• The Transactions of the Korean Institute of Electrical Engineers P
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• v.51 no.3
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• pp.132-136
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• 2002

In this study, we analyzed the luminous efficiencies of Ne-Xe-Ar and He-Ne-Xe-Ar mixing gas in compared with those of Ne-Xe and He-Ne-Xe mixing gas to improve luminous efficiency by adding a small amount of Ar gas. At the Xe 4%, the brightness of Ne-Xe and He-Ne-Xe mixing gas is higher than others. As the Xe % increases, power consumption decreases. Thus, in the Ne-Xe and He-Ne-Xe mixing gas of Xe 4%, we obtained maxium luminous efficiency. The Ar concentration is varied from 0.1% to 0.7% in this study. The luminous efficiency of the Ne-Xe(4%) mixing gas is improved to 1.16 and 1.13 lm/W by adding an Ar concentration of 0.4% and 0.5%, respectively. The luminous efficiency of the He-Ne-Xe(4%) (He : Ne = 7 : 3) mixing gas is considerably improved by adding an Ar concentration of above 0.3%. The maximum luminous efficiency of this mixing gas is 1.38 lm/W at the condition of adding an Ar concentration of 0.5%.

• Journal of Digital Contents Society
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• v.15 no.6
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• pp.737-743
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• 2014

For single image super resolution (SR), interpolation based and example based algorithms are extensively used. The interpolation algorithms have the strength of theoretical simplicity. However, those algorithms are tending to produce high resolution images with jagged edges, because they are not able to use more priori information. Example based algorithms have been studied in the past few years. For example based SR, the nearest neighbor based algorithms are extensively considered. Among them, neighbor embedding (NE) has been inspired by manifold learning method, particularly locally linear embedding. However, the sizes of local training sets are always too small. So, NE algorithm is weak in the performance of the visuality and quantitative measure by the poor generalization of nearest neighbor estimation. An improved NE algorithm with Support Vector Regression (SVR) was proposed to solve this problem. Given a low resolution image, the pixel values in its high resolution version are estimated by the improved NE. Comparing with bicubic and NE, the improvements of 1.25 dB and 2.33 dB are achieved in PSNR. Experimental results show that proposed method is quantitatively and visually more effective than prior works using bicubic interpolation and NE.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.8
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• pp.2666-2687
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• 2022

As a new alternative communication scheme in 5G, unmanned aerial vehicle (UAV) is used as a relay in the remote base station (BS) for assistant communication. In order to ameliorate the quality of the backhaul link, a UAV backhaul transmission scheme based on improved Nash equilibrium (NE) strategy is proposed. First, the capacity of air-to-ground (A2G) channel by the link preprocess is maximized. Then, the maximum utility function of each UAV is used as the basis of obtaining NE point according to the backhaul channel and the backhaul congestion. Finally, the improved NE strategy is applied in multiple iterations until maximum utility functions of all the UAVs are reached, and the UAVs which are rejected by air-to-air (A2A) link during the process would participate in the source recovery process to construct a multi-hop backhaul network. Simulation results show that average effective backhaul rate, minimum effective backhaul rate increases by 10%, 28.5% respectively in ideal A2G channel, and 11.8%, 42.3% respectively in fading channel, comparing to pure NE strategy. And the average number of iterations is decreased by 5%.

• Proceedings of the Optical Society of Korea Conference
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• 2005.02a
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• pp.328-329
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• 2005

• Proceedings of the KIEE Conference
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• 1998.11c
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• pp.919-921
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• 1998

In Color AC Plasma Display Panel(PDP). Low luminous efficiency is a major problem. We measured luminous efficiency of PDP as a function of the Ar mixing ratio. Our results show that efficiency has improved by $5{\sim}10%$ at the condition of 0.5% Ar mixing ratio, compared with Ne-Xe(4%) or He-Ne-Xe(4%) (He:Ne = 7:3) gas.

• 한국정보디스플레이학회:학술대회논문집
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• 2000.01a
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• pp.27-28
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• 2000

We examined ($He_x-Ne_{l-x}$)-Xe gas discharge in an AC PDP cell by computer simulation to understand the gas mixing effects. The breakdown and sustain voltage were significantly lowered with the addition of Ne into He-Xe. The luminance and efficiency in ($He_x-Ne_{l-x}$)-Xe also improved when compared with the He-Xe or Ne-Xe gas mixture. The luminance is maximum around $30{\sim}40%$ He addition, while the efficiency shows peak values at 70% He. Two-dimensional numerical simulation was done to explain these results.

• Korean Journal of Community Nutrition
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• v.28 no.1
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• pp.24-37
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• 2023

Objectives: This study aimed to investigate the current status of nutrition education via a free learning semester program (NE). The understanding of the program, the potential difficulties, and future initiatives for NE improvement were also investigated. Methods: A total number of 161 nutrition teachers from Gwangju and Jeonnam filled in a questionnaire and participated in this survey, which was performed from July to August 2019. Results: Our results showed that 8.1% of the nutrition teachers had taught nutrition education in free learning semester programs. The most frequently implemented model was subject selection, followed by club activities. Most of the nutrition teachers comprehended the purpose of NE. The attitude of nutrition teachers to NE differed by the understanding of its purpose. Positive attitude was evident due to a better understanding of the purpose by nutrition teachers. Nutrition teachers reported the most common difficulties of NE were the lack of preparation due to the heavy workload and the lack of a standard running program. The most effective method of NE was the activity classes. The experience of practicing NE influenced the choice of contents for each operating model. Nutrition teachers that were experienced in NE conducted via free learning semester programs preferred the selected topics model, but those without experience chose the career search model. Conclusions: Although some obstacles exist, nutrition teachers had a positive attitude and perceived well the importance of NE. Therefore, the awareness for the significance of NE of nutrition teachers needs to be improved. For better NE practice, it is necessary to reduce/ manage the workload of general food service. Furthermore, the development of standard running and promotion programs, and teacher training programs should be ensured.

• Journal of the Korean Vacuum Society
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• v.11 no.2
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• pp.127-134
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• 2002

Recently, Plasma display panel(PDP) has been in the spotlight as one of the next generation flat-panel-display device. The luminance and luminous efficiency improvement is the hot issues for making a plasma display into a large flat panel device. In this paper, We suggest a new penning gas mixture, in order to find the optimum mixture gas in plasma display panel. The optimum gas composition has been found by the partial pressure of inert gases(such as Af and Kr added to matrix of He(70%)-Ne(27%)Xe(3%) and Ne(96%)-Xe(4%)). The influences of Ar or Kr addition to Ne(96%)-Xe(4%) and He(70%)-Ne(27%)-Xe(3%) mixture gases are experimentally investigated for AC Plasma Display Panel. When rare As(0.01%-0.03%) or Kr(0.01%-0.03%) is added Ne-Xe and He-Ne-Xe mixture gases, the luminance increases over 10%-20% and luminous efficiency increases over 10%-20% at 200 Torr. It is sure that luminance and efficiency are improved by Penning effect. Also, This influence of Penning effect is shown by increased wall charge(10%-25%). In addition to the result, firing voltage and minimum sustain voltage was approximately decreased by 2V-3V.

• Journal of Positioning, Navigation, and Timing
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• v.13 no.1
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• pp.63-73
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• 2024

NeQuick G is the ionosphere model utilized by Galileo single-frequency users to estimate the ionospheric delay on each user-satellite link. The model is characterized by the effective ionization level (Az) index, determined by a modified dip latitude (MODIP) and broadcast coefficients derived from daily global space weather observations. However, globally fitted Az coefficients may not accurately represent ionosphere within local area. This study introduces a method for regional ionospheric modeling that searches for locally optimized Az coefficients. This approach involves fitting TEC output from NeQuick G to TEC data collected from GNSS stations around Korea under various ionospheric conditions including different seasons and both low and high solar activity phases. The optimized Az coefficients enable calculation of the Az index at any position within a region of interest, accounting for the spatial variability of the Az index in a polynomial function of MODIP. The results reveal reduced TEC estimation errors, particularly during high solar activity, with a maximum reduction in the RMS error by 85.95%. This indicates that the proposed method for NeQuick G can effectively model various ionospheric conditions in local areas, offering potential applications in GNSS performance analyses for local areas by generating various ionospheric scenarios.

• The Journal of Pediatrics of Korean Medicine
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• v.17 no.2
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• pp.149-160
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• 2003

Objective : Essential oil inhalation and He-Ne laser treatment has become increasingly available in children with nasal diseases. But the reports on the effect and prognosis have been poor. In this study, we analyzed the treatment effect, recurrence rate and the degree of recurrent symptoms. Materials/Methods: 23 children(2-10 year-old) with nasal diseases, who received essential oil inhalation with He-Ne laser treatment at least 10 times in our hospital from January 1st 2001 to December 31th 2002 were studied. Result : Ten cases are male & thirteen cases are female. The average of age was 4.91 year-old. The most frequency symptoms are nasal discharge (82.6%), nasal obstruction (78.3%), cough (47.8%), secretion sound (39.1%), sneezing (17.4%). Average numbers of treatment period, interval and treatment times are 71.79 days, 4.06 days, 18.13 times respectively. Of the 23 children, 14 children were in 'all symptom improved' at the remedial ends, and 22 children relapsed. In the degree of recurrent symptoms, 15 children were in 'more improved then before-treatment and not equal to directly remedial ends'. No case was in 'worse than before-treatment'. The final result of treatment, 6 children keep the degree of remedial ends, on the other hand 17 children are not. Conclusions : Even though, the recurrence rate was high, this combined treatment improve nasal symptoms. The final assessment is good, when the treatment-result is good, when the treatment interval is regular and when parent's are cooperative. If the symptoms continue a whole year, the result is not so good.