• Journal of Information Technology Applications and Management
• /
• v.13 no.1
• /
• pp.117-135
• /
• 2006

This research surveys how much firms are satisfied with the graduates of the MIS Department of C University. The subjects of this research are the graduates of the department who are working as full time workers and their supervisors, coworkers and subordinate workers evaluate how much they are satisfactory regarding their ability and knowledge to do their jobs successfully. The subjects are classified into IS practitioners and non-IS practitioners based on the tasks they are currently taking charge of. The results show that the IT - related part of the curriculum of the department provides a relative advantage for non-IS practitioners and that the management-related part of the curriculum provides a relative advantage for IS practitioners. The results also show that the curriculum does not provide the graduates enough technical proficiency to develop a successful carrier as IS specialists.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2009.10a
• /
• pp.192-195
• /
• 2009

We developed highly efficient blue PHOLEDs with reduced roll-off by using a mixed host structure. The balanced charge carrier injection and the distributed recombination zone within emissive layer resulted in a highly stable efficiency roll-off with quantum efficiencies of 20.1 and 18.1 % at a luminance of 1000 and 10000 cd/$m^2$.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2009.10a
• /
• pp.907-909
• /
• 2009

Low voltage operated top gated polymer transistors were fabricated with a high permittivity polymer, P(VDF-TrFE) and F8T2 as a gate dielectric and semiconducting layer, respectively. The operating voltage of transistors was effectively reduced under -10 V and typical threshold voltages were as low as -1 ~ -4 V with the reasonable charge carrier mobility of $10^{-3}cm^2$/Vs for the amorphous polymer. The large hysteresis in transfer curve was improved effectively by annealing at low temperature.

• Journal of Information Display
• /
• v.8 no.3
• /
• pp.11-16
• /
• 2007

Theoretical simulations of spatial distribution of charge carriers and recombination rate, and J-V characteristics of the multi-layer organic light emitting diodes are carried out. Drift-diffusion current transport, field-dependent carrier mobility, exponential and Gaussian trap distribution, and Langevin recombination models are included in this computer model. The simulated results show good agreement with the experimental data confirming the validity of the physical models for organic light emitting diodes.

• Journal of the Semiconductor & Display Technology
• /
• v.15 no.1
• /
• pp.70-75
• /
• 2016

GZO films prepared on ITO glasses were annealed at various temperatures in a vacuum condition to research the relationship between oxygen vacancies and optical properties. GZO films after annealing in a vacuum showed the various optical-chemical properties depending on the annealing temperatures and oxygen gas flow rate during the deposition. The oxygen vacancy of GZO film prepared by oxygen gas flows of 22 sccm increased with increasing the annealing temperatures, because of the extraction of oxygen by the annealing. But the intensity of photoluminance of GZO with 22 sccm decreased in accordance with the annealing temperature, because of the reduction of ionized charge carriers. The oxygen vacancy by the extraction of oxygen enhanced a depletion, so the widen depletion had the strong Schottky barrier and the PL intensity due to the low carrier density decreased.

• 전기의세계
• /
• v.26 no.4
• /
• pp.68-72
• /
• 1977

The main purpose of this paper is to study on the nature of the traps in polymer. The polyethlene is typical of polymer material as to be selected for a sample. The current I$_{th}$ are obtained with an small external bias voltage from high density polyethylene which have been treated by the high-field application. Two peaks, P$_{1}$ and P$_{2}$ with maxima near 85.deg. C, respectively, appeared on the current I$_{th}$ spectrum. From the results of experiment, It is clear that The current I$_{th}$ arises from the drift, under the external field, of carriers released from the trap sites by the heating and the trap is surrounded by a potential barrier and trapping proceeds during the high-field treatment. The obtained results can suggest that polyethylene contains trap sites which have an important role in the electrical conduction and breakdown of polymeric materials.rials.

• Ceramist
• /
• v.21 no.1
• /
• pp.24-43
• /
• 2018

Organic-inorganic halide perovskite materials have attracted significant attention during the last few years because of their superior properties for electronic and optoelectronic devices, such as their long charge carrier diffusion lengths and high photoluminescence quantum yields of up to 100% with tunable bandgaps over the entire visible spectral range. In addition to solar cells, light emitting diodes (LEDs) represent a fascinating application for halide perovskite materials. In this study, we review the recent progress in halide perovskite LEDs. The current strategies for improving the performance of halide LEDs, focusing on morphological engineering, dimensional engineering, compositional engineering, surface passivation, interfacial engineering, and the plasmonic effect are discussed. The challenges and perspectives for the future development of halide perovskite LEDs are also considered.

• Proceedings of the KIEE Conference
• /
• 1987.07a
• /
• pp.461-464
• /
• 1987

With the fabrication of Al-$Al_2O_3$-n(p) type Si devices, the analysis and measurement of various characteristics, this study presented the electric physical property theory for the charge distribution of MAS device $Al_2O_3$ films, and inquired out the devices available. In order to study them, Al-(450A)$Al_2O_3$-n(p) type Si was the main objects in the study. They were examined through carrier injection, C-V curves of devices on time, ${\Delta}V_{FB}$-t curves, I-V curves and $Al_2O_3$ film's breakdown characteristics.

• Proceedings of the KIPE Conference
• /
• 2017.07a
• /
• pp.212-213
• /
• 2017

In this paper is presented a pre-charging sequence for single-phase cascaded neutal-point-clamped(NPC) converters for capacitors voltage balancing. capacitor imbalance problem in pre-charge sequence is caused in cascaded NPC converter by its topology. the DC link voltage at each NPC converter module can be balanced by the proposed switching method. the design and performance of the proposed sequence are verified by simulation and experimental results using prototype.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2015.05a
• /
• pp.102-102
• /
• 2015

지구상 존재하는 화석연료의 고갈에 대한 우려와 함께 최근 들어 지구 온난화로 인해 야기되고 있는 심각한 지구환경 문제에 대한 관심이 고조되고 있다. 이산화탄소로 대표되는 지구 온난화를 일으키는 공해물질의 많은 부분이 현재 주에너지원으로 사용되는 화석연료에 기인하기 때문에 이를 대체할 수 있는 청정에너지 개발은 이미 세계적 당면 과제라고 할 수 있다. 그 중, 수소에너지는 청정에너지로써의 역할 뿐만 아니라 에너지 저장매체로써의 기능 또한 담당할 수 있어 주목 받고 있다. 본 연구에서는 텅스텐 광촉매를 사용하여 물을 수소와 산소로 분해 하고자 하였고 C70을 도입하여 분해 효율을 향상시키고자 하였다.