temperature has progressed. Therefore, in this study, the compositional change of inorganic fire - resistant adhesive exposed to high temperature heat was analyzed by XRD.