• Proceedings of the KSME Conference
• /
• 2004.11a
• /
• pp.737-742
• /
• 2004

In this paper, a family of decentralized adaptive controller is proposed to control robot manipulators which are governed by highly nonlinear dynamic equations. The controller is computationally efficient since it does not require mathematical model or parameter values of the manipulators. The stability of the manipulators with the controller is proved by Lyapunov theory. The results of numerical simulations show that the system is stable, and has excellent trajectory tracking performance.

• Communications for Statistical Applications and Methods
• /
• v.13 no.3
• /
• pp.745-754
• /
• 2006

It has been shown that LAD estimates are more efficient than LS estimates when the error distribution is double exponential in AR(1) model. In order to explore the performance of LAD estimates one can use bootstrap approaches. In this paper we consider the efficiencies of bootstrap methods when we apply LAD estimates with highly variable data. Monte Carlo simulation results are given for comparing generalized bootstrap, stationary bootstrap and threshold bootstrap methods.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1995.10a
• /
• pp.720-723
• /
• 1995

As a part of the configuration design expert system of machine tools, inference mechanisms are constructed in this paper. In addition to procedural inference, the method of multivariable inference is considered as an efficient approach to deal with the cases of highly coupled condition. We propose a generalized multivariable inference procedure. The procedure is applied to the type selection module of the configuration design expert system of machine tools in order to demonstrate the efficiency and validity.

• 한국신재생에너지학회:학술대회논문집
• /
• 2006.11a
• /
• pp.9-14
• /
• 2006

Open loop or ground water heat pump systems are the oldest of ground-source systems. Standing column wells can be used as highly efficient ground heat exchanger in geo-thermal heat pump systems, where hydrological and geological conditions are suitable. These systems require some careful considerations for well design, ground water flow, heat exchanger selection etc This paper describes 9round water temperature variations, performances in heat ins and cool ing mode and the results of ground water analysis.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08b
• /
• pp.1580-1582
• /
• 2007

The composites were fabricated with titania used commercially and calcite as a filler in BZB glass matrix and their thermal, optical and electrical properties were investigated. From our results, calcite may be the profitable and highly efficient reflectance material as a filler for flat panel display devices.

• Proceedings of the PSK Conference
• /
• 2003.04a
• /
• pp.250.3-251
• /
• 2003

A series of cinchona alkaloid-derived dimeric quaternary ammonium salts were prepared as chiral phase-transfer catalysts by the introduction of various functional groups on the phenyl ligand. Among them. the 2-F-substituted derivative 21 showed the highest enantioselectivity in the alkylation of the glycine anion equivalent 1 (97->99 ％ ee).

• Bulletin of the Korean Chemical Society
• /
• v.29 no.1
• /
• pp.47-50
• /
• 2008

The diastereoselectivity of Diels-Alder reactions were studied on the silica surface supported with different concentrations of cerium ion as efficient Lewis acid catalysts under solvent-free conditions. The results showed that the diastereoselectivity of reaction was highly improved in these conditions. The cerium ion was grafted on silica surface by using ion exchange method.

• Proceedings of the Optical Society of Korea Conference
• /
• 2005.02a
• /
• pp.60-61
• /
• 2005

• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07b
• /
• pp.1044-1045
• /
• 2005

Rapid progress has been achieved towards commercially viable full color polymer OLED devices. New full color polymer OLED displays which incorporate a novel hole injecting-transporting layer show high efficiency, low operating voltage and long lifetimes. The performance of a 14.1" WXGA a-Si based solution processed AMOLED full color display is described.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2010.06a
• /
• pp.156-156
• /
• 2010

We have developed highly efficient blue phosphorescent organic light-emitting devices (OLED) with simplified architectures using blue phosphorescent material. The basis device structure of the blue PHOLED was anode / emitting layer (EML) / electron transport layer (ETL) / cathode. The dopant was partially doped into the host layer for investigating recombination zone, current efficiency, and emission characteristics of the blue PHOLEDs.