The 60 GHz IMPATT diode development

The objective is to develop 60 GHz IMPATT diodes suitable for communications applications. The performance goals of the 60 GHz IMPATT is 1W CW output power with a conversion efficiency of 15 percent and 10-year lifetime. The final design of the 60 GHz IMPATT structure evolved from computer simulations performed at the University of Michigan. The initial doping profile, involving a hybrid double-drift (HDD) design, was derived from a drift-diffusion model that used the static velocity-field characteristics for GaAs. Unfortunately, the model did not consider the effects of velocity undershoot and delay of the avalanche process due to energy relaxation. Consequently, the initial devices were oscillating at a much lower frequency than anticipated. With a revised simulation program that included the two effects given above, a second HDD profile was generated and was used as a basis for fabrication efforts. In the area of device fabrication, significant progress was made in epitaxial growth and characterization, wafer processing, and die assembly. The organo-metallic chemical vapor deposition (OMCVD) was used. Starting with a baseline X-Band IMPATT technology, appropriate processing steps were modified to satisfy the device requirements at V-Band. In terms of efficiency and reliability, the device requirements dictate a reduction in its series resistance and thermal resistance values. Qualitatively, researchers were able to reduce the diodes' series resistance by reducing the thickness of the N+ GaAs substrate used in its fabrication

The Collapse of Difference: Dysfunctional and Inverted Celebrations in John Okada’s No-No Boy

Apres la Seconde Guerre mondiale, la question de l'identité se posa avec une acuité particulière au sein de la communauté japonaise américaine. Pendant cette période de crise et de malentendus, les rites célébratifs les plus familiers furent suspendus ou interdits. Alors que les tensions se multipliaient entre les défenseurs ou les adversaires du Japon, entre ceux qui connurent les camps et ceux qui échappèrent a l'internement, la fête « dysfonctionnelle » devient le lieu d'affrontements souvent violents.Yogi Stan. The Collapse of Difference: Dysfunctional and Inverted Celebrations in John Okada’s No-No Boy. In: Revue Française d'Etudes Américaines, N°53, août 1992. Séquelles de guerres. pp. 233-244

Toyo Suyemoto and James R. Bailey

Photograph of Toyo Suyemoto and James R. Bailey (Professor of English at Otterbein University) in front of Toyo's Orchard Lane apartment.Inscription on back of photograph: Toyo & Jim Bailey Taken by Stan Yogi.Photo taken by Stan Yogi in summertime.Undated, 1985-1996