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이종접합 Gate 구조를 갖는 수평형 NiO/Ga<sub>2</sub>O<sub>3</sub> FET의 전기적 특성 연구
이건희 ( Geon-hee Lee ),문수영 ( Soo-young Moon ),이형진 ( Hyung-jin Lee ),신명철 ( Myeong-cheol Shin ),김예진 ( Ye-jin Kim ),전가연 ( Ga-yeon Jeon ),오종민 ( Jong-min Oh ),신원호 ( Weon-ho Shin ),김민경 ( Min-kyung Kim ),박철환 ( 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.4
Gallium Oxide (Ga<sub>2</sub>O<sub>3</sub>) is preferred as a material for next generation power semiconductors. The Ga<sub>2</sub>O<sub>3</sub> should solve the disadvantages of low thermal resistance characteristics and difficulty in forming an inversion layer through p-type ion implantation. However, Ga<sub>2</sub>O<sub>3</sub> is difficult to inject p-type ions, so it is being studied in a heterojunction structure using p-type oxides, such as NiO, SnO, and Cu<sub>2</sub>O. Research the lateral-type FET structure of NiO/Ga<sub>2</sub>O<sub>3</sub> heterojunction under the Gate contact using the Sentaurus TCAD simulation. At this time, the VG-ID and VD-ID curves were identified by the thickness of the Epi-region (channel) and the doping concentration of NiO of 1 × 10<sup>17</sup> to 1 × 10<sup>19</sup> cm<sup>-3</sup>. The increase in Epi region thickness has a lower threshold voltage from -4.4 V to -9.3 V at I<sub>D</sub> = 1 × 10<sup>-8</sup> mA/mm, as current does not flow only when the depletion of the PN junction extends to the Epi/Sub interface. As an increase of NiO doping concentration, increases the depletion area in Ga<sub>2</sub>O<sub>3</sub> region and a high electric field distribution on PN junction, and thus the breakdown voltage increases from 512 V to 636 V at I<sub>D</sub> =1 × 10<sup>-3</sup> A/mm.
Kim Ga Hee,Park Hyungchul,Jung Kee Wook,Kim Min-Ju,Kim Ye-Jee,Lee Ji Min,Lee Bong Eun,Min Yang Won,Kim Jeong Hwan,Na Hee Kyong,Ahn Ji Yong,Lee Jeong Hoon,Kim Do Hoon,Choi Kee Don,Song Ho June,Lee Gin 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.6
Background/Aims: Although an association between achalasia and esophageal cancer has been reported, whether achalasia confers a substantial increase in mortality is unknown. Moreover, the causes of death related to achalasia have not been investigated. We performed this nationwide, population-based cohort study on achalasia because no such study has been performed since the introduction of high-resolution manometry in 2008. Methods: This study was performed using data extracted from the Korean National Health Insurance Service database, covering a 9-year period from 2009 to 2017. Control participants without a diagnostic code for achalasia were randomly selected and matched by sex and birth year at a case-to-control ratio of 1:4. Data on the cause of death from Statistics Korea were also analyzed. Results: The overall incidence of achalasia was 0.68 per 100,000 person-years, and the prevalence was 6.46 per 100,000 population. Patients with achalasia (n=3,063) had significantly higher adjusted hazard ratio (aHR) for esophageal cancer (aHR, 3.40; 95% confidence interval [CI], 1.25 to 9.22; p=0.017), pneumonia (aHR, 2.30; 95% CI, 1.89 to 2.81; p<0.001), aspiration pneumonia (aHR, 3.92; 95% CI, 2.38 to 6.48; p<0.001), and mortality (aHR, 1.68; 95% CI, 1.44 to 1.94; p<0.001). Esophageal cancer carried the highest mortality risk (aHR, 8.82; 95% CI, 2.35 to 33.16; p=0.001), while pneumonia had the highest non-cancer mortality risk (aHR, 2.28; 95% CI, 1.31 to 3.96; p=0.004). Conclusions: In this nationwide study, achalasia was associated with increased risk of mortality. Esophageal cancer and pneumonia were the most common comorbidities and the major causes of death in patients with achalasia.
Kim, Soojin,Lee, Ga Ye,Baeg, Jin-Ook,Kim, Youngmee,Kim, Sung-Jin,Kim, Jinheung American Chemical Society 2014 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.118 No.45
<P>Photochemical hydrogen production is carried out using molecular Rh complexes and sodium formate in the presence of platinum nanoparticles (PtNPs) in aqueous buffer solution. Visible-light-driven photocatalytic reactions for hydrogen production with and without nicotinamide adenine dinucleotide (NAD<SUP>+</SUP>) follow two different pathways. Complex [Cp*Rh(bpy)(OH<SUB>2</SUB>)]<SUP>2+</SUP> selectively reduces NAD<SUP>+</SUP> to generate NADH using formate as a proton and electron donor and the chemically generated NADH is sequentially used by PtNPs upon photoactivation of eosin Y to produce hydrogen. However, hydrogen is also produced in photoreactions of the Rh catalyst and PtNPs with formate in the absence of NAD<SUP>+</SUP> and eosin Y. The second pathway for hydrogen production was performed under the conditions without NAD<SUP>+</SUP> and eosin Y and derived from a direct electron transfer from <I>in situ</I> generated rhodium(III)-hydride species to photoexcited PtNPs. The direct electron transfer from the rhodium-hydride species to visible-light-driven PtNPs was first observed in this study. These two pathways for hydrogen production showed different rate-limiting steps based on a Hammett plot using Rh catalysts containing electron-donating and electron-withdrawing groups. Kinetic isotope effects as well as Hammett plot supported the rate-limiting step of the NADH generation for the first pathway of hydrogen production and the Rh–H formation for the second pathway.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-45/jp504876w/production/images/medium/jp-2014-04876w_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp504876w'>ACS Electronic Supporting Info</A></P>
Kim, Ga Eun,Choi, Ye Eun,Yang, Su Seong,Kim, Sun A,Bae, Young Sook 대한물리치료학회 2018 대한물리치료학회지 Vol.30 No.5
Purpose: This study compared the functional fitness and brake response of elderly and young drivers to confirm the correlation between the functional fitness and brake response. Methods: This study was a cross sectional observational design. Older drivers (>65age, n=21) and young adult drivers (20-40aged, n=20) were enrolled as subjects. The functional fitness of the subjects was measured using a senior fitness test consisting of a back scratch (BS), chair sit and reach (CSR), arm curl (AC), chair stand up (CSU), foot up and go (8-FUG), and 2-minute step (2-MS). The brake response used the virtual driving simulator to measure the brake reaction time (BRT) and braking distance (BD) according to the pedestrian protection and traffic signal compliance. Results: The older drivers had a lower BS (p<0.000), CSU (p=0.040), and 8-FUG (p=0.011) than the young adult drivers. BS and 8-FUG showed a significant positive correlation with the BRT and BD of pedestrian protection and traffic signal compliance. CSU showed a significant negative correlation with the BRT of pedestrian protection and traffic signal compliance. Conclusion: These findings suggest that the flexibility of the upper extremity, lower extremity strength, and agility are strongly correlated with the driving performance of elderly drivers.
( Ga Eun Kim ),( Ye Eun Choi ),( Su Seong Yang ),( Sun A Kim ),( Young Sook Bae ) 대한물리치료학회 2018 대한물리치료학회지 Vol.30 No.5
Purpose: This study compared the functional fitness and brake response of elderly and young drivers to confirm the correlation between the functional fitness and brake response. Methods: This study was a cross sectional observational design. Older drivers (>65age, n=21) and young adult drivers (20-40aged, n=20) were enrolled as subjects. The functional fitness of the subjects was measured using a senior fitness test consisting of a back scratch (BS), chair sit and reach (CSR), arm curl (AC), chair stand up (CSU), foot up and go (8-FUG), and 2-minute step (2-MS). The brake response used the virtual driving simulator to measure the brake reaction time (BRT) and braking distance (BD) according to the pedestrian protection and traffic signal compliance. Results: The older drivers had a lower BS (p<0.000), CSU (p=0.040), and 8-FUG (p=0.011) than the young adult drivers. BS and 8-FUG showed a significant positive correlation with the BRT and BD of pedestrian protection and traffic signal compliance. CSU showed a significant negative correlation with the BRT of pedestrian protection and traffic signal compliance. Conclusion: These findings suggest that the flexibility of the upper extremity, lower extremity strength, and agility are strongly correlated with the driving performance of elderly drivers.