Effects of Chitosan Intake on Bone Mass, Bone Related Metabolic Markers in Ovariectomized Rats

Jang, Ye Sun,Lee, Myoung Hee 제주관광대학 2005 論文集 Vol.11 No.-

In the present study we examined both the etiology of bone loss induced by dietary chitosan and the preventive effect of vitamin C supplementation. Rats were OVX and maintained on one of the following diets for 4 weeks: 10% cellulose (CE), 10% chitosan (CH) and 10% chitosan with sodium ascorbate (CHVC). Vitamin C supplementation to CH caused an increase in Ca and P contents of femurs as well as BMD of L4, with a decrease in urinary Ca excretion. There was no significant difference in intestinal Ca absorption between CH and CE, whereas CH intake significantly reduced intestinal P absorption. CH caused a significant reduction in BMD and stiffness of femurs as well as fourth lumbar vertebrae (L4). The bone loss in CH rats was accompanied with an increase in urinary Ca excretion and a decrease in serum Ca as well as a significant increment in serum PTH and 1,25(OH)2D3. These results indicates that dietary chitosan with low Ca intake possibly induces the loss of bone mass by enhacing urinary Ca excretion, rather than by inhibiting Ca absorption, and that vitamin C supplementation could prevent bone loss caused by chitosan through the increment of retained Ca followed by suppression of urinary Ca excretion.

Modeling of CO₂ Emission from Soil in Greenhouse

Lee, Dong-Hoon,Lee, Kyou-Seung,Choi, Chang-Hyun,Cho, Yong-Jin,Choi, Jong-Myoung,Chung, Sun-Ok Korean Society of Horticultural Science 2012 원예과학기술지 Vol.30 No.3

Greenhouse industry has been growing in many countries due to both the advantage of stable year-round crop production and increased demand for fresh vegetables. In greenhouse cultivation, $CO_2$ concentration plays an essential role in the photosynthesis process of crops. Continuous and accurate monitoring of $CO_2$ level in the greenhouse would improve profitability and reduce environmental impact, through optimum control of greenhouse $CO_2$ enrichment and efficient crop production, as compared with the conventional management practices without monitoring and control of $CO_2$ level. In this study, a mathematical model was developed to estimate the $CO_2$ emission from soil as affected by environmental factors in greenhouses. Among various model types evaluated, a linear regression model provided the best coefficient of determination. Selected predictor variables were solar radiation and relative humidity and exponential transformation of both. As a response variable in the model, the difference between $CO_2$ concentrations at the soil surface and 5-cm depth showed are latively strong relationship with the predictor variables. Segmented regression analysis showed that better models were obtained when the entire daily dataset was divided into segments of shorter time ranges, and best models were obtained for segmented data where more variability in solar radiation and humidity were present (i.e., after sun-rise, before sun-set) than other segments. To consider time delay in the response of $CO_2$ concentration, concept of time lag was implemented in the regression analysis. As a result, there was an improvement in the performance of the models as the coefficients of determination were 0.93 and 0.87 with segmented time frames for sun-rise and sun-set periods, respectively. Validation tests of the models to predict $CO_2$ emission from soil showed that the developed empirical model would be applicable to real-time monitoring and diagnosis of significant factors for $CO_2$ enrichment in a soil-based greenhouse.

Modeling of CO₂ Emission from Soil in Greenhouse

Dong Hoon Lee,Kyou Seung Lee,Chang Hyun Choi,Yong Jin Cho,Jong-Myoung Choi,Sun-Ok Chung 한국원예학회 2012 원예과학기술지 Vol.30 No.3

Greenhouse industry has been growing in many countries due to both the advantage of stable year-round crop production and increased demand for fresh vegetables. In greenhouse cultivation, CO₂ concentration plays an essential role in the photosynthesis process of crops. Continuous and accurate monitoring of CO₂ level in the greenhouse would improve profitability and reduce environmental impact, through optimum control of greenhouse CO₂ enrichment and efficient crop production, as compared with the conventional management practices without monitoring and control of CO₂ level. In this study, a mathematical model was developed to estimate the CO₂ emission from soil as affected by environmental factors in greenhouses. Among various model types evaluated, a linear regression model provided the best coefficient of determination. Selected predictor variables were solar radiation and relative humidity and exponential transformation of both. As a response variable in the model, the difference between CO₂ concentrations at the soil surface and 5-㎝ depth showed are latively strong relationship with the predictor variables. Segmented regression analysis showed that better models were obtained when the entire daily dataset was divided into segments of shorter time ranges, and best models were obtained for segmented data where more variability in solar radiation and humidity were present (i.e., after sun-rise, before sun-set) than other segments. To consider time delay in the response of CO₂ concentration, concept of time lag was implemented in the regression analysis. As a result, there was an improvement in the performance of the models as the coefficients of determination were 0.93 and 0.87 with segmented time frames for sun-rise and sun-set periods, respectively. Validation tests of the models to predict CO₂ emission from soil showed that the developed empirical model would be applicable to real-time monitoring and diagnosis of significant factors for CO₂ enrichment in a soil-based greenhouse.

다이빙 조사에 의한 가을철 가거도 연안의 어류상

명정구,조선형,박정호,백상규,김종만,강필선 한국어류학회 2003 韓國魚類學會誌 Vol.15 No.3

1. 2002년 10월 16∼17일에 스쿠버다이빙, 수중 촬영을 통하여 전라남도 신안군 가거도 주변 가을철 연안의 어류상을 조사한 결과 총 5목 23과 40종이 확인되었고, 지금까지 기재 된 어종 이외에 18종이 추가로 확인되었다. 2. 어종 구성으로 보면 양볼락과가 7종으로 가장 많았으며, 그 다음으로 둑중개과가 4종, 자리돔과가 3종 순이었다. 3. 가거도 주변에서 지금까지 확인된 어종들은 온대성 어종이 대부분이었지만, 그 외에 노랑자리돔, 청황베도라치 및 파랑돔 등 난류성 또는 아열대 어종이 확인되어 제주도나 독도와 마찬가지로 대마난류의 영향도 받고 있음을 나타내었다. The fish fauna in the coastal waters of Gageodo Island, South-west Sea, was investigated by SCUBA diving in October 16 and 17, 2002. The fishes observed were classified into 40 species in 23 families. In Autumn, subtropical fishes in such as families as Pomacentridae, Pomacanthidae and Apogonidae, represented 12.5% of the total, while eurythermal species represented 72.5%.

건조제를 이용한 벽부형진열장 밀폐도 간접측정

유혜선,김명남,이승은 국립중앙박물관 2001 박물관보존과학 Vol.3 No.-

박물관 진열장의 기밀성은 일반적으로 CO₂ 추적가스를 이용한 밀폐도를 측정함으로서 조사되어 왔지만 진열장 내부에 구멍을 내야하는 점은 사용 전이나 사용 중인 진열장에 대한 밀폐도 측정에 적용하는데 문제점으로 지적되어 왔다. 이에 진열장의 형상을 변화시키지 않고, 진열장의 밀폐도를 간접측정함으로서 사용 전이나 필요에 따라서는 전시중인 진열장에 대한 밀폐도를 측정할 수 있는 대안을 제시하고자 하였다. 밀폐도 간접측정법은 진열장 내부의 온습도 변화와 습도조절제(Art-sorb)의 중량변화를 통해 진열장의 기밀도를 간접적으로 알아보는 방법이다. 실험은 동일장소에 시공된 3개의 벽부형진열장을 대상으로 진열장내 조명을 켜지 않고 Art-sorb와 온습도 수집기를 넣고 12일간 진행하였다. 각 진열장내 온도와 습도 변동분을 주변변동분으로 나눠 변동율로 나타냈으며, 그 결과 온도 변동율에서는 벽부장A(0.67)가 벽부장B(0.69)나 벽부장C(0.79)보다 변동율이 적었으며 습도 변동율에서도 벽부장A(0.12)가 벽부장B(0.19)나 벽부장C(0.72)보다 변동율이 적어 기밀도가 가장 양호함을 알 수 있었다. 또한 CO₂추적가스를 이용한 직접 밀폐도 측정에서의 공기교환율에 대하여 간접 밀폐도 측정에서의 습도변동율을 대입해 보았다. The airtightness of museum cases in museums was measured by using CO₂ tracing gas, but it has been pointed that it has a problem with measuring the airtightness of a museum case which has a hole inside before it is used or while is being used. So studies tried to come up with alternatives which make it possible to measure the airtightness of a museum case before it is used or while it is being used if necessary by indirectly measuring the airtightness of the museum case without changing its form. Indirect measuring is done by measuring the change of Art-sorb weight and the change of temperature and humidity inside the museum case. Experiments were made for 12 days with three builtin wall case installed at the same place without turning on the lights but with Art sorb and the data logger of temperature and humidity put into museum case. The change rate was produced with the change of temperature and humidity inside the museum case divided by that of those around museum case. As a result, the temperature change rate of museum case A(0.67) was lower than that of museum case B(0.69) or museum case C(0.79). The humidity change rate of museum case A(0.12) was lower than that of museum case B(0.19) or museum case C(0.72) showing that its airtightness was the best. Also in the direct airtightness measurement by CO₂ tracing gas, the air exchange rate was compared with the humidity change rate by Art-sorb in the indirect measurement.

흰 민들레 추출물의 항산화능 및 항균활성

박명수, 라만, 임우종, 김기윤, 우성만, 이선미, 사동민 忠北大學校 農業科學硏究所 2011 農業科學硏究 Vol.27 No.4

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밀폐장내 실리카겔의 습도조절 효과 연구

김명남,유혜선 국립중앙박물관 2000 박물관보존과학 Vol.2 No.-

본 실험은 국립박물관을 비롯한 현재 국내외 박물관 및 미술관에서 주로 사용하고 있는 습도조절제(ART-SORB)의 효능을 측정하여 미소환경 조절시 보다 효과적으로 사용할 수 있는 기초자료를 축적하는데 그 목적이 있다. 실험은 외기의 영향을 배제시키고 습도조절제만의 효과를 측정하고자 밀폐조건하에서 수행하였다. 보관장 크기를 고려한 일정량의 ART-SORB 및 카세트(cassette) 형태의 ART-SORB를 투여하여 습도조절 능력을 측정하였다. 실험결과 체적당 정량을 사용한 실험에선 10~17시간 후 목표습도에 도달하였고, 카세트 단위의 과량의 ART-SORB 사용시에는 5~6시간 시간 내에 목표습도에 도달하였으며, 50〜70% RH 범위내에서 습도 조절이 가능함을 확인 할 수 있었다. 또한 ART-SORB는 저습조건에서 습도를 상승시키는데 탁월한 효과가 있었으며, 고습조건에서는 습도조절 능력이 미약했다. 그러므로 ART-SORB는 높은 습도조건이 요구되는 유물 (목기, 칠기류,서화류 등)의 미소환경관리에 보다 효과적인 완충재임을 알 수 있었다. 그러나 본 실험은 밀폐성이 우수한 보관장에서의 실험이므로 실제진열장에 그대로 적용된다고 보기는 어렵다. 따라서 밀폐성이 보장되는 진열장이 우선 마련되어야 습도조절제의 효과가 크게 발휘될 수 있다. The purpose of this study is to evaluate the effect of ART-SORB which is commonly used in museums and galleries at home and abroad including National Museum of Korea, so as to collect useful information to control micro-environment. Experiment was conducted in air-tight condition in order to eval-uate only the effect of ART-SORB excluding any influence from outside factors. A certain amount of ART SORB considering the case size and ART-SORB in cassette type were used to evaluate the humidity con trolling capability. The result showed that target humidity was reached in 10~17 hours in case of using corresponding amount of ART-SORB to the cubic volume and in 5~6 hours in case of excessive use of cassette type ART-SORB. And it also showed that humidity can be controlled in the range of RH 50-70%. In addition, ART-SORB was excellent at raising humidity at low humidity and poor at high humidity. There-fore, ART-SORB turned out to be an effective humidity buffer for controlling micro-environment of such artifacts as wooden ware, lacquer ware and paintings, which require high humidity. However, unfortunately, there are some difficulties in applying this result to real condition, given the fact that this study was conducted under firm air-tight case. Therefore, ART-SORB can be fully effective only in firm air-tight case.

자기 센서를 이용한 자율주행 차량의 경로인식 시스템

김명준,김의선,손석준,오승열,류영재,임영철 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1

바이오피드백 훈련이 만성 두통 환자의 임상 증상 및 스트레스 반응에 미치는 효과

장명선,하양숙,정진상,유범희 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.6

Objectives : This study aimed to examine the effect of biofeedback treatment on the clinical symptoms and stress responses in chronic headache patients. Methods : We recruited 18 chronic headache patients who were treated with 8 sessions of biofeedback treatment and 18 age and sex-matched control headache patients. All subjects consisted of patients with chronic tension headache and migraine hea-dache. Stress responses were measured using Symptoms of stress (SOS) inventory and all subjects performed Beck depression inventory (BDI), Spielberger state anxiety inventory (STAIS), and visual analogue scale (VAS). Biofeedback physiological vaiiables including frontal and forearm EMG, electrodermal response (EDR) and skin temperature at pre-and post-treatment were also measured in all subjects. Results : Compared with control patients, patients on biofeedback treatment showed significant reduction in scores of STAIS(t=3.705,P<.001),andVAS (t=3.392, p=.001) as well as SOS subscales ; peripheral manifestations (t= 1.788, P=.042), habitual pattems (t=2.008, P=.027), depression (t=2.081, P=.023), anxiety (t= 1.990, P=.028), and total score (t=2.045, p=.025). There was a significant increase of skin temperature (t= -1.835, P=.038) only in the biofeedback treatment group. Conclusion : These results suggest that biofeedback treatment may be effective in relieving chronic headache by reducing psychological and physiological stress responses.

Selenium이 마우스의 일차 체액성 면역반응과 접촉성 과민반응에 미치는 영향

최지선,표명윤 숙명여자대학교 약학연구소 2005 약학논문집-숙명여자대학교 Vol.22 No.-

Effects of Selenium (Se) on the primary humoral immune response and contact-delayed type hypersensitivity (CDTH) to 2,4-dinitro-l-fluorobenzene (DNFB) in normal and cyclophosphamide (CY)-treated mice. Se was orally administered via drinking water for 18 days (1ppm or 3ppm) or via intraperitoneal (i.p.) injection with a single dose of 0.05, 0.25, 0.5 mg/kg b.w. to normal and CY-treated mice. CY was i.p, injected to mice with a single dose of 10 or 50 mg/kg b.w. on the last day of Se-administration. When only Se was administered simultaneously with or after immunization, splenic IgM plaque forming cells (PFC) and hemmaglutinin-titer (HA-titer) in mice were not changed, however, decreased in the mice which were administered with high dose of Se before immunization. In addition, they were significantly increased in the concomitant treatment of CY and Se, compared to them in the only CY-treatment. Se significantly decreased DNFB-induced CDTH and inhibited the CY-enhanced CDTH. These results indicate that Se may inhibit the immunotoxicity induced by CY.