• Applied Chemistry for Engineering
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• v.2 no.3
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• pp.216-221
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• 1991

Surface activities of four potassium N-acyl-N-methyl-${\beta}$-alaninate including surface tension, foaming power, foam stability, emulsifying power and dispersion power were measured respectively, and critical micelle concentration(cmc) was evaluated. Consequently these anionic surfactants with long chain acyl amide showed good emusifying power of O/W type, foaming, foam stability and dispersion effect.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.30 no.2
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• pp.82-86
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• 2019

In the field of otolaryngology-head and neck surgery, botulinum toxins are widely used for the treatment of spasmodic dysphonia and vocal tremors. Recently, the applications of botulinum toxin have gradually expanded with time, to include vocal fold granuloma, mutational falsetto, bilateral vocal cord paralysis, and chemical reduction for arytenoid dislocation as an adjunctive modality. According to a nation-wide multicenter study conducted by the Korean Society of Laryngology, Phoniatrics and Logopedics for treatment modality of contact granuloma, among the various treatment modalities, botulinum toxin injection showed the highest response rate and lowest recurrence rate in both primary and refractory cases. Therefore, botulinum toxin could be reserved as a second-line treatment for contact granuloma in which the first treatment was not effective, but also could be used as a first-line treatment depending on the patient's and institution's situation. For recalcitrant nodules, injection of botulinum toxin into the bilateral thyroarytenoid muscle will reduce glottal contact force and result in a forceful chemical voice rest. In special situations, botulinum toxin injection could be one of the alternative treatment options for recalcitrant vocal nodules.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.90-93
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• 2014

국내에서 DMB 방송은 대부분의 국민이 휴대하는 휴대폰에 수신기능이 구현되어 있고, 차량 네비게이션에서도 DMB 수신이 가능하여 상당히 보편적 미디어 창구이다. 본 연구에서는 DMB기반의 국지적 재난방송은 국지적 재난의 빈번한 발생과 휴대 기기가 갖는 고유의 개인 중심성과 이동성은 국지적 재난 미디어로 활용할 기술 개발은 큰 의미를 가진다. 국지적 재난방송을 위한 DMB 재난방송 서비스 모델과 방송 시스템 상위 설계 및 기술요구사항 도출 등의 연구를 연차별로 진행 하였다. DMB방송 시스템을 운영한 KBS의 경험을 반영하고, 국지적 방송을 위한 저비용의 시스템을 목표로 국지적 재난 정보 전달에 적합한 방송 시스템 상위 설계와 시스템 간 인터페스 및 기술 개발에 필요한 상세 요구사항을 분석하였다. 이러한 연구의 정확성과 실제 상용화 가능성을 높이기 위해 DMB 방송 차량을 이용한 필드 테스트를 추진하였다. 필드 테스트 에서는 KBS 재난방송시스템과 실시간 연동을 통해 향후 실제 재난방송에 활용 될 수 있는 방송 시스템 운용에 필요한 사항 들을 점검하였다.

• Journal of Navigation and Port Research
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• v.35 no.3
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• pp.205-211
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• 2011

As the increase in maritime traffic and leisure, the marine accident risk has increased in the domestic coast. In this study, the cause and the environment of domestic marine accidents from 1990 to 2009 have been investigated and analyzed by using the statistics issues of Korean Maritime Safety Tribunal. Based on the analysis of most domestic marine accidents such as engine damage, collision, capsizing of small vessels, we propose how to use mobile telecommunication terminals for preventing marine accidents and the best countermeasures.

• The Korean Journal of Food And Nutrition
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• v.15 no.4
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• pp.289-294
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• 2002

This study attempted to evaluate the effectiveness of function of Wax Ground for obesity and the related disease of adult people can be developed by the combination of the 17 food materials screened in this study. The experiments using Sprague-Dawley male rats show that seventeen kinds of food material inhibited the increase of body weight gain, energy intake, fat pads weight, liver triglycerides content, atherogenic index, and blood glucose concentration induced by cafeteria diet. Oral administration of wax gourd decreased most body weight gain, energy intake, fat pads weight, and blood glucose concentration. Liver triglycerides content was the lowest in the group administered mulberry stem extract and the group administered pine leaves showed the lowest atherogenic index. The combined administration of wax gourd, mulberry stem extract and pine leaves improved more the obesity and related symptoms than the individual administrations.

• Journal of Korean Neurosurgical Society
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• v.30 no.5
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• pp.666-669
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• 2001

We report a case of meningeal hemangiopericytoma presenting as metastasis in the vertebral body and pedicle of the thoracic spine. Hemangiopericytoma is a rare vascular neoplasm. Although the tumor has a strong propensity for both local recurrence and extracranial metastasis, metastasis to thoracic spine is very rare and only two cases were found in the literature. A 44-year-old woman with paraparesis and pain in the thoracic and lower legs was examined by plain radiographs and magnetic resonance imaging. The intracranial hemangiopericytoma was operated 3 years ago. Magnetic resonance imaging demonstrated a tumor invading the left vertebral body and pedicle of the 11th thoracic spine, and compressing the dural sac. The patient was gradually improved after surgical removal of the lesions and the histologic findings were characteristics of hemangiopericytoma.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.284-285
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• 2012

레저선박 중 하나인 8톤급 낚시선박에 대한 설계에 앞서, 우수한 복원성을 가지기 위해서는 실해역에 가장 적합한 선형의 개발이 중요하다. 특히 선행되어야 할 것은 선박의 운동 중 횡요 운동이 선박의 안전성 및 승선감에 미치는 영향에 대한 평가라 할 수 있다. 본 논문에서는 모형선 시험 중 전통적으로 사용되는 경사시험, 자유 횡요 시험 및 GZ 곡선을 통하여 기존선형과 대상선형에 대한 횡요 감쇠효과 및 복원성 평가를 수행하였다. 그리고 선형개선에 따른 GM계산 및 횡요운동 주기와 복원성 조사를 통해 낚시선박의 안전성과 승객의 승선감에 대한 영향을 조사하였다. 특히 자유횡요시험 시, 비접촉식 6자유도 운동계측기(Rodym DMM)와 무선 경사계를 이용한 계측 두 가지 방법을 함께 수행함으로서 횡요감쇠효과에 대한 신뢰도를 높였고 그 결과 기존 선형보다 대상 선형에 의한 감쇠효과가 더 크게 나타남을 확인할 수 있었다. 따라서 개선된 대상선형의 GZ곡선을 이용하여 설계시 적합한 복원성을 조사하였으며 자유횡요시험을 통하여 횡요주기가 증가함으로서 대상선형의 승선감이 더욱 향상된 것으로 분석되었다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2253_2254
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• 2009

무선 모바일 통신 시장의 성장에 따라 수동 소자로 구성된 모듈에 대한 관심이 높아지고 있다. 본 논문에서는 수동소자를 이용한 Wi-MAX용 트리플렉서를 설계하였다. 트리플렉서는 Wi-MAX의 RF Front-end단 앞부분에 연결되며, IEEE 802.16에 따른 2GHz, 3GHz, 5GHz 대역을 선택, 분리해주는 역할을 한다. 제안된 트리플렉서는 저역통과필터, 대역통과필터, 고역통과필터로 구성하였으며, 수동소자의 최소화로 인해 삽입손실 향상을 중점으로 설계하였다. 회로해석 결과, 각 대역별 (2/3/5GHz) 삽입손실은 각각 -0.5dB, -0.6dB, -0.4dB 였으며, 반사손실은 -20dB, -20dB, -12dB, 격리도는 -20dB, -24dB, -25dB의 특성을 보였다. 수동 소자의 최소화 설계로 인해 모듈 및 시스템의 저가화를 기대할 수 있다.

• Journal of Chest Surgery
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• v.38 no.1 s.246
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• pp.80-83
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• 2005

A 43-year-old male was admitted to our hospital complaining of dyspnea and wheezing sound at respiration. He had received esophageal exclusion and esophagogastrostomy due to spontanous esophageal rupture 1-year ago. Chest computed tomography revealed esophageal mucocele like that of mediastinal tumor. Trachea is compressed by esophageal mucocele. The operation was performed by resection of thoracic esophagus through right open thoracotomy. Herein we report a case of a tracheal compression by esophageal mucocele after surgical exclusion of the esophagus.

• Microbiology and Biotechnology Letters
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• v.20 no.4
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• pp.401-408
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• 1992

The extracellular cholesterol oxidase produced from a soil microorganism HSL613 was purified and partially characterized. Through a series of purification procedures including concentration with CH2 concentrator, DEAE-cellulose column chromatography and gel filtration on Superose12, the purified enzyme was shown to have a specific activity of 108 units/mg protein giving 30.8-fold purification and final yield of 66%. The molecular weight of the enzyme was estimated to be 59,500 daltons by SDS-PAGE. The optimum temperature and pH for this enzyme were $50^{\circ}C$ and 6.0, respectively. The activity of the purified cholesterol oxidase was inhibited by $Ag^{2+}$, $Hg^{2+}$ and SDS.