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Thyroid cancer among female workers in Korea, 2007–2015
Seonghoon Kang,Jinho Song,Taehwan Koh,One Park,Jong-Tae Park,Won-Jin Lee 대한직업환경의학회 2018 대한직업환경의학회지 Vol.30 No.-
Background: Prevalence of thyroid cancer has been increasing rapidly worldwide, especially among women. There has been a debate as to whether such an increase represents consequences of over-diagnosis or a true increase. To find the occupational risk of Korean female workers in different industry sectors, we analyzed the data of Korean female workers. Methods: National Female Worker Cohort data that contain information on total female workers were used for our analysis of prevalence of thyroid cancer (C73 according to KCD-5, 6 code) derived from National Health Insurance data. By combining industrial codes from National Health Insurance Service and those from Korea Workers’ Compensation and Welfare Service, the classification of industrial codes became to consist of the total of thirty three representing both non-office (NO) and office (O) categories. Both an internal comparison among female workers within the cohort and an external comparison to compare female workers with Korean general female population were carried out. Results: Among 149,258 female workers, 2,641 cases of thyroid cancers were identified. Differences in prevalence of thyroid cancer between female workers (40.5%) and general Korean female population (32.6%) were observed; however, the differences in prevalence of thyroid cancer between NO workers and O workers were not apparent. An analysis involving workers in Financial and insurance activities sector revealed that, standardized prevalence rate (SPR) of both NO (2.96, 95% CI = 2.01.4.20) and O workers (3.68, 95% CI = 3.10.4.33) increased significantly and that an AOR (adjusted odds ratio) increased marginally (1.38, 95% CI = 0.97.1.96). Further, when stratified in respect to the duration of employment, an AOR of female workers having been employed for more than 8 years showed a significant increase (1.63, 95% CI = 1.07.2.49). Conclusions: Female workers had a higher risk of thyroid cancer than general female population but the difference between NO workers and O workers was not found to be significant in most industrial sectors. Further studies using data with information regarding specific occupational exposures are needed.
NANOCAD Framework for Simulation of Quantum Effects in Nanoscale MOSFET Devices
Seonghoon Jin,Chan Hyeong Park,In-Young Chuug,Young June Park,Hong Shick Min 대한전자공학회 2006 Journal of semiconductor technology and science Vol.6 No.1
We introduce our in-house program, NANOCAD, for the modeling and simulation of carrier transport in nanoscale MOSFET devices including quantum-mechanical effects, which implements two kinds of modeling approaches: the top-down approach based on the macroscopic quantum correction model and the bottom-up approach based on the microscopic non-equilibrium Green’s function formalism. We briefly review these two approaches and show their applications to the nanoscale bulk MOSFET device and silicon nanowire transistor, respectively.
Park, Myungjoon,Park, Junsik,Choi, Joungcheul,Kim, Jinwoo,Jeong, Seonghoon,Seung, Manho,Lee, Seokkiu,Kim, Jingook [Institute of Electrical and Electronics Engineers 2019 IEEE transactions on electromagnetic compatibility Vol.61 No.1
<P>Voltage noise and operation errors in an integrated circuit (IC) due to electrostatic discharge (ESD) events were measured, validated, and analyzed in this paper. A simplified structure of a laptop personal computer and an IC with a D-type flip-flop were designed and manufactured for the experimental tests. Every signal input to the IC was simultaneously measured during the ESD tests, and validated with the simulated results using a full-wave solver and a simple circuit model. Next, SPICE simulations were conducted using the measured voltages with ESD tests. The output waveforms and the statistical occurrence ratios of the operation failures found from the SPICE simulations were compared with measured values. Furthermore, the effects of decoupling capacitors on the IC operation failures due to ESD were investigated.</P>
Seonghoon Jeong,Gitae Park,Bongyoon Kim,Joonoh Moon,Seong‑Jun Park,Changhee Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
This study investigates the relationship between the mechanical characteristics and microstructural transitions in heat-affectedzone (HAZ) of various austenitic Fe–Mn–Al–C lightweight steels. The analysis was conducted on the simulated HAZ sampleswith various post-weld heat treatment (PWHT) conditions. The base steel was prepared via vacuum induction melting, hotrolling, and solution treatment prior to water quenching. Gleeble simulator was used to manufacture the simulated HAZs, andthe samples were subjected to PWHT with various durations by electric furnace. To understand the effects of thermal historyon the mechanical characteristics, ultimate tensile tests, micro-hardness tests, and cryogenic Charpy impact toughness testswere conducted, and microstructural analyses were conducted by optical microscopy, scanning electron microscopy, X-raydiffraction analysis, and transmission electron microscopy. The experimental results confirmed the influence of Al contenton the austenitic Fe–Mn–Al–C lightweight steels, which promotes κ-carbide precipitation, both in the austenite matrix andgrain boundaries, thereby increasing the strength and hardness while decreasing the ductility and toughness. Each mechanicalproperty showed a linear relationship with the growth kinetics of the κ-carbide particles. However, abnormal coarsening ofthe inter-granular κ-carbide during welding and PWHT caused severe embrittlement, regardless of thermal history, by actingas inter-granular crack propagation channels. The experimental results suggest that Fe–Mn–Al–C lightweight steels shouldbe developed with controlling the alloying elements to overcome HAZ discontinuity and mechanical property degradationoccurring by intra- and inter-granular κ-carbide precipitation.
Thyroid cancer among female workers in Korea, 2007–2015
Kang, Seonghoon,Song, Jinho,Koh, Taehwan,Park, One,Park, Jong-Tae,Lee, Won-Jin Springer Nature 2018 Annals of occupational and environmental medicine Vol.30 No.1
<P><B>Background</B></P><P>Prevalence of thyroid cancer has been increasing rapidly worldwide, especially among women. There has been a debate as to whether such an increase represents consequences of over-diagnosis or a true increase. To find the occupational risk of Korean female workers in different industry sectors, we analyzed the data of Korean female workers.</P><P><B>Methods</B></P><P>National Female Worker Cohort data that contain information on total female workers were used for our analysis of prevalence of thyroid cancer (C73 according to KCD-5, 6 code) derived from National Health Insurance data. By combining industrial codes from National Health Insurance Service and those from Korea Workers’ Compensation and Welfare Service, the classification of industrial codes became to consist of the total of thirty three representing both non-office (NO) and office (O) categories. Both an internal comparison among female workers within the cohort and an external comparison to compare female workers with Korean general female population were carried out.</P><P><B>Results</B></P><P>Among 149,258 female workers, 2,641 cases of thyroid cancers were identified. Differences in prevalence of thyroid cancer between female workers (40.5%) and general Korean female population (32.6%) were observed; however, the differences in prevalence of thyroid cancer between NO workers and O workers were not apparent. An analysis involving workers in Financial and insurance activities sector revealed that, standardized prevalence rate (SPR) of both NO (2.96, 95% CI = 2.01–4.20) and O workers (3.68, 95% CI = 3.10–4.33) increased significantly and that an AOR (adjusted odds ratio) increased marginally (1.38, 95% CI = 0.97–1.96). Further, when stratified in respect to the duration of employment, an AOR of female workers having been employed for more than 8 years showed a significant increase (1.63, 95% CI = 1.07–2.49).</P><P><B>Conclusions</B></P><P>Female workers had a higher risk of thyroid cancer than general female population but the difference between NO workers and O workers was not found to be significant in most industrial sectors. Further studies using data with information regarding specific occupational exposures are needed.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1186/s40557-018-0259-3) contains supplementary material, which is available to authorized users.</P>