Jun-ichi Takada

article

New application of dynamic magnetic resonance imaging for the assessment of deglutitive tongue movement

Issareeya Ekprachayakoon, Jun J. Miyamoto, Maristela Sayuri Inoue-Arai, Ei-ichi Honda, more

Progress in Orthodontics > 2018 > 19 > 1 > 1-10

Background Deglutitive motion of the tongue may function to maintain tooth position. However, the causation between abnormal patterns of orofacial muscle function and dental malocclusion remains unclear. To clarify the pathogenic mechanism of malocclusion, it is important to determine the relative positional relationship between the tongue tip and incisor edge or the dorsal tongue and palate during...

article

Examination of craniofacial morphology in Japanese patients with congenitally missing teeth: a cross-sectional study

Yuki Takahashi, Norihisa Higashihori, Yuko Yasuda, Jun-ichi Takada, more

Progress in Orthodontics > 2018 > 19 > 1 > 1-8

Background The purpose of this cross-sectional study was to investigate the effects of congenitally missing teeth on craniofacial morphology and to characterize the features of maxillofacial morphology of oligodontia patients associated with individual skeletal maturity by assessment with the cervical vertebrae maturation (CVM) method. Methods A total of 106 non-syndromic Japanese patients with...

article

Frequency of missing teeth and reduction of mesiodistal tooth width in Japanese patients with tooth agenesis

Norihisa Higashihori, Jun-ichi Takada, Minami Katayanagi, Yuki Takahashi, more

Progress in Orthodontics > 2018 > 19 > 1 > 1-7

Background Tooth agenesis can involve one or more congenitally missing teeth (CMT) and is the most common congenital dental anomalies in humans. Tooth agenesis and reduction of mesiodistal tooth width are reportedly associated, suggesting that the pathogenesis of the two conditions is related. The current study analyzed the frequency of tooth agenesis and mesiodistal tooth width in cases of hypodontia...

article

Multipath Clustering and Cluster Tracking for Geometry-Based Stochastic Channel Modeling

Panawit Hanpinitsak, Kentaro Saito, Jun-ichi Takada, Minseok Kim, more

IEEE Transactions on Antennas and Propagation > 2017 > 65 > 11 > 6015 - 6028

This paper presents a clustering and tracking method that exploits the geometry of the scattering points (SPs) obtained from the measurement-based ray tracer. The multipath components (MPCs) were categorized into clusters by applying the KPowerMeans (KPM) framework to those SPs. The clusters were tracked by comparing the cluster-centroid SPs of the adjacent snapshots. The clusters were estimated based...

chapter

Portable wide-band channel sounder based software defined radio for studying the radio propagation in an outdoor environment

Tossaporn Srisooksai, Jun-ichi Takada, Kentaro Saito

2017 International Symposium on Antennas and Propagation (ISAP) > 1 - 2

2017 International Symposium on Antennas and Propagation (ISAP)

Recently, applying the multimedia wireless sensor networks and computer vision techniques in the outdoor agriculture field can be observed. Since the performance of such techniques is limited by the low data rate of the wireless sensor network, the transmission using the wider bandwidth is one of the possible solutions. This paper proposes the technique to develop the wide-band channel sounder for...

article

Dense Multipath Component Characteristics in 11-GHz-Band Indoor Environments

Kentaro Saito, Jun-Ichi Takada, Minseok Kim

IEEE Transactions on Antennas and Propagation > 2017 > 65 > 9 > 4780 - 4789

In the next-generation mobile communication system, the higher frequency bands from C-band to V-band are expected to be utilized because it has the potential to improve network capacity drastically by the available wideband spectrum. Since the characteristics of reflected and scattered radio waves from surrounding environments in those bands are thought to be quite different than at lower frequencies,...

article

A Novel Phase-Difference Fingerprinting Technique for Localization of Unknown Emitters

Azril Haniz, Gia Khanh Tran, Kentaro Saito, Kei Sakaguchi, more

IEEE Transactions on Vehicular Technology > 2017 > 66 > 9 > 8445 - 8457

Localization of unknown emitters is crucial to tackle illegal radios or radio jammers which may cause harmful interference to other communication systems and disrupt services. Conventional fingerprint-based localization techniques that utilize received signal strength or channel information as location fingerprints may face problems when dealing with emitters whose parameters, such as center frequency,...

article

Coexistence of DTV and TV white space systems

Yee‐Loo Foo, Jun‐ichi Takada

International Journal of Communication Systems > 30 > 9 > n/a - n/a

It is foreseeable that in near future, heterogeneous TV white space (TVWS) systems will operate in underused TV bands. Potential interference between TVWS systems and digital TV (DTV) broadcast system is a major concern. These TVWS systems need to maintain from the DTV service boundary some keep‐out distances d_k, which vary depending on circumstances. This work provides a comprehensive analysis on...

chapter

Spatial fading emulator — Early OTA device in Japan

Jun-ichi Takada, Koichi Ogawa, Kei Sakaguchi

2017 11th European Conference on Antennas and Propagation (EUCAP) > 3673 - 3675

2017 11th European Conference on Antennas and Propagation (EUCAP)

The authors have investigated on the spatial fading emulator comprised of multiple antenna elements emulating the spatially distributed scatterers to generate the fading in the reproducible manner since 2001. This paper presents the history of early development until 2010 when MIMO OTA test was a very popular topic. The motivation, ideas and achievement are reviewed and summarized, because some important...

chapter

11 GHz band MIMO channel characteristics in a street micro-cell environment

Kentaro Saito, Jun-ichi Takada, Minseok Kim

2017 11th European Conference on Antennas and Propagation (EUCAP) > 703 - 706

2017 11th European Conference on Antennas and Propagation (EUCAP)

Recently, the fifth-generation mobile communication system (5G) has been widely investigated to accommodate increasing mobile users' traffic. In the 5G system, although the utilization of the higher frequency band above the 6 GHz band is expected, the detailed investigation for the applicability to the mobile communication is still necessary because of different radio channel characteristics compared...

chapter

Indoor channel characteristics in atrium entrance hall environment at millimeter-wave band

Minseok Kim, Tatsuki Iwata, Kento Umeki, Jun-ichi Takada, more

2017 11th European Conference on Antennas and Propagation (EUCAP) > 707 - 710

2017 11th European Conference on Antennas and Propagation (EUCAP)

In order to utilize higher frequency bands above 6 GHz which is an important technical challenge in fifth generation mobile systems and ultra-high speed WLANs, radio propagation channel properties in large variety of deployment scenarios should be thoroughly investigated. This paper presented measurement results in an atrium entrance hall environment at an millimeter-wave band of 58.5 GHz assuming...

article

Antenna Deembedding in WBAN Channel Modeling Using Spherical Wave Functions

Jun-ichi Naganawa, Jun-ichi Takada, Takahiro Aoyagi, Minseok Kim

IEEE Transactions on Antennas and Propagation > 2017 > 65 > 3 > 1289 - 1300

Body area network (BAN) is a fundamental technology to realize future ICT-based healthcare services and applications, where channel modeling plays an important role in designing more reliable BAN systems. The greatest challenge of the WBAN channel modeling is that the antennas operate in proximity to the human body. Near-field interactions between the antenna and the human body make it difficult to...

chapter

A single-layered circularly-polarized radial line slot antenna

Jun-ichi Takada, Masaharu Takahashi, Tamotsu Ikeda, Makoto Natori, more

1990 Symposium on Antenna Technology and Applied Electromagnetics > 88 - 93

1990 Symposium on Antenna Technology and Applied Electromagnetics

A radial line slot antenna (RLSA) is a kind of slotted waveguide array for DBS reception [1][2]. It is free of conductor loss and the aperture efficiency is more than 75%, twice as high as conventional planar antennas [3]. Those performances have been realized for double-layered RLSAs with uniform slot length.

article

Association between 3-dimensional mandibular morphology and condylar movement in subjects with mandibular asymmetry

Michiyo Ikeda, Jun J. Miyamoto, Jun-ichi Takada, Keiji Moriyama

American Journal of Orthodontics & Dentofacial Orthopedics > 2017 > 151 > 2 > 324-334

The purpose of this study was to evaluate the hypothesis that 3-dimensional mandibular morphology is correlated with condylar movement in patients with mandibular asymmetry.Subjects were classified into 2 groups (n = 25 each): mandibular asymmetry with a menton deviation greater than 4 mm and no mandibular asymmetry with a menton deviation less than 4 mm. Linear and volumetric measurements of 3-dimensional...

chapter

Mm-wave outdoor-to-indoor channel measurement in an open square smallcell scenario

Minseok Kim, Tatsuki Iwata, Kento Umeki, Karma Wangchuk, more

2016 International Symposium on Antennas and Propagation (ISAP) > 614 - 615

2016 International Symposium on Antennas and Propagation (ISAP)

This paper presented an outdoor-to-indoor (O2I) channel measurement result at 58.5 GHz assuming an outdoor hotspot access scenario in 5G mobile systems and WLANs. Comparing the measurement results with ray-tracing (RT) simulation, dominant propagation mechanisms were identified. From the analysis, the propagation mechanism of eight multi-path clusters were identified.

article

Microwave Breast Phantom Measurement System With Compact Side Slotted Directional Antenna

Mohammad Tariqul Islam, Md. Zulfiker Mahmud, Norbahiah Misran, Jun-Ichi Takada, more

IEEE Access > 2017 > 5 > 5321 - 5330

In this paper, a new, complete, and comprehensive breast phantom measurement system is presented. A side slotted vivaldi antenna is used for breast phantom measurement. The radiating fins are modified by etching six side slots to enhance the electrical length and produce stronger directive radiation with higher gain. This approach reduces the lower operating frequency and increases the gain and efficiency...

chapter

Development of mobile learning application to promote world heritage site preservation awareness: Case of Luang Prabang, Lao PDR

Yew Siang Poong, Shinobu Yamaguchi, Jun-ichi Takada

2016 IEEE Global Humanitarian Technology Conference (GHTC) > 78 - 84

2016 IEEE Global Humanitarian Technology Conference (GHTC)

A world cultural heritage site is the legacy passed down by ancestors to all humanity of the world. It represents the masterpiece of the past with cultural significance. Given the increasing pressure between development and preservation, this paper proposes the development of mobile learning application to promote world heritage site preservation awareness in Luang Prabang, Lao PDR. The application...

chapter

Power delay profile measurement for VHF-band broadband mobile communication system

Hiroki Ohara, Hirokazu Sawada, Masayuki Oodo, Hideki Kobayashi, more

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) > 1 - 6

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

This paper presents measurement and analysis results of power delay profiles and fading characteristics for “Public Broadband Wireless Communication (PBB) System” in VHF band. The PBB system was proposed to utilize a portion of vacant spectrum in VHF band due to the frequency reallocation plan in Japan, and the system was standardized as ARIB STD-T103 as well as IEEE802.16n. The purpose of this study...

chapter

Dense multipath component parameter estimation in 11GHz-band indoor environment

Kentaro Saito, Jun-ichi Takada, Minseok Kim

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) > 1 - 6

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

In next-generation mobile communication systems, utilization of higher frequency bands above 10 GHz has become a hot research topic because it has the potential to improve network capacity drastically by utilizing the available wideband spectrum. However in the higher frequency bands, in addition to the higher propagation loss, diffuse scattering of propagation wave is thought to affect the multiple-input...

chapter

Polarimetric millimeter wave propagation channel measurement and cluster properties in outdoor urban pico-cell environment

Karma Wangchuk, Kento Umeki, Tatsuki Iwata, Minseok Kim, more

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) > 1 - 6

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

To use millimeter wave bands in future cellular and wireless networks, characterization of the radio propagation channel in outdoor urban small cell or pico cell environment is vital. In this paper we present results from analysis of wideband full polarimetric directional channel measurements in an urban pico-cell environment using the double directional millimeter wave channel sounding system we...

INFONA - science communication portal

Search results for: Jun-ichi Takada

New application of dynamic magnetic resonance imaging for the assessment of deglutitive tongue movement

Examination of craniofacial morphology in Japanese patients with congenitally missing teeth: a cross-sectional study

Frequency of missing teeth and reduction of mesiodistal tooth width in Japanese patients with tooth agenesis

Multipath Clustering and Cluster Tracking for Geometry-Based Stochastic Channel Modeling

Portable wide-band channel sounder based software defined radio for studying the radio propagation in an outdoor environment

Dense Multipath Component Characteristics in 11-GHz-Band Indoor Environments

A Novel Phase-Difference Fingerprinting Technique for Localization of Unknown Emitters

Coexistence of DTV and TV white space systems

Spatial fading emulator — Early OTA device in Japan

11 GHz band MIMO channel characteristics in a street micro-cell environment

Indoor channel characteristics in atrium entrance hall environment at millimeter-wave band

Antenna Deembedding in WBAN Channel Modeling Using Spherical Wave Functions

A single-layered circularly-polarized radial line slot antenna

Association between 3-dimensional mandibular morphology and condylar movement in subjects with mandibular asymmetry

Mm-wave outdoor-to-indoor channel measurement in an open square smallcell scenario

Microwave Breast Phantom Measurement System With Compact Side Slotted Directional Antenna

Development of mobile learning application to promote world heritage site preservation awareness: Case of Luang Prabang, Lao PDR

Power delay profile measurement for VHF-band broadband mobile communication system

Dense multipath component parameter estimation in 11GHz-band indoor environment

Polarimetric millimeter wave propagation channel measurement and cluster properties in outdoor urban pico-cell environment

Filter options

Publication date

Content availability

Publication type

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Jun-ichi Takada

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Publication type

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options