济大泉院毕业设计外文资料翻译.docx

1、济大泉院毕业设计外文资料翻译济南大学泉城学院毕业设计外文资料翻译题 目 为提高信息理解涉及的LED设计因素专 业 电气工程及其自动化 班 级 电气 学 生 XXXX 学 号 XXXXXXXXXXXXXX 指导教师 XXXXX 二一五年三月十五日Design Factors of LED Display for Improving MessageComprehensionJoey C.Y. So and Alan H.S. ChanDepartment of Manufacturing Engineering and Engineering ManagementCity University o

2、f Hong KongKowloon TongHong KongMost of the previous studies on dynamic text display were limited to small screen displays and website design. So far, no studies found on LED (light-emitting diode) display board for optimal display method. It is an interesting question of what the best display metho

3、d is to deliver electronic text messages to the public with LED displays. In this paper, some related empirical studies concerning the various display methods of dynamic text presentation, such as text display type, number of message lines and textbackground color combination are reviewed. A propose

4、d experiment of Chinese reading task on LED display under different task conditions for determining the effects of display method,number of message lines displayed, and text color on comprehension performance and subjective preference is also discussed in this paper. According to the readability and

5、 preference ratings of the subjects given under different conditions, we can make use of the proposed experiment to investigate the best display method and color for comprehending the delivered messages, and to provide useful design recommendations of using LED displays for advertising and deliverin

6、g messages to the public.INTRODUCTIONNowadays, the use of the electronic information display systems provides an extra means of delivering messages or ads to customers or people during their travels to work in our fast-paced society. The advanced display technology offers a variety of selection of c

7、olors and display methods which improve the presentation of textual information. LED (Light-emitting diode) displays widely used as a display output unit like a computer screen. It allows observers to read messages at a distance. The explosion of communication technology in the past decades and the

8、increase in use of LED displays arouse the interest in optimizing effective methods of displaying dynamic text. However, in the past, researchers only focused on the studies of dynamic text display on small screens such as cellular phones, pagers and desktop phones (Chen and Chien 2005, Laarni 2002)

9、 and some researches were concerned about the optimal dynamic text display in website design (Wang et al. 2003, Wang and Chen 2003, Wang et al. 2002). So far, no studies found on LED display board for optimal display method, in particular, Chinese reading. It is an interesting question of what the b

10、est display method is to deliver electronic text messages to the public with LED displays.The three common display methods for displaying dynamics text are: a) RSVP (Rapid Serial Visual Presentation) displays successive words of textual information at a fixed point on the screen, usually at a predet

11、ermined rate, in rapid succession; b) scrolling - a block of text moves up or down in either a relatively continuous or a line-by-line manner; and c) leading (Time Square) - presents the words by sequence and moves the string of words from right to left. In many researches on scrolling, the scrollin

12、g speed was always controllable by the operators or designers in which they moved through the document by operating a and Haselgrove 2001) or a scroll arrow (Piolat et al. 1997). However, the fixed display speed method was employed in the current experiment. Regarding the vertical scrolling, text us

13、ually moves in a line-by-line manner or scrolls continuously and automatically a raster at a time up from the bottom of the screen. Since the leading method is not practical of displaying multi-line text, only RSVP and scrolling methods were tested in the current study to investigate the effects of

14、the number of lines displayed on the comprehension performance and preference. The presentation of short text segments in RSVP eliminates eye movements and leads to a possible reduction of cognitive load (Potter 1984).Concerning the number of message lines, Wang and Cao (2005) studied the message di

15、splay format of portable dynamic message signs, their results showed that a single-line message was better than a multiple-line message. With the smaller number of lines displayed, it would facilitate readers by directing their attention to the appropriate text unit in its proper order and eliminate

16、 their need to decide where and when the eyes should move next. There are some researches reporting that color contrast of the textbackground of a dynamic display users? visual performance (Wang et al. 2002, Wang and Chen 2003). A recent study by Yang et al. (2005) about enhancing messages displayed

17、 on a dynamic message sign showed that if only one color was used, amber or green would be much preferred over red. They also found that amber-colored messages would lead to the shortest response time and that with red-colored messages, subjects would take longer time to respond to the messages. A w

18、ide range of colors is available with the LED displays, and most colors being usedare red, green, and amber.PROPOSED STUDYBased on the above literature review, it is noted that no study done on exploring the choice of effective colors or color combination, display method and number of message lines

19、for increasing the readability of messages delivered from LED displays. To fill the gap in the literature, there is a need to conduct a research study which more thoroughly investigates these factors considering comprehension performance and subjective preference.DesignThe aim of the proposed experi

20、ment is to evaluate whether display method, row number and text color would significantly affect the comprehension score and subjective preference on LED display for Chinese reading. The factors and levels studied in this experiment are as follows: two text display methods (Rapid Serial Visual Prese

21、ntation, scrolling with pause), four types of row number (one to four lines), and three text colors (red, green and amber). In each testing condition, the comprehension scores of the objective performance measure and the ratings of the subjective measure will be collected. The comprehension score of

22、 the objective performance measure denoted the correctness of subject responses given to the nine multiple choice questions in a comprehension task following the passage reading. It will be used for the evaluation of the subjects ability of understanding the passages read. The preference rating is a

23、 subjective evaluation of the testing display format given by the readers reflecting individual preference, which should also be considered when designing an optimal display method.SubjectsStudents who are registered for a course in Ergonomics in the City University of Hong Kong will serve as subjec

24、ts. They will be assessed to with an orthorator and no color deficiency with Ishihara Pesudo Isochromatic Plates.MaterialsChinese passages with no technical terms or names of unusual words on topics of will be used. The passage length, including punctuation marks, ranges from 77 to 100 characters.Ap

25、paratusA computer (Pentium VI 2.8 GHz) with a 582mm X 326 mm (include . The panel size is 512 mm X 256 mm. The LED display dot dimension is 128 dots X 64 dots and its dot diameter is 3.75 mm with 4 mm dot separation. It can display up to 4 rows of 8 traditional Chinese characters of 64 mm X 64 mm la

26、rge per line. The passages will be displayed at a rate of 160 characters per minute.Workplace ConditionsThe display will be mounted at a center. The characters size will subtend angles of 1。 13, arc at the subjects, eyes. The ambient illumination will be about 300 lx. No glare or reflection appears

27、on the display screen.ProcedureA set of question sheets with three questions on a page will be given to each subject at the beginning of the test. However, they are not allowed to preview the questions before each presentation. Subjects are asked to read the passages presented on the LED display and

28、 try their best to understand the messages. Each presentation condition consists of three passages. After reading the first passage on the display, they will be instructed to attempt the three multiple-choice questions on the first sheet of the question set. After one minute, the next passage will a

29、ppear on the display. The procedure is repeated until all the three passages in the condition are completed. Just after reading the three passages, a preference rating on that particular condition will be given by the subject on a nine-point Likert scale. The procedures are repeated until all the ei

30、ght conditions were tested. In order to avoid mental or visual fatigue, a 5-minute break is given after reading the first 12 passages.DATA ANALYSISComprehension PerformanceThe dependent measure collected in this experiment is the comprehension scores (%), i.e. the percentage of correctness denoted t

31、he reading performance of each condition. The method for calculating the percentage of correctness for each condition = (the number of questions ? the number of wrong answers) the total number of questions. The comprehension scores of individual subjects ranged from 0 to 9 were converted to 0 to 100

32、 %. To identify which display method would let candidates achieve better performance in the comprehension task, the differences amongst subjects? performance on the different display conditions will be evaluated with analysis of variance (ANOVA). Bonferroni test will be used for post comprehension score, the second measure in this reading experiment is the subjective preference reflecting an instant and quick subjective response of subjects to the reading conditions. With a nine-point Lik