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81.
SeungHyun Kim YoungJun Lee TaeHyuk Lee Hayk Hacob Nersisyan ManSik Kong DuckYoung Maeng JongHyeon Lee 《Combustion and Flame》2013
This work presents the use of a thermocouple technique for measuring temperature profiles in a condensed K2TaF7–Si system blended with a small amount of Teflon [(C2F4)n] or potassium chlorate (KClO3). A base experiment is described in detail to demonstrate the ability of the system to react under a low-rate self-sustaining mode at ambient temperature. The ignition temperatures, temperature–time profiles, combustion parameters, and final products are presented with respect to the additive concentration. The combustion processes begin at 340 and 450 °C for the KClO3 and (C2F4)n-containing mixtures, respectively. The maximum temperatures of both KClO3 and (C2F4)n-containing mixtures range from 470 to 960 °C and the combustion self-propagates along the sample at a speed of 0.01–0.08 cm/s. The solid combustion products produced under the optimized conditions include fine powders of tantalum, tantalum carbide, and tantalum silicides. The chemical mechanism of the combustion process and reaction parameters responsible for low-speed wave propagation are presented and discussed. 相似文献
82.
83.
A common approach to fault-tolerant software DSM is to take checkpoints with message logging. Our remote logging has low overhead
because each node saves the coherence-related data into the memory of a remote node through a high-speed system area network.
For more lightweight fault-tolerant DSM, in this paper, we mainly focused on eliminating shared memory checkpointing during
failure-free execution. Each node independently takes the checkpoints of execution states and non-shared data only. When a
node fails, it regenerates its pages from the remote copies in live nodes. In order to efficiently reconstruct pages, we also
introduced a XOR-diffing technique. The diff logs, which have been created by XOR operations during failure-free execution,
can be applicable to any version of remote copies either backward or forward for recovery. Our scheme reduces the checkpointing
overhead and also alleviates the imbalance in execution times among nodes due to independent checkpointing.
This research is supported by KISTEP under the National Research Laboratory program. 相似文献
84.
Jae-Sung Kwon Joo-Sung Maeng Myung-Suk Chun Simon Song 《Microfluidics and nanofluidics》2008,5(1):23-31
This paper addresses the effects of microchannel geometry with electrically insulating posts on a particle flow driven by
electrokinesis and dielectrophoresis. An in-house numerical program is developed using a numerical model proposed in literature
to predict particle flows in a microchannel with a circular post array. The numerical program is validated by comparing the
results of the present study to those in the literature. Results obtained from a Monte-Carlo simulation confirm the three
particle flow types driven by an external DC electric field: electrokinetic flow, streaming dielectrophoretic flow, and trapping
dielectrophoretic flow. In addition, we study the effects of electrokinetic and dielectrophoretic forces on particle transports
by introducing a ratio of lateral to longitudinal forces exerted on a particle. As a result, we propose an improved microchannel
geometry to enhance particle transports across electrokinetic streamlines for a given power dissipation. The improved microchannel
has a shorter longitudinal spacing between the circular posts than a reference microchannel. We also discuss the critical
values of dimensionless variables that distinguish the three particle flow types for both improved and reference microchannels. 相似文献
85.
I J Yu Y H Chung S H Maeng K S Song Y M Lee H K Chung H J Kim J I Park S K Lee Y H Lee J S Chang 《Quality Assurance: Good Practice, Regulation, and Law》1999,7(1):57-62
The Korean Society of Good Laboratory Practice (KSGLP) was established Dec. 10, 1998. The objectives of the KSGLP are to enhance the quality of domestic studies and the level of GLP compliance, in safety testing, and to promote information exchange among its members. The activities of KSGLP include: offering workshops and symposiums, linking with related governmental organizations, collecting GLP related information and providing the information to the related organizations, building international networks to collect information and to establish relationship, developing training materials and publishing periodicals, and other business necessary to achieve the objectives of the KSGLP. The KSGLP achieved its goals within a short period of time by offering workshops and symposia, and by providing important GLP related information in newspapers or via the KSGLP's internet homepage (www.ksglp.or.kr). The main role of the KSGLP will be to disseminate GLP technology nationwide. The KSGLP would like to help many labs that are preparing their facilities for GLP compliance. Further, the KSGLP is hoping to share GLP experiences with other members. 相似文献
86.
Sunglyul Maeng Prasanta Guha Florin Udrea Syed Z. Ali Sumita Santra Julian Gardner Jonghyurk Park Sang‐Hyeob Kim Seung Eon Moon Kang‐Ho Park Jong‐Dae Kim Youngjin Choi William I. Milne 《ETRI Journal》2008,30(4):516-525
This paper proposes a compact, energy‐efficient, and smart gas sensor platform technology for ubiquitous sensor network (USN) applications. The compact design of the platform is realized by employing silicon‐on‐insulator (SOI) technology. The sensing element is fully integrated with SOI CMOS circuits for signal processing and communication. Also, the micro‐hotplate operates at high temperatures with extremely low power consumption, which is important for USN applications. ZnO nanowires are synthesized onto the micro‐hotplate by a simple hydrothermal process and are patterned by a lift‐off to form the gas sensor. The sensor was operated at 200°C and showed a good response to 100 ppb NO2 gas. 相似文献
87.
We carried out comprehensive studies on structural, optical, and electrical properties of gallium-doped zinc oxide (Ga:ZnO) films deposited by atomic layer deposition (ALD). The gallium(III) isopropoxide (GTIP) was used as a Ga precursor, which showed pure Ga2O3 thin film with high growth rate. Using this precursor, conductive Ga doped ZnO thin film can be successfully deposited. The electrical, structural and optical properties were systematically investigated as functions of the Ga doping contents and deposition temperature. The best carrier concentration and transmittance (7.2?×?1020 cm?3 and 83.5 %) with low resistivity (≈3.5?×?10?3?Ωcm) were observed at 5 at.% Ga doping concentration deposited at 250 °C. Also, low correlation of deposition temperature with the carrier concentration and film structure was observed. This can be explained by the almost same atomic radius of Ga and Zn atom. 相似文献
88.
We present terahertz spectroscopic measurements of Dirac fermion dynamics from a large-scale graphene that was grown by chemical vapor deposition and on which carrier density was modulated by electrostatic and chemical doping. The measured frequency-dependent optical sheet conductivity of graphene shows electron-density-dependence characteristics, which can be understood by a simple Drude model. In a low carrier density regime, the optical sheet conductivity of graphene is constant regardless of the applied gate voltage, but in a high carrier density regime, it has nonlinear behavior with respect to the applied gate voltage. Chemical doping using viologen was found to be efficient in controlling the equilibrium Fermi level without sacrificing the unique carrier dynamics of graphene. 相似文献
89.
Bhaskar Sanyal Jae‐Jun Ahn Jeong‐Hwan Maeng Hyun‐Kyu Kyung Ha‐Kyeong Lim Arun Sharma Joong‐Ho Kwon 《Journal of food science》2014,79(9):C1656-C1664
Changes in cumin and chili powder from India resulting from electron‐beam irradiation were investigated using 3 analytical methods: electronic nose (E‐nose), Fourier transform infrared (FTIR) spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy. The spices had been exposed to 6 to 14 kGy doses recommended for microbial decontamination. E‐nose measured a clear difference in flavor patterns of the irradiated spices in comparison with the nonirradiated samples. Principal component analysis further showed a dose‐dependent variation. FTIR spectra of the samples showed strong absorption bands at 3425, 3007 to 2854, and 1746 cm?1. However, both nonirradiated and irradiated spice samples had comparable patterns without any noteworthy changes in functional groups. EPR spectroscopy of the irradiated samples showed a radiation‐specific triplet signal at g = 2.006 with a hyper‐fine coupling constant of 3 mT confirming the results obtained with the E‐nose technique. Thus, E‐nose was found to be a potential tool to identify irradiated spices. 相似文献
90.
Phototransistors with Negative or Ambipolar Photoresponse Based on As‐Grown Heterostructures of Single‐Walled Carbon Nanotube and MoS2
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Van Tu Nguyen Woongbin Yim Sae June Park Byung Hee Son Young Chul Kim Thi Thanh Cao Yumin Sim Yoon‐Jong Moon Van Chuc Nguyen Maeng‐Je Seong Sun‐Kyung Kim Yeong Hwan Ahn Soonil Lee Ji‐Yong Park 《Advanced functional materials》2018,28(40)
A facile synthesis method for the heterostructures of single‐walled carbon nanotubes (SWCNTs) and few‐layer MoS2 is reported. The heterostructures are realized by in situ chemical vapor deposition of MoS2 on individual SWCNTs. Field effect transistors based on the heterostructures display different transfer characteristics depending on the formation of MoS2 conduction channels along SWCNTs. Under light illumination, negative photoresponse originating from charge transfer from MoS2 to SWCNT is observed while positive photoresponse is observed in MoS2 conduction channels, leading to ambipolar photoresponse in devices with both SWCNT and MoS2 channels. The heterostructure phototransistor, for negative photoresponse, exhibits high responsivity (100–1000 AW?1) at low bias voltages (0.1 V) in the visible spectrum (500–700 nm) by combining high mobility conduction channel (SWCNT) with efficient light absorber (MoS2). 相似文献