• 제목/요약/키워드: Yield grade

검색결과 364건 처리시간 0.038초

Reliability studies on RC beams exposed to fire based on IS456:2000 design methods

  • Balaji, Aneesha;Aathira, M.S.;Pillai, T.M. Madhavan;Nagarajan, Praveen
    • Structural Engineering and Mechanics
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    • 제59권5호
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    • pp.853-866
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    • 2016
  • This paper examines a methodology for computing the probability of structural failure of reinforced concrete beams subjected to fire. The significant load variables considered are dead load, sustained live load and fire temperature. Resistance is expressed in terms of moment capacity with random variables taken as yield strength of steel, concrete class (or grade of concrete), beam width and depth. The flexural capacity is determined based on the design equations recommended in Indian standard IS456:2000. Simplified method named $500^{\circ}C$ isotherm method detailed in Eurocode 2 is incorporated for fire design. A transient thermal analysis is conducted using finite element software ANSYS$^{(R)}$ Release15. Reliability is evaluated from the initial state to 4h of fire exposure based on the first order reliability method (FORM). A procedure is coded in MATLAB for finding the reliability index. This procedure is validated with available literature. The effect of various parameters like effective cover, yield strength of steel, grade of concrete, distribution of reinforcement bars and aggregate type on reliability indices are studied. Parameters like effective cover of concrete, yield strength of steel has a significant effect on reliability of beams. Different failure modes like limit state of flexure and limit state of shear are checked.

연질밀(Triticum aestivum L. em Thell.)의 이화학적 특성과 sugar-snap cookie의 제조적성 (Physicochemical Properties and Sugar-Snap Cookie Making Potentialities of Soft Wheat Cultivars and Lines (Triticum aestivum L. em Thell.))

  • 이용숙;김종군;원준형;장학길
    • 한국식품과학회지
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    • 제34권5호
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    • pp.846-855
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    • 2002
  • 연질밀(Triticum aestivum L. em Thell.)로서 soft white spring(SWS) 밀과 soft white winter(SWW) 각각 10품종(또는 계통)을 공시재료로하여 종실의 이화학적 품질특성, 제분특 성, 호화특성, mixograph특성 및 sugar-snap cookie의 제조특성을 측정하고 이들 특성간의 상관관계를 구명하고자 일연의 실험을 실시한 바 그 결과를 보고한다. Single Kernel Characterization System(SKCS) kernel hard-ness와 용적중, near-infrared reflectance(NIR) hardness와는 각각 $r=0.947^{*},\;r=0.495^{*}$의 정의 상관이 있었으며 SKCS weight와 SKCS size와는 $r=0.942^{**}$의 고도의 정의 상관이 있었다. 용적중과 straight-grade flour yield, break flour yield, 밀가루 회분 함량 및 제분평점과는 각각 $r=0.720^{**},\;r=0.490^{*},\;r=-0.781^{**}$$r=0.838^{**}$ 의 고도의 정 또는 부의 상관이 있었다. 종실의 단백질 함량과 straight-grade flour yield, break flour yield 밀가루 회분 함량 및 제분평점은 각 각 $r=-0.786^{**},\;r=-0.765^{**},\;r=-0.889^{**}$$r=-0.938^{**}$로 서 고도의 정 또는 부의 상관이 있었으며 이와 같은 현상은 밀가루 단백질 함량에서 동일한 결과를 보였다. Mixograph 흡수을과 제분특성과는 고도의 정 또는 부의 상관이 있었으며, 특히 종실의 단백질 함량과는 $r=0.938^{**}$, 밀가루의 단백질 함량과는 $r=0.901^{**}$의 고도의 정의 상관이 있었다. Cookie 직경과 cookie top grain score는 $r=0.946^{**}$의 고도의 정의 상관이 있었다. Cookie특성과 제분특성, 단백질 함량 및 mixograph 흡수율과는 고도의 정 또는 부의 상관이 있었으나 전분특성과는 단지 swelling volume과 cookie top grain score 만이 $r=0.447^{*}$의 정의 상관이 있었다.

경사도별 3요소 시용수준이 겉뿌림 산지초지에 미치는 영향 I. 총건물수량 , 수량구성요소 및 식생구성비율의 변화 ( Effects of Nitrogen , Phosphorus and Potassium Application Rates on Oversown Hilly Pasture under Different Levels of Inclination I. Changes in th

  • 정연규;이종열
    • 한국초지조사료학회지
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    • 제5권3호
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    • pp.191-195
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    • 1985
  • 산지경사도(山地傾斜度)($10^{\circ},\;20^{\circ},\;30^{\circ}$) 및 3요소(要素)($N-P_2O_5-K_2O$) 시용수준(施用水準)(0-0-0, 14-10-10, 28-25-25, 42-40-40kg/10a) 별(別) 겉뿌림 산지초지(山地草地)의 조성(造成), 생산성(生産性), 식생(植生) 및 목초품질등(牧草品質等)에 미치는 영향(影響)을 구명(究明)하였다. 식생구성비율(植生構成比率)에 관(關)해 검토(檢討)하였다. Orchardgrass, Tall fescue, Redtop, Ladino clover를 혼파(混播) 수년초지(水年草地)의 2년간(年間) 시험결과(試驗結果)는 ; 1. 경사도(傾斜度)가 증가(增加)함에 따라서 총건물수량(總乾物收量), 구성초종중(構成草種中) 화본과목초(禾本科牧草) 및 두과목초(荳科牧草)의 수량(收量)은 유의성(有意性)있게 크게 감소(減少)되었으나 잡초수량(雜草收量)은 유의차(有意差)가 없었다. 또한 경사도(傾斜度)가 높아짐에 따라서 파종목초(播種牧草)의 정착율(定着率)이 잡초(雜草)에 비(比)해서 상대적(相對的)으로 낮았다. 2. 3 요소수준(要素水準)의 증가(增加)는 총수량(總數量), 구성초종중(構成草種中) 화본과목초(禾本科牧草)의 수량(收量) 및 목초율(牧草率)을 크게 증가(增加)시켰으나, 잡초(雜草)의 수량변화(收量變化)는 경미(輕微)하였다. 두과목초(荳科牧草)의 수량(收量)은 질소(窒素) 소비수준(少肥水準)에서 가장 높았으며 높은 3 요소수준(要素水準) (특(特)히 질소영향(窒素影響))에서는 감소(減少)되었다. 3. 경사도(傾斜度)에 따라서 생산성(生産性), 수량구성요소(收量構成要素) 및 시비효율이 다른 특성(特性)을 나타내므로 혼파초종(混播草種)의 선택(選擇), 파종량(播種量), 시비량(施肥量), 초지조성(草地造成) 및 관리이용(管理利用) 방법(方法)에 차이(差異)를 두어야 할 것이다.

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가을파종시기가 사초용 연맥의 생육특성, 수량 및 사료가치에 미치는 영향 (Effects of Different Seeding Dates on the Agronomic Characteristics , Forage Yield and Quality of Fall Sown Oats)

  • 김종관;김동암
    • 한국초지조사료학회지
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    • 제13권3호
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    • pp.195-202
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    • 1993
  • This experiment was carried out to investigate the eft'ects of different seeding dates on the agronomic characteristics, forage yield and quality of fall sown cats(Avena sativa L.). The experiment was conducted at the forage experimental field, Seoul National University. Suweon in 1990. The results obtained are summarized as follows; 1. Present data indicated that plant and ear heights were decreased as the seeding date was delayed. Dry matter accumulation was increased due to the higher plant and ear heights. 1. When oats was seeded on August 20. the first heading and 50% heading dates were recorded on October 4 and 15, respectively. And when oats was seeded on August 25. the first heading and 5 0'!4 heading dates were observed on October 13 and 18. respectively. As seeding date was delayed for one day. the heading date was delayed for two days. 3. The dry mattcr percentage of oats seeded on August 20 was 20.1%, but that of oats seeded after August 10 was 15.1 to 16.7%. 4. According to the contents of CP. ADF and NDF, oats seeded on August 20 and 25 was evaluated to be the 3rd or 4th grade hay. and the other oats sceded after August 15 was recorded the 2nd or 3rd grade hay as proposed by AFGC. 5. There are no significant dry matter yield differences among the seeding dates of oats such as August 20, 25 and 30. but a significant yield difference was recorded between oats seeded in August and September. The same trend as the dry matter yield was observed in in vitro digestible dry matter and crude protein yields of oats seeded in August and September. According to the results. early seeding of early matuaring oats may be a better option than late seeding after August 30 for silage or hay production following silage corn harvest in the middle northern area of Korea.

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유방암 세침흡인의 세포학적 소견 - 세포학적 소견과 조직학적 소견, 병기 및 림프절 전이 상태와의 비교 - (Cytologic Findings of Breast Carcinoma in Fine Needle Aspiration - Comparison with Histologic Findings, Stage and Lymph Node Metastasis -)

  • 장희진;김덕환;팽성숙;양성은;손진희;서정일;박효숙
    • 대한세포병리학회지
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    • 제6권1호
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    • pp.18-26
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    • 1995
  • In order to compare cytologic findings ol breast carcinoma in fine needle aspiration cytology (FANC) with histologic findings and prognostic factors including histologic grading, lymph node metastasis and stage, 79 cases of infiltrating ductal carcinoma diagnosed by FANC and confirmed by histology were analysed. We especially attempted to col relate nuclear grade, cellularity and smear pattern with histologic grade, type, status of lymph node metastasis and stage. The results are as fellows. 1. High nuclear grade was correlated with high histologic grade, lymph node metastasis and advanced stage. 2. Individual cell pattern was more frequently identified in high histologic grade and scirrhous or solid-tubular type than in low histolgic grade and papillotubular type. 3. Cellularity increased with higher histologic grade and lymph node metastsis. However cellularity was low in scirrhous type. 4. There is no relationship between nuclear grade and histologic type, between smear pattern and lymph node metastasis or stage, and between cellularity and stage. These results suggest that cytologic findings of breast carcinoma such as nuclear grade, cellularity and smear pattern are indicative of histologic findings in relation to histolgic grade and type. Especially, nuclear grade of FANC may yield valuable prognostic information.

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Genetic Parameter Estimates of Carcass Traits under National Scale Breeding Scheme for Beef Cattle

  • Do, ChangHee;Park, ByungHo;Kim, SiDong;Choi, TaeJung;Yang, BohSuk;Park, SuBong;Song, HyungJun
    • Asian-Australasian Journal of Animal Sciences
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    • 제29권8호
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    • pp.1083-1094
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    • 2016
  • Carcass and price traits of 72,969 Hanwoo cows, bulls and steers aged 16 to 80 months at slaughter collected from 2002 to 2013 at 75 beef packing plants in Korea were analyzed to determine heritability, correlation and breeding value using the Multi-Trait restricted maximum likelihood (REML) animal model procedure. The traits included carcass measurements, scores and grades at 24 h postmortem and bid prices at auction. Relatively high heritability was found for maturity ($0.41{\pm}0.031$), while moderate heritability estimates were obtained for backfat thickness ($0.20{\pm}0.018$), longissimus muscle (LM) area ($0.23{\pm}0.020$), carcass weight ($0.28{\pm}0.019$), yield index ($0.20{\pm}0.018$), yield grade ($0.16{\pm}0.017$), marbling ($0.28{\pm}0.021$), texture ($0.14{\pm}0.016$), quality grade ($0.26{\pm}0.016$) and price/kg ($0.24{\pm}0.025$). Relatively low heritability estimates were observed for meat color ($0.06{\pm}0.013$) and fat color ($0.06{\pm}0.012$). Heritability estimates for most traits were lower than those in the literature. Genetic correlations of carcass measurements with characteristic scores or quality grade of carcass ranged from -0.27 to +0.21. Genetic correlations of yield grade with backfat thickness, LM area and carcass weight were 0.91, -0.43, and -0.09, respectively. Genetic correlations of quality grade with scores of marbling, meat color, fat color and texture were -0.99, 0.48, 0.47, and 0.98, respectively. Genetic correlations of price/kg with LM area, carcass weight, marbling, meat color, texture and maturity were 0.57, 0.64, 0.76, -0.41, -0.79, and -0.42, respectively. Genetic correlations of carcass price with LM area, carcass weight, marbling and texture were 0.61, 0.57, 0.64, and -0.73, respectively, with standard errors ranging from ${\pm}0.047$ to ${\pm}0.058$. The mean carcass weight breeding values increased by more than 8 kg, whereas the mean marbling scores decreased by approximately 0.2 from 2000 through 2009. Overall, the results suggest that genetic improvement of productivity and carcass quality could be obtained under the national scale breeding scheme of Korea for Hanwoo and that continuous efforts to improve the breeding scheme should be made to increase genetic progress.

상아질 삭제기구가 자가부식 접착제의 결합강도에 미치는 효과 (EFFECT OF CUTTING INSTRUMENTS ON THE DENTIN BOND STRENGTH OF A SELF-ETCH ADHESIVE)

  • 이영곤;문소라;조영곤
    • Restorative Dentistry and Endodontics
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    • 제35권1호
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    • pp.13-19
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    • 2010
  • 이 연구는 다이몬드 포인트와 카바이드 버 및 SiC paper로 삭제한 상아질에 대한 자가부식 프라이머 접착제의 결합강도를 비교하고, 실험실에서 사용하는 SiC paper와 유사한 결합강도를 나타내는 회전용 삭제기구를 알아보기 위하여 시행하였다. 56개의 발거된 대구치 치관의 교합면 상아질을 노출시켜 1.2 mm의 두께의 시편을 제작한 후 8개의 군으로 분류하였다. 1군은 standard diamond point (TF-12), 2군은 fine diamond point (TF-12F). 3군은 extrafine diamond point (TF-12EF), 4군은 cross-cut carbide bur (no. 557), 5군은 plain-cut carbide bur (no. 245), 6군은 P 120-grade SiC paper, 7군은 P 220-grade SiC paper, 8군은 P 800-grade SiC paper를 사용하여 각 시편의 상아질 표면을 약 0.2 mm정도 삭제하였다. 상아질 표면에 Clearfil SE Primer와 Bond를 적용하고 Tygon tube를 이용하여 Clearfil AP-X를 충전하고 40초간 광조사 하였다. 제작된 시편은 만능시험기를 이용하여 를 미세전단 결합강도는 측정한 후, 각 군의 결합강도를 one-way ANOVA와 Tukey검정을 이용하여 분석하여 다음과 같은 결과를 얻었다. 자가부식 프라이머 접착제 사용 시 상아질에 대한 개선된 접착을 위해서는 초미세입자 다이아몬드 포인트의 사용이 추천되며, 실험실적인 연구에서 P 220-grade SiC paper의 사용은 미세입자 다이아몬드 포인트나 카바이드 버로 삭제한 상아질 면과 유사한 결합강도를 나타내었다.

순도가 향상된 금속급 실리콘 제조를 위한 산침출 연구 (A Study of Acid Leaching for Metallurgical Grade Silicon Manufacturing Improved Purity)

  • 엄명헌;하범용
    • 한국산학기술학회논문지
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    • 제18권11호
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    • pp.118-123
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    • 2017
  • 다양한 산업에 사용되고 있는 금속급 실리콘(MG-Si, Metallurgical grade silicon)을 제조하기 위해 실리콘 원료 내 가장 많이 함유하고 있는 불순물인 알루미늄(Al) 및 철(Fe)을 제거하고자 산(Acid) 침출 실험을 수행하였다. 5가지 종류의 산(HCl, HF, H2SO4, HNO3, H3PO4)을 1, 2, 4, 6M로 조제하여 실리콘 원료에 반응시킨 결과, 1M 농도의 HF가 가장 우수한 Al 및 Fe 제거율을 나타내었으며 각각 97.9%와 95.2로 나타났다. 그러나 HF는 실리콘 부식 특성으로 인해 18% 가량의 수율 감소가 발생하였으며 이러한 수율감소를 최소화하기 위해 두 번째로 제거율이 우수하게 나타난 2M HCl과 혼합하여 실리콘 원료에 적용하였다. 혼합용액의 최적조건을 선정하기 위해 실험을 수행하여 $80^{\circ}C$, 2시간의 침출 최적조건으로 결정되었으며 이 혼합용액의 적용 결과 Al 및 Fe 잔류농도가 각각 141 ppmw 및 93ppmw로 나타나 3N급의 순도를 갖는 금속급 실리콘을 제조하기에 매우 용이한 것으로 확인되었다.

Heritabilities and Genetic Correlation, and Sire and Environment Effects on Meat Production Potential of Hanwoo Cattle

  • Baik, D.H.;Hoque, M.A.;Park, G.H.;Park, H.K.;Shim, K.S.;Chung, Y.H.
    • Asian-Australasian Journal of Animal Sciences
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    • 제16권1호
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    • pp.1-5
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    • 2003
  • Genetic parameters of live weight at slaughter (LWT), quantity index (QIX), yield grade (YGD), quality grade (QGD), pH of meat, and boiled meat tenderness in terms of mastication (BMAS), shear force (BSFR) and penetration (BPEN) in Hanwoo steers were estimated. Effects of sire, location and their interaction on these traits were also evaluated. Sire effects were found to be significant on all the traits studied except for pH and BSFR. The LWT, QIX and QGD were also significantly affected both by location and by interaction effect between sire${\times}$location. The BSFR and BPEN were significantly (p<0.01) affected by location but not significantly by sire${\times}$location interaction. The boiled meat tenderness and pH were negatively correlated ($r_g$ and $r_p$) with LWT, QIX and QGD. All the other traits were positively correlated with each other. Positive and high genetic correlation (+0.56) between LWT and QGD was obtained indicating that selection for LWT would improve QGD. The $h^2$ estimates were 0.43, 0.37, 0.37, 0.35 and 0.32 for QGD, LWT, pH, BSFR and BPEN, respectively.