brozek/website
1
0
Fork 0
mirror of https://github.com/Brandon-Rozek/website.git synced 2024-11-09 10:40:34 -05:00
Code Issues Projects Releases Packages Wiki Activity

Added medium syndication metadata

Browse source
This commit is contained in:
Brandon Rozek 2023-02-18 21:37:22 -05:00
parent a51e20fbc7
commit a22bb998cb
14 changed files with 78 additions and 68 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
content/blog/antenna-basics.md
View file

@ -1,11 +1,14 @@
--- ---
title: "Antenna Basics" date: 2021-07-25 14:43:11
date: 2021-07-25T10:43:11-04:00
draft: false draft: false
tags: ["Amateur Radio"]
math: false math: false
medium_enabled: true medium_enabled: true
medium_post_id: fdec15d43776
tags:
- Amateur Radio
title: Antenna Basics
--- ---
When a radio wave hits an antenna, the electrical component of the wave induces a difference of potential in the conductor which gives rise to an electric current. This is called electromotive force. The current induced is normally small, therefore, we usually design antennas to be as efficient as possible. When a radio wave hits an antenna, the electrical component of the wave induces a difference of potential in the conductor which gives rise to an electric current. This is called electromotive force. The current induced is normally small, therefore, we usually design antennas to be as efficient as possible.
Ways to increase efficiency: Ways to increase efficiency:
@ -14,5 +17,4 @@ Ways to increase efficiency:
- If there is a power line nearby, run the antenna at a right angle to that wire to decrease interference. - If there is a power line nearby, run the antenna at a right angle to that wire to decrease interference.
- Make the antenna resonant at the frequency you're interested in. You can do this by adjusting the length of the wire, inductance, capacitance. - Make the antenna resonant at the frequency you're interested in. You can do this by adjusting the length of the wire, inductance, capacitance.
- Design the antenna so that it focuses the energy from the direction you care about, as opposed to listening equally in all directions. - Design the antenna so that it focuses the energy from the direction you care about, as opposed to listening equally in all directions.
- Similarly, raise the antenna higher off the ground so that more of it's beam pattern reaches the horizon. - Similarly, raise the antenna higher off the ground so that more of it's beam pattern reaches the horizon.

9
content/blog/comparatorlogicgate.md
View file

@ -1,10 +1,11 @@
--- ---
title: "Comparator Logic Gate" date: 2021-06-18 05:09:45
date: 2021-06-18T01:09:45-04:00
draft: false draft: false
tags: []
math: true math: true
medium_enabled: true medium_enabled: true
medium_post_id: 7bbc125ead40
tags: []
title: Comparator Logic Gate
--- ---
This post is heavily derived from the Wikipedia post on [Digital Comparators](https://en.wikipedia.org/wiki/Digital_comparator) and therefore can be distributed under the Creative Commons Attribution-ShareAlike 3.0 license. This post is heavily derived from the Wikipedia post on [Digital Comparators](https://en.wikipedia.org/wiki/Digital_comparator) and therefore can be distributed under the Creative Commons Attribution-ShareAlike 3.0 license.
@ -52,4 +53,4 @@ The only way for this to evaluate to true is if A is 1 and B is 0. That is $(A >
To compare an entire bitstring, we start from the most significant bit and check to see if one bit is greater than the other. If not, it will then check the next bit while confirming that all the previous bits were the same. For a 3-bit comparator, the logic will look like the following: To compare an entire bitstring, we start from the most significant bit and check to see if one bit is greater than the other. If not, it will then check the next bit while confirming that all the previous bits were the same. For a 3-bit comparator, the logic will look like the following:
$$ $$
(A_3A_2A_1 > B_3 B_2 B_1) \equiv A_3\bar{B_3} + \overline{(A_3 \oplus B_3)}A_2\bar{B_2} + \overline{(A_3 \oplus B_3)}\overline{(A_2 \oplus B_2)}A_1\bar{B_1} (A_3A_2A_1 > B_3 B_2 B_1) \equiv A_3\bar{B_3} + \overline{(A_3 \oplus B_3)}A_2\bar{B_2} + \overline{(A_3 \oplus B_3)}\overline{(A_2 \oplus B_2)}A_1\bar{B_1}
$$ $$

10
content/blog/convert-djvu-to-pdf.md
View file

@ -1,10 +1,11 @@
--- ---
title: "Convert DJVU to PDF" date: 2021-08-28 02:00:00
date: 2021-08-27T22:00:00-04:00
draft: false draft: false
tags: []
math: false math: false
medium_enabled: true medium_enabled: true
medium_post_id: ddf23ae64f9a
tags: []
title: Convert DJVU to PDF
--- ---
I've recently come across the DJVU file format before and needed to convert it to a PDF. The most reliable way I've found to do it is via the following command. I've recently come across the DJVU file format before and needed to convert it to a PDF. The most reliable way I've found to do it is via the following command.
@ -42,5 +43,4 @@ if ! command -v ps2pdf > /dev/null ; then
fi fi
djvups "$1" | ps2pdf - "${1%.*}.pdf" djvups "$1" | ps2pdf - "${1%.*}.pdf"
``` ```

11
content/blog/do-while-other-lang.md
View file

@ -1,10 +1,11 @@
--- ---
title: "Do-While Loop in Other Languages" date: 2021-08-28 01:50:02
date: 2021-08-27T21:50:02-04:00
draft: false draft: false
tags: []
math: false math: false
medium_enabled: true medium_enabled: true
medium_post_id: 5a9c792673f2
tags: []
title: Do-While Loop in Other Languages
--- ---
Some languages like C, C++, and Java have a concept of a Do-While loop which normally look like the following: Some languages like C, C++, and Java have a concept of a Do-While loop which normally look like the following:
@ -22,6 +23,4 @@ first_run = True
while condition or first_run: while condition or first_run:
first_run = False first_run = False
statements statements
``` ```

12
content/blog/introrfpoweramp.md
View file

@ -1,10 +1,12 @@
--- ---
title: "Introduction to RF Power Amplifiers" date: 2021-04-10 17:01:00
date: 2021-04-10T13:01:00-04:00
draft: false draft: false
tags: ["Amateur Radio"]
math: true math: true
medium_enabled: true medium_enabled: true
medium_post_id: a8510ebe7754
tags:
- Amateur Radio
title: Introduction to RF Power Amplifiers
--- ---
For field day I've been toying with the idea of buying a power amplifier for my HackRF. What I've come to realize is that there are a lot more to power amplifiers than just how much it amplifies by. This post outlines my current understanding (I'm by no means an expert) on the subject of RF power amplifiers. For field day I've been toying with the idea of buying a power amplifier for my HackRF. What I've come to realize is that there are a lot more to power amplifiers than just how much it amplifies by. This post outlines my current understanding (I'm by no means an expert) on the subject of RF power amplifiers.
@ -60,6 +62,4 @@ Considerations:
- Need a gain of 30dB - Need a gain of 30dB
- Lower noise figure is always better but a link budget analysis would get you a specific number. - Lower noise figure is always better but a link budget analysis would get you a specific number.
- Want VSWR as close to 1 as possible. - Want VSWR as close to 1 as possible.

10
content/blog/leantactics.md
View file

@ -1,10 +1,12 @@
--- ---
title: "Lean Theorem Prover Tactics" date: 2021-10-11 03:52:41
date: 2021-10-10T23:52:41-04:00
draft: false draft: false
tags: ["Formal Methods"]
math: false math: false
medium_enabled: true medium_enabled: true
medium_post_id: adea1a69ddc8
tags:
- Formal Methods
title: Lean Theorem Prover Tactics
--- ---
I've recently been playing with the Lean Theorem Prover. I am impressed with how some of the mathematics community decided to extend this project via [mathlib](https://leanprover-community.github.io/) and really make proving theorems in this framework easy and enjoyable. I've recently been playing with the Lean Theorem Prover. I am impressed with how some of the mathematics community decided to extend this project via [mathlib](https://leanprover-community.github.io/) and really make proving theorems in this framework easy and enjoyable.
@ -284,4 +286,4 @@ end
Documentation: https://leanprover-community.github.io/mathlib_docs/tactics.html#linarith Documentation: https://leanprover-community.github.io/mathlib_docs/tactics.html#linarith
## Conclusion ## Conclusion
A common pattern of writing proofs for me is to use a combination of `hint` and `have` with `library_search`. Especially when you are not an expert in a theorem prover, it's nice to have the system fill in some of the simpler steps. I generally prefer tactics that give you a list of simpler tactics back as opposed to solving the goal in the background without any proof. Regardless, I'm glad that many of these decision procedures exist to help me deal with what can sometimes be the verbosity of theorem proving. A common pattern of writing proofs for me is to use a combination of `hint` and `have` with `library_search`. Especially when you are not an expert in a theorem prover, it's nice to have the system fill in some of the simpler steps. I generally prefer tactics that give you a list of simpler tactics back as opposed to solving the goal in the background without any proof. Regardless, I'm glad that many of these decision procedures exist to help me deal with what can sometimes be the verbosity of theorem proving.

10
content/blog/netbootxyz.md
View file

@ -1,9 +1,10 @@
--- ---
title: "Netboot.xyz Bootloader" date: 2021-06-18 19:43:29
date: 2021-06-18T15:43:29-04:00
draft: false draft: false
tags: []
medium_enabled: true medium_enabled: true
medium_post_id: d99cafd95a34
tags: []
title: Netboot.xyz Bootloader
--- ---
Instead of manually loading ISOs onto a USB stick for [Ventoy](/blog/ventoy) to display, we can use Netboot.xyz to present us a list of options and download them during boot. This requires an internet connection in order to work. Instead of manually loading ISOs onto a USB stick for [Ventoy](/blog/ventoy) to display, we can use Netboot.xyz to present us a list of options and download them during boot. This requires an internet connection in order to work.
@ -14,5 +15,4 @@ Download the [Netboot ISO](https://boot.netboot.xyz/ipxe/netboot.xyz.iso) and [l
![](/files/images/blog/netboot.xyz.gif) ![](/files/images/blog/netboot.xyz.gif)
Another benefit of this approach over Ventoy is that we don't have to manually update the flash drive. It always comes fresh with the ISOs available on their website. Another benefit of this approach over Ventoy is that we don't have to manually update the flash drive. It always comes fresh with the ISOs available on their website.

11
content/blog/networkdebugging.md
View file

@ -1,10 +1,12 @@
--- ---
title: "Common Network Debugging Commands" date: 2022-01-02 20:17:02
date: 2022-01-02T15:17:02-05:00
draft: false draft: false
tags: ["Networking"]
math: false math: false
medium_enabled: true medium_enabled: true
medium_post_id: 7a55c1f5f40e
tags:
- Networking
title: Common Network Debugging Commands
--- ---
Below are list of commands that I use to debug common issues in a network. There is a wonderful tool called Wireshark which you can use to sniff packets in a network and filter by a wide range of options, but we'll mainly focus on simple tools that you can use in the terminal. Below are list of commands that I use to debug common issues in a network. There is a wonderful tool called Wireshark which you can use to sniff packets in a network and filter by a wide range of options, but we'll mainly focus on simple tools that you can use in the terminal.
@ -157,5 +159,4 @@ Address HWtype HWaddress Flags Mask Iface
192.168.0.1 ether 10:1d:b1:1d:1f:91 C wlan0 192.168.0.1 ether 10:1d:b1:1d:1f:91 C wlan0
192.168.0.11 ether 72:25:22:2c:72:72 C wlan0 192.168.0.11 ether 72:25:22:2c:72:72 C wlan0
192.168.0.111 ether 03:33:34:3b:23:39 C wlan0 192.168.0.111 ether 03:33:34:3b:23:39 C wlan0
``` ```

11
content/blog/parallel-scp.md
View file

@ -1,11 +1,13 @@
--- ---
title: "Parallel SCP with LFTP" date: 2021-07-25 14:38:43
date: 2021-07-25T10:38:43-04:00
draft: false draft: false
tags: []
math: false math: false
medium_enabled: true medium_enabled: true
medium_post_id: 610d337c8783
tags: []
title: Parallel SCP with LFTP
--- ---
Segmented file transfer allows you to split up a file into multiple chunks and download them in parallel. There is a program written for Linux called LFTP which can accomplish this task and supports FTP, HTTP, SFTP, BitTorrent, among others. The syntax is a little funky, so I wrote a wrapper I call `pget` which allows for segmented file transfers using SCP. Segmented file transfer allows you to split up a file into multiple chunks and download them in parallel. There is a program written for Linux called LFTP which can accomplish this task and supports FTP, HTTP, SFTP, BitTorrent, among others. The syntax is a little funky, so I wrote a wrapper I call `pget` which allows for segmented file transfers using SCP.
Usage: Usage:
@ -58,5 +60,4 @@ fi
LFTP_COMMAND="pget -n $NUM_SEGMENTS $FILE_LOCATION;bye" LFTP_COMMAND="pget -n $NUM_SEGMENTS $FILE_LOCATION;bye"
lftp -e "$LFTP_COMMAND" sftp://"$REMOTE_HOST" lftp -e "$LFTP_COMMAND" sftp://"$REMOTE_HOST"
``` ```

11
content/blog/printdebug.md
View file

@ -1,9 +1,11 @@
--- ---
title: "Print Statements with Frame Information" date: 2021-06-03 17:54:39
date: 2021-06-03T13:54:39-04:00
draft: false draft: false
tags: ["Testing"]
medium_enabled: true medium_enabled: true
medium_post_id: a811c52bda55
tags:
- Testing
title: Print Statements with Frame Information
--- ---
I find it extremely useful to include frame information such as filename, line number, and current function in my print statements. Here's a couple ways that I've done that in the past. I find it extremely useful to include frame information such as filename, line number, and current function in my print statements. Here's a couple ways that I've done that in the past.
@ -36,5 +38,4 @@ def debuglog(m):
lineno = last_frame_info.lineno if last_frame_info is not None else 1 lineno = last_frame_info.lineno if last_frame_info is not None else 1
function_name = last_frame_info.function if last_frame_info is not None else "<module>" function_name = last_frame_info.function if last_frame_info is not None else "<module>"
print(f"[{filename}:{lineno} {function_name}] {m}") print(f"[{filename}:{lineno} {function_name}] {m}")
``` ```

8
content/blog/socatforward.md
View file

@ -1,9 +1,11 @@
--- ---
title: "Forward Packets with Socat" date: 2021-06-18 23:38:43
date: 2021-06-18T19:38:43-04:00
draft: false draft: false
tags: ["Networking"]
medium_enabled: true medium_enabled: true
medium_post_id: 790558856bee
tags:
- Networking
title: Forward Packets with Socat
--- ---
I've written about relaying TCP traffic using [SSH port forwarding](/blog/sshlocalportforwarding/). Though sometimes you don't require the authenticity and encryption of SSH or want to use another protocol such as UDP. That's where `socat` comes in. I've written about relaying TCP traffic using [SSH port forwarding](/blog/sshlocalportforwarding/). Though sometimes you don't require the authenticity and encryption of SSH or want to use another protocol such as UDP. That's where `socat` comes in.

10
content/blog/terminaloutputvim.md
View file

@ -1,9 +1,10 @@
--- ---
title: "Terminal Output in Vim" date: 2021-06-18 20:22:30
date: 2021-06-18T16:22:30-04:00
draft: false draft: false
tags: []
medium_enabled: true medium_enabled: true
medium_post_id: fba948955d22
tags: []
title: Terminal Output in Vim
--- ---
In Vim you can output the result of a command below your cursor by using `:r!`. In Vim you can output the result of a command below your cursor by using `:r!`.
@ -22,5 +23,4 @@ The current timestamp
:r! echo "[$(date '+\%Y-\%m-\%d \%H:\%M:\%S')]" :r! echo "[$(date '+\%Y-\%m-\%d \%H:\%M:\%S')]"
``` ```
Outputs: `[2021-06-18 16:13:19]` Outputs: `[2021-06-18 16:13:19]`

11
content/blog/ventoy.md
View file

@ -1,9 +1,11 @@
--- ---
title: "Ventoy for managing ISOs on one USB" date: 2021-06-18 19:32:38
date: 2021-06-18T15:32:38-04:00
draft: false draft: false
tags: ["Virtualization"]
medium_enabled: true medium_enabled: true
medium_post_id: b096fed9be3c
tags:
- Virtualization
title: Ventoy for managing ISOs on one USB
--- ---
Traditionally I would hold one Linux distribution per USB drive. Though with 32 GB USB Flash drives only costing $12, why hold only one per drive? That's where Ventoy comes in. With Ventoy, we can store multiple ISOs which it then presents as a boot screen. Traditionally I would hold one Linux distribution per USB drive. Though with 32 GB USB Flash drives only costing $12, why hold only one per drive? That's where Ventoy comes in. With Ventoy, we can store multiple ISOs which it then presents as a boot screen.
@ -20,5 +22,4 @@ To install Ventoy onto a flash drive, follow the [Get Started](https://www.vento
![](/files/images/blog/ventoy.png) ![](/files/images/blog/ventoy.png)
Example screenshot from their website. Example screenshot from their website.

10
content/blog/z3constraintsolving.md
View file

@ -1,10 +1,11 @@
--- ---
title: "Z3 Constraint solving" date: 2021-06-18 04:53:20
date: 2021-06-18T00:53:20-04:00
draft: false draft: false
math: true math: true
tags: []
medium_enabled: true medium_enabled: true
medium_post_id: 9e4ced42d47
tags: []
title: Z3 Constraint solving
--- ---
I've been looking for an easy to use constraint solver for a while and recently I've landed on using the python bindings for the SMT solver Z3. I've been looking for an easy to use constraint solver for a while and recently I've landed on using the python bindings for the SMT solver Z3.
@ -43,5 +44,4 @@ s.check()
m = s.model() m = s.model()
x_val = m.eval(x) x_val = m.eval(x)
y_val = m.eval(y) y_val = m.eval(y)
``` ```