• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.605-607
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• 2019

최적의 사진을 얻기 위해 시각적 방해요소들을 개선할 수 있는 기술들을 조사했다. CNN 모델을 활용한 HDR 이미지 재구성, 방해물과 원하는 피사체와의 깊이 차이에서 생기는 시차를 이용한 이미지 처리를 사용해서 시각적 방해요소를 개선하는 알고리즘을 기술했다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.1
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• pp.184-190
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• 2006

Using COMS which provides multi-beam switching function, the optimal transmission channel environments which provides the high data rate communication are proposed in this paper. Also the link budget for communication transponder of COMSAT is designed. Bsaed on the channel modeling for group delay, non-linear and gain flatness characteristics, the system performances which provide high data rate (HDR) service were analyzed in Ka-band satellite channel. As the transmission data rate is increased, the degradation due to these channel characteristics is severely affect the system performance. To efficiently provide the various service via the same transmission system it is necessary to equlize the primary impairment factors. The optimum operating points of HDR satellite transmission system are implemeted and operated by considering the analyzed results on channel characteristics.

• The Korea Journal of Herbology
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• v.31 no.2
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• pp.47-62
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• 2016

Objectives : This study was aimed to analyze the correlation between the Herbology and contemporary research results, KCD and terms of Alismatis Rhizoma. The study will present information that can be used to find the direction of further researches and be applied to the education of Herbology.Methods : Papers were searched in Riss4U and PubMed, and categorized. Medicine or pharmacy articles about Alismatis Rhizoma were matched with the Herbology treatment and KCD. KCD-codes and terms were arranged by the Herbology treatment. The Degree of Herbology research (HDR) was calculated by numbers of papers, study method, citation rates.Results : There were 392 articles about Alismatis Rhizoma. Among these there were 141 medicine and pharmacy articles about Alismatis Rhizoma, and 51 articles were matched to the Herbology treatment. Studies about Phlegm-Fluid Retention and Dizziness, Edema and Distention and Fullness was more active than others. Analysis of other articles showed that studies about anti-cancer, anti-biotic effect, anti-diabetes mellitus, anti-oxidant effect, anti-inflammation, hepatoprotective effect were active, too. In HDR, Phlegm-Fluid Retention and Dizziness was scored by 181, Edema- Distention and Fullness by 173, Hyperlipidemia by 83, Dysuria 64, Heat strangury pain by 18, Diarrhea and decreased urine volum by 0.Conclusions : 141 articles about Alismatis Rhizoma were analyzed and 51 articles were matched to the Herbology treatment. Studies about Phlegm-Fluid Retention and Dizziness, Edema and Distention and Fullness were more active than others. And studies about anti-cancer, anti-biotic effect, anti-oxidant effect, anti-inflammation, Osteoporosis should be more studied and be more discussed among Herbology researchers.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.12C
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• pp.1020-1028
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• 2010

Relay has attracted great attention due to its inherent capability to extend the service coverage and combat shadowing in next generation mobile communication systems. So far, most relay technologies have been developed under the half-duplex (HD) constraint that prevents relays from transmitting and receiving at the same time. Although half-duplex relay (HDR) is easy to implement, it requires partitioning of resource for transmission and reception, reducing the whole system capacity. In this paper, we propose a multinser precoding and power control scheme with sum rate matching for a full-duplex (FD) multiple-input multiple-output (MIMO) relay. Full-duplex relay (FDR) can overcome the drawback of HDR by transmitting and receiving on the same frequency at the same time, while it is crucial to reduce the effect of self-interference that is caused by its own transmitter to its own receiver. The proposed precoding scheme cancels the self-interference of the FDR as well as to support multiuser MIMO. Moreover, we suggest a power allocation scheme for FD MIMO relay with the constraint that the sum rate of the relay's received data streams is equal to that of the relay's transmit data streams.

• Journal of the Ergonomics Society of Korea
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• v.31 no.2
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• pp.397-406
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• 2012

Objective: The aim of this study is to determine legible Korean font sizes within in-vehicle information systems(IVISs) in diving conditions. Background: Font legibility within IVISs is one of important causes on its' safe operations during driving. Several researches proposed some guidelines on the legible English font sizes within IVISs. On the contrary, appropriate Korean font sizes have been hardly known in spite of the typological differences between English and Korean. Therefore, more systematic researches for improving the legibility on Korean font size within IVISs have been required. Method: In this study, an experiment was performed with the following experimental factors: the existence of vibration, the color contrasts(white on black, black on white), the font types(HDR, CubeR, Gothic), and the font sizes(6, 8, 10, 12, 14, 16, 18, 20, 22, 24pt). To fit the experimental conditions into real driving environments, the illuminance was controlled to 15lx by using LED lamp and the distance between IVIS and participants was kept to 70cm. Moreover, all participants took the shutter glasses for employing well-known occlusion techniques. Results: The experimental results showed that 'HDR' and 'Non-vibration + Black on white' group took the shortest response time, and decreasing slopes of the response time with increasing font sizes were slowing down at 14pt then flattened out at 22pt regardless of the existence of vibration and color contrasts. Conclusion: The minimum size for legible Korean font would be about 14pt(5.47mm) and the optimum size would be about 22pt(8.59mm). Application: The guideline on the Korean font sizes from this study will be applied to design an IVIS in the future.

• The Korea Journal of Herbology
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• v.30 no.5
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• pp.29-43
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• 2015

Objectives : This study was aimed to analyze the correlation between the Herbology and contemporary research results, KCD-codes.Methods : Papers were searched in OASIS and PubMed, then they were categorized. Medicine or pharmacy articles about Menthae Herba were matched with the Herbology treatment and KCD-codes. Other articles were analyzed by abstract of the papers. KCD-codes and terms were arranged by the Herbology treatment. The Degree of Herbology research (HDR) was calculated by numbers of papers, study method, citation rates.Results : There were 97 articles about Menthae Herba. Among these there were 47 medicine and pharmacy articles about Menthae Herba, and 15 articles were matched to the Herbology treatment. Studies about Headache and Wind-warmth was more active than others. Analysis of other articles showed that studies about contraceptive and anti-oxidative effect, plant growth, protective effect from insect, component extraction technics were active, too. In HDR, headache was scored by 136, Wind-warmth by 104, Eye hemorrhage by 51, Discomport in the throat by 50, Distention and fullness in the chest and hypochondrium by 15, Rubella and Measles by 0.Conclusions : 97 articles about Menthae Herba were analyzed and 15 articles were matched to the Herbology treatment. Studies about headache, wind-warmth, eye-hemorrhage were more active than others of the Herbology treatment. And studies about contraceptive and anti-oxidative effect, plant growth, protective effect from insect, component extraction technics could be a new subject of the Herbology.

• The Journal of the Korea institute of electronic communication sciences
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• v.3 no.2
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• pp.86-92
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• 2008

Othogonal Frequency Division Multiplexing(OFDM) has been taken notice of 4th generation communication method because it has a merit of high data rate(HDR). To realize HDR communication, The OFDM a s high efficient Fast-Fourier-Transform (FFT)/Inversion FFT (IFFT) processor. Currently OFDM is realized by Digital Signal Processor(DSP) but it consumes a lot of Power. Therefore, current-mode FFT LSI has been proposed for compensation of this demerit. In this paper, we propose IVC for current-mode FFT LSI. From the simulation result, the output value of IVC is more than 3V when the value of FFT Block output is more than $7.35{\mu}A$. The output value of IVC is lower than 0.5V when the value of FFT Block output is lower than $0.97{\mu}A$. Designed IVC Low-power Current mode FFT LSI will contribute to the operation of current-mode FFT LSI and the development of next generation wireless communication systems.

• Biomedical Science Letters
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• v.12 no.1
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• pp.1-7
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• 2006

Mineral-induced alkaline-reduced water (MRW) is generated by the chemical reaction of water with alkaline earth metals and characterized by high pH and low oxidation-reduction potential. As ROS are believed to have a role in the pathogenesis of obesity, we attempted to determine the effect of MRW on obesity in Sprague-Dawley (SD) rats fed on a high-fat diet. The body weight of the MRW group was significantly lower than that of the control group in most periods of the examination (P<0.05). Serum level of triglycerides (p<0.05) and fat deposition in the livers of the MRW group were found to have been significantly reduced. This suggests that MRW down-regulates lipid metabolism, thereby suppressing obesity. Possible mechanisms of MRW related to reactive oxygen species were also discussed. Our results suggest that MRW is effective in the alleviation of obesity in SD rats fed on high-fat diet.

• Journal of Broadcast Engineering
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• v.25 no.3
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• pp.353-361
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• 2020

VVC (Versatile Video Coding) is a new video compression technique that is being standardized, and it supports HD / UHD / 8K video, and High Dynamic Range (HDR) video with a goal of approximately 2 times higher coding efficiency than the conventional HEVC. It also aims to support a variety of functionalities such as screen content coding, adaptive resolution changes, and independent sub-pictures. In this paper, we investigate the signaling process of intra prediction mode first, and develop an effective coding method of the chroma intra prediction mode. In case of the DM mode, the proposed method simplifies the prediction mode of the chorma intra prediction mode when referring to the angular mode of the luminance block. It can improve coding efficiency of the chroma intra prediction mode, and the proposed process can also consider the size of the block in order to further improve its coding efficiency.

• Progress in Medical Physics
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• v.27 no.4
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• pp.213-219
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• 2016

The position verification of the radiation source utilized in brachytherapy forms a critical factor in determining the therapeutic efficiency. Currently, films are used to verify the source position; however, this method is encumbered by the lengthy time interval required from film scanning to analysis, which makes real-time position verification difficult. In general, the source position accuracy is usually tested in a monthly quality assurance check. In this context, this study investigates the feasibility of the real-time position verification of the radiation source in high dose rate (HDR) brachytherapy with the use of scintillating fibers. To this end, we construct a system consisting of scintillating fibers and a silicon photomultiplier (SiPM), optimize the dosimetric software setup and radiation system characteristics to obtain maximum measurement accuracy, and determine the relative ratio of the measured signals dependent upon the position of the scintillating fiber. According to the dosimetric results based on a treatment plan, in which the dwell time is set at 30 and 60 s at two dwell positions, the number of signals is 31.5 and 83, respectively. In other words, the signal rate roughly doubles in proportion to the dwell time. The source position can also be confirmed at the same time. With further improvements in the spatial resolution and scintillating fiber array, the source position can be verified in real-time in clinical settings with the use of a scintillating fiber-based system.