Yojiro Seki

LASER POWER DEPENDENCE OF PARTICULATE FORMATION ON PULSE LASER DEPOSITED FILMS

The density and the size of particulates in films laser‐deposited at room temperature using various target materials were observed to depend strongly on the target material and the laser power density. However, loose universal relations between the deposition rates and the particulate density as well as the particulate size were found, where the latter corresponds approximately to the ratio of the laser power density to the ablation threshold. Furthermore, particulates consisting of only some of the target elements such as CuOx were found. Additionally, an acceptably high deposition rate was obtained by using halide and sulfide targets. These materials offer a possibility of deposition using a low power laser.

Macroscopically and atomically smooth YBa2Cu3O7 film grown by reactive rapid sequential pulse laser deposition

Abstract A modified version of pulsed laser deposition : R apid S equential P ulsed L aser D eposition (RS-PLD) is proposed. The 500 A thick YBa 2 Cu 3 O 7 (YBCO) films with Tc =80∼90 K were grown in-situ by sequentially irradiating metal targets. Typically, no particulates were observed in the surface area of 100 μm by 100 μm. Fittings to the Grazing Incidence X-ray reflectance (GIXR) gave the surface roughness of ±1.5 A for those on MgO and ±9A for those on SrTiO 3 .

Lighted mirror for microneurosurgery

We describe a newly developed, lighted mirror that provides enough luminous intensity to obtain a clear image in deep operative fields under high magnification. Through the initial neurosurgical procedures in which it was tested, the mirror proved particularly useful for inspecting the ventral aspect of the fifth nerve in a microvascular decompression for trigeminal neuralgia, and for observing the fundus of the internal auditory meatus after removal of an acoustic neuroma to ensure no residual tumor.

Effect of cerebrospinal fluid shunt surgery on lower urinary tract dysfunction in idiopathic normal pressure hydrocephalus

To examine the outcomes of lower urinary tract symptoms (LUTS) and urodynamic test results after cerebrospinal fluid (CSF) shunt surgery in idiopathic normal pressure hydrocephalus (iNPH).

14. Re-appearance of ABRs after removal of a large CPA meningioma

The effectiveness of CPAP therapy on central sleep apnea (CSA) remains controversial and factors associated with such effectiveness are still unclear. We investigated effectiveness of CPAP on CSA and related factors, focusing on body position during sleep and presence or absence of underlying cardiac dysfunction. Among 7268 subjects who underwent polysomnography, 115 patients who had central apnea hypopnea index (CAHI) P15 were analyzed. We excluded 47 patients who had rarely lateral position during sleep (<20%). We found 34 subjects (50%) showed significant reductions in AHI on CPAP (i.e. effective group, defined AHI 65 on CPAP or >80% reduction from the diagnostic AHI) whereas residual 34 subjects did not show such reductions (i.e. ineffective group). Ineffective group showed significantly greater AHI on lateral position (L-AHI) and lower % of slow wave sleep (%SWS) on diagnostic study, and more frequently had cardiac dysfunction as compared with effective group. Multivariate logistic regression analysis showed greater LAHI, lower %SWS and presence of cardiac dysfunction are independently associated with the CPAP-ineffectiveness. Our findings suggest that in addition to the underlying cardiac dysfunction, CSA on lateral position may play a role to determine CPAP effectiveness on CSA.

120. Limitations of auditory brainstem response (ABR) monitoring in surgery for acoustic neurinoma: A report on two cases

We present a 35-year-old man with abnormal nocturnal behavior during EEG-wakefulness. He has been diagnosed as depression and panic disorder which were treated with several tranquilizers. His wife complained about his abnormal behaviors during sleep period, such as screaming, walking and going outside with opening locked door. However, he was always completely amnestic for such behaviors. Though he was young, he was initially suspected to have REM sleep behavior disorder. However, in the polysomnography, such abnormal behaviors occurred during EEG-wakefulness just after short-term REM sleep. Next morning, he was totally amnestic about such behaviors. Therefore, he was diagnosed as sleep related dissociative disorder. This case reminds us to perform polysomnography for all cases with psychiatric disorders in order to diagnose such nocturnal behavior disorder, appropriately.