초기 산업사회의 명암과 그 지양 - 김승옥의 『역사』에 대한 구조적 분석

이승준 ( Lee Seung Jun ) 민족어문학회 2003 어문논집 Vol.48 No.-

미세부품가공을 위한 소형 초고속에어스펀들 개발

이승준,신인동,최수창,김용우,이종렬,이득우,Lee, Seung-Jun,Shin, In-Dong,Cha, Sao-Chang,Kim, Yong-Woo,Lee, Jong-Ryul,Lee, Deug-Woo 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6

The development of high-speed spindle have been studied extensively for micro machining in advanced industrial countries. The research of miniaturized high-speed air spindle is important part which needs for the micro machining process of high quality. So, This study was to carry out results about design characteristics of miniaturized high-speed air spindle. We had designed 4type turbines and shaft. They were simulated in use the computer simulation programs. We made them as products. They measured RPM (revolutions per minute). As a result of experiments, there was a contrast among 4type Turbines. it reached 384,000rpm in 4.5bar of air pressure. And, We tried to compare the results of measurement whit the results of computer simulation.

저 악성도 연골육종으로 악성 변화한 섬유성 이형성증으로 오진하여 치료방침의 오류가 발생한 연골 모세포형 골육종 - 증례 보고 -

이승준,고재수,원호현,전대근,Lee, Seung-Jun,Koh, Jae-Soo,Won, Ho-Hyun,Jeon, Dae-Geun 대한근골격종양학회 2008 대한골관절종양학회지 Vol.14 No.1

Malignant degeneration of fibrous dysplasia is rare and involves transformation into osteosarcoma, fibrosarcoma and chondrosarcoma. The most frequent sites involved in malignant transformation were craniofacial bones, proximal femur, humerus, pelvis, tibia and scapula in a decreasing order of frequency. An 41-year-old man with a history of polyostotic fibrous dysplasia presented with increasing left arm pain. Plain radiograph showed expansile destructive lesion along the humeral shaft. As initial biopsy report was low grade chondrosarcoma, he underwent marginal resection. However, he developed local recurrence 7 month later and subsequent pathologic finding was chondroblastic osteosarcoma. We report one case of secondary chondroblastic osteosarcoma from polyostotic fibrous dysplasia initially misdiagnosed as low grade chondrosarcoma that caused fallacy in treatment strategy. 섬유성 골 이형성증이 골육종, 연골육종, 섬유육종 등으로 악성 변환을 하는 것은 매우 드무나 잘 알려져 있다. 악성 변화가 흔히 일어나는 부위는 두경부, 근위 대퇴골, 상완골, 골반골, 경골, 및 견갑골 순이다. 41세 다발성 섬유성 이형성증 환자가 상완골의 동통을 주소로 내원하였다. 방사선 상 상완골 간부의 골 팽윤 및 파괴를 보였다. 생검 상 저악성도의 연골육종으로 진단하여 변연부 절제를 하였으나 7개월 만에 근위부에서 국소 재발 후 재 절제한 표본은 연골아세포형 골육종으로 진단하였다. 다발성 섬유성 이형성증에서 속발한 연골아세포형 골육종을 저악성도 연골육종으로 오진하여 치료방침에 오류가 있었던 1례를 문헌고찰과 함께 보고하는 바이다.

급속히 자연 퇴행한 양안 안와 가성종양

이승준,Seung Jun Lee,M,D 대한안과학회 2007 대한안과학회지 Vol.48 No.8

Purpose: To report a rare case of bilateral pseudotumor with a two-week rapid spontaneous regression Method: A 63-year-old man visited our clinic with a chief complaint of a headache and right ocular pain. An orbital computerized tomography (CT) scan revealed a roud mass with well-demarcated capsule-like boundaries located in the inferior part of both orbits. After a systemic evaluation to exclude a systemic malignancy, we performed excisional biopsy of the right orbital mass to make diagnosis. Result: The right orbital mass was not found at the time of surgery for an excisional biopsy. Instead, we took multiple small biopsies of orbital fat, inferior rectus muscle, and adjacent soft tissues. Histologic examination revealed a non-specific inflammatory reaction without the presence of tumor cells. There was a marked spontaneous regression of the mass in both orbits on an immediate follow-up orbital CT. The patient began steroid treatment for 12 weeks under the presumptive diagnosis of bilateral pseudotumor. There was no evidence of recurrence at the eight-month follow-up.

해양환경 하에서 Ni-Cr계 자용성 합금 코팅된 ALBC3 합금의 캐비테이션 특성 평가

이승준,김성종,Lee, Seung-Jun,Kim, Seong-Jong 해양환경안전학회 2013 海洋環境安全學會誌 Vol.19 No.5

본 연구에서는 ALBC3 합금에 Ni기 자용성 합금으로 내마모성 및 내캐비테이션 특성을 향상시키기 위하여 용사코팅 후 열처리를 실시하여 캐비테이션 특성을 평가하였다. 본 연구 결과, 자용성 합금 코팅층이 높은 경도를 나타내어 내마모성이 우수할 것으로 판단되나, 다공질의 조직으로 인해 열악한 내캐비테이션 특성을 나타냈다. 따라서 열처리 조건의 최적화가 중요하며, 본 조건에서는 열처리 온도를 높여 자용성 합금 내 B와 Si의 유동성을 증가시킴으로써 기공이나 결함을 제거하여 특성개선 효과를 기대할 수 있을 것으로 판단된다. In this study, cavitation characteristics of a thermal spray coating were evaluated in order to improve durability and cavitation resistance. For a coating material, a Ni-based self-fluxing alloy was thermal-sprayed over a ALBC3 alloy substrate and subsequently modified by heat treatment.The resulted self-fluxing coating layer had relatively high hardness compared to the base material, and thus would be expected to exhibit good durability. However, the cavitation characteristics were deteriorated due to the intrinsic porous structure of the coating. Therefore, it is essential to optimize heat treatment condition during thermal spraying coating process for self-fluxing alloy, and in this research the increase in heat treatment temperature is thought to increase the fluidity of B and Si in the self-fluxing alloy and to remove pores or defects, leading to the characteristics enhancement.

소아복통(小兒腹痛)의 병인병리(病因病理)에 관(關)한 문헌적(文獻的) 고찰(考察)

이승준,박은정,김덕곤,정규만,Lee Seung-Jun,Park Eun-Jeong,Kim Deok-Gon,Jeong Gyu-Man 대한한방소아과학회 1991 대한한방소아과학회지 Vol.5 No.1

소아안신탕(小兒安神湯)이 STRESS를 유발한 흰쥐의 적출심장(摘出心臟)에 미치는 영향

이승준,이진용,김덕곤,Lee Seung-Jun,Lee Jin-Yong,Kim Deok-Gon 대한한방소아과학회 2000 대한한방소아과학회지 Vol.14 No.2

It has long been known that SOAT is effective for sudden palpitation occurring unexpectedly in Oriental Medicine. However, effect of SOAT on the isolated heart has not been studied yet. The purpose of this study is to investigate the effect of SOAT on hemodynamics and ECG of isolated rat hearts induced by electrical stimulation using Langendorff perfusion apparatus for nonworking heart. SOAT extract was manufactured by water-alcohol precipitated method. Sprague-Dawley rats weighting $120{\sim}150g$ were used for the experiments, Subject animals were divided into four groups, which are consisted of 1) control(Group orally administered by normal saline 1ml for 14days), 2) sample A(Group orally administered by SOAT extract 1ml for 14days), 3) sample C(Group injected by SOAT extract 0.5ml after stimulation, 4) sample C(Group injected by SOAT extract 1ml after stimulation. To evluate the effects of SOAT on hemodynamics and ECG of isolated rat heart induced by stimulation, heart rate, left ventricular pressure, systolic power, diastolic power, coronary artery perfusion volume and ECG were measured using Langendorff apparatus in both stimulation mode(5 volts, 450 beats/min) and arrythmic mode(5 volts, 420 beats/min including 60 beats/min) The results obtained are as follows : 1. After receiving stressful electrical stimuli, isolated heart showed the heart rate, left ventricular pressure, systolic power, diastolic power, coronary artery perfusion volume were all decreased temporarily, but perfusion continued longer recovery to the control state appeared. However, the coronary artery perfusion volume diminished continuously. 2. The heart rates did not change significantly with both stimulation mode and arrhythmic mode, among experimental groups. 3. The left ventricular pressure showed with both stimulation mode and arrhythmic mode, the significant changes(p<0.05) especially in the injection sample group. In case of stimulation mode, low concentration injection group(0.5ml) was more significantly increased rather than high concentration group(1ml) and in case of arrhythmic mode, high density group(1ml) was so increased than the other(0.5ml). 4. For the systolic power and diastolic power, no significant changes were noticed in the stimulation mode, but in the arrhythmic mode of injection sample groups, significant change(p<0.05) was noticed in both systolic power and diastolic power. Specially the high concentration group(1ml) showed more significant increase than the low concentration group. 5. For the coronary artery perfusion volume, no significant change difference among sample groups was observed in both the stimulation mode and the arrhythmic mode. 6. For the ECG recordings, arrhythmia was induced by electrical stimulus of arrythmia mode and after the stimulus was removed, irregular wave appeared temporarily, but as perpusion continued, recovery to the control state was abtained like the stimulation mode. According to the above results, SOAT significantly changed the hemodynamic data from the electrically stressed, isolated hearts of connected Langendorff perfusion apparatus and we propose SOAT has the direct effects on the muscular function of heart.

MR 감쇠기가 설치된 모멘트골조의 연쇄붕괴 저항성능

이승준,김진구,민경원,Lee, Seung-Jun,Kim, Jin-Koo,Min, Kyung-Won 대한건축학회 2011 대한건축학회논문집 Vol.27 No.2

In this paper the progressive collapse resisting capacity of steel moment frames with MR dampers was evaluated. Parametric studies were carried out using a steel beam-column sub-assemblage with varying natural period and yield strength. The effect of dampers with varying damping coefficients installed in the sub-assemblage was evaluated after sudden removal of the column. Then the progressive collapse potential of a 15-story steel moment frame installed with MR dampers was evaluated by nonlinear dynamic analysis. According to the parametric study the vertical displacement generally decreased as the friction force of MR damper increased, and the dampers were effective both in elastic and elasto-plastic systems. The nonlinear dynamic analysis results of the 15-story analysis models showed that the decrease in vertical deflection of the structure with 9m span length, which showed larger deflection, was more predominant than that of the structure with 6m span length.

소아(小兒) 유아질환(乳蛾疾患)에 대(對)한 동서의학적(東西醫學的) 고찰(考察)

이승준,이진용,정규만,Lee Seung-Jun,Lee Jin-Yong,Jeong Gyu-Man 대한한방소아과학회 1994 대한한방소아과학회지 Vol.8 No.1

조건부 엔트로피 제한 벡터 양자화를 이용한 영상 부호화

이승준,서용창,이충웅,Lee, Seung-Jun,Seo, Yong-Chang,Lee, Choong-Woong 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.11

벡터 양자화를 이용하여 영상신호를 압축하는 경우, 원 영상을 복원하기 위하여 복호기쪽에 어야 하는 인덱스들 사이에는 높은 상관성이 존재하며, 이러한 높은 상관성을 인덱스의 부호화에 이용하면 보다 높은 부호화 효율을 얻을 수 있다. 본 논문에서는, 각 인덱스들을 이전 인덱스의 값에 따라 적응적으로 부호화하는 조건부 엔트로피 부호화를 도입하고, 이 경우 벡터 양자기를 최적화하는 방법을 제안한다. 즉, 조건부 엔트로피 부호화를 도입하는 경우 각 입력벡터당 평균 비트수는 조건부 엔트로피에 근접한다는 사실을 유용하여, 조건부 엔트로피를 제한한 상태에서 평균 왜곡을 최소화 하도록 VQ 부호책을 구성함으로써 최적화 과정이 이루어진다. 또한, 이와 같이 각 입력벡터의 양자화 결과가 다음 입력벡터의 인덱스를 부호화하는데 영향을 미치는 경우, 장시간(long term)의 관점에서 최적인 인덱스열을 찾기 위해 우리는 비터비 탐색 방법을 도입한다. 영상 모의 실험을 통해, 제안하는 방법이, 구획간의 상관성을 이용하지 않는 기존의 엔트로피 제한 벡터 양자기에 비해 같은 비트율에서 약 1.0~3.0 dB 높은 PSNR을 나타냄을 알 수 있었다. This paper proposes a new vector quantization scheme which exploits high correlations among indexes in vector quantization. An optimal vector quantizer in the rate-distortion sense can be obtained, if it is designed so that the average distortion can be minimized under the constraint of the conditional entropy of indes, which is usually much smaller than the entropy of index due to the high correlations among indexes of neighboring vectors. The oprimization process is very similar to that in ECVQ(entropy-constrained vector quanization) except that in the proposed scheme the Viterbi algorithm is introduced to find the optimal index sequence. Simulations show that at the same bitrate the proposed method provides higher PSNR by 1.0~3.0 dB than the conventional ECVQ when applied to image coding.