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Sim Hayoung,Seo Hee,Choi Hyeonjun,Kim Haneul,Jang Jaeho,Lee Jaekook 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.6
At domestic ports and airports, radiation portal monitors (RPMs) have been installed and operated for detection of illegal radioactive materials in cargo containers. In RPM operation, however, false alarms occasionally sound due to naturally occurring radioactive materials. The alarm criterion is set based on the background count rate, which is a site-specific variable; therefore, optimization of the site-specific alarm criterion in consideration of site- and RPM-specific characteristics is essential for efficient operation of any RPM system. To this end, repetitive testing for various source conditions is required; such tests, however, are difficult to conduct, due to the 24/7 operation of airports and ports with their RPMs. Alternatively, Monte Carlo simulation could be the best option for RPM performance evaluation under various conditions for optimization of site-specific alarm criteria. In the present study, we employed iterative Monte Carlo simulations to precisely model a commercial RPM, based on which we were able to determine realistic gain and energy resolution parameters for a polyvinyl toluene (PVT)-based RPM. Background radiation contributing to RPM signals originated mainly from radioisotopes of the 238U and 232Th series as well as 40K in the soil near where the RPM was installed; therefore, the corresponding nuclide activity ratios were determined by a high-purity germanium (HPGe) detector based on the measured energy spectrum, and were then applied to the background simulation model. The simulated background spectrum showed good agreement with the RPMmeasured experimental data. Additionally, to improve calculation efficiency, two methods using a simple box enclosure and surface source were evaluated, and the results showed an approximately 370-times improvement in computation time. The developed realistic Monte Carlo-based background model will contribute to developing site-specific RPM alarm criteria.
( Hayoung Choi ),( Yun Su Sim ),( Tae Rim Shin ),( Dong-gyu Kim ),( Dong Won Park ),( Tai Sun Park ),( Ji-yong Moon ),( Sang-heon Kim ),( Tae-hyung Kim ),( Jang Won Sohn ),( Ho Joo Yoon ),( Hyun Lee ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: The characteristics of bronchiectasis and its clinical implications in patients with previous pulmonary tuberculosis have not been well elucidated using a nationally representative database. Methods: We compared respiratory symptoms, comorbidities, lung function, quality of life, and socioeconomic status in post-tuberculosis subjects with bronchiectasis versus those without bronchiectasis participating in the Korean National Health and Nutritional Examination Survey 2007-2009. Results: The prevalence of bronchiectasis was 2.6% (n = 35) in the 1,352 subjects with previous pulmonary tuberculosis. Bronchiectasis subjects showed lower body mass index (BMI) (21.9 vs. 23.4 kg/m2, P = 0.002) and higher asthma rate (26.8% vs. 4.5%, P < 0.001) compared with those without bronchiectasis. There were no significant intergroup differences in age, lung function, respiratory symptoms, family income, and education. However, compared with subjects without bronchiectasis, bronchiectasis subjects showed lower EuroQoL five dimensions (EQ-5D) index (0.86 vs. 0.93, P = 0.010), which denotes the poor quality of life. Among EQ-5D components, there was a significant difference in the anxiety/depression component (38.5 vs. 12.1, P = 0.002) between two groups. Bronchiectasis subjects were associated with lower EQ-5D index (difference = 0.077, 95% confidence interval: 0.002-0.151), as compared with those without bronchiectasis, using multivariable linear regression with adjustment for demographic characteristics, BMI, education, and family income. Conclusion: The prevalence of bronchiectasis was 2.6% in the subjects with previous pulmonary tuberculosis. Post-tuberculosis subjects with bronchiectasis had higher asthma rate and reduced quality of life than those without bronchiectasis.
( Hayoung Choi ),( Hyun Lee ),( Yeon-mok Oh ),( Sei Won Lee ),( Yun Su Sim ),( Dong-gyu Kim ),( Hyun Kuk Kim ),( Jae Ha Lee ),( Seung Won Ra ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: Although respiratory infections, including tuberculosis, are the major cause of bronchiectasis in Asia, there is limited information on the clinical features of bronchiectasis patients with pulmonary tuberculosis (TB) history. Methods: We evaluated 436 bronchiectasis patients enrolled in the Korean Multicenter Bronchiectasis Audit and Research Collaboration (KMBARC) registry between August 2018 and July 2019. We compared respiratory symptoms, comorbidities, lung function, radiologic features, quality of life, exacerbations, and disease severity in bronchiectasis patients with TB history versus those without TB history. Results: Of the patients, 139 (31.9%) had TB history (51.8% [72/139] of whom was diagnosed with post-TB bronchiectasis). Bronchiectasis patients with TB history had lower body mass index (BMI) (22.4 vs. 23.2 kg/m2, P=0.002) and a higher rate of chronic obstructive pulmonary disease (COPD) (48.2% vs. 33.7%, P=0.004) than those without TB history. There were no significant intergroup differences in sputum color and volume, quality of life measured by the bronchiectasis health questionnaire, and other comorbidities. The involvement of right upper lobe (57.9% vs. 35.6%, P<0.001) and left upper lobe upper division (48.8% vs. 32.7%, P=0.002) on chest CT were more observed in patients with TB history than those without TB history. Regarding respiratory medications, bronchiectasis patients with TB history used LAMA/LABA more frequently (35.5% vs. 21.1%, P=0.001) and ICS/LABA less frequently (8.7% vs. 20.4%, P=0.002) than those without TB history. Bronchiectasis severity index (6 vs. 5, P=0.038) was significantly higher in patients with TB history than in those without TB history; however, there were no significant differences in exacerbations between two groups. Conclusion: Bronchiectasis patients with TB history had lower BMI, higher COPD rate, and received LAMA/ LABA more frequently than those without TB history. Despite higher bronchiectasis severity index in patients with TB history, there was no significant intergroup difference in the quality of life and exacerbation rates.
QTNAAS: 템플릿 기반 양자화된 신경망 구조 및 가속기 탐색 프레임워크
임하영(HaYoung Lim),김경미(Kyungmi Kim),장예서(Yeseo Jang),김주연(Juyeon Kim),심재형(Jaehyeong Sim) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
This work presents QTNAAS, a quantized template-based neural architecture accelerator search framework. Each neural operator with various quantization levels is paired with the optimal hardware block that executes the operator efficiently. We call this pair a quantized template. This approach reduces both the search space and time consumed for performance estimation, hence make it highly probable to find optimal neural architecture. This found neural architecture is bind with hardware through templates, sustaining 100% utilization. Evaluation results show that our method can build a neural network with comparable accuracy even employing mixed-precision and an accelerator with lower latency and energy consumption compared to the existing works.
Impacts of Asthma in Patients With Bronchiectasis: Findings From the KMBARC Registry
Moon Seong Mi,Choi Hayoung,Kang Hyung Koo,Lee Sei Won,Sim Yun Su,Park Hye Yun,Kwon Yong-Soo,Kim Sang-Heon,Oh Yeon-Mok,Lee Hyun 대한천식알레르기학회 2023 Allergy, Asthma & Immunology Research Vol.15 No.1
Purpose: Although the coexistence of asthma and bronchiectasis is common, the impacts of asthma on bronchiectastic patients (BE) have not been well evaluated because this issue using bronchiectasis cohorts has been investigated in only a few studies. Methods: In the present study, 598 patients who were prospectively enrolled in the Korean bronchiectasis registry were evaluated. The clinical characteristics between BE with asthma and those without asthma were compared. Results: Asthma was found in 22.4% of BE. BE with asthma had a higher body mass index (BMI) (P = 0.020), more dyspnea (P < 0.001), larger sputum volume (P = 0.015), and lower forced expiratory volume in 1 second (FEV1) (P < 0.001) than those without asthma. BE with asthma had a higher rate of previous pneumonia (P = 0.017) or measles (P = 0.037) than those without asthma. Regarding treatment, BE with asthma used inhaled corticosteroids, long-acting muscarinic antagonists, and leukotriene receptor antagonists more frequently than those without asthma. Although intergroup differences were not observed in disease severity of bronchiectasis (P = 0.230 for Bronchiectasis Severity Index and P = 0.089 for FACED), the Bronchiectasis Health Questionnaire (BHQ) scores indicating the quality of life, were significantly lower in BE with asthma than in those without asthma (61.6 vs. 64.8, P < 0.001). In a multivariable model adjusting for age, sex, body mass index, forced expiratory volume in 1 second %predicted, sputum volume, modified Medical Research Council dyspnea scale ≥ 2, and the number of involved lobes, asthma was associated with lower BHQ scores (β-coefficient = −2.579, P = 0.014). Conclusions: BE with asthma have more respiratory symptoms, worse lung function, and poorer quality of life than those without asthma. A better understanding of the impacts of asthma in BE will guide appropriate management in this population.
Epidemiology and Clinical Features of Common Community Human Coronavirus Disease Before COVID-19
( Taehee Kim ),( Yun Su Sim ),( Hayoung Choi ),( Tae Rim Shin ),( Yousang Ko ),( Yong Bum Park ),( Hwan Il Kim ),( Seung Hun Jang ),( Ki Suck Jung ),( Youlim Kim ),( Myung Goo Lee ),( Soojie Chung ),( 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Backgrounds We would improve the understanding and management preparation of human coronavirus (HCoV) disease by analyzing the epidemiology, clinical aspects, and prognostic factors of patients of all ages who were recently hospitalized with coronavirus. Methods This study was retrospectively performed at five university teaching hospitals between 1 January 2018 and 31 March 2020. Routine molecular testing using for multiplex real-time reverse transcription-polymerase chain reaction Methods was conducted on the respiratory viruses. We assessed the demographics, laboratory findings, and treatment of patients infected with coronavirus. Results There were 807 coronavirus-infected patients admitted to five hospitals for 27 months and 553 (69%) of them were <10 years age. All-cause mortality rates of patients admitted for seasonal HCoV disease were 3.1% in all patients, and 10.8% in patients aged ≥ 18 years. The Cox proportional hazard regression analysis was performed in patients aged ≥ 18 years. After adjusting for other clinical variables, general weakness symptoms (hazard ratio [HR], 2.65; 95% confidence interval [CI], 1.14-6.13, P = 0.023) , National Early Waring Score (NEWS) ≥2 (HR, 6.00; 95% CI, 1.40-25.81, P = 0.016), and coronavirus subtype OC43 (HR, 2.82; 95% CI, 1.21-6.58, P = 0.016) were significantly associated with death from coronavirus. Conclusions Coronavirus infection can reveal a higher mortality rate in patients of ≥18 years than those of <18 years, thus, adult patients require more careful treatment. Furthermore, in adult patients, the factors associated with death from coronavirus include general weakness symptoms, NEWS higher than 2, and OC43 subtype.