Nishi-Tokyo-shi, Japan
Nishi-Tokyo-shi, Japan

Komazawa University is one of the oldest universities in Japan. Its history starts in 1592, when a seminary was established to be a center of learning for the young monks of the Sōtō sect, one of the two main Zen Buddhist traditions in Japan.The university in Tokyo campus comprises eight faculties and 22 departments with a total of around 16,000 students. Also for students who wish to pursue advanced studies, each department has a graduate school except the Department of Radiological science. It also has seven research institutes and a Museum of Zen Buddhist Culture. Wikipedia.

Time filter

Source Type

Yoshida N.,Komazawa University
Communications in Computer and Information Science | Year: 2015

In this paper, a mutual resource exchanging model in mobile computing environment and its application to data analysis are introduced. Resource exchanging is a key issue in data analysis because the only way for efficient use of limited resources in mobile environment is exchanging them each other. Also this paper presents the applicability of this model by showing applications of (1) a universal battery, (2) bandwidth sharing, (3) a 3D movie production by collective intelligence, and, (4) mobile data analysis for motion sensors. By showing results of data analysis, the applicability of this model will be clarified. © Springer International Publishing Switzerland 2015.

Suzuki S.,Komazawa University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

Vagueness is a ubiquitous feature that we know from many expressions in natural languages. It can invite a serious problem: the Sorites Paradox. The aim of this paper is to proposed a new version of complete logic for vague predicates - salient-similarity-based vague predicate logic (SVPL) that can avoid the Sorites Paradox and give answers to all of the Semantic Question, the Epistemological Question and the Psychological Question given by Graff. © 2011 Springer-Verlag.

Iida T.,Komazawa University | Zipkin P.,Duke University
Operations Research | Year: 2010

We consider a serial supply chain with one supplier and one retailer. Each obtains some demand forecast information, which may be shared or not. We investigate the members' benefits from sharing information. The forecasts follow a variant of the Martingale model of forecast evolution (MMFE). We construct a simple transfer-payment scheme to align the players' incentives with that of the overall system. The main finding is that, unless the players' incentives are aligned in this way, sharing information makes little sense. It might hurt one or the other player and the system as a whole. ©2010 INFORMS.

Iida T.,Komazawa University
International Journal of Production Economics | Year: 2015

Abstract This paper studies both the benefits of leadtime information and the interrelationships among demand forecast information, leadtime uncertainty, and leadtime information, for improving inventory control performance. To this end, it explicitly incorporates both leadtime information and demand forecast information into an inventory model although they have conventionally been dealt with individually in the literature. Specifically, it considers a periodic-review inventory model with uncertain leadtimes, in which both leadtime information and demand forecast information are available. The leadtime information is modeled as the information of the arrival of outstanding orders and the demand forecast information as the Martingale Model of Forecast Evolution (MMFE). The paper analyzes the way to use both leadtime information and demand forecast information for inventory control operations. Specifically, under certain conditions, the optimality of the state-dependent base-stock policy is shown, and an effective heuristic policy is developed. It also derives some managerial insights for exploiting both leadtime information and demand forecast information in the case where leadtimes are uncertain. For instance, while leadtime information itself significantly improves inventory control performance, it also enhances the benefits of demand forecast information. Specifically, the benefits of demand forecast information may significantly decrease as leadtime uncertainty increases. However, the decrease of the benefits of demand forecast information may be alleviated with leadtime information. © 2015 Elsevier B.V. All rights reserved.

We consider a discrete-time two-dimensional process {(Ln (1),Ln (2))} on ℤ+ 2 with a background process {Jn} on a finite set, where individual processes {Ln (1)} and {Ln (2)} are both skip free. We assume that the joint process {Yn}={(Ln (1),Ln (2)},Jn)} is Markovian and that the transition probabilities of the two-dimensional process {(Ln (1),Ln (2))} are modulated depending on the state of the background process {Jn}. This modulation is space homogeneous, but the transition probabilities in the inside of ℤ+ 2 and those around the boundary faces may be different. We call this process a discrete-time two-dimensional quasi-birth-and-death (2D-QBD) process, and obtain the decay rates of the stationary distribution in the coordinate directions. We also distinguish the case where the stationary distribution asymptotically decays in the exact geometric form, in the coordinate directions. © 2012 Springer Science+Business Media, LLC.

Suzuki S.,Komazawa University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

Two approaches have predominated in research on the semantics of gradable adjectives: the Vague Predicate Analysis and the Scalar Analysis. Kennedy discusses four problems of the Vague Predicate Analysis, the two of which can be regarded as main: the Cross-Polarity Problem and the (In)commensurability Problem. The aim of this paper is to propose a new version of logic for gradable adjectives-Gradable-Predicate Logic (GPL). The model of the language of GPL is based on the Vague Predicate Analysis, and can give an answer both to the Cross-Polarity Problem and to the (In)commensurability Problem. © 2012 Springer-Verlag.

Washio S.,Komazawa University | Yamada S.,Niigata University
Expert Systems with Applications | Year: 2013

Data envelopment analysis (DEA) has been developed as a method to evaluate efficiency of Decision Making Unit (DMU). In order to analyze DMU in detail, each DEA model is formulated as a mathematical programming problem utilizing the values of inputs and outputs of all DMUs as coefficients. Each DMU is evaluated by a different weight. Then, the efficiency score of each DMU is determined by using an advantageous weight for itself. In general, the efficiency score is obtained by selecting the most advantage weight. In some real cases, seeking the best ranking is sometimes more important than maximizing the efficiency score. In this paper, we propose a model called rank-based measure (RBM) to evaluate DMU from a different standpoint. We suggest a method to obtain a weight which gives the best ranking, and calculates a weight between maximizing the efficiency score and keeping the best ranking. In order to calculate an efficiency score and the best ranking, we repeatedly solve linear programming problems. Moreover, we apply RBM model to the cross efficiency evaluation. Furthermore, a numerical experiment is shown to compare the rankings and scores with traditional evaluations. © 2012 Elsevier Ltd. All rights reserved.

Many researches and standardizations have been done for controlling and managing home networks and appliances during past ten years. Such activities and technologies include the Universal Plug and Play (UPnP)/Digital Living Network Alliance (DLNA), the Energy Conservation and Homecare Network (ECHONET), and the Continua Health Alliance. Such technologies control and manage specific home appliances. However, there have been no technologies and standards for controlling and managing heterogeneous home appliances in a consolidated manner. In addition, there are no standards that fully define technologies for controlling and managing home appliances outside home from mobile phones and cloud servers. In addition to the Internet, new networks such as home networks and sensor networks are emerging. Overlay networking is one of the most suitable technologies for communications among home appliances, home gateways (HGWs), mobile phones, and cloud servers over such heterogeneous networks. Metadata is also an important technology for describing various home appliances in a consistent manner. We have designed overlay networking protocols and metadata for controlling and managing heterogeneous home appliances. Peer-to-Peer Universal Computing Consortium (PUCC) was established to deploy our overlay networking and metadata technologies toward de facto standardization. We explain PUCC overlay networking technologies, and their application to home appliances control from a mobile phone, and describe PUCC activities. © 1963-2012 IEEE.

Ishikawa N.,Komazawa University
Proceedings of the 2015 IEEE International Conference on Networking, Architecture and Storage, NAS 2015 | Year: 2015

The Internet is nowadays divided into multiple segments with different address spaces such as IPv4, IPv6 and private address. To interconnect such segments, NAT, firewall or similar devices are indispensable in the current Internet. Placing such devices on the Internet unnecessarily complicated the Internet. It is extremely difficult and even impossible to strictly preserve the original end-to-end principle of the Internet. We think that it is still possible to preserve the key feature of the end-to-end principle of the Internet even in the current Internet, by just relaxing this strict principle. To this end, we propose a new Internet architecture, which is called a Virtual IP Layer (VIP) that virtually realizes IP connectivity between hosts that belong to different IP address realms. The virtual IP layer is placed just over the IP layer, and performs the IP address translation in a consistent manner, by applying the label-switching technique to forwarding of IP packets. To verify the feasibility of this architecture, we have applied it to communication between hosts, which belong to different private IPv4 realms, via the global IPv4 address realm (i.e. the Internet), and developed its prototype. © 2015 IEEE.

TOKYO, Japan and PALO ALTO, Calif., Nov. 28, 2016 /PRNewswire/ -- Komazawa University and Varian Medical Systems (NYSE: VAR) today announced a new advanced radiotherapy education center in Japan. Located on the Komazawa campus in Tokyo, the education center is equipped with a fully...

Loading Komazawa University collaborators
Loading Komazawa University collaborators