• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
• /
• pp.773-775
• /
• 2004

For high end, large area displays, all current LC modes require some degree of optical compensation to improve the front of screen viewing experience. Currently most optical films are laminated to the outside of the LCD cell, between the glass and polariser. In this paper we wish to show how it is possible to integrate the compensating optical film within a VA mode LCD cell. The paper will describe the process of making the biaxial film through the process of in-situ photopolymerisation of an aligned film of reactive mesogens in the cholesteric phase using polarised UV light. The film can be made on the colour filter array side of the LCD panel. In addition the process of fabricating a VA mode LCD containing this film will be described and the performance of this module will be presented

• Journal of Power Electronics
• /
• 제14권2호
• /
• pp.369-382
• /
• 2014

A growing dynamic electrical demand has created an increasing interest in utilizing nonconventional energy sources like Photovoltaic (PV), wind power, etc. In this context, this paper focuses on the design and development of a composite power controller (CPC) in the decoupled double synchronous reference frame (DDSRF) combining the advantages of direct power control (DPC) and voltage oriented control (VOC) for a PV sourced grid connected inverter. In addition, a controller with the inherent active filter configuration is tested with nonlinear and unbalanced loads at the point of common coupling in both grid connected and autonomous modes of operation. Furthermore, the loss and reactive power compensation due to a non-fundamental component is also incorporated in the design, and the developed DDSRF model subsequently allows independent active and reactive power control. The proposed developed model of the controller is also implemented using MATLAB-Simulink-ISE and a Xilinx system generator which evaluate both the simulated and experimental setups. The simulation and experimental results confirm the validity of the developed model. Further, simulation results for the DPC are also presented and compared with the proposed CPC to further bring out the salient features of the proposed work.

• Smart Structures and Systems
• /
• 제8권1호
• /
• pp.39-52
• /
• 2011

We are developing a biomimetic robot based on the Sea Lamprey. The robot consists of a cylindrical electronics bay propelled by an undulatory body axis. Shape memory alloy (SMA) actuators generate propagating flexion waves in five undulatory segments of a polyurethane strip. The behavior of the robot is controlled by an electronic nervous system (ENS) composed of networks of discrete-time map-based neurons and synapses that execute on a digital signal processing chip. Motor neuron action potentials gate power transistors that apply current to the SMA actuators. The ENS consists of a set of segmental central pattern generators (CPGs), modulated by layered command and coordinating neuron networks, that integrate input from exteroceptive sensors including a compass, accelerometers, inclinometers and a short baseline sonar array (SBA). The CPGs instantiate the 3-element hemi-segmental network model established from physiological studies. Anterior and posterior propagating pathways between CPGs mediate intersegmental coordination to generate flexion waves for forward and backward swimming. The command network mediates layered exteroceptive reflexes for homing, primary orientation, and impediment compensation. The SBA allows homing on a sonar beacon by indicating deviations in azimuth and inclination. Inclinometers actuate a bending segment between the hull and undulator to allow climb and dive. Accelerometers can distinguish collisions from impediment to allow compensatory reflexes. Modulatory commands mediate speed control and turning. A SBA communications interface is being developed to allow supervised reactive autonomy.

• 대한안전경영과학회지
• /
• 제7권1호
• /
• pp.127-135
• /
• 2005

In general one can find an enormous number of studies about the productivity of land, labor and capital, very little has been done so far to communicate about the productivity of corporate information creating and information-consuming resources in ways that are useful to business executives. In view of the enormous share of corporate spending on information resources it would be useful in planning, budgeting, as well as in performance evaluation to measure how information resources are used in creating EVA(economic value-added). The effectiveness in deploying information resources has potentially a greater effect on corporate financial performance than any other economic influence. That in because corporate executives have greater discretion in directing what their information management staffs will do than in setting the terms for materials purchases, employee compensation, taxes or interest rates. The expenses for information are mostly in the form of overhead costs. Because expenses for information are mostly overhead costs and not for costs of goods, the prudent decision-maker should have a wide array of discretionary options available for allocating this resource. This study is intended for analysis the factors that having effects on the enterprise information productivity and is to description the factor using a foreign enterprise case study.

• Journal of Information Display
• /
• 제5권2호
• /
• pp.23-26
• /
• 2004

For high end, large area displays, all current LC modes require some degree of optical compensation to improve the front of screen viewing experience. Currently most optical films are laminated to the outside of the LCD cell, between the glass and polariser. In this paper we wish to show how it is possible to integrate the compensating optical film within a VA mode LCD cell. The paper will describe the process of making the biaxial film through the process of in-situ photopolymerisation of an aligned film of reactive mesogens in the cholesteric phase using polarised UV light. The film can be made on the colour filter array side of the LCD panel. In addition the process of fabricating a VA mode LCD containing this film will be described and the performance of this module will be presented.

• 비파괴검사학회지
• /
• 제32권5호
• /
• pp.540-544
• /
• 2012

위상배열 기술에 기반을 둔 통상의 초음파검사에서처럼, 자왜형 원거리 초음파검사에서도 실시간 수신신호 처리를 위해 복잡한 전자회로들을 사용하여왔다. 본 연구는 위상 보상, 노이즈 필터링, 파형 변환 등과 같은 필수적인 작업들을 기존의 하드웨어 접근보다는 소프트웨어 접근을 이용하여 수행할 때, 보다 유연하고 효율적인 실시간 신호처리가 가능해진다는 것을 보여준다. 이는 비용효율적인 원거리 초음파검사 시스템 구축과 검사 결과 분석에 기여할 것이다.

• 한국군사과학기술학회지
• /
• 제22권2호
• /
• pp.162-169
• /
• 2019

This paper describes a thermal image processing algorithm for uncooled type TEC-less IR detector which is applicable to fire control system of small arms. We implemented a real-time gain and offset compensation algorithm based on polynomial approximation from the raw dataset which is acquired by two reference temperature of blackbody from various FPA(Focal Plane Array) temperature. Through the experiment, we analyzed the output characteristics of detector's raw-data and compared IR image quality to traditional non-uniformity correction method. It shows that the proposed method works well in all FPA temperature range with low residual non-uniformity.

• 방송공학회논문지
• /
• 제24권1호
• /
• pp.182-185
• /
• 2019

본 논문에서는 프로그래머블 멀티포맷 비디오 복호화기를 구성하기 위한 기본 모듈들의 요구 성능을 분석하고 제안하였다. 제안한 플랫폼의 목적은 고성능 FHD 비디오 복호화기 구성이다. 제안한 복호화기는 재구성 가능한 프로세서, 전용 비트스트림 코프로세서, 메모리 제어기, 움직임 보상용 캐쉬 및 플렉서블 하드웨어 가속기 등으로 구성되었다. 300MHz 클럭을 사용했을 때 HEVC로 부호화된 초당 30 장의 FHD를 복호화 할 수 있는 모듈들의 성능에 대해서 분석하고 기본 성능을 제안하였다.

• 반도체디스플레이기술학회지
• /
• 제22권4호
• /
• pp.161-165
• /
• 2023

This paper designed a voltage feedback driving circuit to compensate for the characteristic deviation of the Active Matrix Organic Light Emitting Diode driving Thin Film Transistor. This paper describes a stable and fast circuit by applying charge sharing and polar stabilization methods. A 12-inch Organic Light Emitting Diode with a Double Wide Ultra eXtended Graphics Array resolution creates a screen distortion problem for line parasitism, and charge sharing and polar stabilization structures were applied to solve the problem. By applying Charge Sharing, all data lines are shorted at the same time and quickly positioned as the average voltage to advance the compensated change time of the gate voltage in the next operation period. A buffer circuit and a current pass circuit were added to lower the Amplifier resistance connected to the line as a polar stabilization method. The advantage of suppressing the Ringing of the driving Thin Film Transistor can be obtained by increasing the stability. As a result, a circuit was designed to supply a stable current to the Organic Light Emitting Diode even if the characteristic deviation of the driving Thin Film Transistor occurs.

• 융합신호처리학회논문지
• /
• 제15권4호
• /
• pp.176-182
• /
• 2014

본 논문에서는 대전상관기의 전처리를 위한 광역 프린지 탐색 소프트웨어 개발에 대해 기술한다. VLBI 관측의 경우 전파망원경에 의해 천체를 잘 관측하였는지 확인하기 위해 관측자는 관측일정에서 잘 알려져 있는 전파세기가 강하고 밝은 천체(포인터 소스, 참조천체)를 목적천체와 함께 관측을 수행한다. 상관기는 참조천체를 대상으로 상관 프린지가 잘 검출되는지 확인하는 전처리를 수행한다. 본 논문에서는 특정 관측국을 기준으로 각 관측국 사이의 정확한 지연시각을 계산하는 GFS 소프트웨어를 개발하였는데, 이 소프트웨어는 상관 전처리를 통하여 각 관측국에 위치한 수소원자시계와 GPS 시각 사이의 시각오차 정보 및 참조천체의 지연모델(상관모델)을 이용하여 정확한 지연시각을 계산한다. 개발한 소프트웨어의 성능을 확인하기 위한 상관 전처리 시험을 KaVA 관측망으로 관측한 참조천체와 목적천체에 대해 수행하였다. 시험결과는 GFS 소프트웨어로 찾은 지연시각 오차를 보정한 결과와 그렇지 않은 것의 비교에 따라 매우 좋은 성능을 보여 효과적임을 나타내었다.