In the present study, we propose a novel case-based similar image retrieval (SIR) method for hematoxylin and eosin (H&E) stained histopathological images of malignant lymphoma. When a whole slide image (WSI) is used as an input query, it is desirable to be able to retrieve similar cases by focusing on image patches in pathologically important regions such as tumor cells. To address this problem, we employ attention-based multiple instance learning, which enables us to focus on tumor-specific regions when the similarity between cases is computed. Moreover, we employ contrastive distance metric learning to incorporate immunohistochemical (IHC) staining patterns as useful supervised information for defining appropriate similarity between heterogeneous malignant lymphoma cases. In the experiment with 249 malignant lymphoma patients, we confirmed that the proposed method exhibited higher evaluation measures than the baseline case-based SIR methods. Furthermore, the subjective evaluation by pathologists revealed that our similarity measure using IHC staining patterns is appropriate for representing the similarity of H&E stained tissue images for malignant lymphoma.

Millimeter wave wireless systems rely heavily on directional communication in narrow steerable beams. Tools to measure the spatial and temporal nature of the channel are necessary to evaluate beamforming and related algorithms. This paper presents a novel 60 GHz phased-array based directional channel sounder and data analysis procedure that can accurately extract paths and their transmit and receive directions. The gains along each path can also be measured for analyzing blocking scenarios. The sounder is validated in an indoor office environment.

Channel measurements at millimeter wave (mmWave) frequencies are typically carried out using directional antennas to overcome high path loss at mmWave frequencies. Unlike traditional directional channel measurements using narrow beam horn antennas where ray paths can be uniquely mapped to a direction with sufficient high accuracy, phased arrays with irregular beam pattern offers additional complexity in determining the arrival statistics of ray paths. In this work, we propose a systematic method to infer the ray path characteristics with the knowledge of beam patterns used by the phased array. We leverage on the channel measurement data obtained from extensive 60 GHz measurement campaign performed for indoor living room scenario and extract the ray path information from the measured data with high reliability. We also verify our findings through ray tracing simulation.

Packet classification is used to determine the behavior of packets incoming to network devices. Since it is achieved using linear search on a classification rule list, a large number of rules leads to longer communication latency. To decrease this latency, the problem is generalized as optimal rule ordering (ORO), which aims to identify the order of rules that minimizes the classification latency caused by packet classification while preserving the classification policy. Since ORO is known to be NP-complete, various heuristics for ORO have been proposed. Sub-graph merging (SGM) is the state-of-the-art heuristic algorithm for ORO. However, the SGM algorithm does not terminate in most cases because of inappropriate updates of the array that stores the number of reachable rules. Moreover, since SGM uses the adjacent matrix to maintain the preceding relation on the rules, a considerable amount of time is consumed when the preceding relation is complex. In this paper, we propose a correction for SGM that can terminate for any instance. The proposed algorithm decreases reordering time by about 99\% compared to SGM. Furthermore, we propose a reordering algorithm that selects sub-graphs more comprehensively than SGM. Doing so decreases the latency in comparison with SGM. We show the efficiency of the algorithms through experiments.

In recent years our lives have become more convenient with the abundant information being provided by our information society. We utilize that abundant information in living more effectively. A similar thing could be said about sightseeing. For example, tourist navigation systems have many features that allow the most suitable route to a destination to be displayed, similar to car navigation systems. However, there is a need to incorporate accidental encounters so that walking type sightseeing can be reviewed. This study does not support effective sightseeing but instead supports sightseeing that can be leisurely enjoyed. This study emphasizes “a sense of fun” and suggests a tourist navigation system that intentionally limits route information and induces accidental encounters. Or more concretely a navigation system was experimentally created in which the map around you disappears with movement. The effectiveness of it was then tested in assessment experiments utilizing a subject.

MC DS-CDMA is a combination of OFDM and time-domain spreading, while MC-CDMA is a combination of OFDM and frequency-domain spreading. In MC-CDMA, a good bit error rate (BER) performance can be achieved by using frequency-domain equalization (FDE), since the frequency diversity gain is obtained. On the other hand, the conventional MC DS-CDMA cannot obtain the frequency diversity gain. In this paper, the authors propose MC DS-CDMA that can obtain the frequency diversity gain by applying FDE. The conditional BER analysis is presented. The theoretical average BER performance in a frequency-selective Rayleigh fading channel is evaluated by Monte-Carlo numerical computation method using the derived conditional BER and is confirmed by computer simulation of the MC DS-CDMA signal transmission.

No abstract available.

Abstract In this paper we describe a method for modeling and rendering dynamic behavior of fluids withsplashes and foam. A particle system is built into a fluid simulation system to represent an ocean wavecresting and spraying over another object. We use the Cubic Interpolated Propagation (CIP) method asthe fluid solver. The CIP method can solve liquid and gas together in the framework of fluid dynamicsand has high accuracy in the case of relatively coarse grids. This enables us to simulate the fluids in ashort time and describe the motion of splashes in the air that is associated with the liquid motion well.The foam floating on the water also can be described using the particle system. We integrate the rigidbody simulation with the fluid and particle system to create sophisticated scenes including splashes andfoam. We construct state change rules that are used with the particle system. This controls the generation,vanishing and transition rule of splashes and foam. The transition rule makes the seamless connection betweena splash and foam. We employed a fast volume rendering method with scattering effect for particles.One of the important features of our method is the combination of fast simulation and rendering techniques,which provides dynamic and realistic scenes in a short time.