• 한국토양비료학회지
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• 제50권5호
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• pp.452-461
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• 2017

This study was conducted to select an optimal approach to corn waste biochar (BC) application, and to evaluate the effects of combined application of BC and inorganic fertilizer (IF) on corn growth and soil chemical properties in a pot experiment. Corn growth differed with BC application timing and BC application levels. Based on the characteristics of corn growth in pot-based experiments, the selected optimal application conditions of BC were application of $500kg\;10a^{-1}$ at 20 days before sowing. Also, the chemical properties of the tested soil with BC after corn harvesting were significantly improved than those in the other treatments. In particular, soil pH and CEC regardless of application conditions were markedly increased by 0.04~0.19 units and $0.08{\sim}2.58coml_c\;kg^{-1}$ in BC treatments than without BC treatments. Additionally, combined application of BC and IF had greater effects on corn growth than single application of BC. Therefore, the results suggest using properly BC application conditions and a combination of BC and IF for effective corn cultivation in an upland field.

• 한국식품과학회지
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• 제27권3호
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• pp.428-438
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• 1995

Corn starch와 waxy corn starch를 사용하여 중간수분계의 수분함량으로 반죽을 제조하고 수분함량과 가열온도, 가열시간에 따른 전분 반죽의 호화양상을 밝혀 보고자 하였다. Corn starch와 waxy corn starch의 amylograph 호화 특성은 1% CMC를 첨가하여 측정한 호화개시 온도가 모두 약 $64^{\circ}C$로 나타났다. DSC특성은 corn starch호화 개시 온도가 $68.15^{\circ}C$, 최대호화온도가 $74.01^{\circ}C$, 호화종결 온도가 $85.65^{\circ}C$, 호화엔탈피는 3.2 cal/gram이었으며, waxy corn starch의 호화개시온도는 $68.24^{\circ}C$, 최대호화온도 $75.43^{\circ}C$, 호화종결온도 $93^{\circ}C$, 호화엔탈피는 4.2 cal/gram으로 나타났다. 수분함량$(X_1)\;36{\sim}52%)$, 가열온도$(X_2)\;60{\sim}100^{\circ}C$, 가열시간$(X_3)$ $0{\sim}2.0$분으로 가열시 corn starch와 waxy corn starch 반죽의 호화도(Y) 변화를 실험계획법으로 조사한 반응표면 회귀 방정식은 corn starch 반죽의 경우 $Y=28.659＋8.638\;X_1+15.675\;X_2+7.770\;X_3-1.620\;{X_1}^2+10.790\;X_1X_2-4.220\;{X_2}^2+0.510\;X_1X_3+1.980\;X_2X_3-6.850\;{X_3}^2$ $(R^2=0.9714)$ 이었고 waxy corn starch 반죽의 경우는 $Y=32.617+12.535\;X_1+20.470\;X_2+8.608\;X_3+4.093\;{X_1}^2+13.550\;X_1X_2-4.467\;{X_2}^2+1.560\;X_1X_3+2.160\;X_2X_3-9.527\;{X_3}^2$ $(R^2=0.9621)$이었다. 즉 수분함량과 가열온도, 가열시간이 증가할수록 반죽의 호화도는 모두 증가하는 경향을 나타내었고 같은 조건에서는 waxy corn starch가 corn starch 반죽보다 $10{\sim}20%$ 정도 더 호화되는 것을 알 수 있었다. Corn starch 와 waxy corn starch 반죽의 호화 속도를 보면 가열온도 $70^{\circ}C$와 $80^{\circ}C$에서는 가열시간 0.5분 이내에서 비교적 빠른 속도로 반죽이 호화되고 가열시간이 그 이상으로 증가할 때도 반죽의 호화가 약간은 진행되지만 $90^{\circ}C$ 이상의 가열온도에서는 가열시간 0.5분 이내에 반죽의 호화가 급속히 일어나고 가열 시간을 증가시켜도 더이상의 호화는 일어나지 않았다. 같은 조건에서는 waxy corn starch 반죽의 호화 속도가 corn starch보다 더 빠른 것으로 나타났다. 대표적으로 52% 수분함량에서 반응속도상수(k)와 가열온도(T)사이의 관계식은 corn starch의 경우 $logk=11.1140-4.1226{\times}10^3(1/T)$, waxy corn starch의 경우 $logk=10.1195-3.7090{\times}10^3(1/T)$이었다.

• Journal of Biosystems Engineering
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• 제26권2호
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• pp.131-140
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• 2001

This study was conducted to develop a garlic separator which could to reduce the labor in preparation of seeding. After consideration of the design criteria of a garlic separator such as no additional conveying device, simple construction and operation, enhancement of separating efficiency, reduction of damage, degree a rotating corn type garlic separator was designed. The effects of design parameters such as height and angle of the inner and outer corns, rotating speed of inner corn on the separating performance of the prototype were estimated. In performance was compared with manual work. The results are summarized as follows. 1. Garlic bulbs were separated by a spiral movement in the gap between inner rotating corn and outer fixed corn. At constant feed rate of garlic bulbs, the capacity of garlic separation increased with increase of rotating speed of inner corn. Especially, the capacity was very high at the rotating speeds of 300 and 400rpm. 2. The damage degree of separated garlics increased with rotating speed of corn within 10%. Above 300rpm, separability of Uisung garlic was about 100% and incomplete separation of Namdo garlic was within 2%. 3. The capacity of prototype garlic separator developed in this study was 30 times as large as that of human being.

• 자원ㆍ환경경제연구
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• 제27권3호
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• pp.521-544
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• 2018

This paper investigates the impact of ethanol mandate on the price relationship between corn and beef using the monthly time-series data from January 2003 through December 2013. In addition, we examine the non-linearity in ethanol, corn, and beef markets. Based on the threshold cointegration test, we find the symmetric relationship in pairs with ethanol production-corn price and ethanol production-beef price whereas there is the asymmetric relationship between prices of corn and beef. Employing the threshold vector error correction and vector error correction models, we also find that the corn price in the U.S is caused by both ethanol production and beef price in a long-run when the beef price is relatively high. On the other hand, the corn price does not cause both ethanol production and beef price in the long run. Findings from this study imply that demanders for corn such as ethanol and beef producers have price leadership on corn producers.

• 한국작물학회지
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• 제44권3호
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• pp.197-200
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• 1999

In order to get abundant germplasm for develop- ing new corn varieties, major morphological characteristics of ear were evaluated with a total of 210 Korean indigenous maize lines collected from various parts of Pusan City and Kyungnam Province, Korea. The ear shape of Korean indigenous maize was mainly cone type or similar to cone type. Cylinder type or similar to cylinder type of corn was collected from the north-west mountainous. region of Kyungnam Province, whereas cone type or similar to cone type was collected from the plain region. In the kernel colors of each ear, ears with mono colored kernels were 55.7% of the total, and ears with two to four mixed colors were 44.3%. Among the mono colored ears, brown was the most abundant at 16.8%. There was an average of 12∼14 rows per ear. Kernal rows per ear varied from 8∼20. Waxy corn was predominant at 67.2%, mixed corn with waxy kernel and common kernel at 11.0%, and common corn at 21.8%.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2000년도 제17차 정기총회 및 학술발표
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• pp.108-110
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• 2000

A 12-w feeding trial was conducted with 600 38-wk-old layers to evaluate the nutritive value of high oil corn(HOC) in layer diets. For the control, a commercial corn-soybean meal basal diet was used. An iso-calorie diet(HOC-ISO) was prepared replacing corn with HOC in the control diet. In addition a third diet was prepared by simply replacing corn with HOC on 1:1 basis to give a high energy diet(HOC-1:1). There were 5 replicates per treatment, and 40 birds per replicate. Birds were housed in an open-sided layer house equipped with wire cages. Feed and water were provided ad libitum, and 17L:7D lighting program was adopted. No significant difference (P>0.05) was found among dietary treatments in laying performance. Also physical qualities of eggs were not significantly affected by the feeding of HOC. Although not significant, HOC-ISO tended to improve the laying rate during the summer. The HOC feeding significantly increased the polyunsaturated fatty acids contents in egg yolk, especially the linoleic acid The AME contents of Chinese yellow corn, U.S. corn, and HOC were 3177, 3158 and 3387 kcal/kg respectively.

• Archives of Plastic Surgery
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• 제32권5호
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• pp.656-659
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• 2005

Plantar corn is a circumscribed and sharply demarcated hard mass of traumatic hyperkeratosis, which has a central core impacting the dermis deeply and causes pain while walking. The cause of the corn is the mechanical stress to the skin induced by several causative factors; extrinsic(tight shoes) or intrinsic(bony prominence), or combined(the claw toe). We found 7 cases of patients with a painful recurrent plantar corn which had an epidermal cyst under its lesion. These corns and cysts were excised totally and there was no recurrence in all cases during two to four months follow-up period. We think that an epidermal cyst may be another intrinsic factor for the development of a plantar corn. So, an epidermal cyst should be considered once in a recurrent plantar corn to be recalcitrant against popular treatments.

• 한국식품영양과학회지
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• 제42권8호
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• pp.1290-1295
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• 2013

옥수수 섬유질을 이용한 고식이섬유 식빵을 제조하기 위하여 옥수수 섬유질을 수분함량 30, 40%, 배럴온도 $140^{\circ}C$, 스크루 회전속도 200 rpm으로 압출성형 처리한 후 첨가율에 따른 제빵특성을 검토하였다. 식빵의 부피는 옥수수 섬유질의 첨가비율이 증가함에 따라 감소하는 경향을 보였다. 압출성형 옥수수 섬유질 5% 첨가군에서는 수분함량 30, 40% 압출성형 옥수수 섬유질 첨가 식빵의 비체적이 각각 5.688, 5.712로 대조군 5.222(L/kg)보다 더 높게 측정되었다. 저장 기간 동안 옥수수 섬유질 첨가 식빵의 경도는 대조군과 압출성형 옥수수 섬유질첨가 식빵보다 높은 경도 값을 나타내었다. 그러나 옥수수 섬유질과 압출성형 옥수수 섬유질 5% 첨가 시 저장기간에 따라 대조군보다 낮은 결과를 보여 주었다. 관능검사 결과는 대체적으로 첨가비율이 증가할수록 선호도가 떨어졌다. 이는 첨가물의 비율이 높을수록 품질특성이 낮아지는 결과와 일치한다. 옥수수 섬유질을 압출성형하여 첨가하였을 때 전반적인 기호도는 상승하였다. 압출성형공정을 통해 옥수수 섬유질에 포함된 전분이 호화되고 섬유질의 구조가 파괴되어 비전분성 다당류인 cellulose와 hemicellulose가 식빵 품질에 영향을 주는 것으로 판단된다.

• 한국식품영양과학회지
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• 제13권2호
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• pp.156-162
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• 1984

casein, soy protein, corn gluten의 세가지 단백질 식이를 임신기 및 수유기 동안 어미쥐에게 섭취시킨후 출생시부터 생후 21 일까지의 새끼쥐의 세포 발달을 관찰한 결과는 다음과 같다. 1) 새끼쥐의 출생시 체중은 corn gluten군이 case군에 비하여 매우 유의적으로 낮았고 수유기 중에도 그 경향은 계속되었다. 2) 출생시 새끼쥐의 기관별 무게는, 뇌와 콩팥은 실험군간 유의적 차이가 없었으며 간의 무게는 corn gluten군이 casein군에 비하여 유의적으로 적었다, 그러나 출생 3일이후 뇌, 간, 콩팥의 무게는 생후 21일까지 corn gluten 군이 casein에 비하여 유의적으로 적었으므로 아미노산 조성의 블균형이 기관의 무게를 감소시킴을 나타내었다. 3) 세포의 수를 짐작할 수 있는 DNA함량은 세 기관에서 일반적으로 casein군, soy protein군, corn gluten군의 순서였으나 뇌의 경우는 출생 14일에 , 간의 경우는 14일과 21일에 casein군에 비하여 corn gluten 군이 유의적으로 적었다. 그러므로 아미노산 조성의 불균형에 따른 영향은 세포 발달과정에서 세포수에 큰 영향은 아니지만 간 세포수를 감소 시킴을 알 수 있었다. 4) 총 단백질과 RNA 함량은 뇌의 경우 생후 3일 이후 corn gluten군이 casein군에 비하여 유의적으로 적었으며 100 mg 젖은 무게당 함량은 유의적 차이는 없었다. 간에서는 총 RNA 함량은 corn gluten 군이 출생시부터 유의적으로 적었고 총단백질 함량은 출생 3일이후 매우 유의적으로 적었다. 그러나 100 mg 젖은 무게당 두 지표의 함량은 21일에 RNA 함량이 유의적으로 적었을 뿐 실험군 간 차이가 없었다. 그러므로 기관별 세포의 크기는 세 실험식이간에 차이가 없었다.

• 한국초지조사료학회지
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• 제20권1호
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• pp.31-40
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• 2000

This study was conducted to investigate the effects of application levels of swine manure fermented with sawdust(SMFS) and degree of the slope on productivity of corn, and nitrogen and organic matter runoff in corn cultivation soil. Main plots were consisted of the degree of slope, such as 0, 5 and 10, and the subplots consisted of application levels of SMFS, such as control, 200kgNha and 400kgNha. Lysimeter was constructed with 0.33m width, 3m length and 0.4m height. Dry matter(DM) yields of corn decreased as the slope increased but there was no significant differences between the degree of the slope. DM yields increased significantly as application levels of SMFS increased (pc0.05). DM yields decreased according to continuous cultivation of corn. Total nitrogen(TN) contents of the whole corn decreased as the slope increased(p<0.05). TN content in SMFS treatments was higher than that of non-SMFS treatment but there was no significantly different between SMFS treatments. TN yields decreased significantly as the slope and the application level of SMFS increased(p<0.05). Nitrogen and organic matter yields in the runoff waters increased as the slope and application levels of SMFS increased. The runoff of nitrogen and organic matter was more affected by the increase of the slope than application levels of SMFS. (Key words : Corn, Runoff, Swine manure, Degree of slope, Lysimeter)