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풀사료 수량예측모델의 온도 정밀도 향상을 위한 일평균온도 추정 가능성 검토
강신곤,조현욱,김지융,김경대,이배훈,김병완,성경일 한국초지조사료학회 2021 한국초지조사료학회지 Vol.41 No.1
This study was conducted to determine the possibility of estimating the daily mean temperature for a specific location based on the climatic data collected from the nearby Automated Synoptic Observing System (ASOS) and Automated Weather System(AWS) to improve the accuracy of the climate data in forage yield prediction model. To perform this study, the annual mean temperature and monthly mean temperature were checked for normality, correlation with location information (Longitude, Latitude, and Altitude) and multiple regression analysis, respectively. The altitude was found to have a continuous effect on the annual mean temperature and the monthly mean temperature, while the latitude was found to have an effect on the monthly mean temperature excluding June. Longitude affected monthly mean temperature in June, July, August, September, October, and November. Based on the above results and years of experience with climate-related research, the daily mean temperature estimation was determined to be possible using longitude, latitude, and altitude. In this study, it is possible to estimate the daily mean temperature using climate data from all over the country, but in order to improve the accuracy of daily mean temperature, climatic data needs to applied to each city and province.
강신곤 한국초지조사료학회 2022 한국초지조사료학회지 Vol.42 No.2
This study was carried out to evaluate the seeding date and performance of early maturing rye cultivars for the Dry matter yield (DMY) and nutritive value during 2016 and 2017 in Yeongseo region of Gangwondo, South Korea. The experimental field was designed as a split-plot arrangement. The treatments were two planting dates on September 25 and October 02 as the main plots, and two cultivars of forage rye including Gogu and Koolgrazer as sub-plots. The cultivars were harvested on April 26 at the heading stage of both years. In this experiment, the sowing dates and cultivars of the forage rye did not effect on DMY. The DMY had no significant differences among the cultivars of forage rye and seeding date of both years. Similarly, no significant difference was observed in the DMY of Gogu and Koolgrazer in both seeding date and years. The CP, NDF, ADF, and RFV had no significant differences among the cultivars of forage rye and seeding date of both years. Considering the DMY and nutritive value of the current experiment, seeding of forage rye cultivars Gogu and Koolgrazer on September 25 and October 2 could be used as an recommended seeding date at northern area. In addition, based on the climate characteristics of the region, both cultivars had relatively similar forage yield and quality that makes them to be recommended for cultivation in the region. This study is meaningful in that DMY was first presented in Yeongseo region where there is no cultivation data for forage rye.
가루, 크럼블 및 펠렛사료 급여가 브로일러육의 이화학적특성에 미치는 영향
조헌조,강신곤,차용호,김병기,우선창,여영수 한국동물자원과학회 2002 한국축산학회지 Vol.44 No.5
본 시험은 대형육계에 있어서 생산체계를 조사하기 위하여 영양수준(2∼3주령, ME 2,843㎉/㎏, 체 19.46%; 4∼6주령, ME 3,072㎉/㎏, 체 17.85%; 7∼8주령, ME 3,109㎉/㎏, 체 17.26%)에 따른 사료가공형태(대조구: 가루→크럼블→펠렛 ; 처리1구 : 가루→크럼블→펠렛 ; 처리2구 : 크럼블→크럼블→펠렛 ; 처리3구 : 펠렛→펠렛→펠렛)로 활성탄(1%)을 혼합첨가하여 8주(56일간)동안 실험한 결과는 다음과 같다. 계육의 일반성분에서 조단백질 함량이 22.22∼23.40%였고, 조지방 함량은 0.30∼0.45% 범위로서 처리구가 낮았으며, 특히 처리2구는 0.28로서 가장 낮았다(P<0.05). 계육의 가열감량은 대조구가 높은 경향이었고, 전단력과 pH는 처리3구가(1.21㎏, 5.85) 낮은 경향이었다. 육색에서 명도(L)는 대조구와 처리2구가 가장 밝았고, 적색도(a)는 0.19∼0.85의 범위였고, 황색도(b)는 처리1구가 가장 낮았다. 관능검사와 조직감, 향미에서 시험구간에서는 유의차는 없었다(P<0.05). 지방산에서의 myristic acid와 arachidoic acid는 처리1구가, oleic acid과 지방의 불포화도가 처리2구가 가장 높았다(P<0.05). 또한 아미노산에서 cystine, glutamic acid, valine, iso-leucine, leucine, lysine, arginine은 처리1구와 처리2구가 다른 처리구보다 높게 나타났다(P<0.05). This study was conducted to investigate the effect of nutrient level (metabolizable energy and crude protein, 2,843㎉/㎏ and 19.46% at 2 to 3 week, 3,072㎉/㎏ and 18.38% at 4 to 6 week, 3,109㎉/㎏ and 17.26% at 7 to 8 week, respectively, and feeding form was ground → crumble → pellet in control, ground → crumble → pellet in treatment 1, crumble → crumble → pellet in treatment 2, pellet → pellet → pellet in treatment 3 for broiler during 8 weeks. Also the effects of supplemented with charcoal(1%) in total mixed treatment feed was investigated. The crude protein, crude fat in broiler meat range from 22.22∼23.40%, and 0.30∼0.45%, respectively. Especially, treatment 2 was lower than other treatment (P<0.05). The heating loss tend to be increased at control. Shear force and pH tend to be decreased at T3(1.21㎏, 5.89). Control and T2 were significantly lighter in color (“L”) than the T1 and the “a” ranged from 0.19∼0.85 and T1 was the lowest “b” among other treatment. The panel test, texture, Aroma were not significantly among the an experimental group (P<0.05). Myristic acid and arachidonic acid of T1 was significantly higher than that other treatment and oleic acid, U/S(unsaturated/ saturated) rate T2 was significantly higher than other experimental group(P<0.05). Among amino acid, cystine, glutamic acid, valine, iso-leucine, leucine, lysine, arginine in T1 and T2 was higher than control and T3.
Fabrication of Fe-Cr-Mo Powder Metallurgy Steel via a Mechanical-Alloying Process
박주영,정고원,강신곤,이석재,최현주 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.6
In this study, we employed a mechanical–alloying process to manufacture low-alloy CrL and CrM steel powders that have similar specifications to their water-atomized counterparts. X-ray diffraction showed that Mo and Cr are alloyed in Fe after four cycles of planetary milling for 1 h at 150 RPM with 15-min pauses between the cycles (designated as P2C4 process). Furthermore, the measured powder size was found to be similar to that of the water-atomized counterparts according to both scanning electron microscope images and laser particle size analysis. The samples were sintered at 1120 °C, after which the P2C4-milled CrL showed similar hardness to that of water-atomized CrL, whereas the P2C4-milled CrM showed about 45% lower hardness than that of its water-atomized counterpart. Water-atomized CrM consists of a well-developed lathtype microstructure (bainite or martensite), while a higher fraction of polygonal ferrite is observed in P2C4- milled CrM. This phase difference causes the reduction of hardness in the P2C4-milled CrM, implying that the phase transformation behavior of specimens produced via powder metallurgy is influenced by the powder fabrication method.
Tempcore 공정을 통해 제조된 600MPa급 철근의 두께방향 미세구조 변화 분석
박지원,김현지,강신곤 한국열처리공학회 2023 熱處理工學會誌 Vol.36 No.6
600 MPa-grade deformed bar samples were manufactured by conventional hot rolling and subsequent Tempcore heat treatment processes. Considering the short-time water quenching step of the Tempcore process for hot-rolled steel, it is inevitable that the temperature profile of the deformed bar depends strongly on its position throughout the sample thickness. As a result, its microstructure can be easily divided into two regions, the surface and the core regions. The former is expected to have a fresh martensite microstructure under rapid cooling conditions, but self-tempering occurs due to the intense heat flow from the hot core region after the process. The latter is generally known to exhibit a mixed microstructure of ferrite and pearlite due to its slow cooling rate. In this study, detailed microstructural evolutions were examined through the thickness direction. The large variation of the microstructure through the thickness direction in the deformed bar samples is partly due to the easy carbon diffusion from the limited additions of alloying elements.