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레일레이 채널에서 성능 향상을 위한 DVB-T용 비터비 디코더의 아키텍쳐
吳姃姸,朴奎鉉,李丞晙 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.11
This paper presents a novel Viterbi decoding architecture for European Digital Video Broadcasting (DVB) receiver. The channel sate information (CSI) of each sub-carrier is used to weight the bit-metric of each symbol. The weighted bit-metric is delivered to Viterbi decoder after going through the symbol deinterleaver and bit deinterleaver, such that the CSI can be correctly applied to corresponding bits even after the two interleavings. Simulation shows that the new architecture gives significant performance enhancement of 6∼13dB in Rayleigh fading channels depending on the modulation types. This results is also better than previous results by 3.7∼10.3dB. 본 논문은 유럽형 디지털 TV의 표준인 Digital Video Broadcasting(DVB) 수신기에 사용되는 비터비 디코더의 새로운 아키텍처를 제한하였다. OFDM system의 multiple carrier에서 각각의 sub-carrier에 Channel State Information(CSI)를 추정하여, 각 symbol의 bit-metric을 구할 때 가중치를 주는 방식으로 적용하였다. 가중치를 적용한 bit-metric은 심볼 디인터리버와 비트 디인터리버를 통과한 후에 비터비 디코더에 전달된다. 즉, CSI는 두개의 인터리버를 거친 후에도 그에 상응하는 비트에 정확히 적용될 수 있음을 말한다. 본 논문에서 제안한 새로운 아키텍쳐는 Rayleigh fading 채널에서 6~13dB의 상당한 성능의 향상을 보임을 변조 방식에 따라 시뮬레이션을 통해 보였다. 이 결과는 기존의 방식에 비하여 3.7~10.3dB 더 나은 성능이다.
성인 남녀의 부모애착과 이상섭식행동의 관계: 성별로 조절된 신체불만족의 매개효과
오정연,장유진 학습자중심교과교육학회 2025 학습자중심교과교육연구 Vol.25 No.5
목적 본 연구는 부모애착이 신체불만족을 매개로 이상섭식행동에 미치는 영향이 성별에 따라 다르게 조절됨을 확인하여 성인의 건강에 필요한 심리적 자원을 위한 기초자료를 제공하고자 한다. 방법 전국의 만 20~ 39세의 성인남녀 430명을 대상으로 자기 보고식 온라인 설문지를 작성 후 수립된 자료는 SPSS 21.0 및Mplus 7.0 프로그램을 이용하여 분석되었다. 매개효과 검증 3단계 절차를 적용하였고, Sobel Test를 활용하여 매개효과의 유의성을 확인하였다. 변인관계가 성별이 조절하는지를 검증하기 위하여 위계적 회귀분석을 실시하였고, 조절효과의 양상을 확인하기 위하여 단순 기울기 분석(Simple Slope Analysis)을 활용하였다. 조절된 매개효과를 검증하기 위하여 부트스트래핑(2,000회)을 적용해 간접효과의 유의성을 추정하고, 조절 변인의 수준에 따른 매개효과의 크기를 살펴보았다. 결과 첫째, 부모애착과 이상섭식행동간의 관계를 신체불만족이 부분 매개하는 것으로 나타났다. 둘째, 부모애착과 신체불만족 관계는 성별에 따라 달라지는 것으로 나타났다. 셋째, 부모애착이 신체불만족을 매개로 이상섭식행동에 미치는 영향이 성별에 따라 다르게 나타나, 조절된 매개효과가 유의미한 것으로 나타났다. 결론 이상의 결과를 종합하면 부모애착으로 인한 신체불만족이 이상섭식행동에 미치는 영향에 있어 남녀 간의 차이가 있으므로, 치료에 있어 성별에 따른 개입방식이 달라져야함을 알 수 있다. Objectives Through online survey, it has progressed a research activity for the effect of parent attachment on the abnormal eating behavior regulated by gender with meditation effect of body dissatisfaction. Methods As subject of research,it collects the data from 430 adults between 20- to 39-year-old men and women. After completing questionnaires for the parent attachment and body dissatisfaction, and the Korean table manner, it analyzes the data by SPAA 21.0 and Mplus 7.0 program. In relationship between the parent attachment and the abnormal eating behavior, the 3 verification stage steps of meditation effect is applied for mediation effect of body dissatisfaction, moreover, the meditation effect is revalidated by the Sobel test. Also, it conductsthe hier archical analysis to verify the gender regulation effect on relationship between the body dissatisfaction and abnor mal eating behavior and it conducts the simple slope analysis to verify the aspect of meditation effect. To verify the regulated meditationeffect, it applies the bootstrapping to estimate the significance of indirect effect and it considers the amount of meditation effect according to a level of moderating variable. Results First, it was found that body dissatisfaction partially mediated the relationship between parental attach ment and abnormal eating behavior. Second, the relationship between parental attachment and body dissat isfaction was found to vary according to gender. Third, the effect of parental attachment on abnormal eating be havior through body dissatisfaction was different according to gender, indicating that the controlled mediating ef fect was significant. Conclusions Combining the above results, it can be seen that there is a difference between men and women in the effect of body dissatisfaction due to parental attachment on abnormal eating behavior, so the intervention method according to gender should be different in treatment.
레일레이 채널에서 성능 향상을 위한 DVB-T용 비터비 디코더의 아키텍쳐
오정연,박규현,이승준,Oh, Jung-Youn,Park, Kyu-Hyun,Lee, Seung-Jun 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.6
본 논문은 유럽형 디지털 TV의 표준인 Digital Video Broadcasting(DVB) 수신기에 사용되는 비터비 디코더의 새로운 아키텍처를 제한하였다. OFDM system의 multiple carrier에서 각각의 sub-carrier에 Channel State Information(CSI)를 추정하여, 각 symbol의 bit-metric을 구할 때 가중치를 주는 방식으로 적용하였다. 가중치를 적용한 bit-metric은 심볼 디인터리버와 비트 디인터리버를 통과한 후에 비터비 디코더에 전달된다. 즉, CSI는 두개의 인터리버를 거친 후에도 그에 상응하는 비트에 정확히 적용될 수 있음을 말한다. 본 논문에서 제안한 새로운 아키텍쳐는 Rayleigh fading 채널에서 6~13dB의 상당한 성능의 향상을 보임을 변조 방식에 따라 시뮬레이션을 통해 보였다. 이 결과는 기존의 방식에 비하여 3.7~10.3dB 더 나은 성능이다. This paper presents a novel Viterbi decoding architecture for European Digital Video Broadcasting (DVB) receiver. The channel sate information (CSI) of each sub carrier is used to weight the bit-metric of each symbol. The weighted bit-metric is delivered to Viterbi decoder after going through the symbol deinterleaver and bit deinterleaver, such that the CSI can be correctly applied to corresponding bits even after the two interleavings. Simulation shows that the new architecture gives significant performance enhancement of 6~13dB in Rayleigh fading channels depending on the modulation types. This results is also better than previous results by 3.7~10.3dB.
영지버섯 생장점 단백다당체 GLB-A, GLB-B의 항암효과 및 면역 활성에 관한 유세포 분석학적 연구
오정연,정경수 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-
In the previous study we described the antitumor effect of GLB, a protein-polysaccharide fraction separated from the growing tips of Ganoderma lucidum, against sarcoma 180 solid tumor in ICR mice. In this study, we separated an acidic protein-polysaccharide fraction. GLB-A, and a basic protein-polysaccharide fraction. GLB-B, from GLB by differential precipitation, and elucidated their antitumor and immunomodulatory activities. When ip injected at the dose of 50 ㎎/㎏/day into the ICR mice. GLB-A and GLB-B inhibited the growth of ip implantated sarcoma 180 cells by 32.4% and 21.0%, respectively. Of these, GLB-A increased the % lymphoblast in the spleen of the tumor-bearing and the mormal mice by 20.9% and 123.0%, and the CD4/CD8 ratio by 73.3% and 22.4%, respectively. GLB-A also increased the expression of CD25 (IL-2 receptor α chain) in normal mice by 82.0%. These results strongly suggest that GLB-A is a promising candidate for antiumor immunomodulatory medicine.
영지버섯 생장점 단백다당체 GLB의 대식세포 활성화 효과
오정연,조경주,정수현,김진향,Lillehoj, H.S.,정경수 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-
In the previous study we described the antitumor activity of GLB. a protein-polysaccharide fraction of the growing tips of Ganoderma lucidum, against sarcoma 180 solid tumor in ICR mice. In this study we investigated the stimulatory activity of GLB on macrophages. When analyzed using a flow cytometer. GLB (100 ㎍/㎖) was found to increase the phagocytic activity of the BALB/c mouse peritoneal macrophages as well as chicken macrophage BM2CL cells against FTTC-labeled C. albicans by 55.2% and 21.2%, respectively. GLB also increased the spreading and the expression of MHC class Ⅱ molecules of BM2CL cells as well as the mouse peritoneal macrophages. From these results, it is clear that GLB is a strong stimulator to the macrophages.
鎔接殘留應力이 應力比에 따라 疲勞龜裂傳播에 미치는 影響
表東根,李龍福,金鍾鉉,吳湞淵 弘益大學校 1989 弘大論叢 Vol.21 No.2
To examine the effects of the welding residual stress on Mode I fatigue crack propagation behavior, 3mm thickness SS41 steel plate was welded by an Auto-matic Submerged Arc Welding. Initial residual stress and relaxation residual stresses according to each stress ratio were measured. The fatigue crack propagation behavior from the region of compressive residual stress to region of tensile residual stress was analyzed. The results predicted by the Forman's equation using the superposition approach of the respective stress intensity factors for the initial residual stress and for the applied stress according to each stress ratio were compared with experimental data. The validity of the superposition approach was investigated. The conclusion are summerized as follows: 1. When the component is subjected to a constant amplitude cyclic tensile loading, the welding residual stress is reduced as stress ratio increase. 2. As the fatigue crack is propagation through the compressive residual stress field, it was found that the effects of welding compressive residual stress on fatigue crack growth in weldments, and the stress ratio decreases, become larger and delay the fatigue crack growth rate. 3. For negative values of the effective stress ratio, R? in the welding compressive residual stress field, the prediction of fatigue crack growth rate by the Forman's equation were found to be corresponded to experimental data for stress ratio R?0.3, as the effective stress ratio R? approached zero, when the stress ratio R>0.3 the prediction of the fatigue crack growth rate by Forman's equation were found to be impossible.