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Institution

NEC

CompanyTokyo, Japan
About: NEC is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 33269 authors who have published 57670 publications receiving 835952 citations. The organization is also known as: NEC Corporation & NEC Electronics Corporation.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate quantum process tomography of controlled-Z and controlled-NOT gates using capacitively coupled superconducting phase qubits and obtain a process fidelity of 0.70 for the controlled phase and 0.56 for controlled-not gate, with the loss of fidelity mostly due to single-qubit decoherence.
Abstract: We experimentally demonstrate quantum process tomography of controlled-Z and controlled-NOT gates using capacitively coupled superconducting phase qubits. These gates are realized by using the $|2⟩$ state of the phase qubit. We obtain a process fidelity of 0.70 for the controlled phase and 0.56 for the controlled-NOT gate, with the loss of fidelity mostly due to single-qubit decoherence. The controlled-Z gate is also used to demonstrate a two-qubit Deutsch-Jozsa algorithm with a single function query.

122 citations

Proceedings ArticleDOI
01 Jan 2018
TL;DR: PRIOTRACKER is a backward and forward causality tracker that automatically prioritizes the investigation of abnormal causal dependencies in the tracking process and can capture attack traces that are missed by existing trackers and reduce the analysis time by up to two orders of magnitude.
Abstract: The increasingly sophisticated Advanced Persistent Threat (APT) attacks have become a serious challenge for enterprise IT security. Attack causality analysis, which tracks multi-hop causal relationships between files and processes to diagnose attack provenances and consequences, is the first step towards understanding APT attacks and taking appropriate responses. Since attack causality analysis is a time-critical mission, it is essential to design causality tracking systems that extract useful attack information in a timely manner. However, prior work is limited in serving this need. Existing approaches have largely focused on pruning causal dependencies totally irrelevant to the attack, but fail to differentiate and prioritize abnormal events from numerous relevant, yet benign and complicated system operations, resulting in long investigation time and slow responses. To address this problem, we propose PRIOTRACKER, a backward and forward causality tracker that automatically prioritizes the investigation of abnormal causal dependencies in the tracking process. Specifically, to assess the priority of a system event, we consider its rareness and topological features in the causality graph. To distinguish unusual operations from normal system events, we quantify the rareness of each event by developing a reference model which records common routine activities in corporate computer systems. We implement PRIOTRACKER, in 20K lines of Java code, and a reference model builder in 10K lines of Java code. We evaluate our tool by deploying both systems in a real enterprise IT environment, where we collect 1TB of 2.5 billion OS events from 150 machines in one week. Experimental results show that PRIOTRACKER can capture attack traces that are missed by existing trackers and reduce the analysis time by up to two orders of magnitude.

122 citations

Journal ArticleDOI
TL;DR: The spontaneous Raman scattering from hybridized light–matter states was studied, showing that the collective Rabi splitting occurs at the level of a single selected bond, revealing a new enhancement mechanism as a result of vibrational strong coupling.
Abstract: Ground-state molecular vibrations can be hybridized through strong coupling with the vacuum field of a cavity optical mode in the infrared region, leading to the formation of two new coherent vibro-polariton states. The spontaneous Raman scattering from such hybridized light–matter states was studied, showing that the collective Rabi splitting occurs at the level of a single selected bond. Moreover, the coherent nature of the vibro-polariton states boosts the Raman scattering cross-section by two to three orders of magnitude, revealing a new enhancement mechanism as a result of vibrational strong coupling. This observation has fundamental consequences for the understanding of light-molecule strong coupling and for molecular science.

122 citations

Patent
Kou Yukari1
15 Jul 1992
TL;DR: In this article, each user station transmits a packet to the central station on a randomly selected timeslot of a time-division multiple access channel and defines a plurality of "minislots" within the selected time slot and transmits on one of the minislots.
Abstract: In a random access communication system comprising a central station and user stations, each user station transmits a packet to the central station on a randomly selected timeslot of a time-division multiple access channel and defines a plurality of "minislots" within the selected timeslot and transmits a burst on one of the minislots. The central station monitors the defined monislots to detect the burst transmission, and assigns as many timeslots as required if more than one burst transmission is detected within a timeslot interval. A slot assignment signal is sent from the central station to the user stations containing a negative acknowledgment of the transmitted packet. The user station from which the packet was transmitted is responsive to the negative acknowledgment to select one of the assigned timeslots and retransmit to the central station a copy of the packet on the selected assigned timeslot.

122 citations

Journal ArticleDOI
14 Oct 2003
TL;DR: A novel human-machine interface, called "FAce MOUSe", for controlling the position of a laparoscope, which tracks the surgeon's facial motions robustly in real time and does not require the use of any body-contact devices, such as head-mounted sensing devices.
Abstract: Robotic laparoscope positioners are now expected as assisting devices for solo surgery among endoscopic surgeons. In such robotic systems, the human-machine (surgeon-robot) interface is of paramount importance because it is the means by which the surgeon communicates with and controls the robotic camera assistant. We have designed a novel human-machine interface, called "FAce MOUSe", for controlling the position of a laparoscope. The proposed human interface is an image-based system which tracks the surgeon's facial motions robustly in real time and does not require the use of any body-contact devices, such as head-mounted sensing devices. The surgeon can easily and precisely control the motion of the laparoscope by simply making the appropriate face gesture, without hand or foot switches or voice input. Based on the FAce MOUSe interface, we have developed a new robotic laparoscope positioning system for solo surgery. Our system allows nonintrusive, nonverbal, hands off and feet off laparoscope operations, which seem more convenient for the surgeon. To evaluate the performance of the proposed system and its applicability in clinical use, we set up an in vivo experiment, in which the surgeon used the system to perform a laparoscopic cholecystectomy on a pig.

122 citations


Authors

Showing all 33297 results

NameH-indexPapersCitations
Pulickel M. Ajayan1761223136241
Xiaodong Wang1351573117552
S. Shankar Sastry12285886155
Sumio Iijima106633101834
Thomas W. Ebbesen9930570789
Kishor S. Trivedi9569836816
Sharad Malik9561537258
Shigeo Ohno9130328104
Adrian Perrig8937453367
Jan M. Rabaey8152536523
C. Lee Giles8053625636
Edward A. Lee7846234620
Otto Zhou7432218968
Katsumi Kaneko7458128619
Guido Groeseneken73107426977
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20238
202220
2021234
2020518
2019952
20181,088