• 제목/요약/키워드: dish

검색결과 1,073건 처리시간 0.021초

반사경 배치 및 흡수기 형상에 따른 접시형 태양열 집열기의 열손실 해석 (Analysis of Heat Loss with Mirror Array and Receiver Shapes on the Dish Solar Collector)

  • 서주현;마대성;김용;강용혁;서태범
    • 설비공학논문집
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    • 제20권1호
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    • pp.35-41
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    • 2008
  • The radiative heat loss from a receiver of a dish solar collector is numerically investigated. The dish solar collector considered in this paper consists of a receiver and multi-faceted mirrors. In order to investigate the performance comparison of dish solar collectors, six different mirror arrays and four different receivers are considered. A parabolic- shaped perfect mirror of which diameter is 1.40 m is considered as the reference for the mirror arrays. The other mirror arrays which consist of twelve identical parabolic-shaped mirror facets of which diameter are 0.405 m are suggested for comparison. Their reflecting areas, which are 1.545 $m^{2}$, are the same. Four different receiver shapes are a conical, a dome, a cylindrical, and a unicorn type. The radiative properties of the mirror surfaces and the receiver surfaces may vary the thermal performance of the dish solar collector so that various surface properties are considered. In order to calculate the radiative heat loss in the receiver, two kinds of methods are used. The Net Radiation Method that is based on the radiation heat balance on the surface is used to calculate the radiation heat transfer rate from the inside surface of the receiver to the environment. The Monte-Carlo Method that is the statistical approach is adopted to predict the radiation heat transfer rate from the reflector to the receiver. The collector efficiency is defined as the results of the optical efficiency and the receiver efficiency. Based on the calculation, the unicorn type has the best performance in receiver shapes and the STAR has the best performance in mirror arrays except the perfect mirror.

제주지역 초.중학교 학생들의 끼니별 나트륨섭취 실태 조사 (A study of the major dish group, food group and meal contributing to sodium and nutrient intake in Jeju elementary and middle school students)

  • 고양숙;강혜연
    • Journal of Nutrition and Health
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    • 제47권1호
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    • pp.51-66
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    • 2014
  • 제주지역 초등학생 701명과 중학생 1,184명을 대상으로 끼니별, 식품군별, 음식군별 나트륨 섭취 실태를 파악하였으며 그 결과는 다음과 같다. 초등학교 조사대상자는 에너지 권장섭취량의 남, 여학생 각각 87.5%, 93.9%이었고, 중학생은 남 여학생 각각 86.1%, 91.7% 이었다. 나트륨 섭취량은 초등학교 남학생이 2,917.2 mg, 여학생 2,819.5 mg이었고, 중학생은 남학생이 3,336.6 mg, 여학생 2,828.1 mg이었다. 초등학생은 하루 총 식품 섭취량의 39.1%를 간식에서 중학생은 점심에서 34.3%를 섭취하고 있었다. 초등학생의 총 열량 섭취량에 대한 아침, 점심, 저녁, 간식의 열량 섭취 비율은 19.8%, 26.8%, 29.8%, 23.6%이었고, 중학생의 경우 열량 섭취 비율은 17.2%, 33.6%, 27.2%, 22.0%이었고, 이에 비해 각 끼니별 나트륨 섭취 비율은 초등학생의 경우 18.0%, 35.1%, 32.8%, 14.1%이었고, 중학생은 15.3%, 40.2%, 29.1%, 15.5%이었다. 초등학생, 중학생 모두 학교급식으로 인하여 점심에서 얻어지는 열량 및 나트륨 섭취량이 가장 높음을 알 수 있었다. 나트륨 섭취량이 높은 식품군은 양념류 (초등학생 1,252.5mg, 중학생 1,158.0 mg), 채소류 (초등학생 409.0 mg, 중학생 495.6 mg), 곡류 (초등학생 322.4 mg, 중학생 647.8 mg), 어패류 (초등학생 255.3 mg, 중학생 336.6 mg)이었으며, 곡류군을 제외한 이들 식품군은 점심과 저녁에서 그 사용량이 더 높았고 이는 학교급식이나 저녁에 먹는 부식의 다양성을 보여주고 있었다. 이에 비해 간식에서 나트륨 섭취비율이 높은 식품군은 곡류군으로 초등학생은 하루 총 나트륨 섭취량의 5.9%를 중학생은 9.8%를 섭취하는 것으로 나타나 이와 관련된 간식 음식 선택에 대한 교육이 필요하다고 본다. 음식군별 나트륨 섭취 비율은 초등학생 중학생 모두 국류와 찌개류에서 나트륨 섭취량의 19.8%와 25.4%를 섭취하는 것으로 나타났다. 이어 나트륨 섭취비율이 높은 음식은 김치류이었다. 전체적으로 무침류, 국류, 김치류, 구이류, 볶음류, 일품요리 등에서 나트륨 섭취 비율이 높았다. 끼니에 따른 나트륨 섭취비율을 보면 점심에서 국, 김치, 찌개, 튀김, 볶음 등 다양한 부식에서 얻어지고 있었고, 저녁에는 면류, 구이, 일품요리 등에서 간식에서는 빵 과자류, 면류에서 나트륨 섭취가 높은 것으로 나타났다. 이상의 결과를 종합해 볼 때 제주지역 초 중학교 학생들의 나트륨 섭취 실태는 점심식사에서 다양한 부식을 통한 나트륨 섭취량이 높은 것으로 나타났다. 단백질 급원 식품이나 미량영양소의 공급을 고려하면, 채소와 어패류, 해조류, 육류 등으로 다양한 조리방법을 사용하는 음식군의 배제보다는 짠맛을 조절할 수 있는 미각교육이 필요하다고 여겨지며, 아울러 나트륨 섭취비율이 가장 높은 국물 섭취에 대한 영양교육과 또한 점심에서 얻어지는 나트륨 섭취 비율이 높으므로 학교급식 조리종사자 및 영양사를 대상으로도 나트륨 저감화를 위한 교육이 필요하다. 부식보다는 나트륨 섭취 비율이 낮지만 간식에서 섭취되는 면류인 라면이나, 빵 과자류, 음료는 나트륨 섭취도 높일 뿐 아니라 열량 섭취도 높이므로 과일과 우유 및 유제품 등의 올바른 간식 음식 선택에 대한 교육도 나트륨 섭취를 줄일 수 있는 방법이다.

Culture Conditions for In Vitro Maturation of Abattoir Derived Oocytes of Native Zebu Cows of Bangladesh

  • Morshed, S.M. Niyaz;Bhuiyan, Mohammad Musharraf Uddin;Rahman, Mohammad Moshiur;Singha, Joydev Kumer;Juyena, Nasrin Sultana
    • 한국수정란이식학회지
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    • 제29권3호
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    • pp.201-206
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    • 2014
  • The objectives of the study were to determine an effective culture dish, culture duration and protein supplementation in medium for in vitro maturation (IVM) of oocytes of native zebu cows in Bangladesh. The ovaries of cows were collected from local slaughterhouse followed by aspiration of follicular fluid. The cumulus-oocyte-complexes (COCs) with more than 3 compact cumulus cell layers were cultured in tissue culture medium (TCM) 199 for maturation. The maturation of oocytes was determined by observing polar body under microscope. To determine an effective culture dish, 130 COCs derived from 48 ovaries in a well of 4-well dish and 102 COCs derived from 36 ovaries in drops covered with mineral oil within 35 mm petri dish were cultured for 24 hours. The rate of maturation of oocytes did not vary between 4-well dish ($51.3{\pm}15.0%$) and drops in petri dish ($52.4{\pm}11.6%$). To determine the effective culture duration, 185 COCs derived from 62 ovaries were cultured in drops for 18, 21, 24 and 27 hours. The rate of maturation of occytes ranged from $51.9{\pm}9.4%$ (18 hours) to $59.0{\pm}17.1%$ (27 hours) and the difference in maturation rate among different culture durations was not significant (P>0.05). To determine an effective protein supplementation, 63 oocytes from 19 ovaries were cultured separately in TCM 199 supplemented with either fetal bovine serum (FBS) or bovine serum albumin (BSA). The rate of maturation was significantly (P<0.01) higher in medium supplemented with FBS ($55.63{\pm}16.19%$) than that of BSA ($14.82{\pm}9.36%$). In conclusion, COCs of native zebu cows can be cultured for IVM either in 4-well culture dish or droplets in petri dish for 18 to 27 hours in medium supplemented with FBS.

당과 후기당화합물의 생체 외 사구체여과율 모델에 대한 역할 (Effects of High Glucose and Advanced Glycosylation Endproducts(AGE) on the in vitro Permeability Model)

  • 이준호;하태선
    • Childhood Kidney Diseases
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    • 제10권1호
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    • pp.8-17
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    • 2006
  • 목적 : 생체 외 당뇨병 상태로서 고농도의 당을 포함하는 배양액과 후기당화합물을 적용하여 세포배양하고 이때에 나타나는 병리적 변화, 즉, 세포외 기질의 변화와 형태학적 변화와 함께 투과성(여과율)의 변화를 살펴보았고 동시에 당뇨병성 신증에서의 단백뇨의 기전을 설명하고자 하였다. 방법 : 후기당화합물의 준비를 위해 50mg/mL BSA(Fraction V, Sigma)와 pretense inhibitor를 포함한 PBS(pH 7.4)에 glucose-6-phosphate를 섞어 0.2 M의 용액을 만들었다. BSA를 대조군으로 하였으며, 후기당화합물과 BSA를 $5{\mu}g/cm^2$ surface area의 농도가 되도록 붓고 다음과 같은 비교 대상의 culture dishes를 만들었다(B5; BSA만 첨가 - 5 mM, B30; BSA만 첨가 - 30mM, A5; 후기당화합물만 첨가 - 5 mM, A30; 후기당화합물만 첨가 - 30 mM, A/B 25: osmotic control - 25 mM mannitol). 이틀 배양 후와 일 주 배양 후 각각의 culture dishes에 있는 heparan sulfate proteoglycan (HSPG)양을 ELISA를 이용하여 측정하고 B5를 대준군으로 하여 각각 비교하였다. 각각의 colture dishes에 있는 사구체 상피세포를 scanning EM(Hitachi S-570, Japan)을 이용하여 형태학적 관찰을 하였다. Cellulose semi-permeable membrane을 이용하여 각각의 culture dishes에서 두 시간 동안 apical chamber를 통해 여과되는 BSA양을 sandwich ELISA method로 측정하여 투과성에 대한 분석을 하였다. 결과 : 이틀 동안 배양 후 측정한 대조군을 포함한 다섯 culture dishes의 HSPG양은 통계학적 차이는 없었다. 일 주 배양 후에 이틀 동안 배양한 B5 dish에 비해서 일 주 배양한 A30 dish를 제외한 일 주 배양한 모든 dishes에서 10% 이상의 HSPG양의 증가를 보였다(P<0.05) 일 주 배양한 B5 dish에 비해선 일 주 배양한 A30과 B30 dish에서 각각 HSPG양이 각각 77.8%와 95.3%로 감소하였고(P>0.05), osmotic control group(A/B 25)에선 통계적으로 유의한 차이를 보이지 않았다(P>0.05). 후기당화합물이 첨가된 경우에 SEM상 분리된 세포사이이음(intercellular junction)과 융합된 미세융모를 관찰할 수 있었다. BSA의 투과성은 일 주 배양 후 A30 dish에서만 일 주 배양 후 B5 dish에 비해 19% 증가하는 소견을 보였으나 통계적인 유의성은 없었다(P>0.05). 결론 : 사구체 상피세포의 HSPG 형성의 감소에 고농도의 당과 후기당화합물은 서로 부가적인 역할을 하고 후기당화합물이 더 큰 역할을 함을 알 수 있다. HSPG 감소 소견과 더불어 SEM상 장기간 고혈당을 유지하면 사구체 여과기전에서 size-selective와 charge-selective 장벽에 결함을 유발할 수 있으며 당뇨병에서의 단백뇨의 기전 중 하나로 생각된다.

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우리나라 성인의 나트륨 섭취량 추정을 위한 음식섭취빈도조사지의 개발과 타당성 검증에 관한 연구 (Development and Evaluation of Validity of Short Dish Frequency Questionnaire (DFQ) for Estimation of Habitual Sodium Intake for Korean Adults)

  • 손숙미;박영숙;임화재;김숙배;정연선
    • 대한지역사회영양학회지
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    • 제12권6호
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    • pp.838-853
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    • 2007
  • The aim of this study was to develop various types of a dish frequency questionnaire (DFQ) for estimating the habitual sodium intake and to evaluate the validity of a 125 item dish frequency questionnaire (DFQ 125) with the DFQ 70, DFQ 36 and DFQ 15. For the DFQ 125, one hundred and twenty five dish items were selected based on the information of sodium content of a one serving size, consumption frequency and dish items that contributed most to the variation of sodium intake. Frequency of consumption was determined through nine categories ranging from more than 3 times a day to almost never to indicate how often the specified amount of each food item was consumed during the past 6 months. The sodium intake estimated with DFQ 125 was $5775.0{\pm}3636.3mg$, 12.6% higher than that estimated with a 24 hr urine analysis ($5009.7{\pm}1541.9mg$) and significant correlation was observed between them (r=0.3315, p<0.001). When sodium content in broth leftover was subtracted from the total intake, the actual sodium intakes was decreased to $5309.6{\pm}3076.6mg$, which was 3.2% higher than that with a 24-hr urine analysis. Overall, 56% of subjects in the lowest quintile of sodium intake computed with DFQ 125 were also in the lowest of adjacent quintile while categorization into the opposite quintile were 4.9%. DFQ 70 was developed from DFQ 125 by omitting the food items not frequently consumed, selecting the dish items that showed higher sodium content per one portion size and higher consumption frequency. The sodium intake estimated with DFQ 70 ($5026.6{\pm}3107.1mg$) showed only 0.2% difference from that estimated with a 24-hr urine analysis, significant correlation with it (r=0.3199, p<0.001) and higher proportion of subjects to be classified into the same or adjacent quintile. The sodium intake estimated with DFQ 36 or DFQ 15 was also significancy correlated with that estimated with a 24-hr urine analysis (r=0.3441, p<0.001; r=0.321, p<0.001 respectively) and more. The proportion of subjects was classified into the same or adjacent quintile. However, the actual sodium intake estimated with DFQ 36 or DFQ 15 were $3534.0{\pm}1804.6mg\;and\;2508.0{\pm}1261.5mg$, respectively, 31.3% or 51.3% less than that estimated with a 24-hr urine analysis. It seems the DFQ 125 with subtraction of sodium content in broth leftover or DFQ 70 can be used quantitatively to estimate sodium intake of adults. DFQ 36 or DFQ 15 can be used as a screening tool or to assess the changes of sodium intake after nutrition education.

삭과의 착생부위(着生部位)가 참깨종자(種子)의 발아(發芽) 및 초기생육(初期生育)에 미치는 영향(影響) (Effect of Capsule Position on the Seed Germination and Juvenile Growth of Sesame (Sesamum indicum L.))

  • 김충수
    • 농업과학연구
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    • 제9권1호
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    • pp.223-230
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    • 1982
  • 참깨의 적정입모확보(適正立毛確保)를 위한 기초자료(基礎資料)를 얻고 저 청송등(等) 6개품종(個品種)에서 삭과착생부위별로 채취(採取)한 종자(種子)를 공용(供用)하여 발아(發芽) 및 초기생육(初期生育)을 조사(調査)하였던 바 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 파종기(播種期)를 지연(遲延)시킴에 따라 각품종(各品種)의 개화(開花)까지 일수(日數)는 현저(顯著)한 감소(減少)를 보였는데 파종기지연(播種期遲延)에 따르는 개화(開花)까지 일수(日數)의 감소정도(減少程度)는 품종간(品種間)에 현저(顯著)한 차이(差異)를 나타 내었다. 2. petri dish나 pot에서 공(共)히 IS103을 제외(除外)한 전공시품종(全供試品種)에서 하위절(下位節)에서 채취(採取)한 종자(種子)의 발아율(發芽率)이 하위절채취종자(下位節採取種子)의 발아율(發芽率) 보다 높았다. 3. IS103은 하위절(下位節)에서 채취(採取)한 종자(種子)의 발아율(發芽率)은 petri dish에서는 20%, pot에서는 75%의 발아율(發芽率)을 보였고 상위절채취종자(上位節採取種子)에서는 petri dish에서는 17.0% pot에서는 72.5%의 낮은 발아율(發芽率)을 보였다. 4. 발아세(發芽勢)에 있어서도 발아율(發芽率)과 같은 경향(傾向)으로 하위절채취종자(下位節採取種子)가 상위절채취종자(上位節採取種子)의 발아세(發芽勢)보다 높았으며, petri dish에서의 발아세(發芽勢)보다 pot에서의 발아세(發芽勢)가 현저(顯著)히 낮았다. 5. 초장(草長), 근장(根長), 엽장(葉長) 및 생체중등(生體重等)은 전공시품종(全供試品種)에서 하위절채취종자(下位節採取種子)가 상위절채취종자(上位節採取種子)보다 컸으나 종자입중(種子粒重)에 따르는 발아율(發芽率) 및 초기생육(初期生育)은 동일품종내(同一品種內)에서는 그 차이(差異)가 인정(認定)되나 품종간(品種間)에는 인정(認定)되지 않았다.

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가례도감의궤(嘉禮都監儀軌)에 나타난 조선왕조궁중가례상(朝鮮王朝宮中嘉禮床)차림고(考) -1866년(年) 고종(高宗) 명성후(明成后), 1906(年) 순종(純宗) 순종비(純奈妃) 가예동뢰연(嘉禮同牢宴)- (A Study on Wedding Feast Dishes in Gare Dogam Euigwae (1866, 1906))

  • 김상보;이성우
    • 한국식생활문화학회지
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    • 제6권3호
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    • pp.265-274
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    • 1991
  • To analyze wedding feast dishes of king and royal prince of Chosun Dynasty (1866, 1906), the author studied historic book Gare Dogam Euigwae, in which the wedding feast dishes of King and Prince in Chosun Dynasty were described. The results obtained from the study were as follows, 1. Dish materials used for wedding ceremony in the year of 1866 was same as that of the year 1749. 2. Dish materials used for wedding ceremony in the year of 1906 was quit different that of the year 1749. 3. Dish materials used for main table(연상(宴床)), second table(좌협상(左挾床)), third table(우협상(右挾床)), and fourth table(면협상(面挾床)) was the same as that of from the year 1651 till 1906. 4. Dish materials used for a small round table(초미(初味)), another table(이미(二味)), and the other table(삼미(三味)) was the same as that of from the year 1749 till 1906. 5. A large boiled beef(대선(大膳)) and a small boiled beef(소선(小膳)) were in the year 1819 and 1906.

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태양추적식 자연채광 장치의 집광기 종류에 따른 성능 분석: 포물 반사경 vs. 프레넬 렌즈 (Performance Analysis on Solar Tracking Daylighting Systems Using Different Types of Solar Collectors: Parabolic Dish vs. Fresnel Lens)

  • 김영민;김원식;정해준;천원기
    • 한국태양에너지학회 논문집
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    • 제37권1호
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    • pp.39-45
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    • 2017
  • This paper presents the effect of solar collectors on the performance of solar tracking daylighting systems. A series of measurements were made for two different types of solar collectors mounted on double axis solar trackers: Parabolic dish concentrator and Fresnel Lens. Indoor light levels were measured at different locations of an office space (longitude: 126.33 E, latitude 33.45 N) as photo sensors were placed on a task plane 80 cm above the floor. To accurately monitor the applicability of the systems, measurements were performed under clear and overcast sky conditions with the roll-screen (on the south window) in the down position. Comparing the illuminance data, the system with Fresnel lens outperformed that of parabolic dish concentrator. On clear days, the former delivered the light levels of 400~600 lux on the task plane whereas the latter recorded 100~200 lux. Depending on the amount of cloud cover, on overcast days, illuminance readings fluctuated to some extent.

다공성 매질의 형상 변화에 따른 접시형 고온 태양열 흡수기의 열성능 평가 (Heat Transfer Analysis of High Temperature Dish-type Solar Receiver with the Variation of Porous Material)

  • 이주한;서주현;오상준;이진규;조현석;서태범
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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    • pp.238-244
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    • 2008
  • A numerical and experimental studies are carried out to investigate the heat transfer characteristics of 5kWth dish-type solar air receiver. Measured solar radiation and temperatures at several different locations are used as boundary conditions for numerical simulation. Many parameters' effects (reflectivity of the reflector, the thermal conductivity of the receiver body, transmissivity of the quartz window, etc.) on the thermal performance are investigated. Discrete Transfer Method is used to calculate the radiation heat exchange in the receiver. A heat transfer model is developed and the rate of radiation, convection and conduction heat transfer are calculated. Using the numerical model, the heat transfer characteristics of volumetric air receiver for dish-type solar thermal systems are known and the thermal performance of the receiver can be estimated.

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대학 교직원 식당에서의 식단중심요리의 다양성 (Diversity of Main Dishes of Menus at University Faculty Cafeterias)

  • 김석영;박미연
    • 대한영양사협회학술지
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    • 제21권4호
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    • pp.320-332
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    • 2015
  • This study investigated the main dishes of menus at university faculty cafeterias to understand current lunch menu trends. A sample of 1040 menus was collected from Internet homepages of 52 universities between March and May, 2014. The main dishes of menus were categorized into six groups based on main ingredients and cooking methods. The most frequently served main dish ingredient was pork followed by fish/seafood, and poultry. Pork dishes and chicken dishes were mainly roasted, pan fried, or deep fried with various carbohydrate ingredients to bulk them up. Large amounts of chili pepper, corn syrup, and oil were added to improve the bland flavor of these dishes, which contain starchy ingredients. In contrast to pork dishes or chicken dishes, 40.2% of beef dishes was served in a more traditional way as soup. Fewer kinds of fish or seafood were used, and the cooking methods also lacked diversity. In conclusion, main dish menus at university faculty cafeterias have undergone changes in terms of ingredients and cooking methods. Meat dishes cooked using traditional methods are becoming less common, especially for pork and chicken dishes, which are quite sweet, salty, and spicy. Extensive use of carbohydrate ingredients was found in some meat dishes and side dishes in one-dish meals.