Martin G. Helander
Has also published under the name of:
"Martin Helander", "M. G. Helander", and "M.G. Helander"
About the author:
No description available of Martin G. Helander...
Publications by Martin G. Helander (bibliography)
» 2004 «
Khalid, H.M., Helander, Martin G. and Yeo, Alvin W. (eds.) Work With Computing Systems WWCS June 29-July 2, 2004, Kuala Lumpur, Malaysia.
» 2001 «
Helander, Martin G. (2001): Theories and Methods in Affective Human Factors Design. In: Proceedings of the Ninth International Conference on Human-Computer Interaction 2001. pp. 357-361.
» 1997 «
Helander, Martin G., Prabhu, Prasad and Landauer, Thomas K. (1997): Handbook of Human-Computer Interaction (2nd Ed.). Amsterdam, North-Holland
» 1995 «
Paul, Rajendra D. and Helander, Martin G. (1995): Effect of Sit-Stand Schedule on Spinal Shrinkage in VDT Operators. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 563-567.
“A controlled field study was conducted to measure spinal shrinkage in office employees with sit-stand type workstations. Thirteen office employees, ten healthy and three with spinal disorders participated in the study. Using a stadiometer, changes in stature were measured at 8 a.m., 12 p.m., 1 p.m. and 5 p.m. From 12 p.m. to 1 p.m., all subjects sat for 40 minutes and walked for 20 minutes. Out of the ten healthy employees, six were instructed to stand for 30 minutes four times during the day. The remaining four subjects stood eight times 15 minutes each. Office workers who stood in 30 minute sessions experienced significantly less shrinkage than those who stood in 15 minute sessions. Office workers with spinal disorders also stood eight times 15 minutes each. They incurred a greater variability in the shrinkage pattern.”
Copyrights may apply
Vora, Pawan R. and Helander, Martin G. (1995): A Teaching Method as an Alternative to the Concurrent Think-Aloud Method for Usability Testing. In: Proceedings of the Sixth International Conference on Human-Computer Interaction July 9-14, 1995, Tokyo, Japan. pp. 375-380.
“In this paper, we propose a teaching method as an alternative to the concurrent think-aloud (CTA) method for usability evaluation. In the teaching method, the test participant, after becoming familiar with the system, demonstrates it to a seemingly naive user (a confederate) and describes how to accomplish certain tasks. In a study that compared the teaching and the CTA methods for evaluating usability of human-computer interactive tasks, the results indicated that the number of verbalizations elicited using the teaching method far exceeded those elicited using the CTA method. Also, the concurrent verbalizations were dominated by the participants' interactive behavior and provided little insight into the participants' thought processes or search strategies, which were easily captured using the teaching method.”
Copyrights may apply
» 1994 «
Vora, Pawan R., Helander, Martin G. and Shalin, Valerie L. (1994): Evaluating the Influence of Interface Styles and Multiple Access Paths in Hypertext. In: Adelson, Beth, Dumais, Susan and Olson, Judith S. (eds.) Proceedings of the ACM CHI 94 Human Factors in Computing Systems Conference April 24-28, 1994, Boston, Massachusetts. pp. 323-329. Available online
“No specific guidelines exist to assist in designing usable hypertext systems. In this paper, we discuss three experiments to study usability issues in hypertext design. In the first experiment, we investigated usability of four types of hypertext interfaces: graphical with labeled links (GL), graphical with unlabeled links (GU), textual with embedded links (TE), and textual with a separate list of related items/links (TS). The results favored GL interface for novice users. However, most subjects suggested incorporating multiple access pathways to facilitate search. To determine how hypertext designers could establish, a priori, these multiple structures, we extracted organization schemes from domain experts in the second experiment. Distinctly different organization structures emerged from experts with different professional backgrounds. Therefore, we modified the hypertext to incorporate multiple organization structures. In experiment 3, we compared subjects' performance using multiple and single organization structures. Multiple structures, contrary to previous evidence, enhanced search performance. The benefits of multiple structures, however, diminished over time. These experiments provide empirical evidence in favor of GL interfaces and incorporation of multiple organization structures to improve hypertext usability.”
Copyrights may apply
» 1993 «
Helander, Martin G. and Little, Steven E. (1993): Preferred Settings in Chair Adjustments. In: Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting 1993. pp. 448-452.
“Thirty eight subjects participated in a study to evaluate preferred (comfortable) settings of adjustable chairs including seat height, seat pan angle and back rest angle. An instrumented hydraulic chair was used. The chair was set in one of eight possible extreme position, with each chair parameters at either a high or low value. Subjects then adjusted all three parameters. A full factorial experiment with 5 factors was performed: the three adjustability parameters set at either high or low, gender and replication. Three independent variables were used: preferred seat height, back rest angle and seat pan angle. For the three ANOVA's and across two experiments, 33 statistically significant results were obtained. The initial setting of a parameter (high or low) consistently produced a significant effect in the choice of the preferred setting for the same parameter. The findings imply that there is a range of acceptable settings: for seat height about 1 in. and for the back support angle and seat back angle about 4 degrees.”
Copyrights may apply
» 1992 «
Prabhu, Girish V., Helander, Martin G. and Shalin, Valerie L. (1992): Effect of Product Structure on Manual Assembly Performance. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 729-732.
“Using Maynard's description, an assembly task may be divided into various task elements like reach, select, grasp, move, position, and assemble (Ghosh and Helander, 1985). Activities such as "reach" and "move" are governed by biomechanics of body motions including human factors principles such as Fitts' law. This research investigated the effect of the structure of the assembly and the type of assembly instructions on performance. Two different product structures were used -- a vertical assembly, built bottom-up, and a hierarchical assembly, consisting of several sub-assemblies. Two different instruction strategies were used: 1. top-down sequential instructions 2. No Instructions. The research showed that vertical products were easier for manual assembly, when provided with instructions. For all three dependant measures, there was no interaction effect between the two factors, namely product structure and instructions. Average time for completion was significant for both factors i.e. product structures (F(1,20) = 4.417, p < 0.0485) and instructions (F(1,20) = 5.886, p < 0.0248). However, time for learning was significant only for product structure factor (F(1,20) = 5.239, p < 0.033). Also, trials to learn was significant only for product structure factor (F(1,20) = 4.449, p < 0.047).”
Copyrights may apply
» 1988 «
Helander, Martin G. (ed.) (1988): Handbook of Human-Computer Interaction. Amsterdam, North-Holland
View info on Amazon.com or .co.uk 
» 1987 «
Helander, Martin G., Karwan, Mark H. and Etherton, John (1987): A Model of Human Reaction Time to Dangerous Robot Arm Movements. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 191-195.
“An increasing number of studies indicate that robots are the most hazardous equipment in industry. The very virtue that makes them attractive for industrial work, the programmable arm, is the cause of accidents since the arm motion is often difficult to perceive. The present paper presents a model of human reaction time and emergency behavior. The total reaction time is the sum of three elements: perception, decision making, and motor response. Each of these three elements are modeled using concepts such as perceptual discriminability and single detection theory. Finally, the results of an experiment is presented where the human reaction time is modeled as a function of robot arm speed.”
Copyrights may apply
Burri, George J., Czaja, Sara J., Drury, Colin G. and Helander, Martin G. (1987): A Field Evaluation of Office Chairs. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 1121-1122.
“Ten ergonomic office chairs, chosen from a sample of eighty-four, were evaluated in an ergonomic field study. Twenty office employees used each of the chairs for one day. The chairs were evaluated using four different methods: a chair feature evaluation checklist, a ranking procedure, general comfort and body part discomfort ratings. The first two methods produced positive results, including significant differences between the chairs. The chair users generally had difficulties in perceiving and expressing their comfort and discomfort associated with the latter two methods. The study identified several distinct features related to chair comfort, including the design of the seat pan, back rest, arm rests and ease of adjustability.”
Copyrights may apply
SHOW THIS LIST ON YOUR HOMEPAGE
What do YOU think?
Give us your opinion! Do you have any comments/additions
that you would like other visitors to see?
You say:
Mar 20th, 2010
Changes to this page (author)
13 Feb 2010: Enabled abstracts to be shown on Martin G. Helander's author page.09 Dec 2007: Author was added to the bibliography (approved by an editor)25 Jul 2007: Author was added to the bibliography (approved by an editor)
25 Jul 2007: Author was added to the bibliography (approved by an editor)
25 Jul 2007: Author was added to the bibliography (approved by an editor)
25 Jul 2007: Author was added to the bibliography (approved by an editor)
29 Jun 2007: Author was edited
27 Jun 2007: Author was added to the bibliography
27 Jun 2007: Author was edited
27 Jun 2007: Author was added to the bibliography
27 Jun 2007: Author was edited
26 Jun 2007: Author was edited
26 Jun 2007: Author was edited
25 Jun 2007: Author was edited
25 Jun 2007: Author was edited
28 Apr 2003: Added the author to the bibliography
