• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.311-311
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• 2017

The relationships between rice grain filling and air temperature of maturing period in paddy field were analyzed to evaluate the effects of climatic change on rice productivity in Korea. Data of air temperature of 31, 41 and 51 days after heading(DAH) for 11 years from 2002 to 2016 were collected and analyzed to determine the effects on rice yield and yield component related traits of Chucheogbyeo, popular cultivar in Gyeonggi province in Korea. As the results, ripening ratio was closely correlated with the mean of daily maximum temperature (DMAT $r=0.71^*$), the mean of daily temperature difference (DTD, $r=0.67^*$) of 41 DAH and DTD ($0.65^*$) of 51 DAH. Weight of 1,000 paddy rice grains was closely correlated with accumulated sunshine hours (ASH) of 31 ($r=0.84^{**}$), 41 ($r=0.75^{**}$), 51 ($r=0.72^*$) DAH. Brown rice grain weight recovery ratio was closely correlated with DTD ($r=0.76^{**}$) and ASH ($r=0.84^{**}$) of 31 DAH, DMAT ($r=0.75^{**}$, $r=0.79^{**}$), DTD ($r=0.79^{**}$, $r=0.77^{**}$) and ASH ($r=0.81^{**}$, $r=0.79^{**}$) of 41 and 51 DAH. Paddy rice yield was closely correlated with MDT ($r=-0.63^*$) of 31 DAH, mean of daily minimum temperature (DMIT, $r=-0.83^{**}$, $r=-0.70^*$), DTD ($r=0.71^*$, $r=0.62^*$) of 31 and 41 DAH. Brown rice yield was correlated closely with DMIT ($r=-0.86^{**}$, $r=-0.73^*$) and DTD ($r=0.80^{**}$, $r=0.72^*$) of 31, 41 DAH, and DTD ($r=0.69^*$) of 51 DAH. Milled rice yield was correlated closely with DMIT ($r=-86^{**}$, $r=-0.73^*$), DTD ($r=0.79^{**}$, $r=0.71^*$) of 31, 41 DAH, and DTD ($r=0.68^*$) of 51 DAH.

• 한국토양비료학회지
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• 제13권4호
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• pp.99-105
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• 1981

인삼(人蔘)의 생육(生育)에 적합(適合)한 토양화학성분별 함량(含量)과 이들과 인삼(人蔘)의 생육(生育) 및 수량(收量)과의 관계를 구명(究明)코저 인삼주산지(人蔘主産地) 강화외(江華外) 4개군(個郡)의 농가포장(農家圃場)(홍삼포(紅蔘圃)) 49개소(個所)을 조사(調査)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 인삼(人蔘)의 생육(生育) 및 수량(收量)과 상관관계가 있는 화학성분별 함량(含量)은 우량포지(優良圃地)에서 CEC가 8.9~14.5me/100g, 유기물(有機物) 1.5~3.5% 유효인산 45~257ppm, 가리(加里) 0.34~0.55me/100g이었고, K/P비(比)는 0.002~0.012이었다. 2. 이들중 CEC, 유기물(有機物), 치환성가리(置換性加里) 및 K/P비(比)는 수량(收量)과 정상관을 CEC는 생육상황과 유의성(有意性)있는 상관을 나타냈으며, 유효인산은 수량(收量)과 부(負)의 상관을 보여주었다. 3. 임삼포지(人蔘圃地)의 K/P비(比)와 수량(收量)과는 고도(高度)의 정상관을 보여주어 인삼엽중(人蔘葉中)의 K/P비(比)와 수량(收量)과의 밀접(密接)한 관계가 있음을 보여 주었다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.198-198
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• 2017

Cultivated varieties of sweet potato were from dry texture type to tender texture type on the basis of consumer preferences. There are many differences in the quantity of sweet potato, starch content, pigment, and sugar content depending on the cultivation season and area, even in the same variety. Therefore, in this study, we attempted to establish optimum time of harvesting through growth characteristics and variation in component like starch, sugar, polyphenol and flavonoid. Four sweet potato varieties were used in this experiment. Among them, Jinhongmi (JHM) & Yulmi (YM) were as dry texture type and Pungwonmi (PWM) & Hogammi (HGM) were as tender texture type. Sweet potatoes were transplanted on 23 May, 2016 and were investigated storage root weight and component contents every 20 days from 60 days to 120 days and surveyed yield at 110, 120, 130 days after transplantation. Result revealed that storage root weight of YM, JHM, and HGM were 30.1, 38.9, 20.8 g respectively in 60 days after transplanting. Storage roots of PWM gerw faster with the weight of 88.2 g. In 120 days after transplanting, storage root weight varied from 88.3 to 118.7 g, HGM was the smallest, and PWM was the largest. Sugar contents of sweet potato ranged from 21.0 to $23.8Brix^{\circ}$ in 60 days after transplanting and from 27.5 to $30.78Brix^{\circ}$ in 120 days after transplanting. In particular, the sugar content of HGM was the highest over $30Brix^{\circ}$ after 80 days. The starch content of dry texture type (YM, JHM) increased from 15.5% to 20.4% and tender texture type (PWM, HGM) increased from 11.0% to 17.3%. Starch content tended to be high in dry type sweet potatoes. The content of polyphenol and flavonoid were highest in 60 days after transplanting and was reduced according to cultivation period. The total yield of PWM was high as 3,154 kg/10a and large storage root of over 250 g accounted for 47.4% in 110 days after transplanting. Storage root (YM, JHM, HGM) of 81~150 g accounted for 34.9% ~ 43.2% in 120 days after transplanting. These are the most marketable. Because consumer in Korea prefers small, round and about 100g size sweet potato. The ratio of large storage root (over 250 g) were increased in all varieties at 130 days after transplanting. Therefore, it is considered appropriate to harvest PWM at 110 days and YM, JHM, HGM at 120 days after transplanting, which planted in late May.

• 한국환경농학회지
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• 제19권1호
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• pp.1-5
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• 2000

본 연구는 몇 가지 보리 품종들을 공시하여 염해에 대처할 재배법 개선과 내염성 품종 육성을 위한 기초적 자료로 활용하고자 분얼기와 유수형성기에 NaCl stress를 처리하고 보리의 생육특성과 품종간 염해 반응을 조사하였다. 초장, 근장, 분얼수, 잎 수 등은 NaCl 처리로 감소하였으며 그 중 분얼수가 염해를 가장 많아 받았고, 염해를 받은 후 생육이 진행됨에 따라 그 피해는 증대되었다. 그리고 분얼기에 처리한 것이 유수형성기에 처리한 것보다 NaCl stress를 더 받는 것을 보였다. 잎, 뿌리, 줄기로 구분한 생체중과 건물중 변화는 두 시기 모두 뿌리가 NaCl stress를 가장 심하게 받았다. 수량 구성요소 중 NaCl stress를 가장 많이 받는 것은 분얼기에 처리한 것이 100립중으로 무처리의 64.1% 였으며, 유수형성기에 처리한 것은 이삭 수로 무처리의 81.8% 였다. 수량구성요소로 살펴 본 NaCl sterss에 의한 품종간 차이는 분얼기에 처리한 경우 부농이 가장 약하였으며, 다음이 찰쌀보리, 동보리1호, 늘쌀보리 순이었으며, 유수형성기에 처리한 것은 늘쌀보리가 가장 약하였고 다음이 동보리1호, 부농, 찰쌀보리 순이었다.

• Asian-Australasian Journal of Animal Sciences
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• 제21권7호
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• pp.995-1002
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• 2008

Kura clover (Trifolium ambiguum M. Bieb.) is a rhizomatous perennial legume that has potential as a forage crop in the North-Central USA because of its excellent persistence under environmental extremes. Little information is available about defoliation effects on productivity of mixtures of kura clover with grasses typically grown in this region. Two field trials were conducted to evaluate the effects of defoliation management on yield and species composition of binary mixtures of 'Rhizo' kura clover with 'Comet' orchardgrass (Dactylis glomerata L.), 'Badger' smooth bromegrass (Bromus inermis Leyss.), 'Park' Kentucky bluegrass (Poa pratensis L.), and solo-seeded kura clover near Arlington, WI. Three harvest schedules (three, four, or five times annually) and two cutting heights (4 or 10 cm) were imposed. Infrequent defoliation and lower cutting height produced significantly greater total forage yield, 6.6, 5.8, and 5.2 Mg/ha in 3-, 4-, and 5-harvest systems, respectively; and 6.5 and 5.2 Mg/ha for the 4- and 10-cm cutting height, respectively. Averaged over 3 yr and two environments, mixtures had higher forage productions than solo kura clover (6.3, 5.7, and 6.0 Mg/ha for the Kentucky bluegrass, orchardgrass, and smooth bromegrass mixtures, respectively; compared to 5.2 Mg/ha for solo kura clover). The proportion of kura clover in mixtures increased from yr 1 to yr 2 and was constant from yr 2 to yr 3 (34, 58, and 57%, respectively). We conclude that kura clover has excellent potential as a long-term component of grass-legume mixtures regardless of the cutting height, harvest frequency or grass species, even though the proportion of kura clover in harvested forage was significantly greater with less frequent harvest and shorter cutting height of all mixtures.

• 한국작물학회지
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• 제35권3호
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• pp.184-194
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• 1990

본 시험은 식물생장 조절제 Hoe 78784를 처리하여 수도의 도복 방지효과를 조사하고, 식물생장 조절제의 농도와 처리 시기를 각기 달리하였을 때 수도의 영양생장, 형태적 특성 및 수량에 미치는 효과를 구명하기 위하여 실시하였던 바 몇가지 결과를 얻어 보고하는 바이다. Hoe 78784를 수도 신장기에 처리하였을 때 공시된 품종에서 도복 방지효과가 크게 나타났으며, 특히 도복성 품종인 IR21820-154-3-2-3에 있어서는 수량을 크게 증가시켰다. 생장 조절제 Hoe 78784는 초장 및 절간의 신장을 억제시켰고, 특히 형태학적 특징으로서는 Hoe 78784를 처리함으로써 셋째 및 넷째마디 간의 두께와 직경을 증가시켰으며, 또한 줄기속에 유관속의 수도 증가시켜서 도복 방지효과를 나타낸 것으로 사료되며, 영양 생장기관 및 수량구성 요소에 크게 영향을 미치지 못하였다. 처리시기와 농도별로 볼 때 Hoe 78784를 이앙후 30일날 처리하였을 때는 도복 방지효과가 뚜렷하였으며 수장 및 수량구성 요소에 영향을 미쳐 수량을 크게 감소시켰다. 그러나 출수기때 Hoe 78784 처리는 농도에 관계없이 도복 방지효과를 나타내지 않았고, 기타 제형질에도 영향을 미치지 못했다.

• 대한기계학회논문집A
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• 제34권12호
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• pp.1901-1907
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• 2010

굴삭기 유압실린더는 붐, 암, 버킷과 같은 작업장치를 작동시키는 핵심 부품이다. 일반적으로 유압실린더는 반복적인 고압으로 인해 좌굴이나 피로 파손과 같은 구조적 문제가 종종 발생한다. 따라서, 유압실린더의 내구설계 시 설계수명 동안의 피로, 항복, 좌굴 등에 대한 구조 안전도 평가가 반드시 이루어져야 한다. 내구설계는 기본설계와 상세설계 두 단계로 구성되는데, 기본설계 단계에서는 굴삭기의 작업능력, 작업속도, 작업영역 등을 고려하여 항복과 좌굴 안전도를 만족하도록 로드와 튜브의 주요 치수를 결정한다. 상세설계 단계에서는 로드 노치, 용접부, 튜브 끝단, 글랜드, 오리피스, 쿠션링 등의 상세치수를 주로 피로 안전도 측면에서 결정한다. 본 연구에서는 이러한 내구설계의 전반적인 절차와 각 설계 단계에서 내구설계 평가를 위한 해석기법에 대해 기술하였다.

• 한국수산과학회지
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• 제42권6호
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• pp.537-544
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• 2009

This study was conducted to improve yield and functional properties of autoclave-treated salmon frame extracts (SFETA) using commercial enzymes (Alcalase 2.4 L FG, Flavourzyme 500 MG, Neutrase 0.8 L and Protamex 1.5 MG). Yield and angiotensin I converting enzyme (ACE) inhibitory activity of all enzymatic hydrolysates improved compared to those of control (undigested extracts), which were the highest in hydrolysates incubated with Protamex 1.5 MG for 4 hrs (P4-treated hydrolysates) and 2 hrs (P2-treated hydrolysates), respectively. However, antioxidant activities of all enzymatic hydrolysates showed less than 29%. According to the trichloroacetic acid soluble-N, volatile component intensity and sensory evaluation, when compared to control, taste of P4-treated hydrolysates improved, while its fish odor strongly smelt. Therefore, for efficient use of P4-hydrolysates, the fish odor should be improved by Maillard reaction of extracts or pre-treatment of salmon frame.

• Advances in concrete construction
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• 제10권5호
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• pp.381-391
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• 2020

This study aimed to develop reference materials (RMs) for mortar that can simulate the initial flow characteristics with constant quality over a long period. Through the previous research on the development of RMs for cement paste, the combination of limestone, glycerol, and water was used as the basic matrix for developing RMs for mortar in this study. In addition, glass beads of three particle sizes (0.5, 1.0, and 2.0 mm) and ISO standard sand were selected as tentative candidates to derive fine aggregate substitutes. The mixture of glass beads could simulate the initial flow characteristics of mortar, but under the same mixing ratio, replicates showed an unstable tendency to indicate inconsistent values due to the generation of electrostatic properties between materials and equipment. On the other hand, the mixture using ISO standard Sand not only simulates the constant flow characteristics for a long period of time, but also shows stable results with little error in replicates. Therefore, limestone, glycerol, ISO standard sand, and water were finally determined as components that met the required properties of RMs for mortar. The effect of each component on the flow characteristics of RMs was analyzed. It was found that glycerol increased the cohesion between the particles of standard sand, resulting in a constant increase both in the plastic viscosity and yield stress. Both limestone and standard sand had a dominant effect on the yield stress. The relationships between various mortar mixing ratios and the corresponding mixing ratios of RMs were established. In addition, the results of the verification experiment showed that the rheological properties of the RMs obtained through the relationships correlated with various water/cement ratios and the fine aggregate volume fractions of mortar obtained with same manner. In other words, the RMs for mortar developed in this study can be used as standard samples because they can simulate the initial flow characteristics of mortar of various mixing ratios for a long period without any chemical changes.

• 한국수소및신에너지학회논문집
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• 제28권6호
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• pp.683-690
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• 2017

Wood pellet (WP), empty fruit bunch (EFB) and palm kernel shell (PKS) which are biomass fuels for power generation are selected to study the characteristics of torrefaction process. These biomass fuels are torrefied at $220^{\circ}C$, $250^{\circ}C$, and $280^{\circ}C$. The heating value of biomass fuels is increased depending on the torrefaction temperature. However, due to energy yield decline, it is not always desirable to torrefy biomass at higher temperature. Considering the mass yield and energy yield after torrefaction, the most proper temperature conditions for torrefaction of WP is $250-280^{\circ}C$ and for EFB, PKS are $220-250^{\circ}C$. Additionally, to investigate the phenomenons of chlorine release during torrefaction process, Ion Chromatography (IC) method was used. In the case of EFB and PKS torrefied at $300^{\circ}C$, the chlorine component has been reduced by 97.5% and 95.3% compared to the raw biomass, respectively. In conclusion, torrefied biomass can be used as alternative fuels in replacement of coals for both aspects of heating value and chlorine corrosion problems.