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| 1 | Personalized Recommendation Algorithm Based on Preference Features显示文摘A hybrid collaborative filtering algorithm based on the user preferences and item features is proposed. A thorough investigation of Collaborative Filtering(CF) techniques preceded the development of this algorithm. The proposed algorithm improved the user-item similarity approach by extracting the item feature and applying various item features' weight to the item to confirm different item features. User preferences for different item features were obtained by employing user evaluations of the items. It is expected that providing better recommendations according to preferences and features would improve the accuracy and efficiency of recommendations and also make it easier to deal with the data sparsity. In addition, it is expected that the potential semantics of the user evaluation model would be revealed. This would explain the recommendation results and increase accuracy. A portion of the MovieLens database was used to conduct a comparative experiment among the proposed algorithms,i.e., the collaborative filtering algorithm based on the item and the collaborative filtering algorithm based on the item feature. The Mean Absolute Error(MAE) was utilized to conduct performance testing. The experimental results show that employing the proposed personalized recommendation algorithm based on the preference-feature would significantly improve the accuracy of evaluation predictions compared to two previous approaches. | Liang Hu Guohang Song Zhenzhen Xie Kuo Zhao | 2014 | Tsinghua Science and Technology2014，19，3： | 8 |
| 2 | Principles to tailor the saturable and reverse saturable absorption of epsilon-near-zero material显示文摘Indium tin oxide(ITO) films have recently emerged as a new class of functional materials for nonlinear optical(NLO) devices due to their exotic properties around epsilon-near-zero(ENZ) wavelength. Here, we experimentally investigated and tailored the NLO absorption properties of ITO films. The NLO absorption response of ITO films is investigated by using the femtosecond Z-scan measurement technique at two different wavelengths of 1030 nm(out of ENZ region) and 1440 nm(within ENZ region). Interestingly, we observed conversion behavior from saturable absorption(SA) to reverse saturable absorption(RSA) at 1030 nm with the increasing incident laser intensity, whereas only SA behavior was observed at 1440 nm. We demonstrate that SA behavior was ascribed to ground-state free electrons bleaching in the conduction band, and RSA was attributed to three-photon absorption. Moreover, results reveal that ITO film shows more excellent SA performance at 1440 nm with a nonlinear absorption coefficient of ~-23.2 cm∕GW and a figure of merit of ~1.22 × 10^(-16) esu · cm.Furthermore, we tailored the SA and RSA behaviors of ITO films at 1030 and 1440 nm wavelengths via post-annealing treatment. The modulatable NLO absorption was ascribed to the changing of free-carrier concentration in ITO films via annealing treatment. The experimental findings offered an inroad for researchers to tailor its NLO absorption properties by changing the free-carrier concentration through chemical modification such as annealing, oxidation, or defect implantation. The superior and tunable nonlinear optical response suggests that ITO film might be employed as a new class material with potential applications in novel optical switches or optical limiters to realize the all-optical information process. | HAO MA YUANAN ZHAO YUCHEN SHAO YAFEI LIAN WEILI ZHANG GUOHANG HU YUXIN LENG JIANDA SHAO | 2021 | Photonics Research2021，9，5： | 2 |
| 3 | Variation of the band structure in DKDP crystal excited by intense sub-picosecond laser pulses显示文摘The nonlinear absorption(NLA) properties of potassium dideuterium phosphate crystals at 515 nm under different excitation laser intensities are investigated with the Z-scan technique. Two critical intensities are highlighted: the critical intensity for exciting the NLA and the critical intensity of the multiphoton absorption mechanism transition.Experimental results indicate the existence of defect states located in the band gap, which can be manipulated by varying laser intensity. A model based on the change of multiphoton absorption mechanism induced by the transformation of defect species is proposed to interpret the experiments. Modeling results are in good agreement with the experiment data. | Xiaocong Peng Yuanan Zhao Yueliang Wang Zhen Cao Guohang Hu Jianda Shao | 2018 | High Power Laser Science and Engineering2018，6，3： | 2 |
| 4 | Combining wet etching and real time damage event imaging to reveal the most dangerous laser damage initiator in fused silica显示文摘 | Hu Guohang Zhao Yuanan Liu Xiaofeng | 2013 | Optics Letters2013，38，1： | 1 |
| 5 | Performance of rapid-grown KDP crystals with continuous filtration显示文摘Rapid growth processing of KDP crystals was improved by employing continuous filtration to eliminate bulk defects.The performances of the KDP crystals, including scattering defects, laser damage resistance and transmittance, were measured and analyzed. Compared with rapid-grown KDP without continuous filtration, the transmittance in the nearinfrared was increased by at least 2%, almost all of ‘micron size' defects were eliminated and ‘sub-micron size' defects were decreased by approximately 90%. Laser damage testing revealed that the laser-induced damage thresholds(LIDTs),as well as the consistency of the LIDTs from sample to sample, were improved greatly. Moreover, it identified that‘micron size' defects were the precursors which initiated laser damage at relative lower laser fluence(4–6 J cm^(-2)),and there was a lower correlation between smaller size scattering defects and laser damage initiation. The improved consistency in the LIDTs, attributed to elimination of ‘micron size' defects, and LIDT enhancement originated from the decreased absorption of the KDP crystals. | Guohang Hu Yueliang Wang Junxiu Chang Xiaoyi Xie Yuanan Zhao Hongji Qi Jianda Shao | 2015 | High Power Laser Science and Engineering2015，3，1： | 0 |
| 6 | Wireless Laser Power Transmission System for Dynamic Target Using Rotation of Single Component显示文摘We design a novel wireless laser power transmission system in which the process of wireless power transmission to a dynamic target was completed based on the rotation of just one component.The design of this system not only reduces the loadbearing of the gimbal,but also avoids the degradation of beam quality caused by lens vibration when tracking dynamic targets.As a result,this WLPT system has been verified by tracking an unmanned aerial vehicle at 122 m away with an offset distance of±26.7 mm.We believe this system offers great potential in highpower,longdistance dynamic laser power transmission. | Zhang Shuaiyu Hu Guohang Wang Lin Liu Yongjiang Wei Ling Zheng Yifan Shao Yuchuan | 2022 | 激光与光电子学进展2022，59，17： | 0 |
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