• Title, Summary, Keyword: PDAS

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Development of Microfluidic Polydiacetylene Sensor Chip for pH detection (pH 검출을 위한 미세유동 폴리디아세틸렌 센서칩 개발)

  • Hwang, Hyun-Jin;Song, Si-Mon
    • Proceedings of the KSME Conference
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    • pp.2415-2418
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    • 2008
  • Polydiacetylenes (PDAs) are very attractive chemical substances which have distinctive features of color change and fluorescence emission by thermal or chemical stress. Especially, when PDAs contact with solutions of a particular pH, such as a strong alkaline sodium hydroxide (NaOH) solution or a strong acidic hydrogen chloride (HCl) solution, PDAs change their color from non-fluorescent blue to fluorescent red. In this study, we propose a novel method to detect alkaline pH using PDAs and NaOH solutions by hydrodynamic focusing on a microfluidic chip. Preliminary results indicate that the fluorescent intensity of PDAs increases in respond to the NaOH solution concentrations. Also, the fluorescence is quenched back when the PDAs are in contact with a HCl solution. These results are useful in a microfluidic PDA sensor chip design for pH detection.

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The effect of the PC experience on the usability of PDAs - make a comparison between Palm Vx and iPAQ Pocket PC on intuitive recognition to use the PDAs, based on laboratory-based usability testing (PC사용경험이 PDA사용에 대한 직관적 인지에 미치는 영향에 관한 연구)

  • 정상훈;이건표
    • Archives of design research
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    • v.16 no.2
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    • pp.301-310
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    • 2003
  • The interface design of mobile products has become a hot issue recently as a variety of products are being developed for extended usages. There have been two different views on interface design of mobile products like PDAs(personal digital assistants) or cellular phone. One 치aims that the current interface design of PC cannot be directly applied because mobile products have their own specific functions and requirements. On the meantime, the other argues that an extended application of PC metaphors to mobile products can have advantages because users'PC experiences can reduce the learning efforts and thus contribute to intuitive understanding mobile products. In this research, two types of PDAs, developed according to the aforementioned conflicting philosophies were compared and evaluated, based on laboratory-based usability testing conducted by novice users. The experiment consists of asking subjects to perform identical tasks for the two different types of products. The interaction data collected during usability testing were analyzed in terms of time taken, rate of success of tasks and errors. The experiment shows that there were some meaningful effects of users'experience of PC on the usability of PDAs.

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A Study of PDAs Icon Design Guideline Considered User's Cognitive Human Factor (사용자 인지특성을 고려한 PDA아이콘 설계지침에 관한 연구)

  • Kim, Sang-hwan;Myung, Rohae
    • Journal of Korean Institute of Industrial Engineers
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    • v.30 no.4
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    • pp.338-345
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    • 2004
  • Personal Digital Assistants (PDAs) have become ubiquitous and continued to gain popularity. Since PDAs have some special contexts such as mobility and limited screen size, icons are utilized frequently because icons allow us to do tasks more rapidly and effectively on PDAs like another information appliances. The study presents a cognitive approach to study human factors affecting icon design with multidimensional Scaling (MDS) analysis. In the experiment, a real PDA was used to investigate 29 attributes and2 preference ratings for 22 PDA icons by 20 Korean subjects. As a result, cognitive positioning about icons, attributes, and preference data were arranged on the two dimensional perceptual map. Attributes were grouped by simplicity, universality, activity, complexity, abstraction, static, and alphanumeric time. Subjects preferences were highly related with simplicity attributes group and positive to universality and activity attributes groups. It was also confirmed that there are some icons unfitted to the mental model of Korean. However, when icons are designed for PDAs or similar information appliances to Korean, it should be designed simply and actively with universal image fitted on target users mental model.

Personal digital assistants: Essential tools for preparing dietetics professionals to use new-generation information technology

  • Jang, Mi-Young;Song, Won-O.
    • Nutrition Research and Practice
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    • v.1 no.1
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    • pp.42-45
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    • 2007
  • Rapid integration of information technology into health care systems has included the use of highly portable systems-in particular, personal digital assistants (PDAs). With their large built-in memories, fast processors, wireless connectivity, multimedia capacity, and large library of applications, PDAs have been widely adopted by physicians and nurses for patient tracking, disease management, medical references and drug information, enhancing quality of health care. Many health-related PDA applications are available to both dietetics professionals and clients. Dietetics professionals can effectively use PDAs for client tracking and support, accessing to hospital database or information, and providing better self-monitoring tools to clients. Internship programs for dietetics professionals should include training in the use of PDAs and their dietetics applications, so that new practitioners can stay abreast of this rapidly evolving technology. Several considerations to keep in mind in selecting a PDA and its applications are discussed.

Clinical Validation of the Psychotic Depression Assessment Scale, Hamilton Depression Rating Scale-6, and Brief Psychiatric Rating Scale-5: Results from the Clinical Research Center for Depression Study

  • Park, Seon-Cheol;Jang, Eun Young;Kim, Jae-Min;Jun, Tae-Youn;Lee, Min-Soo;Kim, Jung-Bum;Yim, Hyeon-Woo;Park, Yong Chon
    • Psychiatry investigation
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    • v.14 no.5
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    • pp.568-576
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    • 2017
  • Objective The aim of this study was to validate the psychotic depression assessment scale (PDAS), which includes the six-item melancholia subscale from the Hamilton depression rating scale (HAMD-6) and the five-item psychosis subscale from the brief psychiatric rating scale (BPRS-5). Data from the Clinical Research Center for Depression (CRESCEND) study, which is a 52-week naturalistic trial, were analyzed. Methods Fifty-two patients with psychotic depression from the CRESCEND study met our inclusion criteria. The patients underwent the following psychometric assessments: the PDAS, including HAMD-6 and BPRS-5, the clinical global impression scales, the HAMD, the positive symptom subscale, and the negative symptom subscale. Assessments were performed at the baseline and then at weeks 1, 2, 4, 8, 12, 24, and 52. Spearman correlation analyses were used to assess the clinical validity and responsiveness of the PDAS. Results The clinical validity and responsiveness of the PDAS, including HAMD-6 and BPRS-5, were acceptable, with the exception of the clinical responsiveness of the PDAS for positive symptoms and the clinical responsiveness of BPRS-5 for negative symptoms. Conclusion The clinical relevance of the PDAS has been confirmed and this clinical validation will enhance its clinical utility and availability.

Usability Evalulation of Button Selection Aids for PDAs (PDA 화면 내 버튼 선택을 위한 입력지원방식의 사용성 평가)

  • Park, Yong-S.;Han, Sung-H.;Moon, Jung-Tae;Jeon, Suk-Hee
    • Journal of the Ergonomics Society of Korea
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    • v.24 no.3
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    • pp.1-10
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    • 2005
  • The primary objective of this study is to design input methods for assisting button selection tasks on a PDA screen. Familiar methods in the existing computing environments were investigated to develop aiding methods. Factors manipulated in the experiment included aiding method, button size, and users' prior experience with PDAs. A total of sixteen participants examined the usability of button selection tasks. Two types of button selection tasks were used as experimental tasks; one was selecting a target button, and the other was selecting multiple target buttons consecutively. The results showed that the aiding method and the button size had significant effects on the subjective satisfaction as well as the performance. In addition, users' prior experience with PDAs affected the performance significantly. The interaction between the aiding method and the button size was found to have significant effects on the performance. However, the interaction effect between the button size and the PDA experience was significant on the task performance time only for the multiple button selection tasks. Design considerations were proposed based on the experimental results. These can be applied to the PDA interaction design to make the PDAs more usable.

Development of a Speech Recognizer on PDAs (PDA 기반 음성 인식기 개발)

  • Koo Myoung-Wan;Park Sung-Joon;Son Dan-Young;Han Ki-Soo
    • Proceedings of the KSPS conference
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    • pp.33-36
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    • 2006
  • This paper describes a speech recognizer implemented on PDAs. The recognizer consists of feature extraction module, search module and utterance verification module. It can recognize 37 words that can be used in the telematics application and fixed-point operation is performed for real-time processing. Simulation results show that recognition accuracy is 94.5% for the in-vocabulary words and 56.8% for the out-of-task words.

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Usability Evaluation of PDA Menu Design (PDA의 메뉴 제시방법에 대한 사용편의성 평가)

  • Kim, Tae-Gyeong;Han, Seong-Ho;Yu, Gi-Dong
    • Journal of the Ergonomics Society of Korea
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    • v.22 no.4
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    • pp.27-45
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    • 2003
  • PDAs(Personal Digital Assistants), one of the typical mobile devices, are examined in this study to identify the factors affecting their usability. This study focuses on the menu design of PDAs. Three factors including menu extension method, menu structure, and screen orientation were manipulated in a usability experiment. Task completion times, error rates, and degree of subjective satisfaction were measured. Guidelines for designing a PDA menu are proposed based on the experimental results.