Unilateral Diaphragm Paralysis Associated With Neurosyphilis: A Case Report

허성철,정재헌,고현윤,Hyun-Yoon Ko 대한재활의학회 2020 Annals of Rehabilitation Medicine Vol.44 No.4

Diaphragm dysfunction can originate from various etiologies, and bilaterality of the dysfunction depends on the cause. Symptoms of diaphragm dysfunction vary depending on the degree of phrenic nerve denervation, spinal cord lesion, and involvement of the diaphragm. Several infectious diaphragmatic dysfunctions have been reported, including the human immunodeficiency virus, poliovirus, West Nile virus, and dengue virus. Here, we report a case of unilateral diaphragm paralysis in a 34-year-old man with neurosyphilis.

보강재를 가진 외팔평판의 모델링 및 진동해석 ( Modeling and Vibration of Cantilever Plates with Stiffeners )

허성철,유홍희 대한기계학회 1999 대한기계학회 춘추학술대회 Vol.- No.-

PDP 투명유전체 형성용 Green Sheet 제조

허성철,최덕균,오영제 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.4

To fabricate green sheet of transparent dielectric for PDP front panel, dispersion of transparent dielectric slurry, density and mechanical properties of green sheets have been investigated as a function of amount and composition of organic additives. Measurements of sedimentation and viscosity were employed to determine a proper dispersant and its amount for a well dispersed transparent dielectric powders in non-aqueous system. Green sheets, having various ratios of transparent dielectric powders to transparent dielectric powders+ binder+ plasticizer and binder to binder+ plasticizer, were fabricated. All the tape casting slurries showed shear thinning effect, that is, the apparent viscosity decreased with the increase of shear rate. It was found that the amount and composition of organic additives were main variables to affect densities and mechanical properties of transparent dielectric green sheets for PDP

충격함수를 이용한 사각평판 보강재의 모델링 및 진동 해석

허성철,유홍희 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.5

금속판 고정술을 이용한 하부경추부 전방접근법의 임상적 고찰

허성철,임준섭,윤경식,조한호,오민석 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.10

The surgical approach to the lower cervical lesions, especially in traumatic injuries, has been controversial. Some authors advocated posterior fusion for such lesions, while others disagreed and reported good operative results with anterior approach using several types of cervical plates. We analysed 28 patients with lower cervical spine traumatic as well as pathological lesions who underwent 32 anterior surgical interventions with cervical plates during the period of August, 1991 and December, 1993. A successful postoperative vertebral stability was obtained in 25 patients(89.3%) and in 19 patients(87.5%) who had predominent posterior ligamentous injuries. Serious complications such as esophageal perforation and postoperative angulation were seen in 5 patients(17.3%) that were related to the process of reduction. With our clinical experiences, we support anterior fusion with cervical plates particularly for lower cervical lesions even though posterior fusion has been preferred for traumatic posterior ligamentous complex injuries.

Pharmacotherapy Prescription Trends for Cognitive-Behavioral Disorder in Patients With Brain Injury in Korea

허성철,김태완,양정현,문명훈,김수연,고현윤 대한재활의학회 2018 Annals of Rehabilitation Medicine Vol.42 No.1

Objective To investigate the current status of pharmacotherapy prescribed by physiatrists in Korea for cognitive-behavioral disorder. Methods A cross-sectional study was performed by mailing questionnaires to 289 physiatrists working at teaching hospitals. Items on the questionnaire evaluated prescribing patterns of 16 drugs related to cognitive-behavioral therapy, the status of combination pharmacotherapy, and tools for assessing target symptoms. Results Fifty physiatrists (17.3%) including 24 (48%) specializing in neurorehabilitation completed the questionnaires. The most common target symptom was attention deficit (29.5%). Donepezil and methylphenidate (96.0%) were the most frequently prescribed drugs for cognitive-behavioral improvement. Mostly, a combination of two drugs was prescribed (38.0%), and the most common combination therapy included donepezil plus methylphenidate (19.1%). Pharmacotherapy for cognitive-behavioral disorder after brain injury was typically initiated within 2 months (69.5%). A follow-up assessment was usually performed at 1 month after treatment initiation (31.0%). The most common reason for treatment discontinuation was improvement of target symptoms (37.8%). The duration of pharmacotherapy was 3–12 months (57.7%), 1–2 years (17.9%), or 1–2 months (13.6%). Conclusion According to the survey, combination pharmacotherapy is preferred to monotherapy for the treatment of cognitive-behavioral disorder in patients with brain injury. Physiatrists expressed diverse views on the definition of target symptoms, prescribing patterns, and the status of drug combination therapy. Guidelines are needed for cognitive-behavioral pharmacotherapy. Further research should investigate drug costs and aim to reduce polypharmacy and adverse drug reactions.

초분광 영상 융합을 이용한 종양인식

허성철,김인택 대한전자공학회 2006 電子工學會論文誌-SC (System and control) Vol.43 No.4

This paper presents a method for detecting tumors on chicken carcasses by fusion of hyperspectral fluorescence and reflectance images. Classification of normal skin and tumor is performed by the image obtained from optimal band ratio which minimizes the overlapping area of PDFs for normal skin and tumor. This method yields four feature images, each of them represents the ratio of two intensity values from a pixel. Classification is achieved by applying ISODATA to each pixel from the feature images. For the analysis of reflectance image, band selection method is proposed based on the information quantity, many effective features are acquired for the classification by defining the linear transformation selecting the projection axis, accordingly, accurate interpretation of images is possible in the reflectance image and automatic feature selection method is realized. Feature images from reflectance images are also classified by ISODATA and combined with the result from fluorescence images. Experimental result indicates that improved performance in term of reducing false detection rate is observed. 본 논문에서는 초분광 형광영상과 반사영상 융합을 이용한 닭의 종양인식방법을 제안하였다. 형광영상에 밴드비율을 적용하여 피부의 정상과 종양부분을 구분한다. 이를 위해 각각 부분의 확률밀도함수의 중첩된 면적을 최소화하는 방법을 사용하였다. 이 방법으로 획득한 4 개의 특징영상에 분할-합병법을 적용하여 형광영상 분류결과를 얻었다. 반사영상 분석에서는 단일 밴드가 정보량에 주는 영향에 근거하여 밴드 선택 방법을 제안하였다. 학습데이터에 의해 투영 축을 선택하는 선형변환을 정의함으로써 영상분류에 효과적인 많은 특징을 확보하였다. 이에 따라 반사영상에서도 세밀한 영상의 해석이 가능하였고 특징 선택의 자동화를 실현하였다. 반사영상에서 획득한 특징영상도 분할-합병법으로 분류하였으며 형광영상의 분류결과와 융합하여 종양을 인식하였다. 모의실험을 통해 제안한 방법은 기존의 방법에 비해 오인식이 낮음을 확인하였다.

원전수출 강국 실현을 위한 기술 발전방안

허성철,Heo, Seong-Cheol 대한전기협회 2010 전기저널 Vol.- No.406

주성분 변환을 이용한 하이퍼스펙트럴 영상 압축

許成哲,金仁澤 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-

This paper presents a method for compression hyperspectral images. A compression system built on this concept can obtain high compression rate and low information loss. Band images are extracted first from the hyperspectral data. Next these band images are stacked by order of wavelength and form a stack image, and obtain column vectors from the stack image. We transform this column vectors to obtain principal-component vectors by using PCT according to given number of principal component, and the obtained principal-component vectors become compression data. Reconstruction proceed with inverse PCT.

성문상부후두절제술 후 흡인에 영향을 주는 인자

허성철,최승효,최승호,김상윤,남순열 대한이비인후과학회 2003 대한이비인후과학회지 두경부외과학 Vol.46 No.1

Background and Objectives:Supraglottic laryngectomy is a well established technique for the treatment of appropriate carci-noma of supraglottic larynx. The purpose of this study was to determine factors that may contribute to postoperative aspiration related to deglutition problem following supraglottic laryngectomy. Materials and Method:A retrospective analysis of medical records of 19 patients who consecutively underwent supraglottic laryngectomy was undertaken. Contribution of the following factors was investigated:age, T stage, pack-years of smoking, and parameters of pulmonary function test. The authors used a computerized acoustic analysis program (CSL-MDVP) to measure fundamental frequency, jitter, shimer, and noise to harmonics ratio. Results:derate problem in postoperative 6 months. A greater number of pack-years of smoking and decreasing FEV1/FVC were signi-ficantly corelated with poor outcome with regards to postoperative aspiration and deglutition problem. No statistically significant difference was sen betwen patients with supraglottic laryngectomy and the control group. Conclusion:This study showed that less than 60% FEV1/FVC signifies a greater risk for postoperative aspiration. (Korean J Otolaryngol 2003 ;46 :59-62)