간접형광항체반응에 의한 인체낭미충증의 혈청학적 진단에 관한 연구

강욱중,엄기선,임한종 고려대학교 의과대학 1987 고려대 의대 잡지 Vol.24 No.1

The indirect fluorescent antibody test (IFAT) for cysticercosis was accomplished with the sectioned cyst wall tissue antigen which was made with the cyst in the fourth ventricle of human brain. The antigen was revealed on the tegument, nuclear layer and internal surface of the bladder wall with FITC conjugated IgG fraction goat antihuman immunoglobulins. Total 236 sera were tested which were obtained from 24 cases of confirmed cerebral or dermal cysticercosis patients, 33 cases of suspected cysticercosis, 50 cases of intestinal or tissue invading larval cestodiasis, 50 cases of trematodiasis, 14 cases of nematodiasis or elevated eosinophilia and 65 cases of non-infected control sera. The serum titer of 1:16 or over was regarded as positive. Twenty three out of twenty four (95.8%) sera from confirmed cysticercosis patients were positive. Serum titer of 65 non-infected controls showed 1:8 or below. Twelve cases out of thirty three (36.4%) suspected cases of cysticercosis were revealed as positive. And cross reactions were observed in taeniasis solium (40.0%), taeniasis saginata (13.3%), diphyllobothridiasis laturn (11.8%) and lonorchiasis sinensis (2.8%). The mean titer of cerebral cysticercosis (7.60 in log₂) was higher than those of mixed (5.61 in log₂) and dermal cysticercosis (5.44 in log₂). The titers of cerebral cysticercosis patient's sera who were treated with praziquantel were not changed at least within six months in four cases out of seven followed up cases. In four to five year after treatment with praziquantel it showed decreased or negatively converted serum titers. Conclusively, it was indicated that indirect fluorescent antibody test using the sectioned antigen of Taenia solium cysticerci was applicable to the diagnosis of cysticercosis.

형상인식을 위한 신경망 기법의 비교에 관한 연구

강경아,이기준,정채영 조선대학교 통계연구소 1999 統計硏究所論文誌 Vol.1 No.1

In this paper, implemented the algorithms that recognize the image learning the standard data by Back propagation and Hopfield network of neural network Back propagation learning method needs more hours in carrying out one-time learning due to the hopfield algorithm, but in the rate of detection per learning frequency, back propagation shows an excellence. Back propagation learning algorithm requires 25 seconds to obtain the rate of 97% detection of the image, but to detect the image over 99%, the time of 1 minute and 20 seconds is required and while the rate of image recognition is very high in initial learning, it is delayed from over 97%. To the contrary, in the case of hopield network, more hours are required to recognize 97% of the image than back propagation, but in recognizing the image over 99%, it requires shorter hours than back propagation.

LiNbO₃기판을 사용한 광 도파로의 설계 및 분석

강기성,채기병,소대화,박정철 明知大學校 産業技術硏究所 1991 産業技術硏究所論文集 Vol.10 No.-

In this paper, we calculate refractive index change of optical waveguide and electric field to simulate y-cut LiNbO₃optical waveguide at He-Ne laser (λ=0.6328[㎛]) by BPM mechanism. At waveguide width of 4[㎛], buffer layer of 0.02[㎛] of LiNbO₃ substrate (XI 55[㎛] x ZI 5000[㎛], we observed electric field Ex, Ey in x, y-direction. By applying these parameters of single waveguide to simulate a X-switch, we have chosen index change of 0.002, width of 3[㎛] and angle of 0.4。∼0.6°of optical waveguide and under these conditions, optical beam propagates cross-side at 0.4° When applied switching vlotage of 25[V], optical beam of X-switch turns cross-side to bar-side at intersection angle 0.4° index change of 0.002, wavegulde width of 3[㎛], electrode gap 2[㎛]. By the above results, we can obtain the basis design conditions of X-switch optical modulator. And optical single waveguide is fabricated on the y-cut LiNbO₃ single crystal substrate by Ti-indiffusion method. The line-width of the waveguide was made from 4[㎛] to 6[㎛]that observed single mode at 4[㎛] as a result of propagation of He-Ne(0.6328[㎛]) laser beam.

동결온도가 진공포장 동결육의 품질에 미치는 영향

정인철,김도완,문귀임,강세주,김기영,문윤희 한국식품영양학회 1998 韓國食品營養學會誌 Vol.11 No.4

본 연구는 진공포장 동결육의 품질에 미치는 영향을 검토하기 위하여 수행하였다. 해동드립은 -3℃와 -20℃ 동결이 60일째 각각 5.23% 및 5.17%로 동결기간이 경과함에 따라 현저하게 증가하였다. 가열감량은 water bath와 pan에서 가열한 것이 모두 동결초기보다 동결기간이 경과함에 따라 현저하게 증가하였다. 그러나 -3℃와 -20℃ 사이에는 현저한 차이가 없었다. 염용성 단백질의 추출성은 동결기간이 지남에 따라 감소하였고, -20℃ 동결이 -3℃보다 추출성이 더 높았다. 수용성 단백질의 추출성은 동결기간이 경과하면서 증가하였고 -3℃ 동결이 -20℃보다 현저하게 높았다. 그리고 L, a 및 b값은 저장초기가 동결저장 중보다 높다. Myoglobin의 변성율은 -3℃ 동결이 -20℃보다 비교적 높게 나타났는데, -3℃ 동결의 15일째가 96.0%로 가장 높게 나타났다. 전단력가는 동결저장 중 현저한 변화가 없었고, 근원섬유의 소편화도는 동결초기보다 동결저장이 더 높았지만 동결저장 중에는 변화가 없었다. pH는 -3℃와 -20℃ 동결저장 모두 45일까지 감소하다가 그 이후에는 증가하는 경향이었다. This study was carried out to investigate the effects of freezing temperature on quality of vacuum packaging freezed beef. In case of thaw drip loss, the freezing of -3℃ and -20℃ were 5.23% and 5.17% to 60 days respectively, were increased significantly during freezing. The cooking loss of water bath and pan were increased significantly during freezing than the beginning of freezing, but were no different between -3℃ and -20℃. The salt soluble protein extractability was decreased during freezing, the -20℃ freezing was higher than -3℃ freezing. The water soluble protein extractability was increased during freezing, the -3℃ freezing was higher than -20℃ freezing. The L, a and b value of the beginning of freezing higher than during freezing. The myoglobin denatured percentage of the -3℃ freezing was higher than -20℃ freezing, the 15 days storage of -3℃ freezing was highest to 96%. The shear force value was not change during freezing, the myofibrillar fragmentation index during freezing was higher than the beginning of freezing, but was not change during freezing. The pH was decreased to freezing 45 days, after that increased.

실험적 국소뇌허혈이 대뇌피질 칼슘결합단백-양성 세포에 미치는 영향

강사준,김재휴,조진호,이제혁,우정현,이기영,배춘상 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.6

To understand the changes in expression of calcium binding proteins(CaBP) during the experimental focal ischemia, expression of two kinds of CaBP, parvalbumin(PV) and calbindin D-28K(Calbindin), immunocytochemically, and activities of cytochrome oxidase(CO) and acetylcholinesterase(AChE), histochemically, in focal ischemic brain of the rat were investigated. Two groups of focal ischemic infarction were produced in Sprague Dawley rats(200∼350㎎): Group Ⅰ. Clip compression of left middle cerebral artery(MCA) for 5∼10 mins and release; Group Ⅱ, Electric coagulation of left MCA for 2∼24 hrs. In the group Ⅰ, CO activity and PV-and Calbindin-immunoreactivity(IR) were decreased in the left MCA territory, and decreased in number of PV-and Calbindin-IR neurons and degree of IR, but AChE activity was nearly same as that of control cortex. In the group Ⅱ, decrease of CO and AChE activities, and marked increase of PV-and Calbindin IRs were noted on neuropil in the layers Ⅰ through Ⅵ of ischemic region. Characteristically pyramidal cells, which did not express the both CaBPs in the control cortex, of layer Ⅴ of ischemic cortex showed PV-and Calbindin IRs in the cell body and apical dendrite. These findings suggest that 1) PV-and Calbindin-IR neurons, mainly non-pyramidial cells, are more vulnerable than pyramidal cell to ischemic injury. 2) CaBP may have some roles in hypoxic neuronal injury, and 3) PV and Calbindin-immunocytochemistry can be used as useful technique in evaluation of experimental ischemia.

유전자 알고리즘을 이용한 에이전트 멀티캐스팅 기법

이기준,강경아,정채영 조선대학교 통계연구소 2000 統計硏究所論文誌 Vol.2 No.1

하나의 작업지점에서 그룹의 다름 멤버들에게 다중으로 데이터 전송하기 위하여 point-to-point네트워크의 multicast tree를 이용하여 구현할 수 있다. 이러한 최소화 Steiner tree를 사용한 multicast 기법은 그룹에 대하여 하나의 Steiner tree를 이용할 수 있다는 장점을 지니고 있다. 따라서 최소화된 Steiner tree를 작성하는 것은 NP-Complete 문제와 효율적인 알고리즘을 작성하는데 필수적인 문제이다. 본 논문에서는 최소화된 Steiner tree를 찾는 에이전트와 유전자 알고리즘에 대하여 기술하고자 한다. 에이전트는 노드들 사이의 가중치를 검사하고 유전자 알고리즘에 이를 전송하다. 그리고 유전자 알고리즘 이 가중치와 최적화 Steiner tree 검색작업을 시도하여 Steiner tree를 작성한다. 본 논문에서는 전형적인 유전자알고리즘에 적용된 이진 스트링(DNA)의 특징을 가진 트리기반의 genetic encoding 방법을 기술하고 이에 대한 유용성을 보이고자 한다. Multicasting transfer data from one point to the members of groups. which can be supported by using multicast tree in point-to-point network. For multicast routing a minimal steiner tree is used, and has an advantage in that only one Steiner tree is needed for a group. However, finding a minimal Steiner tree is an NP-complete problems and it is necessary to develop efficient heuristic algorithms. In this paper, we present agents and genetic algortihms for a finding minimal Steiner tree. Agents check weights among nodes and transmit these to genetic algorithms. Then, genetics algorithms build Steiner trees with these weights and try to find a optimal Steiner tree. This paper describes a tree-based genetic encoding scheme which is in sharp contrast with binary string representations usually adopted in conventional genetic algorithms, and shows the efficiency of this scheme through experiments.

Modified 9Cr-1Mo 강의 항온변태처리에 따른 미세조직 및 경도변화

유정훈,주성욱,허성강,신기삼,이수,정연길 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

Evolution of microstructure and its relation with hardness in the modified 9%Cr-1%Mo steel which was isothermally heat-treated has been investigated in various heat-treatment temperatures and time of duration. For microstructural and crystallographic analyses, optical microscope, scanning and transmission electron microscopes, energy dispersive spectrometer, and X-ray diffractometer were used. Vickers microhardness tester were used for the measurement of hardness. Precipitates of the complex M23C6, M(C,N) formed at grain boundaries and interiors of grains had led to the secondary hardening. Normalized specimen and all of the isothermally heat-treated ones showed no evidence of retained austenite.

Al-Mg합금(Al-5wt%Mg-3wt%Zn-1wt%Mn)의 T6 열처리에 따른 미세조직 및 기계적 특성변화

유정훈,신기삼,허성강,김정민 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

Al-Mg base alloys are attractive for aircraft. automobile and leisure applications because of their properties of low density, high intensity and wear resistance. The effect of Zn and Mn on the properties was studied in an Al-Mg base alloy. After T6 heat-treatment, the change of the microstructure and mechanical property was examined. Our investigations show that after T6 heat-treatment, the elongation was improved. The microstructures are investigated by TEM, which shows that the size of Al6Mn, Al57Mn12 phase is 100~500nm, and it also appears presence of the very small size MgZn₂ phase about 30nm.

특발성 좌심실빈맥(Idiopathic Left Ventricular Tachycardia)의 성공적인 전극도자절제술을 위해 단극전기도(Unipolar Electrogram)가 유용한가?

최기준,남기병,강덕현,홍명기,송재관,김재중,박성욱,박승정,박종훈,김유호 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

고속 ATM 네트워크를 위한 통신 프로토콜에 관한 연구

박기현,안기중,이상배,강문식 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.1

In this paper, a new network protocol, AD²R(ATM Distributed queue Dual Ring), is proposed for high-speed communication. This protocol is a slotted using ATM scheme. With the mathematical analysis and computer simulation, it is shown that proposed protocol is appropriate for the high-speed communication. Also, it is verified that the AD²R network performance is enhanced by using the ring topology, the destination release and the distributed queue scheme.