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최태구,이대기,Choe, Tae-Gu,Lee, Dae-Gi 한국전자통신연구원 1983 전자통신 Vol.5 No.4
This paper presents some considerations of reliability for switching system, i. e. reliability measures, reliability model and prediction, and reliability improvement. Those are described comprehensively than technologies aspects. Recent trends for switching system reliability are also described so as to aid people interested in this field.
일시적 가상현실 운동게임이 선천성 심장병 소아 청소년들의 혈관기능에 미치는 영향
최태구 ( Tae Gu Choi ),김현정 ( Hyun Jeong Kim ),조민정 ( Min Jeong Cho ),김재엽 ( Jae Yeop Kim ),정용준 ( Yong Joon Jung ),제세영 ( Sae Young Jae ) 대한스포츠의학회 2023 대한스포츠의학회지 Vol.41 No.2
Purpose: Regular aerobic exercise improves exercise capacity and quality of life in children with congenital heart disease (CHD), but it remains unclear whether aerobic exercise would improve vascular function in children with CHD. We tested the hypothesis that acute bout of virtual reality (VR) exergame would improve vascular function in children with CHD. Methods: In a single-arm study, eight children (age, 9±1 years; five males) with CHD participated in VR exergame (30 minutes at 40% of heart rate reserve) using a stationary cycle ergometer with a head mount display. Endothelial function and arterial stiffness as surrogate markers of vascular function were assessed via reactive hyperemia index (RHI) and augmentation index (AIx) using peripheral arterial tonometry at baseline and 30 minutes after VR exergame. Results: Compared to baseline, VR exergame improved in RHI (1.08 [0.96-1.30] to 1.16 [1.09-1.36], p< 0.05) and natural log transformed RHI (0.07 [-0.04-0.26] to 0.15 [0.09-0.31], p< 0.05). However, no significant changes were observed for decrease AIx (-1.00 [-9.00-9.50] to -7.00 [-14.00-8.75], p=0.547) and AIx@75 (-6.50 [9.75-3.50] to -4.50 [-13.00-4.50], p=0.735) (all index values are reported as median [interquartile range]). Conclusion: These findings suggest that a single bout of VR exergame has the potential to improve vascular endothelial function in children with CHD.
단일모드 광섬유 접속용 광커넥터의 삽입손실 예측을 위한 Monte Carlo Simulation
최태구(TaeGu CHOY),고재상(JaeSang KOH),정명영(MyungYoung CHUNG),안승호(SeungHo AHN),전오곤(OhGone CHUN) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.2
본 논문에서는 단일모드 광섬유 접속용 광커넥터의 주요특성중에 하나인 삽입손실(Insertion Loss) 특성에 영향을 주는 측어긋남 비정렬요인(Lateral offset misalignment)을 야기하는 광커넥터 구성품의 동심차(Eccentricity)에 대해 확률변수(Random Vanable)를 정의하고 각 구성품들의 Random behavior에 따른 광커넥터의 삽입손실 예측을 위한 Monte Carlo Simulation을 수행하였다. 또한, 단일모드 광섬유 접속용 광커넥터의 삽입손실 목표치인 1dB를 만족하기 위한 각 구성품들의 허용오차 범위 도출에 본 Simulation을 활용하였다.
Effects of External PIM Sources on Antenna PIM Measurements
김진태,최태구,조인귀,MyungYungJeong 한국전자통신연구원 2002 ETRI Journal Vol.24 No.6
Antenna Passive Intermodulation (PIM) level measurement results are rarely credited to be due to external signal receiving characteristics of the antennas or serious effects from external PIM sources, such as the anechoic chamber absorber and antenna tower. This paper presents an antenna PIM model for a reflected PIM measurement method. Based on the findings of null point generation and the behavior of the third order PIM values obtained by theoretical predictions and experimental results, we concluded that the results of the antenna PIM level test were influenced by the external PIM sources generated by the anechoic chamber absorber and the path differences of PIM signals coming into the antenna.