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| 1 | Gfarm/BB——Gfarm File System for Node-Local Burst Buffer显示文摘Burst buffer has become a major component to meet the I/O performance requirement of HPC bursty traffic.This paper proposes Gfarm/BB that is a file system for a burst buffer efficiently exploiting node-local storage systems.Although node-local storages improve storage performance,they are only available during the job allocation.Gfarm/BB should have better access and metadata performance while it should be constructed on-demand before the job execution.To improve the read and write performance,it exploits the file descriptor passing and remote direct memory access(RDMA).It improves the metadata performance by omitting the persistency and the redundancy since it is a temporal file system.Using RDMA,writes and reads bandwidth are improved by 1.7x and 2.2x compared with IP over InfiniBand(IPoIB),respectively.It achieves 14700 operations per second in the directory creation performance,which is 13.4x faster than the fully persistent and redundant case.The construction of Gfarm/BB takes 0.31 seconds using 2 nodes.IOR benchmark and ARGOT-IO application I/O benchmark show the scalable performance improvement by exploiting the locality of node-local storages.Compared with BeeOND,Gfarm/BB shows 2.6x and 2.4x better performance in IOR write and read benchmarks,respectively,and it shows 2.5x better performance in ARGOT-IO. | Osamu Tatebe Member ACM Shukuko Moriwake Yoshihiro Oyama | 2020 | Journal of Computer Science & Technology2020，35，1： | 0 |
| 2 | ROAD+:Route Optimization with Additional Destination-Information and Its Mobility Management in Mobile Networks显示文摘In the NEtwork MObility(NEMO) environment,mobile networks can form a nested structure.In nested mobile networks that use the NEMO Basic Support(NBS) protocol,pinball routing problems occur because packets are routed to all the home agents of the mobile routers using nested tunneling.In addition,the nodes in the same mobile networks can communicate with each other regardless of Internet connectivity.However,the nodes in some mobile networks that are based on NBS cannot communicate when the network is disconnected from the Internet.In this paper,we propose a route optimization scheme to solve these problems.We introduce a new IPv6 routing header named'destination-information header'(DH),which uses DH instead of routing header type 2 to optimize the route in the nested mobile network.The proposed scheme shows at least 30%better performance than ROTIO and similar performance improvement as DBU in inter-route optimization.With respect to intra-route optimization,the proposed scheme always uses the optimal routing path.In addition,the handover mechanism in ROAD+ outperforms existing schemes and is less sensitive to network size than other existing schemes. | Moonseong Kim Matt W. Mutka Member, ACM Senior Member Jeonghoon Park Hyunseung Choo | 2010 | Journal of Computer Science & Technology2010，25，2： | 0 |
| 3 | Designing Motion Gesture Interfaces in Mobile Phones for Blind People显示文摘Despite the existence of advanced functions in smartphones,most blind people are still using old-fashioned phones with familiar layouts and dependence on tactile buttons.Smartphones support accessibility features including vibration,speech and sound feedback,and screen readers.However,these features are only intended to provide feedback to user commands or input.It is still a challenge for blind people to discover functions on the screen and to input the commands.Although voice commands are supported in smartphones,these commands are difficult for a system to recognize in noisy environments.At the same time,smartphones are integrated with sophisticated motion sensors,and motion gestures with device tilt have been gaining attention for eyes-free input.We believe that these motion gesture interactions offer more efficient access to smartphone functions for blind people.However,most blind people are not smartphone users and they are aware of neither the affordances available in smartphones nor the potential for interaction through motion gestures.To investigate the most usable gestures for blind people,we conducted a user-defined study with 13 blind participants.Using the gesture set and design heuristics from the user study,we implemented motion gesture based interfaces with speech and vibration feedback for browsing phone books and making a call.We then conducted a second study to investigate the usability of the motion gesture interface and user experiences using the system.The findings indicated that motion gesture interfaces are more efficient than traditional button interfaces.Through the study results,we provided implications for designing smartphone interfaces. | Nem Khan Dim 任向实 Senior Member ACM IEEE | 2014 | Journal of Computer Science & Technology2014，29，5： | 0 |
| 4 | Assisting Visually Impaired People to Acquire Targets on a Large Wall-Mounted Display显示文摘Large displays have become ubiquitous in our everyday lives,but these displays are designed for sighted people.This paper addresses the need for visually impaired people to access targets on large wall-mounted displays.We developed an assistive interface which exploits mid-air gesture input and haptic feedback,and examined its potential for pointing and steering tasks in human computer interaction(HCI).In two experiments,blind and blindfolded users performed target acquisition tasks using mid-air gestures and two different kinds of feedback(i.e.,haptic feedback and audio feedback).Our results show that participants perform faster in Fitts’law pointing tasks using the haptic feedback interface rather than the audio feedback interface.Furthermore,a regression analysis between movement time(MT)and the index of difficulty(ID)demonstrates that the Fitts’law model and the steering law model are both effective for the evaluation of assistive interfaces for the blind.Our work and findings will serve as an initial step to assist visually impaired people to easily access required information on large public displays using haptic interfaces. | Kibum Kim Member ACM IEEE 任向实 Senior Member | 2014 | Journal of Computer Science & Technology2014，29，5： | 0 |
| 5 | Harnessing the Power of GPUs to Speed Up Feature Selection for Outlier Detection显示文摘Acquiring a set of features that emphasize the differences between normal data points and outliers can drastically facilitate the task of identifying outliers. In our work, we present a novel non-parametric evaluation criterion for filter-based feature selection which has an eye towards the final goal of outlier detection. The proposed method seeks the subset of features that represent the inherent characteristics of the normal dataset while forcing outliers to stand out, making them more easily distinguished by outlier detection algorithms. Experimental results on real datasets show the advantage of our feature selection algorithm compared with popular and state-of-the-art methods. We also show that the proposed algorithm is able to overcome the small sample space problem and perform well on highly imbalanced datasets. Furthermore, due to the highly parallelizable nature of the feature selection, we implement the algorithm on a graphics processing unit(GPU)to gain significant speedup over the serial version. The benefits of the GPU implementation are two-fold, as its performance scales very well in terms of the number of features, as well as the number of data points. | Fatemeh Azmandian Member, IEEE, Ayse Yilmazer Student Member, IEEE, Jennifer G. Dy Member, IEEE Javed A. Aslam IEEE, Jennifer G. Dy Member, ACM David R. Kaeli Fellow, IEEE, Member, ACM | 2014 | Journal of Computer Science & Technology2014，29，3： | 0 |
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