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진행성 전신경화증 환자에서 식도관련증상과 식도 운동성과의 상호관계
송인성(I S Song),최규완(K W Choi),김정룡(C Y Kim),정영화(Y H Chung),이풍렬(P L Rhee),정현채(H C Jung),송영욱(Y W Song),이효석(H S Lee),윤용범(Y B Yoon) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.3
N/A To investigate the correlation of esophageal symptoms w ith esophageal manometric parameters in patients with progressive systemic sclerosis (PSS) we tested esophageal motility in 10 patients with PSS who were admitted to Seoul National University Hospital from Feb. 1988 to Aug. 1988 and in 5 normal subjects, and we analyzed every parameters. The results were as follows: 1) 4 patients with esophageal symptoms showed marked decrease of lower esophageal sphincter pressure (LESP) (9.I+4.4 mmHg vs 27.9+8.5 mmHg; p< 0.005) while 6 patients having no esophageal symptoms showed normal LESP (29.4+4.0 mmHg vs 27.9+8.5 mmHg). 2) Normally propagating peristaltic waves were not found in the lower esophageal bodies of 4 patients who had esophagea] symptoms. On the other hand, among 6 patients without symptoms, 3 patients showed no propagating peristaltic waves while the other 3 patients showed normally propagating peristaltic waves in the lower esophagus. 3) The amplitudes of contraction waves at upper esophageal body of patients with esophageal symptoms were decreased compared with those of patients who had no esophageal symptom. (29.0+6.1 mmHg vs 21.0+4.4 mmHg; p<0.05) 4) In cases not showing normally propagating peristaltic waves, nonpropagating, hroad-based, low-amplitude contractions were found at the lower esophageal body. In conclusion, LESP is the esophageal manornetric parameter vhich seemed to be the most closely correlated with esophagea) symptoms in patients with PSS. And PSS seems to influence the upper esophageal contraction. Our data also indicates that esophageal manometry may be useful in the early detection of esophageal involvement in patients with PSS.
Modeling for the Performance Analysis of a Tubular SOFC/MGT Hybrid Power System
T. W. Song(송태원),J. L. Sohn(손정락),J. H. Kim(김재환),T. S. Kim(김동섭),S. T. Ro(노승탁),K. Suzuki 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Performance of a solid oxide fuel cell (SOFC) can be enhanced by converting thermal energy of its high temperature exhaust gas to mechanical power using a micro gas turbine (MGT). A MGT plays also an important role to pressurize and warm up inlet gas streams of the SOFC. In this study, the influence of performance characteristics of the tubular SOFC on the hybrid power system is discussed. For this purpose, detailed heat and mass transfer with reforming and electrochemical reactions in the SOFC are mathematically modeled, and their results are reflected to the performance analysis. The analysis target is 220kWe SOFC/MGT hybrid system based on the tubular SOFC developed by Siemens-Westinghouse. Special attention is paid to the ohmic losses in the tubular SOFC counting not only current flow in radial direction, but also current flow in circumferential direction through the anode and cathode.
광학적 방법으로 측정된 양자우물 안의 InAs 양자점의 에너지 준위
남형도,곽호상,송진동,최원준,조운조,이정일,조용훈,최정우,양해석,Nam H.D.,Kwack H.S.,Doynnette L.,Song J.D.,Choi W.J.,Cho W.J.,Lee J.I.,Cho Y.H.,Julien F.H.,Choe J.W.,Yang H.S. 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.2
PL (photoluminescence), PLE (PL excitation) 그리고 근 적외선 투과 분광법을 활용하여 InAsGa/GaAs 우물 내 InAs 양자점 구조의 광학적 특성과 전자 버금 띠 구조에 대하여 연구하였다. 투과 스펙트럼과 PLE 스펙트럼으로부터 InAs 양자점 내 세 개의 구속 상태와 InGaAs/GaAs 우물 내에 두 개의 구속 상태가 존재함을 발견하였고, 광전류 스펙트럼에서 관측된 버금 띠 사이 전이들과 연관지어 해석하였다. We investigated the optical property and the electronic subband structure of InAs quantum dots in an InAsGa/GaAs well structure utilizing photoluminescence (PL), PL excitation (PLE) and near infrared transmission spectroscopy. From transmission and PLE spectra, we found three bound states in the InAs quantum dot and two bound states in InGaAs/GaAs quantum well, and correlated to the results of intersubband transitions observed in photocurrent spectrum.
1×1 ㎟ 대면적 녹색 LED의 전기 광학적 특성 분석
장이운(L. W. Jang),조동섭(D. S. Jo),전주원(J. W. Jeon),안태영(Tae-Young Ahn),박민주(M. J. Park),안병준(B. J. Ahn),송정훈(J. H. Song),곽준섭(J. S. Kwak),김진수(Jin-Soo Kim),이인환(I. -H. Lee),안행근(H. K. Ahn) 한국진공학회(ASCT) 2011 Applied Science and Convergence Technology Vol.20 No.4
본 논문은 InGaN/GaN 다중양자우물 구조를 가지는 녹색 발광다이오드의 활성층 내 인듐(In) 조성비와 piezoelectric field에 대한 전계 흡수 현상을 연구하였다. 활성층 내 결정학적 성질과 In 조성비는 double crystal X-ray diffraction 측정으로 분석하였으며, 1×1 ㎟ 대면적 칩을 제작하여 발광특성을 조사하였다. 또한, 활성층 내 piezoelectric field는 electro-reflectance spectroscopy로부터 측정한 compensation voltage를 이용해 계산하였고, 인가전압에 따른 photocurrent의 변화를 측정함으로써 녹색 발광 소자의 전기 광학적 특성을 분석하였다. We investigated the effects of piezoelectric field on the electro-absorption characteristics in InGaN/GaN multiple-quantum well (MQW) green light emitting diodes (LED). Double crystal X-ray diffraction measurement was performed to study the crystalline property and indium (In) composition in the MQW active layer. To measure the electro-luminescence and electro-reflectance (ER) spectroscopy, we fabricated the 1×1 ㎟ large-area green LED chip. The piezoelectric field inside the LED structure was evaluated from the Vcomp in active layer by the ER spectra. Finally, we analyzed the electro-absorption characteristics of the green LED by using the photo-current spectroscopy.
Son, L.T.,Ko, K.M.,Cho, J.H.,Singaravelu, G.,Chatterjee, I.,Choi, T.W.,Song, H.O.,Yu, J.R.,Park, B.J.,Lee, S.K.,Ahnn, J. North-Holland Pub ; Elsevier Science Ltd 2011 FEBS letters Vol.585 No.9
Dicarbonyl/l-xylulose reductase (DCXR) converts l-xylulose into xylitol, and reduces various α-dicarbonyl compounds, thus performing a dual role in carbohydrate metabolism and detoxification. In this study, we identified DHS-21 as the only DCXR ortholog in Caenorhabditis elegans. The dhs-21 gene is expressed in various tissues including the intestine, gonadal sheath cells, uterine seam (utse) cells, the spermathecal-uterus (sp-ut) valve and on the plasma membrane of spermatids. Recombinant DHS-21 was shown to convert l-xylulose to xylitol using NADPH as a cofactor. Dhs-21 null mutants of C. elegans show defects in longevity, reproduction and egg-laying. Knock-down of daf-16 and elt-2 transcription factors affected dhs-21 expression. These results suggest that DHS-21 is a bona fide DCXR of C. elegans, essential for normal life span and reproduction.
Soft artificial electroreceptors for non-contact spatial perception
W.J. Song(송원준),Y. Lee(이영훈),Y. Jung(정연수),Y.-W. Kang(강용우),J. Kim(김준형),J.-M. Park(박재만),Y.-L. Park(박용래),H.-Y. Kim(김호영),J.-Y. Sun(선정윤) 한국생산제조학회 2021 한국생산제조시스템학회 학술발표대회 논문집 Vol.2021 No.7
Elasmobranch fishes, such as sharks, skates and rays, use a network of electroreceptors distributed on their skin to locate adjacent prey. The receptors can detect the electric field generated by the biomechanical activity of the prey. By comparing the intensity of the electric fields sensed by each receptor in the network, the animals can perceive the relative positions of the prey without making physical contact. Inspired by this capacity for prey localization, we developed a soft artificial electroreceptor that can detect the relative positions of nearby objects in a non-contact manner by sensing the electric fields that originate from the objects. By wearing the artificial receptor, one can immediately receive spatial information of a nearby object via auditory signals. The soft artificial electroreceptor is expected to expand the ways we can perceive space by providing a new sensory modality that did not evolve naturally in human beings.