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송관영,김혁수,정명훈,안치성,최선욱,최일승,강동수,Song, Kwan Young,Kim, Hyug Soo,Jung, Myung Hoon,Ahn, Chi Sung,Choi, Sun Wook,Choe, Il Seung,Kang, Dong Soo 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.8
Spinal neurenteric cyst results from the persistence of an abnormal communication between endodermal and ne-uroectodermal layer. Embryologically, neurenteric cyst is derived from endoderm that is fused with the developing notochord during the third week of gestation. It is a rare malformation that lead to spinal cord compression. The patient is 19-year-old male presented with chest pain, paresthesia and progressive weakness in his low extremities(grade II/II). Preoperative MR imaging revealed intradural extramedullary cyst with intracystic hemorrhage in T1 and T2 level that is ventrally located and compressed the spinal cord. Involved vertebral bodies were scalloped and fused. The cystic tumor were totally removed through costotransversectomy approach. Postoperatively, motor weakness of the low extremities were improved to the level of grade IV/V. And chest pain and paresthesia were gradually disappeared. Postoperative MR imaging showed the decompression of the thoracic spinal cord. Histologic examination revealed a ciliated columnar epithelial neurenteric cyst. The pre- and postoperative clinical, radiological features of a case of upper thoracic neurenteric cyst is described with review of literature.
유도전동기의 속도제어를 위한 회전자 저항 추정에 관한 연구
鄭敎範,김혁수 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-
This paper investigates Kalman Filter as the rotor resistance esitmator for the speed sensorless vector control of an induction machine. Computer simulations are performed to prove the usefulness of the Kalman filters as the rotor resistance esitmator for the speed sensorless vector control of the induction machine. In the simulation, the induction machine and the inverter using the switching space vector PWM algorithm are included. The Extended Kalman Filter shows the roboustness to the noises in the measurement signals and the excellent characteristics for the rotor resistance estimator under the various operating conditions.