• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.4 no.3
• /
• pp.223-229
• /
• 2003

Annual radiation dose of residential individuals near 4 nuclear power plants in Korea was calculated via K-DOSE 60 based on the updated ICRP-60. The critical exposure variables were chosen as radionuclides, exposed organs and intake pathways. From the calculation results, the critical nuclides were found to be $^3$H, $^{133}$ Xe, $^{60}$ Co for Kori plants and $^{14}$ C, $^{41}$ Ar for Wolsung plants. The most critical pathway was 'vegetable intake' for adults and 'milk intake' for infants. However, there was no preference in the effective organs. Sensitivity analyses showed that the chemical composition in a nuclide much more influenced upon the radiation dose than any other input parameters such as food intake, radiation discharge, and transfer/concentration coefficients by more than 10$^2$ factor. The effect of transfer/concentration coefficients on the radiation dose was negligible. All input parameters showed highly estimated correlation with the radiation dose, approxinated to 1.0.

• Journal of Distribution Research
• /
• v.12 no.4
• /
• pp.109-125
• /
• 2007

Even though private brands have low cost advantages to national brands, consumers perceive the qualities of private brands lower than the qualities of national brands. To overcome such perceptions of consumers, alliances between private brands and national brands should be tried. This study investigates the effects of consumers' attitude for private brands and national brands on the evaluation of brand alliance between private and national brands, especially when national brands are used as ingredient brands of the private brand. We also study the moderating effects of consumers' price sensitivity and quality sensitivity on this brand alliance evaluation. Additionally, we try to provide some guidelines for successful brand alliances between private and national brands.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.48 no.9
• /
• pp.13-21
• /
• 2011

In this paper, the CMOS programmable interface circuit for MEMS gyroscope is presented, and evaluated with the MEMS sensing element. The circuit includes the front-end charge amplifier with 10 bit programmable capacitor arrays, 9 bit DAC for accurate offset calibration, and 10 bit PGA for accurate gain calibration. The self oscillation loop with automatic gain control operates properly. The offset error and gain error after calibration are measured to be 0.36 %FSO and 0.19 %FSO, respectively. The noise equivalent resolution and bias instability are measured to be 0.016 deg/sec and 0.012 deg/sec, respectively. The calibration capability of this circuit can reduce the variations of the output offset and gain, and this can enhance the manufacturability and can improve the yield.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
• /
• v.12 no.1
• /
• pp.37-43
• /
• 2014

A parametric sensitivity to the annual exposure dose rate to the farming exposure group has been deterministically carried out for three principal elements identified in the near-field of the pyroprocessed waste repository system as a series study of Part 1 of the coupled paper with the same title. Credit time for both metal and ceramic containers, annual nuclide release rete and the degree of loss of bentonite buffer around the container are selected and investigated deterministically for important nuclides. To this end the A-KRS has been assessed and then compared among each other with the normal, the worst, and the best case scenarios associated with their extreme values these elements could have. All the elements are shown to be sensitive to the results as was in Part 1. Methodology studied through this study and the results are expected to make a good feedback to the repository design.

• Environmental Analysis Health and Toxicology
• /
• v.23 no.4
• /
• pp.337-343
• /
• 2008

따개비류는 암반기질에 무리를 이루어 비교적 단단히 부착생활을 하며 전 세계적으로 분포하는 생물이다. 본 생물은 형태가 다른 두 단계의 플랑크톤 유생시기를 거쳐 기질에 부착하여 생활한다. 따개비류에 관한 국내연구는 순수 분류학적으로 몇 편의 연구가 이루어졌을 뿐이며 실험실 내 사육조건 및 유생의 민감도 등에 관한 연구는 제대로 수행되어 있지 않은 실정이다. 본 연구에서는 첫 번째 단계 유생을 대상으로 몇몇 중금속(Cd, Cr, Cu 그리고 Zn)에 대한 민감도를 조사하였고 타 연구결과와의 비교로 생태 독성학적 적용을 시도하였다. 네 가지 금속물질, 카드뮴, 크롬, 구리 그리고 아연에 대한 따개비 유생의 반수사망농도는 각각 0.43, 24.4, 0.22 그리고 1.74mg/L로 산정되었다. 외국의 생물검정용 따개비와 본 연구에 사용된 고랑따개비의 민감도는 아주 유사하게 나타났다. 따라서 국내산 고랑따개비의 유생은 해양 환경 평가에 일반적으로 이용되는 해양생물과 동반 검정의 수행에 자격을 갖추었다고 할 수 있다. 본 연구의 결과는 해양환경의 평가는 물론 방오물질개발 등에의 기초자료를 제공할 수 있을 것으로 사료된다.

• The Journal of the Korea Contents Association
• /
• v.12 no.10
• /
• pp.385-394
• /
• 2012

The aim of this study was to determine the effectiveness of diagnostic range for BMD measurement tools(DEXA, QUS, and RA) to health examination in transitional ages. In standard T-score -2.5 of DEXA, cutoff value by RA is -1.675(sensitivity: 70.0%, specificity: 63.7%) and cutoff value by QUS is -1.733(sensitivity: 70.4, specificity: 59.5%), also T-score -3.0 of DEXA, cutoff value by RA is -2.325(sensitivity: 70.0%, specificity: 42.9%) and cutoff value by QUS is -2.323(sensitivity: 70.4, specificity: 56.8%). There was, however, no significant difference in standard DEXA(lumbar spine and femur) between RA and QUS by repeat measurement(precision), and correlation were without effect. ROC analysis showed that all methods are qualified for BMD measurement tools to health examination in transitional ages; however, the different sensitivities and specificities of the methods, as well as age and gender, calibration parameters for diagnostic tests have to be considered.

• Journal of the Korean Society of Urban Environment
• /
• v.18 no.4
• /
• pp.429-437
• /
• 2018

In this study, the mixed toxicity of heavy metals (Cu, Pb, Hg) and surfactants (SLS, ALS) was evaluated by using Vibrio fischeri and Daphnia magna. The sensitivity of ecotoxicity to heavy metals was sensitive to daphnia but the case of surfactants were more sensitive to Vibrio fischeri. Experimental results of Vibrio fischeri show that the toxicity value P(O) was lower than the predicted value P(E), and the antagonistic effect was observed when the heavy metal and the surfactant were mixed. It seems that SLS and ALS, which are anionic surfactants, have anionic form on the hydrophilic head, so that they have an antagonistic effect that they are bonded with heavy metal ion which is a cation type and the actual toxicity is lowered. In Daphnia magna, the results showed that antagonistic, additive and synergistic effects were in order as concentrations increased. As the concentration increases, Daphnia magna, which is highly sensitive to heavy metals, seems to have a synergistic effect with a rapid increase in mortality.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2004.06a
• /
• pp.52-57
• /
• 2004

In order to analyze key parameters of important radionuclides in dose evaluation model of decommissioning site, a sensitivity analysis was performed. This analysis assumed a resident farmer for an exposure scenario and 0.037Bq/g for the concentration of radionuclides. As a result of sensitivity analysis, the key parameters of radionuclides considered were the area of contaminated zone, external gamma shielding factor and indoor time fraction for Cs-137 and Co-60. The key parameters for C-14 were the environmental parameters and hydrological parameters of unsaturated zone. Also, the key parameter for Sr-90 was the density of contaminated zone.

• Therapeutic Science for Rehabilitation
• /
• v.7 no.1
• /
• pp.27-35
• /
• 2018

Objective : The aim of this study was to identify correlation between KF-NAP and Pencil-Paper test(Line bisection test, Letter cancellation, Albert's test) and to determine the high sensitive assessment tool for spatial neglect. Method : Thirty-two stroke patients who admitted to an inpatient rehabilitation unit at the medical center in Seoul from September, 2014 to September, 2015 were included in our research. They all have spatial neglect (male=19, female=13, the average age 61.8). KF-NAP and Pencil-Paper test were performed within 7 days. The detection of spatial neglect was analyzed by total scores of each assessments. Results : The highest sensitivity assessments of spatial neglect was KF-NAP. The detection of spatial neglect through KF-NAP was 93.8% (Line bisection test 53.1, Letter cancellation 53.1%, Albert's test 37.5%). Line bisection test (r=.430), Letter cancellation(r=.641), Albert's test(r=.398) and KF-NAP scores had significant correlation(p<0.05). Conclusion : KF-NAP is higher sensitive in comparison with Pencil-Paper test for detection of spatial neglect as the assessment tool of spatial neglect during activities daily livings of patients and neglect severity could be assessed with KF-NAP. Therefore, KF-NAP is recommended for assessment of spatial neglect.

• 한국방재학회:학술대회논문집
• /
• 2007.02a
• /
• pp.113-116
• /
• 2007

This is a research for evaluated recycled glass powder to add asphalt concrete filler. To make a comparative study, Mechanical performance of lime stone and slag dust Mixtures was evaluated according to test procedure. Lab. performance tests included marshall stability, indirect tensile strength, resilient modulus and wheel tracking. Water resistance tests were evaluated by marshall strength ratio and tensile strength ratio. In conclusion, Results of mechanical performance showed that recycled glass powder mixtures were equivalent to conventional mixtures. Especially, result of tensile strength ratio tested recycled glass powder mixtures was superior to conventional mixtures.