Posts tagged "project"

PeerDoc – Scaling real-time text editing

PeerDoc is a collaborative real-time rich-text editor with undo/redo, cursor tracking, inline comments, permissions/sharing control over documents, a change history. Things you would expect from a modern collaborative editor on the web.

But the main difference is that it combines two types of collaboration:

  • real-time collaboration between collaborators on the draft of the document (push-based collaboration)
  • fork and merge request style of collaboration with others, allowing collaboration to scale beyond a small group of collaborators (pull-based collaboration)

Keep reading

Towards Automatic Machine Learning Pipeline Design

I recently finished my PhD thesis and is now available online. Most of the code related to the thesis is available in this repository.

Keep reading

Reactive queries in PostgreSQL

I am a big fan of the application architecture promoted by Meteor. I like declarative programming. You describe what you want and not how and the system does the rest. Reactive programming is very similar. You define how outputs should be computed from inputs, but when is this computed and how it is composed with other computations is left to the system. So you can define what is read from the database and send to the client. And how it is read on the client and transformed and send to the UI library. And then UI library can render this data. And every time something changes, the rest gets automatically recomputed, refreshed, re-rendered.

Meteor is tightly linked with MongoDB. They developed a complex piece of technology to provide reactive queries. Reactive queries are queries which after providing initial results they also continue providing any changes to those results as input data used in queries change. While I like MongoDB, I still prefer consistency tools provided by traditional SQL databases: transactions, foreign keys, joins and triggers. They are close to declarative programming as well. You define relations between data once and then the system makes sure data is consistent. I had to implement many of those features on top of MongoDB, like my package PeerDB.

This is why I made reactive-postgres node.js package. It provides exactly such reactive queries, but for PostgreSQL open source database. Its API is simple, on purpose, and because it should be. You provide a query, you get initial data, and then you get all changes. Try it out.

Proof of luck consensus protocol and Luckychain blockchain

Proof of work consensus protocol used in modern cryptocurrencies like Bitcoin and Ethereum consumes a lot of energy and requires participants to use their CPUs for mining instead of other useful work. But exactly this cost is why it is works to prevent Sybil attacks. One cannot participate in the selection of the next block without paying this cost, which makes the issue of puppet participants trying to influence block selection irrelevant, because they also have to do the work, and pay the cost.

In recent Intel CPUs a new set of instructions is available, SGX, which allows one to run code inside a special environment where even operating system cannot change its execution. In the paper we published (arXiv, Cryptology ePrint Archive) we explore consensus protocol designs using the Intel SGX technology, with the goal of making blockchain participation energy efficient, with low CPU usage, and to democratize mining so that participants can participate again with their general purpose computers (with Intel CPUs) instead of only with specialized ASICs.

Keep reading

Presentation and release of nodewatcher 3.0

Presentation and release of nodewatcher 3.0 at Battlemesh v8. Nodewatcher is an open source network planning, deployment, monitoring and maintenance platform with emphasis on community. Version 3.0 is a complete rewrite bringing modularity and extensibility.

Meteor Blaze Components

Blaze Components for Meteor are a system for easily developing complex UI elements that need to be reused around your Meteor app. Live tutorial.

My presentation of PeerLibrary at OpenCon 2014

My presentation of PeerLibrary at OpenCon 2014, the student and early career researcher conference on Open Access, Open Education, and Open Data. Slides.

Etage – A general data-flow framework featuring nondeterminism, laziness and neurological pseudo-terminology

Etage is a data-flow based programming language. It is build upon Haskell and provides nondeterminism and laziness. It is text based and through few basic commands it allows defining operations (neurons) and connections between operations (nerves) along which data can flow. Moreover, program can form a network with loops and is not limited to only tree-like structure.

Keep reading

Recent Tweets @mitar_m