383 research outputs found
The Effect of E-commerce on The International Trade of Small and Medium Enterprises in China
In modern world, economic globalization is the trend of the economic development. In order to adapt to the trend of economic globalization and survive, enterprises have to do the international trade to improve their competitive ability, especially for the small and medium enterprises(SMEs). SMEs do not have good way to get economic information and cannot sell their products in big markets like the big enterprises. The development of the e-commerce provides great opportunity for the SMEs to do the international trade. As we all know that China is called the factory of the world now. China\u27s products are sold in the whole word and the small and medium enterprises\u27 goods account for a large proportion. 21st century is the information age. The small and medium enterprises should use the e-commerce to do the international trade and expand their markets. The small and medium enterprises in China have their special characteristics and China has special policy. This research talks about the characteristics of the international trade of small and medium enterprises in China. Then it discusses how e-commerce is developed in China. By considering these information it discusses how e-commerce effects the international trade of small and medium enterprises in China
The calendar effect of Dutch Auction on Gongtianxiaâs agricultural products
In recent years, agricultural e-commerce sales model is in full swing. As the nationâs largest B2C e-commerce company of agricultural products, ShanXi GongTianXia E-commerce Co., Ltd. (hereinafter referred to as GongTianXia ) launched the 7-day auction and 15-minute auction since the end of 2014 on their official Wechat platform. Through these two new sales patterns, GongTianXia wants to attract more customersâ attention to agricultural products, and thus lead to greater trade volume and profits.Many studies have shown that calendar effect has a wide range of use in financial markets. Likewise, as temporal-series data, did GongTianXiaâs two kinds of price reduction auctions have similarities with the laws of financial markets? Thereâs no research to prove it so far. Taking GongTianXiaâs over 200,000 transactions data occurred during 432 instances of â7-day auctionâ and 943 instances of â15-minute auctionâ within 2015, this paper discusses the impacts of different periods of âsignificant time pointsâ under both â7-day auctionâ and â15-minute auctionâ on different types of commodities, then explain why those results may happen. With the fin dings, we can improve calender effect theory and make a theoretical complement for Dutch auction as Mobile commerce, and give more optimization advices on mobile commerce companies
PEPNet: Parameter and Embedding Personalized Network for Infusing with Personalized Prior Information
With the increase of content pages and interactive buttons in online services
such as online-shopping and video-watching websites, industrial-scale
recommender systems face challenges in multi-domain and multi-task
recommendations. The core of multi-task and multi-domain recommendation is to
accurately capture user interests in multiple scenarios given multiple user
behaviors. In this paper, we propose a plug-and-play \textit{\textbf{P}arameter
and \textbf{E}mbedding \textbf{P}ersonalized \textbf{Net}work
(\textbf{PEPNet})} for multi-domain and multi-task recommendation. PEPNet takes
personalized prior information as input and dynamically scales the bottom-level
Embedding and top-level DNN hidden units through gate mechanisms.
\textit{Embedding Personalized Network (EPNet)} performs personalized selection
on Embedding to fuse features with different importance for different users in
multiple domains. \textit{Parameter Personalized Network (PPNet)} executes
personalized modification on DNN parameters to balance targets with different
sparsity for different users in multiple tasks. We have made a series of
special engineering optimizations combining the Kuaishou training framework and
the online deployment environment. By infusing personalized selection of
Embedding and personalized modification of DNN parameters, PEPNet tailored to
the interests of each individual obtains significant performance gains, with
online improvements exceeding 1\% in multiple task metrics across multiple
domains. We have deployed PEPNet in Kuaishou apps, serving over 300 million
users every day.Comment: Accepted by KDD 202
Understanding and Modeling Passive-Negative Feedback for Short-video Sequential Recommendation
Sequential recommendation is one of the most important tasks in recommender
systems, which aims to recommend the next interacted item with historical
behaviors as input. Traditional sequential recommendation always mainly
considers the collected positive feedback such as click, purchase, etc.
However, in short-video platforms such as TikTok, video viewing behavior may
not always represent positive feedback. Specifically, the videos are played
automatically, and users passively receive the recommended videos. In this new
scenario, users passively express negative feedback by skipping over videos
they do not like, which provides valuable information about their preferences.
Different from the negative feedback studied in traditional recommender
systems, this passive-negative feedback can reflect users' interests and serve
as an important supervision signal in extracting users' preferences. Therefore,
it is essential to carefully design and utilize it in this novel recommendation
scenario. In this work, we first conduct analyses based on a large-scale
real-world short-video behavior dataset and illustrate the significance of
leveraging passive feedback. We then propose a novel method that deploys the
sub-interest encoder, which incorporates positive feedback and passive-negative
feedback as supervision signals to learn the user's current active
sub-interest. Moreover, we introduce an adaptive fusion layer to integrate
various sub-interests effectively. To enhance the robustness of our model, we
then introduce a multi-task learning module to simultaneously optimize two
kinds of feedback -- passive-negative feedback and traditional randomly-sampled
negative feedback. The experiments on two large-scale datasets verify that the
proposed method can significantly outperform state-of-the-art approaches. The
code is released at https://github.com/tsinghua-fib-lab/RecSys2023-SINE.Comment: Accepted by RecSys'2
Distribution and expression of SLC45A2 in the skin of sheep with different coat colors
Introduction. To investigate whether the membrane-associated transporter protein SLC45A2 is differentially expressed in the skin of sheep with different coat colors and to determine its correlation with coat color establishment in sheep.
Material and methods. The expression of SLC45A2 in sheep skin samples with different coat colors was qualitatively and quantitatively analyzed by PCR amplification, RT-PCR, immunohistochemical staining and Western blotting.
Results. A 193-bp SLC45A2 CDS sequence was successfully amplified from sheep skin samples with diverse coat colors. RT-PCR analysis revealed that SLC45A2 mRNA was expressed in all sheep skin samples tested, with relative expression levels of 512.74 ± 121.51 in black skin, 143.38 ± 119.31 and 1.36 ± 0.09 in black dots and white dots of piebald skin, respectively, and 1.02 ± 0.23 in white skin (p < 0.01**). Positive SLC45A2 protein bands were also detected in all skin samples by Western blot analysis, with relative expression levels of 0.85 ± ± 0.17** in black skin, 0.60 ± 0.05** and 0.34 ± 0.07 in black dots and white dots of piebald skin, respectively, and 0.20 ± 0.05 in white skin (p < 0.01**). Immunohistochemical assays revealed that SLC45A2 was expressed in the hair follicle matrix, the inner and outer root sheath, and the dermal papilla in the skin tissues with different coat colors. These patterns were quantified by optical density (OD) analysis, which yielded relative expression levels of 0.23 ± 0.11 in black skin, 0.19 ± 0.09 and 0.10 ± 0.03 in black dots and white dots of piebald skin, respectively, and 0.08 ± 0.01 in white skin (p < 0.05*).
Conclusion. SLC45A2 is detectably expressed in sheep skin of all coat colors, though at significantly different levels. SLC45A2 may participate in the establishment of coat color by regulating the synthesis and trafficking of melanin.
TWIN: TWo-stage Interest Network for Lifelong User Behavior Modeling in CTR Prediction at Kuaishou
Life-long user behavior modeling, i.e., extracting a user's hidden interests
from rich historical behaviors in months or even years, plays a central role in
modern CTR prediction systems. Conventional algorithms mostly follow two
cascading stages: a simple General Search Unit (GSU) for fast and coarse search
over tens of thousands of long-term behaviors and an Exact Search Unit (ESU)
for effective Target Attention (TA) over the small number of finalists from
GSU. Although efficient, existing algorithms mostly suffer from a crucial
limitation: the \textit{inconsistent} target-behavior relevance metrics between
GSU and ESU. As a result, their GSU usually misses highly relevant behaviors
but retrieves ones considered irrelevant by ESU. In such case, the TA in ESU,
no matter how attention is allocated, mostly deviates from the real user
interests and thus degrades the overall CTR prediction accuracy. To address
such inconsistency, we propose \textbf{TWo-stage Interest Network (TWIN)},
where our Consistency-Preserved GSU (CP-GSU) adopts the identical
target-behavior relevance metric as the TA in ESU, making the two stages twins.
Specifically, to break TA's computational bottleneck and extend it from ESU to
GSU, or namely from behavior length to length , we build a
novel attention mechanism by behavior feature splitting. For the video inherent
features of a behavior, we calculate their linear projection by efficient
pre-computing \& caching strategies. And for the user-item cross features, we
compress each into a one-dimentional bias term in the attention score
calculation to save the computational cost. The consistency between two stages,
together with the effective TA-based relevance metric in CP-GSU, contributes to
significant performance gain in CTR prediction.Comment: Accepted by KDD 202
Mixed Attention Network for Cross-domain Sequential Recommendation
In modern recommender systems, sequential recommendation leverages
chronological user behaviors to make effective next-item suggestions, which
suffers from data sparsity issues, especially for new users. One promising line
of work is the cross-domain recommendation, which trains models with data
across multiple domains to improve the performance in data-scarce domains.
Recent proposed cross-domain sequential recommendation models such as PiNet and
DASL have a common drawback relying heavily on overlapped users in different
domains, which limits their usage in practical recommender systems. In this
paper, we propose a Mixed Attention Network (MAN) with local and global
attention modules to extract the domain-specific and cross-domain information.
Firstly, we propose a local/global encoding layer to capture the
domain-specific/cross-domain sequential pattern. Then we propose a mixed
attention layer with item similarity attention, sequence-fusion attention, and
group-prototype attention to capture the local/global item similarity, fuse the
local/global item sequence, and extract the user groups across different
domains, respectively. Finally, we propose a local/global prediction layer to
further evolve and combine the domain-specific and cross-domain interests.
Experimental results on two real-world datasets (each with two domains)
demonstrate the superiority of our proposed model. Further study also
illustrates that our proposed method and components are model-agnostic and
effective, respectively. The code and data are available at
https://github.com/Guanyu-Lin/MAN.Comment: WSDM 202
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