• Journal of the Korean Institute of Telematics and Electronics D
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• v.34D no.9
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• pp.43-49
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• 1997

The dependence of the electrical properties in planar MQW - APD & pn, and p - i - n photodiode implanted with oxygen on the annealing emperatures and ion dose has been investigated. The oxygen implantation was performed for inter-device isolation. The leakage current of as-impanted p-i-n photodiode obtained was less than 50 nA. An annelaing temperature dependence study shows an abrupt increase of leakge current at 600.deg.C for all devices under study. This indicates that donor complex centers introduced by the chemical activity of oxygen increase with increasing annelaing temperatures. Furthermore, leakage current was highly correlated with oxygen dose due to th eimplanted related defects.

• Journal of Chest Surgery
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• v.28 no.10
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• pp.946-950
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• 1995

Neurosarcoma is relatively rare, but is seen frequently in association with stigmata of neurofibromatosis ie., Cafe au lait pigmentation and cutaneous neurofibromatosis. Both advanced age and association with neurofibromatosis increase the likelihood of malignant degeneration to neurosarcoma. It also may be dumb bell-shaped with intraspinal extension. Thoracic meningocele is rare and represents a protrusion of the dural sac through an abnormally large or malformed intervertebral foramen. The patient is usually asymptomatic, with evidence of paravertebral mass on the chest rentgenogram. In one operation we removed a "Dumb-bell" neurosarcoma and intrathoracic meningocele in a 52 year old woman using a cervical laminectomy with a trap-door incision. She was discharged at 17 days after the operation with a sequelae of excision of nerve roots C8 and T1. Postoperative radiation therapy was performed during the follow-up period.up period.

• Annals of Clinical Neurophysiology
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• v.7 no.2
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• pp.114-116
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• 2005

Idiopathic facial nerve palsy, or Bell's palsy(BP) is an acute paralysis of the facial muscles innervated by the seventh cranial nerve. The cause and prognosis of recurrent BP are various. The frequency and heterogenicity of etiology suggest a predisposing factor or immune mechanisms. About 10% to 15% of patients with BP will suffer a recurrence, and less than 1.5% will have more than 4 episodes. We report four patients of chronic recurrent BPs.

• Annals of Clinical Neurophysiology
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• v.7 no.2
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• pp.117-120
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• 2005

Hemifacial spasm (HFS) may develop after Bell's palsy (BP). But it was not reported that contralateral HFS occurred simultaneously in acute BP. A 25-year-old woman admitted with left HFS occurred simultaneously in acute right BP for 6 days. Past, family, and social history were unremarkable. Nerve conduction studies (NCS) and blink reflex (BR) test showed bilateral facial neuropathies. Brain MRI and cerebral angiography were normal. The symptoms and signs of HFS and BP were improved slowly after acyclovir and prednisolone therapy. Follow-up serial NCS and BR also showed a rapid improvement.

• The KSFM Journal of Fluid Machinery
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• v.7 no.1 s.22
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• pp.24-29
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• 2004

The inter-comparison of standards is required to be recognized the calibration results. The sonic nozzle package is developed to do inter-comparison of the bell preyer used to calibrate many gas flow meters for industries. Four national metrology institutes (KRISS, CMS, CENAM, NEL) were participated in this inter-comparison. The deviation of calibration data from the average value was small at the low flow rate and large at the high flow rate, respectively At the high flow rate, the deviation was larger than the expected value from uncertainties asserted by NMIs. This means there are some problems in the uncertainty evaluation and experiment procedures in some of the participated NMIs.

• The Korean Journal of Pain
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• v.2 no.1
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• pp.49-56
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• 1989

Bell's palsy is not a serious disease and recovery is spontaneous in more half of the patients, but this recovery is long delayed in many instances and the cosmetic effect of an altered facial appearance is psychologically distressing. The etiology is unknown, but Kettle's ischemic hypothesis has been widely accepted. The aim of treatment is to reduce edema and improve circulation to the facial nerve. Stellate ganglion block (SGB) resulted in abolishing cerebral vascular spasm and in increasing cerebral blood flow. Thus, stellate ganglion block is effective in treatment of Bell's palsy. From 1978 to Oct. 1988, we have treated 222 patients (20 patients were recurred cases) with facial palsy by SGB and analysed the effect of SGB. We noticed that SGB was very effective in early repetitive treatment (90% recovery). This study is reported and the literature is reviewed.

• Korean journal of applied entomology
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• v.39 no.1
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• pp.1-4
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• 2000

Pratylenchoides utahensis Baldwin, Luc & Bell, 1983 is recorded for the first time from Korea. Morphological characteristics are described based on the specimens preserved in Nematology Laboratory, Entomology Division, National Institute of Agricultural Science and Technology; and Department of Agricultural Biology, Kyungpook National University.

• Journal of Haehwa Medicine
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• v.9 no.1
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• pp.259-266
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• 2000

Facial nerve is subject to injury at any point in the course from the cerebral cortex to the motor end plate in the face, so many etiologic varieties of facial paralysis may be encountered, including trauma, viral infection and idiopathic. Author have reviewed the effect of electrodiagnostic test in Bell,s palsy. The electrodiagnostic test is helpful for estimating the prognosis of the Bell's palsy patient.

• The Journal of the Acoustical Society of Korea
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• v.20 no.1
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• pp.30-35
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• 2001

The most important characteristic of Emile Bell's sound is a beating. It is modulation phenomenon which appears as a result of interference multiplication in time domain. This modulation phenomenon can be modeled as DSB-SC which suppress carrier and signals distributed both sides. The beatiog wave is observed in Laman distribution signal for polyvinyl speech signal, water vein wave, tide wave. The beating wave is caused by asymmetry Property of the bell.

• The Pure and Applied Mathematics
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• v.8 no.2
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• pp.145-152
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• 2001

Posner [Proc. Amer. Math. Soc. 8 (1957), 1093-1100] defined a derivation on prime rings and Herstein [Canad, Math. Bull. 21 (1978), 369-370] derived commutative property of prime ring with derivations. Recently, Bergen [Canad. Math. Bull. 26 (1983), 267-227], Bell and Daif [Acta. Math. Hunger. 66 (1995), 337-343] studied derivations in primes and semiprime rings. Also, in near-ring theory, Bell and Mason [Near-Rungs and Near-Fields (pp. 31-35), Proceedings of the conference held at the University of Tubingen, 1985. Noth-Holland, Amsterdam, 1987; Math. J. Okayama Univ. 34 (1992), 135-144] and Cho [Pusan Kyongnam Math. J. 12 (1996), no. 1, 63-69] researched derivations in prime and semiprime near-rings. In this paper, Posner, Bell and Mason＇s results are extended in prime near-rings with some conditions.