• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
• /
• pp.164-170
• /
• 2004

Misfiring is often observed during the high temperature quality assurance test of plasma display panel. This limits the productivity of PDP industry. In this paper, experimental observations on the misfiring at high panel temperature have been performed through time dependent discharge light output and static margin measurement. For the high temperature condition, firing voltage increment is found in both surface and facing discharges. This in turn increases time lag in address discharge, and results in increment of misfiring probability. In order to reduce this kind of misfiring, a new method that applies automatically different slope of ramp erasing pulse on the common electrode according to temperature variation is proposed. The experimental results show that controlling the slope of ramp erasing pulse is quite effective for compensating temperature-dependent variation of reset and address discharge.

• Journal of Chest Surgery
• /
• 제3권1호
• /
• pp.31-38
• /
• 1970

This is a report of three cases of successful embolectomy in peripheral arteries. First case was the patient who received a mitral commissurotomy 8 months ago. In that time, there was no evidence of left atrial thrombosis. He showed an embolism in the middle portion of left brachial artery without complaining of any ischemic pain. Embolectomy was performed 15 days after disappearance of radial pulse and resulted in no return of radial pulse postoperatively. Second case was a case of an embolism in lower portion of right brachial artery. She complained severe ischemic pain and cyanosis in the right forearm and fingers. She was also in the beginning state of cardiac failure, which was suspected from her hypertension associated with cardiomegaly and arrythmia Embolectomy was performed 17 hours after onset of acute pain. Immediate full pulsation of radial artery was obtained after embolectomy and the acute ischemic symptoms subsided gradually. Third case was an embolism in superior mesenteric artery which occured 24 hours after pneumonectomy for right bronchogenic carcinoma and the patient suddenly complained diffuse abdominal colicky pain. 7 hours after attack of abdominal pain. embolectomy with extensive reset ion of the small intestine was performed with uneventful recovery and without complication, such as short bowel syndrome, postoperatively. Histopathologically, the embolus was consisted of a tissue of anaplastic cell carcinoma, which was identical to the tumor of the resected right lung. Histological findings of other emboli of first and second case were old thrombus.

• Progress in Superconductivity
• /
• 제5권1호
• /
• pp.13-16
• /
• 2003

In this work, we have studied about an RSFQ (Rapid Single Flux Quantum) switch element. The circuit was designed, simulated, and laid out for mask fabrication. The switch cell was composed of a D flip-flop, a splitter, a confluence buffer, and a switch core. The switch core determined if the input data could pass to the output. “On” and o“off” controls in the switch core could be possible by utilizing an RS flip-flop. When a control pulse was input to the “on” port, the RS flip-flop was in the set state and passed the input pulses to the output port. When a pulse was input to the “off” port, the RS flip-flop was in the reset state and prevented the input pulses from transferring to the output port. We simulated and optimized the switch element circuit by using Xic, WRspice, and Julia. The minimum circuit margins in simulations were more than $\pm$20%. We also performed the mask layout of the circuit by using Xic and Lmeter.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제55권5호
• /
• pp.239-244
• /
• 2006

To drive the high-image quality plasma displays of XGA and/or full-HD, we must effectively improve the driving waveform, which get the reset period for the stabilized control of wall charges, the address period to select discharge or non-discharge, and sustain period for luminance in 1 TV-frame, and also the display quality. To accomplish them, the development of the technology for the fast address discharge is required. In this paper, the correlation between the sustain-electrode gap and address discharge characteristics for the high-speed addressing was analyzed using the measurements of dynamic voltage margins. Results showed that the narrower the gap between the sustain electrodes, the narrower the with of the scan pulse became and a dynamic margin of data voltage of 29.2 V was obtained at scan pulse width of $1.0{\mu}s\;and\;V_{ramp}$ of 240 V for driving 4-inch test penal, which the gap between sustain electrodes was $65{\mu}m$.

• KIEE International Transactions on Electrophysics and Applications
• /
• 제4C권5호
• /
• pp.215-219
• /
• 2004

The effects of ambient temperature on the discharge characteristics of Ne-Xe based micro discharge cells for ac-PDP (plasma display panel) have been studied. In ramp voltage driving, which is generally used as a reset method of PDP, two dissimilar modes of strong and weak discharge were found. As the interval between the former sustaining discharge and ramp voltage discharge becomes greater, the probability of a strong discharge increases. This suggests that a sufficient number of priming particles is necessary for initiating weak mode (Townsend discharge). It was discovered that under higher ambient temperatures, weak discharge occurs more frequently. The discharge time lag observed in square pulse driving of single cells becomes surprisingly smaller under higher ambient temperatures for the constant gas number density condition.

• Progress in Superconductivity
• /
• 제5권1호
• /
• pp.21-25
• /
• 2003

We have designed and simulated an 1-bit ALU (Arithmetic Logic Unit) by using a half adder. An ALU is the part of a computer processor that carries out arithmetic and logic operations on the operands in computer instruction words. The designed ALU had limited operation functions of OR, AND, XOR, and ADD. It had a pipeline structure. We constructed an 1-bit ALU by using only one half adder and three control switches. We designed the control switches in two ways, dc switch and NDRO (Non Destructive Read Out) switch. We used dc switches because they were simple to use. NDRO pulse switches were used because they can be easily controlled by control signals of SET and RESET and show fast response time. The simulation results showed that designed circuits operate correctly and the circuit minimum margins were ＋/-27%. In this work, we used simulation tools of XIC and WRSPICE. The circuit layouts were also performed. The circuits are being fabricated.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
• /
• pp.1391-1394
• /
• 2007

In this work, the discharge characteristics and temporal distribution of surface charges on the Sidoped MgO have been investigated and elucidated with the results of photon-induced surface current. Even though the Si doped MgO shows lower static voltage margin, higher luminous efficacy, and shorter statistical delay time, its discharge characteristics become deteriorated as the timing of scanning is delayed from the ramp type reset pulse down. Overall features of Si-doped MgO in discharge characteristics are well correlated with surface current characteristics.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
• /
• pp.1487-1490
• /
• 2006

One of the factors deteriorating PDP image quality is the nonlinearity and nonuniform of output luminance as a function of input gray level. A novel method using modified ADS driving scheme is proposed to decrease this nonlinearity. It optimizes the reset pulse and adjusts the subfields, makes the relation of output luminance and input gray level almost linear. This method can be applied to general commercial PDPs.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1999년도 하계학술대회 논문집 E
• /
• pp.2209-2211
• /
• 1999

본 논문은 새로운 방식의 리셋회로를 적용한 MPC(Magnetic Pulse Compressor)방식의 펄스파워 발생장치에 관한 것이다. 개발된 펄스파워 발생장치는 MPC를 구성하는 코아에 대하여 별도의 리셋회로를 구성할 필요가 없고, 리셋과정은 메인 파워가 전달될 때 이루어지도록 설계되어 있어서 코아의 체적을 최적화하고 시스템을 간단히 구현할 수 있는 장점이 있다. 스위칭 소자로서는 반도체 소자인 싸이리스터만을 채택하여 긴 수명과 높은 신뢰성을 기대할 수 있게 하였고, DSP를 이용한 Controller를 구현하여 출력전압의 크기와 주파수 변경을 가능하도록 하였다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제53권2호
• /
• pp.91-96
• /
• 2004

In darkroom condition, it was observed that a white picture pattern lasted several minutes leaves a recognizable trace in subsequent black background picture. Although this is not a serious problem for the most current public display or home TV applications, the image sticking should be minimized for future high quality multimedia display applications. In order to characterize this picture memory effect having relatively long time scale, spatially resolved luminance measurement and light waveform measurement have been performed. Pixels located at the outer boundary of white pattern previously displayed shows highest luminance. These cells also shows fastest ignition at the ramp up reset sequence. The luminance and ignition voltage differences between boundary cells and the other cells are increased with display duration and number of sustain-pulse. It is speculated that image sticking observed at the boundary cell is originated from the transport of charged particles and re-deposition of reactive species such as Mg, O provided from strong sustain discharge region.