• Journal of Biosystems Engineering
• /
• 제27권2호
• /
• pp.125-132
• /
• 2002

In order to investigate the optimum moisture content of paddy for milling process, a series of tests were conducted by examining the recovery rate and whiteness of milled rice in relation with the various moisture content. Hwabong-byeo and Dongjin-byeo varieties which were major paddies cultivated in Korea were used for the experiment. The test was performed with small experimental milling machines. In order to minimize the unexpected factors, environment conditions were kept in constant during the experiment. As a result, the recovery rate of milled rice were varied as the changes in milling time and degree of whiteness. However, the recovery rate of milled rice increases as its moisture content increases untill a certain point of moisture content and decreases slowly afterward. This certain point can be called optimum moisture content for rice milling. Also, it has a different value depending on the variety. In this experiment, optimum moisture content of Hwabong-byeo and Dongjin-byeo were considered around 14.8% and 15.3%, respectively. It is not sure that these optimum moisture contents for the two varieties would assume the same values irrespective of harvest year and place. However, it could be concluded that the optimum moisture content for rice milling is around 15%(w.b.) for Hwabong-byeo and 15.5%(w.b.) for Dongjin-byeo, respectively.

• 자원환경지질
• /
• 제8권3호
• /
• pp.165-168
• /
• 1975

The grade and recovery rate and its sulphur content of iron concentrate compared respectively as varied with redcued size using the Crocket Magnetic Separator and the Wet-Drum-Magnetic Separator in the magnetic separation test of iron ore from Yangyang mine. The content of sulphur was decreased distinctly as the size was finer. In case of the sample of -100 mesh, using the Crocket Magnetic Separator, the sulphur content of iron ore was decreased to 0.10% and its grade increased to 67.0%, but the recovery rate was no more than 85.1%. In the Wet-Drum type, the grade and the recovery rate of concentrate was better than those in the Crocket Magnetic Separation, but the content of sulphur was more than that in the Crocket Magnetic Separation. The Crocket type is suitable for less sulphur content while the Wet-Drum Magnetic Separator is suitable for better the grade recovery rate of the magnetic concentrate.

• 생명과학회지
• /
• 제18권12호
• /
• pp.1705-1711
• /
• 2008

상추식물에서 저온 처리를 하였을 때 저온 적응성 획득 메카니즘과 관련된 APX와 DHAR의 활성도와 mRNA 발현 수준 등과의 관련성을 조사한 결과는 다음과 같다. 잎 조직내 과산화수소의 함량은 일정하게 증가하다가 $20^{\circ}C$에서 저온처리를 회복시키면 그 함량이 정상상태로 회복하는 경향을 보였으나 단백질의 함량은 반대의 경향을 나타내었다. 엽록소의 함량은 저온스트레스를 처리할 경우 엽록소 a와 b 및 총 엽록소의 함량이 점차 감소하는 경향을 보였으며 저온스트레스 회복 시 다시 증가하는 경향을 보였으나 카로티노이드 함량의 변화는 거의 일어나지 않고 일정한 수준을 유지하는 것으로 나타났다. 총 엽록소에 대한 엽록소a의 비율은 저온처리 12시간까지는 증가하다가 24시간 이후 급격하게 감소하게 되고 저온스트레스를 회복시켰을 때 정상 수준으로 회복되는 경향을 나타내었다. APX와 DHAR의 활성도는 저온 처리가 진행됨에 따라 상추의 잎 조직 내에서 급격하게 증가하는 경향을 보이고 있으나 적온으로 회복시키면 정상 수준으로 유지되었다. 저온처리 시간이 경과함에 따라 APX와 DHAR의 mRNA의 발현 수준이 크게 증가하는 경향을 보였다가 원래 수준으로 회복되었다. APX의 활성도와 과산화수소의 함량과의 상관관계는 상추의 잎 조직 내 과산화수소의 함량이 증가하면 APX의 활성도가 증가하는 경향 ($R^2$=0.8715)을 보였으며, DHAR의 활성도와 과산화수소의 함량도 동일한 경향으로 증가($R^2$=0.8643)하였다. 그러나 과산화수소의 생성량이 증가함에 따라 엽록소의 함량과 단백질의 함량은 저온 스트레스처리로 과산화수소의 생성량이 증가하면 엽록소의 함량($R^2$=0.5021)과 수용성단백질의 함량과는 감소하는 경향($R^2$=0.8915)을 보였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제7권11호
• /
• pp.2941-2956
• /
• 2013

In this paper, we propose an effective fragile image watermarking scheme for tampering detection and content recovery. Cover image is divided into a series of non-overlapping blocks and a block mapping relationship is constructed by the secret key. Several DCT coefficients with direct current and lower frequencies of the MSBs for each block are used to generate the reference bits, and different coefficients are assigned with different bit numbers for representation according to their importance. To enhance recovery performance, authentication bits are generated by the MSBs and the reference bits, respectively. After LSB substitution hiding, the embedded watermark bits in each block consist of the information of itself and its mapping blocks. On the receiver side, all blocks with tampered MSBs can be detected and recovered using the valid extracted reference bits. Experimental results demonstrate the effectiveness of the proposed scheme.

• 한국환경농학회지
• /
• 제41권3호
• /
• pp.206-216
• /
• 2022

BACKGROUND: Dithiocarbamate fungicide propineb can be analyzed quantitatively by derivatization reaction followed by HPLC/UVD, which has high reproducibility and stability. However, the presence of high protein in soybeans and peas affects the derivatization process resulting in extremely low recoveries. Therefore, this study was conducted to improve the analytical method for analysis of propineb in soybeans and peas by applying a deproteinization process using chloroform-gel method. METHODS AND RESULTS: The deproteinization process was carried out up to 6 times for soybeans and 5 times for peas using 50 mL chloroform. After 4 times of deproteinization process followed by a derivatization reaction with methyl iodide, the recovery yields of propineb in both pulses were >90%. However, the recovery yield tended to decrease when the deproteinization process was performed more than 5 times. The method limit of quantification (LOQ) was 0.04 mg/L. The recovery conducted in triplicate at 10 times and 50 times of the LOQ ranged from 87.2 to 95.0 % with a coefficient of variation <10%. CONCLUSION(S): This study confirmed that 4 times of deproteinization process using the chloroform-gel method was effective when derivatizing and analyzing dithiocarbamate fungicides in pulses with high protein content. However, depending on the initial protein content present in the pulses, there was a difference in the recovery: the lower the protein content, the higher the recovery rate of propineb. It is expected that the method proposed in this study could be applied to remove high content of protein as analytical interference substance from agricultural samples.

• 열처리공학회지
• /
• 제37권2호
• /
• pp.79-85
• /
• 2024

The effects of annealing heat treatment and the addition of Cu element on the shape memory effect of the NiTi-based alloy were investigated by analyzing differential scanning calorimeter results and characterizing recovery rate through 3D scanning after Vickers hardness test. Through 3D scanning of impressions after Vickers hardness test, the strain recovery rates for specimens without annealing treatment and annealed specimens at 400, 450, and 500℃ were measured as 45.96%, 46.76%, 52.37%, and 43.57%, respectively. This is because as the annealing temperature increases, both B19' and NiTi₂ phases, which can impede martensitic transformation, are incorporated within the NiTi matrix. Particularly, additional phase transformation from R-phase to B19' observed in specimens annealed at 400 and 450℃ significantly contributes to the improvement in strain recovery rates. Additionally, the results regarding the Cu element content indicate that when the total content of Ni and Cu is below 49.6 at.%, the precipitation of fine B19' and NiTi₂ phases within the matrix can greatly influence the transformation enthalpy and temperature range, resulting in relatively lower strain recovery rates in NiTi alloys with a small amount of Cu element produced in this study.

• 자원리싸이클링
• /
• 제12권5호
• /
• pp.36-41
• /
• 2003

슬래그는 철분함량이 높아 자원으로의 활용이 가능하나 시장상황에 따라 매립되는 등 재활용이 활발히 이루어지지 않은 실정이다. 따라서 본 연구에서는 슬래그의 재활용이 즘 더 용이하도록 슬래그 내에 존재하는 철분 회수의 중요한 방법인 자력선별 방안에 대하여 고찰하였다. 수재 슬래그, 수냉 전로 슬래그, 공냉 전로 슬래그를 시료로 사용하였고 자장의 세기, 드럼의 회전속도, 슬래그의 투입량에 따른 철분 회수량에 대하여 조사하였다. 철분함량이 적은 수재슬래그는 피더의 진동수 및 드럼의 회전수가 느릴수록 회수율이 증가하였으며 0.5mm 이상의 입도에서 자력선별시 고품위의 철분을 얻을 수 있었다. 수냉의 전로 슬래그의 경우 피더의 진동수가 빠를수록, 드럼의 회전수가 느릴수록 회수율이 증가하는 것으로 조사되었고 입도의 크기가 작아질수록 입도별 회수율이 증가하는 것으로 관찰되었다. 공냉의 전로 슬래그는 피더의 진동수가 낮은 경우 드럼의 회전수가 감소할수록, 높은 경우는 드럼의 회전수가 증가할수록 회수율이 증가하는 것으로 나타났다. 또한 자력선별시 자장의 세기를 증가시키면 회수율은 증가하나 금속철 이외의 철 화합물의 혼입이 많아져 품위가 낮아지는 것으로 관찰되었다.

• 한국식품저장유통학회지
• /
• 제23권4호
• /
• pp.530-537
• /
• 2016

본 연구에서는 보리 품종 및 도정률이 막걸리 품질특성에 미치는 영향을 살펴보기 위해 도정률(95, 85, 75%)을 달리한 새쌀보리, 새찰쌀보리, 흰찰쌀보리 원료의 특성을 살펴보고 이를 이용하여 제조한 막걸리의 품질특성을 살펴보았다. 원료곡의 품질 특성은 도정률이 감소할수록 단백질, 지방 및 회분 함량이 감소하는 경향을 나타내었으며 호화특성 또한 도정률이 감소할수록 유의적(p<0.05)으로 높은 경향을 나타내었다. 일반적으로 호화 특성 측정 결과 최고점도 및 강하점도가 높고 치반점도가 낮으면 식미가 양호하게 되는데 본 연구에서는 새쌀보리 및 흰찰쌀보리가 새찰쌀보리에 비해 식미특성이 양호할 것으로 판단된다. 보리의 품종 및 도정률에 따라 제조한 막걸리의 알코올 함량과 총산도의 유의한 차이는 없었으나, 도정률이 감소할수록 고형분 함량과 환원당함량이 유의적(p<0.05)으로 증가하였으며, 관능 특성을 살펴본 결과 보리의 품종과 도정률이 낮을수록 막걸리의 향기, 맛, 색의 점수가 증가하는 것으로 나타났다. 또한 고형분 함량, 환원당함량 그리고 관능적 특성에서 새쌀보리로 제조된 막걸리에서 다른 품종에 비해 높은 수치를 확인할 수 있었다. 따라서 본 연구결과, 도정률이 75%인 새쌀보리로 막걸리를 제조하였을 때 우수한 품질특성을 갖는 막걸리를 기대할 수 있을 것으로 판단된다.

• Journal of Nutrition and Health
• /
• 제14권4호
• /
• pp.151-161
• /
• 1981

The objective of this study was to compare the electrolytes contents in skeletal muscles of two different groups of rats, one for control fed 20% casein diet, and the other experimental group recovered from 7% casein diet as protein restriction feeding for two weeks at the beginning of this experiment. Two different comparison criteria were used in this study, one for comparison between animals at the same age groups and the other between groups weighing same body weight as the control groups. Food consumption of animals for experimental and control groups were ad libitum. Following measurement and samples were collected: body weight, five different muscles-anterior tibialis (A.T.) extensor digitorium longus (E.D.L.) soleus, plantaris, gastrocnemius-for electrolytes and protein analysis. The experimental groups showed lower body weight than that of control group. Same trend was showen in protein content in five different muscles. Magnesium and potassium content in four muscles except gastrocnemius showed lower and sodium higher in experimental groups than those in control group at fourteenth day, after recovery from protein restriction, electrolytes content change showed differently in four muscles. Magnesium and potassium contents were increased as protein content in diet. Sodium content decreased as one week intake of recovery diet started, thereafter it was rather slowly increased. Phosphorus content in gastrocnemius at the second week in experimental group was slightly lower than that of control group, and it recovered rapider while at the same body weight group it was higher in experimental group.

• 한국멀티미디어학회논문지
• /
• 제18권1호
• /
• pp.88-96
• /
• 2015

The recent increase in the production of 3D contents allowed viewers to experience various 3D contents. However, some of the viewers did not experience 3D depth well. Several researches were done in past to measure viewers' 3D depth perception, but these researches were done with certain limitations. In this paper, we measured viewers' 3D depth perception and recovery rate in relation with the changes in binocular disparities, saturation, and brightness values after subjects' watching 2D/3D contents. The results showed that when viewers watched the 3D content with positive binocular disparities for 42 minutes, viewers felt that the object seemed to have moved further forward than it was before; with 3D content with negative binocular disparities, viewers felt that the object seemed to be moved backwards. We found that the locational differences of the object in positive disparities were greater than those in the negative binocular disparities. The recovery rate was computed by comparing two measured values of before and after watching 3D contents for 30 minutes. On average, after 30-minute break, viewers showed roughly 50 % of recovery rate.