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뇌동맥류 진단에 대한 전산화단층촬영 혈관조영술의 유용성
제현,정신,김태호,이제혁,박종근,김재휴,김수한,강삼석 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.2
In this study we have demonstrated the usefulness of the 3D-computed tomography in the evaluation of cerebral aneurysms as well as presenting the technical considerations and problems in its practical use. Between September 1994 and February 1995, we carried out computed tomographic angiography(CTA) in 29 patients using helical CT(General Electric HiSpeed Advantage unit). There were 15 females and 14 males, aged between 28 and 71 years. The CT angiography was performed for the following five reasons: 1) Further evaluation of a failed conventional cerebral angiography(three cases). 2) Impermissible condition of conventional cerebral angiography(six cases). 3) suspicion of aneurysm or subarachnoid hemorrhage on conventional CT scan(eleven cases). 4) Further evaluation of proven subarachnoid hemorrhage with no or suspicious cerebral angiographic finding(seven cases). 5) Follow-up of residual aneurysm sac(two cases). This early experience of computed tomographic angiography using helical CT was encouraging in uspect to its usefaluess in the evaluation of cerebral aneurysms in the arteries around the circle of Willis.
제해준,박병원,홍성현,홍국선 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.5
Chemical reaction occurred in the interface of Mn-Zn ferrite and glass after bonding. Effects of the formation of reaction layer on the magnetic properties were investigated. The composition of glass was 23PbO-61SiO2-6ZnO-8Na2O-2K2O and the ferrite was chosen to have a high permeability. Toroid samples of ferrites bonded with glasses, were heat-treated at $700^{\circ}C$, 80$0^{\circ}C$ and 90$0^{\circ}C$ for 1h. The reaction was observed to increase with bonding temperature, resulting in the development of reaction layer. Subsequently the initial permeability was found to be decreased. The permeabilities decreased by 25% with increasing bonding temperature from $700^{\circ}C$ to 80$0^{\circ}C$. At the bonding temperature of 90$0^{\circ}C$, the permeability was decreased by 45%, compared to that of 80$0^{\circ}C$.