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223. Harvey Stanley Hecht, MD: a conversation with the editor.

Author

Hecht, H S

Subjects
*DIABETES complications, *HEART disease diagnosis, *COMPARATIVE studies, *COMPUTED tomography, *EXERCISE tests, *HEART diseases, *HIGH density lipoproteins, *HYPERLIPIDEMIA, *RESEARCH methodology, *MEDICAL cooperation, *PARTICLES, *RESEARCH, *EVALUATION research, *DISEASE complications, *DIAGNOSIS
Published
2000
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224. Computer Standards

Author

Hecht, H.

Subjects
Standard, ANSI, ISO, IEEE, Professional Associations
Published
1984

225. Axis Rotation and Visually Induced Motion Sickness: The Role of Combined Roll, Pitch, and Yaw Motion.

Author

Keshavarz, B. and Hecht, H.

Abstract

Background: Motion sickness (MS) is a well-known phenomenon in aviation and in virtual environments such as simulators or computer games. The severity of MS is thought to be due to the amount of sensory conflict, which should increase with the complexity of the simulated motion. The present study focused on the direction and complexity of simulated body rotations in the genesis and severity of visually induced MS. Methods: Three simulated rollercoaster rides including translational movement in the fore-aft axis and additional rotational motion either in pitch only, along the pitch and roll axes, or in pitch, roll, and yaw were generated. We presented video clips of 15 min on a large projection screen to a total number of 61 volunteers, who were randomly assigned to 1 of the 3 rotational motion groups. MS was measured using the Fast Motion Sickness Scale (20-point verbal rating scale) and the Simulator Sickness Questionnaire. Aftereffects were captured up to 5 h after the experiment was finished. Results: Analyses indicated lowest MS scores in the pitch-only condition (1.95). Dual- (4.33) or triple-axis (5.30) combinations revealed significantly higher MS scores than the single-axis condition, but surprisingly did not differ from each other. MS started to subside rapidly after about 1 h past stimulus presentation. Discussion: We conclude that the complexity of visual motion does not increase MS linearly. Instead, we propose that MS reached a plateau in the dual-axis condition and adding a third rotational axis did not further surpass the severity of MS reached. [ABSTRACT FROM AUTHOR]

Published
2011
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226. Fault-Tolerant Software for Real-Time Applications.

Author

Hecht, H.

Subjects
*FAULT-tolerant computing, *RELIABILITY in engineering, *REAL-time computing, *COMPUTER software, *ERRORS, *BACK up systems
Abstract

To deal with hardware reliability requirements of critical real-time computer applications, fault-tolerance provisions have become a widely accepted practice. Failures of software executing on these computers is equally critical, and the extension of fault tolerance to software is therefore desirable but it needs to be implemented in a specific manner. Redundancy in fault-tolerant software requires program that are deliberately different from the original ones which they are intended to back up. Error detection and rollback provisions must be as independent as possible of the software segments which they protect. The recovery block concept pioneered by Randell meets these requirements. Skeleton routines are presented that illustrate the application of the recovery block to real-time programs, particularly those dealing with navigation and attitude control. The concept is seen to be compatible with certain ad hoc fault-tolerance techniques that are currently employed. A technique for reliability analysis of the resulting software system is developed. While specific software failure data are unfortunately not yet available, the exercise of this reliability model with a range of hypothetical failure rates shows that a very appreciable desensitization of the overall computer performance to software errors is possible by use of these fault-tolerance provisions. Economic factors of applying fault-tolerant software are discussed. Memory coat for the additional software segments is an obstacle at present but will probably shrink to insignificance in the future. A positive approach to the fault-tolerant software concepts seems warranted. A program for research to more fully explore the capabilities and limitations is suggested. [ABSTRACT FROM AUTHOR]

Published
1976
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234. Geschlechtskrankheiten.

Author

Juliusberg, Fritz, Burkhard, Hans, Joseph, Max, Baer, Theodor, Hecht, H., Kraus, Alfred, Lion, V., Bandler, Viktor, Leibkind, Max, Winkler, Max, and Lewandowsky, F.

Published
1918
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235. Syphilis. Allgemeiner Teil.

Author

Joseph, Max, Bandler, Viktor, Lion, V., Hecht, H., Münchheimer, F., Juliusberg, Fritz, Lewandowsky, F., Leibkind, Max, and Boas, Harold

Published
1915
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236. Hautkrankheiten.

Author

Juliusberg, Fritz, Boas, Harald, Balban, Wilhelm, Kraus, Alfred, Baer, Theodor, Lion, V., Winkler, Max, Hamburger, H., Pick, Walther, Leibkind, Max, Joseph, Max, Lewandowsky, F., Hecht, H., Schmitt, Artur, Münchheimer, F., and Bandler, Viktor

Published
1915
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237. Geschlechts-Krankheiten.

Author

Juliusberg, Fritz, Pick, Walther, Lion, V., Joseph, Max, Leibkind, Max, Kraus, Alfred, Boas, Harald, Münchheimer, F., Silberstein, Balban, Wilhelm, Lewandowsky, F., Winkler, Max, Baer, Theodor, Bandler, Viktor, Hecht, H., Stern, Marg, and Burkhard, Hans

Published
1915
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244. Kunstfehler. Ärzterecht.

Author

Neurath, Neubürger, Pette, Hecht, H., Taterka, Hans, Ruge, Schall, Hirsch, Caesar, Schlittler, Hubmann, Hook, Merkel, H., Hauswaldt, Bode, Hempel, Erich, Bange, Klestadt, Loebell, Haim, and Lenz

Published
1931
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