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TRIP형 복합조직강판의 기계적특성에 미치는 열처리 방법
이상훈,이영섭,김용성,박현순 ( S . H . Lee,Y. S . Lee,Y . S . Kim,H . S . Park ) 한국열처리공학회 1997 열처리공학회지 Vol.10 No.2
The formation processes of the retained sustenite(γ_R) in SHCP100 steel sheets were investigated in order to improve the transformation induced plasticity(TRIP) effect of γ_R. An excellent combination of elongation about 23% and high strength over 830 ㎫ was achieved by processing of intercritical annealing and isothermal holding. The mechanical properties of TRIP-aided dual phase steel was found to depend on the volume ratio of each phase and the volume fraction of γ_R. It was also noted that the proper mechanical stability of γ_R improved the mechanical properties. In this work, the best balance of strength-ductility was obtained by holding the steel at 420℃ for 500sec. after annealing at 730℃ for 300 sec.
이인혁(I-H Lee),송성근(S-G Song),이상훈(S-H. Lee),박성준(S-J Park),남해곤(H-G Nam),정해덕(H-D Chung),장영학(Y-H Chang) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper, we proposed the electric circuit using one common arm of H-Bridge Inverters to reduce the number of switching component in multi-level PWM inverter combined with H-Bridge Inverters and Transformers. and we proposed the switching method that can be same rate of usage at each transformer. Also, we tested the proposed prototype inverter to clarify the proposed electric circuit and reasonableness of control signal.
PCR 기법을 이용한 한국재래산양의 α s2-casein 유전자의 특성
상병찬(B . C . Sang),김지애(J . A . Kim),이상훈(S . H . Lee),서길웅(G . W . Seo),한성욱(S . W . Han) 한국축산학회 2000 한국축산학회지 Vol.42 No.4
This study was performed to provide the basic data for preservation and improvement of genetic resources according to finding genetic construction obtained from the analysis of genetic characteristics of α_(S2-) casein gene in Korean Native goat using PCR-RFLP. This study confirmed the amplified product of 1.3kb fragment obtained from the amplification of a α_(S2-)casein loci by PCR. The frequency of a α_(S2-)casein genotype in Korean Native goat was 100% for AA type and the frequencies of a α_(S2-)casein genotype in Saanen were 80 and 20% for AA and AB genotypes. The frequency of a α_(S2-)casein A allele was 1.000 in Korean Native goat, and the frequencies of a α_(S2-)casein A and B alleles were 0.900 and 0.100 in Saanen, respectively. The nucleotide sequence of a α_(S2-)casein gene of Korean Native goat was 99.0% homology with 12 nucleotide sequences difference of that of goat reported in GeneBank(AJ238965.1, AJ238967.1) and was 95.0% homology with 57 nucleotide sequences difference of that of Holstein reported in Gene Bank(M94327). Therefore, this study of molecular genetic characteristics by the analysis of genetic polymorphisms and sequences for a α_(S2-)casein gene should be used as basic data for preservation and improvement of genetic resources in Korean Native goat breeding.
저장벽 양자우물구조와 비태칭 패브리 - 페로 공명기 구조에 의한 고성능 2×4 S-SEED Array 구현
권오균(O. K. Kwon),최영완(Y. W. Choi),김광준(K. J. Kim),이일항(E. H. Lee),이상훈(S. H. Lee),원용협(Y. H. Won),유형모(H. M. Yoo) 한국광학회 1994 한국광학회지 Vol.5 No.1
GaAs/Al_(0.04)Ga_(0.96)As 다중양자우물 구조를 이용한 반사형 PIN 다이오우드 S-SEED의 설계에 있어 낮은 동작전압, 높은 포화에너지 및 높은 반사율 on/off 강도비를 얻고자 저장벽 양자우물구조와 비대칭 페브리-페로 공명구조를 결합하였다. 2×4 array를 구성하는 S-SEED들은 역방향 동작전압 5V에서 평균적으로 13 이상의 반사율 on/off 강도비 (CR)와 약 24%의 반사율차 (ΔR) 및 91% 이상의 광쌍안정폭 (Δ)을 나타내었다. 공명구조를 이용함으로서 PIN 다이오우드 진성영역내의 양자우물의 주기수를 줄일 수 있어 외부동작전압 없이도 CR~4.7, R~9.2%, ~22%의 향상된 무전압 광쌍안정 동작특성을 얻었다. We designed and fabricated a 2×4 symmetric self electro-optic effect device array using GaAs/Al_(0.04)Ga_(0.96)As extremely shallow quantum wells grown by a molecular beam epitaxy. By employing ESQW and asymmetric Fabry-Perot cavity structure simultaneously, we improved the performances of S-SEED such as on/off contrast ratio (CR), reflectivity change (ΔR), and optical bistability loop width (Δ). The average values of the elements of the 2×4 S-SEED array were CR~13.1, R~24%, and Δ~91%. It was found that the AFP cavity structure enhances the self-biased optical bistability in ESQW-SEED under no external bias. That is due to the decreased intrisic region thickness in AFP-SEED structures, and which increases the built-in electric fields. The zero-biased S-SEED showed CR of ~4.7, R~9%, and Δ~22%.
RAPD기법을 이용한 축우의 유전적 다형성과 유사도 분석
이상훈,서길웅,권일,성창근,김선균,상병찬,Lee, S.H.,Seo, K.W.,Kwon, I.,Sung, C.K.,Kim, S.K.,Sang, B.C. 충남대학교 농업과학연구소 1999 Korean Journal of Agricultural Science Vol.26 No.2
This study was carried out to investigate the difference and genetic similarity at the level of molecular genetics. Genomic DNA was extracted from blood of Holstein, Korean cattle, Charolais, and hybrid between Korean cattle and charolais and RAPD(random amplified polymorphic DNAs) was analyzed by PCR(polymerase chain reaction). After genetic similarity value from different breeds are analyzed, genetic similarity was estimated by UPGMA(unweighted pair-group method using average). The results obtained from this study can be summarized as follows: 1. When genomic DNA which was extracted from different breeds was subjected to electrophoresis on 1.5% agarose gel, bigger than 12.2kb was appeared. Ratio by absorbance of $A_{260}/A_{280}$ was 1.75~2.10, indicating that genomic DNA was quite pure for RAPD analysis. 2. Different band patterns by RAPD were appeared according to the breeds in cattle. The best primer used to distinguish Holstein from other breeds was 5'-GAC CGC TTG T-3'. 3. A 340bp fragment was amplified in $33.0^{\circ}C$ of annealing temperature for the Holstein and Charolais breeds, but any amplification was not occurred in this annealing temperature for Korean cattle and hybrid. In addition, a 340bp fragment was amplified in $37.5^{\circ}C$ of annealing temperature for the Holstein and Korean cattle, but any amplification was not occurred in this annealing temperature for Charolais and hybrid. For the reaction of PCR. $37.5^{\circ}C$ and $33.0^{\circ}C$ of annealing temperature was shown to be best for genetic marker identification from Holstein, Charolais, and hybrid between Korean cattle and Charolais. 4. When genetic similarity from different breeds are analyzed at the both temperature of $33.0^{\circ}C$ and $37.5^{\circ}C$, the genetic similarity value of Holstein and Korean cattle, Holstein and Charolais, Korean cattle and Charolais, and Korean cattle and hybrid were 0.666~0.777, 0.615~0.666, 0.400~0.461 and 0.857~0.888, respectively. 5. It could be concluded that different breeds are capable of distinguishing by RAPD used random primer 5'-GAC CGC TTG T-3', genetic similarity from different breeds was appeared the higher genetic similarity value of Korean cattle and Charolais than that of Holstein between Korean cattle and Charolais by UPGMA.
SRM 인버터의 병렬 스위칭을 위한 새로운 스위칭 패턴
이상훈(S. H. Lee),이상훈(S. H. Lee),정성우(S. W. Jung),임헌호(H. H. LIM),박성준(S. J. Park),안진우(J. W. Ahn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A SRM inverter has very low switching frequency, This results m reducing the burden for a high-speed of the gate-amp interface circuit. and the linearity of optocoupler is used to protect the intanteneous peak current for the stable operation<br/> In this paper, series resistor is used to equal the current sharing of each switching device and a linear gate-amp is proposed to protect the intanteneous peak current which occurs in transient state.