• Journal of Chest Surgery
• /
• v.36 no.1
• /
• pp.39-42
• /
• 2003

Endobronchial lipomas are rare benign tumors that arise from the lung. They partially or totally obstruct the bronchial lumen, producing a variable degree of collapse, irreversible bronchiectasis, and pulmonary damage. Although bronchoscope, CT and MR are reported to be helpful in establishing the diagnosis, CT is highly specific and sensitive in detecting fatty tumor. They may be removed by endoscope or thoracotomy or lobectomy. We present a case of endobronchial lipoma completely obstructing the right middle lobe and postobstructive irreversible pulmonary change with review of literatures.

• Journal of Powder Materials
• /
• v.14 no.6
• /
• pp.380-385
• /
• 2007

Characteristics of Al-based composites with waste stainless steel short fiber, fabricated by magnetic pulsed compaction and sintering were investigated. The compacts prepared by magnetic pulsed compaction showed high relative density and homogeneous microstructure compared with that by conventional press compaction. The relative density of sintered composites at $430^{\circ}C$ for 1 h exhibited the same value with compacts and decreased with increase in STS short fiber content. The reaction between Al and STS phase was confirmed by the microstructural analysis using EDS. The sintered composites, prepared by magnetic pulsed compaction, showed increased hardness value with increasing STS fiber content. Maximum yield strength of 100 MPa and tensile strength of 232 MPa were registered in the AI-based composite with 30 vol% STS short fiber.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.06a
• /
• pp.352-352
• /
• 2008

폐 자기회로 구조를 갖는 Meander 형태의 Inductor 설계를 위해 HFSS 프로그램을 이용하여 Meander Inductor를 시뮬레이션 하였다. Meander Inductor의 turn 수(N) 및 폭(W), 두께(T), 랩(G)의 변화에 따른 인덕턴스(L), S-parameter(S)와 Q-factor(Q)의 변화를 HFSS 를 통해 측정하였다. Al2O3 기판과 MgO의 두께는 각각 680um, 50um로 고정하였고, silver electrode를 이용하여 Meander 타입의 Inductor를 설계하였다. Meander Inductor의 turn수(6,7,8turn)의 변화를 측정한 결과, 8턴이었을 때 Q-factor가 19로서 가장 높은 결과를 얻었다. L의 결과 값은 공진 주파수와 의 관계에 의해 6turn일 때 L값은 17GHz에서 공진현상이 나타났다. 또한 W, G, T에 변화를 주어 설계한 뒤 시뮬레이션의 결과 값을 측정하였다. 그 값을 서로 비교한 결과, 변수들의 변화에 따라 L값과 Q-factor가 변화되었다. 이 논문에서는 각 변수에 따른 meander inductor의 특성을 HFSS 시뮬레이션을 통해 비교하고자 한다.

• Korean Architects
• /
• s.600
• /
• pp.112-117
• /
• 2019

1974년 10월 '월간 건축사'에 글이 하나 실렸다. 건축 작품이 정치사회적 논쟁의 중심에 섰던 최초이자 마지막이 아니었던가 싶은 김수근의 <부여 박물관>에 대한 일본풍 논쟁이었다. 논쟁의 발단은 한참 선배인 김중업의 언급에서 시작됐다. 한국 현대 건축의 시작점에서 프랭크 로이드 라이트를 일본을 거쳐 배운 김수근과 유럽의 르 코르뷔지에 말년 3년을 같이 한 김중업의 논쟁이었다. 일본풍은 <왜색>이라는 자극적 표현 때문에, 독립된 지 얼마 안 된 우리 정서로는 매우 민감한 부분이었고 사회적으로 파란이 일었다. 여러 사람들이 논쟁에 가담했었는데, 이런 논쟁이 단 몇 차례로 끝나고 이어지지 않은 것은 우리 건축계를 위해선 안타까운 일이었다. 600호 특집을 준비하다 발견한 <월간 건축사 1974년 10월호> 글은 놀라웠다. 그리고 1974년의 통렬한 비판이 아니라 지금까지도 언급할 가치가 있는 내용이었다. 자그마치 45년 전 건축계 전체에 대한 발전을 촉구하는 글에서 지금을 생각하게 됐다. 특히 두 '귀화인'이라는 표현에서 여전히 자기 정체성을 확보하지 못한 대한민국 건축계에 울리는 소리가 크다. 여전히 직수입된 사고와 생각을 유행매체에 마케팅하는 전략이 먹히는 풍토에서 이 글은 반성의 시간을 가지게 만든다. 피터 춤토르가 스위스 산속에서 혼자 뚝딱거리면서 조용히 건축을 하고, 중국에서 왕 슈는 폐자재로 수공예하는 건축을 하다 세계에 존재감을 알리게 되고, 알렉한드로 아라베나는 빈민주택으로 사회적 정체성을 알렸다. 해외대학 이력이 국내 대학보다 활동하기 좋은 대한민국 건축계는 반성의 시간을 가져야 할 것 같았다. 과연 45년 전 보다 선명해 졌는가? 원문을 거의 그대로 옮긴다. 다만 한자 표현이나 이해 어려운 문장은 다소 변환했다. 천천히 음미하면서 읽어보시길${\ldots}$ 1974년 10월 두 귀화인의 논쟁에 대한 학문적 비판글.

• Journal of the Korean Society of Radiology
• /
• v.84 no.2
• /
• pp.372-385
• /
• 2023

Breast cancer is one of the most common cancers and causes several complications in females. Currently, MRI is a necessary method for preoperative studies in patients with breast cancer. A high frequency of breast MRI can lead to an increase in the number of incidental extramammary findings. Moreover, it can provide accurate preoperative workup; therefore, the prognosis of patients can be improved. Herein, we provide several extramammary findings, including the mediastinum, lung, upper abdomen, bone, and soft tissue, correlating with US, chest CT, liver MRI, PET-CT, and bone scan.

• Archives of design research
• /
• v.19 no.5 s.67
• /
• pp.17-30
• /
• 2006

The early Joseon Dynasty is very important period of studying about Korean history of ceramics because various kinds of porcelain were produced like celadon, brown porcelain, white porcelain, inlaid white porcelain, blue porcelain etc, $\ulcorner$sejongsilrok$\lrcorner$ $\ulcorner$Jiriji$\lrcorner$ was published and Saongwon established its branch. Moreover, there also had a sudden political change to Joseon Dynasty, so ceramic industry in Gangjin was closed and artisans in Gangjin scattered to find safer place. One of these place was Imiwueri and Chuhyunri, Joongmohyun in Sangju.(the name of the place in that times, now Modongmyun) Also, Sangju in Gyeongsangbuk-Do is one of the places where can get materials for producing white porcelain, so artisans in Gangjin could migrate to the place during change of regime to Joseon Dynasty which based on Sung Confucianism. In $\ulcorner$Tejongsilrok$\lrcorner$, it mentioned specific areas like Joongmo, Hwaryeong in Sangju, Gyeongsang-Do and we can find out about situations of ceramic production in the early 15 centuries with producing dishes for a Royal family. $\ulcorner$Sejongsilrok$\lrcorner$ $\ulcorner$Jiriji$\lrcorner$ mentioned Imiwueri and Chuhyunri and Sangju produced the half of porcelains. In $\ulcorner$Gyeongsangdojiriji$\lrcorner$, Sangju takes charge of 8 spots which is one third of ceramic production. $\ulcorner$Gyeongsangdojiriji$\lrcorner$ and $\ulcorner$Sejongsilrok$\lrcorner$ $\ulcorner$Jiriji$\lrcorner$ were published with same goals at the same year. In $\ulcorner$Gyeongsangdosokchanjiriji$\lrcorner$, there was deleted nine spots which included high, middle, low level compared with $\ulcorner$Seiongsilrok$\lrcorner$ $\ulcorner$Jiriji$\lrcorner$, and in $\ulcorner$Donggukyeojiseungram$\lrcorner$ there was entirely deleted the locations of porcelain spots and potteries.

• Journal of Yeungnam Medical Science
• /
• v.11 no.2
• /
• pp.248-261
• /
• 1994

This study was undertaken to evaluate the clinical usefulness of magnetic motor evoked potential (MEP) in the diagnosis of stroke and predicting the motor improvement following stroke. The cortical, cervical and lumbar stimulations were performed in the case of 24 healthy controls and 24 ischemic stroke patients. The central motor conduction time (CMCT) was represented by the difference of latency to a target muscle between after transcranial stimulation and after cervical or lumbar stimulation. There was no case showing no response in controls. But in 11 out of 24 ischemic patients, we could not get cortical MEP. Mean CMCT of abductor pollicis brevis muscle was not significantly different in controls and stroke patients in whom MEPs were recorded. There were significant differences between mean CMCT of normal controls and that of stroke patients showing MEPs in AH Muscle. MEP Results from testing the stroke patients were correlated with site of lesion, degree of motor weakness and motor improvement after 1 to 2 months. These results suggest that magnetic MEP is easy and useful in electrophysiological test of central motor pathway and is useful indicator for representing the motor weakness and predicting the motor outcome in acute ischemic stroke patients.

• Progress in Medical Physics
• /
• v.25 no.2
• /
• pp.72-78
• /
• 2014

The aim of the study is to test a hypothesis that quasi-breath-hold (QBH) biofeedback improves the residual respiratory motion management in gated 3D thoracic MR imaging, reducing respiratory motion artifacts with insignificant acquisition time alteration. To test the hypothesis five healthy human subjects underwent two gated MR imaging studies based on a T2 weighted SPACE MR pulse sequence using a respiratory navigator of a 3T Siemens MRI: one under free breathing and the other under QBH biofeedback breathing. The QBH biofeedback system utilized the external marker position on the abdomen obtained with an RPM system (Real-time Position Management, Varian) to audio-visually guide a human subject for 2s breath-hold at 90% exhalation position in each respiratory cycle. The improvement in the upper liver breath-hold motion reproducibility within the gating window using the QBH biofeedback system has been assessed for a group of volunteers. We assessed the residual respiratory motion management within the gating window and respiratory motion artifacts in 3D thoracic MRI both with/without QBH biofeedback. In addition, the RMSE (root mean square error) of abdominal displacement has been investigated. The QBH biofeedback reduced the residual upper liver motion within the gating window during MR acquisitions (~6 minutes) compared to that for free breathing, resulting in the reduction of respiratory motion artifacts in lung and liver of gated 3D thoracic MR images. The abdominal motion reduction in the gated window was consistent with the residual motion reduction of the diaphragm with QBH biofeedback. Consequently, average RMSE (root mean square error) of abdominal displacement obtained from the RPM has been also reduced from 2.0 mm of free breathing to 0.7 mm of QBH biofeedback breathing over the entire cycle (67% reduction, p-value=0.02) and from 1.7 mm of free breathing to 0.7 mm of QBH biofeedback breathing in the gated window (58% reduction, p-value=0.14). The average baseline drift obtained using a linear fit was reduced from 5.5 mm/min with free breathing to 0.6 mm/min (89% reduction, p-value=0.017) with QBH biofeedback. The study demonstrated that the QBH biofeedback improved the upper liver breath-hold motion reproducibility during the gated 3D thoracic MR imaging. This system can provide clinically applicable motion management of the internal anatomy for gated medical imaging as well as gated radiotherapy.

• Tuberculosis and Respiratory Diseases
• /
• v.40 no.1
• /
• pp.58-66
• /
• 1993

Mucoepidermoid carcinoma of the lung can be divided into low grade and high grade varieties, like their major salivary glands counterparts. This carcinoma comprises only. about 0.5% of all pulmonary neoplasma. Their clinical and biologic behaviors are closely related with histologic grade of carcinoma. We have experienced two cases of mucoepidermoid carcinoma. Case 1 occurred in a 16 years old male and showed the histologic features of low grade type. This carcinoma arised from the right upper lobe bronchus which was removed by the right upper lobectomy. Case 2 occurred in a 41 year old male was the high grade carcinoma located at the distal left main bronchus which was removed by the left pnemonectomy.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.28 no.1
• /
• pp.9-15
• /
• 2008

A new ECT probe to separate the ECT signal distortion due to PVC (permeability variation clusters) and ordinary defects created in SG tubes has been developed. The hystersis loops of PVC which are extracted from retired SG (steam generator) tubes of Kori-1 NNP were measured. The tensile tests were performed to identify the mechanism of PVC creation. The conditions detecting the PVC created in 56 tubes were investigated using computer simulation, and the signal processing circuits were inserted in the probe for the digital signal transmission. The new Probe can measure and separate the PVC signal which is created in the SG tubes, and also measures the defects in Ni-sleeving part of SG tubes. furthermore the new ECT probe can measure the defects as fast as bobbin probe, and enhance the testing speed as well as reliability of the defect detection of SG tubes.