• Journal of Sensor Science and Technology
• /
• 제11권3호
• /
• pp.171-182
• /
• 2002

The differential electromagnetic transducer for IME(implantable middle ear) system, which have two small permanent magnets glued with the same pole facing each other in the coil, has high vibration efficiency and does not influenced by external magnetic field. In this paper, using finite element method, highly efficient structure of the transducer was proposed and vibration force of the transducer was calculated by electromagnetic theory. And the necessary vibration force of transducer to transmit the sound signal to inner ear when the transducer is attached at stapes was calculated and the design parameters of the transducer were investigated. Using the parameters, the differential electromagnetic transducer was manufactured in small size to implant in confined human middle ear. And it was examined by unloaded and loaded vibration experiment using temporal bone sampled from cadaver.

• Korean Journal of Medicinal Crop Science
• /
• 제22권6호
• /
• pp.497-503
• /
• 2014

In order to produce the high quality of dried-ear mushroom, various drying methods such as hot-air drying at $40{\sim}80^{\circ}C$, freeze drying and drying in vinyl house were carried out. Drying hours of hot-air drying, freeze drying and drying in vinyl house were 12.5~21.5, 36.0 and 72.0 hrs, respectively. Vitamin $D_2$ content of sample was the highest as $6.77{\mu}g/g$ DW in drying in vinyl house and then followed by freeze drying as $5.90{\mu}g/g$ DW and hot-air drying as $1.89{\sim}5.01{\mu}g/g$ DW. After dry, external appearance and color of mushrooms applied hot-air drying and drying in vinyl house were better than freeze-dried one. After rehydration, water uptake of sample in drying in vinyl house and hot-air drying at $50{\sim}60^{\circ}C$ were 17.8 and 19.3~21.0 times, respectively. The methods of drying in vinyl house and hot-air drying at $50{\sim}60^{\circ}C$ also led to high hardness, good shape and resilience. As the results of production of dried-ear mushroom with high quality, we suggest that the best method for drying is the drying in vinyl house due to not only high vitamin $D_2$ content, good external appearance and color after drying but also high hardness and good shape after rehydration.

• Animal Systematics, Evolution and Diversity
• /
• 제37권3호
• /
• pp.205-211
• /
• 2021

This study investigates the morphological and skull characteristics of the Siberian weasel Mustela sibirica quelpartis from the Jeju Island, South Korea. A total of 26 roadkill specimens (22 males and 4 females) were collected from October 2012 to April 2016. All collected specimens were examined for morphological characteristics, but only 19 specimens (16 males and 3 females) were in a good enough condition to process for skull measurements. This study showed no significant differences in ear length between male and female (p>0.05), and significant differences were found in head-body length, tail length (TL), and hind-food length (p<0.05). Both the male and female of M. s. quelpartis were larger in its external characteristics except for TL than M. s. coreanus living in the mainland of South Korea. M. s. quelpartis males have a smaller skull size than their female counterparts. In general, both male and female M. s. quelpartis showed external characteristics in line with the Island Rule. The findings of this study are important in order to shed more light on the evolutionary mechanism of small mammals living on the Jeju Island.

• Journal of Audiology & Otology
• /
• 제24권2호
• /
• pp.79-84
• /
• 2020

Background and Objectives: Hearing can be elicited in response to vibratory stimuli delivered to fluid in the external auditory meatus. To obtain a complete audiogram in subjects with normal hearing in response to pure tone vibratory stimuli delivered to fluid applied to the external meatus. Subjects and Methods: Pure tone vibratory stimuli in the audiometric range from 0.25 to 6.0 kHz were delivered to fluid applied to the external meatus of eight participants with normal hearing (15 dB or better) using a rod attached to a standard clinical bone vibrator. The fluid thresholds obtained were compared to the air conduction (AC), bone conduction (BC; mastoid), and soft tissue conduction (STC; neck) thresholds in the same subjects. Results: Fluid stimulation thresholds were obtained at every frequency in each subject. The fluid and STC (neck) audiograms sloped down at higher frequencies, while the AC and BC audiograms were flat. It is likely that the fluid stimulation audiograms did not involve AC mechanisms or even, possibly, osseous BC mechanisms. Conclusions: The thresholds elicited in response to the fluid in the meatus likely reflect a form of STC and may result from excitation of the inner ear by the vibrations induced in the fluid. The sloping fluid audiograms may reflect transmission pathways that are less effective at higher frequencies.

• Korean Journal of Audiology
• /
• 제24권2호
• /
• pp.79-84
• /
• 2020

Background and Objectives: Hearing can be elicited in response to vibratory stimuli delivered to fluid in the external auditory meatus. To obtain a complete audiogram in subjects with normal hearing in response to pure tone vibratory stimuli delivered to fluid applied to the external meatus. Subjects and Methods: Pure tone vibratory stimuli in the audiometric range from 0.25 to 6.0 kHz were delivered to fluid applied to the external meatus of eight participants with normal hearing (15 dB or better) using a rod attached to a standard clinical bone vibrator. The fluid thresholds obtained were compared to the air conduction (AC), bone conduction (BC; mastoid), and soft tissue conduction (STC; neck) thresholds in the same subjects. Results: Fluid stimulation thresholds were obtained at every frequency in each subject. The fluid and STC (neck) audiograms sloped down at higher frequencies, while the AC and BC audiograms were flat. It is likely that the fluid stimulation audiograms did not involve AC mechanisms or even, possibly, osseous BC mechanisms. Conclusions: The thresholds elicited in response to the fluid in the meatus likely reflect a form of STC and may result from excitation of the inner ear by the vibrations induced in the fluid. The sloping fluid audiograms may reflect transmission pathways that are less effective at higher frequencies.

• The Korean Journal of Pain
• /
• 제1권1호
• /
• pp.103-105
• /
• 1988

Ramsey Hunt Syndrome occurs when herpes zoster afters the facial nerve. It causes vesicular eruption of the pinna, external auditory meaturs and ear drum, severe otalgia with associated facial paralysis and vertigo. We experienced a case of Ramsey Hunt syndrome and managed it with repeated sympathetic blocks using a stellate ganglion block. We achieved early resolution of the eruption, relief of pain and prevention of postherpetic neuralgia. We concluded that SGB was effective treatment against Ramsey Hunt Syndrome.

• 대한두경부종양학회:학술대회논문집
• /
• 대한두경부종양학회 2007년도 추계학술대회 논문집
• /
• pp.215-215
• /
• 2007

• Korean Journal of Head & Neck Oncology
• /
• 제31권1호
• /
• pp.47-49
• /
• 2015

An osteoma of the external auditory canal(EAC) is an uncommon benign tumor. If a canal obstruction occurs, ear fullness or conductive hearing loss can arise. But, the association of an osteoma with a cholesteatoma is extremely rare. Therefore, we report a case of a 35-year-old female patient with osteoma of temporal bone that was complicated with EAC cholesteatoma.

• Journal of Veterinary Clinics
• /
• 제15권2호
• /
• pp.263-266
• /
• 1998

외이도의 직경 및 길이와 외이도 질환과의 연관성을 알아보고자 73두 성견을 실 험에 이웅하였다. 임상중상, 배양 및 도말 검사를 통하여 외이 질환이 얼는 정상군 57개의 이 관과, 질환이 있는 비정상군 89개의 이관에 직경과 길이를 평가하기 위한 간접적인 방법으로 이관내 조영술을 실시하였다. 비정상군은 정상군에 비하여 윤상연골 및 귓바퀴 연골의 직경 이 더 넓었다. 수직외이도를 구성하는 귓바퀴 연골의 길이는 비정상군4(12.79{\pm} 3.08)이 정상 군(12.79{\pm}5.87 mm)$에서 보다 유의성 있게 길게 나타났다(p<0.001). 심한 외이도 협착증을 보이는 21개의 귀에서는 외이도 질환을 발견할 수 없었으며, 외이도 질환이 심한 귀에 있어 서 그 직경과 길이가 정상군에 비하여 넝고 길게 나타났다(p<0.05). 본 실험의 결과로 보아 외이도관의 협착증과 외이도 질환과는 연관성이 발견되지 않았으나, 환기와 귀내 분비물의 배출을 방해하는 긴 수직외이도를 갖는 귀가 외이도 질환과 밀접한 관계가 있는 것으로 생각 되었다.

• Maxillofacial Plastic and Reconstructive Surgery
• /
• 제15권2호
• /
• pp.81-91
• /
• 1993

Arthrosis of the temporomandibular joint is defined as a disease of a joint with chief complaint of pain, clicking, limited jaw movements. Generally, most patients with the temporomandibular arthrosis can be treated conservatively with muscle relaxation therapy combined with mandibular repositioning prostheses, followed by occlusal equilibration, restorative dentistry and/or orthodontics, and many other forms of treatment. In case prior nonsurgical treatment proved to be ineffective or the disease is chronic and severe, surgical operation is recommended. For patients with arthrosis of the temporomandibular joint, only discectomy as therapeutic method of the surgical treatment should not be applied and the removed articular disc of the temporomandibular joint should be replaced. Allograft such as Proplast-Teflon, Silastic, etc have been used as replacements of removed articular disc. However, these allograft materials have caused complications such as inflammatory changes, foreign body reactions. As a result, a replacement material which is autogenous, space occupying, easy to harvest and less inflammatory change has been developed. Auricular cartilage with perichondrium satisfies many of these requirements. The apparent advantages of autogenous auricular cartilage as an interpositional graft after a discectomy are as follows, (1) the form of the external ear corresponds to joint morphology, (2) a graft of adequate size can be harvested, (3) the form of the external ear remains unchanged after surgery, (4) the graft can be obtained adjacent to the surgical site, (5) biologically acceptable material is used, (6) the additional expense of allogenic graft is avoided. Because we considered autogenous auricular cartilage as a good replacement material, removed articular disc has been replaced with fresh autogenous auricular cartilage in the case of three patients. The result of the treatment is favorable, and the cases being presented here.