• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.788-789
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• 2011

A comprehensive thermo-electromagnetic model has been developed to estimate temperature and electromagnetic distribution in an three-phase induction motor under steady state operation. Electromagnetic modeling enables us to predict thermal dissipation rates by eddy-current loss and copper loss in induction motors. Non-uniform temperature distributions are investigated to account for the strong effect of local temperature build-up on the motor performance and expected life-span. For more accurate thermal modeling purpose, Heat loss mapping method, which is matched up with electromagnetic losses and volumetric heat source, is developed and performed analysis. Heat loss mapping method can be greatly used as a design or diagnostic tool for three-phase induction motors with complex structural electromagnetic fields.

• Journal of Animal Science and Technology
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• 제51권4호
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• pp.329-336
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• 2009

본 실험은 돈육의 육색과 보수력과의 상관관계를 알아보고자 동일한 품종(Landrace $\times$ Jeju native black pig, $F_2$), 동일한 사양방법, 동일한 도축방법으로 생산된 419두의 등심을 시료로 이용하여 사후 24시간에 육색, 보수력, 일반성분 및 pH를 측정하여 분석하였다. 그 결과, 각 측정치들은 큰 변이를 보여 시험군의 돈육질의 변이가 큰 것으로 나타났다. 육색측정치 중 명도가 육즙손실과 가장 높은 상관관계를 보였으며 hue(h) 값과 황색도도 육즙손실과정의 상관관계가 인정되었다. 하지만 적색도와 Chroma는 육즙손실과 상관관계가 없는 것으로 나타나, 육즙손실을 추정하는데 CIE $L^*$, $a^*$, $b^*$ 체계보다 CIE $L^*$, $b^*$, h 체계가 더 적합할 것으로 사료된다. 명도 단독으로 육즙손실을 추정하면 정확도가 27% 밖에 되지 않아 보다 정확도를 높이기 위해서는 hue 값과 황색도를 포함한 다중회귀 방정식을 이용하는 것이 좋을 것으로 사료되었다. 또한 pH도 명도와 육즙손실과 유의적으로 높은 부의 상관관계를 나타내었으나, pH 단독으로 명도와 육즙손실을 추정하면 정확도가 각각 44% 및 17%에 불과하였다. 따라서 pH 단독으로 육색과 보수력을 동시에 고려하는 돈육질을 판단하는 것은 부적절하다고 사료되었다. 본 연구결과를 종합하면, 동일한 품종, 사양방법, 도축방법으로 생산된 돈육이라도 육색과 보수력의 큰 변이로 돈육질의 변이도 크게 나타나며, 비록 명도, 육즙손실 및 pH가 상호 높은 상관관계가 있다고 하더라도 단독으로 돈육질의 추정에 이용되는 것은 부적절하다고 사료된다.

• 생물환경조절학회지
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• 제22권1호
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• pp.73-79
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• 2013

본 연구에서는 온실의 열손실을 최소화할 방안을 모색하기 위하여 경남지역에 있는 시설 농가를 대상으로 열화상 카메라를 이용하여 열손실 사례에 대한 실태조사를 실시하였다. 그 결과를 요약하면 다음과 같다. 치마처리 전 후의 두 실험구간의 온도차는 각각 $2.0{\sim}3.0^{\circ}C$ 및 $1.0{\sim}2.0^{\circ}C$ 정도인 것을 알 수 있다. 열화상 기기에 의해 계측된 온도와 온도 센서에 의해 계측된 온도와는 상관 관계가 큰 것으로 나타났다. 실태조사 지역 간에 큰 차이는 없었지만 보온용 부직포가 1층인 경우와 2층인 경우를 보면, 1층이 2층에 비해 상대적으로 열손실 크게 나타났다. 그리고 전체적으로 온실의 형태와 무관하게 측장부분과 수평보온커튼의 틈새, 측면과 전 후면 보온용 부직포의 이음부분이 완전히 밀폐되지 않아 열손실이 상대적으로 큰 것으로 나타났다. 특히, 파손된 피복재나 출입문, 환기구, 박공, 바닥부근 등에서 틈새가 생겨서 많은 양의 열이 손실되고 있었다.

• 농업생명과학연구
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• 제46권1호
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• pp.153-161
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• 2012

Wheat is a very popular crop in all over the world due to the various use of wheat flour as staple foods, such as bread. As many food products are made from wheat, the property of wheat can be a determinant of the quality of final food products. Staled bread is not harmful to health but is normally rejected by consumers due to the absence of desirable sensory attributes. The phenomena of staling can be increased hardness of bread, the migration of moisture from center of bread to the crust of bread, loss of flavor and etc. The exact mechanism of staling has not been established completely. To delay or prevent staling, either addition of anti-staling agent, such as surfactant and enzyme or modification of wheat component, such as wheat starch has been adapted. The development of waxy wheat made it possible to reconstitute the starch component in bread. When the content of amylopect in was increased in bread, the loss of moisture was decreased and the reduction in softness of bread was decreased during storage. Increased retrogradation of starch did not always accompany the staling of bread indicating that the retrogradation of starch may not be a single indicator of bread staling. To find out the exact relationship between bread staling and starch retrogradation, further research is necessary.

• 농업과학연구
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• 제41권4호
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• pp.265-274
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• 2014

Physiological characteristics of two Korean golden kiwifruit cultivars, 'Halla Gold' and 'Haehyang', were compared to determine the storage potential of fruit. The soluble solid levels of the fruit were 8.9 and 6.9 oBrix in 'Halla Gold' and 'Haehyang' at harvest, respectively but increased up to 15.4 in 'Halla Gold' and 17.5 oBrix in 'Haehyang' after 2 months of storage. Major sugars were fructose and glucose, and sucrose content was relatively low regardless of cultivar. The edible quality of 'Haehyang' was better than 'Halla Gold' because of higher amount of sugars. Firmness of the fruits gradually decreased as the increase of storage period in 'Halla Gold' in both flesh and core tissue. Th firmness loss of 'Haehyang' fruit was faster in the first 2 months and then became slow. After 75 days of storage, the firmness of 'Haehyang' fruit was only 5.2% at harvest. Core tissue was soften enough to eat at ripe stage. Wall modifying enzyme activities including xylanase, ${\alpha}$-L-arabinofuranosi-dase and ${\beta}$-galactosidase were consistently higher in 'Haehyang' and the activity of pectate lyase was more increased than 'Halla Gold' after 2 months of storage. Respiration rate of 'Haehyang' was higher than 'Halla Gold' and further increased after 2 months of storage. Weight loss was much higher in 'Haehyang' which showed higher rate of the firmness loss. The storage potential of golden kiwifruit was estimated to be about 2 months for 'Haehyang' and 3 months for 'Halla Gold' when determined on the basis of the fruit firmness.

• 한국식품위생안전성학회지
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• 제14권2호
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• pp.160-166
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• 1999

Microbial populations of total aerobic bacteria and coliforming bacteria, TBA, Hunter's color value, heme pigments, muscle protein solubility, cooking loss and shear force were investigated fro evaluating the shelf life of chicken legs gamma-irradiated at doses of 1, 3, 5 and 10 kGy with air-contained and vacuum-packaged methods. The initial microbial populations decreased with gamma irradiation depending upon the dose, and microorganisms in the vacuum-packaged samples were inhibited more than those in the air-contained samples. Hunter's L and a values of the surface and inside of the legs increased by gamma irradiation, showing a bright red color and the red color was maintained during the storage of both samples. The concentrations of oxymyoglobin among the heme pigments increased by gamma irradiation. Muscle protein solubility slightly increased by increasing the applied dose. There were no significant differences in the cooking loss and shear force values. In conclusion, the combination of gamma irradiation and vacuum-packaging could extend the shelf life of chilled chicken without deterioration of the quality.

• 한국축산식품학회지
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• 제38권3호
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• pp.580-592
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• 2018

The formulation of an oil/water (o/w) emulsion made up of a mixture of perilla oil and canola oil (30/70 w/w) was optimized using a response surface methodology to find a replacement for animal fat in an emulsion-type meat product. A 12 run Plackett-Burman design (PBD) was applied to screen the effect of potential ingredients in the (o/w) emulsion, including polyglycerol polyricinoleate (PGPR), fish gelatin, soy protein isolate (SPI), sodium caseinate, carrageenan (CR), inulin (IN) and sodium tripolyphosphate. The PBD showed that SPI, CR and IN showed promise but required further optimization, and other ingredients did not affect the technological properties of the (o/w) emulsion. The PBD also showed that PGPR played a critical role in inhibiting an emulsion break. The level of PGPR was then fixed at 3.2% (w/w total emulsion) for an optimization study. A central composite design (CCD) was applied to optimize the addition levels of SPI, CR or IN in an (o/w) emulsion and to observe their effects on emulsion stability, cooking loss and the textural properties of a cooked meat emulsion. Significant interactions between SPI and CR increased the cooking loss in the meat emulsion. In contrast, IN showed interactions with SPI leading to a reduction in cooking loss. Thus, CR was also removed from the formulation. After optimization, the level of SPI (4.48% w/w) and IN (14% w/w) was validated, leading to a perilla-canola oil (o/w) emulsion with the ability to replace animal fat in an emulsion-type meat products.

• Asian Pacific Journal of Cancer Prevention
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• 제17권12호
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• pp.5121-5126
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• 2016

Objective: To investigate the impact of chemotherapy on quality of life (QoL) among breast cancer patients and to evaluate the relationship with age, cancer stage and presence of any comorbidity. Methods: A prospective study was conducted among breast cancer patients receiving chemotherapy in Hospital Melaka from 1st January 2014 to 31st July 2014. The European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) was given to patients to fill in prior chemotherapy (baseline) and after the third cycle of chemotherapy. Socio-demographic and clinical data were collected and analyzed using SPSS version 20. Result: Respondents were 32 female patients [mean age (SD): 49.7(9.93) years]. They reported a significant lower global health status (P < 0.01) and significant higher symptoms of nausea and vomiting (P < 0.01), loss of appetite (P = 0.028) and diarrhea (P = 0.026) after the third cycle of chemotherapy as compared to baseline. Compare to, this study showed significant better emotional functioning (P < 0.01) and social functioning (P < 0.01) than the EORTC QLQ-C30 Reference Values 2008 for breast cancer cases. Under symptom scales higher scores were noted for appetite loss (P = 0.017), nausea and vomiting (P < 0.01). Age, stage and comorbidity had no clear associations with global health status in our patients (P > 0.05). Conclusion: Chemotherapy did reduce the QoL of breast cancer patients. Management of chemotherapy-induced loss of appetite, diarrhea, nausea and vomiting should be improved for a better outcome.

• Rapid Communication in Photoscience
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• 제3권2호
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• pp.28-31
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• 2014

Loss of chlorophyll is the visible symptom of leaf senescence and staygreen refers to the delayed leaf senescence in plants. The staygreen gene (SGR) in rice (Oryza sativa L.) has been identified as its mutation maintains greenness during leaf senescence, and encodes a chloroplast protein required for the initiation of chlorophyll breakdown in plants. In this study, we isolated a rice SGR-homologous gene in creeping bentgrass (Agrostis stolonifera L.), and transgenic creeping bentgrass plants were obtained by introducing pCAMBIA3301 vector harboring antisense SGR gene under control of the senescence-specific SAG12 promoter. Transgenic plants were selected by herbicide resistance assays and genomic integration of the transgenes was confirmed by PCR analysis. Subsequent analyses demonstrated the staygreen phenotype of the transgenic creeping bentgrass plants with decreased chlorophyll loss during leaf senescence. These results suggest that the antisense SGR expression in creeping bentgrass delays leaf senescence, which provides a way to develop genetically engineered turfgrass varieties with the commercially useful staygreen trait.

• Corrosion Science and Technology
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• 제12권5호
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• pp.209-214
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• 2013

In the industry, accelerated corrosion test is used for the life time prediction. When anti-corrosion test proceeds in real environments, it is difficult that we predict and evaluate the corrosion life time because of the long test time such as 10 years or more time. Accelerated corrosion test and Salt spray test are able to test corrosion life time of products in the laboratory instead of outdoor corrosion test. Experimental procedure is selected for the corrosion standard specimen, exposure of the specimens, measurements of the mass loss and evaluating the mass loss data. As a result, the acceleration factor of the accelerated corrosion test to the outdoor corrosion test is 414.8. Therefore we can predict the corrosion life time of carbon steel during a short time period.