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梁保錫,吳世奎 釜山水産大學校 1981 釜山水産大學 硏究報告 Vol.21 No.2
2個의 rotor가 附着된 回轉軸系에 非線形 復元力을 考慮할 경우 第一, 二共振嶺域에서 發生하는 一般的인 振動特性을 Krylov 및 Bogoljubov 法으로 解析하였고 analog 實驗으로 妥當性을 확인하였다. 定常狀態의 共振曲線 形狀은 偏心의 位相差, 非線形項의 係數 및 減衰係數에 影響을 받으며, 共振嶺域에서의 最大振幅은 特히 偏心의 位相差에 크게 影響을 받게 된다. 主共振嶺域에서 발생하는 不安定區間은 減衰의 增加에 따라 減少하여 消滅하게 된다. 理論解析과 analog 實驗의 結果가 잘 一致함을 確認하였다.
直交流中의 官列의 流力彈性振動에 관한 硏究 - Ⅰ 實驗
梁保錫,岩壺卓三 釜山水産大學校 1985 釜山水産大學 硏究報告 Vol.25 No.1
A basic fluidelastic excitation mechanism causes large whirling vibrations of tubes in model arrays when the flow velocity exceeds a critical value. The nondimensional critical velocity is ?? where ?? the threshold instability constant is a function of the tube pattern and spacing. In this paper, ?? were given that were obtained from experiment on single-row tube array in uniform crossflow. The vibration characteristics of tube array were described as a function of flow velocity.
이경동,양민석,정연규,손보균,조주식,이성태,김필주 한국농화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.2
본 연구는 3요소(N-PO_2O_5-K_2O)처리가 산국(Chysanthemum boreale M.)의 수량과 유효성분에 미치는 효과를 조사하여 효과적인 재배시스템을 개발하고자하였다. 처리구는 무처리, NPK(250-160-160), NK(250-0-160), PK(0-160-160kg/ha)의 5처리로 설정하여 산국을 재배한 결과, 건물수량은 NPK처리구가 PK처리구에 비하여 4.0배의 증수가 있었으며, 다른 처리구보다 무기이온의 흡수율, 생육 및 수량에서 NPK처리구가 가장 우수하였다. 식용으로 많이 쓰이는 꽃의 주요 아미노산은 proline, glutamic acid과 aspartic acid이였고, 다른 처리구들에 비하여 NPK처리구가 높은 함량을 보였다. 혈압강하효과가 우수한 cumambrin A는 PK처리구에 비하여 NPK처리구가 6.2배의 증수효과가 있었다. NK처리구는 NP처리구보다 cumambrin A의함량을 높이기 위해서는 인산의 시용보다 칼리의 시용이 더 요구되며, 야외포장에서의 인산과 칼리의 적정 시비량의 설정이 필요하다고 판단된다. To establish the fertilization condition to increase the productivity of Chrysanthemum boreale M. with high quality, the effects of three nutrients (N, P, K) on the yields and the effective components were investigated in the pot scale. NPK was applied by chemical fertilizers with N-P_2O_5-K_2O = 250-160-160 kg/ha as a main treatment, and NP (N-P_2O_5 = 250-160 kg/ha), NK (N-KO = 250-160 kg/ha), and PK (PO_2-KO_5 = 160-160 kg/ha) treatments were settled as comparison. Dry yields of C. boreale M. was increased significantly to 4 fold higher by nitrogen. Nitrogen increased apparently plant growth and inorganic nutrient uptake. In the flower, which is most useful and edible part as a herbal medicine, main amino acids were glutamic acid and aspartic acids, and the total content was increased significantly by three elements of application. In addition, the content of cumambrin A, which is known to have the effect of blood-pressure reduction, was increased source to 6.2 times by nitrogen higher than that in PK treatment. Potassium was more effective in biosyndiesis of cumatnbrin A than phosphorus, but the biological pathway was not clear, still.
Bo-Suk Yang,Soo-Jong Lee,Tian Han 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.12
This paper proposes a condition classification system using wavelet transform, feature evaluation and artificial neural networks to detect faulty products on the production line of reciprocating compressors for refrigerators. The stationary features of vibration signals are extracted from statistical cumulants of the discrete wavelet coefficients and root mean square values of band-pass frequencies. The neural networks are trained by the sample data, including healthy or faulty compressors. Based on training, the proposed system can be used on the automatic mass production line to classify product quality instead of people inspection. The validity of this system is demonstrated by the on-site test at LG Electronics, Inc. for reciprocating compressors. According to different products, this system after some modification may be useful to increase productivity in different types of production lines.