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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Chosun Natural Science
Journal Basic Information
Journal DOI :
The Research Institute of Chosun Natural Science
Editor in Chief :
Volume & Issues
Volume 2, Issue 4 - Dec 2009
Volume 2, Issue 3 - Sep 2009
Volume 2, Issue 2 - Jun 2009
Volume 2, Issue 1 - Mar 2009
Selecting the target year
Electrochemical Corrosion Behaviors of Amorphous
Kim, Hyun-Goo ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 233~236
This study was undertaken to measure the electrochemical corrosion of amorphous
(at.%) alloy ribbon under various conditions, including 0.4 mM HCl solution, and for various values of the pH and the immersion time. The corrosion potentials(
) for the amorphous
alloy in 0.4 mM HCl decreased with increasing temperature; the corrosion current density(
) increased with increasing temperature in general. The polarization resistance(
) was inversely proportional to the corrosion rate. While pH=7, 9, 11 was not as sensitive as pH=3, 5, pH=3 was more sensitive for amorphous
alloy than other pHs specially. The change of mass in the 70 mM
solution with immersion time was the greatest in the first 100 h.
A module of Semitransparent Dye-sensitized Solar Cell
Kang, Man Gu ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 237~242
As semitransparent dye-sensitized solar cells (DSSCs) have advanced to large-scale applications from lab-level research, the large-scale performance has attracted much attention. Modules of DSSCs have been investigated to optimize the efficiency as a
systhesis temperature and a surface treatment of
aqueous solution. Essentially, these semitransparent modules have an extended structure with lab-scale works with the exception of the dimensions and methods for the series connection. The
modules have shown an efficiency of about 6% without a scattering layer. While the fill factors of modules depend on the width of each
unit cell, they are much less dependent on the lengths of the unit cells.
A Syudy on the Biomedical Information Processing for Biomedicine and Healthcare
Jeong, Hyun-Cheol ; Park, Byung-Jun ; Bae, Sang-Hyun ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 243~251
This paper surveys some researches to accomplish on bioinformatics. These researches wish to propose a database architecture combining a general view of bioinformatics data as a graph of data objects and data relationships, with the efficiency and robustness of data management and query provided by indexing and generic programming techniques. Here, these invert the role of the index, and make it a first-class citizen in the query language. It is possible to do this in a structured way, allowing users to mention indexes explicitly without yielding to a procedural query model, by converting functional relations into explicit functions. In the limit, the database becomes a graph, in which the edges are these indexes. Function composition can be specified either explicitly or implicitly as path queries. The net effect of the inversion is to convert the database into a hyperdatabase: a database of databases, connected by indexes or functions. The inversion approach was motivated by their work in biological databases, for which hyperdatabases are a good model. The need for a good model has slowed progress in bioinformatics.
Technology Trends for Photoresist and Research on Photo Acid Generator for Chemical Amplified Photoresist
Kim, Sung-Hoon ; Kim, Sang-Tae ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 252~264
Lithographic data obtained from PHS(polyhydroxy styrene) having various functionalities were investigated by using a photoacid generator based on diazo and onium type. Chemically amplified photoresist based on the KrF type photoresist was developed by using a photoacid generator and multi-functional resin. Thermal stability for the photoacid generator showed that the increase of loading amount of photoacid generator resulted in the decrease of glass transintion temperature (Tg). The photoacid generators having methyl, ethyl, or propyl group in their cationic structure produced T-top structure in pattern profile due to the effect of acid diffusion during the generation of acid in the resist. The increase of carbon chain length in the anionic structure of photoacid generators resulted in lower pattern resolution due to the interruption of acid diffusion.
Formation of Charged Exciton in GaAs-AlGaAs Double-Quantum-Well Structure at High Magnetic Field
Kim, Yong Min ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 265~269
The photoluminescence was measured in GaAs-AlGaAs double-quantum-well structure at high magnetic field. Although the phototransition characteristics displayed a free-particle transition at low magnetic field, the change of free-particle transition into bound-exciton transition was observed at high magnetic field (above 10 T). A charged exciton formation due to charge-unbalanced electron-hole was identified by using a spin-polarized photoluminescence method. An increase of exciton formation due to the localization of free-particle at magnetic field was observed according to the increase of magnetic field.
Synthesis and Optical Characterization of 2,5-Dibromo-3,4,6,7,8,9-hexaphenyl-1-silaspiropenta-2,4,6,8-tetraene
Park, Jaehyun ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 270~274
Organometallic polymers containing spirosilole unit have been interested, since spirosiloles has a unique optical and electronic properties. New functionalized spirosiloles (2,5-dibromo-3,4,6,7,8,9-hexaphenylspirosilole, DBHPSS) have been synthesized from the reduction of bis(1,1-phenylethynyl)-2,3,4,5-tetraphenylsilole with lithium naphthalenide for the possible applications in optics. DBHPSS has been characterized by
-NMR, fluorescence, and UV-vis absorption spectroscopy and elemental analysis. Bis(phenylethynyl)tetraphenylsilole displays an emission maxima at 490 nm with an excitation wavelength of 380 nm. However, DBHPSS displays an emission maxima at 550 nm with an excitation wavelength of 420 nm.
Detection of Voletile Organic Compounds by Using DBR Porous Silicon
Park, Cheol Young ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 275~279
Recently, number of studies for porous silicon (PSi) have been investigated by many researchers. Multistructured porous silicon such as a distributed Bragg reflector (DBR) PSi, has been a topic of interest, because of its unique optical properties. DBR PSi were prepared by using an electrochemical etch of
-type silicon wafer with resistivity between 0.1 and
. The electrochemical etch with square wave current density results in two different refractive indices in the porous layer. In this work, DBR porous silicon chips for a simple and portable organic vapor-sensing device have fabricated. The optical characteristics of DBR PSi have been investigated. DBR porous silicon have been characterized by FT-IR and Ocean optics 2000 spectrometer. The device used DBR PSi chip has been demonstrated as an excellent gas sensor, showing a great senstivity to organic vapor at room temperature.
A Versatile Methods for Synthesis of Graphene Sheets from Graphite
Jang, Seunghyun ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 280~284
The unique electronic property of graphene sheets provides potential applications in nanocomposites and fabricating various nicroelectrical devices, such as field-effect transistors, ultrasensitive sensors, and electromechanical resonators. Several effective techniques have been developed for preparing graphene sheets. Among these technique, mechanical exfoliation can produce pure graphene and epitaxial graphene sheets have been prepared by treatment of silicon carbide wafers at high temperature. Recently, graphene sheets have been developed by chemical reduction method from graphene oxide. In this work, we have synthesized graphene sheets based on mechanical exfoliation and chemical reduction methods. Graphene sheets were characterized by field-effect scanning electron microscope (FE-SEM). The size of graphene sheets was from few hundreds nanometer to decades micrometer.
One-pot Synthesis of CdS Nanoparticles by Using
Precusor and Their Optical Characteristics
Jang, Seunghyun ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 285~288
A synthetic route for 12 metal thiocarboxylate complex,
[Lut = 3,5-dimethylpyridine (lutidine)], were investigated for their potential to act as precursors for the formation of cadmium sulfide nanoparticles.
were characterized by 1H-NMR spectroscopy. Thermal decomposition of
is expected to undergo thiocarboxylic anhydride elimination to give stoichiometric cadmium sulfide nanoparticles and removes the organic supporting ligands cleanly. Prepared cadmium sulfide nanoparticles were characterized by fluorescence and UV-vis absorption spectroscopy and displayed an emission band at 500 nm with an excitation wavelength of 360 nm.
Development of Synthetic Route for Perchlorocyclopentasilane and Its Optical Characterization
Han, Joungmin ;
Journal of the Chosun Natural Science, volume 2, issue 4, 2009, Pages 289~292
Perchlorosilanes are useful precursors for the synthesis of hydrosilanes for the fabrication of electronic devices such as silicon thin-film transistors and silicon nanoparticles. For this solution process, requirements of precursors applicable to solution process are relatively low volatile and soluble in common organic solvents. In this work, the decaphenylcyclopentasilane has been obtained from the reaction of the lithium wire and dichlorodiphenylsilane. The reaction of decaphenylcyclopentasilane with lewis acid catalyst, HCl/
, gives the perchlorocyclopentasilane. Decaphenylcyclopentasilane exhibits an unusual optical property. Its optical property was characterized by UV-vis and fluorescence spectroscopy. Absorption wavelength maxima for the decaphenylcyclopentasilane was 272 nm. Decaphenylcyclopentasilane displayed an emission band at 741 nm with excitation wavelength of 272 nm.