평판 도파로에서의 체렌코프 펌프 형태에 의한 광 매개증폭

서정식,Suh, Zung-Shik 한국광학회 2014 한국광학회지 Vol.25 No.1

We have analyzed the amplification of a signal wave in the optical parametric interactions of the pump, signal, and idler waves in planar waveguides, with the pump wave being Cerenkov radiation. Based on the coupled-mode theory, we have derived the first-order coupled-mode differential equations for no pump depletion. The equations can easily be solved numerically. The approximate analytical and numerical solutions of the equations show that the signal wave can be amplified parametrically. 평판 도파로에서 pump가 체렌코프 복사(Cerenkov radiation)의 파동인 경우, pump, signal, 그리고 idler 사이의 매개적 상호작용에 의한 signal의 증폭현상을 해석하였다. 결합모드 이론을 사용하여 pump의 고갈(depletion)을 무시할 수 있는 경우, 수치적 계산으로 쉽게 풀 수 있는 1차 결합모드 미분방정식을 유도하였다. 이 미분방정식의 근사해와 수치적 계산 예를 통해서 signal이 매개적으로 증폭될 수 있음을 보였다.

탄소중립을 위한 축열에너지 저장기술의 새로운 역할

서정식 대한설비공학회 2024 설비저널 Vol.53 No.4

냉동냉장 장치의 성능평가 기술 및 제도 동향

서정식 대한설비공학회 2019 설비저널 Vol.48 No.5

배추의 鹽漬處理에 따른 脫水現象과 食鹽浸透

徐挺植 영남이공대학 산업기술연구소 1988 産業技術硏究 Vol.2 No.-

This study was carried out to investigate the weight loss and the NaCl gain of chinese cabbage samples during pickling in brine under different conditions including various salinities, brine temperature and leaf shape with relation to kimchi making. When the whole leaves of chinese cabbage samples were used for pickling, their weight loss ratio and NaCl gain increased significantly through all the period of pickling as brine salinity did. Drastic dehydration of pickled leaves occurred especially within 2 hours after brining, thereafter their rate of dehydration decreased greatly and their weight loss ratios in brine salinity 2, 5, 10, 15, 20% were 5.72, 14.81, 15.61, 17.34, 24.10% respectively 12 hours after brining. NaCl gain in pickled cabbage samples was increased greatly in the early stage of brining but it had the tendency to increase still thereafter. The content of NaCl of all the samples pickled at brine salinity 2, 5, 10% did, not reach 3% even 12 hours after brining while that of samples pickled at brine salinity 15,20% reached 3% in the brining time, 6. 7, 3. 8 hours respectively. As the temperature of brine rose, dehydration of pickled cabbage samples did not increase except at the early stage of brining but their NaCl gain increased significantly. In case of pickling of sliced leaves, weight loss ratio increased greatly, reaching twice as much as that of whole leaves at the same brining conditions 12 hours after brining but NaCl gain had no significant difference between them. On the other hand, it was shown that the very high correlations between NaCl gain and weight loss ratio in chinese cabbage samples pickled by the same brining conditions existed.

Iris를 이용한 마이크로스트립 안테나의 소형화

서정식,우종명,Seo Jeong-Sik,Woo Jong-Myung 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.10

본 논문에서는 보다 소형화된 마이크로스트립 패치 안테나를 제작하기 위해 패치 밑면과 접지면 상에 Iris를 수직으로 부착한 3차원 구조의 마이크로스트립 안테나를 설계$\cdot$제작하였다. 부착된 Iris에 의해 패치 밑면에 흐르는 전류의 경로 증가 및 패치 내부의 유전율이 증가되는 효과를 얻고자 하였으며, 제작결과 중심주파수 1.575 GHz에서 높이 9 mm의 평면형 마이크로스트립 패치 안테나(패치 길이 81.5 mm$\times$패치 폭 90 mm)와 비교하여, 지그재그형으로 Iris를 부착한 경우 최대 $79.1\%$(17 mm$\times$90 mm)의 안테나 길이 단축 효과가 나타났다. 이때 측정된 이득 -1.15 dBd, -10 dB 대역폭 $6.2\%$(98 MHz), E-면 HPBW $154^{\circ}$를 나타내어 본 논문에서 제안된 Iris 를 부착한 마이크로스트립 안테나가 소형화에 유효함을 확인하였다. In this paper, the 3-dimensional microstrip antenna, where the lis is attached near the patch, on the pound and both patch and ground in zigzag, is designed and fabricated to miniaturize size of antenna. The path of surface current and permittivity in patch are increased because of attached Iris near the patch, on the pound and patch and found. In particula., the maximum size reduction effect among the three-type of $79.1\%$(17 mm$\times$90 mm) was presented in zigzag-type compared with the rectangular microstrip patch antenna(MPA) with a height of 9 mm at the resonant frequency of 1.575 GHz. The gain showed -1.15 dBd, -10 dB bandwidth showed 6.2$\%$(98 MHz), and HPBW of E-plane showed $154^{\circ}$. As that result we could confirm that the 3-dimensional structure with attached Irises is the proper form for the miniaturization of microstrip antenna.

지방자치단체에 있어서의 행정기능 ; 교육행정

서정식 대한지방행정공제회 1958 地方行政 Vol.7 No.2

N/A N/A

Food Protein-Induced Enterocolitis Syndrome의 임상적 고찰

서정식,정혜리 대한소아청소년과학회 2001 Clinical and Experimental Pediatrics (CEP) Vol.44 No.7

韓國企業의 敎育訓練 實施狀況에 관한 硏究

徐廷植 단국대학교 대학원 1980 學術論叢 Vol.4 No.-

We can raise the productivity and have the organization combined by refreshing education for employees and the training of technics in the enterprise. Therefore the conventional concept of education that the education and training are managed for only new employees should be reconsidered. Especially nowadays enterprise should be grown and improved overcoming intense competition among enterprises and also we demand social responsibility to provide suitable goods and service by development of new technics and original idea. Therefore utmost efforts to manage the motive power, training education are inevitable for creative, efficient and productive perform of duty. The writer of this thesis is to summarize several urgent and rational schemes in order to improve problems derived from the examination and the analysis of present status of education. 1) The focus of education is based on the improvement of ability, mental education and technics training. It is more required to introduce methods of management of advanced countries into our methods of education. 2) Education plans should be managed well and effectively with the appreciative eye for future. 3) It is more effective to establish the department in charge and control division int he head office in order that all the employees can be participated in the education. 4) The budget for education should be composed enough and used well by the department in charge. 5) Evaluation of education should be reflected to personnel affairs to enhance the interest on education. 6) The Goal of education is to produce qualified enterprisers and the curriculum is designed to calculate for the spirit of enterprtse, virtue and technics. 7) The methods of management of advanced countries should be introduced and utilized aiming at the comprehension than cram in our curriculum.

임신 중기의 모체 혈청 Alpha-Fetoprotein치에 대한 연구

서정식,이언기,김기영,조용균,최훈,김복린,이홍균 인제대학교 1993 仁濟醫學 Vol.14 No.3

비정상적으로 높거나 낮은 임신 중기의 모체 혈청 alpha-fetoprotein치는 태아의 염색체 이상이나 신경판 결손 등과 관련이 있는 것으로 알려져 왔다. 한국 정상 임부에서 임신 중기 모체 혈청 alpha-fetoprotein의 정상치를 구하는데 도움이 되고 본원 고유의 정상 범위 설정을 위해 임신 중기의 각 임신 주수별 모체혈청 alpha-fetoprotein치의 중앙값 및 0.4, 2.5, 3.5MOM을 사용한 상한치와 하한치를 측정하였다. 본 연구에서는 3.5MOM이보다 높은 모체 혈청 alpha-fetoprotein치가 신경관 결손, 복벽 결손, 낭포성 하이그로마 같은 기형아와 관련이 있는 것으로 나타났다. Abnormally high and low levels of material serum alpha-fetoprotein(MSAFP) in the second trimester of pregnancy have been associated with various poor pregnancy outcomes such as neural tube defects and chromosomal abnormalities. A tonal of 659 patients participated in a maternal serum alpha-fetoprotein screening program in Inje University, Sanggye Paik Hospital between July 1, 1991 and December 31, 1992. The authors determined the median value of MSAFP on each gestational week of midpregnancy and established the cutoff value using 0.4, 2.5, 3.5 multiples of the median(MOM) for the determinations of normal range in Korean mother. In this study, MSAFP values higher than 3.5 multiples of the median(MOM) were associated with poor pregnancy outcomes such as neural tube defects, abdominal wall defects, and cystic hygroma.

제2 고조파 자기상관법에 입각한 다이오드 레이저 펄스의 측정 ( Pulse Width Measurement of Diode Laser Pulses Based on the Second Harmonic Autocorrelation Method )

서정식,이창희,신상영 대한전자공학회 1988 대한전자공학회 학술대회 Vol.1988 No.1