An exploratory analysis of crime, particularly bike theft, in Denver between 2011-2016 was developed in R using data from the Open Data Catalog. Two interactive visualizations are presented: Denver Crime Map – selected categories of Denver crime since 2011 Denver Bike Theft Map – reported crimes classified as bicycle theft since 2011. Find the source code at https://github.com/pchuck/denver-crime
An exploratory analysis of cycling accidents in Denver between 2011-2016 was developed in R using data from the Open Data Catalog. Have a look at the detailed analysis denver-traffic (github) or interactive map Denver Traffic Accidents Involving Bicycles: 2011-2016 (shiny.io).
The ETF Leverage Simulator synthesizes long-term leveraged ETF returns. Leveraged ETF’s are exchanged traded funds that use derivatives and debt to magnify the returns of an underlying index. Such funds apply a leverage multiplier (typical 2x or 3x) to amplify an index’s actual returns on a daily basis. This application allows the user to select an underlying index and then run a simulation to see how an ETF (applying daily leverage to the underlying index) would have performed over the same period….
Presented at the inaugural session of the Reactive Programming Denver meetup. I spoke about concurrency, the importance of asynchronous and nonblocking in event-driven ‘reactive’ programming, and the differences between imperative and functional computer languages, particularly the scala language.
Background MongoDB has a nice guide for getting started with running mongoDB in EC2. This article presents some additional enhancements for increasing performance while lower storage costs in EC2. A subsequent installment presents techniques for deploying replica sets and auto-scaling nodes. AWS Storage Performance Many sources, including the MongoDB guide linked above, recommend using EBS-backed volumes. “For production systems we recommend using EBS-optimized EC2 instances.” EBS backed volumes indeed provide the convenience of data persistence across instance reboots….
I had the privilege of visiting Bangalore for two weeks. When I wasn’t working with my colleagues at their office in Manyata Park, had the opportunity to explore the city and make a day trip to Mysore. Bangalore is the capital of Karnataka and commercial hub of the Deccan (Karnataka and Andhra Pradesh states). According to National Geographic, the city is the “world’s third most important IT city… a more international city than even Mumbai.” Bangalore is indeed an amazing…
AOD255e The new Acer Aspire One AOD255E features intel’s new dual-core Atom n570. The n570 is the first n-series Atom chip to include hardware virtualization (or VT-x) extensions. Add dual cores with hyperthreading, and the system has the potential to perform more like a higher end notebook. Not bad for $329, but the system ships with only 1GB of RAM and a 250GB mechanical HD. SSD and RAM Upgrade To bring these components up to par with the processor, increase…
‘kaos’ is a fractal generator for Zaurus handhelds and other mobile devices featuring support for KVM or J2ME. Download java-net.ultrametrics.kaos.Kaos_1.0_arm.ipk
Summary jpcap is a set of Java classes which provide an interface and system for network packet capture. A protocol library and tool for visualizing network traffic is included. jpcap hides the low-level details of network packet capture by abstracting many network packet types and protocols into Java classes. Internally, jpcap implements bindings to the libpcap system library through JNI (the Java Native Interface). jpcap utilizes libpcap, a widely deployed shared-library for capturing user-level packets. libpcap must be installed on…
net.ultrametrics.palm.JChalkIR is a java ‘Spotlet’ for the experimental KJava virtual machine for handheld devices. Allows two or more people to collaborate on a simple sketch. source: sources_net.ultrametrics.palm-0.02.jar javadoc: javadoc_net.ultrametrics.palm-0.02.jar palm app: JChalkIR-v0_2.zip note: Application requires Sun’s KVM (Early Access version 0.1 [DR4] or newer). The SDDK and VM can be found on Sun’s JDC KVM page. If you are still using the Java One KVM [DR3 or older], try the old JChalkIR. Source and javadoc jar files provided are…