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백광현,박위상 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
The coupling coefficient between two parallel optical fibers for a 3 dB coupler is derived using the coupled mode theory. A numerical example is treated to evaluate the coupling length and distance between the fibers.
유산소 운동과 복합 운동 프로그램이 비만 중년 여성의 건강 관련 체력에 미치는 영향
권기욱,백광현 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.6
In this research fourteen obese middle-aged women were divided into two groups of Aerobic & Combined Training. After twelve weeks of training, the effects on the body composition, plasma lipids, and strength conditioning of the subjects were evaluated. The results of this study were as follows: 1. While the group of aerobic exercise showed the tendency to decrease in the areas of weight, fat weight and lean body mass, the other group showed the tendency to increase in all the areas. 2. Whereas there wasn't any significant change for the group of aerobic exercise in the fitness factors such as power(sargent jump), muscular endurance(push-ups, sit-ups), agility (side-step, reflex movement), balance(stork stand), flexibility (bend over reach, back- stretch), the group of combined exercise showed significant increase in all the areas. 3. In an isokinetic strength test, the group of aerobic exercise showed the tendency to increase in quadriceps, but tended to decrease in hamstrings. However, the group of combined exercise significantly increased in quadriceps and tended to increase in hamstrings. 4. For the density of plasma lipids, both groups showed the tendency to increase in TC(total cholesterol), to decrease in TG(triglyceride) and both significantly increased in HDL-C(high density lipoprotein cholesterol). The group of aerobic exercise tended to increase in LDL-C(low density lipoprotein cholesterol) but the group of combined exercise tended to decrease. With regards to the changes of the body composition, fitness factors, muscular strength, plasma lipids that have occurred in the obese middle-aged women in this research, a conclusion can be reached that combined training, rather than only an aerobic exercise, is a more effective way of improving fitness factors and muscular strengthas well as losing weight and reducing the risk of coronary disorder.