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Cutting performance of tool with continuous lubrication at tool-chip interface
Tongkun Cao,Yajun Liu,Yingtao Xu 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.2
To improve lubricating effect and reduce cutting fluid, a new lubricating method was proposed and a new cutting tool was fabricated. A micro-channel connected tool rake face with hydraulic pressure system was fabricated to continuously supply cutting fluid to tool-chip interface. Cutting tests on cast iron were carried out with the new cutting tool and conventional tools. Results show that the cutting forces, the friction coefficient at the tool–chip interface, chip size, the wear area and the adhesive effect of the new tool were significantly reduced compared with those of the conventional tool. EDS analysis results and SEM micrograph of worn surface verified that more cutting fluid can enter into the inner of interface between chip and tool through the micro-channel than flood lubricating. So more area can form liquid film that can reduce cutting force and friction and promote anti-wear. This is the main mechanisms responsible. Although adhesion is reduced, adhesive wear is the main wear mechanism for the new cutting tool as same as conventional tool.
Pai, Tongkun 한국응용생명화학회 2000 Journal of Applied Biological Chemistry (J. Appl. Vol.43 No.3
The effects of storage temperature and high relative humidity (RH) on the weight loss, color change, and microbial activity of a mushroom ('Sylvan' hybrid white) were investigated. The experiment was performed at three temperature (5, 10 and $15^{\circ}C$) and four different relative humidity levels (91, 94, 97 and 99%). The weight loss of the tested samples had a highly correlated linear relationship with storage time at each RH level during storage. Both the storage temperature and RH levels in the experiment had signigicant effects (p<0.05) on the weight-loss rate of the tested samples. The loss whiteness of mushrooms was not significantly affected (p>0.05) by RH ranges at the same temperature. No visible damage was caused by either bacteria or fungi in all samples during storage.
Pai, Tongkun 한국응용생명화학회 2000 Journal of Applied Biological Chemistry (J. Appl. Vol.43 No.4
The effects of high relative humidity (RH) on the physicochemical properties and microbial activity of mature green tomatoes ('Dombito') during refrigerated storage were determined at three temperatures (5, 10, and $15^{\circ}C$) and four different RH levels (91, 94, 97, and 99%). At each temperature, the weight loss rates of tomatoes at different levels of RH were significantly (p<0.05) different from each other. For the samples stored at $10^{\circ}C$, the weight losses were generally higher than those for the samples at $15^{\circ}C$ within the same RH level (i.e., greater vapor pressure deficit). The color change rates ('a' value) showed positive slopes, indicating that the tomato color was changing from green to red. Neither bacteria nor fungi caused visible damages to the samples, and the microbial counts were below 650 colony forming units/$cm^2$ during the test period.
Pai, Tongkun 안양대학교 산업기술연구소 2000 自然科學硏究 Vol.7 No.-
The release of soluble peptides, methionine(Met) and cysteine(Cys) from cooked dry beans- Phaseolus vulgaris cv. Great Northern, Navy, nd Pinto beans- by in vitro proteolysis using an enzyme mixture of trypsin, a-chymotrypsin, peptidse, and protease were investigted. After in vitro enzymatic hydrolysis, more than 90% of the proteins were available as soluble peptides and free amino acids for all dry bean smaples. Greater than 80% of total Met and Cys were available either a soluble peptides of free form. More than 90% of available Met was released during first 4 hr of hydrolysis while the rate fo Cys release increased during the hydrolysis period.
Pai, Tongkun 안양대학교 산업기술연구소 2001 自然科學硏究 Vol.8 No.-
The optimum condition for rat hepatocyte primary cell culture as a model system for studying the role of stearate on cholesterol metabolism was determined. Up to the cell concentration of 1.5x10^6 cells/well, there was a linear relationship (r = 0.96) between the cell number and the quantity of cellular protein recovered after the incubation. Stearate bound to BSA at high levels in the medium (>97%) at all stearate-BSA ratios. Therefore, it is concluded that the cellular protein (mg) can be used as the base unit to express the results and stearate-BSA ratio of 5.6 was determined to be the optimum concentration when considering the difficulty of handling the medium at higher ratios.
상추(Lactuca sativa L.) 유래 항동맥경화물질 규명 및 가공적성 실험을 통한 건강기능성 식품 시제품 개발
배동근 안양대학교 산업기술연구소 2004 自然科學硏究 Vol.11 No.1
우리나라 전역에서 전통적으로 식용 및 약용으로 사용되어온 상추에서 생리활성물질을 탐색한 결과 항동맥경화성이 발견되어 상추로부터 항동맥경화성을 갖는 물질을 분리·정제하여 물질의 구조규명을 한 결과 phytol로 밝혀졌다. 또한 이 상추유래 항동맥경화물질의 열안정성, 광안정성 등 가공적성을 연구하여 이를 토대로 최적의 건강기능성 식품의 모델에 대한 연구를 하여 항동맥경화물질을 함유한 건강기능성 시제품을 개발하였다. The anti-atherosclerotic substance originated from lettuce(Lactuca sativa L.) was extracted with MeOH and further partitioned by using EtOAc, n-BuOH and H_(2)O. The substance was determined as phytol by NMR and MS. The lettuce extract with anti-atherosclerotic activity was tested for processing characters such as heat and light stability. Food model was developed with the processing parameters of the lettuce extract. The extracts was finally processed as a functional food in a tablet form with other biologically active ingredients.
β-Cyclodextrin Reduces Obesity in C57BL/6J Mice Induced by High Fat Diet
Dae Won Kim,In Koo Hwang,Ki-Yeon Yoo,Hua Li,Tongkun Pai,Young Sup Kim,Dae Young Kwon,Dong-Woo Kim,Won-Kuk Moon,Moo-Ho Won 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.4
Anti-obesity effects of β-cyclodextrin in obese C57BL/6J mice induced by a high fat diet (HD) were observed. The administration of β-cyclodextrin reduced the gain of body weight, abdominal fat, liver weight, the lipid deposits of hepatocytes and the size of adipocytes in the HD group. In serum analysis, the total and low-density lipoprotein-cholesterols were significantly decreased in the β-cyclodextrin-supplemented HD group than in the HD group. However, high-density lipoprotein-cholesterol was not changed in these groups. In hypothalamic homogenates, the decrease of neuropeptide Y and increase of α-melanocyte stimulating hormone were detected in the β-cyclodextrin-supplemented HD group compared to that in the HD group. These effects of β-cyclodextrin were similar to those of Garcinia cambogia, which is widely used as a natural anti-obesity product. These results suggest that β-cyclodextrin has anti-obesity effects through the lowering of the abdominal fat pad and inhibits the central effects of hunger.