著者

Haruhiko Okumura

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.22, no.4, pp.566-573, 2014 (Released:2014-10-15)

参考文献数

55

被引用文献数

2

---

“3.11”—the worst disaster in postwar Japanese history, consisting of the Great East Japan Earthquake (March 11, 2011), the subsequent tsunami and the nuclear accident at the Fukushima Daiichi power plant—taught us many valuable lessons. This paper reviews the disaster from a computer scientist's perspective, paying special attention to the problem of presenting data to the public, and discusses what we could do and can still do.

著者

Atsushi Hashimoto Nagisa Ishiura

出版者

一般社団法人 情報処理学会

雑誌

IPSJ Transactions on System LSI Design Methodology (ISSN:18826687)

巻号頁・発行日

vol.9, pp.21-29, 2016 (Released:2016-02-12)

参考文献数

17

被引用文献数

10

---

This paper presents new methods of detecting missed arithmetic optimization opportunities for C compilers by random testing. For each iteration of random testing, two equivalent programs are generated, where the arithmetic expressions in the second program are more optimized in the C program level. By comparing the two assembly codes compiled from the two C programs, lack of optimization on either of the programs is detected. This method is further extended for detecting erroneous or insufficient optimization involving volatile variables. Two random programs differing only on the initial values for volatile variables are generated, and the resulting assembly codes are compared. Random test systems implemented based on the proposed methods have detected missed optimization opportunities on several compilers, including the latest development versions of GCC-5.0.0 and LLVM/Clang-3.6.

著者

Masami Hagiya

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.23, no.4, pp.525-530, 2015 (Released:2015-07-15)

参考文献数

16

被引用文献数

11

---

The Science Council of Japan's Committee on Informatics is currently creating a reference standard in informatics. This activity includes defining informatics for university education and for the future academic development of informatics. The most characteristic feature of the chosen definition of informatics is the desire to cover all branches of informatics across bun-kei (social sciences and humanities) and ri-kei (natural science and engineering), with the intention of unifying the field. In the present paper, the background of the activity, and the motivation and implications of the definition of informatics are presented. In particular, we discuss the importance of covering bun-kei and ri-kei for the future development of informatics and the implications of the definition on liberal arts education in universities and primary and secondary education in elementary, middle and high schools.

著者

Yuta Sawabe Daiki Chiba Mitsuaki Akiyama Shigeki Goto

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.27, pp.536-544, 2019 (Released:2019-09-15)

参考文献数

29

被引用文献数

2

---

Currently, many attacks are targeting legitimate domain names. In homograph attacks, attackers exploit human visual misrecognition, thereby leading users to visit different (fake) sites. These attacks involve the generation of new domain names that appear similar to an existing legitimate domain name by replacing several characters in the legitimate name with others that are visually similar. Specifically, internationalized domain names (IDNs), which may contain non-ASCII characters, can be used to generate/register many similar IDNs (homograph IDNs) for their application as phishing sites. A conventional method of detecting such homograph IDNs uses a predefined mapping between ASCII and similar non-ASCII characters. However, this approach has two major limitations: (1) it cannot detect homograph IDNs comprising characters that are not defined in the mapping and (2) the mapping must be manually updated. Herein, we propose a new method for detecting homograph IDNs using optical character recognition (OCR). By focusing on the idea that homograph IDNs are visually similar to legitimate domain names, we leverage OCR techniques to recognize such similarities automatically. Further, we compare our approach with a conventional method in evaluations employing 3.19 million real (registered) and 10, 000 malicious IDNs. Results reveal that our method can automatically detect homograph IDNs that cannot be detected when using the conventional approach.

著者

Yoshihiro Oyama Yudai Kawasaki Kazushi Takahashi

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.23, no.2, pp.132-141, 2015 (Released:2015-03-15)

参考文献数

30

---

Many dynamic malware analysis systems based on hypervisors have been proposed. Although they support malware analysis effectively, many of them have a shortcoming that permits the malware to easily recognize the virtualized hardware and change its execution to prevent analysis. We contend that this drawback can be mitigated using a hypervisor that virtualizes the minimum number of hardware accesses. This paper proposes a hypervisor-based mechanism that can function as a building block for dynamic malware analysis systems. The mechanism provides the facility for checkpointing and restoring a guest OS. It is designed for a parapass-through hypervisor, that is, a hypervisor that runs directly on the hardware and does not execute a host OS or an administrative guest OS. The advantage of using a parapass-through hypervisor is that it provides a virtual machine whose hardware configuration and behavior is similar to the underlying physical machine, and hence, it can be stealthier than other hypervisors. We extend the parapass-through hypervisor BitVisor with the proposed mechanism, and demonstrate that the resulting system can successfully checkpoint and restore the states of Linux and Windows OSes. We confirm that hypervisor detectors running on the system cannot identify the virtualized hardware, and determine that they are executing on a physical machine. We also confirm that the system imposes minimal overhead on the execution times of the benchmark programs.

著者

Yu Suzuki

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.23, no.1, pp.22-30, 2015 (Released:2015-01-15)

参考文献数

30

被引用文献数

1 18

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In this paper, we propose a method for assessing quality values of Wikipedia articles from edit history using h-index. One of the major methods for assessing Wikipedia article quality is a peer-review based method. In this method, we assume that if an editor's texts are left by the other editors, the texts are approved by the editors, then the editor is decided as a good editor. However, if an editor edits multiple articles, and the editor is approved at a small number of articles, the quality value of the editor deeply depends on the quality of the texts. In this paper, we apply h-index, which is a simple but resistant to excessive values, to the peer-review based Wikipedia article assessment method. Although h-index can identify whether an editor is a good quality editor or not, h-index cannot identify whether the editor is a vandal or an inactive editor. To solve this problem, we propose p-ratio for identifying which editors are vandals or inactive editors. From our experiments, we confirmed that by integrating h-index with p-ratio, the accuracy of article quality assessment in our method outperforms the existing peer-review based method.

著者

Masashi Tsubaki Masashi Shimbo Yuji Matsumoto

出版者

一般社団法人 情報処理学会

雑誌

IPSJ Transactions on Bioinformatics (ISSN:18826679)

巻号頁・発行日

vol.10, pp.2-8, 2017 (Released:2017-01-20)

参考文献数

31

被引用文献数

3

---

Predicting the 3D structure of a protein from its amino acid sequence is an important challenge in bioinformatics. Since directly predicting the 3D structure is hard to achieve, classifying a protein into one of the “folds”, which are pre-defined structural labels in protein databases such as SCOP and CATH, is generally used as an intermediate step to determine the 3D structure. This classification task is called protein fold recognition (PFR), and much research has addressed the problem of either (i) feature extractions from amino acid sequences or (ii) classification methods of the protein folds. In this paper, we propose a new approach for PFR with (i) learning feature representations with unsupervised methods from a large protein database instead of manual feature selection and using external tools. (ii) learning deep neural architectures, recurrent neural networks (RNNs) with long short-term memory (LSTM) units, and re-training the representations instead of fixing the extracted features. On a benchmark dataset, our approach outperforms existing methods that use various physicochemical features.

著者

Jin Akiyama Hyunwoo Seong

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.23, no.3, pp.246-251, 2015 (Released:2015-05-15)

参考文献数

8

被引用文献数

1

---

A parallelohedron is a convex polyhedron which fills the space by translations only. There are five families of parallelohedra. A pentadron is a pentahedron whose copies compose at least one member of every family of parallelohedra. A pentadral complex is a convex polyhedron which is constructed by combining copies of pentadra in a face-to-face gluing manner. In this paper, reversibilities and tessellabilities of pentadral complices and their related topics are studied.

著者

Takayoshi Yamashita Takaya Nakamura Hiroshi Fukui Yuji Yamauchi Hironobu Fujiyoshi

出版者

一般社団法人 情報処理学会

雑誌

IPSJ Transactions on Computer Vision and Applications (ISSN:18826695)

巻号頁・発行日

vol.7, pp.99-103, 2015 (Released:2015-07-27)

参考文献数

15

被引用文献数

6

---

Facial part labeling which is parsing semantic components enables high-level facial image analysis, and contributes greatly to face recognition, expression recognition, animation, and synthesis. In this paper, we propose a cost-alleviative learning method that uses a weighted cost function to improve the performance of certain classes during facial part labeling. As the conventional cost function handles the error in all classes equally, the error in a class with a slightly biased prior probability tends not to be propagated. The weighted cost function enables the training coefficient for each class to be adjusted. In addition, the boundaries of each class may be recognized after fewer iterations, which will improve the performance. In facial part labeling, the recognition performance of the eye class can be significantly improved using cost-alleviative learning.

著者

Ayako Ohshiro Hitoshi Afuso Takeo Okazaki Morikazu Nakamura

出版者

一般社団法人 情報処理学会

雑誌

IPSJ Transactions on Bioinformatics (ISSN:18826679)

巻号頁・発行日

vol.10, pp.9-15, 2017 (Released:2017-03-29)

参考文献数

27

---

Various de novo assembly methods based on the concept of k-mer have been proposed. Despite the success of these methods, an alternative approach, referred to as the hybrid approach, has recently been proposed that combines different traditional methods to effectively exploit each of their properties in an integrated manner. However, the results obtained from the traditional methods used in the hybrid approach depend not only on the specific algorithm or heuristics but also on the selection of a user-specific k-mer size. Consequently, the results obtained with the hybrid approach also depend on these factors. Here, we designed a new assembly approach, referred to as the rule-based assembly. This approach follows a similar strategy to the hybrid approach, but employs specific rules learned from certain characteristics of draft contigs to remove any erroneous contigs and then merges them. To construct the most effective rules for this purpose, a learning method based on decision trees, i.e., a complex decision tree, is proposed. Comparative experiments were also conducted to validate the method. The results showed that proposed method could outperformed traditional methods in certain cases.

著者

Katsuhiro Naito

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.25, pp.23-31, 2017 (Released:2017-01-15)

参考文献数

83

被引用文献数

15

---

Technological development in communications and electronics has made the growing expansion of the Internet of Things (IoT). IoT is expected to make a great impact to our society because smart devices in IoT are easily integrated into existing service. As a result, standardization of technologies to support the IoT is becoming more important to realize a smart society through different service domains. This paper presents a survey on the current state of the art of standards for IoT technologies and gives a brief introduction to related standards and recent research areas in IoT. Finally, it also proposes an idea of the future platform of scalable IoT systems. The proposed idea employs IP mobility technologies to realize inter-operability among IoT devices in different networks.

著者

Wei Wei Akihiro Nakamata Yoshihiro Kawahara Tohru Asami

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.23, no.6, pp.835-844, 2015 (Released:2015-11-15)

参考文献数

17

被引用文献数

4

---

In this paper, we demonstrate a food recognition method by monitoring power leakage from a domestic microwave oven. Universal Software Radio Peripheral (USRP) is applied as a low-cost spectrum analyzer to measure the microwave oven leakage as received signal strength indication (RSSI). We aim to recognize 18 categories of food that are commonly cooked in a microwave oven. By analyzing 180 features that contain the information of heating-time difference, we attain an average recognition accuracy of 82.3%. Using 138 features excluding the heating-time difference information, the average recognition accuracy is 56.2%. The recognition accuracy under different conditions is also investigated, for instance, utilizing different microwave ovens, different distances between the microwave oven and the USRP as well as different data down-sampling rates. Finally, a food recognition application is implemented to demonstrate our method.

著者

Yuki Endo Fubito Toyama Chikafumi Chiba Hiroshi Mori Kenji Shoji

出版者

一般社団法人 情報処理学会

雑誌

IPSJ Transactions on Bioinformatics (ISSN:18826679)

巻号頁・発行日

vol.8, pp.2-8, 2015 (Released:2015-01-27)

参考文献数

14

---

Sequencing the whole genome of various species has many applications, not only in understanding biological systems, but also in medicine, pharmacy, and agriculture. In recent years, the emergence of high-throughput next generation sequencing technologies has dramatically reduced the time and costs for whole genome sequencing. These new technologies provide ultrahigh throughput with a lower per-unit data cost. However, the data are generated from very short fragments of DNA. Thus, it is very important to develop algorithms for merging these fragments. One method of merging these fragments without using a reference dataset is called de novo assembly. Many algorithms for de novo assembly have been proposed in recent years. Velvet and SOAPdenovo2 are well-known assembly algorithms, which have good performance in terms of memory and time consumption. However, memory consumption increases dramatically when the size of input fragments is larger. Therefore, it is necessary to develop an alternative algorithm with low memory usage. In this paper, we propose an algorithm for de novo assembly with lower memory. In our experiments using E.coli K-12 strain MG 1655 and human chromosome 14, the memory consumption of our proposed algorithm was less than that of other popular assemblers.

著者

Hideo Taniguchi

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.22, no.2, pp.96-96, 2014 (Released:2014-04-15)

著者

Ryosuke Matsumoto Kenji Rikitake Kentaro Kuribayashi

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.27, pp.650-657, 2019 (Released:2019-09-15)

参考文献数

28

---

For large-scale certificate management of multi-tenant web servers, preloading numerous certificates for managing numerous hosts under the single server process results in increasing the required memory usage because of the respective page table entry manipulation, which might be a poor resource efficiency and a reduced capacity. To resolve this issue, we propose a method for dynamic loading of certificates bound to the hostnames found during the SSL/TLS handshake sequences without preloading, provided that the Server Name Indication (SNI) extension is available. We implemented the function of choosing the respective certificates with the ngx_mruby module, which extends web server functions using mruby with a small memory footprint while maintaining the execution speed. The proposed method was evaluated by a web hosting service employing the authors.

著者

Valentina Dagiene Gabriele Stupuriene

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.24, no.4, pp.732-739, 2016 (Released:2016-07-15)

参考文献数

28

被引用文献数

17

---

Informatics or Computer Science is important subject in nowadays school education. Informatics can be presented as a discipline for understanding technology in a deeper way - the understanding behind computer programs. Bringing Informatics to schools means preparing young people to be creators of information technology - not only to be users of technological devices. To achieve that, we need to introduce Informatics concepts to primary, basic (K-9) and secondary education (K-12). From the other side, we need to help people to solve problems by using technology and developing computational thinking in various areas. The paper presents a short overview of Informatics education at schools of Lithuania with focus on future modern Informatics and Information Technology curriculum for K-12 education. The importance of informal education of Informatics concepts and computational thinking through contests is discussed as well. Few examples of short tasks for understanding Informatics concepts and developing computational thinking skills are presented.

著者

Yoji Yamato Yoshifumi Fukumoto Hiroki Kumazaki

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.25, pp.317-320, 2017 (Released:2017-04-15)

参考文献数

28

被引用文献数

18

---

Recently, progress has been made in IoT technologies and applications in the maintenance area are expected. However, IoT maintenance applications are not widespread in Japan yet because of the one-off solution of sensing and analyzing for each case, the high cost collecting sensing data and insufficient maintenance automation. This paper proposes a maintenance platform which analyzes sound data in edges, analyzes only anomaly data in cloud and orders maintenance automatically.

著者

Yin Minn Pa Pa Shogo Suzuki Katsunari Yoshioka Tsutomu Matsumoto Takahiro Kasama Christian Rossow

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.24, no.3, pp.522-533, 2016 (Released:2016-05-15)

参考文献数

32

被引用文献数

1 123

---

We analyze the increasing threats against IoT devices. We show that Telnet-based attacks that target IoT devices have rocketed since 2014. Based on this observation, we propose an IoT honeypot and sandbox, which attracts and analyzes Telnet-based attacks against various IoT devices running on different CPU architectures such as ARM, MIPS, and PPC. By analyzing the observation results of our honeypot and captured malware samples, we show that there are currently at least 5 distinct DDoS malware families targeting Telnet-enabled IoT devices and one of the families has quickly evolved to target more devices with as many as 9 different CPU architectures.

著者

Ryohei Banno Susumu Takeuchi Michiharu Takemoto Tetsuo Kawano Takashi Kambayashi Masato Matsuo

出版者

一般社団法人 情報処理学会

雑誌

Journal of Information Processing (ISSN:18826652)

巻号頁・発行日

vol.23, no.2, pp.105-116, 2015 (Released:2015-03-15)

参考文献数

22

被引用文献数

2 19

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To provide event-driven services in IoT, scalable methods of topic-based pub/sub messaging are indispensable. Methods using structured overlay networks are promising candidates. However, existing methods have the problem of wasting network resources, because they lack adaptivity to “exhaust data, ” which have low or no value most of the time. The problem contains two aspects. One is that each publisher node continues to forward data to a relay node even if there are no subscribers. The other is that excessively large multicast trees are constructed for low value data, which will be received by only a small number of subscribers. In this paper, we formulate the desirable design of overlay networks by defining a property called “strong relay-free” as an expansion of relay-free property. The property involves publishers and subscribers composing connected subgraphs to enable detecting the absence of subscribers and autonomously adjusting the tree size. We also propose a practical method satisfying the property by using Skip Graph, and evaluate it through simulation experiments. We confirmed that the proposed method can suspend publishing adaptively, and shorten the path length on multicast trees by more than 75% under an experimental condition with 100,000 nodes.

著者

Hideaki Umeyama Mitsuo Iwadate Y-h. Taguchi

出版者

一般社団法人 情報処理学会

雑誌

IPSJ Transactions on Bioinformatics (ISSN:18826679)

巻号頁・発行日

vol.8, pp.14-20, 2015 (Released:2015-08-19)

参考文献数

31

---

Background: Spleen tyrosine kinase (SYK) is a protein related to various diseases. Aberrant SYK expression often causes the progression and initiation of several diseases including cancer and autoimmune diseases. Despite the importance of inhibiting SYK and identifying candidate inhibitors, no clinically effective inhibitors have been reported to date. Therefore, there is a need for novel SYK inhibitors. Results: Candidate compounds were investigated using in silico screening by chooseLD, which simulates ligand docking to proteins. Using this system, known inhibitors were correctly recognized as compounds with high affinity to SYK. Furthermore, many compounds in the DrugBank database were newly identified as having high affinity to the ATP-binding sites in the kinase domain with a similar affinity to previously reported inhibitors. Conclusions: Many drug candidate compounds from the DrugBank database were newly identified as inhibitors of SYK. Because compounds registered in the DrugBank are expected to have fewer side effects than currently available compounds, these newly identified compounds may be clinically useful inhibitors of SYK for the treatment of various diseases.