Video Captioning via Hierarchical Reinforcement Learning

Video captioning is the task of automatically generating a textual description of the actions in a video. Although previous work (e.g. sequence-to-sequence model) has shown promising results in abstracting a coarse description of a short video, it is still very challenging to caption a video containing multiple fine-grained actions with a detailed description. This paper aims to address the challenge by proposing a novel hierarchical reinforcement learning framework for video captioning, where a high-level Manager module learns to design sub-goals and a low-level Worker module recognizes the primitive actions to fulfill the sub-goal. With this compositional framework to reinforce video captioning at different levels, our approach significantly outperforms all the baseline methods on a newly introduced large-scale dataset for fine-grained video captioning. Furthermore, our non-ensemble model has already achieved the state-of-the-art results on the widely-used MSR-VTT dataset.Comment: CVPR 2018, with supplementary materia

Experimental Investigation on the Feasibility and Optimal Frequency of Ultrasonic Assisted Ice Drilling Method

Exploitation of polar resources and scientific research require efficient ice drilling technology. Thermal drilling is a common method for polar ice drilling, and is similar to the principle of ultrasonic assisted drilling; both are drilled by melting ice layers, but improving energy utilization has always been a challenge. In order to improve energy utilization and drilling efficiency, this paper proposes a method for ice drilling with ultrasonic frequency vibration. The mechanism of ultrasonic vibration drilling into ice was analyzed, the solid theoretical foundation for the application of ice melting efficiency under ultrasonic frequency vibration was determined and a series of indoor experiments were conducted. According to experimental data obtained, two conclusions were provided. First, different frequencies have distinct influence on power density, drilling speed and melting rate, and the optimum range excitation frequency for ultrasonic ice drilling is at least 30~32 kHz, under which the ice melting efficiency and drilling speed reached the peak value. Second, ultrasonic assisted drilling was verified to have the ability of improving the efficiency of ice breaking by comparing to thermal drilling under the same power density under 30 kHz. As an environmentally friendly and efficient drilling method, ultrasonic assisted ice drilling has great application prospects in the field of polar exploration. By using Ultrasonic assisted drilling, we demonstrate a strategy for a faster and more efficient drilling method, which is important for humankind

Integrating Cell Phones into a Chinese High School EFL Classroom: Students’ Attitudes, Technological Readiness, and Perceived Learning

Although explorations on cell phone-based learning (C-learning) in the field of teach­ing English as a foreign language (EFL) has been gaining increasing attention in the last 10 years, the explorations are constrained mainly to distance language teaching. Researchers have pointed out that mobile devices are most effective when combined with group activities, tradi­tional educational activities, and other information and communication technologies (Librero, Ramos, Ranga, Trinona, & Lambert, 2007; Stead, 2005). The purpose of this study was to in­vestigate the integration of a C-learning activity into a traditional EFL classroom by looking at students’ attitudes, technological readiness, perceived learning, and perceived appropriateness of the activity design. A total of 96 high school students from Xiamen, China participated in the study. Students’ survey responses, reflection papers, and final projects were collected and ana­lyzed. Findings of the study indicated that students enjoyed the activity. They found the activity interesting, inspiring, and effective for their English learning. Students had no technological anxieties related to the cell phone use. This study can contribute to the discussion on integrating cell phones for EFL teaching by providing a sample activity as well as students’ possible percep­tions and attitudes toward the activity

Diversified Texture Synthesis with Feed-forward Networks

Recent progresses on deep discriminative and generative modeling have shown promising results on texture synthesis. However, existing feed-forward based methods trade off generality for efficiency, which suffer from many issues, such as shortage of generality (i.e., build one network per texture), lack of diversity (i.e., always produce visually identical output) and suboptimality (i.e., generate less satisfying visual effects). In this work, we focus on solving these issues for improved texture synthesis. We propose a deep generative feed-forward network which enables efficient synthesis of multiple textures within one single network and meaningful interpolation between them. Meanwhile, a suite of important techniques are introduced to achieve better convergence and diversity. With extensive experiments, we demonstrate the effectiveness of the proposed model and techniques for synthesizing a large number of textures and show its applications with the stylization.Comment: accepted by CVPR201

Clinical observation of treatment of fungal corneal ulcer with application of iodine tincture and fluconazole

AIM: To explore the effect of 30g/L iodine rubbed and debridement of wound together with 2g/L fluconazole in the treatment of fungal corneal ulcers. <p>METHODS: Fifty fungal keratitis cases(50 eyes)diagnosed by corneal smear examination were cleaned locally, iodine blanch. All patients were given 2g/L fluconazole for systemic treatment, treated eye with 2g/L fluconazole eye-drops and loxacin eye-drops, and 30g/L atropine eye ointment dilate the pupils.<p>RESULTS:Fifty cases(50 eyes)were selected, of which, 40 cases were healed, 8 cases were improved and 2 cases were aggravated with operation being given.<p>CONCLUSION:After early and timely diagnosis of fungal keratitis, local debridement, 30g/L iodine rubbed the wound and joint with systemic and local treatment of fluconazole can achieve good effect

Suppression of high pTp_{T} hadrons in Pb+PbPb+Pb Collisions at LHC

Nuclear modification factor $R_{AA}(p_{T})$ for large transverse momentum pion spectra in $Pb+Pb$ collisions at $\sqrt{s}=2.76$ TeV is predicted within the NLO perturbative QCD parton model. Effect of jet quenching is incorporated through medium modified fragmentation functions within the higher-twist approach. The jet transport parameter that controls medium modification is proportional to the initial parton density and the coefficient is fixed by the RHIC data on suppression of large $p_{T}$ hadron spectra. Data on charged hadron multiplicity $dN_{ch}/d\eta=1584 \pm 80$ in central $Pb+Pb$ collisions from the ALICE Experiment at the LHC are used to constrain the initial parton density both for determining the jet transport parameter and the 3+1D ideal hydrodynamic evolution of the bulk matter that is employed for the calculation of $R_{PbPb}(p_{T})$ for neutral pions.Comment: 7 pages in RevTex, 3 figures (some typos corrected

Mixing of quasiparticle excitations and gamma-vibrations in transitional nuclei

Evidence of strong coupling of quasiparticle excitations with gamma-vibration is shown to occur in transitional nuclei. High-spin band structures in [166,168,170,172]Er are studied by employing the recently developed multi-quasiparticle triaxial projected shell model approach. It is demonstrated that a low-lying K=3 band observed in these nuclei, the nature of which has remained unresolved, originates from the angular-momentum projection of triaxially deformed two-quasiparticle (qp) configurations. Further, it is predicted that the structure of this band depends critically on the shell filling: in [166]Er the lowest K=3 2-qp band is formed from proton configuration, in [168]Er the K=3 neutron and proton 2-qp bands are almost degenerate, and for [170]Er and [172]Er the neutron K=3 2-qp band becomes favored and can cross the gamma-vibrational band at high rotational frequencies. We consider that these are few examples in even-even nuclei, where the three basic modes of rotational, vibrational, and quasi-particle excitations co-exist close to the yrast line.Comment: 7 pages, 6 figure