• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2002년도 추계종합학술대회
• /
• pp.575-578
• /
• 2002

In this paper, we discuss carrier trapping model and trap characteristics of nitrided oxide thin film. Based on the experimental results, the carrier trapping model for system having multi-traps is proposed and is fitted with experimental data in order to determine trap parameter of nitride oxide and O2 annealed nitrided oxide. As a results of curve fitting, the heavy nitridation of oxide introduces three kinds of traps with capture cross section $\sigma$n1=1.48$\times$10$^{-17}$ $\textrm{cm}^2$, $\sigma$n2=1.51$\times$10$^{-19}$ $\textrm{cm}^2$, $\sigma$p=1.53$\times$10$^{-18}$ $\textrm{cm}^2$ and corresponding trap densities Nnl=2.66$\times$10$^{12}$ Cm$^{-2}$ , Nn2=1.32$\times$10$^{12}$ Cm$^{-2}$ , Np=8.35$\times$10$^{12}$ Cm$^{-2}$ .

• 전기학회논문지P
• /
• 제52권4호
• /
• pp.148-153
• /
• 2003

In this paper, the low voltage 3V Sigma-Delta Digital Analog Converter(DAC) is designed for using in the transmitter of ADSL analog front-end. We have developed the CMOS DAC according to ANSI T1.413-2(DMT) standard specifications of the chip. The designed 4th-order DAC is composed of three block which are 1-bit DAC, 1st-order Switched-Capacitor filter and analog active 2nd-order Resistor-Capacitor(RC) filter. The HSPICE simulation of the designed DAC showing 65db SNR, is connected with 1.1MHz continuous lowpass filter. And also, we have performed the circuits verification and layout verification(ERC, DRC, LVS) followed by fabrication using TSMC 2-poly 5-metal p-substrate CMOS $0.35{\mu}m$ processing parameter. Finally, the chip testing has been performed and presented in the results.

• International journal of advanced smart convergence
• /
• 제3권1호
• /
• pp.15-19
• /
• 2014

This study was compared the variation system of body posture condition for stability by the posture. We used a model of bio parameter on the basis of the move state in the standing posture. We compared the sway movement derived from average of the physical sensing condition. Vision condition of variation average (Vi-${\sigma}_{AVG-AVG}$) was verified slightly greater at $13.746{\pm}4.05$ unit. Vestibular condition of variation average (Ve-${\sigma}_{AVG-AVG}$) was verified slightly larger at $7.829{\pm}1.071$ unit. Somatosensory condition of variation average (So-${\sigma}_{AVG-AVG}$) was verified slightly smaller at $2.592{\pm}0.538$ unit. CNS condition of variation average (C-${\sigma}_{AVG-AVG}$) was verified slightly larger at $0.46{\pm}0.105$ unit. The valuation system will be to deduce the model of body management with falling and stroke and all that sort of things. There will be to infer a data algorithm and the evaluation of processing system.

• 한국공작기계학회논문집
• /
• 제15권5호
• /
• pp.65-71
• /
• 2006

This paper presents the robust design of gripper part for a high-speed LCD(Liquid Crystal Display) transfer system. In this paper, the $1^{st}$ DOE(Design of Experiment) is conducted to find out main-effect factors for the design of gripper part. Thirty-six analysis are performed using $ANSYS^{(R)}$ and their results are statistically analyzed using $MINITAB^{(R)}$, which shows that the factors, i.e., First-width, Second-width, Rec-width, and thickness of gripper part, are more important than other factors. The main effect plots shows that the maximum deflection and mass of gripper part are minimized by increasing First-width, Second-width, Rec-width and thickness. The $2^{nd}$ DOE is conducted to obtain RSM(Response Surface Method) equation. The CCD(Central Composite Design) technique with four factors is used. Optimum design is conducted using the RSM equation. Genetic algorithm is used for optimal design. Six sigma robust design is conducted to find out a guideline for control range of design parameter. To obtain six sigma level quality, the standard deviations of design parameters are shown to be controlled within 5% of average design value.

• 대한기계학회논문집A
• /
• 제24권3호
• /
• pp.794-802
• /
• 2000

Since the examination of CTOD problem revealed that the discrepancy among CTOD's was a matte., of definition, the relationships among parameters based on different definitions have been studied Particularly, the relationship between $\sigma$BS R-curve based on BS 7448 and R-curve based on the recently introduced $\sigma$5 parameter was investigated in this research. For the comparison, compact tension specimens of used 1Cr-0.5Mo steel, heat treated 1Cr-0.5Mo steel to mimic the new one, A12024-T6, and A12024-T351 were prepared and tested. Consequently, the relationship between $\sigma$5 and $\sigma$BS R-curves for tested materials were established by shifting the rotational center which could determined by rotation factor and ligament size.

• 대한화학회지
• /
• 제37권1호
• /
• pp.148-153
• /
• 1993

진한 황상 용액에서 4'-halogenated azoxybenzene 유도체의 Wallach 자리옮김 반응을 UV-Vis 분광학적 방법으로 재조사하였다. 흥미롭게도 log(rate)와 pi 비편재화 파라미터라 불리우는 치환체 상수, ${\sigma}_R{^+}$와의 도시에서 아주 좋은 직선관계$(logk_{obs}=-0.61\;{\sigma}_R{^+} -3.29,\;{\gamma = 0.998)$를 얻었다. 그 겨로가로 공명효과에 의해 크게 안정화될 수 있는 즉 + 전하를 가진$(DC^{++})$중간체를 거치는 B-L 메카니즘이 Wallach 재배열 반응에 더욱 강력히 주장된다.

• 한국산학기술학회논문지
• /
• 제15권7호
• /
• pp.4528-4535
• /
• 2014

본 논문은 승객 위치정보 기반의 지하철 분산대피 안내 시스템을 제안하고자 한다. 최근 지하철 역사는 지하철 승강장 역할 뿐만 아니라, 환승, 쇼핑몰, 영화관 등의 다양한 편의 시설과 결합하여 대형화, 복잡화 되어 가고 있다. 이러한 지하철 역사의 복잡도 증가에 비해서 비상시를 대비한 대피경로, 대피안내 등의 대비체계는 부족한 실정이다. 이를 해결하기 위하여 현재 지하철에 설치되어 있는 Access Point(AP)와 실제 통계 자료를 이용하여 지하철 각 객차의 전체 승객 수를 추정하고, 추정된 승객 수와 지하철 역사의 출구 정보를 기반으로 각 객차의 승객 대피 경로를 방향 지시등과 스마트폰의 Push 알람을 통해 제공함으로써, 비상 시 가장 위험한 지하철 승객의 신속하고 안전한 대피시스템을 제안하였다. OpenWrt 임베디드 OS가 설치된 AP를 이용하여 접속자 수를 추정하는 실험을 수행하였으며, 시뮬레이션을 통해 승객 수를 추정한 결과 신뢰구간 파라미터 $1{\sigma}$, $2{\sigma}$, $3{\sigma}$에서 15%, 17% 그리고 23%의 평균 에러율을 갖는 것을 확인하였다. 이를 통해 본 시스템의 가능성을 확인하였다.

• 한국광학회지
• /
• 제7권3호
• /
• pp.196-199
• /
• 1996

Gauss 동함수 변조가 이루어진 윤대구경에서 얻어지는 LSF가 전 구경으로 구해지는 LSF( $C_{o}$ $e^{-{\sigma}}$$^{2}$$x^{2}$/)와 같다는 사실을 증명하였다. $C_{o}$ , $C_{1}$은 윤대의 기하학적 구조에 따라서 정해지는 정수이고 진폭 감소율을 .alpha.로 잡을 때 .omega./.root.2<.sigma..leq.(1-.alpha./2.alpha.)$^{1}$2/ .omega.$_{o}$ 의 조건을 얻었다. .alpha.= $e^{-1}$, .lambda.=0.013.mu.m (연 X-선)일 때, .alpha.$_{o}$ '.leq.0.34.alpha.$_{o}$ =1.7cm의 조건을 만족하는 초분해능 윤대구경계로서, l=20cm, .alpha.$_{o}$ =5cm(NA=0.25)일 때, 내경의 최대치 1.7cm보다 약간 작은 .alpha.$_{o}$ '=1.5cm의 반사경계를 제안하였다.

• International Journal of Quality Innovation
• /
• 제10권1호
• /
• pp.1-23
• /
• 2009

Face the process yield rate improvements of motherboard, although general enterprises finish deployment goal of each functions by overall quality managements, through quality improvement methods, industry engineering methods, plan-do-check-act (PDCA) methods and other improvement solutions, but it is only can be improved partially and unable to enhance the yield rate of product to the target. It only can takes one step ahead to enhance the process yield rate of motherboard with six sigma ($6{\sigma}$) overall DMAIC process and tactics. This research aimed to use six sigma quality improvement tactics by DMAIC systematic procedure and tactics, and find the key factors that effect to the process yield rate of surface mount technology. It also identified the keys input and process and output index to satisfy customer requirements and internal process index. The results showed that the major effective factors by fishbone and process failure modes and effects analysis (PFMEA). If the index of input and output that can be quantified, the optimum parameter can be found through design of experiment to ensure that the process is stable. If the factor of input and output that cannot be quantified, we found out the effective countermeasure by Mind_Mapping, make sure whole processes can be controlled stably, to reach the high product quality and enhance the customer satisfaction.

• 천문학회보
• /
• 제46권1호
• /
• pp.30.3-30.3
• /
• 2021

In order to generate the 3D structure of the 21-cm signal during the reionization, semi-numerical simulations based on Excursion set formalism are broadly used. However, semi-numerical simulations in the realization of the 3D structure are known to be the ionizing photon non-conserving by the structure of the Excursion set approach. Recently, explicit photon conserving algorithms for semi-numerical simulations introduced, but they are still too slow when forward modelling the 21-cm signal with high-dimensional parameter spaces. Here, we introduce a new method for approximately correcting photon non-conservation, which can be applied on-the-fly. This method is tailored towards the efficient simulation and Bayesian inference with high-dimensional parameter space. Then, we investigate how large an impact that photon non-conservation has on astrophysical parameter inference by performing an MCMC analysis. We find that the ionizing escape parameter is deviated from the fiducial value by 2 sigma when we infer astrophysical parameters without this correction.