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University Place, WA, United States

Roche N.J.-H.,George Washington University | Buchner S.P.,U.S. Navy | Foster C.C.,University Place | King M.P.,Vanderbilt University | And 13 more authors.
IEEE Transactions on Nuclear Science | Year: 2014

The Variable Depth Bragg Peak method has been investigated for single event latchup testing by comparing latchup cross sections for heavy ions at low and high energies and by pulse height analysis. Results show that, unlike for an SOI device previously tested, where the charge collection depth is very small (70 nm), the comparison is not straightforward for latchup because of the large charge collection volumes involved. The variation in LET with depth for lower-energy ions greatly affects the comparison, but, if a charge collection depth of 50μm is assumed and the LET is averaged over that distance, the comparison improves significantly. © 1963-2012 IEEE.

Morris R.D.,University of California at Santa Cruz | Foster C.C.,University Place
IEEE Transactions on Nuclear Science | Year: 2011

Recently, errors in dosimetry have become of renewed interest , , together with their effect on the accuracy of estimating on-orbit upset rates. In those studies, the focus was on zero mean errors in the dosimetrythe dosimetry for runs with different ions was assumed to be measured with error, but that these errors were zero mean. There is anecdotal evidence, however, that the errors in dosimetry may not be zero mean. From a single set of tests it is impossible to estimate the magnitude of this non zero-mean effect. From multiple tests of the same part, it is possible if it is assumed that the true cross-section of the part does not change, and that the fluctuations around the common non zero mean are independent. We show non zero-mean errors in dosimetry of between 10 and 30% in data sets that were not collected specifically for this study. The presence of non zero-mean errors can have a large effect on the uncertainty in the experimental determination of a part's cross-section. When estimating upset rates for a device, users of experimental test data must use their best judgement as to the magnitude of the non zero-mean error that may be present. © 2011 IEEE.

Kim J.,University Place | Maan H.S.,University of Rochester | Cool A.J.,Advanced Dermatology | Hanlon A.M.,Yale University | Leffell D.J.,Yale University
Journal of Clinical and Aesthetic Dermatology | Year: 2015

Background: Cyanoacrylate topical adhesives and fast absorbing gut sutures are increasingly utilized by dermatologic surgeons as they provide satisfactory surgical outcomes while eliminating an additional patient visit for suture removal. To date, no head-to-head studies have compared the wound healing characteristics of these epidermal closure techniques in the repair of facial wounds after Mohs micrographic surgery. Objective: To compare the cosmetic outcome of epidermal closure by cyanoacrylate topical adhesive with fast absorbing gut suture in linear repairs of the face following Mohs micrographic surgery. Methods: Fourteen patients with wound length greater than 3cm who underwent Mohs micrographic surgery for nonmelanoma skin cancer of the face were enrolled in this randomized right-left comparative study. Following placement of dermal sutures, half of the wound was randomly selected for closure with cyanoacrylate and the contralateral side with fast absorbing gut suture. Using photographs from the three-month postoperative visit, six blinded individuals rated the overall cosmetic outcome. Results: The present study shows no significant difference in cosmetic outcomes between cyanoacrylate and fast absorbing gut suture for closure of linear facial wounds resulting from Mohs micrographic surgery. Cyanoacrylate tissue adhesive may not be as effective in achieving optimal cosmesis for wounds on the forehead or of longer repair lengths. The majority of patients did not have a preference for wound closure techniques, but when a preference was given, cyanoacrylate was significantly favored over sutures. Conclusion: Cyanoacrylate tissue adhesive and fast absorbing gut suture both result in comparable aesthetic outcomes for epidermal closure of linear facial wounds following Mohs micrographic surgery. Consideration should be given to factors such as need for eversion, hemostasis, and wound tension when selecting an epidermal wound closure method.

Foster C.C.,University Place | O'Neill P.M.,NASA | Reddell B.D.,NASA | Nguyen K.V.,Jacobs Engineering | And 4 more authors.
IEEE Transactions on Nuclear Science | Year: 2012

The Variable Depth Bragg Peak (VDBP) method uses long-range high-energy heavy ions to measure the Single Event Effect (SEE) cross-section as a function of linear energy transfer (LET(Si)) for commercially packaged integrated circuits with sensitive volumes at unknown depths. This is done by lowering the energy of the ions incident on the device-under-test (DUT) in steps, by insertion of polyethylene degraders of increasing thickness, until the maximum event cross-section is observed, which indicates that ions with the highest average LET(Si) (at the peak of the Bragg Peak) are depositing energy in the sensitive volume. The present paper describes use of the VDBP method to test for single event latchup (SEL) in packaged parts that do and do not fail catastrophically and to certify a device by assuring that every depth in the packaged device is exposed to a fluence of ions with average LET(Si) values greater than a specified value, in this case 60 MeV/mg/cm2. © 1963-2012 IEEE.

Schade V.L.,University Place | Harsha W.,U.S. Army | Rodman C.,Adult Family Nurse Practitioner | Roukis T.S.,The American College
Journal of Foot and Ankle Surgery | Year: 2016

Septic peroneal tenosynovitis is a rare and significant challenge. A search of peer-reviewed published studies revealed only 5 case reports to guide treatment, none of which resulted in significant loss of both peroneal tendons necessitating reconstruction. No clear guidance is available regarding how to provide reliable reconstruction of both peroneal tendons after a significant loss secondary to septic tenosynovitis. In the present report, we describe the case of a young, active-duty soldier who underwent lateral ankle ligament reconstruction with a tendon allograft whose postoperative course was complicated by septic peroneal tenosynovitis resulting in significant loss of both peroneal tendons. Reconstruction was achieved in a staged fashion with the use of silicone rods and external fixation to maintain physiologic tension and preserve peroneal tendon function, followed by reconstruction of both peroneal tendons and the superior peroneal retinaculum with a tensor fascia lata autograft. Soft tissue coverage was obtained with an anterolateral thigh free tissue transfer and a split-thickness skin graft. The patient returned to full activity as an active-duty soldier with minimal pain and no instability of the right lower extremity. The muscle strength of both peroneal tendons remained at 5 of 5, and no objective findings of ankle instability were seen at 3.5 years postoperatively. © 2016.

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