• 한국임상수의학회지
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• 제16권1호
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• pp.199-202
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• 1999

In a 10-year old mixed dog, a $10{\times}10{\times}4$ cm mass was palpated around the left caudal thoracic mammary gland with abdomen expension. In hormonal assay, serum concentrate of progesterone was 0 pg/ml and serum concentrate of estradiol was 66.7 pg/ml. Radiological finding of the mammary gland showed higher density than that of soft tissue and ultrasonographic finding showed inhomogeneous in echogenicity. Light microscopic view of mammary gland showed neoplastic hyperplasia of epithelial and myoepithelial cells and showed some metaplastic lesion of these cells to cartilage or bone tissues with metastasis to the lung. This case was diagnosed as malignant mixed mammary tumor.

• Journal of Chest Surgery
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• 제20권1호
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• pp.195-198
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• 1987

We experienced a case of esophageal leiomyoma recently in department of Thoracic and Cardiovascular Surg., Pusan Baik Hospital, Inje Medical College. Patient had suffered from dysphagia and chest discomfort for 2 years. The esophagogram showed an ovoid smooth filling defect in lower portion of the esophagus, mucosal fold of esophagus was not destroyed. A benign intramural tumor of the esophagus such as leiomyoma was suspected with X-ray finding and clinical features. Open thoracotomy was performed through the left 8th intercostal space. A firm egg sized mass in the well of lower esophagus was enucleated by blunt dissection with caution to avoid injury of the mucosa of the esophagus. The diagnosis of leiomyoma was confirmed with histopathological finding. Postoperative course was uneventful.

• 대한두경부종양학회지
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• 제27권1호
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• pp.77-79
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• 2011

Tracheal diverticulum is very rare, that is usually an incidental finding at routine chest computed tomography scan. Differential diagnosis of tracheal diverticulum includes pharyngocele, laryngocele, Zenker diverticulum, apical lung hernia, blebs and bulla, and pneumomediastinum. Treatment options can be devided into medical and surgical. The majority of patients is asymptomatic and requires no specific intervention. We experienced one case of tracheal diverticulum in patient with tongue cancer and report it with reviews of literature.

• Journal of Chest Surgery
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• 제24권10호
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• pp.1024-1027
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• 1991

We experienced a case of giant cell tumor arising from the right 2nd rib in the diagnostic and therapeutic thoracotomy at our department of Thoracic and Cardiovascular Surgery, Chungnam Univ. Hospital in May 3rd, 1991. The reports of this tumor are very rare and are known to have the incidence of 1 percent or less of all giant cell bone tumor. The tumor of the right 2nd rib, infant head-sized, covered with parietal pleura was invaded into the vertebra on operation finding. The tumor was resected partially[three fourths] and revealed to be the giant cell tumor on pathologic finding. At now, the patient is taking the radiotherapy to achieve the therapeutic goal to the remnant tumor.

• 대한후두음성언어의학회지
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• 제10권2호
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• pp.149-153
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• 1999

Relapsing polychondritis is an uncommon disorder of unknown etiology. That involves multisystem characterized by recurrent inflammation, degenerative change of multiple cartilaginous structures. The most common clinical manifestation is an auricular chondritis. Other involving systems are joint, nose, eye, larynx, trachea, aorta, heart and kidney. A 26-year-old man who complained of hoarseness and sore throat was referred to the ENT department from internal medicine department. On initial video-laryngoscopic and radiologic examination, there was no abnormal finding. Treatment with high doses of corticosteroid and methotrexate was not effective. Symptoms were aggrevated with dyspnea. Three months later, on video-laryngoscopic examination, bilateral cord fixation with swelling was noted. The radiologic finding showed subglottic stenosis due to collapse of anterior wall of cricoid cartilage. The condition was managed with tracheotomy. We report a case of relapsing polychondritis involving larynx and trachea with bilateral vocal cord palsy which was managed with tracheotomy.

• Journal of Korean Neurosurgical Society
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• 제47권2호
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• pp.137-139
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• 2010

A subarachnoid hemorrhage (SAH) associated with negative finding on four-vessel angiography is seen in 5 to 30% of patients with intracranial SAH. A previously silent lesion in the spinal canal may be responsible for the angiographically negative finding for cause of intracranial SAH. We report a case of upper cervical (C1-2) intradural schwannoma presenting with acute intracranial SAH. Repeated cerebral angiographic studies were negative, but cervical magnetic resonance imaging study and tissue pathology revealed a intradural-extramedullary schwannoma in C1-2 level. This case illustrates the importance of a high index of clinical suspicion for spinal disease in angiographically negative intracranial SAH patients.

• Educational Technology International
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• 제7권1호
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• pp.21-37
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• 2006

This paper focuses on finding out visualization process by means of VTA(Visual Task Analysis) of expert teachers' simple task. Findings indicate teachers have coding schema of performing visual task as such; (a) the analyzing by reading and some activities in the task text, (b) conceptualizing or understanding in his/her own way, (c) the explaining of the action or product, (d) the searching by thinking or finding, (e) the decision of visualizing of the task. Expert teachers tried to visualize in the form of abstract graph, and to omit the object which was not directly related to the topic at the pilot study. VAT based on ground theory and protocol analysis was developed and performed. This case study suggests that an additional study for searching a guide and method might be beneficial for conducting a visual task analysis.

• 대한세포병리학회:학술대회논문집
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• 대한세포병리학회 1992년도 제6차 춘계학술대회 초록집
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• pp.18.2-19
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• 1992

• Tuberculosis and Respiratory Diseases
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• 제82권3호
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• pp.261-263
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• 2019

• 대한전자공학회논문지TC
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• 제41권1호
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• pp.35-44
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• 2004

Circulant Matrix Factorization (CMF)는 covariance 행렬의 spectral factorization된 결과를 얻을 수 있다. 우리는 얻어진 결과를 가지고 일반적으로 잘 알려진 방법인 Schur algorithm을 이용하여 finite impulse response (FIR)차 infinite impulse response (IIR) lattice 필터를 설계하는 방법을 제안하였다. CMF는 기존에 많이 사용되는 root finding을 사용하지 않고 covariance Polynomial로부터 minimum phase 특성을 가지는 polynomial을 얻는데 유용한 방법이다. 그리고 Schur algorithm은 toeplitz matrix를 빠르게 Cholesky factorization하기 위한 방법으로 이 방법을 이용하면 FIR/IIR lattice 필터의 계수를 쉽게 찾아낼 수 있다. 본 논문에서는 이러한 방법들을 이용하여 FIR과 IIR lattice 필터의 설계의 계산적인 예제를 제시했으며, 제안된 방법과 다른 기존에 제시되었던 방법 (polynomial root finding과 cepstral deconvolution)들과 성능을 비교 평가하였다.