• Journal of Information Display
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• 제1권1호
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• pp.42-47
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• 2000

The relationship between driving voltage and the amount of wall charge in the address period of surface discharge type AC Plasma Display Panel has been investigated. The amount of wall charge on each electrode is obtained simultaneously from the current profiles after applying only one addressing discharge pulse. The wall charge $Q_y$ on the scan electrode Y is almost the sum of $Q_x$ on the address electrode X and $Q_z$ on the sustain electrode Z. The $Q_y$ increased with the driving voltage regardless of the kind of electrode, whereas the addressing $T_d$ decreased. The $Q_x$ and $Q_y$ are increased considerably by blocking voltage $V_z$, whereas $Q_x$ is decreased. The $V_z$ dependence of $Q_x$ $Q_y$ and ${\varrho}_z$ in addressing discharge was $-13{\times}10^{-2}$ (pc/$V_z$), and $60{\times}10^{-2}$ ($pc/V_z$) and $70{\times}10^{-2}(pc/V_z)$, respectively.

• 한국정밀공학회지
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• 제30권2호
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• pp.154-163
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• 2013

Adhesive bonding and plastic welding have been widely used to join two plastic materials together. The goal of this paper is to determine a proper joining technology of a pair of flat panel (FP) photobioreactor (PBR) case. The material of the FP PBR case is polycarbonate (PC) plate. Two types of adhesion, including acryl adhesive and two-part epoxy adhesive, as well as two types of plastic welding technology, including ultrasonic welding and thermal welding, are employed for joining of PC plates. In order to influence of the adhesion and welding conditions on the joining characteristics of the PC plates in operational conditions of the FP PBR case, the morphology in the vicinity of the joined region as well as the water and pressure resistance characteristic are investigated. In addition, the variation of the bonding strength of the joined region and deformation behaviors in the vicinity of the joined region according to the adhesion and welding conditions is examined via the lap-shear test. From the results of basic experiments, proper joining technologies are chosen. Using the chosen joining technologies, the FP PBR case are fabricated to perform full-scale durability experiment. The results of the full-scale durability experiment have been shown that the chosen joining technologies can be applicable to fabricate the FP PBR case.

• 디지털융복합연구
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• 제19권1호
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• pp.11-22
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• 2021

코로나19 확산으로 초·중·고등학교에서 비대면 원격수업이 시행되고 있으나 가정의 ICTs 환경이 어떻게 갖추어져 있는지에 대한 실증데이터를 분석한 연구는 부족한 상황이다. 가정의 ICTs 환경이 원격수업에 적합한지 알아보기 위해 한국미디어패널조사 데이터를 사용하여 2012년과 2019년 사이 스마트기기 보유량의 변화와 가구 특성에 따른 스마트기기 보유량 차이를 살펴보았다. 본 연구결과에 따르면 2012년에 비해 2019년에는 데스크톱 PC 보유량은 줄어들었으나 노트북 PC, 태블릿 PC, 스마트폰의 보유량이 증가하여 전체적으로는 대부분의 가정에서 원격수업 환경이 갖추어진 것으로 볼 수 있다. 그러나 스마트기기에서 스마트폰을 제외할 경우, 가구소득 500만원 미만 가정에서는 자녀수 별로 원격수업에 필요한 기기를 갖추지 못한 비율이 약 30%로 나타나 가구소득에 따라 원격수업 여건이 다름을 보여준다. 본 연구는 가정의 ICTs 환경을 분석하고 소득집단에 따라 보유 기기 유형의 차이가 있음을 확인함으로써 원격수업으로 인한 불평등을 방지하기 위한 개입 지점을 제시한다는 점에서 의의가 있다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 추계 학술논문 발표대회
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• pp.137-140
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• 2009

Nowadays, the high performance composite materials are famous for the new construction materials as the construction buildings are bigger and higher. Out of them of all, the fiber reinforced concrete and mortar have been studied to develop and strengthen the performances of concrete, such as tensile strength, durability and the resistibility of crack. Also, it is considered that precast concrete is important alternatives of dry process for saving time, upgrading the material's quality and the productivity. Thus, PC panel is being produced for the use of dry wall as well as exterior finishing materials and it requires lots of tests and studies to be conducted to meet the various functional conditions. According to this study, it is considered that PVA fiber might be more effective than nylon fiber for developing the exterior PC panels.

• 전자공학회논문지SC
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• 제47권5호
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• pp.1-8
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• 2010

시장과 공장 환경 변화에 따라 생산관리의 용이성, 조작의 편리성, 높은 산업 안정성등의 요구가 본 논문에서는 네트워크기반의 시스템을 도입하여 단점을 보완한 새로운 고속, 초정밀 취출 로봇 제어기를 개발하였다. 개발된 제어기는 크게 티칭 팬던트와 중앙 서버 PC로 구분된다. 중앙 서버 PC는 관리자에게 전체 공정에 관련된 정보를 제공하게 된다. 티칭 팬던트는 중앙 서버 PC와 사출물 취출 로봇에 다리 역할로 사출로봇을 이용하는 사용자에게 제어 기능 및 사용자 인식, 금형파일 관리등 다양한 기능을 제공하게 된다. 사출물 취출을 위한 제어기 개발은 소프트웨어와 하드웨어 부분으로 나누어진다. 소프트웨어 개발은 3단계로 구분된다. 응용 프로그램과 유저 인터페이스 그리고 디바이스 드라이버로 구분되며, 간단한 디바이스 드라이버에는 따로 구분하지 않고 응용 프로그램에 포함되어 사용하도록 하였다. 하드웨어는 터치패널과 무선 네트워크를 도입하여 인터넷 접속 및 효율적인 공정 제어를 구축할 수 있도록 하였다. 기존의 시스템의 취출 싸이클이 5초였으나, 개선된 시스템을 도입하였을 경우 4초이내였으며, 다양한 무선 네트워크 기능으로 인한 공정 관리 및 생산 관리등 공정의 효율성을 높일 수 있었다.

• 한국정보처리학회논문지
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• 제6권5호
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• pp.1351-1361
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• 1999

The wide spread of multimedia system demands a large area viewing display device which can inform a message to many people in open area. This paper is about the design of a large area viewing LED panel control system. The control system runs on 16 bit microprocessor MC68EC000 and has following functions: 16 line clock and time, 2 channel priority interrupt, 2 channel direct memory access, 2 channel 12 bit clock and timer, 2 channel infrared remocon receiver, 2 channel RS-232C with 16 byte FIFO, IBM PC/AT compatible keyboard interface, ISA bus, battery backuped real time clock, battery backuped 256 byte SRAM and watch dog timer. The core circuits are implemented to ASIC, considering lower cost, higher reliability, higher performance, smaller dimension, and lower power consumption. This is verified by simulation and fabricated in 0.6 um CMOS SOG processes. The total gate count is 39,083 and the clock frequency is 48 MGz. The fabricated ASIC is mounted on test board.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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• pp.131-138
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• 2001

Total number of seven experimental specimens of size 4.6m$\times$2.4m are designed in full scale with due considerations given to the constructability as well as economic applications. Each specimen is made with different shapes of trusses or hooks along the interfacial surface between precast panel and topping concrete to maintain appropriate shear resistance. Structural performances in terms of strength and ductility under flexural load are examined for each specimen with different types of interfacial shear resistance reinforcements. Experimentally obtained flexural strength are also compared with those of analytical predictions. Based on experimental and analytical studies, design equations are suggested for the developed precast prestressed concrete half-slab systems.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.441-444
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• 2003

Polymer concrete has more useful than cement concrete in the strength and durability. So, it is widely utilizing as panel for wall, manhole for communication, foundation and underground connection box, etc. But polymer concrete is a defect that is disadvantageous in economical aspect because cost of resin is expensive. Polymer concrete (PC) using unsaturated polyester resins based on recycled polyethylene terephthalate(PET) plastic waste were used in our study for grasping its mechanical properties such as compressive strength, tensile strength, flexural strength and chemical resistance was tested by dealing with 20% HCl, 30% NaOH. As a result of it, compressive, tensile and flexural strength of PC indicated 752kgf/$\textrm{cm}^2$, 80kgf/$\textrm{cm}^2$ and 243kgf/$\textrm{cm}^2$ kind of satisfaction successively. Also, properties of chemical resistance are superior to those of cement concrete.

• Structural Engineering and Mechanics
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• 제37권2호
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• pp.177-196
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• 2011

An economic, structurally effective and practically applicable strengthening technique was developed for reinforced concrete (RC) framed buildings. The idea of the technique is to convert the existing hollow brick infill wall into a load carrying system acting as a cast-in-place RC infill wall by bonding relatively thin high strength precast concrete PC panels to the plastered hollow brick infill. For this purpose, a total of eight one-third scale, one bay, one story frames were tested under reversed-cyclic lateral loads. Test frames were designed and constructed with common deficiencies observed in practice. Four different panel types were used for strengthening. Test results showed that both strength and stiffness of the frames were significantly improved by the introduction of PC panels. Experimental results were compared with the analytical approaches suggested by the authors.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.395-397
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• 1996

The existing CPC(Center Position Controller) has unstably performed because of dusts on reflection panel, CCD protector contamination due to high temperature in furnace or other parameters. The reason is that the existing CPC has a Z80 processor as a CPU and only performs low level image processing as a simple edge detector. So the improvement of control system through the development of robust edge detection algorithm overcoming changes of measuring environment is needed. For this, in this study we carefully analyze the image of the strip rolled in occasion that measuring environment is changing, develop the optimal edge detection algorithm to solve the problems, generate the control signal suitable for the existing CPC(Center Position Controller), and propose the capability of application to the actual environment.