The amount of plastic waste generated from households and industrial secter in 2000 was approximately over 4 million tons. However, less than 30% of plastic waste was recycled in 2004 as a raw materials and the rest is finally discarded in landfill and/or incineration. Particularly, mixed plastic wa...
The amount of plastic waste generated from households and industrial secter in 2000 was approximately over 4 million tons. However, less than 30% of plastic waste was recycled in 2004 as a raw materials and the rest is finally discarded in landfill and/or incineration. Particularly, mixed plastic waste generated from the households after mechanical and/or hand sorting processes amounts to 1,700,000 ton in 2005, but 20% of mixed plastic waste are reused and only 1.5% is used as an energy recovery due to lacks of separation technologies and economical reasons. In the present work, air classification system was developed to expand the recycling of the mixed plastic waste. This system has vibration, blowing and suction mechanisms to recover four different products from the waste, such as glass/soil/ceramics, film-type plastics, mainly plastics and heavy products containing metal cans, video tapes, etc. The system we developed has a capacity of 1 ton/h and high separation efficiency of over 98% for plastic recovery. The air classification tests were carried out on mixed plastic waste obtained from S city of the Kyunggi province, which contains 47.6% of plastics after removal of soil, glass, ceramics, etc. In air classification tests, air rate, banding length, vibration strength and belt speed were considered in order to find optimum conditions. As a result of tests, best separation and recovery rates were obtained at the air rate at 21.6 ㎥/min(vane angle 30º), banding length 14cm, vibration strength 600rpm and belt speed 500rpm, respectively. The obtained plastic samples after air classification will be used for gravity separation to recover the valuable plastics, such as polyolefin(PO) and PS plastics and to remove PVC and other impurities. As a result of this work, fundamental information is now available for the future recycling of mixed plastic wastes, which can be further used for chemical recycling as well as materials and/or thermal recycling areas.This work is focused on the improvement of digital circuits for SOP applications. First, I proposed a LTPS-TFT based level shifter which improved circuit performance. The proposed level shifter contains only 1 capacitor and reduce the chip area by 50%. Furthermore, it reduced power consumption by 93% by reducing the off-current. Secondly, I developed a optimization process for pTFT only current mode logic circuits. To justify the optimization process, I designed various current mode logic gates, a full adder, and a 64-stage current mode shift register. By following the optimization process, various multi-input current mode logic gates consumes identical power which is 9.7uW. This value is 70% smaller than those of static CMOS logic gates. Furthermore, chip area can be reduced by 40% as well. Lastly, I worked on the AGC (Automatic Gain Control) circuit in order to achieve high performance CMOS image sensor system. I was able to obtain a gain which is continuously proportional to the control voltage. The new circuit save chip area drastically. Throughout the course of this research, I used HSPICE for circuit simulation. Furthermore, I have designed and measured test panels which contained LTPS-TFT logic circuits for design verification.
The amount of plastic waste generated from households and industrial secter in 2000 was approximately over 4 million tons. However, less than 30% of plastic waste was recycled in 2004 as a raw materials and the rest is finally discarded in landfill and/or incineration. Particularly, mixed plastic waste generated from the households after mechanical and/or hand sorting processes amounts to 1,700,000 ton in 2005, but 20% of mixed plastic waste are reused and only 1.5% is used as an energy recovery due to lacks of separation technologies and economical reasons. In the present work, air classification system was developed to expand the recycling of the mixed plastic waste. This system has vibration, blowing and suction mechanisms to recover four different products from the waste, such as glass/soil/ceramics, film-type plastics, mainly plastics and heavy products containing metal cans, video tapes, etc. The system we developed has a capacity of 1 ton/h and high separation efficiency of over 98% for plastic recovery. The air classification tests were carried out on mixed plastic waste obtained from S city of the Kyunggi province, which contains 47.6% of plastics after removal of soil, glass, ceramics, etc. In air classification tests, air rate, banding length, vibration strength and belt speed were considered in order to find optimum conditions. As a result of tests, best separation and recovery rates were obtained at the air rate at 21.6 ㎥/min(vane angle 30º), banding length 14cm, vibration strength 600rpm and belt speed 500rpm, respectively. The obtained plastic samples after air classification will be used for gravity separation to recover the valuable plastics, such as polyolefin(PO) and PS plastics and to remove PVC and other impurities. As a result of this work, fundamental information is now available for the future recycling of mixed plastic wastes, which can be further used for chemical recycling as well as materials and/or thermal recycling areas.This work is focused on the improvement of digital circuits for SOP applications. First, I proposed a LTPS-TFT based level shifter which improved circuit performance. The proposed level shifter contains only 1 capacitor and reduce the chip area by 50%. Furthermore, it reduced power consumption by 93% by reducing the off-current. Secondly, I developed a optimization process for pTFT only current mode logic circuits. To justify the optimization process, I designed various current mode logic gates, a full adder, and a 64-stage current mode shift register. By following the optimization process, various multi-input current mode logic gates consumes identical power which is 9.7uW. This value is 70% smaller than those of static CMOS logic gates. Furthermore, chip area can be reduced by 40% as well. Lastly, I worked on the AGC (Automatic Gain Control) circuit in order to achieve high performance CMOS image sensor system. I was able to obtain a gain which is continuously proportional to the control voltage. The new circuit save chip area drastically. Throughout the course of this research, I used HSPICE for circuit simulation. Furthermore, I have designed and measured test panels which contained LTPS-TFT logic circuits for design verification.
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