# Home

Here, you can find collections of apps, tools, and other works that I developed in my spare time. There are also non-software contents, such as articles, study materials, research findings.

### Android Apps

### Windows Apps

### iOS Apps

### Web Tools

### Mac Apps

### Extension

## Mobile Apps

All available on PlayStore and Huawei AppGallery, Some available on AppStore

**Unity**

AI

Deep Learning

Learn Language from Writing & Drawing with AI – This app is designed to help learning Japanese and Chinese languages. Kotoba-chan, an AI, will teach you how to write Kanji characters and challenge you by quizzes. There is also a mode (under research) where you can learn Kanji from drawing objects. The app demonstrates the state-of-the-art AI technologies for writing stroke recognition and image recognition, and well as character expression control. **[Android, iOS, Windows, MacOS]**

**Game, designed for language learners**

**ReactNative**

cryptography

cipher

Encode your message to hide/secure contents (cipher / text encryption & decryption) **[Android & iOS]**

**ReactNative**

Randomizer

Drawing lots on your mobile. Easy-to-use with interface designed for party & events **[Android & iOS]**

**Native Android**

Emotion Analysis

Affective Computing

Augmented Reality

Seeing your emotion aura! Facial expression analysis based on the-state-of-the-art deep learning models) [waiting for technology for improvement] **[Android]**

**Flutter**

Flash

Light

Blink colorful light using mobile, designed for cheering activities, card stunt **[Android & iOS]**

**Flutter**

Musical Notes

Play Melodies from Texts, Notepad for Melodies **[Android & iOS]**

**Designed for music learners/composers**

**Flutter**

Chat

GPS

Get Help

“Ask people Around you,” That’s what this app is designed to help you to do! **[Android & iOS]**

**Recommended for travelers**

**Flutter**

Investment

Stock

Online tools for planning your investment investors **[Android & iOS]**

**For investors**

**Native Android**

Geometry

Calculator

Small, yet powerful calculator for 2D geometric shapes. **[Android & iOS]**

**For those who study / work with geometry**

## Windows App

Available on Microsoft Store, etc.

### Little Suite (Microsoft Store)

Utility tools designed under the concept of “Simple, yet powerful”; they are simple to use, yet can help speeding up your daily tasks. They are small in size, yet can be applied and used in various situations. [Available on Microsoft Store]

**C# WinForm**

Text Processing

Text-to-Speech

Ultimate Text Fotmatter. A text editor with TTS designed for formatting data format and assisting coding. Converting file/data structure in a single click. This is an app, I always use during coding, so it is maintained well) [Updated 2022/07, well-maintained]

**For anyone, esp. writers, programmers, analysts**

**C# WPF**File Manager

A useful tool for those have many file collections. Make file management easy and fun

**For anyone**

**C# WPF**

Text-to-Speech

Table-based multi-language speech synthesis designed for language learning

**For language learners**

**C# WPF**

Data Analysis

Bulk CSV File Manager: concatenating files, extract mean/average, SD, Min, Man, Median, Mode, etc.

**For data analysts**

**C# WinForm**

mySQL

A tool for querying and exporting data from SQL Database.

**For mySQL users**

**C# WPF**

Investment

Calculator

Investment Calculator for buying and selling. With Tabs function.

**For traders, investors**

**WinForm**Calculator

Simple calculator that can store and export calculation history.

**For anyone**

### Specific-purpose Tool

Tools for research, etc

**C# WPF**Temporal Segmentation

Evaluation tool for Temporal Segmentation / Motion Segmentation Research.

**For researchers**

## Web Apps

Online tools available on this site

**ReactJS**Message Board

**Message Board (NEW)**

Designed for passing and sharing messages/data over the internet: leave your messages online / pass data to other devices

**ReactJS**Statistics

Normality Tests (Shapiro–Wilk); Paired Samples t-Test, Wilcoxon Signed-Rank test; Independent Samples t-test, Mann–Whitney U test, Kolmogorov-Smirnov test; Levene’s test for Homogeneity of Variance

**HTML,CSS,JS**Text Processing

Web-based Little Transformer

**For anyone, esp. writers, programmers, analysts**

**HTML,CSS,JS**Investment

Online tools for planning your investment

**For investors**

### Algorithm showcase & Programming Puzzle

Demonstrate algorithms to solve programming puzzles. Codes are planned to be released. (#dynamic programming) (n=22)

#### Knapsack Optimization

Given a set of items, each with a size and a value, determine the number of each item to include in a collection so that the total size is less than or equal to a given limit and the total value is as large as possible.

#### Dice Throw Problem

There are d dice each having *f* faces (numbers: 1 to *f*). Find the number of ways in which we can get sum *s* from the faces when the dice is rolled.

#### Dice Throw Probability

Statistics of Rolling Dice: The frequencies and probababilities of different numbers obtained by the throw of dice.

#### Coin Change (Change-making problem)

How many ways can we make the change, and what is the minimum number of coins that add up to a given amount of money?

#### Most Frequently Occurring Item

Finding the most frequently occurring item in a given integer array (Counting the occurrences / frequency of array elements).

#### Sorting Algorithms

Comparing different algorithms/approaches for sorting, such as Default JS Sort, Selection Sort, Bubble Sort, Insertion Sort, Merge Sort, and Quick Sort. Also comparing standard versions and applied versions (e.g., those with optimization, early termination).

#### Longest Increasing Subsequence (LIS)

Find the length of the longest subsequence of a given sequence such that all elements of the subsequence are sorted in increasing order.

#### Longest Common Subsequence (LCS)

Finding the longest subsequence common to all sequences in a set of sequences

#### Shortest Common Supersequence (SCS)

Given two strings, return the shortest string that has both strings.

#### Subarray with given sum

How many subsets can sum up to a certain number? (Find sets/arrays of numbers that add up to a given value).

#### Subarray with given multiplication

How many subsets can multiply to a certain number? (Find sets/arrays of numbers that multiply to a given value).

#### Levenshtein Distance (String Edit Distance)

Quantifying how dissimilar two strings (e.g., words) are to one another.

#### Kadane's Algorithm to Maximum Sum Subarray Problem

Given an array of integers,find the maximum subarray sum possible of all the non-empty subarrays.

#### Array Rotation

Detect if some arrays are same after rotation.

#### Non-Repeating Character

Finding unique characters in a string.

#### Fibonacci Numbers

Finding the Nth Fibonacci number and the summation from the first to the Nth, comparing recursive and iterative methods.

#### Common Element

Find common elements in arrays.

#### Egg Dropping Puzzle

Find the correct response without exceeding a (low) number of certain failure states.

Suppose you have ‘n’ eggs and you want to determine from which floors in a ‘k’-floor building you can drop an egg such that is doesn’t break. You are to determine the minimum number of attempts you need in order to find the critical floor in the worst case while using the best strategy.

#### Partition Problem

Given a set of positive integers, check if it can be divided into two subsets with equal sum.

#### Maximum Product when Cutting Rope

Given a rope of length n meters, cut the rope in different parts of integer lengths in a way that maximizes product of lengths of all parts. You must make at least one cut. Assume that the length of rope is more than 2 meters.

#### Rod Cutting Problem

Given a rod of length n inches and an array of prices that includes prices of all pieces of size smaller than n. Determine the maximum value obtainable by cutting up the rod and selling the pieces.

#### Word Break Problem

Given a string and a dictionary of words, determine if the string can be segmented into a space-separated sequence of one or more dictionary words.

**Languages and Technology used in apps above**

**Distribution Platforms**

Developer: **Pujana P**Contact for technical supports & etc. : Pujana [dot] P [at] gmail.com