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과업의 관여도 차이가 한국 대학생의 어휘 학습에 미치는 영향
박주연(Park, Juyeon),오준일(Park, Juyeon) 팬코리아영어교육학회(구 영남영어교육학회) 2015 영어교육연구 Vol.27 No.3
The aims of the present study were to test the task-induced vocabulary learning involvement load hypothesis in Korean university context and investigate whether the tasks actually induce the expected different levels of involvement load. A total of 75 English majors in a local university were randomly assigned to three task conditions that involved different levels of involvement: answering true-false questions after reading a glossed text, completing a gapped text using exact words from a glossary, and completing a gapped text affixing words from a glossary. On completing the tasks, the students were asked to take two post vocabulary tests and complete a survey designed to measure the difference in the amount of “evaluation” occurring cognitively during the performance of the task. Despite the trend that higher involvement led to more vocabulary learning, the results of a one-way analysis of variance showed no statistically significant differences in vocabulary retention among the three groups. On the other hand, the results of survey indicated that the group with the lowest involvement load achieved significantly lower scores, suggesting that the three tasks tapped different levels of vocabulary learning involvement. The theoretical and pedagogical implications of the study are discussed.
Park, Gyeong-Su,Lee, Eun Kyung,Lee, Jun Ho,Park, Juyeon,Kim, Seong Keun,Li, Xiang Shu,Park, Ju Cheol,Chung, Jae Gwan,Jeon, Woo Sung,Heo, Sung,Lee, Jae Hak,Choi, Byoung Lyong,Kim, Jong Min American Chemical Society 2009 NANO LETTERS Vol.9 No.5
<P>Methods of producing Si nanodots embedded in films of silicon oxide and silicon nitride abound, but fabrication of Si nanodots in a nanowire of these materials is very rare despite the fact that nanowire architecture enhances the charge collection and transport efficiencies for solar cells and field-effect transistors. We report a novel fabrication method for a high-density array of size-controlled sillicon nanodots from a silicon oxide nanowire using electron-beam irradiation. Our results demonstrate that a highly dense phase of Si nanodots with a narrow size distribution can be made from a silicon oxide nanowire with a core-shell structure of crystalline silicon-rich oxide (c-SRO)/amorphous silicon oxide (a-SiO(2)). This new nanomaterial shows the carrier transport characteristics of a semiconductor. The initially produced amorphous Si nanodots can be readily turned into crystalline Si (c-Si) nanodots by thermal annealing. Key characteristics of c-Si nanodots such as their size, number density, and rate of nucleation and growth are easily controlled by varying the electron radiation dose and annealing temperature. Nanodot formation is mechanistically initiated by electron trapping at the c-SRO core as well as at the core-shell interface, which leads to out-diffusion of the negatively charged oxygen through Coulomb repulsion, fostering the aggregation of Si atoms.</P>
GaN HEMT MMIC Doherty Power Amplifier With High Gain and High PAE
Park, Yunsik,Lee, Juyeon,Jee, Seunghoon,Kim, Seokhyeon,Kim, Cheol Ho,Park, Bonghyuk,Kim, Bumman IEEE 2015 IEEE microwave and wireless components letters Vol.25 No.3
<P>This paper presents an approach to maximize the gain and power-added efficiency (PAE) of a Doherty power amplifier (PA) using a 0.25 <TEX>$\mu$</TEX>m GaN pHEMT. The conventional carrier PA has an input matching for the <TEX>${R}_{\rm OPT}$</TEX> load and does not deliver the 3 dB higher gain with <TEX>${2R}_{\rm OPT}$</TEX> load due to the mismatch and it degrades gain and PAE of the PA. To solve the problem, the input match of the carrier PA is optimized at the back-off power level with the <TEX>${2R}_{\rm OPT}$</TEX> output load, while the input is mismatched at a high power level. A Doherty PA with the concept is designed and implemented using a GaN pHEMT MMIC process at 1.8 GHz. The measured average output power, power-added efficiency and gain are 35.6 dBm, 56.3%, and 18.9 dB for a 10 MHz LTE signal with a 6.5 dB PAPR.</P>
Park, Boyoung,Choi, Ji-Yeob,Sung, Ho Kyung,Ahn, Choonghyun,Hwang, Yunji,Jang, Jieun,Lee, Juyeon,Kim, Heewon,Shin, Hai-Rim,Park, Sohee,Han, Wonshik,Noh, Dong-Young,Yoo, Keun-Young,Kang, Daehee,Park, Su Wolters Kluwer Health 2016 Medicine Vol.95 No.14
<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>We conducted a heterogeneous risk assessment of breast cancer based on the hormone receptor (HR) and human epidermal growth factor receptor 2 (HER2) calculating the risks and population-based attributable fractions (PAFs) for modifiable and nonmodifiable factors.</P><P>Using matched case–control study design from the Seoul Breast Cancer Study and the national prevalence of exposure, the risks and PAFs for modifiable and nonmodifiable factors were estimated for total breast cancers and subtypes.</P><P>The attribution to modifiable factors was different for each subtype (luminal A, PAF = 61.4% [95% confidence interval, CI = 54.3%–69.8%]; luminal B, 21.4% [95% CI = 18.6–24.9%]; HER2-overexpression, 59.4% [95% CI = 47.8%–74.3%], and triple negative tumors [TNs], 27.1% [95% CI = 22.9%–32.4%)], and the attribution to the modifiable factors for the luminal A and HER2-overexpression subtypes was higher than that of the luminal B and TN subtypes (<I>P</I> heterogeneity ≤ 0.001). The contribution of modifiable reproductive factors to luminal A type in premenopausal women was higher than that of the other subtypes (18.2% for luminal A; 3.1%, 8.1%, and −3.1% for luminal B, HER2-overexpression, and TN subtypes, respectively; <I>P</I> heterogeneity ≤ 0.001). Physical activity had the highest impact preventing 32.6% of luminal A, 14.5% of luminal B, 38.0% of HER2-overexpression, and 26.9% of TN subtypes (<I>P</I> heterogeneity = 0.014). Total reproductive factors were also heterogeneously attributed to each breast cancer subtype (luminal A, 65.4%; luminal B, 24.1%; HER2-overexpression, 57.9%, and TN subtypes, −3.1%; <I>P</I> heterogeneity ≤ 0.001).</P><P>Each pathological subtype of breast cancer by HRs and HER2 status may be associated with heterogeneous risk factors and their attributable risk, suggesting a different etiology. The luminal B and TN subtypes seemed to be less preventable despite intervention for alleged risk factors, even though physical activity had a high preventable potential against breast cancer.</P></▼2>
The adverse impact of personal protective equipment on firefighters’ cognitive functioning
Juyeon Park 복식문화학회 2019 服飾文化硏究 Vol.27 No.1
Firefighters wear Personal Protective Equipment (PPE) for protection from environmental hazards. However, due to the layers of protective functions, the PPE inevitably adds excessive weight, bulkiness, and thermal stress to firefighters. This study investigated the adverse impact of wearing PPE as an occupational stressor on the firefighter’s cognitive functioning. Twenty-three firefighters who had been involved in firefighting at least for 1 year were recruited. The overall changing trend in the firefighter’s cognitive functioning (short-term memory, long-term memory, and inductive reasoning) was measured by the scores of three standardized cognitive tests at the baseline and the follow-up, after participating in a moderate-intensity physical activity, wearing a full ensemble of the PPE. The study findings evinced the negative impact of the PPE on the firefighter’s cognitive functioning, especially in short-term memory and inductive reasoning. No significant influence was found on the firefighter’s long-term memory. The results were consistent when the participant’s age and BMI were controlled. The outcomes of the present study will not only fill the gap in the literature, but also provide critical justification to stakeholders, including governments, policymakers, academic communities, and industry, for such efforts to improve human factors of the firefighter’s PPE by realizing the negative consequences of the added layers and protective functions on their occupational safety. Study limitations and future directions were also discussed.