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- 저자 : 서영진 (검색결과 906 건)
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Some Characterizations on CR-Submanifolds of a Complex Projective Space
서영진 安東大學 1984 安東大學 論文集 Vol.6 No.1
복소사영공간 CP^(m)의 CR-부분다양체 M으로서 Hopf-fibration π:S^(2m+1)(1)→CP^(m)과 양립인 것을 생각한다. 다시 말해서 다음 도식이 가환인 것을 생각한다. ◁수식 삽입▷(원문을 참조하세요) 이때 π^(-1)(M)의 국소대칭성에 관련된 성질로서 M이 모델 CR-부분다양체 π(S^(m)1(r_(1))×…×S^(mk)(r_(k))또는 CP^(m/2)가 될 필요충분조건을 찾음으로서 이 모델 다양체의 특성을 밝혔다.
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온도에 따른 단삼의 광합성 특성 및 수확시기가 품질에 미치는 영향
서영진,김종수,김선화,김미연,정용진,성기운,정신교 한국식품저장유통학회 2015 Food Science and Preservation Vol.22 No.6
Salvia miltiorrhiza has been used for treating heart and liver disease. In the present study, the influences of temperature on photosynthetical capacity of S. miltiorrhiza under controlled cultivation environment using growth chamber were investigated because of providing information about growth and secondary metabolite synthesis. And effect of harvesting time on growth properties and constituents such as salvianolic acid B, cryptotanshinone, tanshinone I, tanshinone IIA were evaluated. Maximum photosynthesis rate (5.102 μmol CO2/m2/s) and net apparent quantum yield (0.147 μmol CO2/m2/s), stomatal conductance (0.035 mmol/m2/s) and water use efficiency (7.108 μmol CO2/mmol H2O) was highest at 20℃. Results of chlorophyll fluorescence showed that elevated temperature had contributed to reduce a quantum yield and electron flux in photosystem. This result demonstrated that favorable temperature condition was determined at 20℃. Contents of salvianolic acid B, cryptotanshinone, tanshinone I and tanshinone IIA was highest in root sample harvested at 20 March, whereas growth and yield of S. miltiorrhiza had no significant differences with harvesting time. Therefore, this study shows that temperature play an important role in photosynthetic activity and harvesting time have influence upon accumulation of constituents in root of S. miltiorrhiza.
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On Real Hypersurface of a Complex Projective Space Concerned with Parallel Ricci Tensor
서영진 安東大學 1985 安東大學 論文集 Vol.7 No.1
복소사영공간 CP^(m)의 실초곡면 M으로서 Hopf-fibration π; S^(2m+1)_(1)→CP^(m)과 양립인 것을 생각한다. 다시 말해서 다음 도식이 가환인 것을 생각한다. ◁표 삽입▷(원문을 참조하세요) 이때 π^(-1)(M)이 locally symmetric 공간 또는 Einstein공간이 될 경우를 일반화한 Ricci-평행성에 관련된 성질로서, M이 CP^(m)의 Model공간 M(a,b)(a^(2)+b^(2)=1, p+q=m-1)이 될 필요충분조건을 찾음으로서 이 Model공간의 특성을 밝혔다.
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서영진,최영희,신재혁,양철중,송시영 대한족부족관절학회 2015 대한족부족관절학회지 Vol.19 No.3
We experienced a rare case of parosteal lipoma, which located on the periosteum of the foot 4th metatarsus. A 22-year-old woman visited the hospital with painful mass in her foot. Based on the assessment of plain radiographs, computed tomography scan, and magnetic resonance image, it was suspected as lipoma. Marginal excision was performed and parosteal lipoma was confirmed histologically. Any local recurrence and complications were not observed in 2 years after surgery
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영양진단을 위한 신속한 엽분석 방법으로서 근적외분광분석기의 이용
서영진,박만,김창배,윤재탁,조래광,Seo, Young-Jin,Park, Man,Kim, Chang-Bae,Kim, Jong-Su,Yoon, Jae-Tak,Cho, Rae-Kwang Korean Society of Soil Science and Fertilizer 2000 한국토양비료학회지 Vol.33 No.4
The Near Infrared Reflectance Spectroscopy(NIR) was used to evaluate nutritional diagnosis for rapid leaf analysis method, 177 'Fuji' apple and 130 'Campbell Early' grape leaves were measured by Near Infrared reflectance spectra in the NIR region(1,100~2.500nm). Total nitrogen content was measured by kjelldhal distillation, after salycilic acid-sulfuric acid digestion. An empirical equation to predict total nitrogen content from its spectral signature was developed by adapting the Near Infrared Reflectance Spectroscopy analysis(NIRa) technique and the results were apple-0.965(R). 0.086(SEC), grape-0.926(R), 0.152(SEC). Standard Error of Prediction(SEP) of NIRa for predicting the total nitrogen of apple and grape leaves was 0.360 and 0.210, respectively. It was concluded that Near infrared reflectance spectroscopy analysis is promising method for rapid analysis of apple and grape leaves.
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Ni-foam/Sn-3.0Ag-0.5Cu 복합 솔더 소재를 이용한 EV 파워 모듈 패키지용 천이 액상 확산 접합 연구
서영진,허민행,윤정원 한국마이크로전자및패키징학회 2023 마이크로전자 및 패키징학회지 Vol.30 No.1
In this study, Sn-3.0Ag-0.5Cu (wt.%, SAC305) solder dipping process was performed between Ni-foam skeleton with different pore per inch (PPI) to fabricate Ni-foam/SAC305 composite solder, and then applied to the transient liquid phase (TLP) bonding process to evaluate the microstructure and mechanical properties of the bonded joint. The Ni-foam/SAC305 composite solder preform consisted of Ni-foam and SAC305, and an intermetallic compound (IMC) having a (Ni,Cu)3Sn4 composition was formed at the Ni-foam interface. During TLP bonding process, the IMC at the Ni-foam interface was converted to (Ni,Cu)3Sn4+Au, and as the bonding time increased, the Ni-foam and SAC305 continuously reacted, and the bonded joint was converted into an IMC. And it was confirmed that the 130 PPI Ni-foam/ SAC305 composite solder joint was converted into an IMC at the fastest rate. As a result of performing a shear test to confirm the effect of Ni-foam on mechanical properties, solder joints under all conditions exhibited excellent mechanical properties of 50 MPa or more in the early stages of the TLP bonding process, and the shear strength tends to increase as the bonding time increases. 본 연구에서는 서로 다른 Pore per inch (PPI, 1 inch 당 pore의 수)를 갖는 Ni-foam 사이에 Sn-3.0Ag-0.5Cu (wt.%, SAC305) 솔더 침지 공정을 수행하여 Ni-foam/SAC305 복합 솔더를 제조한 후, 이를 천이액상 확산 접합(Transient liquid Phase bonding, TLP bonding) 공정에 적용하여 형성된 접합부의 미세구조 분석 및 기계적 특성 평가가수행되었다. 제조된 Ni-foam/SAC305 복합 솔더 프리폼 (Solder preform)은 Ni-foam 및 SAC305로 구성되었으며, Nifoam 계면에는 (Ni,Cu)3Sn4 조성의 금속간 화합물이 형성되었다. TLP 접합 공정 수행 시, Ni-foam 계면의 금속간 화합물은 (Ni,Cu)3Sn4+Au로 변환 되었으며, 접합 시간이 증가할수록 Ni-foam과 SAC305가 지속적으로 반응하면서 접합부는금속간 화합물로 변환되었다. 130 PPI Ni-foam/SAC305 복합 솔더 접합부가 가장 빠른 속도로 금속간 화합물로 변화되는 것을 확인하였다. 기계적 특성에 미치는 Ni-foam의 영향을 확인하기 위해 전단 시험 수행 결과, TLP 접합 초기에 모든 조건의 솔더 접합부는 50 MPa 이상의 우수한 기계적 특성을 나타내었으며, 접합 시간이 증가할수록 전단 강도는 증가하는 경향을 나타내었다.
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