Faculty Profiles - SHIOKAWA, Kazuo

Papers - SHIOKAWA, Kazuo

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Observations and modeling of 630 nm airglow and total electron content associated with traveling ionospheric disturbances over Shigaraki, Japan Reviewed Open Access

Ogawa T, Balan N, Otsuka Y, Shiokawa K, Ihara C, Shimomai T, Saito A

EARTH PLANETS AND SPACE Vol. 54 ( 1 ) page： 45-56 2002

Imaging observations of the equatorward limit of midlatitude traveling ionospheric disturbances Reviewed Open Access

Shiokawa K, Otsuka Y, Ejiri MK, Sahai Y, Kadota T, Ihara C, Ogawa T, Igarashi K, Miyazaki S, Saito A

EARTH PLANETS AND SPACE Vol. 54 ( 1 ) page： 57 - 62 2002

Plasmaspheric electron content in the GPS ray paths over Japan under magnetically quiet conditions at high solar activity Reviewed Open Access

Balan N, Otsuka Y, Tsugawa T, Miyazaki S, Ogawa T, Shiokawa K

EARTH PLANETS AND SPACE Vol. 54 ( 1 ) page： 71 - 79 2002

The wave2000 campaign: overview and preliminary results Reviewed

Iwagami N, Shibaki T, Suzuki T, Yamada Y, Onishi H, Takahashi Y, Yamamoto H, Sekiguchi H, Mori K, Sano Y, Kubota M, Murayama Y, Ishii M, Oyama KI, Yoshimura R, Shimoyama M, Koizumi Y, Shiokawa K, Takegawa N, Nakamura T

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS Vol. 64 ( 8-11 ) page： 1095 - 1104 2002

A stable auroral red arc observed over Japan after an interval of very weak solar wind Reviewed Open Access

Shiokawa K, Ogawa T, Oya H, Rich FJ, Yumoto K

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 106 ( A11 ) page： 26091 - 26101 2001.11

Imaging observations of midlatitude ionospheric disturbances during the geomagnetic storm of February 12, 2000 Reviewed Open Access

Sahai Y, Shiokawa K, Otsuka Y, Ihara C, Ogawa T, Igarashi K, Miyazaki S, Saito A

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 106 ( A11 ) page： 24481 - 24492 2001.11

Small-scale gravity waves near the mesopause observed by four all-sky airglow imagers Reviewed Open Access

Ejiri MK, Shiokawa K, Ogawa T, Nakamura T, Maekawa R, Tsuda T, Kubota M

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 106 ( D19 ) page： 22793 - 22799 2001.10

Bi-directional electron distributions associated with near-tail flux transport Reviewed

Sergeev VA, Baumjohann W, Shiokawa K

GEOPHYSICAL RESEARCH LETTERS Vol. 28 ( 19 ) page： 3813 - 3816 2001.10

Three-channel imaging Fabry-Perot interferometer for measurement of mid-latitude airglow Reviewed

Shiokawa K, Kadota T, Ejiri MK, Otsuka Y, Katoh Y, Satoh M, Ogawa T

APPLIED OPTICS Vol. 40 ( 24 ) page： 4286-4296 2001.8

Clinical analysis and prognostic study of ossified ligamentum flavum of the thoracic spine Reviewed

K Shiokawa, J Hanakita, H Suwa, M Saiki, M Oda, M Kajiwara

JOURNAL OF NEUROSURGERY Vol. 94 ( 2 ) page： 221 - 226 2001.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER ASSOC NEUROLOGICAL SURGEONS

Object. A variety of factors may affect surgery-related outcome in patients with ossification of the ligamentum flavum (OLF) of the thoracic spine. The aim of this study was to determine these factors on the basis of preoperative clinical and radiological findings.
Methods. The authors treated 31 cases of symptomatic thoracic OLF between 1988 and 1999. The following factors were retrospectively studied: patient age, sex, morbidity level, initial symptoms, chief complaint, duration of symptoms, patellar reflex, Achilles reflex, computerized tomography (CT) finding, presence of intramedullary change determined by magnetic resonance imaging, coexistent spinal lesions, preoperative grade, and postoperative grade.
A decompressive laminectomy was performed in all cases. In 29 patients (94%) improved symptoms were demonstrated postoperatively. In terms of functional prognosis, the preoperative duration of symptoms was significantly shorter in the group of patients with excellent outcomes than in those with fair outcomes (p < 0.05).
No significant difference was observed in the correlation between other factors. To evaluate the degree of preoperative thoracic stenosis and the severity/extent of OLF-induced spinal compression, we used an original OLF CT scoring system. A score of excellent on the CT scale tended to indicate an excellent prognosis (p < 0.01).
Conclusions. Thoracic OLF frequently develops in the lower-thoracic spine in middle-aged men, and it is complicated by various spinal lesions in many cases. Early diagnosis and treatment are important for understanding the clinical symptoms and imaging diagnosis because the present findings suggest that a delay in diagnosis and treatment correlates with the functional prognosis postoperatively.

DOI： 10.3171/spi.2001.94.2.0221

Web of Science

Traveling ionospheric disturbances detected in the FRONT campaign Reviewed Open Access

Saito A, Nishimura M, Yamamoto M, Fukao S, Kubota M, Shiokawa K, Otsuka Y, Tsugawa T, Ogawa T, Ishii M, Sakanoi T, Miyazaki S

GEOPHYSICAL RESEARCH LETTERS Vol. 28 ( 4 ) page： 689 - 692 2001.2

A stable auroral red (SAR) arc observed over Japan after an interval of very weak solar wind Reviewed

J. Geophys. Res. Vol. 106 page： 26,091-26,101 2001

Cleavage pattern modulation of frog's egg under magnetic fields of 10 tesla order Reviewed

M Iwasaka, S Ueno, K Shiokawa

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS Vol. 14 ( 1-4 ) page： 327 - 330 2001

Language：English Publishing type：Research paper (scientific journal) Publisher：IOS PRESS

In the present study, a possible influence of intense magnetic fields on cleavage patterns during the early embryonic development of frogs was studied. The early cleavages in Xenopus laevis were disordered by horizontal magnetic fields of 10 T order. However, the magnetic field effect did not remain until when they become tadpoles.

Web of Science

Three-channel imaging Fabry-Perot interferometer for midlatitude airglow measurement Reviewed

Shiokawa, K, T. Kadota, M. K. Ejiri, Y. Otsuka, Y. Katoh, M. Satoh, T. Ogawa

Appl. Opt. Vol. 40 ( 24 ) page： 4286 - 4296 2001

Thoracic spinal cord herniation presenting with Brown-Séquard syndrome Reviewed Open Access

M. Kajiwara, J. Hanakita, H. Suwa, K. Shiokawa, M. Saiki, M. Oda

Japanese Journal of Neurosurgery Vol. 10 ( 6 ) page： 389 - 393 2001

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Congress of Neurological Surgeons

An increasing number of cases involving spinal cord herniation have been reported since the advent of magnetic resonance imaging (MRI). A 57-year-old woman with a history of previous blunt thoracic back trauma resulting from a traffic accident 9 years ago, presented with Brown-Séquard syndrome. MRI of the thoracic spine revealed ventral displacement of the spinal cord at Th4/5 and a dorsal intradural arachnoid cyst. At surgery, a dural defect about 15 mm in length was identified, into which gliotic spinal cord with arachnoid membrane herniated. The herniated spinal cord was reduced and the dural defect was repaired using Goretex. A postoperative MRI showed the spinal cord in the normal position, and her clinical symptoms improved. We reviewed the characteristics of spinal cord herniations according to the reported cases. These cases can be divided into 2 categories : spontaneous or idiopathic one and post-traumatic ones. The present case is thought to be an idiopathic one, in spite of the patient's blunt back trauma.

DOI： 10.7887/jcns.10.389

Open Access

Scopus

Seasonal variation of gravity waves with various temporal and horizontal scales in the MLT region observed with radar and airglow imaging Reviewed

T Nakamura, T Tsuda, R Maekawa, M Tsutsumi, K Shiokawa, T Ogawa

MIDDLE ATMOSPHERE TEMPORAL AND SPATIAL STRUCTURES Vol. 27 ( 10 ) page： 1737 - 1742 2001

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Seasonal variations of activity and horizontal propagation direction of gravity waves in the MLT region at mid-latitude over Shigaraki, Japan (35 N) are investigated for various time and spatial scales using the MU radar observations and recent airglow imaging observations. Semiannual variation with solsticial maxima and equinoctial minima are generally observed for short period (<5 hours) gravity waves. Eastward preference in summer and westward in winter for horizontal propagation direction is generally observed except for small scale (horizontal wavelength < about 15 km) gravity waves. Meridional preference such as northward in summer and southward in winter is also found in airglow imaging and some of the radar results. The preferential propagation direction between northward and eastward in summer is more commonly observed at various horizontal and time scales. (C) 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0273-1177(01)00310-6

Web of Science

Scopus

Coil embolization of a lacerated lumbar artery due to compression fracture Reviewed Open Access

M. Kajiwara, J. Hanakita, H. Suwa, K. Shiokawa, M. Saiki, M. Oda, N. Nakajima

Japanese Journal of Neurosurgery Vol. 10 ( 7 ) page： 465 - 468 2001

Radiological examinations and surgical approaches for far-lateral lumbar disc herniation Reviewed Open Access

J. Hanakita, H. Suwa, K. Shiokawa, M. Saiki, M. Oda, M. Kajiwara, T. Sato

Japanese Journal of Neurosurgery Vol. 10 ( 10 ) page： 647 - 653 2001

Multi-point observation of short-period mesospheric gravity waves over Japan during the FRONT campaign Reviewed Open Access

Shiokawa K, Ejiri MK, Otsuka Y, Ogawa T, Kubota M, Igarashi K, Saito A, Nakamura T

GEOPHYSICAL RESEARCH LETTERS Vol. 27 ( 24 ) page： 4057 - 4060 2000.12

Traveling ionospheric disturbances observed in the OI 630-nm nightglow images over Japan by using a multipoint imager network during the FRONT campaign Reviewed Open Access

Kubota M, Shiokawa K, Ejiri MK, Otsuka Y, Ogawa T, Sakanoi T, Fukunishi H, Yamamoto M, Fukao S, Saito A

GEOPHYSICAL RESEARCH LETTERS Vol. 27 ( 24 ) page： 4037 - 4040 2000.12

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Papers - SHIOKAWA, Kazuo