All issues
Predecessor
26.20
Displaying 1-13 of 13 articles from this issue
- |<
- <
- 1
- >
- >|
-
Article type: Cover
Pages Cover1-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (47K) -
Makoto Sato, Masakatsu Tanaka, Yukio Katayanagi, Masayuki Ishida, Naok ...Article type: Article
Session ID: ROFT2002-27
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe transition from analog to digital broadcasting will be performed in a stepwise manner, and there will be a simulcast period until that migration is complete. This will result in more transmitter sites and even more complicated frequency planning. There is a high probability that interference and other disturbances will occur. The system that we have developed can automatically detect the state of reception for each channel or the mutual state of reception between channels. The system is an important measurement equipment for the DTTB.View full abstractDownload PDF (1859K) -
Yoshikazu TOBA, Shigenori TORIHATA, Yasuhiro TAKEUCHI, Kazuhisa HAEIWA ...Article type: Article
Session ID: ROFT2002-28
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe developed high sensitive radio wave transmitting svstem using an optical modulator for Digital terrestrial TV broadcasting. The features of this newly developed system, does not require electrical power line at the receiving point and has merits of multi-carrier(OFDM signal) waves long distance transmission. Therefore, transmitting and receiving point are easily separated so that the system can be effectively used to construct SFN. In this paper, we mainly discuss the improvement of sensitivity of this radio wave transmitting system.View full abstractDownload PDF (581K) -
Katsuyuki FUJII, Koichi ITO, Shigeru TAJIMAArticle type: Article
Session ID: ROFT2002-29
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSNear future, a further direction of mobile and ubiquitous communications will be integrated each other. As one of these forms, a wearable transmitter and a ubiquitous receiver with electrodes were developed. The signal is transmitted from the transmitter to the receiver through human body when a user wearing the transmitter touches the receiver. However, little is known about the transmission mechanisms of human body as the transmission channel. Therefore, in this paper, human body wearing the transmitter is modeled by the FDTD method and variations of transmission power caused by the differences of the electrode structure are analyzed.View full abstractDownload PDF (964K) -
Naoki Yoshida, Yusuke Ukawa, Hiroyasu Matsui, Toshio WakabayashiArticle type: Article
Session ID: ROFT2002-30
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRecently, Mobile communication is used in various frequency bands. We have designed an antenna with a conductor frame which has several resonant frequencies. In this paper, an objective is to obtain optimum parameters without degradation of characteristics in return loss at the first resonant frequency. By using FDTD method, characteristics of return loss and far-field patterns are shown in figures.View full abstractDownload PDF (529K) -
Daisuke DOBASHI, Jun-ichi TAKADAArticle type: Article
Session ID: ROFT2002-31
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDSRC(Dedicated Short Range Communication) is one of the ITS (Intelligent Transport System) standards that is being researched in order to make highway traffic safer and more comfortable for its users. In DSRC environments, the base stations located along the highways must have a very short range of operation(about 30 meters) in order to provide efficient frequency reuse. In tunnels, however, the walls produce many reflections, which externd the range of the base-stations and may cause interference among co-channel zones. In the present research, the zone structure of a DSRC environment in a rectangular tunnel is simulated and investigated.View full abstractDownload PDF (536K) -
Masaki TANAKA, Hiroyuki YOSHIMURA, Koichi ITOArticle type: Article
Session ID: ROFT2002-32
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn broadcasting satellite systems, the reduction of the weight and volume and the rain-fall attenuation compensation system are demanded. The optically controlled array antenna based on an optical Fourier transform and an optical / electrical conversion has a possibility of satisfying these demands. In this paper, we make clear how to design the optically controlled array antenna radiating the beam covering the Japanese Island. Moreover we consider the reduction of the number of elements to simplify system. The validity of this system for rain-fall attenuation compensation is also shown.View full abstractDownload PDF (652K) -
Atsushi Ozawa, Toshihiro Tsuneo, Ryo Tomitani, Satoshi Kakinuma, Osamu ...Article type: Article
Session ID: ROFT2002-33
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA new Optical Microphone using Fiber Bragg Grating was developed and its characteristics were experimentally studied. The vibration signal of the paper is transformed to the change of FBG length and the change of the optical reflected power is obtained. Frequency and directional responses were measured using an audio speaker as a sound source. This optical microphone is useful for suppression of electric noise and expected to find a new application field as compared with conventional electric ones.View full abstractDownload PDF (343K) -
Jota Koyama, Toshio Matsuda, Toshio Wakabayashi, Akemi Kamijo, Kyouji ...Article type: Article
Session ID: ROFT2002-34
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRecently, there has been a great deal of interest in cancer therapy due to electromagnetic wave irradiation. In this paper, we considered anti-tumor effects for cancer cells due to electric field irradiation. Cancer cells which were used in the experiments are LLC(Lewis Lung Carcinoma). Activity ratio is measured by using MTT method. Results which were obtained by non-thermal experiments are shown in figures and considered.View full abstractDownload PDF (521K) -
Kazuyuki SAITOArticle type: Article
Session ID: ROFT2002-35
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn recent years, various types of applications of the microwaves have been investigated and have been applied to the minimally invasive microwave thermal therapy. They are interstitial microwave hyperthermia and microwave coagulation therapy (MCT) for thermal treatment for cancer, cardiac catheter ablation for ventricular arrhythmia treatment, thermal treatment of benign prostatic hypertrophy and so on. The authors have been studying heating characteristics of thin coaxial antennas for the interstitial microwave hyperthermia and the MCT by using the numerical caldilations. In this paper, we introduce some results in view of clinical trials.View full abstractDownload PDF (821K) -
Article type: Appendix
Pages 53-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (79K) -
Article type: Appendix
Pages 53-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (79K)
- |<
- <
- 1
- >
- >|