• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.94.5-94
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• 2001

Unrestricted measurement method of three-dimensional walking distance utilizing body acceleration and terrestrial magnetism is discussed. The three-dimensional walking distance is derived by the integration of the three dimensional acceleration of foot during swing phase. Since the sensor system attached on the foot rotates during swing phase, the acceleration data measured on the foot include acceleration of gravity which causes inaccurate calculation of the velocity and the distance. Three gyros are used to compensate the rotation of the sensor system. Moreover, one geomagnetic sensor is employed to derive the heading direction of the subject Healthy volunteers performed ...

• 대한임상약리학회:학술대회논문집
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• 1999.12a
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• pp.46-46
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• 1999

• 대한임상약리학회:학술대회논문집
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• 1996.12a
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• pp.36-36
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• 1996

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.162.1-162.1
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• 2003

The purpose of this study was to determine the possibility of sphingolipid as a diagnostic marker for Myocardiac Infarction(MI), atherosclerosis-related cardiovascular disease. Sphingolipids are known to playa role in the occurrence of atherosclerosis in human blood vessels. Platelet-poor plasma(PPP) and washed platelets were prepared from healthy volunteers and MI patients, and sphingolipids analyzed. (omitted)

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.227.2-227.2
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• 2003

In the situation of high bacterial resistance to antibiotics in Korea, to assess diffusion of methicillin-resistant Staphylococcus aureus (MRSA) and levels of bacterial resistance to antibiotics in community, we monitored antibiotic resistance of S. aureus isolates from healthy volunteers of community. (omitted)

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.309.1-309.1
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• 2003

The purposes of this study were to evaluate bioequivalence (BE) using In-transformed pharmacokinetic parameters obtained from two risperidone products and to develop the analytical methods for the quantitative determination of risperidone in human serum. In addition, the in vitro dissolution profiles of the two risperidone products in various dissolution media: pH 1.2, 4.0, 6.8 and water (KP VII Apparatus II method) were assesed. (omitted)

• Proceedings of the PSK Conference
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• 2003.10b
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• pp.246.1-246.1
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• 2003

Bioequivalence of two enalapril maleate tablets, formulation A and B, was evaluated according to the Korean Guidelines for Bioequivalence Test (KGBT 2001). Twenty healthy male volunteers (19∼27 years old) were randomly divided into two groups and a randomized 2x2 cross-over study was performed. Following oral administration of enalapril maleate tablets (20 mg dose), blood sample was taken at pre-determined time intervals and the concentrations of enalapril in plasma were determined using LC-MS. (omitted)

• Journal of the Korean Magnetic Resonance Society
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• v.22 no.4
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• pp.149-157
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• 2018

Diabetes is known to be one of common causes for several types of peripheral nerve damage. Diabetic neuropathy (DN) is a significant complication lowering the quality of life that can be frequently found in diabetes patients. In this study, the metabolomic characteristic of DN and Diabetes was investigated with NMR spectroscopy. The sera samples were collected from DN patients, Diabetes patients, and healthy volunteers. Based on the pair-wise comparison, three metabolites were found to be noticeable: glucose, obviously, was upregulated both in DN patients (DNP) and Diabetes. Citrate is also increased in both diseases. However, the dietary nutrient and biosynthesized metabolite from glucose, ascorbate, was elevated only in DNP, compared to healthy control. The multivariate model of OPLS-DA clearly showed the group separation between healthy control-DNP and healthy control-Diabetes. The most significant metabolites that contributed the group separation included glucose, citrate, ascorbate, and lactate. Lactate did not show the statistical significance of change in t-test while it tends to down-regulated both in DNP and Diabetes. We also conducted the ROC curve analysis to make a multivariate model for discrimination of healthy control and diseases with the identified three metabolites. As a result, the discrimination model between healthy control and DNP (or Diabetes) was successful while the model between DNP and Diabetes was not satisfactory for discrimination. In addition, multiple combinations of lactate and citrate in the OPLS-DA model of healthy control and diabetes group (DNP + Diabetes patients) gave good ROC value of 0.952, which imply these two metabolites could be used for diagnosis of Diabetes without glucose information.

• Korean Journal of Clinical Laboratory Science
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• v.41 no.1
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• pp.31-36
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• 2009

The exposure of human beings to toxic trace metals (Cu, Zn) continues to be an important public health issue and concern. This study was conducted to assess the exposure to trace metals (Cu, Zn) in the general Korean population by inductively coupled plasma mass spectrometry (ICP-MS) and Atomic absorption spectrometry (AAS). Serum samples were obtained from 40 healthy volunteers. Specimens were collected in special container and we applied sample processing to minimize contamination. We used ICP-MS and AAS to analyze simultaneously the concentration of metals including copper, zinc. Distribution of trace metal levels in the general healthy population showed lower values. The results in this study can provide background data for clinical studies associated with trace metal exposure in the korean population.

• Journal of Nutrition and Health
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• v.31 no.8
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• pp.1244-1253
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• 1998

This study investigated the effects of vitamin C supplementation on immune status in smoking and nonsmoking male college students. Blood samples were obtained from 15 healthy smoking and from 15 healthy nonsmoking volunteers before and 4 weeks after vitamin C supplementation (1000mg/day). Daily nutrient intakes was also calculated. Plasma vitamin C, E, and A concentrations, white blood cells and subpopulations, lymphocytes and subpopulations, NK cell percentage,plasma immunoglobulin A, G, M and complement C3, plasma interleukin-2 , and prostagladin E2 were measured . Daily vitamin C consumption was lower in smokers than in nonsmokers. Vitamin C supplementation significantly increased plasma vitamin C in smokers, and increased NK cell percentage in smokers and nonsmokers. Plasma IL-2 concentrations were significantly increased by vitamin C supplementation in nonsmokers, and decreased helpe $r^pressor T cell ratio were decreased by vitamin C supplementatiion , but the differences were not significant. White blood cells and subpopulation percentage and plasma prostaglandin E2 concentration were not affected by smoking and vitamin C supplementation. These findings as nonsmokers.rs.