Advances in Human-Computer Interaction http://www.hindawi.com The latest articles from Hindawi Publishing Corporation © 2014 , Hindawi Publishing Corporation . All rights reserved. Dimensions of Situatedness for Digital Public Displays Mon, 22 Dec 2014 00:10:04 +0000 http://www.hindawi.com/journals/ahci/2014/474652/ Public displays are often strongly situated signs deeply embedded in their physical, social, and cultural setting. Understanding how the display is coupled with on-going situations, its level of situatedness, provides a key element for the interpretation of the displays themselves but is also an element for the interpretation of place, its situated practices, and its social context. Most digital displays, however, do not achieve the same sense of situatedness that seems so natural in their nondigital counterparts. This paper investigates people’s perception of situatedness when considering the connection between public displays and their context. We have collected over 300 photos of displays and conducted a set of analysis tasks involving focus groups and structured interviews with 15 participants. The contribution is a consolidated list of situatedness dimensions that should provide a valuable resource for reasoning about situatedness in digital displays and informing the design and development of display systems. Rui José, Nuno Otero, and Jorge C. S. Cardoso Copyright © 2014 Rui José et al. All rights reserved. The Interplay between Usability and Aesthetics: More Evidence for the “What Is Usable Is Beautiful” Notion Tue, 25 Nov 2014 14:46:56 +0000 http://www.hindawi.com/journals/ahci/2014/946239/ With respect to inconsistent findings on the interplay between usability and aesthetics, the current paper aimed to further examine the effect of these variables on perceived qualities of a mobile phone prototype. An experiment with four versions of the prototype varying on two factors, (1) usability (high versus low) and (2) aesthetics (high versus low), was conducted with perceived usability and perceived beauty, as well as hedonic experience and the system’s appeal as dependent variables. Participants of the experiment () were instructed to complete four typical tasks with the prototype before assessing its quality. Results showed that the mobile phone’s aesthetics does not affect its perceived usability, either directly or indirectly. Instead, results revealed an effect of usability on perceived beauty, which supports the “what is usable is beautiful” notion instead of “what is beautiful is usable.” Furthermore, effects of aesthetics and of usability on hedonic experience in terms of endowing identity and appeal were found, indicating that both instrumental (usability) and noninstrumental (beauty) qualities contribute to a positive user experience. Kai-Christoph Hamborg, Julia Hülsmann, and Kai Kaspar Copyright © 2014 Kai-Christoph Hamborg et al. All rights reserved. Large Display Interaction via Multiple Acceleration Curves and Multifinger Pointer Control Tue, 25 Nov 2014 00:00:00 +0000 http://www.hindawi.com/journals/ahci/2014/691507/ Large high-resolution displays combine high pixel density with ample physical dimensions. The combination of these factors creates a multiscale workspace where interactive targeting of on-screen objects requires both high speed for distant targets and high accuracy for small targets. Modern operating systems support implicit dynamic control-display gain adjustment (i.e., a pointer acceleration curve) that helps to maintain both speed and accuracy. However, large high-resolution displays require a broader range of control-display gains than a single acceleration curve can usably enable. Some interaction techniques attempt to solve the problem by utilizing multiple explicit modes of interaction, where different modes provide different levels of pointer precision. Here, we investigate the alternative hypothesis of using a single mode of interaction for continuous pointing that enables both (1) standard implicit granularity control via an acceleration curve and (2) explicit switching between multiple acceleration curves in an efficient and dynamic way. We evaluate a sample solution that augments standard touchpad accelerated pointer manipulation with multitouch capability, where the choice of acceleration curve dynamically changes depending on the number of fingers in contact with the touchpad. Specifically, users can dynamically switch among three different acceleration curves by using one, two, or three fingers on the touchpad. Andrey Esakia, Alex Endert, and Chris North Copyright © 2014 Andrey Esakia et al. All rights reserved. A Study of Correlations among Image Resolution, Reaction Time, and Extent of Motion in Remote Motor Interactions Mon, 17 Nov 2014 00:00:00 +0000 http://www.hindawi.com/journals/ahci/2014/463179/ Motor interaction in virtual sculpting, dance trainings, and physiological rehabilitation requires close virtual proximity of users, which may be hindered by low resolution of images and system latency. This paper reports on the results of our investigation aiming to explore the pros and cons of using ultrahigh 4K resolution displays (4096 × 2160 pixels) in remote motor interaction. 4K displays are able to overcome the problem of visible pixels and they are able to show more accurate image details on the level of textures, shadows, and reflections. It was our assumption that such image details can not only satisfy visual comfort of the users, but also provide detailed visual cues and improve the reaction time of users in motor interaction. To validate this hypothesis, we explored the relationships between the reaction time of subjects responding to a series of action-reaction type of games and resolution of the image used in an experiment. The results of our experiment showed that the subjects’ reaction time is significantly shorter in 4K images than in HD or VGA images in motor interaction with small motion envelope. Zoltán Rusák, Adrie Kooijman, Yu Song, Jouke Verlinden, and Imre Horváth Copyright © 2014 Zoltán Rusák et al. All rights reserved. Orchestrating End-User Perspectives in the Software Release Process: An Integrated Release Management Framework Sun, 16 Nov 2014 07:53:00 +0000 http://www.hindawi.com/journals/ahci/2014/805307/ Software bugs discovered by end-users are inevitable consequences of a vendor’s lack of testing. While they frequently result in costly system failures, one way to detect and prevent them is to engage the customer in acceptance testing during the release process. Yet, there is a considerable lack of empirical studies examining release management from end-users’ perspective. To address this gap, we propose and empirically test a release framework that positions the customer release manager in the center of the release process. Using a participatory action research strategy, a twenty-seven-month study was conducted to evaluate and improve the effectiveness of the framework through seven major and 39 minor releases. Simon Cleveland and Timothy J. Ellis Copyright © 2014 Simon Cleveland and Timothy J. Ellis. All rights reserved. PaperCAD: A System for Interrogating CAD Drawings Using Small Mobile Computing Devices Combined with Interactive Paper Thu, 13 Nov 2014 06:48:13 +0000 http://www.hindawi.com/journals/ahci/2014/908690/ Smartphones have become indispensable computational tools. However, some tasks can be difficult to perform on a smartphone because these devices have small displays. Here, we explore methods for augmenting the display of a smartphone, or other PDA, using interactive paper. Specifically, we present a prototype interface that enables a user to interactively interrogate technical drawings using an Anoto-based smartpen and a PDA. Our software system, called PaperCAD, enables users to query geometric information from CAD drawings printed on Anoto dot-patterned paper. For example, the user can measure a distance by drawing a dimension arrow. The system provides output to the user via a smartpen’s audio speaker and the dynamic video display of a PDA. The user can select either verbose or concise audio feedback, and the PDA displays a video image of the portion of the drawing near the pen tip. The project entails advances in the interpretation of pen input, such as a method that uses contextual information to interpret ambiguous dimensions and a technique that uses a hidden Markov model to correct interpretation errors in handwritten equations. Results of a user study suggest that our user interface design and interpretation techniques are effective and that users are highly satisfied with the system. WeeSan Lee and Thomas F. Stahovich Copyright © 2014 WeeSan Lee and Thomas F. Stahovich. All rights reserved. Encoding Theory of Mind in Character Design for Pedagogical Interactive Narrative Thu, 23 Oct 2014 09:52:28 +0000 http://www.hindawi.com/journals/ahci/2014/386928/ Computer aided interactive narrative allows people to participate actively in a dynamically unfolding story, by playing a character or by exerting directorial control. Because of its potential for providing interesting stories as well as allowing user interaction, interactive narrative has been recognized as a promising tool for providing both education and entertainment. This paper discusses the challenges in creating interactive narratives for pedagogical applications and how the challenges can be addressed by using agent-based technologies. We argue that a rich model of characters and in particular a Theory of Mind capacity are needed. The character architect in the Thespian framework for interactive narrative is presented as an example of how decision-theoretic agents can be used for encoding Theory of Mind and for creating pedagogical interactive narratives. Mei Si and Stacy C. Marsella Copyright © 2014 Mei Si and Stacy C. Marsella. All rights reserved. The Role of Verbal and Nonverbal Communication in a Two-Person, Cooperative Manipulation Task Thu, 07 Aug 2014 06:56:36 +0000 http://www.hindawi.com/journals/ahci/2014/375105/ Motivated by the differences between human and robot teams, we investigated the role of verbal communication between human teammates as they work together to move a large object to a series of target locations. Only one member of the group was told the target sequence by the experimenters, while the second teammate had no target knowledge. The two experimental conditions we compared were haptic-verbal (teammates are allowed to talk) and haptic only (no talking allowed). The team’s trajectory was recorded and evaluated. In addition, participants completed a NASA TLX-style postexperimental survey which gauges workload along 6 different dimensions. In our initial experiment we found no significant difference in performance when verbal communication was added. In a follow-up experiment, using a different manipulation task, we did find that the addition of verbal communication significantly improved performance and reduced the perceived workload. In both experiments, for the haptic-only condition, we found that a remarkable number of groups independently improvised common haptic communication protocols (CHIPs). We speculate that such protocols can be substituted for verbal communication and that the performance difference between verbal and nonverbal communication may be related to how easy it is to distinguish the CHIPs from motions required for task completion. Sarangi P. Parikh, Joel M. Esposito, and Jeremy Searock Copyright © 2014 Sarangi P. Parikh et al. All rights reserved. A Proactive Approach of Robotic Framework for Making Eye Contact with Humans Wed, 23 Jul 2014 07:26:22 +0000 http://www.hindawi.com/journals/ahci/2014/694046/ Making eye contact is a most important prerequisite function of humans to initiate a conversation with others. However, it is not an easy task for a robot to make eye contact with a human if they are not facing each other initially or the human is intensely engaged his/her task. If the robot would like to start communication with a particular person, it should turn its gaze to that person and make eye contact with him/her. However, such a turning action alone is not enough to set up an eye contact phenomenon in all cases. Therefore, the robot should perform some stronger actions in some situations so that it can attract the target person before meeting his/her gaze. In this paper, we proposed a conceptual model of eye contact for social robots consisting of two phases: capturing attention and ensuring the attention capture. Evaluation experiments with human participants reveal the effectiveness of the proposed model in four viewing situations, namely, central field of view, near peripheral field of view, far peripheral field of view, and out of field of view. Mohammed Moshiul Hoque, Yoshinori Kobayashi, and Yoshinori Kuno Copyright © 2014 Mohammed Moshiul Hoque et al. All rights reserved. A Large-Scale Quantitative Survey of the German Geocaching Community in 2007 Thu, 26 Jun 2014 06:59:42 +0000 http://www.hindawi.com/journals/ahci/2014/257815/ We present a large-scale quantitative contextual survey of the geocaching community in Germany, one of the world’s largest geocaching communities. We investigate the features, attitudes, interests, and motivations that characterise the German geocachers. Two anonymous surveys have been carried out on this issue in the year 2007. We conducted a large-scale qualitative general study based on web questionnaires and a more targeted study, which aimed at a comprehensive amount of revealed geocaches of a certain region. With sample sizes of (study 1: general study) and (study 2: regional study) we provide a representative basis to ground previous qualitative research in this domain. In addition, we investigated the usage of technology in combination with traditional paper-based media by the geocachers. This knowledge can be used to reflect on past and future trends within the geocaching community. Daniel Telaar, Antonio Krüger, and Johannes Schöning Copyright © 2014 Daniel Telaar et al. All rights reserved. Using Noninvasive Brain Measurement to Explore the Psychological Effects of Computer Malfunctions on Users during Human-Computer Interactions Wed, 30 Apr 2014 09:05:13 +0000 http://www.hindawi.com/journals/ahci/2014/101038/ In today’s technologically driven world, there is a need to better understand the ways that common computer malfunctions affect computer users. These malfunctions may have measurable influences on computer user’s cognitive, emotional, and behavioral responses. An experiment was conducted where participants conducted a series of web search tasks while wearing functional near-infrared spectroscopy (fNIRS) and galvanic skin response sensors. Two computer malfunctions were introduced during the sessions which had the potential to influence correlates of user trust and suspicion. Surveys were given after each session to measure user’s perceived emotional state, cognitive load, and perceived trust. Results suggest that fNIRS can be used to measure the different cognitive and emotional responses associated with computer malfunctions. These cognitive and emotional changes were correlated with users’ self-report levels of suspicion and trust, and they in turn suggest future work that further explores the capability of fNIRS for the measurement of user experience during human-computer interactions. Leanne M. Hirshfield, Philip Bobko, Alex Barelka, Stuart H. Hirshfield, Mathew T. Farrington, Spencer Gulbronson, and Diane Paverman Copyright © 2014 Leanne M. Hirshfield et al. All rights reserved. Frame-Based Facial Expression Recognition Using Geometrical Features Wed, 16 Apr 2014 08:05:05 +0000 http://www.hindawi.com/journals/ahci/2014/408953/ To improve the human-computer interaction (HCI) to be as good as human-human interaction, building an efficient approach for human emotion recognition is required. These emotions could be fused from several modalities such as facial expression, hand gesture, acoustic data, and biophysiological data. In this paper, we address the frame-based perception of the universal human facial expressions (happiness, surprise, anger, disgust, fear, and sadness), with the help of several geometrical features. Unlike many other geometry-based approaches, the frame-based method does not rely on prior knowledge of a person-specific neutral expression; this knowledge is gained through human intervention and not available in real scenarios. Additionally, we provide a method to investigate the performance of the geometry-based approaches under various facial point localization errors. From an evaluation on two public benchmark datasets, we have found that using eight facial points, we can achieve the state-of-the-art recognition rate. However, this state-of-the-art geometry-based approach exploits features derived from 68 facial points and requires prior knowledge of the person-specific neutral expression. The expression recognition rate using geometrical features is adversely affected by the errors in the facial point localization, especially for the expressions with subtle facial deformations. Anwar Saeed, Ayoub Al-Hamadi, Robert Niese, and Moftah Elzobi Copyright © 2014 Anwar Saeed et al. All rights reserved. An Intelligent Framework for Website Usability Mon, 14 Apr 2014 09:18:06 +0000 http://www.hindawi.com/journals/ahci/2014/479286/ With the major advances of the Internet throughout the past couple of years, websites have come to play a central role in the modern marketing business program. However, simply owning a website is not enough for a business to prosper on the Web. Indeed, it is the level of usability of a website that determines if a user stays or abandons it for another competing one. It is therefore crucial to understand the importance of usability on the web, and consequently the need for its evaluation. Nonetheless, there exist a number of obstacles preventing software organizations from successfully applying sound website usability evaluation strategies in practice. From this point of view automation of the latter is extremely beneficial, which not only assists designers in creating more usable websites, but also enhances the Internet users’ experience on the Web and increases their level of satisfaction. As a means of addressing this problem, an Intelligent Usability Evaluation (IUE) tool is proposed that automates the usability evaluation process by employing a Heuristic Evaluation technique in an intelligent manner through the adoption of several research-based AI methods. Experimental results show there exists a high correlation between the tool and human annotators when identifying the considered usability violations. Alexiei Dingli and Sarah Cassar Copyright © 2014 Alexiei Dingli and Sarah Cassar. All rights reserved. Interaction Tasks and Controls for Public Display Applications Thu, 10 Apr 2014 11:10:59 +0000 http://www.hindawi.com/journals/ahci/2014/371867/ Public displays are becoming increasingly interactive and a broad range of interaction mechanisms can now be used to create multiple forms of interaction. However, the lack of interaction abstractions forces each developer to create specific approaches for dealing with interaction, preventing users from building consistent expectations on how to interact across different display systems. There is a clear analogy with the early days of the graphical user interface, when a similar problem was addressed with the emergence of high-level interaction abstractions that provided consistent interaction experiences to users and shielded developers from low-level details. This work takes a first step in that same direction by uncovering interaction abstractions that may lead to the emergence of interaction controls for applications in public displays. We identify a new set of interaction tasks focused on the specificities of public displays; we characterise interaction controls that may enable those interaction tasks to be integrated into applications; we create a mapping between the high-level abstractions provided by the interaction tasks and the concrete interaction mechanisms that can be implemented by those displays. Together, these contributions constitute a step towards the emergence of programming toolkits with widgets that developers could incorporate into their public display applications. Jorge C. S. Cardoso and Rui José Copyright © 2014 Jorge C. S. Cardoso and Rui José. All rights reserved. A Hierarchical Probabilistic Framework for Recognizing Learners’ Interaction Experience Trends and Emotions Thu, 10 Apr 2014 08:04:46 +0000 http://www.hindawi.com/journals/ahci/2014/632630/ We seek to model the users’ experience within an interactive learning environment. More precisely, we are interested in assessing the relationship between learners’ emotional reactions and three trends in the interaction experience, namely, flow: the optimal interaction (a perfect immersion within the task), stuck: the nonoptimal interaction (a difficulty to maintain focused attention), and off-task: the noninteraction (a dropout from the task). We propose a hierarchical probabilistic framework using a dynamic Bayesian network to model this relationship and to simultaneously recognize the probability of experiencing each trend as well as the emotional responses occurring subsequently. The framework combines three modality diagnostic variables that sense the learner’s experience including physiology, behavior, and performance, predictive variables that represent the current context and the learner’s profile, and a dynamic structure that tracks the evolution of the learner’s experience. An experimental study, with a specifically designed protocol for eliciting the targeted experiences, was conducted to validate our approach. Results revealed that multiple concurrent emotions can be associated with the experiences of flow, stuck, and off-task and that the same trend can be expressed differently from one individual to another. The evaluation of the framework showed promising results in predicting learners’ experience trends and emotional responses. Imène Jraidi, Maher Chaouachi, and Claude Frasson Copyright © 2014 Imène Jraidi et al. All rights reserved. Pointing Devices for Wearable Computers Mon, 24 Mar 2014 11:01:08 +0000 http://www.hindawi.com/journals/ahci/2014/527320/ We present a survey of pointing devices for wearable computers, which are body-mounted devices that users can access at any time. Since traditional pointing devices (i.e., mouse, touchpad, and trackpoint) were designed to be used on a steady and flat surface they are inappropriate for wearable computers. Just as the advent of laptops resulted in the development of the touchpad and trackpoint, the emergence of wearable computers is leading to the development of pointing devices designed for them. However, unlike laptops, since wearable computers are operated from different body positions under different environmental conditions for different uses, researchers have developed a variety of innovative pointing devices for wearable computers characterized by their sensing mechanism, control mechanism, and form factor. We survey a representative set of pointing devices for wearable computers using an “adaptation of traditional devices” versus “new devices” dichotomy and study devices according to their control and sensing mechanisms and form factor. The objective of this paper is to showcase a variety of pointing devices developed for wearable computers and bring structure to the design space for wearable pointing devices. We conclude that a de facto pointing device for wearable computers, unlike laptops, is not likely to emerge. Andrés A. Calvo and Saverio Perugini Copyright © 2014 Andrés A. Calvo and Saverio Perugini. All rights reserved. Users Behavior in Location-Aware Services: Digital Natives versus Digital Immigrants Wed, 19 Mar 2014 12:48:55 +0000 http://www.hindawi.com/journals/ahci/2014/678165/ Location-aware services may expose users to privacy risks as they usually attach user’s location to the generated contents. Different studies have focused on privacy in location-aware services, but the results are often conflicting. Our hypothesis is that users are not fully aware of the features of the location-aware scenario and this lack of knowledge affects the results. Hence, in this paper we present a different approach: the analysis is conducted on two different groups of users (digital natives and digital immigrants) and is divided into two steps: (i) understanding users’ knowledge of a location-aware scenario and (ii) investigating users’ opinion toward location-aware services after showing them an example of an effective location-aware service able to extract personal and sensitive information from contents publicly available in social media platforms. The analysis reveals that there is relation between users’ knowledge and users’ concerns toward privacy in location-aware services and also reveals that digital natives are more interested in the location-aware scenario than digital immigrants. The analysis also discloses that users’ concerns toward these services may be ameliorated if these services ask for users’ authorization and provide benefits to users. Other interesting findings allow us to draw guidelines that might be helpful in developing effective location-aware services. Marco Furini Copyright © 2014 Marco Furini. All rights reserved. User-Centric Design for Mathematical Web Services Thu, 06 Mar 2014 13:11:32 +0000 http://www.hindawi.com/journals/ahci/2014/436980/ A web service is a programmatically available application logic exposed over the internet and it has attracted much attention in recent years with the rapid development of e-commerce. Very few web services exist in the field of mathematics. The aim of this paper is to seamlessly provide user-centric mathematical web services to the service requester. In particular, this paper focuses on mathematical web services for prepositional logic and set theory which comes under discrete mathematics. A sophisticated user interface with virtual keyboard is created for accessing web services. Experimental results show that the web services and the created user interface are efficient and practical. Adlin Sheeba and Chandrasekar Arumugam Copyright © 2014 Adlin Sheeba and Chandrasekar Arumugam. All rights reserved. Designing of a Personality Based Emotional Decision Model for Generating Various Emotional Behavior of Social Robots Sun, 05 Jan 2014 11:55:30 +0000 http://www.hindawi.com/journals/ahci/2014/630808/ All humans feel emotions, but individuals express their emotions differently because each has a different personality. We design an emotional decision model that focuses on the personality of individuals. The personality-based emotional decision model is designed with four linear dynamics, viz. reactive dynamic system, internal dynamic system, emotional dynamic system, and behavior dynamic system. Each dynamic system calculates the output values that reflect the personality, by being used as system matrices, input matrices, and output matrices. These responses are reflected in the final emotional behavior through a behavior dynamic system as with humans. The final emotional behavior includes multiple emotional values, and a social robot shows various emotional expressions. We perform some experiments using the cyber robot system, to verify the efficiency of the personality-based emotional decision model that generates various emotions according to the personality. Ho Seok Ahn Copyright © 2014 Ho Seok Ahn. All rights reserved. Effects of a Social Robot's Autonomy and Group Orientation on Human Decision-Making Thu, 19 Dec 2013 11:09:47 +0000 http://www.hindawi.com/journals/ahci/2013/263721/ Social attributes of intelligent robots are important for human-robot systems. This paper investigates influences of robot autonomy (i.e., high versus low) and group orientation (i.e., ingroup versus outgroup) on a human decision-making process. We conducted a laboratory experiment with 48 college students and tested the hypotheses with MANCOVA. We find that a robot with high autonomy has greater influence on human decisions than a robot with low autonomy. No significant effect is found on group orientation or on the interaction between group orientation and autonomy level. The results provide implications for social robot design. Pei-Luen Patrick Rau, Ye Li, and Jun Liu Copyright © 2013 Pei-Luen Patrick Rau et al. All rights reserved. Blind Sailors’ Spatial Representation Using an On-Board Force Feedback Arm: Two Case Studies Thu, 05 Dec 2013 18:07:58 +0000 http://www.hindawi.com/journals/ahci/2013/163718/ Using a vocal, auditory, and haptic application designed for maritime navigation, blind sailors are able to set up and manage their voyages. However, investigation of the manner to present information remains a crucial issue to better understand spatial cognition and improve navigation without vision. In this study, we asked two participants to use SeaTouch on board and manage the ship headings during navigation in order to follow a predefined itinerary. Two conditions were tested. Firstly, blind sailors consulted the updated ship positions about the virtual map presented in an allocentric frame of reference (i.e., facing north). In the second case, they used the forced-feedback device in an egocentric frame of reference (i.e., facing the ship headings). Spatial performance tended to show that the egocentric condition was better for controlling the course during displacement, whereas the allocentric condition was more efficient for building mental representation and remembering it after the navigation task. Mathieu Simonnet and Eamonn Ryall Copyright © 2013 Mathieu Simonnet and Eamonn Ryall. All rights reserved. Computer Breakdown as a Stress Factor during Task Completion under Time Pressure: Identifying Gender Differences Based on Skin Conductance Wed, 23 Oct 2013 08:04:08 +0000 http://www.hindawi.com/journals/ahci/2013/420169/ In today’s society, as computers, the Internet, and mobile phones pervade almost every corner of life, the impact of Information and Communication Technologies (ICT) on humans is dramatic. The use of ICT, however, may also have a negative side. Human interaction with technology may lead to notable stress perceptions, a phenomenon referred to as technostress. An investigation of the literature reveals that computer users’ gender has largely been ignored in technostress research, treating users as “gender-neutral.” To close this significant research gap, we conducted a laboratory experiment in which we investigated users’ physiological reaction to the malfunctioning of technology. Based on theories which explain that men, in contrast to women, are more sensitive to “achievement stress,” we predicted that male users would exhibit higher levels of stress than women in cases of system breakdown during the execution of a human-computer interaction task under time pressure, if compared to a breakdown situation without time pressure. Using skin conductance as a stress indicator, the hypothesis was confirmed. Thus, this study shows that user gender is crucial to better understanding the influence of stress factors such as computer malfunctions on physiological stress reactions. René Riedl, Harald Kindermann, Andreas Auinger, and Andrija Javor Copyright © 2013 René Riedl et al. All rights reserved. Enhanced Cognitive Walkthrough: Development of the Cognitive Walkthrough Method to Better Predict, Identify, and Present Usability Problems Wed, 09 Oct 2013 13:23:00 +0000 http://www.hindawi.com/journals/ahci/2013/931698/ To avoid use errors when handling medical equipment, it is important to develop products with a high degree of usability. This can be achieved by performing usability evaluations in the product development process to detect and mitigate potential usability problems. A commonly used method is cognitive walkthrough (CW), but this method shows three weaknesses: poor high-level perspective, insufficient categorisation of detected usability problems, and difficulties in overviewing the analytical results. This paper presents a further development of CW with the aim of overcoming its weaknesses. The new method is called enhanced cognitive walkthrough (ECW). ECW is a proactive analytical method for analysis of potential usability problems. The ECW method has been employed to evaluate user interface designs of medical equipment such as home-care ventilators, infusion pumps, dialysis machines, and insulin pumps. The method has proved capable of identifying several potential use problems in designs. Lars-Ola Bligård and Anna-Lisa Osvalder Copyright © 2013 Lars-Ola Bligård and Anna-Lisa Osvalder. All rights reserved. Virtual/Real Transfer in a Large-Scale Environment: Impact of Active Navigation as a Function of the Viewpoint Displacement Effect and Recall Tasks Tue, 24 Sep 2013 10:56:06 +0000 http://www.hindawi.com/journals/ahci/2013/879563/ The purpose of this study was to examine the effect of navigation mode (passive versus active) on the virtual/real transfer of spatial learning, according to viewpoint displacement (ground: 1 m 75 versus aerial: 4 m) and as a function of the recall tasks used. We hypothesize that active navigation during learning can enhance performances when route strategy is favored by egocentric match between learning (ground-level viewpoint) and recall (egocentric frame-based tasks). Sixty-four subjects (32 men and 32 women) participated in the experiment. Spatial learning consisted of route learning in a virtual district (four conditions: passive/ground, passive/aerial, active/ground, or active/aerial), evaluated by three tasks: wayfinding, sketch-mapping, and picture-sorting. In the wayfinding task, subjects who were assigned the ground-level viewpoint in the virtual environment (VE) performed better than those with the aerial-level viewpoint, especially in combination with active navigation. In the sketch-mapping task, aerial-level learning in the VE resulted in better performance than the ground-level condition, while active navigation was only beneficial in the ground-level condition. The best performance in the picture-sorting task was obtained with the ground-level viewpoint, especially with active navigation. This study confirmed the expected results that the benefit of active navigation was linked with egocentric frame-based situations. Grégory Wallet, Hélène Sauzéon, Florian Larrue, and Bernard N'Kaoua Copyright © 2013 Grégory Wallet et al. All rights reserved. Development of Estimating Equation of Machine Operational Skill by Utilizing Eye Movement Measurement and Analysis of Stress and Fatigue Thu, 01 Aug 2013 13:31:13 +0000 http://www.hindawi.com/journals/ahci/2013/515164/ For an establishment of a skill evaluation method for human support systems, development of an estimating equation of the machine operational skill is presented. Factors of the eye movement such as frequency, velocity, and moving distance of saccade were computed using the developed eye gaze measurement system, and the eye movement features were determined from these factors. The estimating equation was derived through an outlier test (to eliminate nonstandard data) and a principal component analysis (to find dominant components). Using a cooperative carrying task (cc-task) simulator, the eye movement and operational data of the machine operators were recorded, and effectiveness of the derived estimating equation was investigated. As a result, it was confirmed that the estimating equation was effective strongly against actual simple skill levels (). In addition, effects of internal condition such as fatigue and stress on the estimating equation were analyzed. Using heart rate (HR) and coefficient of variation of R-R interval (). Correlation analysis between these biosignal indexes and the estimating equation of operational skill found that the equation reflected effects of stress and fatigue, although the equation could estimate the skill level adequately. Satoshi Suzuki, Asato Yoshinari, and Kunihiko Kuronuma Copyright © 2013 Satoshi Suzuki et al. All rights reserved. Virtual Sectioning and Haptic Exploration of Volumetric Shapes in the Absence of Visual Feedback Tue, 16 Jul 2013 11:50:04 +0000 http://www.hindawi.com/journals/ahci/2013/740324/ The reduced behavior for exploration of volumetric data based on the virtual sectioning concept was compared with the free scanning at the use of the StickGrip linkage-free haptic device. Profiles of the virtual surface were simulated through the penholder displacements in relation to the pen tip of the stylus. One or two geometric shapes (cylinder, trapezoidal prism, ball, and torus) or their halves and the ripple surface were explored in the absence of visual feedback. In the free scanning, the person physically moved the stylus. In the parallel scanning, cross-sectional profiles were generated automatically starting from the location indicated by the stylus. Analysis of the performance of 18 subjects demonstrated that the new haptic visualization and exploration technique allowed to create accurate mental images, to recognize and identify virtual shapes. The mean number of errors was about 2.5% in the free scanning mode and 1.9% and 1.5% in the parallel scanning mode at the playback velocity of 28 mm/s and 42 mm/s, respectively. All participants agreed that the haptic visualization of the 3D virtual surface presented as the cross-sectional slices of the workspace was robust and easy to use. The method was developed for visualization of spatially distributed data collected by sensors. Tatiana V. Evreinova, Grigori Evreinov, and Roope Raisamo Copyright © 2013 Tatiana V. Evreinova et al. All rights reserved. Designing Interactive Applications to Support Novel Activities Sat, 15 Jun 2013 14:36:54 +0000 http://www.hindawi.com/journals/ahci/2013/180192/ R&D in media-related technologies including multimedia, information retrieval, computer vision, and the semantic web is experimenting on a variety of computational tools that, if sufficiently matured, could support many novel activities that are not practiced today. Interactive technology demonstration systems produced typically at the end of their projects show great potential for taking advantage of technological possibilities. These demo systems or “demonstrators” are, even if crude or farfetched, a significant manifestation of the technologists’ visions in transforming emerging technologies into novel usage scenarios and applications. In this paper, we reflect on design processes and crucial design decisions made while designing some successful, web-based interactive demonstrators developed by the authors. We identify methodological issues in applying today’s requirement-driven usability engineering method to designing this type of novel applications and solicit a clearer distinction between designing mainstream applications and designing novel applications. More solution-oriented approaches leveraging design thinking are required, and more pragmatic evaluation criteria is needed that assess the role of the system in exploiting the technological possibilities to provoke further brainstorming and discussion. Such an approach will support a more efficient channelling of the technology-to-application transformation which are becoming increasingly crucial in today’s context of rich technological possibilities. Hyowon Lee, Nazlena Mohamad Ali, and Lynda Hardman Copyright © 2013 Hyowon Lee et al. All rights reserved. Using Brain Waves to Control Computers and Machines Tue, 11 Jun 2013 12:19:38 +0000 http://www.hindawi.com/journals/ahci/2013/802063/ Christos Papadelis, Christoph Braun, Dimitrios Pantazis, Surjo R. Soekadar, and Panagiotis Bamidis Copyright © 2013 Christos Papadelis et al. All rights reserved. Controlling Assistive Machines in Paralysis Using Brain Waves and Other Biosignals Tue, 28 May 2013 17:45:27 +0000 http://www.hindawi.com/journals/ahci/2013/369425/ The extent to which humans can interact with machines significantly enhanced through inclusion of speech, gestures, and eye movements. However, these communication channels depend on a functional motor system. As many people suffer from severe damage of the motor system resulting in paralysis and inability to communicate, the development of brain-machine interfaces (BMI) that translate electric or metabolic brain activity into control signals of external devices promises to overcome this dependence. People with complete paralysis can learn to use their brain waves to control prosthetic devices or exoskeletons. However, information transfer rates of currently available noninvasive BMI systems are still very limited and do not allow versatile control and interaction with assistive machines. Thus, using brain waves in combination with other biosignals might significantly enhance the ability of people with a compromised motor system to interact with assistive machines. Here, we give an overview of the current state of assistive, noninvasive BMI research and propose to integrate brain waves and other biosignals for improved control and applicability of assistive machines in paralysis. Beside introducing an example of such a system, potential future developments are being discussed. Paulo Rogério de Almeida Ribeiro, Fabricio Lima Brasil, Matthias Witkowski, Farid Shiman, Christian Cipriani, Nicola Vitiello, Maria Chiara Carrozza, and Surjo Raphael Soekadar Copyright © 2013 Paulo Rogério de Almeida Ribeiro et al. All rights reserved. Towards Brain-Computer Interface Control of a 6-Degree-of-Freedom Robotic Arm Using Dry EEG Electrodes Tue, 07 May 2013 17:37:51 +0000 http://www.hindawi.com/journals/ahci/2013/641074/ Introduction. Development of a robotic arm that can be operated using an exoskeletal position sensing harness as well as a dry electrode brain-computer interface headset. Design priorities comprise an intuitive and immersive user interface, fast and smooth movement, portability, and cost minimization. Materials and Methods. A robotic arm prototype capable of moving along 6 degrees of freedom has been developed, along with an exoskeletal position sensing harness which was used to control it. Commercially available dry electrode BCI headsets were evaluated. A particular headset model has been selected and is currently being integrated into the hybrid system. Results and Discussion. The combined arm-harness system has been successfully tested and met its design targets for speed, smooth movement, and immersive control. Initial tests verify that an operator using the system can perform pick and place tasks following a rather short learning curve. Further evaluation experiments are planned for the integrated BCI-harness hybrid setup. Conclusions. It is possible to design a portable robotic arm interface comparable in size, dexterity, speed, and fluidity to the human arm at relatively low cost. The combined system achieved its design goals for intuitive and immersive robotic control and is currently being further developed into a hybrid BCI system for comparative experiments. Alexander Astaras, Nikolaos Moustakas, Alkinoos Athanasiou, and Aristides Gogoussis Copyright © 2013 Alexander Astaras et al. All rights reserved.