Load frequency control considering distributed generator used Demand Estimation and GA.

This paper examined the load frequency control method in the power system that introduced ditributed generator. Examined content is the case of the distributed generator participated/nonparticipated in the frequency control of the system. Control of the power plant in each area is the case of the control method using the load demand estimation and GA, or TBC. To study the effectiveness of the distributed generator, this paper considered the computer simulation 3-area load frequency control model system which introduced the distributed generator

男性競泳選手の最大下運動負荷に伴う唾液中ストレスホルモンの変動

【Purpose】The purpose of this study was to determine changes in salivary cortisol and testosterone levels when athletes swam at peak performance. Salivary cortisol reflects mental and physical stress, but testosterone reflects only physical stress. Performance requirements were gradually increased until athletes reached their peak performance. A correlation between cortisol and testosterone levels and a correlation between cortisol levels in blood and testosterone levels in saliva have already been demonstrated. Only a medical professional can draw blood, but coaches can sample saliva, so salivary hormone levels can readily be measured. Cortisol and testosterone levels in saliva are reported to fluctuate as a result of stress. Thus, this study examined whether salivary cortisol and testosterone levels are an effective index for physical training.【Methods】Subjects were 14 male swimmers who were university students. All of the subjects had successfully participated in student swimming competitions in Japan. Subjects swam freestyle for 200 m. Subjects swam 4 times (best time +40 seconds, +30 seconds, +20 seconds, and maximal effort) and were given a rest time of 15 minutes between each attempt. Cortisol and testosterone levels in saliva were measured at rest immediately after swimming, after three attempts, after swimming with maximal effort, and 10, 20, 40, and 60 minutes after swimming.【Results】Salivary cortisol and testosterone levels were significantly higher 20 minutes after swimming (1.15±0.01 μg/ml and 1.66±0.04 pg/ml, respectively)， and those levels were significantly lower (p<0.05) during rest (1.11±0.01 μg/ml and 1.70±0.03 pg/ml, respectively)．【Discussion】Swimming with maximal effort was likely to increase salivary cortisol levels and decrease salivary testosterone levels. A study has reported that physical stress and psychological stress are associated because of the reaction in the hypothalamus. This may explain why a combination of mental and physical stress produced changes in salivary cortisol levels. Maximal physical effort affected testosterone levels. The measurement of cortisol and testosterone levels in saliva may provide a new training index for competitive swimming

A Study of a Optimal reclosing in power system

This paper proposes the optimum reclosing operating method. The proposed method calculates the optimum time, taking the case as a standard in which the reclosing is not done. And, the execusion of reclosing time is calculated considering the fault time and the acceleration/deceleration energy got in stores in the generator in the fault. It can be expected that the generator phase angle is suppressed by this optimum reclosing operation. Therefore, the system stability improvement system effect can be expected by carrying out the optimum reclosing, when the fault arose. At present, it has been set at the value which seems to be optimum considering various problems in the reclosing time. However, in this method the system stability improvement effect can not be expected. It was demonstrated that the optimal reclosing method have depression effect of the δ of generation in the computer simulation using Impavt Ver 2.2.

認知症 --未病で見つけ未病で防ぐ--

京都大学アカデミックデイ2023開催日時: 2023年9月24日(日) 11:00-18:00会場: ゼスト御池（京都市役所前地下街）河原町広場、寺町広場、御幸町広場主催: 学術研究展開センター(KURA)，研究推進部研究推進課，「国民との科学・技術対話」ワーキンググループ京都大学の学術研究成果発信の一環として包括的に登

ケイブ コユウ カンカク トレーニング ガ ジュウシン ドウヨウ ニ オヨボス エイキョウ ニ ツイテ ノ ケンキュウ

PURPOSE: The purpose of this study was to investigate the effectiveness of cervicocephalic kinesthetic training on postural stability and neck joint position sense in healthy young adults. METHOD: 33 subjects were recruited for this study and randomly divided into training （n＝16） and control groups （n＝17）. The training group performed cervicocephalic kinesthetic training for 5 minutes per day for 10 days and the control group performed the same training but with eyes closed to eliminate visual feedback. All training sessions for both groups were performed under supervision. Pre and post cervical joint position sense and sensory organization testing （SOT） were measured on both groups. RESULT: Significant differences were found in cervical joint position sense and SOT condition 6 in the training group. No significant differences were found in SOT condition1-5 in both groups and cervical joint position in the control group. CONCLUSION: The improvements of postural stability and cervical joint position sense after 10 days of cervicocephalic kinesthetic training suggest that cervical joint position sense may may be beneficial for postural stability in healthy young adults