구조 비선형성을 고려한 상태공간 천음속 날개꼴의 공력탄성해석

장민성,이종수 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.2

An aeroelastic stability analysis is numerically simulated for two-degree-of-freedom transonic airfoils with some structural nonlinearities in torsional stiffness. A state-space method is used to model the characteristic values of the unsteady transonic flow. Structural nonlinearities considered in the present study are free-play, bilinear spring and friction. The stability of the aeroelastic system is determined by converging values of the angle of attack and bending displacement in time domain. The flutter behavior and vibratory amplitudes are examined for a number of flight conditions and airfoil geometry configurations.

위 MALT 림프종에서 다발성 림프절 전이로 오인된 동시성 림프절 결핵 1예

김성은,김규종,김도현,송준영,문대성,장리라,유찬희,문원,박무인,박선자,김영옥 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2

28세 남자가 내시경적 점막절제술을 통해 저등급 위MALT 림프종으로 진단되었다. 병기설정을 위해 18F-FDG PET 검사를 시행하였고 우측 쇄골상부, 우측상/하부 기관주위, AP window 부위에 강한 섭취가 관찰되어 전이성 림프절로 판단하였다. 그러나, 우측 쇄골상부 림프절에서 시행한 절제생검에서 만성육아종성염증소견이 관찰되었고 조직의 결핵 중합효소연쇄반응에서도 양성 반응을 보였다. 2개월간 항결핵제의 사용 후 시행한 추적 컴퓨터단층촬영 검사에서 림프절 크기의 감소를 보여 최종적으로 위 MALT 림프종에서 광범위 림프절 전이로 오인된 동시성 림프절 결핵으로 진단되었다. A 28-year-old man was diagnosed as gastric MALT lymphoma in diagnostic EMR (endoscopic mucosal resection). He subsequently underwent an 18F-FDG PET. 18F-FDG PET showed intense multifocal uptake in right supraclavicular, right upper and lower paratracheal, and AP window areas that was considered radiologically to represent widespread metastatic lymphadenopathy. Excisional biopsy of a supraclavicular lymph node, however, revealed chronic granulomatous lymphadenitis with a positive reaction of Tb-nested PCR. After antituberculosis treatment for 2 months, a follow-up CT scan showed complete resolution of the lesions. Intense 18F-FDG uptake could be due to an infectious process such as synchronous tuberculous lymphadenitis. Therefore, this could mimic a malignant condition such as lymphoma with extensive lymph node metastasis due to a false-positive finding, which may lead to a misdiagnosis.

개선된 Hopfield 신경망 모델을 이용한 A/D 변환기 구현

장종승,정영호,이상부,임영도 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2

Due to the rugged energy function of the original Hopfield networks, the output is usually one local minimum in the energy function. This paper an analysis on the location of local minima in Hopfield networks and discribes modified network architecture to eliminate local minima. This modified Hopfield networks has been successfully applied to the construction of analog-to-digital converter with optimal solutions. Experimental results on the voltage transfer characteristics of data converter is presented.

구조적 분석으로부터 OMT로의 사상

장종표,방만원,방상원 木浦大學校 情報産業硏究所 1996 情報産業硏究誌 Vol.4 No.-

객체 지향 방법은 많은 장점을 가지고 있지만, 지금까지 발전시켜온 전통적인 방법을 버릴수 없다든지, 객체 지향 기법의 전문가가 많지 않기 때문에 성공의 보장도 확실하지 않는 이유들 때문에 시스템 개발에 쉽게 수용 하지 못하고 있다. 구조적 분석 방법을 객체 지향방법으로 변환하려는 노력이 많아지고 있지만 정형화된 방법은 없다. 본 논문에서는 전통적인 구조적 분석 모델로부터 객체 지향 모델로의 변환방법을 검토하고 구조적 분석 모델, 즉 자료흐름도,자료사전,개체관계도 모델로부터 객체지향의 대표적 모델인 OMT의 객체모델로의 사상에 대한 새로운 방법을 제안한다.

GMDP 신경망 알고리즘과 PID 제어기를 이용한 효율적인 PLANT 제어에 관한 연구

장진청,설재훈,장종승,추연규,임영도 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2

Adapative control theory or parameter tuning of PID controller is mainly limited in linear systems. But in this paper, using a nonlinear mapping capability of NNS, we derive a realtime tuning method of PID controller based on a Back-Propagation method of single GMDP NN. A variety of neural models, especially higher-order networks, are known to computationlly powerful for complex application. While they have advantages over traditional multilayered perceptrons, the uniformity in their network structures, learning algorithms and loop time creates practical problems. Thus this paper evaluates the capability between MLP and GMDP for performing velocity control. Backpropagation is applied to the GMDP as learning rule.

알지네이트 비드를 이용한 메틸 오렌지의 봉입 및 방출에 미치는 키토산의 영향

변종찬, 이상은. 장우석, 이은주, 최진석, 박정숙 충남대학교 약학대학 의약품개발연구소 2017 藥學論文集 Vol.32 No.-

In this study, methyl orange-loaded alginate beads were prepared and compared to investigate the effect of chitosan on the encapsulation and release of hydrophilic methyl orange in alginate beads. Particle size and encapsulation efficiency of alginated beads were determined. Swelling ratio and disintegration of al-ginate beads were investigated in gastrointestinal environment. Particle size of beads was 1.1-1.5 mm and shape was spherical. Weight of beads was increased depending on the content of chitosan. Content of chitosan affected on the encapsulation of methyl orange. Encapsulation of methyl orange in alginate beads without chitosan was 15%, while encapsulation efficiency was increased with addition of chitosan. Beads were not disintegrated in HCl solution (pH 1.2) within 4 h, with floating and swelling. Swelling ratio of beads was in-creased to 222%. Release of methyl orange from alginate beads without chitosan was up to 70% within 2 h in HCl solution (pH 1.2). When chitosan was added to the alginate beads, release of methyl range from beads was significantly reduced. It is supposed that release of methyl orange from beads is resulted from diffusion and erosion of beads, which is pH-dependent. In condusion, chitosan-alginate beads have potentials to control release of small hydrophilic drugs by the addition of chitosan.

적외선을 이용한 액체 유기물 내 수분 농도 감지기

장성태,정종대,정경석 한국기술교육대학교 2004 論文集 Vol.10 No.2

Water in liquid organic chemicals tends to lower power output or result in the failure of internal combustion engines. There have been lots of proved standard techniques of measuring the water contents in oil, such as distillation, coulometric Karl Fischer titration, and centrifuge. These techniques, however, are mainly for laboratory uses and hard to be used for the continuous monitoring application. Light absorption of water in the near-IR has been used to develop a sensor system to continuously detect water presence in the oil flow. Result shows functional correspondence in the output voltage of the sensor system and water concentration.

시멘트 종류별 콘크리트의 적산온도에 의한 강도예측에 관한 연구

장종호,나철성,김재환,김용로,길배수,남재현,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The purpose of this study is to exhibit fundamental data which can apply to quality and process management of structure concrete using special cement in the construction field investigating strength prediction by maturity method of concrete according to cement types. The activation energy value was derived from the experimental study that experimental factors were selected as W/C ratio of 45%, the kinds of cements of 3 levels of O.P.C, H.B.C, H.S.C and curing temperature of 3 levels of 5℃, 20℃, 35℃. Also, after investigating relationship between compression strength and equivalent ages of concrete according to cement types, the strength prediction was investigated by maturity method. As the above of results, differences between the prediction strength by strength prediction equation and the actual measurement strength were lower, therefore it is considered that the strength prediction by maturity method is possible not only concrete using normal portland cement but also concrete using special cement.

평생건강교실 프로그램이 노년기 여성들의 건강관련체력과 혈중지질에 미치는 영향

장경태,이규성,안종철,김문희,이미화,오재근 韓國體育大學校 1998 論文集 Vol.21 No.-

The purpose of this study were to investigate the effects of participation of health program on health related physical fitness and blood lipids in olderwomen. The subjects participated in this study were 52 older who were participated physical activity program in Korean National University of Physical Education. The analysis of this study utilized one way ANOVA design. The results of the study were as follows : 1. According to taking the treatment periods(0, 6, 12), body composition, hand grip, sit and reach, sit up, and 3200m walking were no significant difference. 3. According to taking the treatment periods(0, 6, 12), TC, TG, LDL-C, HDL-C and VLDL-C were a significant difference in p<.001 levels.

아동기 부모양육에 대한 인식이 성인기 배우자 관계에 미치는 영향

장상렬,이종범 大韓神經精神醫學會 1995 신경정신의학 Vol.34 No.4

This study was conducted to identify the effect of child-parent relationships on later adult social bonds in the general popultion. The subjects were 66 married males and 41 married females between the age of 20 and 65 years old in Taegu City. the survey was conducted from March 1 to July 31, 1994. The subjects were tested by Parental Bonding Instrument(PBI) and Intimate Bond Measure(IBM). The results were as follows : The subjects with more caring parents perceived that their spouses also cared for them(p<0.05). Scores of mother's overprotection and most overprotective parent's scores had a negative influence on adults' perception about their spouses' caring (p<0.05). These findings suggest that the childhood experience with parenting contributes to the quality of interpersonal relationships in adulthood. The highest significant correlation is placed between the least caring parent and intimacy of being cared for by their spouse(p<0.001). this finding indicates that if feelings of being protected and not being cared for had been coexisted, the quality oflater interpersonal relations would be more influenced by negative feelings than positive ones. It is also suggested thatthe overprotection has less pathological effects on the quality of interpersonal relations than lack of caring. There were also gender differences. In male subjects, there were significant correlations between scores of maternal care, overprotection and the least caring prent and feelings of being cared for by their spouses(p<0.05). And there were significant correlations between the scores of paternal care and feelings of being controlled by their spouses(0.01). In female subjects, all paternal care and overprotection subscales were significantly corelated with feelings of being cared for by their spouses(p<0.05). The subjects who had experienced separation from their mothers in childhood had a significant correlation with feelings of being controlled by their spouses(p<0.05). This suggests the distress of seperation from parents in childhood could be a factor which affects the social bonds in adulthood.