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서울시내 고소득층 아파트단지 국민학교 어린이의 혈청지질수준에 영향을 주는 식이와 체격에 관한 조사연구
모수미,최혜미,이윤나,김주혜,김진규 한국지질학회 1993 韓國脂質學會誌 Vol.3 No.2
To evaluate the effects of obesity index and dietary intakes on serum lipid levels of 125 volunteer children, 6 to 12 years old, a survey was conducted at Youido elementary school, which offers no school lunch program, in April and July, 1992. Subjects' fasting blood samples were analyzed for serum triglyceride (TG), total cholesterol and high density lipoprotein cholesterol (HDL-C). Low density lipoprotein cholesterol (LDC-C), LDL-C/HDL-C ratio, and atherogenic index (AI) were calculated. Information on subjects' dietary intakes were obtained by repeated 24-hour recall method for 3 days. Total cholesterol levels of the subjects were 164.4 ㎎/㎗, which was higher than average level of Korean children. Obesity index showed significant (p$lt;0.05) positive correlations to LDL-G, LDL-C/HDL-C ratio and AI. Although total cholesterol level was higher in overweight and obese subjects than that of the normal ones, the difference didn't reach statistical significance due to the individual variations. According to total cholesterol and LDL-C criteria, 36.8% and 20.5% of subjects were in borderline-or high-risk group, respectively. According to TG criterion, 23.8% of the subjects were in risk group of cardiovascular disease. LDL-C and total cholesterol levels were positively correlated. As obesity increases, serum lipid profiles increase to make the risk of cardiovascular disease susceptible. Intake of vegetable foods showed positive correlation to HDL-C and negative correlation to total cholesterol, LDL-C/HDL-C ratio and AI while animal foods showed the opposite effects. This study also found that dietary fiber had the tendency to lower the indices of cadiovascular disease risk. The survey emphasizes the urgent need of the nutrition education through school lunch program to improve the children's health.
Controlling the Shape of a Carbon Nanotube by Using the Reaction Chamber Pressure
D. Q. Duy,김현석,Dang Mo Yoon,Jung Woong Ha,Kang Jea Lee,황용규,Bach Thanh Cong,이충훈 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
We report the effects of the reaction chamber pressure on the shape and the structure of verticallyaligned carbon nanotubes (CNT) grown on a Ni catalyst by using dc plasmaenhanced chemical vapor deposition system. By controlling the pressure of the reaction chamber We were able to alter the shape and the crytallinity of CNTs. With increasing the chamber pressure, the length was rapidly reduced from 4.5 μm to 800 nm, but the crytallinity was strongly enhanced. As the reaction chamber pressure decreases, the tips of the CNTs were observed to change from a hemispherical tip with one conical Ni particle to a distorted the tip with more than one tiny Ni particle which means that the formation of Ni conglomerates does not only occur during the pretreatment process but also continues during the CNT growth process. These results have further clarified the role of the reactive etching ions in the growth of CNTs. We report the effects of the reaction chamber pressure on the shape and the structure of verticallyaligned carbon nanotubes (CNT) grown on a Ni catalyst by using dc plasmaenhanced chemical vapor deposition system. By controlling the pressure of the reaction chamber We were able to alter the shape and the crytallinity of CNTs. With increasing the chamber pressure, the length was rapidly reduced from 4.5 μm to 800 nm, but the crytallinity was strongly enhanced. As the reaction chamber pressure decreases, the tips of the CNTs were observed to change from a hemispherical tip with one conical Ni particle to a distorted the tip with more than one tiny Ni particle which means that the formation of Ni conglomerates does not only occur during the pretreatment process but also continues during the CNT growth process. These results have further clarified the role of the reactive etching ions in the growth of CNTs.
Characteristics of waterflood at low rate in low permeability sandstones based on the CT scanning
S.Y. Mo,Q. Lei,G. Lei,S.H. Gai,Z.K. Liu 한국자원공학회 2018 Geosystem engineering Vol.21 No.6
It is reported that the flooding rate in low permeability sandstones is low and the oil recovery is hard to increase after water breakthrough. Understanding characteristics of waterflood is hence important for the recovery improvement. In this work, flooding tests on low permeability sandstones were conducted. The corresponding flooding characteristics were investigated by means of CT scanning and Nuclear Magnetic Resonance. Effects of irreducible water and different rates were also discussed in detail. Experimental results reveal a piston-like displacement at a low rate in low permeability samples. The saturation profile is steep and almost vertical to the forward direction. The results at a low rate confirm that once water broke through, increasing the flooding rate or flooding time can hardly reduce the remaining oil inside the sample. It is probably due to the high pore-throat ratio proven by rate-controlled mercury. Results also confirm that the presence of initial water enhanced sweep efficiency substantially. On one hand, because water had previously occupied the small pores, the subsequent oil can only invade relatively large pores and became more movable. On the other hand, stable collars can not form due to the steep front, which may suppress the snap-off.
An improved particles model for stress sensitivity in low-permeability sandstones
S. H. Gai,H. Q. Liu,S. L. He,G. Lei,S. Y. Mo,X. Huang,Y. Yang,X. Chen 한국자원공학회 2016 Geosystem engineering Vol.19 No.2
Stress-dependent permeability and porosity of porous media is very important for the development of oil reservoirs, especially in low-permeability reservoirs. Porous structure can change in response to an increase in the effective stress to induce the decline of permeability and porosity, which ultimately affects the fluid flow property. In this study, a capillary module, considering the arrangement and the deformation of particles, has been established to express the stress sensitivity of porous media based on the particle packing model. The predictions of variation of permeability by the proposed model have been validated by comparing with the experimental data. The predictions by the current model show the same variation trend with the experimental data and are consistent with the compression experiments. The proposed variation of permeability with the increase in effective stress depends on the factors such as the arrangement of particles (contact angle), the deformation of particles (elastic module and Poisson’s ratio) and effective stress. The effects of these parameters on variation of permeability are discussed in detail.
조규태,이주,오봉세,방종득,김윤,전임기,안명모,Jo, Q-Tae,Lee, Chu,Oh, Bong-Se,Bang, Jong-Deuk,Kim, Yoon,Jeon, Im-Gi,Ahn, Myoung-Mo The Korean Society of Fisheries and Aquatic Scienc 2007 韓國養殖學會誌 Vol.20 No.2
We studied two research items that can be undetermined issues in the artificial seed production of the Japanese scallops, Patinopecten yessoensis, batch-specific quality of the reproductive outputs and nursery acclimation, in the embayed waters of Yangyang, Gangwon, Korea. The first batch of the spawner showed better results in terms of survival, growth, and resistance against parasitic ciliate infection over the second batch that was obtained in 5 days after first batch from the same spawner. The early attached spats directly placed in the farming ground (the unacclimated) were resistant against the water current of the open environment, by showing survival of about 80% for a month, a normal survival compared with other results. However, the spat survival during the nursery acclimation was significantly lowered in comparison with that in the unacclimated condition (P<0.01). We discussed the research results of the two items, particularly focusing on their availability for mass seed production for aquaculture in the Korean coastal waters of the East Sea (Sea of Japan).
Huang, M.,Kim, M.S.,Delwiche, S.R.,Chao, K.,Qin, J.,Mo, C.,Esquerre, C.,Zhu, Q. Applied Science Publishers 2016 Journal of food engineering Vol.181 No.-
<P>Since 2008, the detection of the adulterant melamine (2,4,6-triamino-1,3,5-triazine) in food products has become the subject of research due to several food safety scares. Near-infrared (NIR) hyperspectral imaging offers great potential for food safety and quality research because it combines the features of vibrational spectroscopy and digital imaging. In this study, NIR hyperspectral imaging was investigated for quantitative evaluation of melamine particles in nonfat and whole milk powders. Melamine was mixed into milk powders in a concentration range of 0.02-1.00% (w/w). A NIR hyperspectral imaging system was used to acquire images (938-1654 nm) of melamine powder, whole milk powder, nonfat milk powder, and mixtures of melamine and each of the milk powders. Two optimal bands (1447 nm and 1466 nm) were selected by a linear correlation algorithm with pure milk and pure melamine. Band ratio (13144711455) images coupled with a single threshold were used to create resultant images to visualize identification and distribution of the melamine adulterant particles in milk powders. The identification results were verified by spectral feature comparison between separated mean spectra of melamine pixels and milk pixels. Linear correlations (r) were found between the number of pixels identified as containing melamine and melamine concentration in nonfat milk and whole milk powders, which were 0.980 and 0.970 or higher, respectively. The study demonstrated that the combination of NIR hyperspectral imaging and simple band ratioing was promising for rapid quantitative analysis of melamine in milk powders. Published by Elsevier Ltd.</P>