• Journal of IKEEE
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• v.9 no.2 s.17
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• pp.161-169
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• 2005

This paper presents the new structural Low voltage LVTSCR and TWSCR ESD protection circuit. The proposed ESD protection circuit has lower triggering voltage than conventional circuits. And the LVTSCR has the triggering voltage of 9V, current of 7mA and can pass below 0.8KV (150mA/um). The triggering voltage of the Triple-well SCR measured to 6V and the current is 40mA. By the substrate and gate bias, the triggering voltage is lowered down to $4{\sim}5.5V$.

• Journal of ILASS-Korea
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• v.21 no.2
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• pp.71-77
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• 2016

Air pollutants nitrogen oxides are inevitably generated in the combustion reaction. Its amount trend is steadily increasing because the rapid modern industrialization and population growth. For this reason, NOx is controlled to reducing the harmful components in the exhaust gas. So Marine Environment Protection Committee (MEPC) take effect 'Tier I', 'Tier II' of air pollution regulation in 2005 and 2011 respectively. According to NOx emissions are strictly regulated management of the vessel through them. In addition, since 2016 the regulation enter into force in the next step 'Tier III' was confirmed by MEPC 66th committee. It's 80% enhanced emissions limits than the 'Tier I' Alternatively these emission regulation, research is actively being carried out about exhaust gas after-treatment methods through the vessel application of Selective Catalytic Reduction(SCR). Therefore depending on the basic specification of cell density according to the Area velocity, Space velocity, Linear velocity is studied the effects of NOx removal efficiency

• Journal of Korean Society of Environmental Engineers
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• v.27 no.8
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• pp.859-869
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• 2005

The commercial $V_2O_5-WO_3/TiO_2$ catalysts which had been exposed to the off gas from incinerator for a long time were regenerated by physical and chemical treatment. The catalytic properties and NOx conversion reactivity of those catalysts were examined by analysis equipment and NOx conversion experiment. The characterization of the catalysts were performed by XRD(x-ray diffractometer), BET, POROSIMETER, EDX(energy dispersive x-ray spectrometer), ICP(inductively coupled plasma), TGA(thermogravimetric analyzer) and SEM (scanning electron microscopy). NOx conversion experiment were performed with simulated off gas of the incinerator and $NH_3$ was used as a reductant of SCR reaction. Among the regeneration treatment methods which were applied to regenerate the aged catalysts in this study, it showed that the heat treatment method had excellent regeneration effect on the catalytic performance for NOx conversion. The catalytic performance of the regenerated catalysts with heat treatment method were recovered over than 95% of that of fresh catalyst. For the regenerated catalysts with the acid solution(pH 5) and the alkali solution(pH 12), the catalytic performance were recovered over than 90% of that of fresh catalyst. From the characterization results of the regenerated catalysts, the specific surface area was recovered in the range of $85{\sim}95%$ of that of fresh catalyst. S and Ca element, which are well known as the deactivation materials for the SCR catalysts, accumulated on the aged catalyst surface were removed up to maximum 99%. Among the P, Cr, Zn and Pb elements accumulated on the aged catalyst surface, P, Cr and Zn element were removed up to 95%. But the Pb element were removed in the range of $10{\sim}30%$ of that of fresh catalyst.

• Proceedings of the Korean Nuclear Society Conference
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• 2005.10a
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• pp.1099-1100
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• 2005

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.731-734
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• 2005

In this study, the design of advanced LVDS(Low Voltage Differential Signaling) I/O interface circuit with new structural low triggering ESD (Electro-Static Discharge) protection circuit was investigated. Due to the differential transmission technique and low power consumption at the same time. Maximum transmission data ratio of designed LVDS transmitter was simulated to 5Gbps. And Zener Triggered SCR devices to protect the ESD phenomenon were designed. This structure reduces the trigger voltage by making the zener junction between the lateral PNP and base of lateral NPN in SCR structure. The triggering voltage was simulated to 5.8V. Finally, we performed the layout high speed I/O interface circuit with the low triggered ESD protection device in one-chip.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.805-808
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• 2005

In this study, the design of advanced LVDS(Low Voltage Differential Signaling) I/O interface circuit with new structural low triggering ESD(Electro-Static Discharge) protection circuit was investigated. Due to the differential transmission technique and low power consumption at same time. maximum transmission data ratio of designed LVDS transmitter was simulated to 5Gbps, Also, the LIGCSCR(Latch-up Immune Gate Coupled SCR)was designed. It consists of PLVTSCR (P-type Low Voltage Trigger SCR), control NMOS and RC network. The triggering voltage was simulated to 3.6V. And the latch-up characteristics were improved. Finally, we performed the layout high speed I/O interlace circuit with the low triggered ESD protection device in one-chip.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.469-470
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• 2003

질소산화물(NOx)은 대기오염물질이며, 우리나라 대기환경기준 설정항목중 6대 집중관리항목으로 취급되고 있다. 일반적으로 질소산화물에는 NO, NO$_2$, NO$_3$, $N_2$O, $N_2$O$_3$, $N_2$O$_4$, $N_2$O$_{5}$등이 존재하는 것으로 알려져 있으나, 대기중에서 검출되는 것은 $N_2$O, NO, NO$_2$ 등이며, 이 중에서 관리대상은 NO와 NO$_2$이다. 최근 정부에서는 질소산화물의 배출을 억제하기 위해 2005년 이후부터 배출허용기준을 대폭 강화할 것을 입법 예고하고 있다. (중략)

• Transactions of the Society of Information Storage Systems
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• v.1 no.2
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• pp.150-154
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• 2005

The effects of track format on the inter-track crosstalk of holographic ROM system are investigated. To quantify the effect of inter-track crosstalk for various track width and pitch, we defined Signal to Crosstalk noise Ratio(SCR) as a criterion. A numerical simulation is used to obtain the SCR as a function of track widths and pitches. We compared different 4 track widths having 0.3, 0.4, 0.5, and 0.6 ${\mu}m$ considering resolving power of lens and recording density. The simulation results show that the SCRs for each track width are maximized at the track pitch which has the value of 0.72, 0.72, 0.74, and 0.5 ${\mu}m$ respectively. Next, for the three sets with track width-pitch(0.4-0.72, 0.5-0.74, 0.6-0.8 ${\mu}m$) which showed the maximum SCR, we set a minimum pit length so that all sets have a DVD equivalent data density and compared RF signals passed from the slit. The simulation results show that when the track width, pitch, and minimum pit length have 0.5, 0.74, and 0.4 ${\mu}m$ respectively, the difference between the maximum and minimum value of the RF signal showed the greatest value. Also, we investigated RF signal in case of using an amplitude inversion mask, which transmitted regions are inversed against the conventional mask. The simulation results show that the better RF signal may be obtained by using an amplitude inversion mask.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.11a
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• pp.235-235
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• 2005

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.11a
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• pp.252-252
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• 2005