• Journal of Biosystems Engineering
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• 제30권6호통권113호
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• pp.340-346
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• 2005

Major quality features of the beef carcass in most countries including Korea are size, marbling state of the lean tissue, color of the fat and lean tissue, and thickness of back fat of the 13th rib. To evaluate the beef quality, extracting loin parts from the sectional image of the 13th beef rib is crucial and is the first step. However, because of the inhomogeneous distribution and fuzzy pattern of the fat and lean tissues on the beef cut, it is difficult to extract automatically the proper contour of the lean tissue. In this paper, a prototype mobile beef quality measurement system, which can be implemented practically at the beef processing site was developed. The developed system was composed of the hand held image acquisition unit and mobile processing unit mounted with touch-pad screen. Algorithms to extract the boundary of the lean tissue and a proper tool to evaluate the marbling status have been developed using color image processing. The boundary extraction algorithm showed successful results for the beef cuts with simple and moderate patterns of the lean tissue and fat. However, it had some difficulty in eliminating complex pattern of the extraneous tissues adhered to the lean tissue in the boundary extraction. The developed algorithms were implemented to the prototype mobile processing unit.

• Asian-Australasian Journal of Animal Sciences
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• 제12권3호
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• pp.388-394
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• 1999

Two experiments were conducted to subdivide isoleucine (exp. 1) and valine (exp. 2) requirements for maintenance from the requirements for growth of broilers aged 1 to 3 weeks. Purified diets were used, containing five graded levels of isoleucine and valine. Based on weight gain response, the isoleucine requirement for growth was 7.50 mg/g weight gain and the daily isoleucine need for maintenance (mg) was 0.044 per unit metabolic body size ($(Wg^{0.75})$). Based on the N gain response, the isoleucine requirement for growth was 0.317 mg/mg N gain and the daily isoleucine need for maintenance (mg) was 0.040 per unit metabolic body size $(Wg^{0.75})$. Based on weight gain and N gain response, the total isoleucine requirement was calculated 244 mg/day or 0.59% of the diet, 274 mg/day or 0.66% of the diet, respectively. From the relationship of weight gain and N gain, 5.07% of the retained protein was comprised of isoleucine; the reported isoleucine content of chick muscle was 4.42%. The valine requirement for growth was 9.84 mg/g weight gain and 0.36 mg/mg N gain whereas the maintenance requirement was 0.046 or 0.052 mg per unit of metabolic body size (Wgo.11. According to the model developed to estimate valine requirement, the total requirement was 319 mg/day or 0.77% of the diet, 315 mg/day or 0.76% of the diet, respectively. Previous reported valine requirements for growing chicks of 7~24 days old were in close agreement with these estimates. As a percentage of retained protein, valine was calculated to be 5.81% ; the reported valine concentration of crude protein of chicks' body including feathers was 6.72%.

• 한국경영과학회지
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• 제19권1호
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• pp.145-152
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• 1994

This paper deals with an economic design of acelerated life test under constant stresses where failure times are exponentially distributed. In this case the optimization criterion is the information amount per unit cost. Fisher's information matrix of exponential distribution's parameters and expected cost considering fixed and variable costs are obtained. The decision variable is the censoring time in the model. In the 2-level constant stress case, it is proved that the optimal solution exists and is unique under some condition. Numerical examples are also included.

• 미생물학회지
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• 제39권4호
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• pp.223-229
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• 2003

2,4,6-Trinitrotoluene (TNT)을 분해할 수 있는 Stenotrophomonas sp. OK-5에서 분리한 NAD(P)H-nitroreductase의 특성을 조사하였다. 먼저 ammonium sulfate precipitation, DEAE-sepharose, 그리고 Q-sepharose 등의 일련의 정제 과정을 통하여 NAD(P)H-nitroreductase을 분리정제하였다. 분취기로부터 얻어진 시료로부터 NAD(P)H-nitroreductase의 효소활성을 가지는 3개의 다른 fractions (I, II 및 III)이 탐침되었다. NAD(P)H-nitroreductase의 fractions I, II, 그리고 III의 비활성(specific activity)은 각각 5.06 unit/mg, 4.95 unit/mg, and 4.86 unit/mg이었으며, crude extract와 비교하여 각각 10.5배, 9.8배, 8.9배 이상 농축되었다. 이 실험에서 이들 3개의 fractions 가운데, fraction I이 가장 높은 비활성을 나타내었다. NAD(P)H-nitroreductase (fractions I, II 및 III)의 효소활성에 영향을 미치는 몇 가지 요인을 조사하였다. 모든 NAD(P)H-nitroreductase (fractions I, II 및 III)의 최적 온도는 30$^{\circ}C$이었으며, 최적 pH는 약 7.5이었다. 4Ag^+, Cu_2^+, Hg_2^+$ 등의 금속이온은 약 80%의 효소활성을 저해하였으나, $Mn_2^+ 이나 Ca_2^+$의 첨가 시에는 약 30~40% 정도의 활성이 감소되었다. 그러나 $Fe_3^+$은 이들 효소의 활성을 증진시켰다. SDS-PAGE에 의해 측정된 NAD(P)H-nitroreductase의 fractions I, II 및 III의 분자량은 모두 약 27 kDa임이 확인되었다.

• 한국생명과학회:학술대회논문집
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• 한국생명과학회 2002년도 제35회 학술심포지움 및 춘계학술대회
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• pp.98-98
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• 2002

• 생명과학회지
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• 제22권6호
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• pp.837-843
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• 2012

본 연구는 새롭게 개발된 느티만가닥버섯의 6개 품종에 대한 형태적, 생리적 특성을 조사하고 endo-, exo-cellular 효소 활성을 측정하기 위해서 수행되었다. 국내 야생종인 Hm3-10과 일본 재배종인 Hm1-1과의 단핵균사 교배를 통하여 343개의 교배 균주를 획득하여 재배를 실시하여 58개 균주를 1차 선발하고 2차로 6개 균주를 선발하였다. 6개 선발 균주를 대상으로 배양 일수 별로 재배를 실시한 결과 배양일수가 80일 이상에서는 재배일수가 19~20일로 단축되어 최적 배양일수를 80일로 결정하였다. 80일 배양일수에서 각 품종별 형태적 특성을 검증한 결과 Hm15-3, Hm15-4, Hm17-5의 3균주가 재배에 적합한 균주로 판명되었다. 각 균주의 endo-cellular 효소 활성도를 측정한 결과, ${\alpha}$-amylase의 효소 활성도가 73.9~102,2 unit/mg protein으로 가장 높았으며, chitinase 의 효소 활성도가 8.1~13.1 unit/mg protein으로 측정되었다. Exo-cellular효소 활성도를 측정한 결과, ${\alpha}$-amylase의 효소 활성도가 5,292~1,184 unit/mg protein으로 가장 높았으며, CMCase와 Xylanase의 효소 활성도가 각각 1,140~245 unit/mg protein, 94~575 unit/mg protein으로 측정되었다. 그러나 ${\beta}$-glucosidase와 chitinase의 활성도는 비교적 낮은 활성도를 나타내었다.

• Asian-Australasian Journal of Animal Sciences
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• 제10권1호
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• pp.122-133
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• 1997

Purified diets containing 5 graded levels of threonine were fed to young, growing and finishing pigs to determine the threonine requirement for growth and maintenance. A model was developed to subdivide the threonine requirement for the maintenance from the requirement for growth. From this model, the threonine requirement for growth was 7.733, 10.968 and 11.235 g/kg live weight gain and the maintenance requirement was 0.118, 0.048 and 0.024 g per unit of metabolic body size at each stage of growth, respectively. In the young pigs, the threonine requirement for growth was 0.388 g/g N gain and the maintenance requirement was 0.122 g per unit of metabolic body size. The breakpoint of plasma threonine concentrations was 3.995, 7.933 and 7.738 g/d, respectively. Expected requirements obtained from these formulae were in general agreement with previous estimates. Based on the weight gain vs N gain equation, about 4.24% of the retained protein was comprised of threonine and compared to 3.81%, the mean threonine content of pig muscle CP.

• Asian-Australasian Journal of Animal Sciences
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• 제10권1호
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• pp.86-97
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• 1997

Purified diets containing 5 graded levels of methionine + cystine were fed to young, growing and finishing pigs to determine the methionine + cystine requirement for growth and maintenance. A model was developed to subdivide the methionine + cystine requirement for maintenance from requirement for growth. From this model, the methionine + cystine requirement for growth was 8.633, 10.260 and 9.293 g/kg live weight gain and the maintenance requirement was 0.049, 0.016 and 0.019 g per unit of metabolic body size at each stage of growth, respectively. In the young pigs, the methionine + cystine requirement for growth was 0.491 g/g N gain and the maintenance requirement was 0.059 g per unit of metabolic body size. The breakpoint of plasma methionine + cystine concentrations was 3.888, 6.935 and 8.116 g/d, respectively. Expected requirements obtained from these formulae were in general agreement with previous estimates. Based on the weight gain vs N gain equation, about 4.44% of the retained protein was comprised of methionine + cystine and compared to 3.31%, the mean methionine + cystine content of pig muscle CP.

• Asian-Australasian Journal of Animal Sciences
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• 제10권1호
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• pp.54-63
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• 1997

Purified diets containing 5 graded levels of lysine were fed to young and growing pigs to determine the lysine requirement for growth and maintenance. A model was developed to subdivide the lysine requirement for the maintenance from requirement for growth. From this model, the lysine requirement for growth was 18.018 and 19.431 g/kg live weight gain and the maintenance requirement was 0.115 and 0.033 g per unit of metabolic body size at each stage of growth, respectively. In the young pigs, the lysine requirement for growth was 0.950 g/g N gain and the maintenance requirement was 0.114 g per unit of metabolic body size. The breakpoint of plasma lysine concentrations was 8.695 and 13.464 g/d, respectively. Expected requirements obtained from these formulae were in general agreement with previous estimates. Based on weight gain vs N gain equation, about 7.92% of the retained protein was comprised of lysine as compared to 7.11%, the mean lysine content of pig muscle CP.

• 대한지구과학교육학회지
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• 제1권1호
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• pp.85-98
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• 2008

Though the investigation of the suggested references proverbs related weather were collected and considered the probability of the usage on science instruction. The results are as follows. 130 proverbs related to weather were collected through the investigation of the suggested references. Most of weather proverbs are based on the states of sky, clouds, wind, precipitation, actions of animal, states of plants and the condition of people in daily life. they were classified according to weather types, natural phenomena and seasons. According to the results of analysing the students' recognition and interests on weather proverbs, most of students heard weather proverbs in their elementary school years firstly through their parents, books, and teachers. However they have only heard a few. Also many students also tend to think weather proverbs have a scientific base because weather proverbs have been told by many people through the ancient time and correspond to their personal experiences. Students responded that weather proverbs are useful for science learning on weather and can teach heritage and wisdom. After reading the suggested weather proverbs, their interests on weather proverbs were increased more than before reading. This is one of reasons why weather proverbs can be introduced to science classes. Weather proverbs were considered related to science curriculum. The third grade has a Unit "Fine days and Cloudy days", the fifth grade, "Unit of Weather Change", the Sixth grade, "Unit of Weather Forecast" , the Ninth grade, "Unit of Water cycle and Weather Change" and the tenth grade has "Unit of Earth". So the author consider that weather proverb materials can be used so effectively to bring about interest and motive in science learning.