• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08b
• /
• pp.1348-1351
• /
• 2007

We demonstrated that the threshold voltage shift owing to a gate-bias stress is originated from the trapped charges at the interface between semiconductor layer and dielectric layer, and such drawback can be settled by applying long-term delay time to the gate electrode.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08b
• /
• pp.1464-1466
• /
• 2007

We demonstrate p-doped organic light emitting diodes (OLEDs) comprising tungsten oxide ($WO_3$) and 1,4-bis[N-(1-naphthyl)-N'-phenylamino]-4,4' diamine (NPB). We propose the NPB : $WO_3$ composition functions as a p-doping layer which significantly improves hole injection that leads to the fabrication of 4-(dicyano-methylene)-2-methyl-6-(p-dimethylaminos tyryl)-4H-pyrane (DCMl) based p-doped OLEDs with high efficiency and long lifetime.

• Journal of Information Management
• /
• v.41 no.2
• /
• pp.71-93
• /
• 2010

This study firstly considered the changing processes of the 'guideline on dealing with restricted materials and information' which had been theoretical background for understanding the dealing situations of materials and information on North Korea. Additionally, this study investigated material possessions which were located in restricted-materials-dealing institutions affiliated with Ministry of Unification and Ministry of Education, Science and Technology, and also researched using results of the materials. Through the investigation analysis and precedent studies, problems caused by poor material using conditions were found and institutional developing plans were sought. In particular, this study suggested that 'the Interchange Council for North Korean Information and Materials' be constructed as a general management organization which controls many problems caused by using and treating materials and information on North Korea and cooperative models that can lead organic connection among all institutions for dealing with restricted materials and information.

• Bulletin of the Korean Chemical Society
• /
• v.30 no.7
• /
• pp.1625-1627
• /
• 2009

• Proceedings of the Korean Vacuum Society Conference
• /
• 1997.07a
• /
• pp.37-38
• /
• 1997

• 한국정보디스플레이학회:학술대회논문집
• /
• 2006.08a
• /
• pp.1386-1389
• /
• 2006

In this study, a plasma flat fluorescent lamp having a new structure was fabricated by screen printing technique. Coplanar types of silver electrodes with a dielectric layer were screen-printed on a rear glass plate, and then fired at $550^{\circ}C$ and $580^{\circ}C$, respectively. Phosphor was spin-coated on the dielectric layer with firing at $490^{\circ}C$. Several types of lamps were designed and its properties wee investigated with electrode shape, gas pressure, etc.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2009.11a
• /
• pp.26.1-26.1
• /
• 2009

A simple route of external mechanical force is presented for enhancing the electrical properties of polymer nanocomposite consisted of nanowires. By dispersing ZnO nanowires in polymer solution and drop casting on substrates, nanocomposite transistors containing ZnO nanowires are successfully fabricated. Even though the ZnO nanowires density is properly controlled for device fabrication, as-cast device doesn't show any detectable currents, because nanowires are separated far from each other with the insulating polymer matrix intervening between them. Compared to the device pressed at 300 kPa, the device pressed at 600 kPa currents increased by 50times showing the linear behavior against drain voltage and exhibits promising electrical properties, which operates in the depletion mode with higher mobility and on-current. Such an improved device performance would be realized by the contacts improvement and the increase of the number of electrical path induced by external force. This approach provides a viable solution for serious contact resistance problem of nanocomposite materials and promises for future manufacturing of high-performance devices.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2004.06a
• /
• pp.3-4
• /
• 2004

• The KIPS Transactions:PartD
• /
• v.16D no.3
• /
• pp.433-440
• /
• 2009

As information technology of constructional area develops recently, web-based on-line system is rapidly increasing to provide information on diverse constructional materials so as to enhance productivity of constructional business and to reduce cost. Since the constructional materials information provided by these systems, i.e., quality, specification, etc are not standardized, however, the staffs on the constructional site suffer considerable difficulties in using materials information when acquiring information on specific materials, e.g., using diverse information systems or repeating similar jobs. Thus, this research typified information items of constructional materials on the basis of GDAS and designed multi system model to control integrated information on constructional materials. This system can efficiently control and utilize materials information by supporting automatic classification of constructional materials to which OmniClass Part-22 and UNSPSC are applied, conditional complex retrieval of materials information, real-time automatic embodiment of electronic catalog and retrieving/controlling RFID.

• Current Applied Physics
• /
• v.18 no.11
• /
• pp.1422-1425
• /
• 2018

$NaTa_{1-x}Fe_xO_3$ ($0{\leq}x{\leq}0.40$) nanocubes were synthesized by a relatively low temperature hydrothermal method, using $Ta_2O_5$, $FeCl_3$ and NaOH as the precursors. The UV-vis diffuse reflectance spectra showed that $NaTa_{1-x}Fe_xO_3$ had significant visible-light-absorbing capability, and the absorption edge of $NaTaO_3$ shifted to longer wavelength with the increase of Fe dopants. Moreover, $NaTa_{1-x}Fe_xO_3$ exhibited room-temperature ferromagnetism when $Fe^{3+}$ occupied $Ta^{5+}$ sites in $NaTaO_3$ crystal lattice. The ferromagnetism is mainly attributed to the superexchange interactions between doped $Fe^{3+}$, rather than the contribution of oxygen vacancies caused by Fe doping. Therefore, Fe doping can simultaneously regulate the optical and magnetic properties of $NaTaO_3$ semiconductor, which will enable its potential applications in multifunctional optical-electronics and opticalspintronics devices.