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제주재래흑돼지×Landrace F<sub>2</sub> 집단의 성장형질에 대한 교배조합의 효과
강용준,조상래,정동기,이재봉,박희복,조인철,한상현,Kang, Yong-Jun,Cho, Sang-Rae,Jeong, Dong Kee,Lee, Jae-Bong,Park, Hee-Bok,Cho, In-Cheol,Han, Sang-Hyun 한국수정란이식학회 2016 한국동물생명공학회지 Vol.31 No.1
This study was conducted to examine effects of mating type on the growth traits in an $F_2$ population produced by reciprocal intercrosses between Landrace and the Jeju Native Black pig (JBP). The $F_2$ progeny were produced by two different mating types based on the grand dams of founder breeds JBP (Cross_1) and Landrace (Cross_2). The body weights at 21 days after birth (BW21D) was significantly different between Cross_1 and Cross_2 (P<0.05), showing that the BW21D of Cross_1 has about 0.25 kg heavier than Cross_2. The significant differences were found between males and females for the growth traits including the body weights (BWB, BW21D, BW70D and BW140D) and average daily gains (ADG, eADG and lADG) (P<0.05). Males were heavier BWB, BW21D and BW140D levels, and higher ADG and lADG levels than females. On the other hand, females had heavier BW70D and higher eADG levels than those of males. When considering the mating types and sex simultaneously the Cross_2 males had the heaviest BW140D among the combinations of cross and sex. In conclusion, it is desirable to choose Landrace as grand dams in the reciprocal intercrosses between Landrace and JBP for producing their progeny construction and to plan the production of $F_2$ males for industrial purposes. These results suggested that it may be one of useful strategies to improve the productivity through out selection of the mating type of founder breeds and the progeny sex, especially in Landrace, JBP and their related populations.
1 GPa 급 고강도강 용접금속에서의 침상형 페라이트 핵생성 거동
강용준,이창희 대한용접접합학회 2019 대한용접·접합학회지 Vol.37 No.1
In this study, the nucleation behavior of acicular ferrite in 1 GPa class high strength steel weld metal was investigated. A 1 GPa class as-deposited weld metal specimen was prepared by single-pass welding using a prototype flux-cored wire, and a reheated weld metal specimen was obtained using Gleeble simulation technique. The typical inclusion in both specimens was composed of MnTi2O4 and amorphous. It was found that the inclusion potency for acicular ferrite nucleation was maximized in the as-deposited weld metal because of both the formation of Mn-depleted zone (MDZ) near the MnTi2O4 and the low interfacial energy between the MnTi2O4 and ferrite. In the reheated weld metal specimen, it was observed that the inclusion potency decreased possibly due to the homogenization of Mn in the MDZ that occurred during reheating thermal cycling.
고강도 저합금강 용접금속의 미세조직과 기계적 특성에 미치는 니켈 함량의 영향
강용준,장지훈,박상민,이창희,Kang, Yong-Joon,Jang, Ji-Hun,Park, Sang-Min,Lee, Chang-Hee 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.4
The microstructure and mechanical properties of the high-strength low-alloy steel weld metals with a variation of nickel content were investigated. The weld metals with a variation of nickel content from 2.3 to 3.3 wt% were prepared using Gas Metal Arc Welding process. The amount of acicular ferrite decreased with increasing nickel content; this is accompanied with an increase in the region of bainite and martensite, hence the hardness and tensile strengths were increased with the increase in nickel content, whereas the impact energy was deteriorated.
2.25Cr-1Mo강 용접 열영향부의 기계적 특성과 미세조직에 미치는 용접후열처리 온도의 영향
강용준,서강명,이준호,오창영,이승건 대한용접접합학회 2023 대한용접·접합학회지 Vol.41 No.3
The effect of post-weld heat treatment (PWHT) temperature on the mechanical properties of the heat-affected zone (HAZ) of 2.25Cr-1Mo steels was investigated. SA-387 Gr. 22 Cl. 2 steel was employed, and the specimens taken from the steel were thermally cycled using Gleeble to simulate the coarse-grained HAZ (CGHAZ), fine-grained HAZ (FGHAZ), and intercritical HAZ (ICHAZ). Before the PWHT, the simulated HAZs exhibited poor impact toughness as compared with the base metal. The base metal and simulated HAZ specimens were heat treated in a furnace at 610, 650, 690, and 730℃ for 8 h; their impact toughness improved significantly irrespective of the PWHT temperature. The microstructural changes owing to the PWHT were observed using scanning electron microscopy and correlated with the mechanical properties.
Characteristics of Cold Cracking in the Heat-Affected Zone of Carbon Steel
강용준,김정민,김기동,김남규,송상우 대한용접접합학회 2022 대한용접·접합학회지 Vol.40 No.6
The effects of hydrogen and microstructure on the cold cracking susceptibility of the heat-affected zone (HAZ) of carbon steel were investigated. Various carbon steel plates with tensile strengths of 400- and 500-MPa grade were employed, and the cold cracking susceptibilities of the HAZs were evaluated using implant tests. To investigate the effects of hydrogen and microstructure, implant test assemblies were produced with two types of welding electrodes (low-hydrogen and cellulose) and two different welding conditions (low and high heat inputs). The results indicate that the microstructure was more important than hydrogen in determining the cold cracking susceptibility of the HAZ of carbon steel.
강용준,Sang-Hyun Han,김상금,김수연,Hyeon Ah Kim,Yoo-Kyung Kim,Ji-Hyun Yoo,신문철,Byoung Chul Yang,박희복,이준헌,In Cheol Cho 한국축산학회 2023 한국축산학회지 Vol.65 No.3
This study examined the association between functional sequence variants (FSVs) of myosin heavy chain 3 (MYH3) genotypes and collagen content in a Landrace and Jeju native pig (JNP) crossbred population. Four muscles (Musculus longissimus dorsi, Musculus semimembranosus, Musculus triceps brachii, and Musculus biceps femoris) were used for the analysis of meat collagen content, and the same animals were genotyped for the FSVs of the MYH3 gene by using PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism). Three FSVs of MYH3 genotypes were identified and had genotype frequencies of 0.358, 0.551, and 0.091 for QQ, Qq, and qq, respectively. QQ animals for the FSVs of the MYH3 genotypes showed higher collagen content in their M. longissimus dorsi (p < 0.001), M. semimembranosus (p < 0.001), M. triceps brachii (p < 0.001), and M. biceps femoris (p < 0.001) than qq homozygous animals. After the validation of this result in other independent populations, the FSVs of MYH3 genotypes can be a valuable genetic marker for improving collagen content in porcine muscles and can also be applied to increase the amount of collagen for biomedical purposes.