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김용현,김영훈,김한군 ( Y . H . Kim,Y . H . Kim,H . G . Kim ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.1
The variation of the mechanical properties and the formation of retained austenite with heat treatment conditions in austempered Si bearing carbon steels has been investigated. In the case of a steel containing 0.35C-1.48Si-0.95Mn, it has been found that a feather shape bainite structure of lath are obtained under a isothermal treated condition at just below the Ms temperature, and the martensite, bainitic ferrite and retained austenite of second phase particles on the ferrite matrix for a isothermal treated steels after intercritical annealing are precipitated in a linked shape. The retained austenite with 2㎛ size induced as TRIP is found to increase with increasing the formation rate of retained austenite for the intercritical annealing and high Si containing steels. The tensile strength is increased as austempering temperature increases in all isothermal treatment temperature, whereas the elongation is shown to roughly decrease as the tensile strength increases. The values of tensile strength-elongation balance have showed a marked dependence upon the elongation rather than the tensile stregth, and their values are increased for high Si containing steels and intercritical annealing condition. The most optimum result has been shown to be the tensile stregth-elongation balance of 2882.4kgf/㎟.% and the elongation of 33.3% for a B steel in the heat treating temperature range of 780∼370℃.
김용현,이승연,김원일,Kim, Yong-Hyeon,Lee, Seung-Yeon,Kim, Won-Il 대한한방소아과학회 2008 대한한방소아과학회지 Vol.22 No.1
Objectives The purpose of this study was to examine the anti allergic reaction with Cheonmaec-tang. Methods We examined Cell Viability, ${\beta}$-hexosaminidase, TNF-${\alpha}$, IL-4 secretion from RBL-2H3 cell after pretreatment with 2 ㎎/ml, 4 ㎎/ml of Cheonmaec-tang. Results We observed that Cheonmaec-tang is reduced to ${\beta}$-hexosaminidase, TNF-${\alpha}$, IL-4 secretion in RBL-2H3 cell. Conclusions These results indicate that Cheonmaec-tang has anti-histamic effect and controls TNF-${\alpha}$, IL-4 secretion on allergic reaction.
감시정찰 센서네트워크에서 하드웨어 모듈의 소모전력 분석을 통한 저전력 노드 설계 전략
김용현,여명호,정광수,Kim, Yong-Hyun,Yeo, Myung-Ho,Chung, Kwangsue 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.6
In this paper, we propose a low-power design strategy to minimize energy-consumption for surveillance and reconnaissance sensor networks. The sensor network consists of many different nodes with various operations such as target detection, packet relay, video monitoring, changing protocols, and etc. Each sensor node consists of sensing, computing, communication, and power components. These components are integrated on a single or multiple boards. Therefore, the power consumption of each component can be different on various operation types. First, we identified the list of components and measured power consumption for them from the first prototype nodes. Next, we focus on which components are the main sources of energy consumption. We propose many energy-efficient approaches to reduce energy consumption for each operation type.
Zr<sub>2</sub>WP<sub>2</sub>O<sub>12</sub> 세라믹스의 합성과 소결거동 연구
김용현,김남옥,이상진,Kim, Yong-Hyeon,Kim, Nam-Ok,Lee, Sang-Jin 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.6
$Zr_2WP_2O_{12}$ powder, which has a negative thermal expansion coefficient, was synthesized by a solid-state reaction with $ZrO_2$, $WO_3$ and $NH_4H_2PO_4$ as the starting materials. The synthesis behavior was dependent on the solvent media used in the wet mixing process. The $Zr_2WP_2O_{12}$ powder prepared with a solvent consisting of D. I. water was fully crystallized at $1200^{\circ}C$, showing a sub-micron particle size. According to the results obtained from a thermal analysis, a $ZrP_2O_7$ was synthesized at a low temperature of $310^{\circ}C$, after which it was reacted with $WO_3$ at $1200^{\circ}C$. A new sintering additive, $Al(OH)_3$, was applied for the densification of the $Zr_2WP_2O_{12}$ powders. The cold isostatically pressed samples were densified with 1 wt% $Al(OH)_3$ additive or more at $1200^{\circ}C$ for 4 h. The main densification mechanism was liquid-phase sintering due to the liquid which resulted from the reaction with amorphous or unstable $Al_2O_3$ and $WO_3$. The densified $Zr_2WP_2O_{12}$ ceramics showed a relative density of 90% and a negative thermal expansion coefficient of $-3.4{\times}10^{-6}/^{\circ}C$. When using ${\alpha}-Al_2O_3$ as the sintering agent, densification was not observed at $1200^{\circ}C$.
김용현,정광수,Kim, Yong-Hyun,Chung, Kwang-Sue 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
This paper reports on a design of the footstep signal detection system using the seismic sensor. First, we analyzed the characteristics of seismic signal, seismic sensor, and the UGS(Unattended Ground Sensor) system with seismic sensors. In addition, we summarized the existing algorithms to detect footstep using the seismic sensors, and developed our low-power and high efficient footstep detection algorithm. In this paper, the sensor node operations are classified into three different steps and different resources and algorithms are applied to each step, not only to minimize the power consumption, but also to improve the performance.
Electrical, structural and etching characteristics of ZnO:Al films prepared by rf magnetron
김용현,이경석,Taek Sung Lee,정병기,성태연,Won Mok Kim 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Al doped ZnO (AZO) films were prepared by radio frequency (rf) magnetron sputtering with varying substrate temperature, working Ar gas pressure and rf power imposed on 2-inch ZnO–Al2O3 (2 wt%) target,and their electrical and structural properties together with the corresponding etching behavior in 0.5%HCl solution were examined. The effect of rf power on the electrical and structural properties of AZO films was marginal, but in the case of working Ar gas pressure and substrate temperature, substantial variations in the electrical and structural properties were observed. The optimum electrical properties were obtained for AZO film deposited at 150 ℃ in lowest working pressure of 1.2 mTorr. The behavior of crater formation upon etching varied significantly depending on the structure of the film, and it was shown that the etching rate could be expressed in inversely proportional function of the crystallinity represented as (002) peak intensity. Also, for films with similar crystallinity, i.e. (002) peak intensity, dense structured film deposited at high temperature had much lower etching rate than open structured films deposited under high working Ar gas pressure.
김용현,이진환,최준식,Kim, Yong-Hyun,Lee, Jin-Hwan,Choi, Jun-Shik 한국약제학회 1988 Journal of Pharmaceutical Investigation Vol.18 No.2
The influence of different suppository bases on the dissolution, and the bioavailability of aspirin suppositories in rabbits and humans was investigated using Witepsol H15 (WIT), WIT-Tween 80 (TWE), WIT-sodium lauryl sulfate (SLS), polyethylene glycol (PEG), hollow WIT (WIT-HOLL) and capsule incorporated into WIT (WIT-CAP). The results obtained were as follows: 1) Dissolution rates of aspirin suppositories with different bases in distilled water were faster in the order of WIT-TWE >WIT-SLS >PEG >WIT-HOLL >WIT >WIT-CAP. 2) The maximum blood levels $(C_{max})$ of aspirin in rabbits and humans were highest in WIT-TWE and WIT-SLS bases, but $C_{max}$ from WIT base was lower than that in oral administration of aspirin suspension. 3) The times reaching the maximum blood levels $(T_{max})$ in rabbits were 1 hr for oral administration, 1.5-2.5 hr for WIT-TWE, WIT-SLS, PEG, and WIT bases, and 2.5-4.0 hr for WIT-HOLL and WIT-CAP bases, but $T_{max}$ in humans were 1 hr for oral administration and WIT-TWE base, and 2-4 hr for WIT and WIT-HOLL bases. 4) Relative bioavailability (RBA) of aspirin suppositories in rabbits was higher in WIT-SLS, WIT-TWE and PEG bases than that in oral administration, and RBA of aspirin suppositories in humans was higher in the order of WIT-TWE >PEG >WIT-HOLL >oral >WIT bases tested. 5) Good correlation between dissolution rates and $C_{max}$ was obtained: y = 0.60x+32.23 (r = 0.96) for rabbits, and y = 0.60x+35.74 (r = 0.97) for humans.