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Supervised text data augmentation method for deep neural networks
Jaehwan Seol,Jieun Jung,Yeonseok Choi,Yong-Seok Choi The Korean Statistical Society 2023 Communications for statistical applications and me Vol.30 No.3
Recently, there have been many improvements in general language models using architectures such as GPT-3 proposed by Brown et al. (2020). Nevertheless, training complex models can hardly be done if the number of data is very small. Data augmentation that addressed this problem was more than normal success in image data. Image augmentation technology significantly improves model performance without any additional data or architectural changes (Perez and Wang, 2017). However, applying this technique to textual data has many challenges because the noise to be added is veiled. Thus, we have developed a novel method for performing data augmentation on text data. We divide the data into signals with positive or negative meaning and noise without them, and then perform data augmentation using k-doc augmentation to randomly combine signals and noises from all data to generate new data.
Choi, Sujin,Song, Hyekyung,Jeong, Jaehwan,Jeon, Inho,Yoon, Hosung,Chung, Kiwha,Won, Yongjin,Choi, Jeyong,Kim, Unkyung Korean Society for Molecular Biology 2008 Molecules and cells Vol.25 No.2
Microsatellites, short tandem repeats, are useful markers for genetic analysis because of their high frequency of occurrence over the genome, high information content due to variable repeat lengths, and ease of typing. To establish a panel of microsatellite markers useful for genetic studies of the Korean population, the allele frequencies and heterozygosities of 207 microsatellite markers in 119 unrelated Korean, Indian and Pakistani individuals were compared. The average heterozygosity of the Korean population was 0.71, similar to that of the Indian and Pakistani populations. More than 80% of the markers showed heterozygosity of over 0.6 and were valuable as genetic markers for genome-wide screening for disease susceptibility loci in these populations. To identify the allelic distributions of the multilocus genetic data from these microsatellite markers, the population structures were assessed by clustering. These markers supported, with the most probability, three clustering groups corresponding to the three geographical populations. When we assumed only two hypothetical clusters (K), the Korean population was separate from the others, suggesting a relatively deep divergence of the Korean population. The present 207 microsatellite markers appear to reflect the historical and geographical origins of the different populations as well as displaying a similar degree of variation to that seen in previously published genetic data. Thus, these markers will be useful as a reference for human genetic studies on Asians.
Matching Pursuit 방식을 이용한 OFDM 시스템의 채널 추정
최재환(Jaehwan Choi),임채현(Chaehyun Lim),한동석(Dongseog Han),윤대중(Daejung Yoon) 한국방송·미디어공학회 2004 한국방송공학회 학술발표대회 논문집 Vol.2004 No.-
본 논문에서는 직교 주파수 분할 다중 접속 (orthogonal frequency division multiplexing, OFDM) 시스템에서 matching pursuit (MP) 알고리듬을 이용하는 이동 채널 추정법을 제안한다. 기존의 OFDM 시스템에서 채널추정 알고리듬으로 쓰이는 zero-forcing (ZF) 알고리듬은 잡음의 영향으로 채널 추정 오류의 가능성을 가지고 있다. 제안한 알고리듬에서는 MP 알고리듬을 이용하여 스파스(sparse)형태의 채널을 추정함으로써 다중경로가 없다고 가정되는 시간영역의 채널구간에서 발생될 수 있는 잡음에 의한 영향을 줄인다. 또한 연속적으로 전송되는 파일럿 정보를 이용하여 실시간으로 채널의 변화를 추정한다. 제안한 알고리듬으로 채널을 추정하고 등화를 했을 경우 ZF 알고리듬보다 우수한 성능을 보임을 실험에서 확인한다.
HFCVD 증착 온도 변화에 따른 단결정 다이아몬드 표면 형상 및 성장률 변화
권진욱,김민수,장태환,배문기,김성우,김태규,Gwon, J.U.,Kim, M.S.,Jang, T.H.,Bae, M.K.,Kim, S.W.,Kim, T.G. 한국열처리공학회 2021 熱處理工學會誌 Vol.34 No.5
Following Silicon Carbide, single crystal diamond continues to attract attention as a next-generation semiconductor substrate material. In addition to excellent physical properties, large area and productivity are very important for semiconductor substrate materials. Research on the increase in area and productivity of single crystal diamonds has been carried out using various devices such as HPHT (High Pressure High Temperature) and MPECVD (Microwave Plasma Enhanced Chemical Vapor Deposition). We hit the limits of growth rate and internal defects. However, HFCVD (Hot Filament Chemical Vapor Deposition) can be replaced due to the previous problem. In this study, HFCVD confirmed the distance between the substrate and the filament, the accompanying growth rate, the surface shape, and the Raman shift of the substrate after vapor deposition according to the vapor deposition temperature change. As a result, it was confirmed that the difference in the growth rate of the single crystal substrate due to the change in the vapor deposition temperature was gained up to 5 times, and that as the vapor deposition temperature increased, a large amount of polycrystalline diamond tended to be generated on the surface.
단열재와 상변화물질을 이용한 비행체 전자장비의 열방호 설계에 대한 개념적 연구
최홍석(Hong Seok Choi),이호준(Hong Seok Choi),임창범(Chang-Bum Lim),이재환(Jaehwan Lee),유정규(Jung-Kyu Ryou) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Electronics onboard flight vehicles are exposed to high temperature because of aerodynamic heating and heat generation inside the electronics. Thermal protection methods and design approach of flight vehicle electronics using insulators and phase change material are presented in this paper.
Yeong Joon Kim(Yeong Joon Kim),Chang Hoi Kim(Chang Hoi Kim),Jooyeon Kim(Jooyeon Kim),Gilsoon Choi(Gilsoon Choi),Yeong Wook Jeong(Yeong Wook Jeong),Jaehwan Kwon(Jaehwan Kwon) 대한미용의학회 2022 대한미용의학회지 Vol.6 No.2
Background: Data on structural modifications caused by septal deviation may help otolaryngologists make informed decisions on the inclusion of turbinate surgery with septoplasty as well as identify the part of the inferior turbinate that requires more attention during surgery. Objective: This study aimed to compare the dimensions of the ipsilateral and contralateral sides of the inferior turbinate and the septal deviation in a Korean population. Methods: We retrospectively analyzed the facial computed tomography (CT) scans of 111 patients who underwent septoplasty between January 2012 and December 2017 for the anterior, posterior, and maximally deviated sites of the inferior turbinate. Results: Statistical analyses revealed differences in the medial mucosa and the total thickness of the anterior and maximally deviated sites between the ipsilateral and contralateral sides. The medial mucosal portion of the anterior site was 4.64±2.12 mm on the contralateral side and 4.14±1.75 mm on the ipsilateral side (p=0.03). The total thickness of the anterior site was 9.72±4.25 mm on the contralateral side and 8.58±3.36 mm on the ipsilateral side (p=0.02). The medial mucosal portion of the maximally deviated site was 5.09±2.52 mm on the contralateral side and 4.39±2.05 mm on the ipsilateral side (p=0.04). The total thickness of the maximally deviated site was 9.58±4.06 mm on the contralateral side and 8.81±3.50 mm on the ipsilateral side (p=0.04). No significant differences were found in the measurements between the two sides of the posterior site or in the bone thickness at any of the sites. The inferior turbinate did not show any significant relationship with the deviation angle. Conclusion: A conservative submucosal turbinoplasty without bone removal may be favorable. Level of Evidence: Level IV
Perspective and potential of smart optical materials
Choi, Sang H,Duzik, Adam J,Kim, Hyun-Jung,Park, Yeonjoon,Kim, Jaehwan,Ko, Hyun-U,Kim, Hyun-Chan,Yun, Sungryul,Kyung, Ki-Uk Institute of Physics Publishing 2017 Smart materials & structures Vol.26 No.9
<P>The increasing requirements of hyperspectral imaging optics, electro/photo-chromic materials, negative refractive index metamaterial optics, and miniaturized optical components from micro-scale to quantum-scale optics have all contributed to new features and advancements in optics technology. Development of multifunctional capable optics has pushed the boundaries of optics into new fields that require new disciplines and materials to maximize the potential benefits. The purpose of this study is to understand and show the fundamental materials and fabrication technology for field-controlled spectrally active optics (referred to as smart optics) that are essential for future industrial, scientific, military, and space applications, such as membrane optics, filters, windows for sensors and probes, telescopes, spectroscopes, cameras, light valves, light switches, and flat-panel displays. The proposed smart optics are based on the Stark and Zeeman effects in materials tailored with quantum dot arrays and thin films made from readily polarizable materials via ferroelectricity or ferromagnetism. Bound excitonic states of organic crystals are also capable of optical adaptability, tunability, and reconfigurability. To show the benefits of smart optics, this paper reviews spectral characteristics of smart optical materials and device technology. Experiments testing the quantum-confined Stark effect, arising from rare earth element doping effects in semiconductors, and applied electric field effects on spectral and refractive index are discussed. Other bulk and dopant materials were also discovered to have the same aspect of shifts in spectrum and refractive index. Other efforts focus on materials for creating field-controlled spectrally smart active optics on a selected spectral range. Surface plasmon polariton transmission of light through apertures is also discussed, along with potential applications. New breakthroughs in micro scale multiple zone plate optics as a micro convex lens are reviewed, along with the newly discovered pseudo-focal point not predicted with conventional optics modeling. Micron-sized solid state beam scanner chips for laser waveguides are reviewed as well.</P>