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손대언,송창훈,한세준,이미자,기근홍 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2
Recently, the use of Ultrasonography as a diagnostic method in detection of fetalanomalies during pregnancy has been increased because of the safety. Many fetal genitourinary anomalies were reported as early as mid trimester by transabdomonal sonography. We experienced a case of bilateral polycystic kidney in 23th months gestatational aged fetus, diagnosed by transabdominal ultrasonography and pathologic authopsy.
李鍾哲,崔震浹,裵啓宣,孫興大 동아대학교 환경문제연구소 1979 硏究報告 Vol.3 No.1
Those studies were examined rearing two varieties on Japanese descent and two varieties of Chinese descent by feeding polluted mulberry leaves, non-polluted ones and water-cleaned ones respectively to find effects air-pollution on the economic characters of silkworms and analysis of contents of Sulphur and Cadmium in the mulberry leaves and silkworms as followings; 1) Japanese descent of polluted part was delayed about 2.5 days than non-polluted part, Chinese descent was delayed about days or inequal and water-cleaned part was medium in the silkworm larval duration. 2) Results of maximum weight of 5th instar, cocoon later weight and cocoon weight were decreased in due order non-polluted, water-cleaned and polluted in the factors of mulberry. 3) Pupal ratio of Japanese descent was not shown statistical significance, but Chinese descent was revealed it obviously in the factors of mulberry leaves. 4) In the resistance of polluted mulberry leaves, Chinese descent was feeble obviously than Japanese and there were some difference even through among the same varieties. 5) The contents of S and Cd of polluted area mulberry leaves was increased about 30% and 300% respectively than non-polluted area. 6) The fed part of non-polluted mulberry leaves was S 0.41% and Cd 0.013 ppm water-cleaned part was S 0.47% and Cd 0.024 ppm and polluted part was S 0.52% and Cd 0.042 ppm in the contents of S and Cd of silkworm larvae. 7) The contents of S and Cd didn't make visible injury in mulberry leaves but made it seriously in silkworm larvae. 8) The injury of dust on mulberry leaves was more serious than that of quality of mulberry leaves by air-pollution in the economic characters of silkworm. 9) As above results, Chinese descent should avoid contaminated area and it rearing by water-cleaned mulberry leaves can get noticable reults in inevitable case on selection of parents silkworm rearing-zone.
Accurate Voltage Parameter Estimation for Grid Synchronization in Single-Phase Power Systems
Dai, Zhiyong,Lin, Hui,Tian, Yanjun,Yao, Wenli,Yin, Hang The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
This paper presents an adaptive observer-based approach to estimate voltage parameters, including frequency, amplitude, and phase angle, for single-phase power systems. In contrast to most existing estimation methods of grid voltage parameters, in this study, grid voltage is treated as a dynamic system related to an unknown grid frequency. Based on adaptive observer theory, a full-order adaptive observer is proposed to estimate voltage parameters. A Lyapunov function-based argument is employed to ensure that the proposed estimation method of voltage parameters has zero steady-state error, even when frequency varies or phase angle jumps significantly. Meanwhile, a reduced-order adaptive observer is designed as the simplified version of the proposed full-order observer. Compared with the frequency-adaptive virtual flux estimation, the proposed adaptive observers exhibit better dynamic response to track the actual grid voltage frequency, amplitude, and phase angle. Simulations and experiments have been conducted to validate the effectiveness of the proposed observers.
Hung, Nguyen Dang,Sok, Dai-Eun,Kim, Mee Ree Birkhäuser 2012 Inflammation research Vol.61 No.5
<P>The aim of this study was to examine the inflammation induced by saturated acyl lysophosphatidylcholine (LPC) in vivo and to investigate whether it could be attenuated by the action of polyunsaturated acyl lysophosphatidylcholines (LPCs), which are known as anti-inflammatory lipid mediators.</P>