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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℃.
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.
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.
김용현,김대영,이광학 ( Yong Hyun Kim,Dae Young Kim,Kwang Hak Lee ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.3
N/A In thia study, wear resistance of P-V cast iron which is used as a material of cylinder liner for marine engine was investigated. Wear test was conducted by the wear test machine of Suzuki type(EFM-III-E model, 5000N for load, 4.0㎧ for velocity, Japan). Adhesive and scuffing wear phenomena was studied when load was changed from 60N to 400N and wear velocity was 0.25㎧ at room temperature and 250℃. In the case of dry friction at room temperature, scuffing phenomena of wear test specimens without vanadium was occurred at 400N, specimens with vanadium at the 400N was observed only adhesive wear phenomena. In the case of dry friction at 250℃, scuffing phenomena was observed at 180N for wear specimens without vanadium and 240N for wear specimens with vanadium.
김용현,이용복,정원일,김동규,강성진,Kim, Yonghyun,Lee, Yongbok,Jung, Wonil,Kim, Dongkyu,Kang, Sungjin 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.5
Cost estimates are necessary for government acquisition program to support decisions about funding, to develop annual budget requests and to validate resource requirements at key decision points. Many researches have been done about cost estimating technique recently. Parametric cost estimating models based on CERs(Cost Estimating Relationships) have been mainly used using regression method with historical data. However, there are many restrictions in developing Korean version CERs because the number of data points are too small. Specially, data collection and data management system are unstable in Korean defense environment, when developing CERs. In this research, we analyzed the historical data, and found some cost drivers in guided weapon system area. We developed the Acquisition Unit Cost CER using the regression to remove multicollinearity in the historical data. So we could overcome the restriction of the insufficient sample number. This research as a first attempt is meaningful in terms of obtaining our own Acquisition Unit Cost CER using historical cost and physical characteristic in Korean development environment.