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척추에 발생한 고립성 혈질세포종양 : 증례보고 Case Reports
한성문,황금철,김동희,박권희,김대조 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.3
Solitary plasmacytoma of bone, one form of plasma cell neoplasms, is relatively rare. We successfully treated two cases of solitary plasmacytoma of the spine. Both patients underwent surgery. In a 46-year-old female, the tumor of C7 vertebral body was removed completely and the patient received postoperative radiotherapy(5400 rad). After a follow-up period of 27 months, she had no local recurrence. In the other 42-year-old male, the tumor of the T6 vertebral body was partially removed and the patient did not receive postoperative radiotherapy. After 20 months, the patient had local recurrence with serious neurological deficits(paraparesis). We removed the regrown tumor mass totally, and his symptoms and signs were improved clinically. Then he received radiotherapy(5000 rad). After the mean follow up period of 33 months, neither patient developed disseminated systemic myeloma. The outcome of solitary osseous plasmacytoma is relatively good with surgically excision followed by local irradiation. Close long term follow-up of solitary plasmacytoma of bone is needed to detect progression to multiple myeloma. We report two cases of solitary plasmacytoma of bone with a brief review of the literature.
한성문,왕용필,정형환,주수원 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.1
This paper analyzed the static voltage collapse phenomenon and the dynamic voltage collapse phenomenon by means of fluctuations of active-reactive power and the fluctuations of active power offered an output from the load bus respectively. The results are summarized as follows 1. In static state, the voltage collapse value can be computed by applying the equilibrium equation of active- reactive power to Jacobian, the bifurcation point can be also found. 2. The voltage collapse broke out by the reactive power loss and it is found that the active power has an effect on the voltage collapse phenomenon. 3. When a disturbance is given to the active power of the infinite bus voltage side, it is showed that a voltage is collpased by change of the load angle and the current in a dynamic fuctuation of the transient internal voltage E'_(q), E'_(d).