의료기기 전자파적합성(EMC) 표준 동향

윤상욱 한국전자파학회 2019 전자파기술 Vol.30 No.1

젊은 무증상 자원자의 배변조영술 소견

윤상욱 대한영상의학회 1994 대한영상의학회지 Vol.31 No.4

척추강내 신경장관성 낭종의 자기공명영상 소견 : 증례 보고

윤상욱 대한영상의학회 1994 대한영상의학회지 Vol.31 No.4

식도관련증상을 호소하는 환자에 있어서 Marshmallow 덩어리를 이용한 바륨식도 조영술의 유용성

윤상욱 대한영상의학회 1996 대한영상의학회지 Vol.34 No.3

Purpose : To evaluate the usefulness of the esophagogram using marshmallow bolus in the evaluation of thecauses of variable esophageal-related symptoms. Materials and Methods : Esophagograms using marshmallow bolus wereperformed on 44 patients with esophageal-related symptoms and on ten normal volunteers. Videofluoroscopic studieswere also made. Patients were classified into three groups according to their esophageal-related symptoms ; thosewith dysphagia, those with globus symptom, and those with chest pain. Abnormal findings on an esophagogram withmarshmallow were graded into three categories ; mild, moderate, and severe. Provocation of the same symptom wasalso evaluated. Esophageal manometric studies were performed on 16 patients and those results were compared withthe results obtained from the esophagogram using marshmallow bolus. Results : The provocation rate of the samesymptom was 33% in the first group, 47% in the second, and 24% in the third. The provocation rate was highest inthe second group. The provocation rate was also higher in patients with a severe degree of abnormality on anesophagogram using marshmallow bolus. Where there were abnormal findings, an esophagogram using marshmallow bolusshowed a higher abnormality rate than did a conventional esophagogram. In cases showing abnormal findings on theesophageal manometric study, an esophagogram using marshmallow bolus showed a higher provocation rate and moresevere abnormality than in cases showing normal findings on manometric study. Conclusion : An esophagogram usingmarshmallow bolus will a useful radiologic screening modality for the evaluation of patients withesophageal-related symptoms.

CT Findings of Surgically Verified Acute Invasive Small Bowel Anisakiasis Resulting in Small Bowel Obstruction

윤상욱,유정식,박미숙,심정연,김희진,김기황 연세대학교의과대학 2004 Yonsei medical journal Vol.45 No.4

Acute invasive small bowel anisakiasis is an extremely rare cause of small bowel obstruction. The authors report a case of surgically verified small bowel anisakiasis resulting in small bowel obstruction. A 54-year-old man presented with suddenly developed diffuse abdominal pain after ingestion of raw fish. The peripheral blood examination showed leukocytosis without eosinophilia. CT showed a long segment of thickened small bowel accompanied by a focal narrowed portion and combined with ascites. When these findings are noted in patients with a history of recent ingestion of raw or undercooked fish, the diagnosis of small bowel anisakiasis should be considered in order to avoid application of unnecessary surgical treatment, in spite of the severity of the abdominal pain and bowel obstruction.

高速道路 切開地 비탈면의 植生構造 分析

尹相旭,李敏渟,金昌浩 동국대학교 농림과학연구소 1988 農林科學 論文集 Vol.12 No.-

This study was carried out to analyze the vegetational structure of the express highway. Seven sites in roadside slopes of the Kyungboo express highway (the section Pankyo-Shingal) were selected and quadrats of three sizes, 25㎡, 5㎡, 1㎡, were set up for trees, blush, herbs, respectively. The results obtained are as follows; 1) For trees, R. pseudo-acacia showed the most high value, 45%, 39%, respectively in relative density and relative cover. Relative frequency was most high(31%) in P. rigida. Among invading species, Quercus spp. showed the most high value. For blush, Puerarica thunbergiana and Lespedeza bicolor showed very high value in R.D., R.F., and R.C. Arundinella was most high in R.D., R.F., and Miscanthus sinensis in R.C. for herbs. 2) In importance value, R. pseudo-acacia showed very high value over all polt. R. pseudo-acacia also showed markedly high value in phoytograph index, making the highest layer. 3) Species diversity was most high in Plot 2, the community of R. pseudo-acacia - Alnus hirsuta. Plot 1, the community of Quercus spp. - Alnus hirsuta, was most high in evenness. And dominance value was most high in Plot 5, the community of R. pseudo-acacia, showing the most low species diversity.

유방확대성형술후 합병증 진단에 있어서 자기공명영상소견의 가치

윤상욱 대한영상의학회 1995 대한영상의학회지 Vol.32 No.4

Purpose : The objective of augmentation mammoplasty includes reconstruction and cosmesis after breast surgery.lncreasing frequency of the procedure has been related with increased complications. Authors evaluated the valueof breast MRI in the diagnosis of complications after augmentation mammoplasty. Materials and Methods : Authorsstudied 42 breasts of 24 patients, who had undertaken augmentation mammoplasty. We evaluated findings ofmammography, ultrasonography, and breast MRI in all patients. We used variable MRI sequences for better evaluationof implant status. The results were compared with the findings in surgical field. Results : In all imagingstudies, nodule or mass was indentifiable in the cases of interstitial paraffine injection(8 breasts),interstitial silicon injection(7 breasts), and herb medication(2 breasts). However, the differentitation betweenmalignant and benign nodule was only possible at dynamic breast MRI. Mammogram was not helpful in the evaluationof extracapsular rupture in the cases of silastic bag insertion. In sonogram, identification of echogenic materialwas possible, although, false negative and false positive rate were high. MRI was able to visualize contour ofentire implant and it was able to easily recognize low signal internal structure. Conclusion : MRI was the mostaccurate diagnostic tool in the evaluation of the character of the palpable mass after augmentation mammoplastyand early detection of breast implant rupture.

두개강내 종양의 자화전이영상 소견

윤상욱 대한영상의학회 1995 대한영상의학회지 Vol.32 No.4

Purpose : To measure the magnetization transfer ratio(MTR) of intracranial tumors and to evaluate thedifference of the character and the border of tumors on magnetization transfer image. Materials and Methods : Weprospectively reviewed magnetization transfer imaging(MTI) findings of intracranial tumors of 13 patients. 1.0TMRI machine was used. T1 weighted image(TR/TE=700/14) and T1 weighted magnetization transfer image were obtained.The offset and bandwidth of magnetization transfer pulse were 100Hz and 250 Hz, respectively. Postcontrast imageswere also obtained. MRT was measured at lesion area. Results : The mean of normal MTR of white matter and graymatter in 7 normal volunteers were 37% and 29%, respectively. The MTR of each tumor was as follows; metastatictumors(mean 16.3%), meningioma(mean 27.3%), oligodendroglioma(mean 20.2%), glomus jugulare tumor(mean 17.3%),gliomatiosis cerebri(mean 27.0%). The contrast of lesions were better at magnetization transfer image than at T1weighted image. Conclusion : The MTR of the intracranial tumors is lower than normal tissue. Measurement of MTR atmultple areas within the tumor can be useful for evaluation of indistinct border of the tumor.

수리 방법에 따른 복합재 구조물의 인장강도 연구

윤상욱,정문규,박용빈,권진희,최진호,신상준,송민환,송근일 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11

본 논문에서는 수리 방법과 결함크기가 복합재 구조물의 강도에 미치는 영향을 시험으로 연구하였다. 복합재 패치와 접착제의 종류, 결함크기를 달리하여 총 6종류, 30개의 시편에 대해 인장 시험을 수행하였다. 시험 결과, 복합재 패치로 수리된 시편의 파손하중은 건전한 적층판 대비 약 20% 정도 감소하였고 접착제 종류에 따른 영향은 크지 않았다. 유리직물을 사용하여 습식적층방식으로 수리한 경우의 파손하중은 결함이 없는 적층판의 파손하중보다 약 60% 감소하였다. 결함크기에 따른 파손하중의 차이는 발견되지 않았는데, 이것은 수리된 시편이 파손이 주로 결함 바깥 영역에서 인장파손의 형태로 발생하기 때문으로 판단된다. The effect of repairing method and defect size on tensile strength of composite structure was studied. A total of 30 specimens in 6 different types were tested with different composite patches, adhesive types and defect sizes. The results showed that the failure loads of composite patch-repaired specimens decreased approximately 20% compared to that of sound laminate. The effect of adhesive type was not remarkable. Decrease of the failure loads of the specimens repaired by glass fabric wet lay-up process is more serious in around 60%. The effect of defect sizes was negligible because critical failure occurred in the region outside the damage zone in tensile rupture mode.

五臺山 森林植生의 植物社會學的 硏究

尹相旭,金昌浩 동국대학교 농림과학연구소 1989 農林科學 論文集 Vol.13 No.-

This study was carried out to analyze the forest vegetational structure and the topographical distribution of trees in Mt. Odae national park. Eighteen sites, nine sites of the ridge part and nine sites of the glen part, were selected in the experimental forest of Mt. Odae. The result obtained are as follows : 1) Q. mongolica and Carpinus laxiflora showed the most high Importance Value in the ridge part and the glen part, respectively. For herbs, Arudinella hirta showed the most high Summed Dominance Ration in all the area, Festuca ovina the second high ratio in the ridge part, and Matteuccia struthiopteris the second in the glen part. 2) Species Diversity was most high in Plot 9 where was the intersection region of two vegetational types of the arid and the humid. Plot 10, the community of P. densiflora and Plot 16, the community of Carpinus laxiflora were completely different vegetational structure and topographical situation showing Similaraty Index of 0%. 3) As a result of analyzing Importance Values of each tree crown layers, thee age, D. B. H., succession of forest community of the area might be progressed toward Q. mongolica community in the ridge part and Carpinus laxiflora in the glen part for the present.