Tim Johnson

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Zhang, Xiaoxi, Johnson, Tim, Little, Roderick J.A.

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Johnson, Tim

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Zhang, Xiaoxi, Johnson, Tim, Little, Roderick J.A.

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Johnson, Tim

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Zhang, Xiaoxi, Johnson, Tim, Little, Roderick J.A.

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Johnson, Tim

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Zhang, Xiaoxi, Johnson, Tim, Little, Roderick J.A.

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

A Bayesian Image Analysis of the Change in Tumor/Brain Contrast Uptake Induced by Radiation via Reversible Jump Markov Chain Monte Carlo (2007)

Johnson, Tim

This work is motivated by a pilot study on the change in tumor/brain contrast uptake induced by radiation via quantitative Magnetic Resonance Imaging. The results inform the optimal timing of...

Detecting Pulsatile Hormone Secretion Events: A Bayesian Approach (2006)

Johnson, Tim

Many challenges arise in the analysis of pulsatile, or episodic, hormone concentration time series data. Among these challenges is the determination of the number and location of pulsatile events and...

Detecting Pulsatile Hormone Secretion Events: A Bayesian Approach (2006)

Johnson, Tim

Many challenges arise in the analysis of pulsatile, or episodic, hormone concentration time series data. Among these challenges is the determination of the number and location of pulsatile events and...

Detecting Pulsatile Hormone Secretion Events: A Bayesian Approach (2006)

Johnson, Tim

Many challenges arise in the analysis of pulsatile, or episodic, hormone concentration time series data. Among these challenges is the determination of the number and location of pulsatile events and...

Detecting Pulsatile Hormone Secretion Events: A Bayesian Approach (2006)

Johnson, Tim

Many challenges arise in the analysis of pulsatile, or episodic, hormone concentration time series data. Among these challenges is the determination of the number and location of pulsatile events and...

A Bayesian Mixture Model Relating Dose to Critical Organs and Functional Complication in 3D Conformal Radiation Therapy (2004)

Johnson, Tim, Taylor, Jeremy, Ten Haken, Randall K, Eisbruch, Avraham

A goal of radiation therapy is to deliver maximum dose to the target tumor while minimizing complications due to irradiation of critical organs. Technological advances in 3D conformal radiation...

A Bayesian Mixture Model Relating Dose to Critical Organs and Functional Complication in 3D Conformal Radiation Therapy (2004)

Johnson, Tim, Taylor, Jeremy, Ten Haken, Randall K, Eisbruch, Avraham

A goal of radiation therapy is to deliver maximum dose to the target tumor while minimizing complications due to irradiation of critical organs. Technological advances in 3D conformal radiation...

A Bayesian Mixture Model Relating Dose to Critical Organs and Functional Complication in 3D Conformal Radiation Therapy (2004)

Johnson, Tim, Taylor, Jeremy, Ten Haken, Randall K, Eisbruch, Avraham

A goal of radiation therapy is to deliver maximum dose to the target tumor while minimizing complications due to irradiation of critical organs. Technological advances in 3D conformal radiation...

A Bayesian Mixture Model Relating Dose to Critical Organs and Functional Complication in 3D Conformal Radiation Therapy (2004)

Johnson, Tim, Taylor, Jeremy, Ten Haken, Randall K, Eisbruch, Avraham

A goal of radiation therapy is to deliver maximum dose to the target tumor while minimizing complications due to irradiation of critical organs. Technological advances in 3D conformal radiation...

A Bayesian Hierarchical Approach to Multirater Correlated ROC Analysis (2004)

Johnson, Tim, Johnson, Valen

In a common ROC study design, several readers are asked to rate diagnostics of the same cases processed under different modalities. We describe a Bayesian hierarchical model that facilitates the...

A Bayesian Hierarchical Approach to Multirater Correlated ROC Analysis (2004)

Johnson, Tim, Johnson, Valen

In a common ROC study design, several readers are asked to rate diagnostics of the same cases processed under different modalities. We describe a Bayesian hierarchical model that facilitates the...

A Bayesian Hierarchical Approach to Multirater Correlated ROC Analysis (2004)

Johnson, Tim, Johnson, Valen

In a common ROC study design, several readers are asked to rate diagnostics of the same cases processed under different modalities. We describe a Bayesian hierarchical model that facilitates the...

A Bayesian Hierarchical Approach to Multirater Correlated ROC Analysis (2004)

Johnson, Tim, Johnson, Valen

In a common ROC study design, several readers are asked to rate diagnostics of the same cases processed under different modalities. We describe a Bayesian hierarchical model that facilitates the...

Digital Signal Processing Rapid Prototyping for Military Communication Systems. (1998)

Sivaprakasam, Srinivas, Neophytou, Christos, Prescott, Glenn, Johnson, Tim

This research effort dealt with developing a digital signal processing (DSP) radio rapid prototyping testbed. The idea was to integrate advanced computer-aided design CAD) communications software...

Hormiguitaz = Antz (1998)

Darnell, Eric, Johnson, Tim, Alcott, Todd (guión), Weitz, Paul (guión), Gregson-Williams, Harry (música), Powell, John (música)

Una hormiga obrero siente la necesidad de encajar su propia individualidad en la rígida ética de trabajo de la colonia. Enamorado de la princesa, y habiendo cambiado papeles con un amiguo guerrero,...

Hormiguitaz (1998)

Darnell, Eric, Johnson, Tim, Alcott, Todd (guión), Weitz, Paul (guión), Gregson-Williams, Harry (música), Powell, John (música)

Una hormiga obrero siente la necesidad de encajar su propia individualidad en la rígida ética de trabajo de la colonia. Enamorado de la princesa, y habiendo cambiado papeles con un amiguo guerrero,...

The magnitude of hedgehog signaling activity defines skin tumor phenotype

Grachtchouk, Vladimir, Grachtchouk, Marina, Lowe, Lori, Johnson, Tim, Wei, Lebing, Wang, Aiqin, ...

Gain-of-function mutations in SMO have been implicated in constitutive activation of the hedgehog signaling pathway in human basal cell carcinomas (BCCs). We used a truncated keratin 5 (ΔK5)...

The magnitude of hedgehog signaling activity defines skin tumor phenotype

Grachtchouk, Vladimir, Grachtchouk, Marina, Lowe, Lori, Johnson, Tim, Wei, Lebing, Wang, Aiqin, ...

Gain-of-function mutations in SMO have been implicated in constitutive activation of the hedgehog signaling pathway in human basal cell carcinomas (BCCs). We used a truncated keratin 5 (ΔK5)...

Insider Trading in Credit Derivatives

Acharya, Viral V, Johnson, Tim

Insider trading in the credit derivatives market has become a significant concern for regulators and participants. This paper attempts to quantify the problem. Using news reflected in the stock...

More Insiders, More Insider Trading: Evidence from Private Equity Buyouts

Acharya, Viral V, Johnson, Tim

Recent takeover activity has been characterized by broader participation in acquiror financing on both debt and equity sides. We focus on private equity buyouts, and investigate whether the number of...

Egalitarian Punishment in Humans

James H. Fowler, Tim Johnson, Richard McElreath, Oleg Smirnov

Participants in laboratory public goods games are often willing to decrease the earnings of others at a cost to themselves. What motivates this behaviour is unclear: in the conventional public goods...

Inequality Reduces Punishment-Induced Cooperation in Humans

James Fowler, Tim Johnson, Richard McElreath, Oleg Smirnov

Humans often cooperate, voluntarily paying an individual cost to supply a benefit to others. Public good experiments show that punishment induces a high level of cooperation, even when it is costly...

A Bayesian Hierarchical Approach to Multirater Correlated ROC Analysis

Tim Johnson, Valen Johnson

In a common ROC study design, several readers are asked to rate diagnostics of the same cases processed under different modalities. We describe a Bayesian hierarchical model that facilitates the...