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지역사회에서 형성된 사회적 지지와 근로자의 사회심리적 스트레스간의 관련성
임화영,김형수,최영환,장성훈,이건세,정최경희,오원기,최재욱,정춘화 대한산업의학회 2006 대한직업환경의학회지 Vol.18 No.4
Objective: This study was performed to examine the relationship between community-based social support and psychosocial distress in workers. Methods: The study subjects were 596 workers recruited from 11 companies in Chungju city. A structured questionnaire was used to assess sociodemographics, health-related behaviors, job characteristics, job stress, work-based social support, community-based social support and level of psychosocial distress. Results: Hierarchical multiple regression analysis showed that workers with no chronic disease, exercise and sufficient sleep had a higher score of psychosocial distress than those with chronic disease, no exercise, and not enough sleep. Coworker's work-based social support and community-based social support were negatively associated with psychosocial distress. The R square value of total independent variables on psychosocial distress was 0.409, and that of community-based social support on psychosocial distress was 0.052. Conclusion: This study showed that community-based social support served as a protective factor against psychosocial distress in some workers. We recommend the establishment of a worksite stress reduction program in occupational level as well as community-based social support.
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( Kyunghee Lim ),( Jin-oh Choi1 ) 대한내과학회 2016 대한내과학회 추계학술발표논문집 Vol.2016 No.1
Background: Heart failure (HF) is highly prevalent in patients with chronic kidney disease (CKD). Among the CKD patients initiating hemodialysis, left ventricular (LV) systolic dysfunction was reported up to 15 %. The aim of this study was to evaluate value of echocardiography to determine adverse cardiac outcomes in CKD patients with heart failure with reduced ejection fraction (HFrEF). Methods: In this retrospective study, we surveyed 843 patients with both advanced CKD and HF who were starting hemodialysis in our hospital during the period 2005 - 2015. HFrEF was defined by LVEF ≤ 50 % with symptoms of HF. We inspected echocardiography, comorbidity, medication, laboratory findings in 94 patients with advanced CKD and HFrEF. The primary endpoint was comparison of echocardiographic parameters between hospitalization group and non-hospitaliztion group and secondary endpoints was all cause mortality in between two group. Results: 40 (42 %) patients were hospitalized caused by HF, and 18 (19.1 %) patients were deceased. Before initiation of hemodialysis, LV end-systolic (LVIDs) and end-diastolic diameter (LVIDd) were higher in patients with experience of hospitalization due to HF than patients without hospitalization (LVIDd: 60.5±8.14 mm vs 56.5±7.16, p=0.016) (LVIDs: 46.5±9.2 vs 41.7±8.0, p=0.01). Also There was a difference in relative wall thickness (RWT) between the two groups (0.334±0.073 vs 0.365±0.077, p=0.047) The 4.3-year survival rates of two group were 93.2% and 56.4 respectively by the Kaplan-Meier survival estimation (p=0.005). Conclusions: In CKD with HFrEF, LVIDs, LVIDd and RWT were strong predictors for adverse cardiac outcomes. Identification and measurement of LVIDs, LVIDd, RWT significantly improve risk stratification in high risk population
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A Study on Learning to Write English Interrogative Sentences
Choi, Kyunghee The English Teachers Association in Korea 2012 영어어문교육 Vol.18 No.2
This paper aims to discuss the effects of learning how to write English interrogative sentences. 122 students who participated in the study learned basic structural components of English questions and practiced writing questions by inversing the subject and the verb in a given declarative sentence. The participants were divided into two groups: Group 1 which was given a brief explanation of interrogative structures and practices, and Group 2 which was given the same explanation and practices in addition to an assignment for which they had to make one or two comprehension questions based on reading a passage. For the pre-tests and the post-tests, they took a TOEIC reading test with 40 questions and a structure test with 25 questions. The results of the tests show that both groups improved significantly in the two post-tests, benefiting from this learning method. However, the additional treatment for Group 2 did not seem to be highly effective. In the questionnaire survey, the participants think that the method of learning English questions has helped them better understand English grammar as well as interrogative structures. The participants were also divided into three different levels: high, intermediate, and low. The intermediate level group students benefited most from learning writing questions as the results of the post-test of the 25-questions test and the final exam of the course show.
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Choi, Wookhee,Kim, Suejin,Baek, Yong-Wook,Choi, Kyungho,Lee, Keejae,Kim, Sungkyoon,Yu, Seung Do,Choi, Kyunghee Elsevier 2017 International journal of hygiene and environmental Vol.220 No.2
<P><B>Abstract</B></P> <P>National biomonitoring program can offer solid scientific evidence on exposure profiles of environmental chemicals at a national level, and provide a snapshot of changing exposure level over time. Therefore, several countries have maintained such programs for developing environmental health policies. The Korean National Environmental Health Survey (KoNEHS) was designed to understand the level of human exposure to environmental chemicals by time and location, and to identify possible sources of such exposure. The 2nd stage of KoNEHS, which was conducted between 2012 and 2014, examined a total of 6478 adult subjects over 19 years of age, and measured 21 environmental chemicals of major policy concern. Compared to the findings from the first stage monitoring (2009–2011), slightly higher levels of blood lead were observed, while those of mercury remained similar. Blood metal concentrations, however, were higher than those reported from national biomonitoring programs of United States, Germany and Canada. The urinary concentrations of phthalates metabolites were lower, but those of t,t-muconic acid and BPA were higher than those reported in the first stage survey. The urinary cotinine level decreased perhaps reflecting general declining patterns of first- and second-hand smoking. The results of the second stage survey were made available for public use since April 2016.</P> <P>Some policy efforts appear to be at least in part effective on mitigating chemical exposure among people, e.g., urinary phthalate metabolites and cotinine, while further confirmations are warranted. In-depth assessments will be conducted to identify vulnerable groups and important exposure pathways.</P>
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KyungHee Choi,KyeChung Park,SunYoung Lee,YunSu Do 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10
This research is aiming to develop generic attractants for lepidopteran pests that can be used as a control tool for environmentally friendly management against the lepidopteran pests in orchards. During the first year of this research we carried out various trapping experiments in apple orchards in Korea. Field trapping experiments were carried out at two apple orchards in UaiSung-Gun, GyungBuk Province during May – September 2010, using different rice wines and fruit-based fermenting baits. Overall, when six major moth pest species(Grapholita molesta, Carposina sasakii, Adoxophyes orana, Choristoneura longicellana, Archippus breviplicanus, Phyllonorycter ringoniella) in apple orchards were counted, 445 moths were captured in raw material-baited traps and 1,566 moths in sex pheromone-baited traps. There were no clear differences in the attractiveness to the moths between different kinds of rice wines and fruit baits when the attractiveness of fifteen different rice wines and seven fermenting fruit baits were compared in the apple orchards. One rice wine (‘Chung-ju’ rice wine) and fermenting pineapple showed somewhat higher attractiveness to G. molesta than other raw baits, which will be re-examined in 2011 – 2012 periods.
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Two-dimensional van der Waals nanosheet devices for future electronics and photonics
Choi, Kyunghee,Lee, Young Tack,Im, Seongil Elsevier 2016 NANO TODAY Vol.11 No.5
<P><B>Abstract</B></P> <P>Two dimensional (2D) van der Waals (vdW) nanosheet semiconductors have recently attracted much attention from researchers because of their potentials as active device materials toward future nano-electronics and – optoelectronics. This review focuses on the performance and applications of state-of-the-art vdW 2D material devices which use transition metal dichalcogenides, graphene, hexagonal boron nitride (h-BN), and black phosphorous: field effect transistors (FETs), complementary metal oxide semiconductor (CMOS) inverters, Schottky diode, and PN diode. High mobility in FETs, electrical switching dynamics in CMOS inverter, photovoltaic switching for dynamic energy harvesting in PN diode, and high current driving FETs for organic light emitting diode pixel switching are demonstrated, however, remaining important issues for future electronics and photonics applications are also introduced. As a final contribution of this review, the ultimate orientations for future applications of 2D devices are forecasted and suggested, which are toward ubiquitous electronics to be a part of internet of things as integrated with existing semiconductor devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Review most of 2D vdW-based electronic and optoelectronic devices. </LI> <LI> Include all 2D vdW FET and LED using TMDs, graphene, and h-BN in the review. </LI> <LI> Point out remaining issues of currently-reported vdW devices toward future practical applications. </LI> <LI> Suggest new type of devices such as 2D-1D hybrid PN diodes and metal semiconductor field effect transistors. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Choi, Kyunghee,Lee, Kimoon,Yu, Sanghyuck,Oh, Sehoon,Choi, Hyoung Joon,Bae, Heesun,Im, Seongil American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.24
<P>Transition-metal dichalcogenides are currently under rigorous investigation because of their distinct layer-dependent physical properties originating from the corresponding evolution of the band structure. Here, we report the highly resolved probing of layer-dependent band structure evolution for WSe<SUB>2</SUB> using photoexcited charge collection spectroscopy (PECCS). Monolayer, few-layer, and multilayer WSe<SUB>2</SUB> can be probed in top-gate field-effect transistor platforms, and their interband transitions are efficiently observed. Our theoretical calculations show a great coincidence with the PECCS results, proving that the indirect Γ-K and Γ-Λ transitions as well as the direct K-K transition are clearly resolved in multilayer WSe<SUB>2</SUB> by PECCS.</P> [FIG OMISSION]</BR>
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KyungHee Choi,Dong-Hyuk Lee,Yeong-Tae Kim 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
Recently, ambrosia beetles have become very important pest of 2~5 year old apple trees with M9 dwarf rootstocks in South Korea. The beetles have killed the branches and stems of the young trees, especially, frozen damage trees in winter or drought stressed tree in spring. By the increase in planting area and weaken property in winter of M9 dwarf rootstock, ambrosia beetles are becoming a key pest in Korean apple orchards using M9 rootstock. According to the survey of damaged apple trees by ambrosia beetles, Xylosandrus germanus Blandford, Xyleborus apicalis Blandford and Xyleborinus saxeseni (Ratzeburg). These insects are hosts of the ambrosia fungi. ITS region of rDNA has shown to be a useful source for phylogenetic studies and identifying speices in previous published articles. We analyzed the nucleotide sequences of ITS1, 5.8S and ITS2 region of ambrosia fungi isolated from three ambrosia beetles, in order to observe molecular variation among the fungi strains and to reveal phylogenetic relationships.
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