• The Academic Congress of Korean Shoulder and Elbow Society
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• 2008.03a
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• pp.171-171
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• 2008

발음성 삼두근 증후군은 주관절을 굴곡하거나 신전할 때 삼두근 말단부 일부와 척골 신경이 내상과 전방으로 탈구되는 드문 질환이다. 이학적 검사 만으로는 다른 질환으로 오진되는 경우가 많아 정확한 진단이 필수적이며 확진을 위하여는 척골 신경 및 삼두근의 비정상적인 움직임을 관찰할 수 있는 영상 검사가 필요하다. 초음파 검사는 자기 공명 영상 촬영 등 다른 검사에 비해 간편하고 효과적으로 연부 조직의 동적 검사를 시행할 수 있는 장점이 있다. 저자들은 발음성 삼두근 증후군 환자를 동적 초음파 검사를 사용하여 진단하고 척골 신경 전방 전위술 및 삼두근 내두의 이전술을 시행하여 치유하였기에 문헌 고찰과 함께 초음파 검사의 유용성을 보고하고자 한다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1999.04a
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• pp.27-27
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• 1999

본 연구에서는 초음파 Immersion법을 이용하여 복합재 연소관내에 존재하는 결함을 검출하는 방법에 대하여 연구하였으며, 이를 위하여 FRP의 delamination, FRP-EPDM간의 미접착을 모사한 모의 결함 시편을 제작하여 시험하였다. 먼저 복합재료에 대한 초음파 시험방법을 최적화하기 위하여 가장 검출 감도가 좋은 탐촉자의 적용 주파수조건 및 물거리를 구하였으며, 이들 최적 조건으로 모의 결함 시편을 A, B, C-Scan하여 결함을 검출 분석하였다. 그리고 시험 자료를 바탕으로 데이터 값을 분석함으로써 복합재료에서의 음파 속도, 음향 임피던스, 반사율 및 투과율 등 복합재료의 초음파 특성을 산출하였으며, 동 시편에 대한 X-ray 필름을 촬영하여 그 결과를 초음파 시험 결과와 비교 분석하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.11
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• pp.2382-2387
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• 2012

In this paper, we propose a new method to extract and analyze appendicitis from abdomen ultrasonographic image in order to measure the thickness of appendix and change of inflammation correctly. Since the ultrasonographic image has environmental effect in nature, we standardize the image first and the process of extracting appendicitis then extracts the bottom facia which has the critical role to find appendix area. The experiment with real appendicitis patient verifies that the proposed method is more effective than current field expert's naked eye inspection.

• Journal of the Korean Society of Propulsion Engineers
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• v.24 no.6
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• pp.53-60
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• 2020

In liquid-fuel spray combustion, an experimental study was conducted to observe the effect of ultrasonic excitation on the ultrasonically-atomized liquid fuel flame by controlling pressure field through an ultrasonic standing wave. Flame of the ultrasonically-atomized kerosene aerosol was visualized by using a high speed camera, DSLR, and Schlieren photography. The amount of fuel consumed was obtained by a precise flow-rate measurement technique during combustion, through which the ratio of carrier gas (air) to fuel mass was able to be obtained, too. As a result, it could be found that the combustion reaction-rate of the liquid-fuel aerosol was increased by applying an ultrasonic standing wave to the secondary flame zone of the flame.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.186-188
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• 2021

본 논문에서는 초음파 영상에서 DBSCAN(Density-based spatial clustering of applications with noise)과 FCM 클러스터링 기반 양자화 기법을 적용하여 결절종을 추출하는 방법을 제안한다. 본 논문에서는 초음파 영상 촬영 시 좌우 상단의 지방층 영역과 하단 영역의 명암도가 어두운 영역을 잡음 영역으로 설정한다. 그리고 초음파 영상에 퍼지스트레칭 기법을 적용하여 잡음 영역을 최대한 제거 한 후에 ROI 영역을 추출한다. 추출된 ROI 영역에서 밀도 분포를 분석하기 위하여 히스토그램을 분석한 후에 DBSCAN을 적용하여 초음파 영상에서 결절종 후보에 해당되는 명암도를 추출한다. 추출한 후보 명암도를 대상으로 FCM 클러스터링 기법을 적용한다. FCM을 적용하는 단계에서 결절종의 저에코 혹은 무에코의 특징을 이용하여 클러스터 중심 값이 가장 낮은 클러스터를 양자화 한 후에 라벨링 기법을 적용시켜 결절종의 후보 객체를 추출한다. 제안된 결절종 추출 방법의 성능을 분석하기 위해 전문의가 결절종 영역을 표기한 초음파 영상과 표기되지 않은 초음파 영상 120쌍을 대상으로 DBSCAN, FCM, 그리고 제안된 방법 간의 성능을 비교 분석하였다. 제안된 방법에서는 120개의 초음파 영상에서 106개 결절종 영역이 추출되었고 FCM 기법에서는 80개가 추출되었고 DBSCAN에서는 36개가 추출되었다. 따라서 제안된 방법이 결절종 추출에 효율적인 것을 확인하였다.

• 대한예방의학회:학술대회논문집
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• 2001.10a
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• pp.226-227
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• 2001

• Journal of the Korean Institute of Telematics and Electronics
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• v.18 no.2
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• pp.54-63
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• 1981

An ultrasonic imaging system with fan reflection mode time of fight is developed and its performance has been examined by system implementation. Experimental results obtained indicafe potential of the method for tomographic imaging. The basic concept of this method is reconstruction of reflectivity with reflection data collected in fan mode using a new "arbitrary ray" reconstruction algorithm. Computer simulations as well as experimental results are presented.presented.

• Journal of Veterinary Clinics
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• v.22 no.2
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• pp.148-152
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• 2005

An intact female, 5-year-old, Pekingese, weighing 3.5kg with a history of a palpated abdominal mass was referred to Veterinary Medical Teaching Hospital, Seoul National University. In laboratory examination, there were no remarkable abnormalities. Radiographic findings included a left mid-abdominal mass with ill-defined margin, serosal detail loss of peritoneal space, non-uniform opacity of retroperitoneal space, and a radiopaque cystic calculus. On abdominal ultrasonography, a heterogeneous parenchymal mass with irregular contour in the left renal region was found. Computed tomographic findings showed a tumor embolus within the caudal vena cava and an invasion into mesentery, small bowel loops, spleen and pancreas around the large left renal mass. Unilateral nephroureterectomy was performed. Histopathologic examination of the resected mass confirmed the diagnosis of renal cell carcinoma. The dog died one day after surgery. Although ultrasonography could give diagnostic information about mass characteristics, computed tomography (CT) can provide key imaging features of mass characteristics.

• Journal of the Korean Society of Radiology
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• v.5 no.2
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• pp.81-92
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• 2011

This study was carried out to improve service efficiency and to cope with a emergency situation in emergency radiography, through analysis of the radiographic distriution and literature cited about emergency care. Data collection of radiographic distribution was surveyed for 1270 emergency outpatients who visit during JAN, 2009at ER of the general hospital in Gwang city. The results is as follows : Emergency radiography rate of simple radiography was 56.6%, special radiography 2. 5%, CT 34.2%, and ultrasonography 6.7%, In simple radiography rate. a high rate was distributed on male(63.6%), thoracicsurgery part(90.0%), admission patient(77.9%), and long stayed patient at ER. In special raiography rate, a high rate was obsurved in urologic part(28.6%), and in CT rate, observed neurosurgerty part(49.2%) and neurologic part(36.7%). Ultrasonography rate was high for female(8.8%) and internal medicine part(15.9%). There are distributed regional radiography rate in radio-graphic type that chest(55.3%) is high in the simple radiography, urinary system(1.2%) in the special study, and brain(40.0%) in the CT. Regional radiography rate according to diagnostic department also was showed highly for head(64.6%) in neuro surgery, chest(90.0%) in thoracic surgery, abdomen(58.0%) in general surgery, spine(40.0%) in neuro surgery, and pelvis(15.9%), upper extrimity(20.5%), and lower extrimity(31.8%) in orthopedic surgery each. Mean radiographic case number per patient of simple radiography was sinificant on sex, age, transfer relation in both total and radiopraphic patients(p<0.05). Mean radiographic case number was highly distributed on male(2.2 case number) in sex, on thirties(2.7) in age, transferred patient(2.7) in patient type, and on nurosurgery(3.4) in diagnostic charged part. Total radiographic case number in regional party was highly distributed on chest(998 case number.) Considering the above results, emergency radiographer should take care of the elder patient in emergency radiography and get hold of injury mechanism to decrease possible secondary injury during radiography. Because of high radiography rate of urinary system in special study, related instrument. All radiographer who take charge emergency patient should cope with a emergency situation during radiography. Because head trauma patients is very important in patient care, especilly in CT at night, charged doctor should be always sitted with CT room and monitoring patient. Radiography was reqested by many diagnostic department in ER. Considering that rate of simple radiography is high, special room for emergency radiopraphy should be established in ER area, and the radioprapher of this room should be stationed radiologic technician who is career and can implement emergency patient care and The disposition of men which is appropriate with emergency patient increase is necessary.

• Journal of the Korean Society of Propulsion Engineers
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• v.16 no.2
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• pp.65-72
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• 2012

A defect analysis program for a composite motor case was developed to apply the ultrasonic signal processing method, based on the ultrasonic pulse-echo method. With the proposed defect analysis program, defects of FRP delamination and FRP/Rubber disbond in the composite motor case could be quantitatively measured. The defects detected in the composite motor case were in good agreement with the results measured with the computed tomography and video microscope. This paper described the development process of the defect analysis program to convert the ultrasonic test data into the C-Scan images.