• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.105-105
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• 2012

We have developed a photoemission-assisted plasma-enhanced chemical vapor deposition (PAPE-CVD) [1,2], in which photoelectrons emitting from the substrate surface irradiated with UV light ($h{\nu}$=7.2 eV) from a Xe excimer lamp are utilized as a trigger for generating DC discharge plasma as depicted in Fig. 1. As a result, photoemission-assisted plasma can appear just above the substrate surface with a limited interval between the substrate and the electrode (~10 mm), enabling us to suppress effectively the unintended deposition of soot on the chamber walls, to increase the deposition rate, and to decrease drastically the electric power consumption. In case of the deposition of DLC gate insulator films for the top-gate graphene channel FET, plasma discharge power is reduced down to as low as 0.01W, giving rise to decrease significantly the plasma-induced damage on the graphene channel [3]. In addition, DLC thickness can be precisely controlled in an atomic scale and dielectric constant is also changed from low ${\kappa}$ for the passivation layer to high ${\kappa}$ for the gate insulator. On the other hand, negative electron affinity (NEA) of a hydrogen-terminated diamond surface is attractive and of practical importance for PAPECVD, because the diamond surface under PAPE-CVD with H2-diluted (about 1%) CH4 gas is exposed to a lot of hydrogen radicals and therefore can perform as a high-efficiency electron emitter due to NEA. In fact, we observed a large change of discharge current between with and without hydrogen termination. It is noted that photoelectrons are emitted from the SiO2 (350 nm)/Si interface with 7.2-eV UV light, making it possible to grow few-layer graphene on the thick SiO2 surface with no transition layer of amorphous carbon by means of PAPE-CVD without any metal catalyst.

• Applied Chemistry for Engineering
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• v.10 no.7
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• pp.974-978
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• 1999

This study was concerned with the scouring effect of anionic surfactants, PAPE(sodium polyoxyethylene alkyl phosphoric ester) for cotton fibres. Sodium polyoxyethylene(7) nonylphenyl phosphoric ester(CPB-1) and the sodium polyoxyethylene(7) tridecyl phosphoric ester(CPB-2) were synthesized by the phosphoric esterification reaction from NP-7(polyoxyethylene(7) nonylphenyl ether) and TDA-7(polyoxyethylene(7) tridecyl ether) as scouring agents. Defoaming ability, fibre wetting time and absorbency rate of scouring agents were investigated. Being compared with the conventional scouring agent(Ultravon GP; Ciba-guyge Co.), CPB-1 and CPB-2 showed a higher defoaming ability in the cotton scouring process at room temperature. And CPB-1 has a higher wetting effect than the agents, CPB-2 or GP in distilled water bath but CPB-2 showed more scouring effect in 1.2 wt % NaOH solution bath.

• Journal of Korea Technology Innovation Society
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• v.3 no.1
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• pp.127-138
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• 2000

This pape applies the multi-attribute utility theory for estimating the non-economci value of technology. The technology of the code division multiple access in mobile communications is used as a case study. The technology of the code division multiple access in mobile communications is used as a case study. The result shows that the multi-attribute utility theory is a useful method for es-tinmating the non-economic value of technology and gaining an insight into the importance of tech-nology innovation.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.230-233
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• 1999

The design and implementation of thyristor water cooling control systems in considered in this pape Coolant water is pumped through the thyristor heat sinks where heat is transferred from the thyristo to the water. This water is then pumped through outdoor air-to-water heat exchangers where heat I transferred to the outside air. Since the water must be pure, it is filtered and de-ionized. Also the water temperature must be below dew-point temperature. Redundant pumps, outdoor heat exchangers, power supply system, controller monitoring system are provided for system reliability and availability.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.690-692
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• 2012

This pape presents the efficient test data compression method considering test power dissipation in scan test of IP core. There are many researches about test data compression using scan slice selective encoding except power dissipation. We present the new algorithm that assigns the don't care value to be a minimal hamming distance between adjacent slices. Experimental results show that the power dissipation is reduced.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.876-879
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• 1995

Parallel NC machines are a new generation of machine tools aimed at increasing maching accuracy and reducing part cycle time. In addition to their capacity to perform both milling and turning operations, these machine tools can perform multiple machining operations simultaneously,involving one or more parts at a time, and can completely finish a part in a single setup. Due to the lack of a computer-aided process planning system, these machines are used in industry today as dedicated, mass-production machines. This pape presents methodology for generating optimal process plan for each parallel machine tool using a genetic algorithm.

• Bulletin of the Korean Mathematical Society
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• v.43 no.3
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• pp.619-626
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• 2006

Let m be any positive integer, R be a ring with identity, $M_m(R)$ be the matrix ring of all m by m matrices eve. R and $G_m(R)$ be the multiplicative group of all n by n nonsingular matrices in $M_m(R)$. In this pape., the following are investigated: (1) for any pairwise coprime ideals ${I_1,\;I_2,\;...,\;I_n}$ in a ring R, $M_m(R/(I_1{\cap}I_2{\cap}...{\cap}I_n))$ is isomorphic to $M_m(R/I_1){\times}M_m(R/I_2){\times}...{\times}M_m(R/I_n);$ and $G_m(R/I_1){\cap}I_2{\cap}...{\cap}I_n))$ is isomorphic to $G_m(R/I_1){\times}G_m(R/I_2){\times}...{\times}G_m(R/I_n);$ (2) In particular, if R is a finite ring with identity, then the order of $G_m(R)$ can be computed.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1631-1633
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• 2008

We demonstrate 4-in QVGA active-matrix electrophoretic display based on ink-jet printed organic transistors on glass substrates. Our TFT array had a bottom-gate, bottom-contact device architecture. The organic semiconductor and gate dielectric were solution processed. The field-effect mobility of the printed devices, calculated in the saturation region, was $0.1{\sim}0.3cm^2/Vs$ at Vg=-20 V.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.29A no.2
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• pp.100-106
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• 1992

In this pape, we designed and implemented a hardware accelerator for the generation of bit map font from Hangul outline font description for LBP (Laser Beam Printer) and screen applications Whole system was implemented as a double size PC/AT application board which consists of processing bolck and display block. The processing block has a master processor (MC68000)and two slave processors which are MC56001 and KAFOG chip responsible for the short vector generation. In the display block, TMS34061 was used for monitor display and GP425 was used for LBP print out. The resolution of the monitor is 640$\times$480 and that of LBP is 2385$\times$3390. The current system called KHGB90-B generates about 100 characters per second where each character consists of 32$\times$32 bits

• Journal of the Korean Institute of Telematics and Electronics A
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• v.31A no.7
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• pp.117-124
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• 1994

In this pape, we propose a graph-theoretic approach for solving the allocation problem for the synthesis of datapaths based on multiport memories. An efficient algorithm is devised by using the weighted bipartite matching algorithm to assign variables to each port of memory modules. The proposed algorithm assigns program variables into a minimum number of multiport memory modules such that usage of memory elements and interconnection cost can be kept minimal. Experimental results show that the proposed algorithm generates the datapaths with fewer registers in memory modules and less interconnection cost for several benchmarks available from the literatures.