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( Ramadhan Zeno Rizqi ),김용현 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Stretchable electronic devices have received much attention due to its novel applications including stretchable, werable displays, sensors, solar cells, light emitting skins, biometric devices, and human-interface devices. The development of transparent electrode is of importance to achieve high performance stretchable optoelectronics. Here, we investigate high performance stretchable transparent electrodes based on silver nanowires as alternative electrodes to replace ITO with chitosan stretchable substrates. While PDMS is most widely used materials as a stretchable transparent substrate, chitosan has received much attention as a promising stretchable transparent substrate which is bio-degradable, bio-compatible. The stretchable transparent electrodes on chitosan developed here show the high transmittance (88.9%), the low sheet resistance (12.2 ohm/sq), and excellent stretchability. The stretchable transparent electrodes are successfully adopted into EL devices with ZnS: Cu phosphors.
High-Performance Stretchable Transparent Electrodes on Biopolymer Substrates
( Ramadhan Zeno Rizqi ),김용현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Stretchable electronic devices have received much attention due to its novel applications including stretchable, werable displays, sensors, solar cells, light emitting skins, biometric devices, and human-interface devices. The development of transparent electrode is of importance to achieve high performance stretchable optoelectronics. Here, we investigate high performance stretchable transparent electrodes based on silver nanowires as alternative electrodes to replace ITO with chitosan stretchable substrates. While PDMS is most widely used materials as a stretchable transparent substrate, chitosan has received much attention as a promising stretchable transparent substrate which is bio-degradable, bio-compatible. The stretchable transparent electrodes on chitosan developed here show the high transmittance (88.9%), the low sheet resistance (12.2 ohm/sq), and excellent stretchability. The stretchable transparent electrodes are successfully adopted into EL devices with ZnS: Cu phosphors.
Ramadhan Hardani Putra,Eha Renwi Astuti,Aga Satria Nurrachman,Dina Karimah Putri,Ahmad Badruddin Ghazali,Tjio Andrinanti Pradini,Dhinda Tiara Prabaningtyas Korean Academy of Oral and Maxillofacial Radiology 2023 Imaging Science in Dentistry Vol.53 No.-
Purpose: The objective of this scoping review was to investigate the applicability and performance of various convolutional neural network (CNN) models in tooth numbering on panoramic radiographs, achieved through classification, detection, and segmentation tasks. Materials and Methods: An online search was performed of the PubMed, Science Direct, and Scopus databases. Based on the selection process, 12 studies were included in this review. Results: Eleven studies utilized a CNN model for detection tasks, 5 for classification tasks, and 3 for segmentation tasks in the context of tooth numbering on panoramic radiographs. Most of these studies revealed high performance of various CNN models in automating tooth numbering. However, several studies also highlighted limitations of CNNs, such as the presence of false positives and false negatives in identifying decayed teeth, teeth with crown prosthetics, teeth adjacent to edentulous areas, dental implants, root remnants, wisdom teeth, and root canal-treated teeth. These limitations can be overcome by ensuring both the quality and quantity of datasets, as well as optimizing the CNN architecture. Conclusion: CNNs have demonstrated high performance in automated tooth numbering on panoramic radiographs. Future development of CNN-based models for this purpose should also consider different stages of dentition, such as the primary and mixed dentition stages, as well as the presence of various tooth conditions. Ultimately, an optimized CNN architecture can serve as the foundation for an automated tooth numbering system and for further artificial intelligence research on panoramic radiographs for a variety of purposes.
학습된 인덱스 사례 연구 : 분할 선형 회기 기반 검색
Ramadhan Agung Rahmat,Jongmoo Choi 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.05
Binary search is an efficient algorithm for finding an item from a sorted data. Although binary search is very powerful, sometimes the process of binary search is very inefficient to find items that are next to the starting or ending items. To overcome this problem, a novel approach called learned index has been proposed recently. The key idea of the learned index is replacing an index construction with a model training and a lookup via index as an inference via model. In this paper, as a case study of the learned index, we design a new search algorithm, called Segmented Linear Regression (SLR) based search. It employs SLR to estimate the approximate location of a given key and to decrease the error distance during searching. We have conducted experiments with two real-world datasets, OpenStreetMap and Twitter User data. Evaluation results show that our proposal is about 1.38x faster than the binary search.
Ahmed Ramadhan Al-Obaidi 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4
Numerical simulation was performed to analyze the behavior of a flow field, characteristic of pressure drop, and hydraulic thermal performance. Moreover, influences of different twisted tape geometric parameters, including three twisted tape inserts (NTTI) 1, 3 and 5. Also, six different twisted turns (NTT) were comparably quantitative and qualitative studied using various important parameters, including static pressure, dynamic pressure, and velocity magnitude, respectively. The results revealed that the value of pressure drop between each cross section in the pipe decreases as pipe length increases. When the NTTIs increases that leads to a pressure difference also increasing as compared to the smooth pipe. It is found that inserting twisted tape in the pipe leads causes considerably high resistance in the flow, then leads to increase the pressure difference. In addition, the results show that existence of the twisted tapes inside the pipe can create more vortex motion (swirl flows) that leads to formation of different radial velocities. Also, the PEF factor decreases as the Re increases. The comparison results for the numerical and experimental indicate that a good agreement of the average deviation for f (friction factor) and Nu is around 6.5% and 7%. The minimum Nu number value was 10 for NTT1 at Re number of 900 and the higher value was 50 at Re of 14,000. The PEF is more than 1.6 for NTT6 configuration. The results indicate that the temperature difference increases up to 38.1%, 46.11% and 50.52% with increasing the NTTI from 1 to 5, respectively, as compared to the temperature difference in a smooth pipe.