IEEJ Transactions on Electronics, Information and Systems
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
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Volume 133, Issue 4
Displaying 1-34 of 34 articles from this issue
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Special Issue on “Information and System Technologies for Creating a New Service Society”
Special Issue Review
  • Systems' Approaches for Service Science
    Michitaka Kosaka, Motohisa Funabashi, Hiroshi Tsuji
    2013 Volume 133 Issue 4 Pages 688-692
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.688
    JOURNAL FREE ACCESS
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    This paper proposes systems' approaches for service science. There are several new approaches for service science. Vargo proposed Service Dominant Logic (SDL), which determines service value according to “value in use”. Kameoka and Oda defined service as supporting activities. Based on such new trends, we developed the concept of service system to maximize service value for customers. The service system requires 3 types of technologies, which are human analysis technologies, service optimization technologies and technologies for service value co-creation. The service science is very important for business in the 21st century.
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  • How Can We Co-Create Customer Value?
    Masaharu Akatsu, Chiaki Hirai, Haruko Nagaoka
    2013 Volume 133 Issue 4 Pages 693-698
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.693
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    People's sense of value becomes more multifaceted. Therefore, it is required for the service providers to co-create customer value through interaction with customers. In this paper, we insist that the design science is effective as an approach of co-creating customer value, and introduce some concrete technology and methodology to measure, design, and evaluate customer value.
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Special Issue Paper
<Systems, Instrument, Control>
  • The Proposal of the Remote Consultation Service System using the Outline Function for Consultation
    Takuto Goto, Hiroshi Yajima
    2013 Volume 133 Issue 4 Pages 699-705
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.699
    JOURNAL FREE ACCESS
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    Remote welfare services for caregivers have recently been offered in response to the recent increase in demand for care that has accompanied the aging of society. However, due to the often extended periods of caregiving involved, care consultations can sometimes lack cohesion unless information about the early stages of care are available. In order to address this issue, the whole history of communication between care experts and family members should be structured and visualized when remote welfare services are provided. We propose a form of remote consultation where care experts can offer coherent and efficient consultations using all available information, such as up-to-date information from “lifelogs” and past processes of care consultations obtained from the use of all historically available information.
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  • Sensing of Audience Excitation and Boredom Emotion Based on the Synchrony of Sitting Body Sway
    Ryo Wataya, Daisuke Iwai, Kousuke Sato
    2013 Volume 133 Issue 4 Pages 706-712
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.706
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    More and more recent studies about emotion estimation have taken an ambient sensing approach, where users are monitored without constraining their bodies and consciousness of sensing systems. Few of them, however, are intended to audience emotions. The authors aimed to examine that audience emotions, which is difficult to be estimated by using only individual data, become to be estimated more easily by the ambient sensing of synchrony of multiple users. We developed the ambient sensing chair, which employs wireless sensors to determine the center of force of seated users, and designed an experiment on the audience watching soccer game on TV or technical presentation to examine the relationship between audience body sways and their emotions in a natural situation. As a result, synchrony could be well correlated to their excitation and boredom, which were not observed from individual data. These results indicate the possibility of the development of service marketing systems that evaluate TV contents and feedback systems that give notice of audience emotions to the presenter.
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  • Development of Indoor Positioning System by Using the Infrared Rays Data Communication Tags for Pedestrian Navigation
    Hiromune Namie, Masafumi Nakagawa
    2013 Volume 133 Issue 4 Pages 713-721
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.713
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    In the present study, we focused on the development of an indoor positioning system that is easy to use, portable and universally accessible. This system is capable of providing correct positional information anywhere indoors. Although GPS exhibits superior performance outdoors, there has been a considerable amount of research into indoor position determination by means of high-sensitivity GPS, pseudolites (GPS pseudo satellite), RFID (Radio Frequency IDentification) tags, and wireless LAN. However, the positioning rate, precision, radio signal interference, and cost performance levels of such technologies are still not high enough for general use, which is why they have not yet spread to pedestrian navigation systems. As a potential remedy, we created and examined an indoor positioning system using standard cellular phones with built-in GPS and infrared rays data communication functionalities, which are in widespread use in Japan. By this research, although indoor positioning of target precision 10 m required for pedestrian navigation has been realized in the comparatively narrow range, you still have to improve in respect of the rate of positioning.
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<Speech and Image Processing, Recognition>
  • Model-based Alignment using Evolutionary Computation and Particle Filter in a Non-messy Place
    Taiki Fuji, Yasue Mitsukura
    2013 Volume 133 Issue 4 Pages 722-729
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.722
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    In this paper, we propose a model-based alignment system using evolutionary computation and particle filter for augmented reality (AR). AR is a technique to overlay useful virtual information on the real world. To realize the AR, alignment between real space and virtual space is a serious problem. In particular, an initial frame alignment for real-time tracking is needed in the prior knowledge based alignment. Therefore, we propose an alignment method using evolutionary computation for the initial frame alignment. In this paper, we use the multiple evolutionary computation methods for designing an effective method of alignment system. Moreover, we conduct tracking of the alignment target using particle filter based on the initial frame alignment results. By using this system, a model-based alignment can be conducted in a non-messy place such as being hard to acquire many feature points.
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<Softcomputing, Learning>
  • Reactive Scheduling of Job Processing against Machine Breakdowns for Non-disruptive Cell Manufacturing Systems
    Wan-Ling Li, Muhammad Hafidz Fazli bin Md Fauadi, Tomohiro Murata
    2013 Volume 133 Issue 4 Pages 730-739
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.730
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    This paper proposes a novel method of reactive scheduling of job processing for non-disruptive cell manufacturing systems (CMS) against unexpected machine breakdown occurrence. Reactive scheduling problem for reassigning pending jobs in CMS is formulated as a discrete optimization problem based on Integer Programming (IP) and effective solving method of BPSO-SA which consists of hybridized Binary Particle Swarm Optimization (BPSO) and Simulated Annealing (SA) methods is proposed to cope with time-critical recovery situation. BPSO is adopted to explore near optimal feasible solution of the discrete rescheduling problem and SA is used for the global optimization of locating a good approximation to the global optimum in a large search space. Numerical experiment demonstrates the effectiveness of the proposed model through case problems of non-disruptive jobs processing in CMS with unexpected machine breakdowns to seek for multiple objectives to minimize tardiness, number of intercellular movements, as well as maximizing cell load balancing. The results show that BPSO-SA provides a near optimal solution with significant reduction of calculation time compared to IP-based mathematical optimization method.
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<Information System, Electronic Commerce>
  • Development of Recommendation System for a Leasehold House for Students with Conditional Search and Reducts Rule in Rough Set
    Masaki Yumoto
    2013 Volume 133 Issue 4 Pages 740-748
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.740
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    Many new college or university students use the housing conditional search system for a leasehold house on Web recently. This system is difficult to deal with unclear request which has a relation of a trade-off. Reducts rule in rough set can extract the house according to the request. However, creating the rules gives the user a great load about evaluation, and the user may be unable to obtain clear result. This is because rough set is a concept which treats uncertainly.
    This paper presents the recommendation system for a leasehold house for students with conditional search and reducts rule in rough set. This system performs conditional search using housing information, and evaluate desirable houses by reducts rule in rough set. Through the experiment, it is confirm that the system can recommend houses which the user satisfied.
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  • A Hybrid Method Using Multidimensional Clustering-based Collaborative Filtering to Improve Recommendation Diversity
    Xiaohui Li, Tomohiro Murata
    2013 Volume 133 Issue 4 Pages 749-755
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.749
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    This paper describes a hybrid recommendation approach for discovering individual users' potential preferences from multidimensional clustering view. The proposed approach aims to help users reach a decision to meet their diverse demands and provide the target user with highly idiosyncratic or more diverse recommendations. To this end, we propose a hybrid approach that incorporates multidimensional clustering into a collaborative filtering recommendation model to provide a quality recommendation. The proposed approach also provides a flexible solution for improving recommendation diversity and achieves a tradeoff between recommendation accuracy and diversity. The performance of proposed approach is evaluated using a public movie dataset and compared with two representative recommendation algorithms. The empirical results demonstrate that our proposed approach performs superiorly on increasing recommendation diversity while maintaining recommendation accuracy.
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  • An Anonymous Off-line Credit Card System based on ITLs
    Yusuke Ohashi, Shinsuke Tamura, Shuji Taniguchi
    2013 Volume 133 Issue 4 Pages 756-768
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.756
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    This paper proposes a scheme for anonymous off-line credit card systems that enables card holders to purchase goods from shops anonymously while being disconnected from card companies, i.e. without using information maintained by card companies or other shops. The proposed scheme is an extension of the one for anonymous on-line credit card systems that had been proposed already. As same as the on-line scheme, the proposed scheme does not assume any absolutely trusted neutral entity or tamper resistant device.
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  • Clap Based Questionnaire for Evaluating Experiential Value and Its Effects to Services Marketing
    Kunio Shirahada, Michitaka Kosaka
    2013 Volume 133 Issue 4 Pages 769-776
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.769
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    Service providers need to understand customers' experiential values to improve their service quality. In this paper, we made a touch-panel based clapping device to obtain experiential values on the basis of Schmitt's five experiential marketing modules: Sense, Feel, Think, Act, and Relate. We conducted an experiment in Ishikawa zoo, Japan to verify its impact on services marketing. In the experiment, six examinees walked and viewed animals using the device and answered questions about usability after viewing all attractions. As a result, the tool is highly available for drawing customer experiences and helps to design service processes for providers.
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  • A Service Value Creation Model Based on Sharing Service Experience and its Application to Korean Language Education
    Wooseok Dong, Kunio Shirahada, Michitaka Kosaka
    2013 Volume 133 Issue 4 Pages 777-784
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.777
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    In this paper, we propose a service value creation model based on sharing service experience. Experiences for services still remain in customers' brain or heart after the services are finished. Our main aim is to share customers' experiences and find suitable service by analyzing information shared after service providing. In the proposed model, the direct service field and the indirect service field are prepared. In the indirect service field, customers share their service experience by using Information Technology (Web2.0, Social network). Suitable services can be found by analyzing information in the indirect service field. The effectiveness of this new model is demonstrated through its application to Korean language education.
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  • A Geographical Content Delivery Method Using Rete Algorithm for Large Scale Context-Aware Service
    Tomoya Kawakami, Yuuichi Teranishi, Kaname Harumoto, Shinji Shimojo
    2013 Volume 133 Issue 4 Pages 785-793
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.785
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    In this paper, we propose a geographical content delivery method that is suitable for large-scale context-aware services. Our method assumes geographically distributed and huge number of contents which include sensors, restaurant information etc. To treat context-aware content delivery, our method reasons contexts and filters effective contents on the basis of specific rules. The rules are processed using Rete algorithm and Rete network is constructed on the distributed nodes. The processes in the Rete network are distributed by dividing entire world into geographical blocks. The process assignment to nodes are based on the rules and geographical blocks using DHT (Distributed Hash Table). The proposed method reduces the redundancy that occurs when same requests are issued from different users, by sharing the results of reasoning including intermediate results. We evaluated our proposed method by simulations and confirmed that it can distribute the communication loads among nodes in network and reduces processes by utilizing the processed results.
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<Information Processing, Software>
  • A Methodology for Software Development Support based on Service Value Co-creation
    Noriko Wada, Michitaka Kosaka
    2013 Volume 133 Issue 4 Pages 794-801
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.794
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    In response to ever increasing development size and complexity, many software development organizations have conducted various activities to improve the capabilities of software development. However, we have seen great variability in the outcomes of these activities, and that such variability has been attributed primarily to the skills and experiences of promoters of individual support activities. In this paper, we propose a methodology to software development support activities based on service value co-creation which contains embedded implicit knowledge of experienced promoters. This methodology was developed by viewing these support activities as services provided to the software organization, and by analyzing the relationship between support activities and outcomes from the perspective of service science. Finally, we demonstrate the validity of this methodology by analyzing three actual cases of software development capability improvement activities in light of this methodology.
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  • A Pre-Control System to Edit Contents with an Extended Sanitizable Signature
    Masaki Inamura, Akira Saito, Keiichi Iwamura
    2013 Volume 133 Issue 4 Pages 802-815
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.802
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    Recently we need a new copyright protection system for a UGC (User Generated Content) in CGM (Consumer Generated Media) markets, which is generally made with re-use of existing content files. In this paper, we propose a new system that enables to pre-control editing contents with a digital signature from the viewpoint of editing control. Existent sanitizable signatures, which can only delete contents, are extended, and it is feasible to set up a work of editing as alteration, deletion and insertion including permission to edit contents. Therefore a content user can edit contents within the range of creator's permission.
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Special Issue Letter
<Media Information, User Interface>
<Information System, Electronic Commerce>
  • Development of Cloud Service for Interconnect Testing on HEMS Devices
    Hiroshi Sugimura, Kazuo Sekiya, Tomoki Watanabe, Masao Isshiki
    2013 Volume 133 Issue 4 Pages 818-819
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.818
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    This paper develops a web service for interconnect testing on HEMS devices. In order to improve ecology and usefulness of consumer devices, the development acceleration of the HEMS devices is important. However, an implementation of communications protocol is large cost of development. Especially, interconnect testing effects them. We thus develop an emulator provided by web service for the testing. By using set of scenarios which provide behaviors of ECHONET Lite node for tests, the system has a capability to correspond to the specification change.
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  • Demonstration Experiments of Location Information Delivery System in Toyama Light Rail Transit
    Keiji Shibata, Kunimitsu Fujita, Yuukou Horita
    2013 Volume 133 Issue 4 Pages 820-821
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.820
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    It is very important for them to reduce the waiting time at tram station when residents and visitors do not know the tram timetable. In order to accomplish that, we propose a tram location and route navigation system by using smartphone. The system is able to easily retrieve information about tram's locations obtained by GPS. It also can providing users with the shortest walking route to the nearest tram station. For evaluating the usefulness of this system, we performed the demonstration experiments on an actual LRT system “Centram” in the center of Toyama city.
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Paper
<Systems, Instrument, Control>
  • Operation Optimization of Factory Power Generation Plant Considering an Uncertainty
    Shoichi Kitamura, Kazuyuki Mori, Yoshio Izui, Toshiyuki Miyamoto, Shig ...
    2013 Volume 133 Issue 4 Pages 822-830
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.822
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    Factory power generation plants supply electricity and heat to the manufacturing lines. Because the demands for electricity and heat are uncertain, the power plant must adjust its output to match the demand and to avoid the violation of constraints such as the inverse load flow of electricity. Conventionally, these violations have been avoided by purchasing surplus power. However, the surplus power raises the energy cost. There exists an optimization method, which considers the uncertainty in the demands for co-generation systems, and implements a triangle function to approximate its probability distribution. However, using a triangle function, this method does not consider the tail of the probability distribution. In this paper, a new operation optimization method considering uncertainty in the demands of electricity and heat for factory power generation plants is proposed. The proposed method aims to avoid violations of constraints and to reduce the energy cost. Through simulation experiments, the validity of the proposed method is confirmed.
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  • Supersonic Distance Meter System Using Chaos Signal with FPGA
    Yuki Kimata, Norio Tsuda, Yasuhiko Nawa, Jun Yamada
    2013 Volume 133 Issue 4 Pages 831-836
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.831
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    Recently, supersonic sensors for measuring short distance at low cost with relative high accuracy are widely used for collision avoidance sensor for automatic vehicle and robots. However, supersonic sensors may malfunction by sound noise in factories or by interference with another supersonic sensor. Then, new type of supersonic sensor has been studied, in which a chaos signal is used. The on-line measurement system is developed by using FPGA in the signal processing. This sensor system can measure a distance up to 10m with error of 2.2%. It is confirmed that this system is resistant to a sound noise or interference with another supersonic sensor.
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  • Feed-forward Controller Reduction by the Block Balanced Truncating
    Tsutomu Nagado, Kentaro Asato
    2013 Volume 133 Issue 4 Pages 837-842
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.837
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    In this paper, we propose a new reduction method of the feed-forward controller. In the method we employ the block balanced truncating technique which can consider the structure of the control systems. The block balanced truncating method are usually used for the feed-back controller reduction. But it is also applicable to reduction of the other subsystems. The two-degree-of-freedom control system has the feed-forward controller to expand achievable transfer property. Reduction of the feed-forward controller can contribute for simplification of control systems totally. A numerical example is illustrated to show the effectiveness of our method.
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  • Tracking Performance of Active Noise Control System Using SSCF Adaptive Algorithm for Change of Acoustic Path
    Masaki Kobayashi, Yasunori Nagasaka, Yoshio Itoh
    2013 Volume 133 Issue 4 Pages 843-848
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.843
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    In this paper, a tracking performance of the SSCF-ANC system for the change of the acoustic path is considered. It is known that the SSCF (Square Sum of Correlation Function) adaptive algorithm estimating the inverse transfer function of the unknown system is robust for the sound noise added at the input. The high tracking speed can be obtained with the inhibition of the adaptive control when a certain evaluation value is negative. The numerical verifications of the tracking performance of this system are also presented.
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<Intelligence, Robotics>
  • An Inchworm-type Multi-DOF Stage
    Akihiro Torii, Tomohiro Yamada, Ryosuke Kamiya, Akiteru Ueda, Kae Doki
    2013 Volume 133 Issue 4 Pages 849-855
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.849
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    This paper describes an inchworm-type multi-degree-of-freedom stage, which consists of a platform, linear links and a base. The stage is based on a self-propelled Stewart-platform. We use six stacked-type piezoelectric actuators as the linear links. Six electromagnets are used in the stage. The electromagnets connect the linear links to the base and to the platform. This structure enables the Stewart-platfom to move on a surface by using the principle of an inchworm. The platform supported by the linear links is also operated by the principle of an inchworm, which enables the platform to rotate in the tilt directions. While the electromagnets fix the linear actuators on the base, the platform of the proposed stage realizes a precise multi-DOF motion. Design, principle, and control signals are described. The position and orientation of the moving platform is measured, and some experimental results indicate the feasibility of the proposed stage. The mechanism is effective for a precise positioning system which has a wide working area.
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  • Two-Stage Reinforcement Learning on Credit Branch Genetic Network Programming for Mobile Robots
    Siti Sendari, Shingo Mabu, Kotaro Hirasawa
    2013 Volume 133 Issue 4 Pages 856-863
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.856
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    This paper proposes Two-Stage Reinforcement Learning on Credit Branch Genetic Network Programming named GNP-TSRL-CB for mobile robots. The proposed method uses 2 kinds of Q-tables for sub node selection and credit branch selection, which has advantages of (1) determining an alternative function by using sub node selection and (2) skipping useless functions by using credit branch selection. It is clarified from simulation results that the adaptability mechanism of the proposed method can improve the performance compared with the conventional methods when the individuals of GNP-TSRL-CB are implemented in the dynamic environments like the sudden changes occur.
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<Speech and Image Processing, Recognition>
  • Grouping and Relation Estimation of Walking People based on Face Direction and Mouth Aperture
    Takayuki Yoshida, Masafumi Otsuki, Akio Nakamura
    2013 Volume 133 Issue 4 Pages 864-875
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.864
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    We are developing a system that groups pedestrians and identifies relation. After detecting multiple persons from input image, the system observes their faces and groups them based on estimation of distance and conversation. Conversation is detected from face direction and mouth opening. To track feature points in the small and low-resolution face image, we use an Active Appearance Model (AAM). In addition, the system needs to observe not only faces used in the training but also ones of others to deal with unspecified persons. To cope with change in face orientation, we prepare three types of face models (left / front / right views). To reduce the amount of training data of AAM, we consider that only one face is used as base face to create the model. The face parts of eye and nose extracted from the created face model are randomly moved and deformed to fit on the face of others. Thus, the model obtained by learning from one person is applied to others and the feature tracking gets robustness. The system judges whether they make a conversation with Support Vector Machine (SVM) using face direction and mouth opening. Experimental results show effectiveness of the proposed method.
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  • Three Dimensional Rotation-Free Camera-based Character Recognition
    Ryo Narita, Wataru Ohyama, Tetsushi Wakabayashi, Fumitaka Kimura
    2013 Volume 133 Issue 4 Pages 876-882
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.876
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    In this paper, we propose a new method for three dimensional rotation-free recognition of characters in scene. In the proposed method, we employ the Modified Quadratic Discriminant Function (MQDF) classifier trained with samples generated by three dimensional rotation process in a computer. We assume that when recognizing individual characters, considering three dimensional rotation can approximately handle the recognition of characters with perspective distortion. The results of the evaluation experiments using printed alphanumeric characters as an evaluation data set, consisting of approximately 600 samples per class for 62 character classes, show that the recognition rate is 99.34% for rotated characters while it is 99.59% for non rotated characters. We have empirically confirmed that the rotated characters given as the training data set do not negatively affect significantly to recognition of non rotated characters. Moreover, 813 characters extracted from 58 camera-captured scenes were correctly recognized and the feasibility of real world application of our method has been confirmed.
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<Information System, Electronic Commerce>
  • A Reconfiguration Method of Bug Thread Hierarchy by Similarities Weighted with Dependent Relationships
    Yuuki Imanara, Masaki Samejima, Masanori Akiyoshi
    2013 Volume 133 Issue 4 Pages 883-890
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.883
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    This paper addresses a problem to reconfigure a bug thread hierarchy in bug tracking systems. The bug thread hierarchy consists of dozens of bug threads that have dependent relationships each other, and the hierarchy is reconfigured when a recent bug thread is posted. Not only bug threads that have dependent relationships with the recent bug threads but also their dependent targets or sources are similar to the recent bug thread. In our proposed method, similarities with dependent targets and dependent sources are weighted to the similarity with the bug thread, and the bug thread that has the highest weighted similarity is identified to have a dependent relationship with a recent bug thread. The dependent direction is decided by the similarity with dependent targets and sources. As a result of the experiment, the hierarchy of the bug threads is reconfigured at a correct rate of 81%.
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  • Dynamic Load-balancing and Control for Server-Side Rendering on Ajax-GIS
    Takeo Sakairi, Masashi Watanabe, Katsuyuki Kamei, Takashi Tamada, Yuki ...
    2013 Volume 133 Issue 4 Pages 891-898
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.891
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    This paper presents the methods of dynamic load-balancing and control, which are applied for server-side rendering on Ajax-GIS. Ajax-GIS uses divided raster image tiles called for “tile” in order to keep light handling on web browser without some additional plug-in software. Server-side rendering is a technique for drawing images on the server side, which is effective to be able to solve the cross-browser issues and to reduce the client load. However when many clients request the Ajax-GIS server to render tile images, the server load will increase. In order to this issue, we propose the dynamic load-balancing and control by means of estimating server-side rendering request and monitoring server load. In experiments and evaluations of our proposed methods making use of an actual map data, we confirmed the effectiveness of our methods as comparing with conventional methods.
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  • An Identification Method of Risks in Project Plan Document by Automatic Acquisition of Risk Expression
    Yuuki Imanara, Daisuke Nakajima, Masaki Samejima, Masanori Akiyoshi, H ...
    2013 Volume 133 Issue 4 Pages 899-905
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.899
    JOURNAL FREE ACCESS
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    This paper addresses a problem to identify risks in project plan documents written by project managers. Because some project managers express risks without negative words, the risk identification method by negative expressions is not sufficient to identify them. In this paper, we propose a risk identification method by automatic acquisition of risk expressions. The proposed method acquires the risk expressions from existing project plan documents based on the frequency of appearance in the sentences indicating risks. After the acquisition of the risk expressions, the proposed method extracts sentences including the expressions. From the extracted sentence, the proposed method identifies risks by comparing the sentence to each item of the checklist. In particular, the proposed method identifies the items corresponding to each extracted sentence by using related words. The experimental result shows that the proposed method identifies 81% of risks in the checklist and 45% of risks outside of the checklist on average.
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Letter
<Media Information, User Interface>
<Speech and Image Processing, Recognition>
  • Sharpness-enhancing Enlargement of Terahertz Images
    Oh-Kyu Kwon, Seong G. Kong
    2013 Volume 133 Issue 4 Pages 908-909
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1541/ieejeiss.133.908
    JOURNAL FREE ACCESS
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    This paper presents non-parametric sharpness-enhancing enlargement technique for Terahertz images that combines spatial interpolation and discrete wavelet transform (DWT) reconstruction. The proposed algorithm finds the details from a DWT analysis of an interpolated version, then an inverse DWT of the details and the approximation rescaled from the input image produces an enlarged image. The computer simulation shows the proposed method shows higher peak signal-to-noise ratio and the sharpness measured by Tenengrade and sum-modulus-difference (SMD) than popular image enlargement algorithms.
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