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A calculation of the neutron endurance for Al2O3/SS316L
Jung Kwan hui,Jeon Ok Sung,Lee Hak Ji,Ha Joohwan,진영구,Yang Hyun Seo,Yoo Young Joon,Lee Se Hun,Hong Dongpyo,Kim Dong min,Park Byung-Gun,Park Sang Yoon,Lee Sang-hwa 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.5
The structural materials of a test blanket module were exposed to neutron irradiation and hydrogen isotope permeation. A quantification of neutron irradiation damage of these materials is important to estimate the point defect rate, which traps hydrogen isotope. To evaluate the structural stability of the hydrogen isotope permeation barrier for international thermonuclear experimental reactor materials, neutron irradiation damage of Al2O3/ SS316L is required. An MC-50 cyclotron was used as a source for neutron irradiation during the neutron dose experiments. Beryllium (Be) was used as a target for the neutron generation by 9Be(p,n)9B reaction, and the neutron spectrum was calculated. The resultant dominant relative neutron fluxes were similar, with neutron energies of 2.45 and 14.1 MeV, which are given by D–D and D–T reaction from a nuclear fusion reactor. To quantify the extent of damage due to the neutron irradiation, the displacement per atom rate was calculated using the particle and heavy ion transport code system. The effect of the thickness of the Al2O3 layer on the neutron irradiation damage and on its radionuclides was also analyzed. The information on the reaction rate and the radionuclides for charged particles can be combined with a density functional theory analysis to explain the correlation between hydrogen isotope permeability and defects.
A Multicenter Study of Pertussis Infection in Adults with Coughing in Korea: PCR-Based Study
Sung Hoon Park,Myung Gu Lee,Kwan Ho Lee,Yong Bum Park,Kwang Ha Yoo,Jeong Woong Park,Chang Hwan Kim,Yong Chul Lee,Jae Seuk Park,Yong Soo Kwon,Ki Hyun Seo,Hui Jung Kim,Seung Min Kwak 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.73 No.5
Background: Limited data on the incidence and clinical characteristics of adult pertussis infections are available in Korea. Methods: Thirty-one hospitals and the Korean Centers for Disease Control and Prevention collaborated to investigate the incidence and clinical characteristics of pertussis infections among adults with a bothersome cough in non-outbreak, ordinary outpatient settings. Nasopharyngeal aspirates or nasopharyngeal swabs were collected for polymerase chain reaction (PCR) and culture tests. Results: The study enrolled 934 patients between September 2009 and April 2011. Five patients were diagnosed as confirmed cases, satisfying both clinical and laboratory criteria (five positive PCR and one concurrent positive culture). Among 607 patients with cough duration of at least 2 weeks, 504 satisfied the clinical criteria of the US Centers for Disease Control and Prevention (i.e., probable case). The clinical pertussis cases (i.e., both probable and confirmed cases) had a wide age distribution (45.7±15.5 years) and cough duration (median, 30 days; interquartile range, 18.0~50.0 days). In addition, sputum, rhinorrhea, and myalgia were less common and dyspnea was more common in the clinical cases, compared to the others (p=0.037, p=0.006, p=0.005, and p=0.030, respectively). Conclusion: The positive rate of pertussis infection may be low in non-outbreak, ordinary clinical settings if a PCR-based method is used. However, further prospective, well-designed, multicenter studies are needed.
Risk-Based Allocation of Demand Response Resources Using Conditional Value-at Risk (CVaR) Assessment
Ji-Hui Kim,Jaehee Lee,Sung-Kwan Joo 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.3
In a demand response (DR) market run by independent system operators (ISOs), load aggregators are important market participants who aggregate small retail customers through various DR programs. A load aggregator can minimize the allocation cost by efficiently allocating its demand response resources (DRRs) considering retail customers’ characteristics. However, the uncertain response behaviors of retail customers can influence the allocation strategy of its DRRs, increasing the economic risk of DRR allocation. This paper presents a risk-based DRR allocation method for the load aggregator that takes into account not only the physical characteristics of retail customers but also the risk due to the associated response uncertainties. In the paper, a conditional value-at-risk (CVaR) is applied to deal with the risk due to response uncertainties. Numerical results are presented to illustrate the effectiveness of the proposed method.
Seo, Sang Won,Lee, Jong-Min,Im, Kiho,Park, Jun-Sung,Kim, Sook-Hui,Kim, Sung Tae,Ahn, Joong Hyun,Kim, Min-Jeong,Kim, Geon Ha,Kim, Jong Hun,Roh, Jee Hoon,Cheong, Hae-Kwan,Na, Duk L. Lippincott WilliamsWilkins, Inc. 2012 Alzheimer disease and associated disorders Vol.26 No.2
Cardiovascular risk factors are associated with cognitive impairments. However, the effects of cardiovascular risk factors on the topography of cortical thinning have not yet been studied in patients with mild cognitive impairment (MCI) or dementia. Thus, we aimed to evaluate the topography of cortical thinning related to cardiovascular risk factors and the relationships among cardiovascular risk factors, white matter hyperintensities (WMH), and cortical atrophy. Participants included 226 patients with Alzheimer disease or subcortical vascular dementia and 135 patients with amnestic MCI or subcortical vascular MCI. We automatically measured the volume of WMH and cortical thickness. Hypertension was associated with cortical thinning in the frontal and perisylvian regions, and cortical thinning related to diabetes mellitus (DM) occurred in the frontal region. In path analyses, hypertension accounted for 0.04 of the frontal thinning with the mediation of WMH and 0.16 without the mediation of WMH. In case of DM, it accounted for 0.02 of the frontal thinning with the mediation of WMH and 0.13 without the mediation of WMH. Hypertension and DM predominantly affected frontal thinning both with and without the mediation of WMH, where the effects without the mediation of WMH were greater than those with the mediation of WMH.
수면다원검사를 시행한 환자들의 각성지수와 임상양상과의 관계
김성경 ( Sung Kyoung Kim ),이상학 ( Sang Haak Lee ),강현희 ( Hyeon Hui Kang ),강지영 ( Ji Young Kang ),김진우 ( Jin Woo Kim ),김영균 ( Young Kyoon Kim ),김관형 ( Kwan Hyoung Kim ),송정섭 ( Jeong Sup Song ),박성학 ( Sung Hak Par 대한결핵 및 호흡기학회 2009 Tuberculosis and Respiratory Diseases Vol.67 No.3
Background: Repeated arousals during sleep have been known to be associated with excessive daytime sleepiness and cardiovascular complications. We investigated the relationship between arousal indices and clinical parameters. Methods: We retrospectively reviewed medical records of 41 patients who performed polysomnography for a diagnosis of obstructive sleep apnea syndrome. We defined total arousal index (TAI) as the number of arousals per hour and respiratory arousal index (RAI) as the number of arousals associated with apnea or hypopnea per hour. Results: There were significant positive correlations between arousal indices and apnea-hypopnea index (AHI) (RAI vs. AHI, r=0.958, p<0.001; TAI vs. AHI, r=0.840, p<0.001). RAI and mean oxygen saturation showed a significant negative correlation with each other (r=-0.460, p=0.002). TAI revealed a significant positive correlation with mean systolic blood pressure (MSBP) and mean diastolic blood pressure (MDBP) (TAI vs. MSBP, r=0.389, p=0.014; TAI vs. MDBP, r=0.373, p=0.019). There was no significant correlation between arousal indices and parameters of sleepiness. RAI had a significant positive correlation with body mass index (BMI) and neck circumference (NC) (RAI vs. BMI, r=0.371, p=0.017; RAI vs. NC, r=0.444, p=0.004). When partial correlation analysis was performed to adjust for other variables, there was significant correlation between RAI and AHI (r=0.935, p<0.001). Conclusion: This study shows that respiratory arousal index could be a useful index reflecting of severity of obstructive sleep apnea syndrome. Arousal during sleep would be concerned in the development of cardiovascular complication of obstructive sleep apnea. And some anthropometric factors would contribute to the development of arousals during sleep. Further studies are needed to clarify any cause-effect relationship.
Ji-Hui Kim,Jaehee Lee,Sung-Kwan Joo Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>Superconducting fault current limiters (SFCLs), which are used to restrict the maximum fault current level in a power system, can contribute to the economic operation of a power system by reducing congestion costs and expected energy not served costs. However, various power system factors such as load and fuel price need to be taken into account because these factors result in an economic risk when SFCLs are installed in a power system. Therefore, it is needed to carry out an economic assessment of SFCLs considering both the expected benefit and the risk. This paper presents a risk-based economic assessment method for an SFCL installation under power system uncertainties. In the paper, the conditional value-at-risk (CVaR) is used to estimate the economic risk due to power system uncertainties when installing SFCLs. The proposed risk assessment method for SFCL installation can be useful as a decision-making tool.</P>