1982 …2019

Research output per year

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Research Output

2004

The workbook approach to making estimates and projecting future scenarios of HIV/AIDS in countries with low level and concentrated epidemics

Walker, N., Stover, J., Stanecki, K., Zaniewski, A. E., Grassly, N. C., Garcia-Calleja, J. M. & Ghys, P. D., Aug 1 2004, In : Sexually transmitted infections. 80, SUPPL. 1, p. i10-i13

Research output: Contribution to journalReview article

Uncertainty in estimates of HIV/AIDS: The estimation and application of plausibility bounds

Grassly, N. C., Morgan, M., Walker, N., Garnett, G., Stanecki, K. A., Stover, J., Brown, T. & Ghys, P. D., Aug 1 2004, In : Sexually transmitted infections. 80, SUPPL. 1, p. i31-i38

Research output: Contribution to journalReview article

2003

Back to basics in HIV prevention: Focus on exposure

Pisani, E., Garnett, G. P., Brown, T., Stover, J., Grassly, N. C., Hankins, C., Walker, N. & Ghys, P. D., Jun 21 2003, In : British medical journal. 326, 7403, p. 1384-1387 4 p.

Research output: Contribution to journalReview article

Estimates of HIV-1 prevalence from national population-based surveys as a new gold standard

Boerma, J. T., Ghys, P. D. & Walker, N., Dec 6 2003, In : Lancet. 362, 9399, p. 1929-1931 3 p.

Research output: Contribution to journalComment/debate

Estimation of "needs" and "probable uptake" for HIV/AIDS preventive vaccines based on possible policies and likely acceptance (a WHO/UNAIDS/IAVI study)

Esparza, J., Chang, M. L., Widdus, R., Madrid, Y., Walker, N. & Ghys, P. D., May 16 2003, In : Vaccine. 21, 17-18, p. 2032-2041 10 p.

Research output: Contribution to journalArticle

Growing in silence: selected regions and countries with expanding HIV/AIDS epidemics.

Ghys, P. D., Saidel, T., Vu, H. T., Savtchenko, I., Erasilova, I., Mashologu, Y. S., Indongo, R., Sikhosana, N. & Walker, N., 2003, In : AIDS (London, England). 17 Suppl 4, p. S45-50

Research output: Contribution to journalReview article

HIV surveillance: A global perspective

Pisani, E., Lazzari, S., Walker, N. & Schwartländer, B., Feb 2003, In : Journal of Acquired Immune Deficiency Syndromes. 32, SUPPL. 1, p. S3-S11

Research output: Contribution to journalReview article

Maintaining usability during 3D placement despite delay

Watson, B., Walker, N., Woytiuk, P. & Ribarsky, W., Jan 1 2003, Proceedings - IEEE Virtual Reality 2003, VR 2003. Chen, J., Loftin, B., Neumann, U., Takemura, H. & Froehlich, B. (eds.). IEEE Computer Society, p. 133-140 8 p. 1191131. (Proceedings - IEEE Virtual Reality; vol. 2003-January).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Methods and procedures for estimating HIV/AIDS and its impact: The UNAIDS/WHO estimates for the end of 2001

Walker, N., Stanecki, K. A., Brown, T., Stover, J., Lazzari, S., Garcia-Calleja, J. M., Schwartländer, B. & Ghys, P. D., Oct 17 2003, In : AIDS. 17, 15, p. 2215-2225 11 p.

Research output: Contribution to journalArticle

The growing burden of tuberculosis: Global trends and interactions with the HIV epidemic

Corbett, E. L., Watt, C. J., Walker, N., Maher, D., Williams, B. G., Raviglione, M. C. & Dye, C., May 12 2003, In : Archives of internal medicine. 163, 9, p. 1009-1021 13 p.

Research output: Contribution to journalReview article

2002

AIDS in Africa.

Ghys, P. D., Walker, N. & Hankins, C., Nov 2 2002, In : Lancet. 360, 9343, p. 1425; author reply 1425

Research output: Contribution to journalLetter

AIDS in Africa [2] (multiple letters)

Gisselquist, D., Potterat, J. J., Epstein, P., Vachon, F., Minkin, S. F., Buvé, A., Clerici, M., Boasso, A., Rizzardini, G., Deshpande, A., Biasin, M., Konotey-Ahulu, F. I. D., Ghys, P. D., Walker, N., Hankins, C. & Parkhurst, J., Nov 2 2002, In : Lancet. 360, 9343, p. 1422-1425 4 p.

Research output: Contribution to journalLetter

Can we reverse the HIV/AIDS pandemic with an expanded response?

Stover, J., Walker, N., Garnett, G. P., Salomon, J. A., Stanecki, K. A., Ghys, P. D., Grassly, N. C., Anderson, R. M. & Schwartländer, B., Jul 6 2002, In : Lancet. 360, 9326, p. 73-77 5 p.

Research output: Contribution to journalArticle

Estimated global distribution and regional spread of HIV-1 genetic subtypes in the year 2000

Osmanov, S., Pattou, C., Walker, N., Schwardländer, B., Esparza, J., Abimiku, A., Barre-Sinoussi, F., Biberfield, G., Birx, D., Bobkov, A., Von Briesen, H., Dietrich, U., Chappey, C., Galvao-Castro, B., Morgado, M., Tanuri, A., Goudsmit, J., Lukashov, L., Van der Groen, G., Heyndrickx, L. & 24 others, Janssen, W., Hahn, B., Gao, F., Hoelscher, M., Kaleebu, P., Sempala, S., Kalish, M., Korber, B., Lopez-Galindez, C., M'Boup, S., McCutchan, F., Mhalu, F., Lyamuya, E., Mullins, J., Najera, R., Nkengasong, J., Peeters, M., Delaporte, E., Salminen, M., Salomon, H., Samuel, N. M., Shao, Y., Wasi, C. & Williamson, C., Feb 1 2002, In : Journal of Acquired Immune Deficiency Syndromes. 29, 2, p. 184-190 7 p.

Research output: Contribution to journalArticle

Estimating HIV/AIDS prevalence in countries with low-level and concentrated epidemics: The example of Honduras

Ramón, J. S., Alvarenga, M., Walker, N., Garcia-Calleja, J. M. & Zacarias, F., Dec 1 2002, In : AIDS. 16, SUPPL. 3, p. S18-S22

Research output: Contribution to journalArticle

Improved methods and assumptions for estimation of the HIV/AIDS epidemic and its impact: Recommendations of the UNAIDS Reference Group on estimates, modelling and projections

Artzrouni, M., Brown, T., Feeney, G., Garnett, G., Ghys, P., Grassly, N., Lazzari, S., Schneider, D., Stanecki, K., Stover, J., Schwartländer, B., Walker, N., Way, P., Yan, P., Zaba, B., Zlotnik, H., Boerma, T., Brahmbhatt, H., Calleja, J. M., Chin, J. & 16 others, Coutinho, R., Dabis, F., De Cock, K., Fitzgerald, D., Garnett, G., Gray, R., Kitayaporn, D., Landmann Szwarcwald, C., Morgan, D., Peerpatanapokin, W., Rangsin, R., Reddy, D. K., De Vincenzi, I., Monasch, R., Peeranapatopokin, W. & Timæus, I., Jun 14 2002, In : AIDS. 16, 9, p. W1-W14

Research output: Contribution to journalArticle

Meeting international goals in child survival and HIV/AIDS

Walker, N., Schwartländer, B. & Bryce, J., Jul 27 2002, In : Lancet. 360, 9329, p. 284-289 6 p.

Research output: Contribution to journalArticle

Status of the HIV/AIDS epidemic and methods to monitor it in the Latin America and Caribbean region

Garcia Calleja, J. M., Walker, N., Cuchi, P., Lazzari, S., Ghys, P. D. & Zacarias, F., Dec 1 2002, In : AIDS. 16, SUPPL. 3, p. S3-S12

Research output: Contribution to journalArticle

2001

Epidemiological analysis of the quality of HIV sero-surveillance in the world: How well do we track the epidemic?

Walker, N., Garcia-Calleja, J. M., Heaton, L., Asamoah-Odei, E., Poumerol, G., Lazzari, S., Ghys, P. D., Schwartländer, B. & Stanecki, K. A., Aug 17 2001, In : AIDS. 15, 12, p. 1545-1554 10 p.

Research output: Contribution to journalArticle

Resource needs for HIV/AIDS

Schwartländer, B., Stover, J., Walker, N., Bollinger, L., Gutierrez, J. P., McGreevey, W., Opuni, M., Forsythe, S., Kumaranayake, L., Watts, C. & Bertozzi, S., Jun 29 2001, In : Science. 292, 5526, p. 2434-2436 3 p.

Research output: Contribution to journalArticle

The global impact of HIV/AIDS

Piot, P., Bartos, M., Ghys, P. D., Walker, N. & Schwartländer, B., Apr 19 2001, In : Nature. 410, 6831, p. 968-973 6 p.

Research output: Contribution to journalReview article

2000

AIDS in a new millennium

Schwartländer, B., Garnett, G., Walker, N. & Anderson, R., Jul 7 2000, In : Science. 289, 5476, p. 64-67 4 p.

Research output: Contribution to journalReview article

Modeling and analysis of a dynamic judgment task using a Lens Model approach

Bisantz, A. M., Kirlik, A., Gay, P., Phipps, D. A., Walker, N. & Fisk, A. D., Nov 1 2000, In : IEEE Transactions on Systems, Man, and Cybernetics Part A:Systems and Humans.. 30, 6, p. 605-616 12 p.

Research output: Contribution to journalArticle

1999

Country-specific estimates and models of HIV and AIDS: Methods and limitations

Schwartländer, B., Stanecki, K. A., Brown, T., Way, P. O., Monasch, R., Chin, J., Tarantola, D. & Walker, N., Jan 1 1999, In : AIDS. 13, 17, p. 2445-2458 14 p.

Research output: Contribution to journalArticle

Evaluating the importance of multi-sensory input on memory and the sense of presence in virtual environments

Dinh, H. Q., Walker, N., Hodges, L. F., Song, C. & Kobayashi, A., Jan 1 1999, p. 222-228. 7 p.

Research output: Contribution to conferencePaper

Managing temporal detail in virtual environments: Relating system responsiveness to feedback

Watson, B., Walker, N., Ribarsky, B. & Spaulding, V., Dec 1 1999, p. 280-281. 2 p.

Research output: Contribution to conferencePaper

1998

Effects of variation in system responsiveness on user performance in virtual environments

Watson, B., Walker, N., Ribarsky, W. & Spaulding, V., Sep 1998, In : Human Factors. 40, 3, p. 403-414 12 p.

Research output: Contribution to journalArticle

Functional limitations to daily living tasks in the aged: A focus group analysis

Rogers, W. A., Meyer, B., Walker, N. & Fisk, A. D., Mar 1 1998, In : Human Factors. 40, 1, p. 111-125 15 p.

Research output: Contribution to journalArticle

Training in virtual environments: Analysis of task appropriateness

Philbin, D. A., Ribarsky, W., Walker, N. & Hubbard, C. E., Jan 1 1998. 1 p.

Research output: Contribution to conferencePaper

1997

Age group differences in World Wide Web navigation

Meyer, B., Sit, R. A., Spaulding, V. A., Mead, S. E. & Walker, N., Mar 22 1997, CHI 1997 Extended Abstracts on Human Factors in Computing Systems: Looking to the Future, CHI EA 1997. Association for Computing Machinery, Vol. 22-27-March-1997. p. 295-296 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Aging and decision making: Driving-related problem solving

Walker, N., Fain, W. B., Fisk, A. D. & McGuire, C. L., Sep 1 1997, In : Human Factors. 39, 3, p. 438-444 7 p.

Research output: Contribution to journalArticle

An evaluation of level of detail degradation in head-mounted display peripheries

Watson, B., Walker, N., Hodges, L. F. & Reddy, M., Jan 1 1997, In : Presence: Teleoperators and Virtual Environments. 6, 6, p. 630-637 8 p.

Research output: Contribution to journalArticle

A program for parsing mouse movements into component submovements

Walker, N., Philbin, D., Worden, A. & Smelcer, J. B., Jan 1 1997, In : Behavior Research Methods, Instruments, and Computers. 29, 3, p. 456-460 5 p.

Research output: Contribution to journalArticle

Open Access

Effects of age and training on World Wide Web navigation strategies

Mead, S. E., Spaulding, V. A., Sit, R. A., Meyer, B. & Walker, N., Dec 1 1997, In : Proceedings of the Human Factors and Ergonomics Society. 1, p. 152-156 5 p.

Research output: Contribution to journalConference article

Evaluation of the effects of frame time variation on VR task performance

Watson, B., Spaulding, V., Walker, N. & Ribarsky, W., Jan 1 1997, p. 38-44. 7 p.

Research output: Contribution to conferencePaper

Making computers easier for older adults to use: Area cursors and sticky icons

Worden, A., Walker, N., Bharat, K. & Hudson, S., Jan 1 1997, p. 266-271. 6 p.

Research output: Contribution to conferencePaper

Managing level of detail in virtual environments: A perceptual framework

Reddy, M., Watson, B., Walker, N. & Hodges, L. F., Jan 1 1997, In : Presence: Teleoperators and Virtual Environments. 6, 6, p. 658-666 9 p.

Research output: Contribution to journalReview article

Managing level of detail through head-tracked peripheral degradation: A model and resulting design principles

Watson, B., Walker, N. & Hodges, L. F., Dec 1 1997, p. 59-63. 5 p.

Research output: Contribution to conferencePaper

Managing Level of Detail through Peripheral Degradation

Watson, B., Walker, N., Hodges, L. F. & Worden, A., Dec 1 1997, In : ACM Transactions on Computer-Human Interaction. 4, 4, p. 323-346 24 p.

Research output: Contribution to journalArticle

Operator specific modeling of identification judgments in a complex dynamic task

Gay, P., Phipps, D. A., Bisantz, A. M., Walker, N., Kirlik, A. & Fisk, A. D., Dec 1 1997, In : Proceedings of the Human Factors and Ergonomics Society. 1, p. 225-229 5 p.

Research output: Contribution to journalConference article

Specifying training needs in dynamic judgment tasks using a lens model approach

Bisantz, A. M., Gay, P., Phipps, D. A., Walker, N., Kirlik, A. & Fisk, A. D., Dec 1 1997, In : Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. 2, p. 1849-1854 6 p.

Research output: Contribution to journalConference article

1996

A survey of automatic teller machine usage across the adult life span

Rogers, W. A., Cabrera, E. F., Walker, N., Gilbert, D. K. & Fisk, A. D., Mar 1 1996, In : Human Factors. 38, 1, p. 156-166 11 p.

Research output: Contribution to journalArticle

Effectiveness of spatial level of detail degradation in the periphery of head-mounted displays

Watson, B., Walker, N. & Hodges, L. F., Jan 1 1996, p. 227-228. 2 p.

Research output: Contribution to conferencePaper

Mouse accelerations and performance of older computer users

Walker, N., Millians, J. & Worden, A., Jan 1 1996, In : Proceedings of the Human Factors and Ergonomics Society. 1, p. 151-154 4 p.

Research output: Contribution to journalConference article

Simple strategies or simple tasks? Dynamic decision making in 'complex' worlds

Kirlik, A., Rothrock, L., Walker, N. & Fisk, A. D., Jan 1 1996, In : Proceedings of the Human Factors and Ergonomics Society. 1, p. 184-188 5 p.

Research output: Contribution to journalConference article

Subgoal identification and error analysis in problem solving

Morton, K., Thomas, E. W., Walker, N. & Marr, J., Dec 1 1996, In : Proceedings - Frontiers in Education Conference. p. 74-77 4 p.

Research output: Contribution to journalConference article

Supporting perception in the service of dynamic decision making

Kirlik, A., Walker, N., Fisk, A. D. & Nagel, K., Jun 1 1996, In : Human Factors. 38, 2, p. 288-299 12 p.

Research output: Contribution to journalReview article

Training interface design and task analytic methods

Crosland, M. B., Walker, N., Corso, G. M. & Sparre, E., Jan 1 1996, In : Proceedings of the Human Factors and Ergonomics Society. 2, p. 1065-1069 5 p.

Research output: Contribution to journalConference article

Training older adults to use automatic teller machines

Rogers, W. A., Fisk, A. D., Mead, S. E., Walker, N. & Cabrera, E. F., Sep 1 1996, In : Human Factors. 38, 3, p. 425-433 9 p.

Research output: Contribution to journalArticle