• International Journal of Automotive Technology
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• v.2 no.2
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• pp.39-45
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• 2001

Hydrogen is seen as one of the important energy vectors of the next century. Hydrogen as a renewable energy source, provides the potential for a sustainable development particularly in the transportation sector. Hydrogen driven vehicles reduce both local as well as global emissions. The laboratory of transporttechnology (University of Gent) converted a GM/Crusader V-8 engine for hydrogen use. Once the engine is optimised, it will be built in a low-floor midsize hydrogen city bus for public demonstration. For a complete control of the combustion process and to increase the resistance to backfire (explosion of the air-fuel mixture in the inlet manifold), a sequential timed multipoint injection of hydrogen and an electronic management system is chosen. The results as a function of the engine parameters (ignition timing. injection timing and duration, injection pressure) we given. Special focus is given to topics related to the use of hydrogen as a fuel: ignition characteristics (importance of electrode distance), quality of the lubricating oil (crankcase gases with high contents of hydrogen), oxygen sensors (very lean operating conditions), noise reduction (configuration and length of inlet pipes). The advantages and disadvantages of a power regulation only by the air to fuel ratio (as for diesel engines) against a throttle regulation (normal gasoline or gas regulation) are examined. Finally the goals of the development of the engine are reached: power output of 90 kW, torque of 300 Nm, extremely low emission levels and backfire-safe operation.

• Current Photovoltaic Research
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• v.11 no.1
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• pp.34-37
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• 2023

Solar energy had become the main energy industry of renewable energy along with hydroelectric power generation. One of the technologies that contributed to the popularization of photovoltaic power and the decrease in the unit price of photovoltaic modules was the large-area solar cell. However, as the area increased, the light receiving area increased and the current value increased accordingly. Since power loss occurs when the current value was large, the number of busbar was increased to increase the current collection rate, and a technology to lower the current value through half-cutting was developed. The bus bar of the solar cell served as a passage through which the generated current was transmitted. This was because when the number of busbar decreases, the moving distance of electrons increased, so the amount of power generation decreases and when it increases, shadows occured. An important aspect of the electrode design was the optimal balance of these busbars and number of fingers. Therefore, in this study, the characteristics of the solar cell according to the number of front bus bars of the large-area solar cell were simulated using Griddler 2,5 pro. After selecting the number of busbar with the best characteristics, the difference was compared by varying the number of fingers and a better direction for the number of cutting was presented.

• Journal of Sensor Science and Technology
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• v.28 no.2
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• pp.133-138
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• 2019

The a-InGaZnO (a-IGZO) thin film transistor (TFT) has the advantages of larger mobility than that of amorphous silicon TFTs, acceptable reliability and uniformity over a large area, and low process cost. A capacitive-type touch sensor was studied with an a-IGZO TFT that can be used on the front side of a display due to its transparency. A capacitive sensor detects changes of capacitance between the surface of the finger and the sensor electrode. The capacitance varies according to the distance between the sensor plate and the touching or non-touching of the sensing electrode. A capacitive touch sensor using only one a-IGZO TFT was developed with the reduction of two bus lines, which made it easy to reduce the pixel pitch. The proposed sensor circuit maintained the amplification performance, which was investigated for various drive conditions.

• Korean Journal of Optics and Photonics
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• v.17 no.4
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• pp.342-346
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• 2006

A polymeric ring resonator with electrically variable extinction ratio at resonant wavelengths has been proposed and demonstrated. It consists of a ring waveguide coupled to a straight bus waveguide and a modulating electrode, which is formed in the outer cladding region outside of the ring. When electrical power is applied to the electrode, the refractive index of the polymers underneath the electrode is lowered to strengthen the confinement of the guided mode of the ring and thus the equivalent effective refractive index felt by the mode is decreased. Therefore, the propagation loss of the guided mode is reduced with the applied electrical power Consequently the extinction ratio at resonant wavelengths is varied by the electrical power. For the achieved results, the extinction ratio was changed by about 9 dB for the electrical power of 12 mW, when the propagation loss of the ring was reduced by 80 dB/cm.

• Journal of the Semiconductor & Display Technology
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• v.5 no.2 s.15
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• pp.7-10
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• 2006

The detailed studies regarding to the front and rear panel geometries of plasma display were needed to improve the luminance and efficiency. In plasma displays, 3-dimensional optical code can be used to analyze the variation of geometries and the changing of optical properties. The visible light distributions and illuminance were simulated depending on bus electrode position, ITO geometries, and alteration of dielectric layer's properties. This paper is concerned with development of a cell having high luminance and high efficiency for optical simulation. And the result of values could be expected to the application of real POP cell.

• Journal of Information Display
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• v.7 no.1
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• pp.35-40
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• 2006

Organic light-emitting diode (OLED) display panel using the charge-pump (CP) pixel addressing scheme was fabricated, and the results show that it is applicable for information display. A CP-OLED panel with 64 ${\times}$ 64 pixels consisting of thin-film capacitors and amorphous silicon Schottky diodes was fabricated using conventional thin-film processes. The pixel drive circuit passes electrical current into the OLED cell during most of the frame period as in the thin-film transistor (TFT)-based active-matrix (AM) OLED displays. In this study, the panel was operated at a voltage level of below 4 V, and this operation voltage can be reduced by eliminating the overlap capacitance between the column bus line and the common electrode.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1479-1482
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• 2006

Potentials and advantages of recently proposed raised bus electrode plasma display panel is discussed in terms of luminous efficiency, addressing speed. Detailed experimental and simulation results, which shows mechanisms of high efficiency driving mechanism, will also be given. Apart from the cell structure, we introduce new high efficiency driving method that can be applicable to conventional ac Plasma Display Panel.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2006.05a
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• pp.160-163
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• 2006

고정세 PDP에서 방전 cell의 휘도와 효율을 증가시키기 위해서는 cell을 구성하고 있는 layer의 광학 성질과 구조를 고려한 설계가 필요하다. 3-dimensional optical code를 사용한 새로운 접근 방법은 다양한 geometry의 구성, 광학 성질의 적용의 용이함, 정확한 분석 데이터 등의 장점을 활용하여 PDP cell의 구조와 재료 변화에 따른 광 패턴과 조도 ($1m/mm^2$)를 관찰함으로써 향상된 휘도와 효율 특성을 갖는 cell 구조를 설계할 수 있게 된다. 본 논문은 PDP 상판을 구성하는 ITO, bus electrode, dielectric layer의 구조와 광학특성을 변화 시키고, 현재 양산 모델에 적용중인 다양한 상판 구조를 optical code를 활용하여 연산하여 도출된 결과를 비교하였다.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.1827-1829
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• 2000

To replace the dual scan system by single scan in large ac plasma display(PDP), the addressing time should be reduced by modifying cell structure and driving circuits. Moreover. the luminance of the PDP can be also increased with the decrease in the addressing time. In this paper, various shapes of bus and address electrode have been investigated to reduce the addressing time in ADS driving method. The experimental results show that the addressing time can be reduced more than 30% compared to the conventional type by modifying the electrodes without reducing the luminance of the PDP.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.13 no.2
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• pp.163-169
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• 2000

In this paper, we showed the erosion characteristic of MgO protector layer releated to lifetime of plasma display panel(PDP). We observed MgO erosion characteristic as a functions of deposition conditions, pressure and distance between electrodes. In RIE condition of Xe gas, the lowest erosion rate appears in the conditions of no heating bias voltage -30V and pressure 5mtorr. In general, as deposition rate increases, erosion rate decreases. In real panel, when the gap distance between electrodes is narrow and the pressure is low, the heavy plasma damage appears. Also, the surfaces between electrodes and on the bus electrode are extremely damaged.