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31st AAAI Conference on Artificial Intelligence

作者： Qi, Xiaoyu Yang, Deshun Chen, Xiaoou Peking Univ Inst Comp Sci & Technol 128th ZhongGuanCun North St Beijing 100080 Peoples R China

We propose a triplet-based network for audio feature learning for version identification. Existing methods use hand-crafted features for a music as a whole while we learn features by a triplet-based neural network on segment-level, focusing on the most similar parts between music versions. We conduct extensive experiments and demonstrate our merits.

关键词： Music

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Diversity analysis and quantification of lactic acid bacteria in traditionally fermented yaks' milk products from Tibet

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FOOD BIOtechNOLOGY 2017年第1期31卷 1-19页

作者： Ren, Yan Yang, Yanrong Zhang, Donglei Wang, Dan Zhang, Heping Liu, Wenjun Inner Mongolia Agr Univ Key Lab Dairy Biotechnol & Engn Minist Educ Hohhot 010018 Peoples R China

Fermented yaks' milk is a characteristic fermented dairy product with a rich microflora (especially lactic acid bacteria [LAB]), that has been produced by Tibetan people in china throughout history. Systematic analysis of the LAB composition of fermented yaks' milk from central Tibet is essential. In the present study, 38 samples of fermented yaks' milk were collected from three regions in central Tibet. From these, a total of 211 isolates of LAB were generated using traditional pure culture methods. To accurately analyze their biodiversity, 16S rRNA gene sequence analysis and denaturing gradient gel electrophoresis (DGGE) were used. The isolates were identified as belonging to six genera and 22 species/subspecies. Among them, Lactobacillus species predominated (117 isolates) accounting for 55.45% of all isolates. Overall, L. delbrueckii subsp. bulgaricus (60 isolates;28.43% of the total) was the most commonly isolated species of LAB from fermented yaks' milk from central Tibet. Seven Lactobacillus species and the Bifidobacterium genus were confirmed by quantitative PCR (q-PCR). The q-PCR results showed that the abundance of these groups in fermented yaks' milk from central Tibet ranged from 1.12 +/- 0.36 log cfu/ml (for L. sakei from Ningzhong) to 7.77 +/- 0.84 log cfu/ml (for L. helvetivus from Ningzhong). Lactobacillus acidophilus, L. delbrueckii subsp. bulgaricus, L. fermentum, L. helveticus varied in concentration depending on the region. The results indicated that traditional fermented yaks' milk from different regions of central Tibet have complex compositions of LAB species. The diversity of LAB might be related to geographical origin.

关键词： Lactic acid bacteria Fermented yaks' milk 16S rRNA gene sequencing denaturing gradient gel electrophoresis (DGGE) analysis quantitative PCR

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A method of emission and traveller behavior analysis under multimodal traffic condition

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TRANSPORTATION research PART D-TRANSPORT AND ENVIRONMENT 2017年 52卷 139-155页

作者： Zhang, Weibin Qi, Yong Yan, Ying Tang, Jinjun Wang, Yinhai Univ Washington Dept Civil & Environm Engn Smart Transportat Applicat & Res Lab Seattle WA 98195 USA Nanjing Univ Sci & Technol Sch Comp Sci & Engn Nanjing 210094 Jiangsu Peoples R China Changan Univ Automobile Sch Key Lab Transportat Safety Support Technol Xian 710064 Shaanxi Peoples R China Cent S Univ Sch Traff & Transportat Engn Changsha 410075 Hunan Peoples R China

The growth of urban traffic in recent decades has led to environmental problems in terms of increased emissions. In some cities located along waterfronts, multimodal transportation that includes ferry trips plays an important role in public transportation. Compared with roadway traffic, ferry service can often provide shorter routes between given origins and destinations as well as reduce emissions. However, in some areas with high ferry demand, travel delay occurs frequently because of traffic congestion caused by drivers waiting to board the ferry, which can significantly increase travel time and decrease its reliability. In addition, changes in other factors, such as fuel prices, also may influence drivers' decision making processes in terms of route choice. In this paper, a study focusing on travel time and travel time reliability of ferry service during peak travel periods is performed. Furthermore, as a key result an emission loss model under multimodal conditions is developed that also takes travel cost into account. The analysis of route choice is conducted based on a mixed logit model which is able to handle individual preference. Based upon validation with data from the Seattle area, the proposed model is verified as an efficient way to analyse emission factors in a multimodal transportation environment. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Emission Ferry traffic Route choice Travel time reliability Multimodal transportation

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Abnormal n-p-n type conductivity transition of hollow ZnO/ZnFe₂O₄ nanostructures during gas sensing process: The role of ZnO-ZnFe₂O₄ hetero-interface

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SENSORS AND ACTUATORS B-CHEMICAL 2017年 253卷 144-155页

作者： Li, Wenhui Wu, Xiaofeng Chen, Jiayuan Gong, Yan Han, Ning Chen, Yunfa Chinese Acad Sci Inst Proc Engn State Key Lab Multiphase Complex Syst Beijing 100190 Peoples R China Univ Chinese Acad Sci 19A Yuquan Rd Beijing 100049 Peoples R China

The hollow ZnO/ZnFe2O4 microspheres with heterogeneous structure are synthesized by direct pyrolysis of metal-organic frameworks. The as-prepared ZnO/ZnFe2O4 microspheres have well-defined spherical morphology with 1.5 pin in diameter and multiple porous shells constructed by interpenetrated ZnO and ZnFe2O4 heterogeneous nanoparticles. Interestingly, the hollow ZnO/ZnFe2O4 microspheres based gas sensors show interestingly temperature-dependent n-p-n type conductivity transition in detecting low-concentration VOC gases including ethanol, acetone, toluene and benzene. This interestingly n-p-n transition phenomenon is mainly ascribed to the trade-off of highly separated electron-hole pairs originated from the staggered type-II band alignment of in-shell ZnO-ZnFe2O4 hetero-interfaces, which is modulated by thermally-dependent ionization reaction of surface-absorbed oxygen molecules and extra electron injection due to surface reaction of reductive VOCs during gas-sensing process. This work presents a facile route to construct hollow nanostructures with heterogeneous feature and provides a new insight into sensing mechanism, exhibiting the potential application of ZnO/ZnFe2O4 microspheres in developing highly sensitive and selective gas-sensing materials in detecting low-concentration VOCs. (C) 2017 Elsevier B.V. All rights reserved.

关键词： ZnO/ZnFe2O4 Hollow microspheres Gas sensor p-n conducting transition

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Fast In-Memory Transaction Processing Using RDMA and HTM

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ACM TRANSACTIONS ON COMPUTER SYSTEMS 2017年第1期35卷 1–37页

作者： Chen, Haibo Chen, Rong Wei, Xingda Shi, Jiaxin Chen, Yanzhe Wang, Zhaoguo Zang, Binyu Guan, Haibing Shanghai Jiao Tong Univ Inst Parallel & Distributed Syst 800 Dongchuan Rd Shanghai 200240 Peoples R China

DrTM is a fast in-memory transaction processing system that exploits advanced hardware features such as remote direct memory access (RDMA) and hardware transactional memory (HTM). To achieve high efficiency, it mostly offloads concurrency control such as tracking read/write accesses and conflict detection into HTM in a local machine and leverages the strong consistency between RDMA and HTM to ensure serializability among concurrent transactions across machines. To mitigate the high probability of HTM aborts for large transactions, we design and implement an optimized transaction chopping algorithm to decompose a set of large transactions into smaller pieces such that HTM is only required to protect each piece. We further build an efficient hash table for DrTM by leveraging HTM and RDMA to simplify the design and notably improve the performance. We describe how DrTM supports common database features like read-only transactions and logging for durability. Evaluation using typical OLTP workloads including TPC-C and SmallBank shows that DrTM has better single-node efficiency and scales well on a six-node cluster;it achieves greater than 1.51, 34 and 5.24, 138 million transactions per second for TPC-C and SmallBank on a single node and the cluster, respectively. Such numbers outperform a state-of-the-art single-node system (i.e., Silo) and a distributed transaction system (i.e., Calvin) by at least 1.9X and 29.6X for TPC-C.

关键词： In-memory transactions distributed transactions hardware transactional memory remote direct memory access key-value stores

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Efficient and Available In-Memory KV-Store with Hybrid Erasure Coding and Replication

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ACM TRANSACTIONS ON STORAGE 2017年第3期13卷 1–30页

作者： Chen, Haibo Zhang, Heng Dong, Mingkai Wang, Zhaoguo Xia, Yubin Guan, Haibing Zang, Binyu Shanghai Jiao Tong Univ Inst Parallel & Distributed Syst Shanghai Key Lab Scalable Comp & Syst Room 3402Software Bldg800 Dongchuan Rd Shanghai 200240 Peoples R China

In-memory key/value store (KV-store) is a key building block for many systems like databases and large websites. Two key requirements for such systems are efficiency and availability, which demand a KV-store to continuously handle millions of requests per second. A common approach to availability is using replication, such as primary-backup (PBR), which, however, requires M + 1 times memory to tolerate M failures. This renders scarce memory unable to handle useful user jobs. This article makes the first case of building highly available in-memory KV-store by integrating erasure coding to achieve memory efficiency, while not notably degrading performance. A main challenge is that an in-memory KV-store has much scattered metadata. A single KV put may cause excessive coding operations and parity updates due to excessive small updates to metadata. Our approach, namely Cocytus, addresses this challenge by using a hybrid scheme that leverages PBR for small-sized and scattered data (e.g., metadata and key), while only applying erasure coding to relatively large data (e.g., value). To mitigate well-known issues like lengthy recovery of erasure coding, Cocytus uses an online recovery scheme by leveraging the replicated metadata information to continuously serve KV requests. To further demonstrate the usefulness of Cocytus, we have built a transaction layer by using Cocytus as a fast and reliable storage layer to store database records and transaction logs. We have integrated the design of Cocytus to Memcached and extend it to support inmemory transactions. Evaluation using YCSB with different KV configurations shows that Cocytus incurs low overhead for latency and throughput, can tolerate node failures with fast online recovery, while saving 33% to 46% memory compared to PBR when tolerating two failures. A further evaluation using the SmallBank OLTP benchmark shows that in-memory transactions can run atop Cocytus with high throughput, low latency, and low abort rate and reco

关键词： Primary-backup replication erasure coding KV-store transactions

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Effects of Fe³⁺ and Antioxidants on Glycidyl Ester Formation in Plant Oil at high Temperature and Their Influencing Mechanisms

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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017年第20期65卷 4167-4176页

作者： Cheng, Weiwei Liu, Guoqin Liu, Xinqi South China Univ Technol Sch Food Sci & Engn Guangzhou 510640 Guangdong Peoples R China South China Univ Technol Guangdong Prov Key Lab Green Proc Nat Prod & Prod Guangzhou 510640 Guangdong Peoples R China Henan Univ Technol Coll Food Sci & Engn Zhengzhou 450001 Peoples R China Beijing Technol & Business Univ Beijing Adv Innovat Ctr Food Nutr & Human Hlth Beijing 100048 Peoples R China Beijing Technol & Business Univ Sch Food & Chem Engn Beijing 100048 Peoples R China

This research investigated the effects of Fe3+ and antioxidants on the formation of glycidyl esters (GEs) and, the free radical mediated mechanisms involving the recognition of cyclic acyloxonium free radical intermediate (CAFRI) for GE formation in both the plant oil model (palm oil, camellia oil, soybean oil, and linseed oil) system and the chemical model (dipalmitin and methyl linoleate) system heated at 200 degrees C. Results show that Fe3+ can promote the formation of GEs, which can be inhibited by antioxidants in plant oil during high -temperature exposure. Based on the monitoring of cyclic acyloxonium and ester carbonyl group by Fourier transform infrared spectroscopy,. the promotion of Fe3+ and the inhibition of antioxidants (tertbutylhydroquirione and a-tocopherol) for GE formation occurred not only through lipid oxidation but also through directly affecting the formation of cyclic acyloxonium intermediate. Additionally, a quadrupole time-of-flight tandem mass spectrometry measurement was conducted to identify the presence of radical adduct captured by 5,5-dimethylpyrroline N-oxide,, which provided strong evidence for the formation of CAFRI. Thus, one possible influencing mechanism can be that free radical generated in lipid oxidation may be transferred to dipalniitin and promote CAFRI formation. Fe3+ can catalyze free radical generation while antioxidants can scavenge free radical, and therefore they also can directly affect CAFRI formation.

关键词： glycidyl esters plant oil iron ion antioxidants lipid oxidation influencing mechanisms

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Enhancement of activity and hydrothermal stability of Pd/ZrO₂-Al₂O₃ doped by Mg for methane combustion under lean conditions

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FUEL 2017年 194卷 368-374页

作者： Hu, Wei Li, Guangxia Chen, Jianjun Huang, Fujin Gong, Maochu Zhong, Lin Chen, Yaoqiang Sichuan Univ Coll Chem Engn Chengdu 610065 Peoples R China Sichuan Univ Coll Chem Key Lab Green Chem & Technol Minist Educ Chengdu 610064 Peoples R China

By a facile doping strategy, a new Pd catalyst supported on ZrO2-Al2O3 composite doped by Mg was developed. The catalyst was carefully characterized by X-ray diffraction (XRD), CO chemical adsorption, transmission electron microscope (TEM), NH3 temperature programmed desorption (NH3-TPD) and X-ray photoelectron spectroscopy (XPS). The results revealed that the physical and chemical properties of the catalyst can be modulated by Mg dopant. An MgAl2O4 spinel was formed by Mg doping, which can stabilize Pd2+ species and inhibit the formation of hydroxyl groups on the surface of support. Compared with its analogous catalyst without Mg dopant, the Mg-doped catalyst had higher Pd dispersion and smaller Pd nanoparticles. Moreover, a more suitable acidity for methane oxidation can be generated on the surface of the catalyst upon Mg doping. Therefore, the introduction of Mg doping strongly enhanced the low temperature activity and hydrothermal resistance of the catalyst for the total oxidation of methane under lean conditions. Notably, the complete conversion temperature of methane can decreased significantly by 40-50 degrees C with the doped catalyst before and after harsh hydrothermal aging treatment. (C) 2016 Published by Elsevier Ltd.

关键词： Palladium ZrO2-Al2O3 Magnesium Methane oxidation Compressed natural gas Lean condition

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Study of single and multidigit activation in monkey somatosensory cortex using voltage-sensitive dye imaging

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NEUROPHotONICS 2017年第3期4卷 031219页

作者： Roe, Anna Wang Winberry, Jeremy E. Friedman, Robert M. Zhejiang Univ Qiushi Acad Adv Studies Interdisciplinary Inst Neurosci & Technol Hangzhou Zhejiang Peoples R China Oregon Hlth & Sci Univ Oregon Natl Primate Res Ctr Div Neurosci Beaverton OR USA Vanderbilt Univ Dept Psychol Nashville TN 37240 USA Univ Chicago Dept Organismal Biol & Anat 1025 E 57Th St Chicago IL 60637 USA

Toward the goal of understanding cutaneous sensory integration during manual behavior, we used voltage-sensitive dye (VSD) imaging to study the organization and dynamics of anesthetized monkey primary somatosensory cortex (SI) in response to single and multidigit tactile stimulation. We find that in both macaque and squirrel monkey SI, VSD reveals clear focal digit topography consistent with previous electrophysiological and intrinsic signal imaging studies. VSD also reveals interactions in SI in response to multidigit stimulation. With a tactile funneling paradigm in areas 3b and 1 in squirrel monkeys, VSD reveals two-digit induction of subthreshhold influences, consistent with lateral intracortical inhibition. In response to tactile apparent motion stimuli, VSD reveals preferential response to motion stimuli over static tactile stimuli in both areas 1 and 3b. Comparison of the response at different digit locations to "toward digit" stimuli suggests the presence of direction-selective response in area 1;however, further study is needed. These exciting results indicate that VSD constitutes a powerful tool for studying somatosensory cortical processing in nonhuman primates and should be further developed for future somatosensory studies in awake behaving monkeys. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.

关键词： nonhuman primate somatosensory cortex optical imaging voltage-sensitive dye imaging motion funneling

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Cross-Modal Recipe Retrieval: How to Cook this Dish? 23rd

Cross-Modal Recipe Retrieval: How to Cook this Dish?

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23rd International Conference on MultiMedia Modeling (MMM)

作者： Chen, Jingjing Pang, Lei Ngo, Chong-Wah City Univ Hong Kong Dept Comp Sci Kowloon Tong Hong Kong Peoples R China

ISBN: (纸本)9783319518114;9783319518107

In social media users like to share food pictures. One intelligent feature, potentially attractive to amateur chefs, is the recommendation of recipe along with food. Having this feature, unfortunately, is still technically challenging. First, the current technology in food recognition can only scale up to few hundreds of categories, which are yet to be practical for recognizing ten of thousands of food categories. Second, even one food category can have variants of recipes that differ in ingredient composition. Finding the best-match recipe requires knowledge of ingredients, which is a fine-grained recognition problem. In this paper, we consider the problem from the viewpoint of cross-modality analysis. Given a large number of image and recipe pairs acquired from the Internet, a joint space is learnt to locally capture the ingredient correspondence from images and recipes. As learning happens at the region level for image and ingredient level for recipe, the model has ability to generalize recognition to unseen food categories. Furthermore, the embedded multi-modal ingredient feature sheds light on the retrieval of best-match recipes. On an in-house dataset, our model can double the retrieval performance of DeViSE, a popular cross-modality model but not considering region information during learning.

关键词： Recipe retrieval Cross-modal retrieval Multi-modality embedding

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