Between Quality Relation Tolerance

Between Quality Relation Tolerance

(1)From the factor analysis on the subjective evaluation, the following factors were obtained: "the picture quality", "the sensation of presence", "the comprehensibility", "the advantage of distance leaning" and "the teaching content". 2 Shin SHIROMA, Minoru NAKAYAMA, Kanji AKAHORI, Isao YOSHIDA, Seiji HATTORI, Yasutaka SHIMIZU: Development and Evaluation of Videophone-Aided Personal Education System. The purpose of this paper is to make clear a tolerance of distortion in picture quality for a distance learning using the DV movie based on the subjective evaluation.
2% on a presentation type for the condition that a subjective score is larger than 3.
In addition to a network congestion, a degree of picture distortion depends on an amount of and a speed of motion of an original DV movie. The experimental protocol was as follows.
On the other hand, in a presentation type, a lecturer used a presentation software on an personal computer, where he was almost motionless except for speaking and indicating a screen using a fescue. 3 6 Takashi FUJIKI, Masato TSURU, Takeshi IKENAGA, Chiaki NAKAMURA, Shinichi KAMOHARA, Hideo KURODA: Practice and Evaluation of Distance Classes with ISDN and PHS on Moral Education for Primary School. I thought this distance education system was good in a comprehensive 19. vKmw‹Ýã–5š7ÅÇü`h‡Ø¾½X?¬–Û§7ÿþbú74’ýûb÷1dUô5ûówH4{÷îc ª ÞÞßÃ+øûÊÿì6üÅåÕ×»Åêöi‚‡Ä¼Í~?…×¢±bGýñóÃráÑøîß9¸«ûÝæwùÙ;èêSHrúýdßÞ_OßZ@åümºØlŸ¡¡¯àüó+¦»\BQ ÇØYeÁ"®Ë+(Öö ê¬óü"+x'JÍÚaãÀÿ&û¯üÁ6Œ'¥“Ò§‡õ¦ÉÌœÍó—繸ùú·Õåîæ \.
(a) Factor1: "the picture quality"(b) Factor2: "the sensation of presence"(c) Factor3: "the comprehensibility" (d) Factor4: "the advantage of distance learning"(e) Factor5: Fig. Graduate School of Decision Science and Technology, Tokyo Institute of Technology Ohokayama 2-12-1, Meguro-ku, Tokyo, 152-8550 Japan. 5 (the presentation type) on "the advantage of distance learning" in Table 7 are comparable to their 3. 328-333, 1999 7 WIDE PROJECT (2000) DV Stream on IEEE1394 Encapsulated into IP. Data loss rate of the subjective scores larger than 2. advantage of distance learning ‚~ means a subjective score cannot be obtained even if there is no load.
Each item is evaluated on an ascending risk scale of 4 to 1 (4: I think so, 3: I think so approximately, 2: I don't think so approximately, 1: I don't think so). The specifications of four PCs are listed in Table 3. When a communication line is shared, some of the data should be lost. 5, each factor was given a factor name as follows, "the picture quality", "the sensation of presence", "the comprehensibility", "the advantage of distance learning", and "the teaching content" as shown Table 5. First, a participant was explained the purpose and protocol of the experiment and got training session to observe the practice movies and answer the questionnaire. Recently, a distance learning system with high quality movies were made on a trial by using DV (Digital Video), MPEG2 movie, and a gigabit network78. The distorted DV movie was recorded for a subjective evaluation. Therefore, the tolerance of the data loss rate of this study has the same order with the result of Watanabe et. They conducted the experiment of DVTS between Japan and United States in 1998. investigated a difference in picture quality between an analogue movie and an 1.
I recognized an expression of a people on the screen. The DVTS (Digital Video Transport System) was developed by WIDE project for distributing DV data through a network7.
When a relation between picture quality and learning effects is investigated, the degree of distortion in picture quality must be controlled. 9 mpeg2ts(MPEG2 over IP Transfer System). This value is comparable to Watanabes' 3. On "the comprehensibility", it should be less than 3. The tolerance for a face-to-face type becomes severer than a presentation type because a motion speed of a face-to-face type is faster than a presentation type. This is because a face-to-face type contains faster motions than a presentation type. As a result, the data loss rate of DV movie should be less than 1. It is difficult to generalize a relation between picture quality and learning effects for a distance learning. (4)From the point of view for the factors on "the picture quality", "the sensation of plastic sheet for packaging presence" and "the advantage of distance learning", the tolerance of a face-to-face type is severer than a presentation type. Evaluation of a Tolerance of a Picture Distortion for Distance Learning Evaluation of a Tolerance of a Picture Distortion for Distance Learning Takashi FUJIKI1, Masao MUROTA2, Yasutaka Faculty of Education, Nagasaki University_1 Graduate School of Decision Science and Technology, Tokyo Institute of Technology_2 Educational Resource Center, National Institute of Educational there goes the fear Policy Research Key words: highland kennel terrier west DV movie, distance learning, distortion in picture quality, data loss rate, subjective evaluation In this paper, a tolerance of distortion in picture quality was investigated quantitatively for a distance learning using a DV(Digital Video) movie.

The list of items, factor loading, and factor names are shown in Table 5. Congested Network Environment The original DV movie is transmitted from PC for transmission to PC for reception by DVTS (Digital Video Transport System). I didn't feel tired psychologically. 5 even if there is no load Table 7. The subjective scores on the factors of "the picture quality", "the sensation of presence", and "the advantage of a distance learning" were more sensitive to a distortion in picture quality than the other two factors.
By the items whose value of factor loadings are larger than 0. As shown in these figures, when the data loss rate has the same value, the subjective scores of a presentation type is larger than a face-to-face type for "the picture quality", "the sensation of presence", and "the advantage of distance learning". The original DV movie was transmitted through the congested network environment.

However, the tolerant data loss rate of this study is more extensive than Watanabes' result abc canadian rockies tour in comparison with "the teaching content" and "the comprehensibility". 5% on a face-to-face type, and less than 6.

As shown in Table 6, the three factors, "the picture quality", "the sensation of presence" and "the advantage of distance learning" have larger values than 1.

5 (the face-to-face type) on "the picture quality", and of 2. I got the sensation of presence. In this paper, two types of original pictures were prepared. In this evaluation, an instructions was given to participants to evaluate the distorted movie comparing with the original Table 5. I recognized the presentation screen (white board or PowerPoint 17.

A transmitted movie is received by lenoir city high school PC for reception, sent to DV camera via IEEE 1394 board, and recorded by DV camera. However, the values for "the comprehensibility" and "the teaching content" are less than 0. 10 DBS: Distributed Benchmark System. Especially a DV movie makes it possible to develop high quality system easily at low cost.
2Congested Network Environment A configuration of yahoo financial message boards a congested network environment to distort movies are illustrated in Fig. reported a relation between picture/audio quality and a packet loss for a distance lecture using a high quality DV movie on a gigabit network8. I didn't worry about flicker of the screen 03. Bunkyo machi 1-14, Nagasaki city, Nagasaki, 852-8521 Japan. 5% for a presentation type of lecture. Each type of lecture has three movies. The DVTS setting values are listed in Table 4. 0% and the results in Table 7, their result fits the subjective score of 2. Third, he evaluated the six distorted movies of this original movie in the order of distortion. I felt as if I were on the screen.

235-243, 4 Osamu UI, Minoru NAKAYAMA, Yasutaka SHIMIZU: Evaluation of Two Different Delivery Systems for Distance Education by Satellite. The evaluation was made for distorted Twenty one undergraduate students participated in the experiment.

PC for transmission / reception Intel Express pro 100(10/100 auto switch) 3Com 3C905B-TX(10/100 auto switch) 3Com 3C905B-TX(10/100 auto switch) The subjective questionnaire had 27 items about picture quality and class contents.

Cumulative Contribution Ratio The factor analysis was carried out on the data of a subjective evaluation with Principal Components and Varimax Rotation. 2, example still pictures from both type of lectures are shown.
Those values are listed in Table 7.

On "the picture quality", the tolerance of data loss rate should be less than 2.