Naver Corporation

About: Naver Corporation is a company organization based out in Seongnam-si, South Korea. It is known for research contribution in the topics: Terminal (electronics) & Computer science. The organization has 4038 authors who have published 4294 publications receiving 35045 citations. The organization is also known as: NAVER Corporation & NAVER.

Group messaging system and method for providing file sharing through bidirectional interlock with a cloud server

Abstract: Disclosed herein is a group messaging system for providing file sharing through bidirectional interlock with a cloud server, including: a messenger server receiving information requesting creation of a group chatting room including group members and instructing user terminals of the respective group members to create the group chatting room; and a cloud server interlocking with the messenger server, receiving information about the creation of the group chatting room from the messenger server, and creating a sharing group mapped to the group chatting room in a one-to-one scheme.

ViLT: Vision-and-Language Transformer Without Convolution or Region Supervision

Abstract: Vision-and-Language Pre-training (VLP) has improved performance on various joint vision-and-language downstream tasks Current approaches to VLP heavily rely on image feature extraction processes, most of which involve region supervision (eg, object detection) and the convolutional architecture (eg, ResNet) Although disregarded in the literature, we find it problematic in terms of both (1) efficiency/speed, that simply extracting input features requires much more computation than the multimodal interaction steps; and (2) expressive power, as it is upper bounded to the expressive power of the visual embedder and its predefined visual vocabulary In this paper, we present a minimal VLP model, Vision-and-Language Transformer (ViLT), monolithic in the sense that the processing of visual inputs is drastically simplified to just the same convolution-free manner that we process textual inputs We show that ViLT is up to tens of times faster than previous VLP models, yet with competitive or better downstream task performance Our code and pre-trained weights are available at this https URL

Generalized spin-dependent WIMP-nucleus interactions and the DAMA modulation effect

Abstract: Guided by non-relativistic Effective Field Theory (EFT) we classify the most general spin-dependent interactions between a fermionic Weakly Interacting Massive Particle (WIMP) and nuclei, and within this class of models we discuss the viability of an interpretation of the DAMA modulation result in terms of a signal from WIMP elastic scatterings using a halo-independent approach. We find that, although several relativistic EFT's can lead to a spin-dependent cross section, in some cases with an explicit, non-negligible dependence on the WIMP incoming velocity, three main scenarios can be singled out in the non-relativistic limit which approximately encompass them all, and that only differ by their dependence on the transferred momentum. For two of them compatibility between DAMA and other constraints is possible for a WIMP mass below 30 GeV, but only for a WIMP velocity distribution in the halo of our Galaxy which departs from a Maxwellian. This is achieved by combining a suppression of the WIMP effective coupling to neutrons (to evade constraints from xenon and germanium detectors) to an explicit quadratic or quartic dependence of the cross section on the transferred momentum (that leads to a relative enhancement of the expected rate off sodium in DAMA compared to that off fluorine in droplet detectors and bubble chambers). For larger WIMP masses the same scenarios are excluded by scatterings off iodine in COUPP.

Method and System for Providing Joint Viewing Service of Moving Picture

Abstract: Disclose is a method and system enabling joint viewing of moving picture while chatting. In order to match the screen being played and chatting message, a method for synchronizing contents playing times for the contents being played is further disclosed. A room master client among user clients joined the joint viewing room receives buffering state information from all clients in joint viewing and transmits playback start message to the clients in joint viewing according to the buffering state information. After contents playback is started, the room master client provides information on current contents playing time to the other user clients periodically, and the other clients synchronize contents playing times based on the current contents playing time of the room master client.

Improvement of H2S Sensing Properties of SnO2-Based Thick Film Gas Sensors Promoted with MoO3 and NiO

Abstract: The effects of the SnO2 pore size and metal oxide promoters on the sensing properties of SnO2-based thick film gas sensors were investigated to improve the detection of very low H2S concentrations (<1 ppm). SnO2 sensors and SnO2-based thick-film gas sensors promoted with NiO, ZnO, MoO3, CuO or Fe2O3 were prepared, and their sensing properties were examined in a flow system. The SnO2 materials were prepared by calcining SnO2 at 600, 800, 1,000 and 1,200 °C to give materials identified as SnO2(600), SnO2(800), SnO2(1000), and SnO2(1200), respectively. The Sn(12)Mo5Ni3 sensor, which was prepared by physically mixing 5 wt% MoO3 (Mo5), 3 wt% NiO (Ni3) and SnO2(1200) with a large pore size of 312 nm, exhibited a high sensor response of approximately 75% for the detection of 1 ppm H2S at 350 °C with excellent recovery properties. Unlike the SnO2 sensors, its response was maintained during multiple cycles without deactivation. This was attributed to the promoter effect of MoO3. In particular, the Sn(12)Mo5Ni3 sensor developed in this study showed twice the response of the Sn(6)Mo5Ni3 sensor, which was prepared by SnO2(600) with the smaller pore size than SnO2(1200). The excellent sensor response and recovery properties of Sn(12)Mo5Ni3 are believed to be due to the combined promoter effects of MoO3 and NiO and the diffusion effect of H2S as a result of the large pore size of SnO2.