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양방향 10MDSL을 위한 VDSL 시스템의 주파수할당 계획
길정수(Kil Jung Su),권호열(Kwon Ho Yeol) 강원대학교 산업기술연구소 2002 産業技術硏究 Vol.22 No.1
In this paper, we discussed an effective VDSL frequency plan for symmetric 10MDSL service. The frequency plan 998 and plan 997 for asymmetric VDSL services have been not optimally designed for 10MDSL services. To obtain the reaches and data rates of 10MDSL, we proposed two frequency allocation schemes : Static method and dynamic method. We can select frequency bands with their fixed boundaries in static method while with their variable boundaries in dynamic method. To show the effectiveness of our proposed methods, we performed some simulations about plan 997 and plan 998, new static method, and new dynamic method. According to the simulation results, the proposed dynamic method can provide the best data rates and reaches for 10 Mbps symmetric VDSL services.
Heart Rate Variability 신호의 시간 및 주파수 영역 분석
길정수(Kil Jung Su),권호열(Kwon Ho Yeol) 강원대학교 산업기술연구소 2002 産業技術硏究 Vol.22 No.1
Autonomic nervous systems play an important role of keeping our health as balancing homeostasis. But the abnormality of these abilities makes our presence be feeble. To obtain these information of body which helps for us to decide whether one is healthy or not, based on the study of Heart Rate Variability. In this paper, we presented HRV model and its processing steps to extract some information of human body. After that, some experimental results are presented in time-domain and frequency-domain.