• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11b
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• pp.886-889
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• 2002

In order to evaluate absorption coefficient, experimental works for normal and random incident absorption coefficient are made. An investigation for correlation between normal and random incident absorption was carried out by experiment and analysis. It appears that at the low frequencies, the random incident absorption is higher than the normal one, whileas at the high frequencies, the random incident absorption is decreased due to the effect of grazing incident components.

• Journal of Preventive Medicine and Public Health
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• v.42 no.4
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• pp.261-266
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• 2009

Objectives : The aim of this study is to examine the cognitive function change related to aging, the incidence of cognitive impairment, and the association between apolipoprotein E polymorphism and cognitive impairment through a follow-up of the elderly with normal cognitive ability at baseline. Methods : Two hundred and fifteen subjects aged 65 and over were surveyed in February, 1998 (baseline survey), and their cognitive function was assessed again in 2003 1st follow-up) and the once again in 2006 (2nd follow-up). Ninety one subjects completed all surveys up through the 2nd follow-up and their cognitive function scores using MMSE-K (Korean Version of the Mini-Mental State Examination) and the distribution of apolipoprotein E allele were analyzed. Results : The cognitive function scores decreased with aging and the difference between baseline and the 2nd follow-up scores of the study increased with the age group. The incidence rate of cognitive impairment through an 8-year follow-up was 38.5% and higher in older age groups. Age was the only significant factor for incidence of cognitive impairment, but there was no significant association between apolipoprotein E genotype and incidence of cognitive impairment. Conclusions : The cognition of the elderly decreased with aging and the association of apolipoprotein E genotype with incidence of cognitive impairment was not significant in this study. To confirm the association between apolipoprotein E polymorphism and incidence of cognitive impairment further studies will be needed.

• Journal of Preventive Medicine and Public Health
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• v.30 no.2 s.57
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• pp.267-278
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• 1997

The purpose of this study was to investigate the incidence rate of hepatitis B in the military service and to examine the effect of the asymptomatic hepatitis B surface antigen(HBsAG) carries on the incidence of hepatitis B. The subject were 223,270 men who were conscripted to the Korean Army from 1991 to 1994. According to the conscripted year, four conscription cohort were constructed. At the screening examination for military service no test for hepatitis B were performed in 1991 and 1992. In 1993, a screening test for hepatitis B were performed and those who were confirmed as HBsAg positive o. showed high titers $(\geqq100IU)$ of nm glutamic-pyruvic transaminase(SGPT) were excluded from conscription. In 1994, the criteria for conscription was changed and those who were HBsAg positive were not excluded from conscription. Only those who showed $\geq$ SGPT 100IU were excluded. The main results were as follows ; 1. The positive rate of HBsAg is 5.5% in the conscripted men. 2. The incidence rates of the hepatitis B in 1991 and 1992 conscription cohort were 9.96 and 8.10 per ten thousand person-year, respectively. The incidence rate of the hepatitis B was 1.34 per ten thousand person-year in 1993 conscription cohort which was confirmed as HBsAg negative at the screning test, and 7.41 per ten thousand person-year in 1994 conscription cohort which included the HBsAg positive. 3. The incidence rate of hepatitis B was 99.98 per ten thousand person-year in HBsAg positive group and 2.25 per ten thousand person-year in HBsAg negative group. The incidence rate of the group with high SGPT and HBsAg positive was 255 times higher than that of normal population. 4. The incidence of hepatitis B in HBsAg negative group did not increase even though the probability of personal contact with HBsAg positive had been increased. from the above results, the men who have high SGPT with HBsAg positive should be excluded from military service, and it can not be said that asymptomatic HBsAg carriers influence on the hepatitis B incidence among the HBsAg negative through personal contact.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.15 no.4
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• pp.449-456
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• 2008

Purpose: The purpose of this study was to compare the effects of meatal care with 10% betadine or with normal saline on the incidence of urinary tract infection (UTI) for elderly patients with indwelling urinary catheter in the ICU. Method: A quasi experimental design with non-equivalent control group was used. The 37 patients who participated in this study were 65-year-old or older. Patients in the saline group (n=20) received meatal care with normal saline and those in the betadine group (n=17) received meatal care with 10% betadine once a day for 6 days. Urine cultures were done on the 7th day for both groups to detect UTIs. Results: No difference was observed in the incidence of urinary tract infection between the two groups, regardless of patients' gender, ability to communicate or history of operation. Conclusion: The results indicated that use of saline which is cheap and does not irritate the mucous membrane is effective in preventing UTI within the first 7 days, and can be used instead of betadine for meatal care for elderly patients with indwelling urinary catheter in the ICU.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.18 no.6
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• pp.598-605
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• 2008

An improved beamforming method is proposed to measure the surface impedance of absorbing materials in a free field. It is possible to estimate the surface impedance by decomposing measured signals into incident and reflected signals by using the spatial filter matrix of the beamforming method. Wavelet do-noising techniques which reduce the white Gaussian noise are applied to improve the results. Phase calibration method is also used to improve the results of the measured surface impedance in a low frequency range. The results of the normal incidence experiments that are performed in a semi-anechoic chamber are verified by comparing with those of the standard test method that is presented in ASTM E1050. The proposed method is found to be reliable to measure the surface impedance for frequencies higher than 400 Hz.

• Journal of the Korean Vacuum Society
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• v.12 no.S1
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• pp.92-94
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• 2003

The sputtering yield change of an amorphous Si layer on Si(100) was measured quantitatively for 0.5 keV $O_2^{+}$ and $Ar^{+}$ ion bombardment with in suit MEIS. In the case of 0.5 keV $O_2^{+}$ ion bombardment, at the initial stage of sputtering before surface oxidation, the sputtering yield of Si was 1.4 (Si atoms/$O_2^{+}$) and then decreased down to 0.06 at the ion dose of $3\times10^{16}O_2\;^{+}\textrm{/cm}^2$. In the case of 0.5 keV $Ar^{+}$ ion bombardment, the sputtering yield of Si for the surface normal incidence was 0.56 at the ion dose of 2.5 ${\times}$ 10$^{15}$ $Ar^{+}\textrm{cm}^2$, and rapidly saturated to 1.2 at dose of $7.5\times10^{15}Ar^+\textrm{cm}^2$. For the incidence angle of 80 from surface normal, the sputtering yield of Si was saturated to about 1.4 at the initial stage of sputtering. The surface transient effects, caused by change in sputtering yield at the initial stage of sputtering can be negligible when 0.5 keV $Ar^{+}$ ion at extremely grazing angle was used for sputter depth profiling.g.

• Journal of Haehwa Medicine
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• v.21 no.2
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• pp.127-132
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• 2013

Background: Nowadays, increasing women's socio-economic activities increased the grandmothers raising grandchildren. Because of the contemporary situation, the health problems of the care giving grandparents is becoming an issue. Purpose: The purpose of this study was to examine correlationship between the incidence of stroke and raising grandchildren. Methode: This article contrasts the ratio of recent experience of raising grandchildren of 195 normal and 323 stroke patients, especially women. Result: There were 43.08% of women raising their grandchildren in the normal group while 13.31% of women of stroke patients group were raising their grandchildren before the onset of stroke. Conclusion: The finding suggests the positive effect of raising grandchildren on reducing the risk for stroke.

• Journal of Korean Academy of Nursing
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• v.26 no.2
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• pp.428-442
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• 1996

Stomatitis is a common toxicity associated with the administration of certain cancer chemotherapeutic agents used in the treatment of malignant tumors. It represents one of the most distressing side effects of cancer chemotherapy and can interfere with the patient's ability to eat, be the cause of much pain and discomfort, and require the use of potent analgesics. The situation also creates favorable conditions for local infection which may lead to septicemia. Several authors have identified the need to establish protocols for the control and treatment of the oral discomfort associated with oral mucositis as a result of chemotherapy. Thus this study attempted to development of oral care protocol for chemotherapy patients. The effects of the mouth care using sterile normal saline, nystatine solution on oral stomatitis were investigated in 30 patients on chemotherapy. The subsect were divided into three groups : control group : not gargling experimental group A : normal saline gargling (4 times a day) experimental group B : nystatine solution gargling(4 times a day) The Oral Assessment Guide (OAG) was used to assess oral status three times(once in the prechemotherapy period, on 5th, 10th day of post chemotherapy) Oral culture was used to assess oral infection on 5th day of postchemotherapy. Data was analyzed on SAS program which used repeated ANOVA, t-test, X/sup²test. The results are as follows : 1. The incidence of stomatitis was higher in the control group and experimental group A than in experimental group B.（X/sup²＝0.002 P＝0.001）. The grade of stomatitis(mean of total score) for patients in the experimental group B were significantly lower than in the experimental group A F＝1.96 P＝0.0024）. In incidence of tongue change, control group, experimental group B were significantly higher than experimental group B（F＝6.84 P＝0.0039）. In control group and experimental group A. oral infection due to pathogenic bacteria were identified. In conclusion, mouth care with nystatine solution four times a day could reduce the incidence of stomatitis and secondary oral infection due to stomatitis. Thus active mouth care protocol which used to nystatine solution gargling need to prevention of stomatitis in chemotherapy patients.

• The Korean Journal of Applied Statistics
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• v.21 no.6
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• pp.901-910
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• 2008

Incidence of Plasmodium vivax malaria in South Korea have been reemerged from mid-1990 and infected around 1600 patients annually recent years. The authors calculated the distribution of malaria infection and prevalence in South Korea using incidence (2001-2006) and incubation period distributions by a back-calculation formula and the least squares estimation method. The estimated infection has a normal distribution with a mean 207 and a standard deviation 30.7 days. In addition, the authors found the estimated daily average prevalence is 628.8 patients.

• Journal of the Optical Society of Korea
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• v.19 no.6
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• pp.566-574
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• 2015

We report for the first time highly efficient trans-reflective color filters capable of demonstrating coloration in both transmission and reflection modes by taking advantage of a multilayer stack consisting of MgF₂ and TiO₂ used respectively as the low and high index materials. In order to enable such trans-reflective performance, securing an optimal stop band assuming an appropriate bandwidth within the visible regime is pivotal, which was realized by tailoring the thicknesses and the numbers of TiO₂-MgF₂ bi-layers. Three devices were designed through rigorous simulations and developed via e-beam evaporation to demonstrate vivid blue, green, and red colors in the reflection mode, and yellow, magenta, and cyan colors in the transmission mode, featuring an enhanced efficiency exceeding 90% under normal incidence. The color performance of the filters was examined by referring to the chromaticity coordinates of the transmission and reflection spectra, alongside photographed color images. The dependence of the performance on the angle of incidence was explored with respect to incident polarization, indicating that a transmission surpassing 60% could be stably maintained up to an angle of 75°. Polarization independent transfer characteristics were especially achieved for the normal incidence. The proposed devices may be readily extended to other spectral regimes by adjusting the thicknesses of the films.