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Hong, Seongbin,Shin, Jongmin,Hong, Yoonki,Wu, Meile,Jang, Dongkyu,Jeong, Yujeong,Jung, Gyuweon,Bae, Jong-Ho,Jang, Ho Won,Lee, Jong-Ho The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.37
<P>Oxygen (O2) sensors are needed for monitoring environment and human health. O2 sensing at low temperature is required, but studies are lacking. Here we report, for the first time, that the performance of a field effect transistor (FET)-type O2 sensor operating at 25 °C was improved greatly by a physisorption sensing mechanism. The sensing material was platinum-doped indium oxide (Pt-In2O3) nanoparticles formed by an inkjet printer. The FET-type sensor showed excellent repeatability under a physisorption mechanism and showed much better sensing performance than a resistor-type sensor fabricated on the same wafer at 25 °C. The sensitivity of the sensor increased with increasing Pt concentration up to ∼10% and decreased with further increasing Pt concentration. When the sensing temperature reached 140 °C, the sensing mechanism of the sensor changed from physisorption to chemisorption. Interestingly, the pulse pre-bias before the read bias affected chemisorption but had no effect on physisorption.</P>
Seongbin Hong 대한골대사학회 2023 대한골대사학회지 Vol.30 No.4
Background: This study aimed to investigate real-world data of C-terminal telopeptide (CTX), propeptide of type I collagen (P1NP), and osteocalcin through present multicenter clinical study, and retrospectively analyze the usefulness of bone turnover markers (BTMs) in Koreans. Methods: The study focused on pre- and post-menopausal patients diagnosed with osteoporosis and excluded patients without certain test results or with test intervals of over 1 year. The demographic data and 3 BTMs (CTX, P1NP, and osteocalcin) were collected. The patients were classified by demographic characteristics and the BTM concentrations were analyzed by the group. Results: Among women with no history of fractures, the levels of P1NP (N=2,100) were 43.544±36.902, CTX (N=1,855) were 0.373±0.927, and osteocalcin (N=219) were 10.81 ±20.631. Among men with no history of fractures, the levels of P1NP (N=221) were 48.498±52.892, CTX (N=201) were 0.370±0.351, and osteocalcin (N=15) were 7.868 ±10.674. Treatment with teriparatide increased the P1NP levels after 3 months in both men and women, with a 50% increase observed in women. Similarly, treatment with denosumab decreased the CTX levels after 3 months in both men and women, with a reduction of 50% observed in women. Conclusions: The results of this study can contribute to the accurate assessment of bone replacement status in Koreans. We also provide the P1NP level in the Korean population for future comparative studies with other populations.
Hong, Seongbin,Choi, Yunjin,Lee, Hun-Jae,Kim, So Hun,Oe, Younju,Lee, Seung Youn,Nam, Moonsuk,Kim, Yong Seong Korean Diabetes Association 2010 Korean diabetes journal Vol.34 No.1
<P><B>Background</B></P><P>Our aim was to assess the validity of a semi-quantitative food frequency questionnaire (FFQ) by comparison with the 3-day diet record (DR) in patients with type 2 diabetes.</P><P><B>Methods</B></P><P>Eighty five type 2 diabetic patients (aged 33 to 70 years) from the Korean National Diabetes Program (KNDP) completed 3-day DR and FFQ. The FFQ was designed to reflect the eating pattern of Korean type 2 diabetic patients, and was based on the 2003 Korean National Health and Nutrition Examination Survey. The FFQ consists of 85 food items and 12 food groups. The validity of FFQ was assessed by comparison with the 3-day DR.</P><P><B>Results</B></P><P>The mean age was 49 ± 10 years. Clinical characteristic including body weight, diabetic duration, and HbA1c were not different from the total cohort subjects (<I>n</I> = 1,478). There were no significant differences in the mean intake of protein, fat and calcium estimated by the FFQ and the 3-day DR. Energy and carbohydrate estimated by the FFQ were higher than those estimated by the 3-day DR. The correlation coefficient was highest for energy (<I>r</I> = 0.740; <I>P</I> < 0.00) and lowest for iron (<I>r</I> = 0.269; <I>P</I> < 0.05). The Kappa values for energy, carbohydrate, protein, fat and calcium were 0.54, 0.37, 0.36, 0.46, and 0.19, respectively.</P><P><B>Conclusion</B></P><P>The FFQ is a reasonable instrument for assessing the intake of most macronutrients in Korean type 2 diabetes, although careful consideration is required for the food groups and nutrients for which the FFQ had low validity.</P>
Shortcut Formula for the Evaluation of Adsorbents in Pressure Swing Adsorption
Seongbin Ga,Hong Jang,Jay. H. Lee 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Although many new adsorbent materials are being developed for CO₂ capture with the aim of using them in the industrial pressure swing adsorption (PSA) setting, the lack of a systematic methodology to evaluate their economic potentials with consideration of the energy requirement at the process level stands as a major challenge. As a step towards building such a methodology, we present a shortcut formula to calculate the theoretical efficiency of adsorbents in a PSA system. The shortcut formula calculates the amount of captured CO₂ based on an instantaneous isotherm approximation per consumed energy based on an ideal gas compressor. This study also suggests a method to calculate the pressure range satisfying a given target purity. The pressure range acts as a constraint when determining a proper operating pressure of a PSA system. The simulation of a PSA system based on rigorous model is carried out to support the validity of the formula. The trend of the efficiency with respect to the operating pressure, obtained from the formula is compared with that from the rigorous simulation.
( Yujeong Jeong ),( Seongbin Hong ),( Gyuweon Jung ),( Dongkyu Jang ),( Wonjun Shin ),( Jinwoo Park ),( Seung-ik Han ),( Hyungtak Seo ),( Jong-ho Lee ) 한국센서학회 2020 센서학회지 Vol.29 No.1
This study investigates the nitrogen dioxide (NO<sub>2</sub>) sensing characteristics of an Si MOSFET gas sensor with a tungsten trioxide (WO<sub>3</sub>) sensing layer deposited using the sputtering method. The Si MOSFET gas sensor consists of a horizontal floating gate (FG) interdigitated with a control gate (CG). The WO<sub>3</sub> sensing layer is deposited on the interdigitated CG-FG of a field effect transistor(FET)- type gas sensor platform. The sensing layer is deposited with different thicknesses of the film ranging from 100 nm to 1 μm by changing the deposition times during the sputtering process. The sensing characteristics of the fabricated gas sensor are measured at different NO<sub>2</sub> concentrations and operating temperatures. The response of the gas sensor increases as the NO<sub>2</sub> concentration and operating temperature increase. However, the gas sensor has an optimal performance at 180℃ considering both response and recovery speed. The response of the gas sensor increases significantly from 24% to 138% as the thickness of the sensing layer increases from 100 nm to 1 μm. The sputtered WO<sub>3</sub> film consists of a dense part and a porous part. As reported in previous work, the area of the porous part of the film increases as the thickness of the film increases. This increased porous part promotes the reaction of the sensing layer with the NO<sub>2</sub> gas. Consequently, the response of the gas sensor increases as the thickness of the sputtered WO<sub>3</sub> film increases.
Jeong, Yujeong,Shin, Jongmin,Hong, Yoonki,Wu, Meile,Hong, Seongbin,Kwon, Ki Chang,Choi, Seokhoon,Lee, Taehyung,Jang, Ho Won,Lee, Jong-Ho Elsevier 2019 Solid-State Electronics Vol.153 No.-
<P><B>Abstract</B></P> <P>This paper investigates the gas sensing characteristics of the MOSFET-type sensor having an inkjet-printed WS<SUB>2</SUB> sensing layer. The drain current of the gas sensor increases when NO<SUB>2</SUB> gas is injected into the test chamber since NO<SUB>2</SUB> gas is an oxidizing gas that extracts electrons from the sensing layer. On the contrary, the drain current decreases when H<SUB>2</SUB>S gas is injected into the test chamber since H<SUB>2</SUB>S gas is a reducing gas that donates electrons to the sensing layer. In both cases, the change of the drain current increases as the gas concentration increases. However, for other gases (NH<SUB>3</SUB> and CO<SUB>2</SUB>), the gas sensor has a small change of the drain current. The responses of the gas sensor to 10 ppm NO<SUB>2</SUB>, H<SUB>2</SUB>S, NH<SUB>3</SUB>, and CO<SUB>2</SUB> gases are 15.20%, 7.18%, 1.66%, and 3.02%, respectively. Therefore, the WS<SUB>2</SUB> sensor has a high selectivity for NO<SUB>2</SUB> gas among the four target gases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The drain current of the WS<SUB>2</SUB> gas sensor increases when NO<SUB>2</SUB> gas is injected, but decreases when H<SUB>2</SUB>S gas is injected. </LI> <LI> However, for other gases, the gas sensor has a small change of the drain current. </LI> <LI> As a result, the sensor has a high selectivity for NO<SUB>2</SUB> gas. </LI> </UL> </P>