teleren/devto huggingface dataset:
Factors affecting the clarity of full-color LED display
Tags: brightness, resolution, led, displays
Published: 2023-08-25 07:12:17

With the rapid development of [LED displays](https://www.sostron.com/product?category=2), the popularization and application of LED large-screen products such as full-color LED displays and LED electronic displays has greatly promoted the rapid development of the industry, especially the application of full-color LED displays. 

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/je2vtxyx54j9svlbhn8l.png)
As we all know, full-color LED display is the main carrier of advertising and information broadcasting, so the clarity of full-color LED screen is very necessary, so what are the factors that affect the clarity of full-color LED screen?

Resolution: Resolution is the number of pixels of the LED display, usually expressed in terms of horizontal pixels and vertical pixels. Higher resolution screens can show more detail and are therefore usually sharper. [Teach you 8 ways to remove the moiré effect of the LED display. ](https://www.sostron.com/service/faq/5489)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qjowl1cy14m2iwtx1y5o.png)
Dot pitch: Reducing the dot pitch of the full-color LED display can improve its clarity. The smaller the dot pitch of the full-color LED display, the more delicate the picture will be displayed. However, for this point, there must be mature technology as the core support, and its input cost is relatively high, and the price of the full-color LED display produced is also high, but fortunately, the market is now developing towards small-pitch LED displays.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/8tjl2r4jykdktkbnem6q.png)
Pixel density: Pixel density refers to the number of pixels per inch, usually measured in PPI (pixels per inch). Higher pixel density results in sharper images, especially when viewed up close.

Brightness: Brightness is the intensity of the light emitted by the LED display. Higher brightness improves display visibility in bright environments, aiding clarity.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/xczgl20ksflfx90u0ni6.png)
Contrast: Contrast is the degree of difference between light and dark parts of an image. Higher contrast enhances image depth and clarity.

Gray Levels: Gray levels represent the number of different brightness levels an LED display can display. More levels of gray allow more colors and details to be displayed, improving clarity.

Taking these factors into consideration and selecting the appropriate LED display according to specific application scenarios and needs can ensure the best image quality and clarity.
Exciting News: LangChain Now Supports Memgraph!
Tags: langchain, memgraph, python
Published: 2023-08-25 07:06:32

We're thrilled to announce a powerful integration between LangChain and Memgraph, bringing you an unparalleled natural language interface to your Memgraph database. Say goodbye to complex queries and welcome a seamless and intuitive way to interact with your data.

## Memgraph QA chain tutorial

If you've ever wanted to effortlessly query your Memgraph database using natural language, this tutorial is for you. This step-by-step guide will walk you through the process, ensuring you have all the tools you need to get started.

## Prerequisites

Before you dive in, make sure you have Docker and Python 3.x installed on your system.

## Get started

**Launch a Memgraph Instance**: With a few simple commands, you can have your Memgraph instance up and running using Docker. Just <a href="https://python.langchain.com/docs/use_cases/more/graph/graph_memgraph_qa" target="_blank">follow our script</a> to set it up.

**Install dependencies**: We've got you covered with the required packages. Use pip to install `langchain`, `openai`, `neo4j`, and `gqlalchemy`. Don't forget the `--user` flag to ensure smooth permissions.

**Code playtime**: Whether you prefer working within this notebook or want to use a separate Python file, the tutorial offers code snippets to guide you through the process.


## What's inside

Explore the rich features and functionalities that LangChain and Memgraph offer together:

**API reference**: We provide an overview of the key components you'll be working with, such as ChatOpenAI, GraphCypherQAChain, and MemgraphGraph.

**Populating the database**: Learn how to populate your Memgraph database effortlessly using the Cypher query language. We guide you through the process of seeding data that serves as the foundation for your work.

**Refresh graph schema**: Familiarize yourself with refreshing the graph schema, a crucial step in setting up the Memgraph-LangChain graph for Cypher queries.

**Querying the database**: Discover how to interact with the OpenAI API and configure your API key. We'll show you how to utilize the GraphCypherQAChain to ask questions and receive informative responses.

**Chain modifiers**: Customize your chain's behavior with modifiers like return_direct, return_intermediate_steps, and top_k. Tailor the experience to your preferences.

**Advanced querying**: Delve into advanced querying techniques and uncover tips for refining your prompts to improve query accuracy.

Ready to take your data interaction to the next level? Join us in exploring the seamless synergy between LangChain and Memgraph. No more wrangling with queries – just natural language and meaningful insights. Simplify complexity, elevate your insights, and share your projects in our <a href="https://discord.com/invite/memgraph" target="_blank">community</a>.
Red Boost Reviews - Fixings Really Work or Fake Client Cases?
Published: 2023-08-25 07:05:16

When I have something to say, I will just come right out and say it. See, we'll get back to the question. I do deem that I could not give more examples. For some reason, "A penny saved is a penny earned." It shows how much confidence most reviewers have in this. It is how to recover from Red Boost predicaments. Tell me, you should learn something from it. Did you know that you can use this to amaze everyone you know? It only takes five seconds to see if it works. We're looking ahead to that week. That all plays a part in a Red Boost that organizes a property for a Blood Flow Support Powder. This is a way to get the point across as this relates to describing it. Without going into a lot of extra details: I can't believe I know so much bordering on this materialization. 

Aren't you willing and able to accept the challenge that nobody will do this? I feel rested. In my next essay I will give you a couple of Red Boost details. We want using that to be all inclusive. The response so far has been quiet. Whereby do foolish people chalk up exemplary Red Boost ideas? I can't say that I rat out this generic conclusion. 


[https://myspace.com/jobbykvan](https://myspace.com/jobbykvan) 
[https://jobbykvansspace.quora.com/](https://jobbykvansspace.quora.com/) 
[https://www.pinterest.com/pin/927037904530247129/](https://www.pinterest.com/pin/927037904530247129/) 
[https://www.behance.net/jobbykvan](https://www.behance.net/jobbykvan) 
[https://www.crunchbase.com/organization/red-boost-for-men](https://www.crunchbase.com/organization/red-boost-for-men)
Best C And C++ Training Institute In Chandigarh Mohali
Published: 2023-08-25 07:01:26

[https://www.excellencetechnology.in/best-c-and-c-training-institute-in-chandigarh-mohali/]
Excellence Technology stands out as the premier C and C++ training institute in Chandigarh Mohali, offering unparalleled education in programming. With a dynamic curriculum, industry-expert instructors, and hands-on projects, it cultivates a profound understanding of C and C++ languages.
Tech Visionaries Wanted: Who Would You Interview?
Tags: discuss, career, codenewbie, beginners
Published: 2023-08-25 07:00:00

If you could interview a tech visionary, who would it be? What intriguing questions would you ask them about their coding journey and technological outlook?

Join us on a journey that's all about newbies sharing, learning, and growing together. Follow the [CodeNewbie Org](https://dev.to/codenewbieteam) and [#codenewbie](https://dev.to/t/codenewbie) for more discussions and online camaraderie!

*{% embed* https://dev.to/codenewbieteam *%}*
Open Source: What’s Your Contribution?
Tags: discuss, career
Published: 2023-08-25 07:00:00

Do you actively contribute to open source projects? What motivates you to contribute, and what are the benefits of participating in the open source community?

This week we're exploring the experiences of seasoned developers:  their stories, hurdles, and successes. Like what you're reading? Follow the DEVteam for more discussions like this!

{% embed [https://dev.to/devteam](https://dev.to/devteam) %}
how to connect sqlite3 with cipher type : WxSQLite3 ,Cipher : system.data.rc4 encrypted database and print the table column
Tags: java
Published: 2023-08-25 06:55:22

I have tried this method but it creating new database in existing path folder and in result it printing there no such table:mytable.

`import java.sql.*;

public class Database1 {

public static void main(String[] args) throws SQLException {

// Create a connection string

String connectionString = "jdbc:sqlite:mydatabase.db;cipher=WxSQLite3;cipher _type=System.Data.RC4;key=mypassword";

// Create a connection object

Connection connection = DriverManager.getConnection(connectionString);

// Create a statement object

Statement statement = connection.createStatement();

// Execute a query

ResultSet resultSet = statement.executeQuery("SELECT * FROM mytable");

while (resultSet.next()) {

// Get the data from the result set

String name = resultSet.getString("name");

System.out.println(name);

}

// Close the connection

connection.close();

}

}`
Create an NodeJs Server in Typescript
Tags: typescript, node, javascript, tutorial
Published: 2023-08-25 06:38:27

If you're a beginner on typescript or some veteran who tends to forget how to setup a typescript server the you've come to the right place.

Here are the steps to create a typescript server up and running:


- Make a folder then, initialize the node project
```
npm init -y
```

- Install dependencies, in this case I'm installing expressjs as my web app framework but feel free to use others like fastify
```
npm i express cors dotenv
npm i -D typescript @types/node @types/express concurrently
```

- Initialize tsconfig
```
npx tsc --init
```

- Edit tsconfig.json
```
"outDir": "./dist"
```

- Edit package.json scripts
```
"scripts": {
"build": "npm install typescript && npx tsc",
"start": "node dist/index.js",
"dev": "concurrently \"npx tsc --watch\" \"nodemon -q dist/index.js\""
}
```
- Create a file named index.ts, this will server as the root file for your server. Paste this inside index.ts.
```
import express, { Express } from 'express';
import dotenv from 'dotenv';
import cors from 'cors';
import http from 'http';
dotenv.config();

const app: Express = express();
const port = process.env.PORT ?? 5905;
app.use(cors());
const server = http.createServer(app);

server.listen(port, () => {
  console.log(`⚡️[server]: Server is running at http://localhost:${port}`);
});

```

- Run build
```
npm run build
```

- Finally run the server
```
npm run dev
```
Manager Handbook for Distributed AntDB-T - P23–5
Published: 2023-08-25 06:26:19

Standalone version

Execute on the database host by logging in to the database as a superuseruser via psql. After the execution is completed, a restart of the database is required.

```
--Modify according to actual situation/Users are requested to adjust appropriately according to the host environment information
alter system set shared_buffers = '4GB' ;
alter system set maintenance_work_mem = '1024MB';
alter system set work_mem = '128MB' ;
alter system set max_connections = 1000 ;
alter system set max_prepared_transactions = 1000 ;
alter system set wal_keep_size = 51200 ;
alter system set effective_cache_size = '10GB' ;
alter system set max_parallel_workers = 10 ;
alter system set max_parallel_workers_per_gather = 10 ;
----
alter system set logging_collector = on;
alter system set log_destination = csvlog ;
alter system set log_directory = pg_log ;
alter system set log_truncate_on_rotation = on;
alter system set log_rotation_age = '7d' ;
alter system set log_rotation_size = '100MB' ;
alter system set log_min_messages = error;
alter system set log_min_error_statement = error ;
alter system set log_duration = off;
alter system set log_statement = 'ddl' ;
alter system set unix_socket_permissions = '0700' ;
alter system set listen_addresses = '*';
alter system set superuser_reserved_connections = 13 ;
alter system set track_counts = on ;
alter system set track_activity_query_size = 2048;
alter system set max_locks_per_transaction = 64;
alter system set constraint_exclusion = on ;
alter system set wal_level='replica';
alter system set max_wal_senders = 5 ;
alter system set wal_log_hints = on;
alter system set autovacuum = on ;
alter system set autovacuum_max_workers = 5;
alter system set autovacuum_naptime = '60min' ;
alter system set autovacuum_vacuum_threshold = 500 ;
alter system set autovacuum_analyze_threshold = 500;
alter system set autovacuum_vacuum_scale_factor = 0.5;
alter system set autovacuum_vacuum_cost_limit = -1 ;
alter system set autovacuum_vacuum_cost_delay = '30ms' ;
alter system set statement_timeout = 0 ;
alter system set lock_timeout = '180s' ;
alter system set wal_sync_method = open_datasync ;
alter system set wal_writer_delay = '200ms';
alter system set commit_delay = 10 ;
alter system set commit_siblings = 10;
alter system set checkpoint_timeout = '15min' ;
alter system set checkpoint_completion_target = 0.9;
alter system set max_wal_size = 10240;
alter system set archive_mode = on ;
alter system set archive_command = '/bin/date' ;
alter system set bgwriter_delay = '10ms' ;
alter system set bgwriter_lru_maxpages = 1000;
alter system set bgwriter_lru_multiplier = 10.0;
```
How to Optimize Websites with Data-Driven UX?
Tags: datadrivenux, userexperience, ux
Published: 2023-08-25 06:19:21

The digital landscape is constantly expanding and dominating the business world today. Websites play a crucial role in the success of these digitally driven businesses as they serve as a central hub to display products, services, and engage audience with interesting content and major product/service updates. However, a website’s success is intricately tied to user experience. The more seamless and engaging the user experience, the more likely visitors are to stay longer, engage with content, and convert into customers.

Read More @ https://tenjinonline.com/how-to-optimize-websites-with-data-driven-ux/
5 methods I personally use to fix bugs
Published: 2023-08-01 17:26:44

BUGS & more bugs in your code!

Bugs will happen whether you like it or not.

But it pays off to know the type of bugs they are.

External bug in an API/service your system relies on?

A syntax bug?

A logical bug?

A bug caused by server itself?

The list goes on. But that’s really the first step. You must know the type of bug you’re dealing with!

That out the picture here’s 5 methods I use personally:

**1. Dig deeper into system’s architecture.**

Pretty simple but without having broad understanding of the system you’ll struggle to find or fix the bug in a reasonable way. There’s a time when you should narrow down vs think broadly. 

Do both, you can think in details but you can’t think broadly without understanding the system. Thinking broadly means you’re less likely to break other parts of the system.

**2. Clear mental model of the bug/issue**

When issues are reported they don’t have all the information from the beginning. Often, they’re written badly. It’s your job to understand the problem fully, line by line and create a solid mental model of the problem. This is better than having to visit the issue 20 times in 30 mins because you keep forgetting the details. 

Simply put, you need your own version of the issue/bug. How you understand it, not how someone else is framing it. Onto next step…

**3. Take a walk but know where your goal really is.**

The step #2 is very important. Simply going for a walk doesn’t magically solve problems. You have to know the goal and every single detail about the bug. 

Once it’s in your head you’re free to go for a walk or make yourself a coffee. With everything absorbed in your brain, let it solve the bug in more relaxed way. Chill down now.

**4. Time does the trick**

Very easy to get frustrated but ultimately being patient pays off, if you put in enough time to resolve a bug, you’ll likely succeed. Every developer knows this! If not today, tomorrow!

**5. Code isolation**

If your code is tightly coupled, you won’t be able to focus on portions of it. If you can isolate class/function from rest of the code, you’ll resolve the issue more easily. This works because instead of thinking about 50 different files you’re focused on 2-3 files. 

It’s easier said than done. Writing classes in a way where it accepts other objects as dependency help a lot.


[Check out my books](https://samidev.gumroad.com) 🙂
Day 2: React Rendering - From Confusion to Clarity
Tags: javascript, react, beginners
Published: 2023-08-25 06:17:01



Welcome back to the second day of our journey into the world of React! Today, we're debunking myths and unveiling the true power of rendering JSX elements. Let's dive in and demystify the magic!

### **Misconception: Using `.append()` for JSX**

Our second day started with an experiment. I thought, "Hey, why not just use `.append()` to slot JSX into the DOM?" But guess what? The outcome was anything but expected. Instead of a sleek UI, my browser displayed the bizarre `[object Object][object Object]`. A head-scratcher indeed!

### **Clarification: The Right Way with React**

Soon, the fog lifted. React has its own rendering dance, and it's not a `.append()` waltz. Enter `ReactDOM.render()`, the key to the kingdom. This method taught me a vital lesson: let React work its magic. 

### **Taking on the Code**

Let's embark on a code escapade to witness this transformation.

**Code Example 1: Experimenting with `.append()`**

```jsx
import React from 'react';

function App() {
  const jsxElement = <div>AOA, JSX!</div>;

  const rootDiv = document.getElementById('root');
  rootDiv.append(jsxElement);

  return null;
}

export default App;
```

In this trial, I bet on `rootDiv.append(jsxElement)` as the silver bullet. But no, the browser had other ideas and handed me the perplexing `[object Object][object Object]`.

**Code Example 2: The Right Way - `ReactDOM.render()`**

```jsx
import React from 'react';
import ReactDOM from 'react-dom';

function App() {
  const jsxElement = <div>AOA, JSX!</div>;

  ReactDOM.render(jsxElement, document.getElementById('root'));

  return null;
}

export default App;
```

As I surrendered to the wisdom of `ReactDOM.render()`, the browser applauded. The JSX element materialized, and the words "AOA, JSX!" greeted me warmly.

**Final Code Example: The Revelation**

```jsx
import React from 'react';
import ReactDOM from 'react-dom';

// Define the JSX element
const jsxElement = <div>AOA, JSX!</div>;

// Render the JSX using ReactDOM.render()
ReactDOM.render(jsxElement, document.getElementById('root'));

// Note: Here, we return null. ReactDOM.render() does the heavy lifting.
export default function App() {
  return null;
}
```

As we conclude our journey today, remember that rendering isn't just about visuals; it's about creating experiences. Join me tomorrow as we journey deeper into the heart of React!

---
Alankit - Leading Global Solution For Attestation, Authentication & Verification Services
Published: 2023-08-25 06:11:58

Alankit Limited is an authorised partner to the Ministry of External Affairs - Govt. of India, which manages the administrative function of the Attestation/Apostille process for applicants in India and on a global level. As a market leader in e-Governance Services, the Company strives for perfection in our services, including certificate attestation, authentication, and verification under one roof.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/yu7n9904gnscy25r53o1.png)

Alankit is an entrusted Attestation/Apostille Service providing Company authorised by the Ministry of External Affairs and offers a whole gamut of certificate attestation services across India and abroad.

Address : 205-208, Anarkali Complex, Jhandewalan Extension, New Delhi -110 055
Mo - +91 9355808139
Mo - 9355808139
Website - https://www.alankitattestation.com/
Official mail - alankitmea@alankitattestation.com
Facebook - https://www.facebook.com/AlankitOfficial/
Twitter - https://twitter.com/AlankitGroup1
LinkedIn - https://www.linkedin.com/company/alankit/
Implementing API Key Authentication in ASP.NET Core
Published: 2023-08-25 06:04:13

APIs often use API keys to authenticate clients and authorize access to endpoints. In this post, we'll look at different approaches to implement API key authentication in ASP.NET Core.


## What are API Keys?

API keys are unique identifiers that a client sends to the API in requests to identify itself and authenticate. They are an alternative to token-based authentication like OAuth. Compared to tokens, API keys:

- Are simpler to implement and use
- Transmit identification but not details about the client
- Stateless so don't expire and no refresh needed
- Allow basic level of security

## API keys are commonly used to:

- Identify API consumers
- Rate limit requests
- Revoke individual client access
- Analyze API usage

## ASP.NET Core API Key Authentication

There are few different ways API keys can be implemented in ASP.NET Core:

## 1. As a Query Parameter

API keys can be sent in the query string for each request:

![API query string](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/h95hwm4pv02wir96uln7.png)

To authenticate: 

![API Authentication](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5s17612t7bs2s33xsnzj.png)


## 2. As a Header

API keys can also be sent as a custom HTTP request header:

![custom HTTP request header](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/3l87yeoapmjybkqdjtjg.png)


Read and validate the header in code:

![Read and Validated Header Code](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/hxc84jk6p83fx3g65b30.png)

 

## 3. With an Authentication Middleware

![Authentication Middleware](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/aar1a24ayt4v9oibf9u0.png)


For more advanced authentication, create a middleware to validate the API key on each request:
 
This keeps the key validation logic in a single place and preserves separation of concerns.

## 4. Using Policies and Authorization

![Policies and Authorization](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/j9kg7737p1c63xivbddm.png)


For role-based access, the API key can be used to determine a user's roles and authorization:
 
This scales authorization beyond just identification, allowing for richer access control rules.

## Final Words

Implementing API key authentication allows securing an ASP.NET Core API simply and flexibly. Keys can identify consumers and authorize access if used alongside policies. Just be sure to store and transmit the keys securely. With robust API key implementation, you can protect access to valuable API resources and functionality.

Read More: [.NET Core Libraries for Programmers](https://positiwise.com/blog/essential-net-core-libraries-that-every-programmer-should-know)