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여대생의 인유두종 바이러스 및 인유두종 바이러스 백신 관련 지식과 예방접종 실태와의 상관관계
Xu, Meiling,김현지,이희수,이윤지,한동연,박소영,엄효윤,최정민,홍서진,홍예림,이경은,이혜림 이화여자대학교 간호과학대학 2017 이화간호학회지 Vol.- No.51
Purpose: Human Papillomavirus (HPV) vaccination is readily available, but immunization rate is minimal. Lack of knowledge concerning the HPV infection and vaccine is expected as the primary reason. The correlation between knowledge levels and vaccination will provide applicable guidelines for successful interventions. Method: 309 female university students have completed surveys September 2016, reporting of HPV infection knowledge, HPV vaccine knowledge, source of knowledge, and attitudes concerning vaccination. Result: HPV infection and vaccine knowledge levels were both suboptimal(9.57±1.84, 7.59±1.58), and the Internet(16.2%) was recognized as the most generally used means of obtaining information on the HPV vaccine. However, vaccination rates were reported to be low(28.2%), with lack of information(46.6%) hindering immunization. Correlations were found between HPV infection knowledge and cervical cancer insight, but the correlations between knowledge levels and vaccination rates were insignificant. Conclusion: Prior information on cervical cancer had an effect on the knowledge levels of HPV infection, but other factors were insignificant. Lack of information on the HPV vaccine was speculated, thus programs should focus on accessibility and effectiveness.
Recent Development of Dry Metal Forming
Meiling Geng,Lihong Cai,Jin-Cheol Kim,Hyeon-Seok Choi,Sung-Tae Hong 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.2
Dry metal forming (DMF) is a promising candidate for a sustainable metal forming process with economic and ecological benefits. For successful DMF, it is essential to adopt appropriate strategies to issues such as dry forming tools and lubrication. Even though DMF strategies have been actively investigated regarding structure design and surface coatings, there is still insufficient data to implement DMF in relevant industrial applications. Therefore, this paper reviews the research to date on the development of DMF and provides a comprehensive reference to promote the implementation of DMF as a substitute to metal forming processes with conventional lubrication systems.
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>
An FET-Type Gas Sensor for CO₂ Detection at Room Temperature using PEI-Coated SWNT
Meile Wu,Yoonki Hong,Dongkyu Jang,Xiaoshi Jin,Jong-Ho Lee 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.2
An FET-type CO₂ sensor using polyethylenimine (PEI) coated single-walled carbon nanotube (SWNT) is investigated. The sensor has a floating-gate (FG) and a control-gate (CG) formed in an interdigitated form in a horizontal direction. SWNT and PEI are sequentially printed on the platform by inkjet printing process. PEI coating reduces the I-V hysteresis of the FET platform and improves the CO₂ sensing properties. Since the sensor has an FG that can store the charge, the threshold voltage of the sensor can be tuned and its calibration is possible. When sensing 2000 ppm of CO₂ gas at room temperature, the DC read bias applied to CG showed very low sensitivity and significant drift characteristics. However, by applying a pulse bias, a response of ~16%, a response time of ~80 s, and a recovery time of ~200 s were obtained.
Gas-Sensing Characteristics of Exfoliated WSe<sub>2</sub> Field-Effect Transistors
Hong, Yoonki,Kang, Won-Mook,Cho, In-Tak,Shin, Jongmin,Wu, Meile,Lee, Jong-Ho American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.5
<P>A WSe2 field-effect transistor-based gas sensor is prepared and its gas-sensing performance is investigated. A highly n-doped silicon is used as a back-gate electrode and a WSe2 flake transferred from bulk WSe2 crystal is used as a gas-sensing layer, which acts as a p-type channel. The sensing characteristics of the sensor are measured for four target gases (NO2, SO2, NH3, H2S) at 25 degrees C. At a fixed concentration of 1 ppm, drain currents are changed by 347%, 72%, 16% and 26% in NO2, NH3, SO2 and H2S, respectively. The sensing mechanisms for oxidizing (NO2 and SO2) and reducing (NH3 and H2S) gases are explained.</P>
Pulse Biasing Scheme for the Fast Recovery of FET-Type Gas Sensors for Reducing Gases
Wu, Meile,Shin, Jongmin,Hong, Yoonki,Jin, Xiaoshi,Lee, Jong-Ho IEEE 2017 IEEE electron device letters Vol.38 No.7
<P>The promotive effect of a pre-bias condition on the recovery speed of a field-effect transistor-type gas sensor, which has a horizontal controlgate (CG) and floating gate (FG), is investigated in this letter. To verify the pre-bias effect in the recovery phase after the detection of H2S gas, a type of reducing gas, a 200-nm-thick layer of SnOx is deposited on top of the interdigitated CG and FG as a sensing material. A pulse measurement method is proposed to improve the recovery speed of the sensor for H2S gas sensing by applying a negative pre-bias condition to the CG before the read operation of the sensor. This method greatly accelerates the recovery and reduces the recovery time by 74% with a pre-bias of -3 V at 180 degrees C. The mechanism is explained in terms of energy band theory. The pre-biasing method used with our gas sensor is beneficial for the continuous monitoring and for the rapid detection of various gases.</P>
Effect of a pre-bias on the adsorption and desorption of oxidizing gases in FET-type sensor
Wu, Meile,Kim, Chang-Hee,Shin, Jongmin,Hong, Yoonki,Jin, Xiaoshi,Lee, Jong-Ho Elsevier 2017 Sensors and actuators. B Chemical Vol.245 No.-
<P><B>Abstract</B></P> <P>An efficient pre-bias method is proposed in the reading operation of a Field-Effect-Transistor(FET)-type gas sensor which utilizes flatband voltage change of the sensing material formed between the control-gate (CG) and floating-gate (FG) of the FET. The proposed method improves greatly recovery speed and shortens recovery time by more than 10 times at 180°C, which can reduce the power consumed by heater. Since the polarity of the pre-bias affects response, sensing and recovery speeds, it is possible to identify the redox characteristics of the detected gas. To verify experimentally the pre-bias effect, we apply pulses for the pre-biasing and reading to the sensor with a sensing material of 200-nm-thick SnO<SUB>x</SUB> layer to detect NO<SUB>2</SUB> gas as an example. The mechanism is explained theoretically by energy band theory. The pre-biasing method is expected to open a new biasing scheme which improves significantly sensing characteristics, gas identification, and power dissipation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pulse measurement method including pre-bias before reading operation was proposed. </LI> <LI> The polarity of the pre-bias affects response, sensing and recovery speeds. </LI> <LI> Principle responsible for the effect was explained by using energy band diagrams. </LI> <LI> A pulse cycle to enhance both response and recovery properties was provided. </LI> </UL> </P>
An FET-type gas sensor with a sodium ion conducting solid electrolyte for CO<sub>2</sub> detection
Wu, Meile,Shin, Jongmin,Hong, Yoonki,Jang, Dongkyu,Jin, Xiaoshi,Kwon, Hyuck-In,Lee, Jong-Ho Elsevier 2018 Sensors and actuators. B, Chemical Vol.259 No.-
<P><B>Abstract</B></P> <P>In this paper, a Field-Effect-Transistor (FET)-type gas sensor using the composite of Na<SUB>2</SUB>CO<SUB>3</SUB> and NaNO<SUB>2</SUB> as the sensing material is investigated. The sensor has a floating gate (FG) passivated by an insulator stack and a control gate (CG), which are formed in an interdigitated form in a horizontal direction. The inkjet printing process forms the sensing material on the interdigitated FG and CG. Just before forming the sensing material, a (3-aminopropyl) triethoxysilane (APTES) monolayer is formed to prevent diffusion of Na<SUP>+</SUP> ions contained in the sensing material through the insulator layer. The sensor can be electrically programmed like a typical memory device due to the FG, which makes the calibration of the sensor possible. CO<SUB>2</SUB> gas sensing properties of the sensor are characterized at an operating temperature of 160 °C. The results indicate that the proposed sensor produces a reasonable and repeatable response to a certain concentration of CO<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A programmable FET-type CO<SUB>2</SUB> sensor with a Na+ solid electrolyte is proposed. </LI> <LI> The proposed sensor has reasonable and repeatable response to CO<SUB>2</SUB> at 160 °C. </LI> <LI> An APTES monolayer effectively prevents Na+ ions diffusing through insulators. </LI> <LI> The sensing principle is explained and modeled based on electrochemical theory. </LI> </UL> </P>
유승철,Hong Meiling,Bian Wen,Piscarac, Diana 한국인터넷방송통신학회 2020 Journal of Advanced Smart Convergence Vol.9 No.3
The "New Korean Wave" (Shin Hallyu) phenomenon, which is represented by the global popularity of BTS and director Bong Joon-ho's film "Parasite," is making the world excited. The influence of the Korean Wave is not only on politics, society, and culture, but it also has considerable economic ripple effects. We applied individual in-depth interviews with seven media and marketing experts in China to assess the changes in the impact of Korean cultural content (i.e., Hallyu content) and examine the possibility of marketing for Korean small and medium-sized enterprises (SMEs) products using Hallyu content. Considering its massive market potential, China is still an attractive target for Korean companies and is of even greater importance to SMEs, which are highly dependent on exports and lacking marketing budgets as well as a professional workforce. Korean businesses and the economy at large would get a real boost if they could penetrate the Chinese market by utilizing the strength of Hallyu content. Based on the results of the in-depth interviews, the conclusion of our study suggests the direction of advertising strategy on how Korean products can attract the minds of Chinese consumers by utilizing the Shin Hallyu. This research is a practical study that diagnoses the reality of the Korean Wave in China objectively and has excellent practical implications as it proposes methods of how SMEs should use Hallyu for their marketing strategies.