31 research outputs found
Portrait of George M. Dutcher
No full textSigned portrait of author George M. Dutcher.From Disinthralled: a story of my life by George M. Dutcher, published by Columbian Book Co. in 1874
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Identifying Program Entropy Characteristics with Symbolic Execution
No full textThe security infrastructure underpinning our society relies on encryption, which relies on the correct generation and use of pseudorandom data. Unfortunately, random data is deceptively hard to generate. Implementation problems in PRNGs and the incorrect usage of generated random data in cryptographic algorithms have led to many issues, including the infamous Debian OpenSSL bug, which exposed millions of systems on the internet to potential compromise due to a mistake that limited the source of randomness during key generation to have 2^15 different seeds (i.e. 15 bits of entropy).It is important to automatically identify if a given program applies a certain cryptographic algorithm or uses its random data correctly.This paper tackles the very first step of this problem by extracting an understanding of how a binary program generates or uses randomness. Specifically, we set the following problem: given a program (or a specific function), can we estimate bounds on the amount of randomness present in the program or function's output by determining bounds on the entropy of this output data? Our technique estimates upper bounds on the entropy of program output through a process of expression reinterpretation and stochastic probability estimation, related to abstract interpretation and model counting
Current drought conditions and scenarios for this winter
No full textPresented at the Central Plains irrigation conference on February 17-18, 2004 in Kearney Nebraska
Disinthralled [electronic resource] : a story of my life:a vivid portrayal of the evils of intemperance as exemplified in the author's own remarkable career together with many interesting reminiscences of his six year's experience as a worker in the temperance field / by George M. Dutcher.
No full textIncreasing stability for the conductivity and attenuation coefficients
No full textClick on the DOI link to access the article (may not be free).In this work we consider stability of recovery of the conductivity and attenuation coefficients of the stationary Maxwell and Schrodinger equations from a complete set of (Cauchy) boundary data. By using complex geometrical optics solutions we derive some bounds which can be viewed as an evidence of increasing stability in these inverse problems when the frequency is growing.The research of this author was supported by the Emylou Keith and Betty Dutcher Distinguished Professorship and the NSF grants DMS 10-08902 and DMS 15-14886.
The research of this author was supported in part by the NSF.
The research of this author was supported in part by the MOST 102-2115-M-002-009-MY3
Increasing stability for determining the potential in the Schrodinger equation with attenuation from the Dirichlet-to-Neumann map
No full textClick on the DOI link to access the article (may not be free).We derive some bounds which can be viewed as an evidence of increasing stability in the problem of recovering the potential coefficient in the Schrodinger equation from the Dirichlet-to-Neumann map in the presence of attenuation, when energy level/frequency is growing. These bounds hold under certain a-priori regularity constraints on the unknown coefficient. Proofs use complex and bounded complex geometrical optics solutions.Emylou Keith and Betty Dutcher Distinguished Professorship and the NSF grant DMS 10-08902. The second author is partially supported by the National Science Council of Taiwan
Fundamental science and discoveries at the interface of microbiology and physics
No full textI describe my research collaboration with Terry Beveridge, which resulted in both fundamental science and discoveries.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
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No full textThe role of the primary cilium in key signaling pathways depends on dynamic regulation of ciliary membrane protein composition, yet we know little about the motors or membrane events that regulate ciliary membrane protein trafficking in existing organelles. Recently, we showed that cilium-generated signaling in Chlamydomonas induced rapid, anterograde IFT-independent, cytoplasmic microtubule-dependent redistribution of the membrane polypeptide, SAG1-C65, from the plasma membrane to the periciliary region and the ciliary membrane. Here, we report that the retrograde IFT motor, cytoplasmic dynein 1b, is required in the cytoplasm for this rapid redistribution. Furthermore, signaling-induced trafficking of SAG1-C65 into cilia is unidirectional and the entire complement of cellular SAG1-C65 is shed during signaling and can be recovered in the form of ciliary ectosomes that retain signal-inducing activity. Thus, during signaling, cells regulate ciliary membrane protein composition through cytoplasmic action of the retrograde IFT motor and shedding of ciliary ectosomes
Attitudes and Practices of Clergy Members in Rural and Urban Areas
No full textAs mental health professionals become increasingly aware of the importance of religious values to clients there should be attempts not only to incorporate religion therapeutically but also to develop effective alliances with religious experts, in particular, members of the clergy. Since clergy are often on the frontlines of mental health issues, further research regarding referral patterns and collaboration is necessary. Clergy may be especially important in mental health care for rural communities where there is often a lack of adequate mental health resources and limited education surrounding mental health problems. The purpose of this study encompassed several different objectives. First, this study attempted to recognize attitudes that clergy possess about psychologists and other mental health professionals and explore how these attitudes influence referral patterns. Secondly, this research sought to understand how the nature of relationship between clergy members and mental health professionals affected referral patterns. Finally, this research aimed to analyze and compare attitudes and practices of clergy in rural and urban areas to determine specific similarities and differences. A questionnaire was developed by the author and committee members, based on a review of prior research in the area of psychologist-clergy collaboration. The questionnaire consisted of demographic information and Likert-style questions inquiring about attitudes and perceptions of clergy members relating to mental health professionals. Four-hundred randomly selected clergy members were invited to serve as participants. Clergy members were mailed a survey packet that included a cover letter explaining the purpose of the study, a questionnaire, a self-addressed stamped envelope, and a postcard that would enter participants in a drawing to win $50. Participants were also given an opportunity to complete the survey online and the URL was provided in the cover letter. A follow up postcard reminder was sent to participants three weeks after the original letter and survey. Seventy-one respondents returned the survey. The sample consisted of mainly highly educated, Caucasian males. 24% of urban respondents were female while 10% of rural respondents were female. The average age of participants was 52. Twenty-one different denominations were reported. 39% of respondents reported that they had received training in pastoral counseling, 30% had attended seminars in mental health counseling, 11 % reported no formal training, and 7% reported having a bachelors degree in psychology or a related field. No significant differences were found with regard to trust of Christian/non-Christian mental health professionals or cost of services. 19% of participants agreed that they trusted nonChristian mental health professionals to provide appropriate psychological services while 54% of participants agreed that they trusted Christian mental health professionals to provide these services. The study also aimed to asses whether clergy would be more willing to refer to mental health professionals based on variables such as: nature of relationship, similar belief systems, and level of trust within the relationship. Findings were consistent across rural and urban areas and no significant differences between areas were observed. Many respondents reported that they would refer if they believed the problem was of severe psychological nature. Several participants reported that they would refer because they do not have appropriate training in mental health issues. Reasons that pastors would not refer included lack of trust of mental health professionals. Also, many respondents reported that if the issue was spiritual rather than psychological in nature they would not refer. Recent research has identified various factors involved in enhancing or hindering collaboration between clergy in psychologists. However, research has not specifically addressed patterns of collaboration in rural versus urban areas. This study attempted to target these specific variables and add to the literature, thereby increasing awareness regarding these factors
Linearized inverse Schrödinger potential problem at a large wavenumber
No full textClick on the DOI link to access the article (may not be free).We investigate recovery of the (Schrodinger) potential function from many boundary measurements at a large wavenumber. By considering such a linearized form, we obtain a Holder type stability which is a big improvement over a logarithmic stability in low wavenumbers. Furthermore we extend the discussion to the linearized inverse Schrodinger potential problem with attenuation, where an exponential dependence of the attenuation constant is traced in the stability estimate. Based on the linearized problem, a reconstruction algorithm is proposed aiming at the recovery of the Fourier modes of the potential function. By choosing the large wavenumber appropriately, we verify the efficiency of the proposed algorithm by several numerical examples.Emylou Keith and Betty Dutcher Distinguished Professorship and the NSF grant DMS 15-14886. The work of the second author was supported by NSFC 11925104 and by the Shanghai Municipal Education Commission 16SG01. The work of the third author was supported by NSFC 11801351 and by the Shanghai Pujiang Program 18PJ1403600
