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Xiao Shi,Yujing Jiang,Yasuyuki Hirakawa 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.2
Heisei lava dome was formed in Unzen volcano over the period from 1991 to 1995. The recent continuous observations have shown that the lava dome is still growing, which is a threat for the life of the nearby residents. How to estimate the range of collapse and potential block-and-ash flows is an urgent problem. Airborne laser scanning method is briefly introduced. We presented a division to separate the lava dome with 10 potential collapsed blocks and set some measuring points to observe the elevation change in each block. By analyzing the elevation decrease from 2003 to 2014, the potential collapsed blocks that experienced obvious changes were identified. With the evaluation of elevation changes by airborne laser data, the buried terrain of dome was reconstructed. The results show that the whole lava dome from lobe 1 to 11 may collapse, and the potential maximum volume of collapsed part is 1.46 × 107 m3. If the collapsed part forms block-and-ash flow, the flow will arrive at the seaside in approximately 7 minutes according to the result of simulation. The flow could travel approximately 8.5 km, and the average velocity is approximately 20 m/s.
Meile Wu,Xiaoshi Jin,Hyuck-In Kwon,Rongyan Chuai,Xi Liu,Jong-Ho Lee 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.3
The effect of band-to-band tunneling (BTBT) leads to an obvious increase of the leakage current of junctionless (JL) transistors in the OFF state. In this paper, we propose an effective method to decline the influence of BTBT with the example of ntype double gate (DG) JL metal-oxide-semiconductor field-effect transistors (MOSFETs). The leakage current is restrained by changing the geometrical shape and the physical dimension of the gate of the device. The optimal design of the JL MOSFET is indicated for reducing the effect of BTBT through simulation and analysis.
Wu, Meile,Jin, Xiaoshi,Kwon, Hyuck-In,Chuai, Rongyan,Liu, Xi,Lee, Jong-Ho The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.3
The effect of band-to-band tunneling (BTBT) leads to an obvious increase of the leakage current of junctionless (JL) transistors in the OFF state. In this paper, we propose an effective method to decline the influence of BTBT with the example of n-type double gate (DG) JL metal-oxide-semiconductor field-effect transistors (MOSFETs). The leakage current is restrained by changing the geometrical shape and the physical dimension of the gate of the device. The optimal design of the JL MOSFET is indicated for reducing the effect of BTBT through simulation and analysis.
Yuanyuan Yao,Chang-chuan Yin,Xiaoshi Song,Norman C. Beaulieu 한국통신학회 2016 Journal of communications and networks Vol.18 No.3
The performance of large-scale cognitive radio (CR) networkswith secondary users sustained by opportunistically harvestingradio-frequency (RF) energy from nearby primary transmissionsis investigated. Using an advanced RF energy harvester, asecondary user is assumed to be able to collect ambient primary RFenergy as long as it lies inside the harvesting zone of an active primarytransmitter (PT). A variable power (VP) transmission modeis proposed, and an energy-based opportunistic spectrum access(OSA) strategy is considered, under which a secondary transmitter(ST) is allowed to transmit only if its harvested energy is largerthan a predefined transmission threshold and it is outside the guardzones of all active PTs. The transmission probability of the STs isderived. The outage probabilities and the throughputs of the primaryand the secondary networks, respectively, are characterized. Compared with prior work, the throughput can be increased byas much as 29%. The energy-based OSA strategy can be generallyapplied to a non-CR setup, where distributed power beacons(PBs) are deployed to power coexisting wireless signal transmitters(WSTs) in a wireless powered sensor network.
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.
Huan Liu,Nannan Lu,Xiaojun Wang,Xiaoshi Hu,Deqiang Chen 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.3
In this study, the wear behaviors of the solution-treated and as-extruded SiCp/AZ91D metal matrix composites with differentsizes and volume fractions of SiC particles were systematically investigated under different wear test parameters. The SiCparticles exhibited a typical necklace-type distribution in the solution-treated composites and a homogeneous distributionin the as-extruded composites. Wear tests results showed that the wear rates of the as-extruded composites were lower thanthat of the solution-treated composites almost under all testing conditions and with the same SiC size and volume fraction. However, the dominant wear mechanisms for these two types of composites were different. The typical necklace-type distributionof SiCpin the solution-treated composites could effectively promote the occurrence of delamination owing to theweak bonding between SiCpand matrix in the particle aggregated regions. By contrast, as the bond between disperse SiCpand matrix was enhanced, the homogeneous distribution of SiCpin the as-extruded composites could promote the occurrenceof adhesion and prevent the occurrence of delamination. Moreover, a higher applied load and higher volume fraction of SiCpobviously promoted the progress of delamination for the solution-treated composites, while the extent of the adhesive wear forthe as-extruded composites was mainly associated with the increase of the applied load, sliding velocity and SiC particle size.
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>
MPMTP-AR: Multipath Message Transport Protocol Based on Application-Level Relay
( Shaowei Liu ),( Weimin Lei ),( Wei Zhang ),( Xiaoshi Song ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.3
Recent advancements in network infrastructures provide increased opportunities to support data delivery over multiple paths. Compared with multi-homing scenario, overlay network is regarded as an effective way to construct multiple paths between end devices without any change on the underlying network. Exploiting multipath characteristics has been explored for TCP with multi-homing device, but the corresponding exploration with overlay network has not been studied in detail yet. Motivated by improving quality of experience (QoE) for reliable data delivery, we propose a multipath message transport protocol based on application level relay (MPMTP-AR). MPMTP-AR proposes mechanisms and algorithms to support basic operations of multipath transmission. Dynamic feedback provides a foundation to distribute reasonable load to each path. Common source decrease (CSD) takes the load weight of the path with congestion into consideration to adjust congestion window. MPMTP-AR uses two-level sending buffer to ensure independence between paths and utilizes two-level receiving buffer to improve queuing performance. Finally, the MPMTP-AR is implemented on the Linux platform and evaluated by comprehensive experiments.
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>