Won Bae Kim

Different nanostructures (Ns), such as nanobelts, nanobricks and nanosheets, of polypyrrole (PPy) were successfully fabricated on stainless steel substrates by simply varying the scan rate of deposition in the potentiodynamic mode. These PPy Ns were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and surface area measurement. The XRD analysis showed the formation of amorphous

SQL is a high-level nonprocedural data language which has received wide recognition in relational databases. One of the most interesting features of SQL is the nesting of query blocks to an arbitrary depth. An SQL-like query nested to an arbitrary depth is shown to be composed of five basic types of nesting. Four of them have not been well understood and more work needs to be done to improve their execution efficiency. Algorithms are developed that transform queries involving these basic types o

I. NEXT-GENERATION DATABASE TECHNOLOGY. 1. Introduction to Part 1: Next-Generation Database Technology. 2. The OMG Model. 3. Object SQL---Language for the Design and Implementation of Object Databases. 4. OQL(C++): Extending C++ with an Object Query Capability. 5. C++ Bindings to an Object Database. 6. On View Support in Object-Oriented Database Systems. 7. Authorization in Object-Oriented Databases. 8. Query Processing in Object-Oriented Database Systems. 9. Physical Object Management. 10. Requ

Electricity was produced by catalytic oxidation of carbon monoxide (CO) by using gold catalysts at room temperature. The observed rates are faster than conventional processes operating at 500 kelvin or higher for the conversion of CO with water to produce hydrogen and carbon dioxide through the water-gas shift (WGS). By eliminating the WGS reaction, we remove the need to transport and vaporize liquid water in the production of energy for portable applications. This process can use CO-containing

In object-oriented systems, an object may recursively reference any number of other objects. The references, however, do not capture any special relationships between objects. An important semantic relationship which may be superimposed on a reference is the IS-PART-OF relationship between a pair of objects. A set of objects related by the IS-PART-OF relationship is collectively called a composite object. An earlier paper [KIM87b] presented a model of composite objects which has been implemented

Abstract Recently our modern society is demanding flexible, low‐cost, and lightweight electrochemical energy storage systems, which are very important in variety of applications ranging from portable consumer electronics to large industrial‐scale power and energy management. Among different energy storage systems, flexible supercapacitors have been considered as one of the most promising candidates due to their significant merits such as high power density along with the unique properties of bei

A surfactantless, one-pot reduction approach for Pd@Pt core–shell nano-stars on reduced graphene oxide with enhanced catalytic activity and stability for methanol oxidation in alkaline media.

The PtSb/C catalyzed highly selective transformation of glycerol to dihydroxyacetone and H₂ was achieved by controlling the applied electrode potential without using oxidants <italic>via</italic> an electrocatalytic reactor system in acidic media.