About

Welcome to my new blog! Well, I already have a blog, but it's more of a personal/general one. I felt that some of what I wanted to post would be far too detailed or technical for that blog... Hence this new one ☺

You might be curious about the name, Julian's Polymath Explorations.

Polymath (also an adjective): a person of varied learning in several fields of study.

Anyone who knows me, knows that the above word "describes me to a T"... Ever since 4th grade!

My formal training – mostly from undergraduate & graduate school at UC Berkeley – spans Math, Computer Science, Molecular/Cell Biology, Chemistry and Physics. But my interests range far and wide.

One of my main research areas is in Theoretical Neuroscience / Neuro Computing, which straddles biology, math and computer science - a sweet spot where several of my interests overlap!

I'm also very interested in Knowledge Representation, and am quite active in Brain Annex, which is being formed as a non-profit organization offering tools for Knowledge and Media Management, soon to be released as open source.

A more recent area of active research for me has been Interactomics/Computational systems biology, which I introduce in this blog entry, in particular in the context of Biomedical Longevity research; I'm quite interested in quantitative modeling of Eukaryote organelles and whole-cell Prokaryotes.

A Big Love of mine has always been Physics, especially its foundations - and the Big Questions about Cosmology, the fabric of spacetime and the nature of existence and of consciousness.

Other interests of mine include Quantum Computing, and the control of chaotic systems.

I currently work at the pharmaceutical company GSK, after a tenure as the CTO of a biomedical company in the Longevity field.

Well, topics big and small will percolate into this new blog, and I hope you will enjoy some of the entries… Thoughtful comments always appreciated!

I may be reached on LinkedIn.

This blog is dedicated to the memory of professor Jacob T. Schwartz, my mentor at New York University, where I started college. Definitely a polymath himself, he was a Great Man of immense intellect and remarkable generosity.
Among other things, he gifted to the world SETL, the computer language - far ahead of its times - that later inspired Python. Blog entry about him.

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Discussing Neuroscience with ChatGPT

UPDATED Apr. 2023 - I'm excited by ChatGPT 's possibilities in terms of facilitating advanced learning . For example, I got enlightening answers to questions that I had confronted when I first studied neuroscience. The examples below are taken from a very recent session I had with ChatGPT (mid Jan. 2023.) Source: https://neurosciencestuff.tumblr.com In case you're not familiar with ChatGPT, it's a very sophisticated "chatbot" - though, if you call it that way, it'll correct you! 'I am not a "chatbot", I am a language model, a sophisticated type of AI algorithm trained on vast amounts of text data to generate human-like text'. For a high-level explanation of how ChatGPT actually works - which also gives immense insight into its weaknesses, there's an excellent late Jan. 2023 talk by Stephen Wolfram, the brilliant author of the Mathematica software and of Wolfram Alpha , a product that could be combined with ChatGPT to imp

Using Neo4j with Python : the Open-Source Library "NeoAccess"

So, you want to build a python app or Jupyter notebook to utilize Neo4j, but aren't too keen on coding a lot of string manipulation to programmatic create ad-hoc Cypher queries? You're in the right place: the NeoAccess library can do take care of all that, sparing you from lengthy, error-prone development that requires substantial graph-database and software-development expertise! This article is part 4 of a growing, ongoing series on Graph Databases and Neo4j "NeoAccess" is the bottom layer of the technology stack provided by the BrainAnnex open-source project . All layers are very modular, and the NeoAccess library may also be used by itself , entirely separately from the rest of the technology stack. (A diagram of the full stack is shown later in this article.) NeoAccess interacts with the Neo4j Python driver , which is provided by the Neo4j company, to access the database from Python; the API to access that driver is very powerful, but complex - and does

Graph Databases (Neo4j) - a revolution in modeling the real world!

UPDATED Oct. 2023 - I was "married" to Relational Databases for many years... and it was a good "relationship" full of love and productivity - but SOMETHING WAS MISSING! Let me backtrack. In college, I got a hint of the "pre-relational database" days... Mercifully, that was largely before my time, but - primarily through a class - I got a taste of what the world was like before relational databases. It's an understatement to say: YUCK! Gratitude for the power and convenience of Relational Databases and SQL - and relief at having narrowly averted life before it! - made me an instant mega-fan of that technology. And for many years I held various jobs that, directly or indirectly, made use of MySQL and other relational databases - whether as a Database Administrator, Full-Stack Developer, Data Scientist, CTO or various other roles. UPDATE: This article is now part 1 of a growing, ongoing series on Graph Databases and Neo4j But ther

What are Graph Databases - and Why Should I Care?? : "Graph Databases for Poets"

This is a very gentle introduction to the subject. The subtitle is inspired by university courses such as "Physics for Poets"! (if you're technically inclined, there's an alternate article for you.) It has been said that "The language of physics (or of God) is math". On a similar note, it could be said that: The language of the biological world - or of any subject or endeavor involving complexity - is networks ('meshes') What is a network? Think of it as the familiar 'friends of friends' diagram from social media. Everywhere one turns in biology, there's a network – at the cellular level, tissue level, organ level, ecosystem level. The weather and other earth systems are networks. Human societal organization is a network. Electrical circuits, the Internet, our own brains... Networks are everywhere! What can we do with networks, to better understand the world around us, or to create something that we need? Broadly s

Full-Text Search with the Neo4j Graph Database

(UPDATED Oct. 2023) Now that we have discussed a full technology stack based on Neo4j (or other graph databases), and that we a design and implementation available from the open-source project BrainAnnex.org , what next? What shall we build on top? Well, how about Full-Text Search ? This article is part of a growing, ongoing series on Graph Databases and Neo4j Full-Text Searching/Indexing Starting with the Version 5, Beta 26.1 release, the Brain Annex open-source project includes a straightforward but working implementation of a design that uses the convenient services of its Schema Layer , to provide indexing of word-based documents using Neo4j. The python class FullTextIndexing ( source code ) provides the necessary methods, and it can parse both plain-text and HTML documents (for example, used in "formatted notes"); parsing of PDF files and other formats will be added at a later date. No grammatical analysis ( stemming or lemmatizing ) is done on

Using Schema in Graph Databases such as Neo4j

UPDATED Feb. 2024 - Graph databases have an easygoing laissez-faire attitude: "express yourself (almost) however you want"... By contrast, relational databases come across with an attitude like a micro-manager: "my way or the highway"... Is there a way to take the best of both worlds and distance oneself from their respective excesses, as best suited for one's needs? A way to marry the flexibility of Graph Databases and the discipline of Relational Databases? This article is part 5 of a growing, ongoing series on Graph Databases and Neo4j Let's Get Concrete Consider a simple scenario with scientific data such as the Sample, Experiment, Study, Run Result , where Samples are used in Experiments, and where Experiments are part of Studies and produce Run Results. That’s all very easy and intuitive to represent and store in a Labeled Graph Database such as Neo4j . For example, a rough draft might go like this: The “labels” (black tags) represent

Neo4j & Cypher Tutorial : Getting Started with a Graph Database and its Query Language

You have a general idea of what Graph Databases - and Neo4j in particular - are... But how to get started? Read on! This article is part 3 of a growing, ongoing series on Graph Databases and Neo4j If you're new to graph databases, please check out part 1 for an intro and motivation about them. There, we discussed an example about an extremely simple database involving actors, movies and directors... and saw how easy the Cypher query language makes it to answer questions such as "which directors have worked with Tom Hanks in 2016" - questions that, when done with relational databases and SQL, turn into a monster of a query and an overly-complicated data model involving a whopping 5 tables! In this tutorial, we will actually carry out that query - and get acquainted with Cypher and the Neo4j browser interface in the process. This is the dataset we'll be constructing: Get the database in place If you don't already have a database installed locally

Neo4j Sandbox Tutorial : try Neo4j and learn Cypher - free and easy!

So, you have an itch to test-drive Neo4j and its Cypher query language. Maybe you want to learn it, or evaluate it, or introduce colleagues/clients to it. And you wish for: fast, simple and free! Well, good news: the Neo4j company kindly provides a free, short-term hosted solution called "the Neo4j sandbox" . Extremely easy to set up and use! This article is part 2 of a growing, ongoing series on Graph Databases and Neo4j Register (free) for the Neo4j "Sandbox" Go to sandbox.neo4j.com , and register with a working email and a password. That's it! Note that this same email/password will also let you into the Neo4j Community Forums and Support ; the same login for all: very convenient! Launch your instance - blank or pre-populated After registering, go to sandbox.neo4j.com , and follow the steps in the diagram below (the choices might differ, but the "Blank Sandbox" should always be there): Too good to be true? Is there

Visualization of Graph Databases Using Cytoscape.js

(UPDATED APR. 2024) I have ample evidence from multiple sources that there are strong unmet needs in the area of visualization of graph databases. And whenever there's a vacuum, vendors circle like vultures - with incomplete, non-customizable, and at times ridiculously expensive, closed-box proprietary solutions. Fortunately, coming to the rescue is the awesome open-source cytoscape.js library , an offshoot of the "Cytoscape" project of the Institute for Systems Biology , a project with a long history that goes back to 2002. One can do amazing custom solutions, relatively easily, when one combines this Cytoscape library with: 1) a front-end framework such as Vue.js 2) backend libraries (for example in python) to prepare and serve the data For example, a while back I created a visualizer for networks of chemical reactions, for another open-source project I lead ( life123.science ) This visualizer will look and feel generally familiar to anyone who has eve

To Build or Not to Build One’s Own Desktop Computer?

“ VALENTINA ” [UPDATED JUNE 2021] - Whether you're a hobbyist, or someone who just needs a good desktop computer, or an IT professional who wants a wider breath of knowledge, or a gamer who needs a performant machine, you might have contemplated at some point whether to build your own desktop computer. If you're a hobbyist, I think it's a great project. If you're an IT professional - especially a "coder" - I urge you to do it: in my opinion, a full-fledged Computer Scientist absolutely needs breath, ranging from the likes of Shannon's Information Theory and the Halting Problem - all the way down to how transistors work. And what about someone who just needs a good desktop computer? A big maybe on that - but perhaps this blog entry will either help you, or scare you off for your own good! To build, or not to build, that is the question: Whether 'tis nobler in the mind to suffer The slings and arrows of OEM's cutting corners and limit

Julian's Polymath Explorations

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