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Taeheon Yun,Junho Yoon,Jun-Hyung Tak 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
To mitigate the intrusion of insect pests, behavioral modifications using repellents are commonly employed. Among their active ingredients, plant essential oils have gained prominence as safer alternatives to synthetic repellents. However, the absence of rigorous scientific efficacy testing have been undermined the reliability of these essential oil based repellent products. Previous studies have highlighted that the observed repellency in bioassays are strongly influenced by the testing environment. Our research introduces three distinct laboratory-scaled repellency test methods – spatial repellency, choice repellency in a closed and opened environment – to evaluate prevalent insect repellent products. Notably, we observed significant variations in repellency percentages among products. The most effective product from each method was identified, and its active ingredients were analyzed both quantitatively and qualitatively, by GC-MS analyses. To determine the applicability of these methods in selecting active ingredient concentrations, individual active ingredient components underwent dose-response testing. Our findings suggest that, when selected appropriately, these three methods can be applied for the development and evaluation of potent essential oil based repellent products.
( Taeheon Lee ),( Jung Ho Park ),( Chongil Sohn ),( Kyung Jae Yoon ),( Yong-taek Lee ),( Jung Hwan Park ),( Il Seok Jung ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.1
Background/Aims We attempted to examine the relationship between abnormal findings on high-resolution manometry (HRM) and videofluoroscopic swallowing study (VFSS) of the pharynx and upper esophageal sphincter (UES), and to identify the risk factors for aspiration. Methods We performed VFSS and HRM on the same day in 36 ischemic stroke patients (mean age, 67.5 years) with dysphagia. Pressure (basal, median intra bolus, and nadir), relaxation time interval of the UES, and mesopharyngeal and hypopharyngeal contractility (as a contractile integral) were examined using HRM. The parameters of VFSS were vallecular residue, pyriform sinus residue, vallecular overflow, penetration, and aspiration. The association between the parameters of VFSS and HRM was analyzed by the Student`s t test. Results Three (8.3%) and 4 (11.1%) stroke patients with dysphagia had pyriform sinus residue and vallecular sinus residue, respectively, and 5 (13.8%) patients showed aspiration. Mesopharyngeal and hypopharyngeal contractile integrals in patients with residue in the pyriform sinus were significantly lower than those in patients without residue in the pyriform sinus (P < 0.05). Relaxation time intervals in patients with aspiration were significantly shorter than those in patients without aspiration (P < 0.05), and multivariate regression analysis revealed a shorter relaxation time interval as the main risk factor for aspiration (OR, 0.03; 95% CI, 0.01-0.65; P < 0.05). Conclusions Manometric measurements of the pharynx and UES were well correlated with abnormal findings in the VFSS, and a shorter relaxation time interval of the UES during deglutition is an important parameter for the development of aspiration. (J Neurogastroenterol Motil 2017;23:34-40)
Unsupervised Anomaly Detection Process Using LLE and HDBSCAN by Style-GAN as a Feature Extractor
Taeheon Lee,Yoonseok Kim,Youngjoo Hyun,Jeonghoon Mo,Youngjun Yoo 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.1
This study proposes a process for detecting anomalies in the manufacturing industry, where data imbalance is a frequent problem. The labeling of anomalies can be challenging owing to the different types of anomalies. To address this issue, we used clustering based on the distribution of acquired normal data. We extracted latent vector values from normal image data as features using the Style-GAN method, after conversion of the time-series data. Subsequently, we performed dimensionality reduction through Locally Linear Embedding (LLE) using the extracted latent vector values and selected the Hierarchical Density-Based Spatial Clustering of Applications with Noise (HDBSCAN) for anomaly detection. We verified the proposed process using a milling dataset that included measurements of vibration, force, and noise. The evaluation of the process included dimensionality reduction methods such as Locally Linear Embedding (LLE), Principal Component Analysis (PCA), Kernel PCA, Singular Value Decomposition (SVD), and ISOmetric mapping (ISO) produced an F-1 score of 0.86.
Kim Taeheon,Kumaresan Yogeenth,Cho Sung Jun,Lee Chang-Lyoul,이헌,Jung Gun Young 나노기술연구협의회 2016 Nano Convergence Vol.3 No.33
As metal nanostructures demonstrated extraordinary plasmon resonance, their optical characteristics have widely been investigated in photo-electronic applications. However, there has been no clear demonstration on the location effect of plasmonic metal layer within the photoanode on both optical characteristics and photovoltaic performances. In this research, the gold (Au) nano-islands (NIs) film was embedded at different positions within the TiO2 nanoparticulate photoanode in dye-sensitized solar cells (DSSC) to check the effect of plasmon resonance location on the device performance; at the top, in the middle, at the bottom of the TiO2 photoanode, and also at all the three positions. The Au NIs were fabricated by annealing a Au thin film at 550 °C. The DSSC having the Au NIs-embedded TiO2 photoanode exhibited an increase in short circuit currents (Jsc) and power conversion efficiency (PCE) owing to the plasmon resonance absorption. Thus, the PCE was increased from 5.92% (reference: only TiO2 photoanode) to 6.52% when the Au NIs film was solely positioned at the bottom, in the middle or at the top of TiO2 film. When the Au NIs films were placed at all the three positions, the Jsc was increased by 16% compared to the reference cell, and consequently the PCE was further increased to 7.01%.
자동변속기가 장착된 궤도차량의 구동계 시스템 파라미터 추정
이태헌(Taeheon Lee),최세범(Seibum Choi) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
본 연구는 군용 궤도차량에 장착된 자동변속기(Automatic Transmission)의 구동계 모델링에 관한 연구이다. 변속기 관련 연구의 최종 목표는 변속 성능 향상이다. 하지만 변속 성능 향상을 위해서는 변속기를 포함한 궤도차량의 구동계 모델링이 가장 먼저 선행되어야 한다. 모델링 시뮬레이션 결과가 실험 데이터와 비슷할수록 모델링이 잘 된 것이며, 이후 변속 제어를 하는데 있어 정교한 제어를 할 수 있게 된다. 본 논문에서는 먼저 자동변속기가 장착된 구동계 모델링에 대해 언급하고, 이 후 실험 데이터를 바탕으로 주요 시스템 파라미터를 추정하는 방법을 제시하였다. 추정하는 시스템 파라미터로는 inertia, output shaft의 stiffness, 클러치의 마찰계수가 있다. 제안된 방법을 통해 얻어진 시스템 파라미터들이 실제 실험 데이터와 일치하는지를 보기 위해, simdriveline을 이용해 만든 자동변속기 모델에서의 시뮬레이션을 통해 성능을 검증하였다.
Lee, Taeheon,Kim, Byunghee,Kim, Sumin,Han, Jong Hun,Jeon, Heung Bae,Lee, Young Sil,Paik, Hyun-Jong RSC Pub 2015 Nanoscale Vol.7 No.15
<P>We synthesized poly((furfuryl methacrylate)-co-(2-(dimethylamino)ethyl methacrylate)) (p(FMA-co-DMAEMA)) for the dispersion of single-walled carbon nanotubes (SWCNTs) while maintaining their high aspect ratios. The nanotubes' length and height were 2.0 μm and 2 nm, as determined by transmission electron microscopy and atomic force microscopy, respectively. Transparent conductive films (TCFs) were fabricated by individually dispersed long SWCNTs onto a flexible polyethylene terephthalate substrate. The sheet resistance (Rs) was 210 ω (-1) with 81% transmittance at a wavelength of 550 nm. To reduce their Rs, the TCFs were treated with HNO3 and SOCl2. After treatment, the TCFs had an Rs of 85.75 ω (-1) at a transmittance of 85%. The TCFs exhibited no appreciable change over 200 repeated bending cycles. Dispersing SWCNTs with this newly synthesized polymer is an effective way to fabricate a transparent, highly conductive and flexible film.</P>