String processing in c jobs

I'm seeking a skilled professional in Matlab, Simulink, and HDL Coder, with a profound understanding of FPGA, particularly the Kria SOM platform. Key Project Details: - The primary goal is to implement an Object Detection DNN on the Kria SOM FPGA. - The approach is real-time video processing, hence the need for efficiency and speed. - The system should be based on the YOLO model, which is pre-trained on the COCO dataset. - The FPGA resource utilization should be analyzed using HDL Coder by running the FPGA in a loop with MATLAB. Ideal Candidate: - Proficient in Matlab, Simulink, and HDL Coder. - Experienced in implementing DNNs on FPGA, particularly Kria SOM. - Knowledgeable on real-time video processing. - Familiarity with the YOLO model an...

.../dev/video0. The stream is in Grayscale (RG12, 12bit) format and I need assistance in creating Python code to receive this stream and make it available in a CuPy array. The primary goal is to process this data in real-time for monitoring purposes. It is crucial that the data is not copied between CPU and GPU memory. Key Requirements: - Acquire data stream from /dev/video0 on Nvidia Jetson Orin and store as an array - Use Python 3.9+ for the codebase - Process the data array for real-time monitoring - Do not copy data between CPU and GPU memory, as one frame is 17MB in size Ideal freelancer for this project should have: - Extensive experience with Python, particularly in real-time data processing - Prior experience with Nvidia Jetson dev...

I am currently experiencing payment processing errors with my PayPal plugin. All of my sales are automatically cancelled and I am not being notified. -Ideal Skills/ Experience: * Proven experience in troubleshooting PayPal plugin problems * Comprehensive understanding of payment processing * Ability to identify and solve connection issues. Let's collaborate to sort this out promptly to resume normal business operations.

...design. - Conduct thorough testing across different platforms to ensure functionality and responsiveness. - Maintain regular communication with the project team to ensure alignment and address any technical challenges. **Key Skills Required:** - Strong experience in game development with a portfolio of successful projects. - Proficiency in JavaScript, C#, Python, and frameworks like Unity or Phaser. - Demonstrable experience with both web and mobile game development. - Knowledge of API integration for real-time data processing. - Ability to work independently and manage time effectively. **Deliverables:** - A fully functional front-end application for web and mobile. - Documentation of the development process and code. - Regular updates and mi...

...chosen to illustrate both books in it's entirety. Total budget for both complete books is $650. There will only be 12 illustrations for the girl book and 13 illustrations for the boy book. Here are the character descriptions for the 3 boy characters: Character A: Age 7, Full curly afro, caramel-skinned, on the right of the cover Character B: Age 7, Dread locks, dark-skinned, in the center of the cover Character C: Age 10, Braids, light skinned, on the left of the cover I've attached a photo of the characters and want to see if you can replicate the illustration style, hair styles, and skin complexions. LITTLE BROWN BOY BOOK COVER: The cover should have Characters A, B, and C on it. They should all be facing forward, with huge smiles. Place Cha...

I'm in need of an expert in ASP.NET Core 8, visual studio 2022, and ChatGPT 4 for a unique project. I require a tool/webpage that can seamlessly re-write chapters of my book for me. My book has 25 chapters. Each chapter contains between 10 and 30-pages. Each chapter is written in MS Word (.docx) document and must be converted into FORMAL and PROFESSIONAL-style content. This project requires the following key features: - **Input & Output Format**: - The system must take a Word document as input. - The output should be a Word document while preserving all the original formatting. - **Language Support**: - The tool should be able to rewrite the document in both English and Spanish. - **ChatGPT Version**: - I prefer the latest ChatGPT 4 for th...

I'm in need of a proficient expert who can assist me with running queries on DuckDB using data originating from Amazon S3. This task primarily involves: - Interacting with semi-structured data such as XML and JSON - Processing a substantial data volume ranging from 1GB to 1TB The ideal freelancer should have the following capabilities: - Deep understanding and experience with DuckDB and Amazon S3 - Strong skills in handling and querying semi-structured data - Experience in managing and processing large volumes of data Please note: it's critical that the freelancer have experience with managing these sorts of tasks previously and has a solid understanding of large volume data manipulation.

I'm in need of an experienced Node.js backend developer who can build a robust REST API. The ideal candidate should be proficient in MySQL, and have experience in user authentication, data retrieval, and data modification. Key Requirements: - Develop User Authentication: The API should include secure user authentication functionality. - Implement Data Retrieval: The API must be able to retrieve data from MySQL database as needed. - Data Modification Capability: The API should also support updating and deleting data in the database. Additional Needs: - Third-Party Integrations: The API will need to integrate with a payment processing system and also be able to send WhatsApp messages. If you have a strong background in Node.js, MySQL, and bu...

...professional who can assist me in enhancing the script. Requirements: - The script should be able to validate the existence of email mailboxes without freezing when processing a large volume of emails. - Email verification must be accurate and reliable, and the script should be able to handle a large list of emails efficiently. Key points for the project include: - Implementing a more efficient algorithm to handle large email lists without freezing. - Ensuring that the script provides accurate validation of email mailbox existence. Ideal Skills: - Strong proficiency in Node.js and email verification techniques. - Experience in optimizing scripts to handle large datasets without performance issues. - Good understanding of efficient algorithms and their imp...

...table which I then paste into excel. I do calculations in excel to find out what percent each ingredient is of a total formula. Then I create a new entry into a table in Airtable and paste this data into a different table in Airtable which references the first table. I need someone to automate this data extraction process, calculations and entry into two separate Airtable tables so I can do it repeatedly myself. I work in a standardised operating environment for work so ideally I need a web based solution rather than one installed on my computer but on my phone would be ok. Ideal Skills: - Proficient in data extraction from unstructured sources - Experience in automating data processing tasks - Familiarity with Airtable Please write A...

I'm seeking an audio professional, preferably with experience in denoising audio files, specifically meeting recordings. The main issue at hand is the removal of consistent background noise of people talking. It's imperative that a careful approach is executed, as there are very frequent phrases or words that need to remain intact despite the background chatter. Skills and Experience: - Proficiency in audio editing software - Prior experience in denoising audio files - Familiarity with processing meeting recordings - Keen ear for differentiating important dialogues from unwanted noise. Your task is to clean up the audio file without losing substantial information. Please, apply and let's make our meeting discussions clear and concise.

...user interaction in my Spring Boot application by integrating ChatGPT. The main purpose is to provide basic Q&A functionality within my system, so the complexity of the integration should focus on this. Key Requirements: - **Enhanced User Interaction**: The primary goal of this integration is to enhance user interaction through basic Q&A functionality. - **Integration Method**: I intend to use the ChatGPT API where I'll send text and image data for processing. The desired outcome is a response that can be used to engage with users. Ideal Skills: - **Spring Boot**: A strong understanding of Spring Boot is crucial to ensure seamless integration of ChatGPT within my application. - **ChatGPT API**: Experience working with the ChatGPT API or similar natural langu...

We are looking for developers who are proficient in WooCommerce and Google Sheet API to help with our ongoing project to improve some of it's functionalities and features. Key Responsibilities: - Assist in setting up WooCommerce functionalities on a website, including product catalog, shopping cart, and payment gateway integration. - Implement integration with Google Sheet API for specific data processing & syncing requirements. Ideal Candidate: - Proficient in WooCommerce, including setting up product catalog, shopping cart, and payment gateway integration. - Experienced in integrating external APIs, specifically Google Sheet API, App Scripts Programming. - A good understanding of data processing and how to leverage Google Sheet for suc...

...unique brand story. The page should convey our deep commitment to quality, sustainability, and supporting our farming communities. It should engage viewers' senses and emotions, instilling a greater appreciation for the artistry and care behind our vanilla. Key Project Requirements: 1. Visual Storytelling: - Organize the page's flow to follow our vanilla's journey, guiding users through the process in an intuitive, engaging way - Draw all steps, Incorporate high-quality images, illustrations, and/or animations to richly visualize each step and bring our process to life - Design infographics or interactive elements to explain key concepts like curing, conditioning, and grading - Utilize images of our vanilla terroir, farmers, and facilities to forge a deeper conne...

I'm in need of a freeware expert capable of building an efficient and user-friendly GUI in C for a Pacman game coded in C. The system should contain: - Data input forms to allow ease of data entry - Visual data displays to allow smooth and instant data interpretation - Interactive navigation menus for efficient browsing through the system Ideal candidates for this task would be proficient in C, with a solid understanding of GUI design for Windows operating systems. Previous work with data input forms, visual data interfaces, and navigational system design will be advantageous. Project needs to be done in maximum 10 hours

I need a proficient Matlab user who can help me Deadline: 3 days

...working on a school project that involves the development of a Coal Mining Security Alert System. I need someone who can code in Quarky to create this block code system. Unfortunately, I haven't gotten to the point of defining the complete scope of the project, but I'd like to start with the code development. I'm looking for someone who can: - Use Quarky to build a block code system - Understand and implement basic security alert functionalities - Be ready for subsequent feature additions and changes Key Features: = Face Detection: Implement face detection functionality to identify individuals within the mining area. = PPE Kit Verification: Utilize image processing techniques to ensure that miners are wearing proper PPE kits. The system should stop if the ...

I'm looking for help from a talented programmer with C++ experience and low-level programming knowledge. The main purpose of this project is to develop a keyboard input emulator specifically for gaming purposes. Basic requirements: - Compatibility: The emulator must be designed to run on Windows operating systems. - Programming Language: It is important to develop the emulator using C++. - Purpose: Macro tests will be performed with the emulator in the game. Your role will be as follows: - Design and develop a reliable and efficient keyboard input emulator for gaming. System level programming is required. (It will simulate the keyboard on the hardware and perform keydown and keyup operations. I want it to press the z1 key when the Capslock LED is on. I want it t...

Just a quick bit of help needed in excel macro writing. See attached before and after showing a piece of the original data. and what i neeed the macro to achieve. WHAT IM ASKING If two adjacent cells in column b are equal, then add cells adjacent column c cells, put the result in the first column c cell and remove the duplicate row. AEE ATTACHED png. I need a tailored solution for a data manipulation task within Excel. Specifically, I am looking for an Excel macro that can accurately merge cells based on their adjacency. Essential skills and experience should include: - Expert knowledge of Excel and its macro functionality - Prior experience with data manipulation tasks such as merging cells - Understanding the rules or criteria for merging spec...

I urgently need a professional to resolve unspecified errors on my Shopify Store. I overlooked providing specific details on the issues, but one with experience in identifying and quickly rectifying a wide range of Shopify errors will be ideally suited for this project. Skills and Experience: - Comprehensive knowledge of Shopify platform - Experience with various Shopify themes - Proficiency in troubleshooting and resolving website loading, payment processing, and product display errors. - Excellent problem-solving skills Due to the urgency of the project, it would be best to get it completed as soon as possible. Your rapid response would be greatly appreciated.

I am in need of a skilled professional with solid experience in Electronic Payment Gateway Systems. The main purpose will be securing online transactions with efforts mainly aimed at: - Implementing and managing payment processing tools. - Facilitating secure transactions primarily via credit/debit cards and bank transfers. The ideal consultant should have a proven background in: - E-commerce platforms and tools. - Cybersecurity - Managing credit/debit card transactions and bank transfers through payment gateway systems. - Setting up streamlined and hassle-free payment processes. Unfortunately, the type of transactions my system will primarily support hasn't been decided yet, so flexibility and advice in this regard will be appreciated. Exper...

I'm seeking an experienced bookkeeper who can assist with financial statements preparation, accounts payable/receivable management, and payroll processing for my business. We are in a stable and growing financial state, so maintaining and improving upon this is crucial. Ideal Skills and Experience: - Proficiency in QuickBooks - Background in managing financial statements, accounts payable/receivable, and payroll - Experience in supporting stable and growing businesses Your role will entail managing financial records and providing a clear overview of financial status. Your ability to ensure accuracy and timeliness will be highly valued.

I'm looking to integrate Open AI capabilities with Google Sheets to create an AI assistant that can provide our customer real time inventory information when asked. Key Project Details: - Th...can provide our customer real time inventory information when asked. Key Project Details: - The main task of the AI assistant will be to provide real-time inventory information from Google Sheet that contains our inventory data. Ideal Skills: - Solid experience with Google Sheets API - Proven track record of integrating AI tools with external data sources - Understanding of real-time data processing and automation - Familiarity with predictive inventory management would be a plus I'm looking for a freelancer who can bring both technical expertise and creative problem-solving ski...

I need a professional C#, C or Python programmer with knowledge of MAC/IP

I'm in need of a skilled Matlab expert that can assist me with an image detection project. The particularities of the images, real-time versus offline processing, and the output format are all flexible and can be discussed according to your expertise and recommendations. Key Requirements: - Proficiency in Matlab - Previous experience in image detection - Ability to discuss and decide on the most suitable approach and output format Feel free to share your relevant experience and suggestions to ensure the project goes smoothly. Looking forward to working with you.

I am in need of an AI developer who can help me with BUILDING AN APP FOR AMERICAN PROMUNCOATION TRAINING a natural language processing project specifically centered around speaker identification. Key Responsibilities: - create an app with data ( speech exercises and text) - integrate AI to correct speakers in real time! I'm looking for a professional with: - Proven experience in natural language processing, particularly in speaker identification. - Strong skills in machine learning, particularly in implementing speech recognition systems. - Excellent communication skills to understand and translate my needs into a functional and user-friendly system.

I'm in need of an experienced C# desktop programmer who is well-versed in SQL Server 2019. The primary task is to ensure that new columns added to the database are correctly displayed in the Excel report generated by the application also fix some minor areas that will discuss in detail Key Responsibilities: - Troubleshoot and fix the issue of new columns not being displayed in the Excel report - Ensure that all relevant data is correctly fetched from the SQL Server 2019 database - Implement a seamless solution that does not affect the overall functionality of the application Ideal Skills and Experience: - Strong proficiency in C# programming language - Expert knowledge of SQL Server 2019, including stored procedures and functio...

As the project owner, I'm searching for a proficient AI engineer who can expertly manage the Stack AI platform. Your three main objectives would be: 1. **Data Processing & Model Training:** - You'll need to clean and preprocess data within Stack AI - Also, train and evaluate models for maximum performance. 2. **Implement Google Search and ChatGPT Workflow:** - Familiarity with Google Search API and its integration into ChatGPT is a must. - Implement natural language processing to handle user queries - Design an intuitive and user-friendly interface to facilitate user interaction with the search process. 3. **Professional Recommendation Creation:** - Lastly, your task is to create a recommendation system using Stack AI that will offer profe...

For my project, I'm looking for a highly detail-oriented professional with brilliant Excel skills. Key responsibilities include: - Managing and transferring both numerical and textual data in an Excel spreadsheet, ensuring the correct placement into columns marked by letters (A, B, C, etc). - You'll not be required to order the data in any specific way, just transfer into the appropriate columns. Skills & Experience: - Proven record in data entry tasks - Strong Excel skills - Ability to understand and interpret numerical and textual data Looking forward to your bids and kicking into this project soon!

I’m looking to move from tebex to sell digital products for Rust, a popular online game. I am in need of a developer who specializes in creating stores leveraging a headless API for payment processing. Here's what the project would entail: - Building a digital game store to sell in-game currency, items, equipment, and game modifications. - The store should also issue commands to the Rust game server when a purchase is made. Ideal Skills and Experience: - Experience with APIs, specifically headless APIs, and payment processing integrations. - Demonstrable experience in creating webstores. - Familiarized with gaming servers, particularly Rust. - Experience in handling digital products.

Project Overview: I am developing an RC plane equipped with a processor and a camera, designed to stream real-time video to a React Native Android application. While I have already built the plane and the application, I am currently experiencing a latency of 1-2 seconds in the video stream. My goal is to reduce this latency to 100-200 milliseconds. I am seeking a freelancer to develop a script that will run on the processor mounted on the RC plane, ensuring the video stream meets the desired latency requirements. Project Requirements: Objective: Develop a script to reduce video stream latency to 100-200 milliseconds. Ensure the script runs efficiently on the processor mounted on the RC plane. Integrate the low-latency video stream with the existing Reac...

I'm in need of a skilled web developer and programmer to assist with my current project. Unfortunately, I wasn't able to specify the exact purpose of the site, the features I require, or the target audience. However, I can provide additional information once we're in discussion. Key Responsibilities: - Collaborate with me to determine the website/application purpose, features, and target audience - Develop and code the site/application based on our discussions - Ensure the final product is user-friendly and responsive Ideal Candidate: - Proficient in web development and programming - Excellent communication skills - Able to adapt and work with evolving project requirements - Experience in eCommerce, database integration, and payment processin...

I'm in need of a data entry expert in Andhra or Telangana who can assist with medium-sized projects. The tasks are of 2 main types: Spreadsheet data entry and Manual Data Entry. The data is currently in the form of Data Filtering and Processing. The ideal freelancer should have: - Fast hands and typing skills - Proficiency in spreadsheet data entry - Experience in manual data entry - Previous experience in data filtering and processing - Availability to handle medium-sized tasks (100-500 entries) - Should be located in Andhra or Telangana, India Please bid only if you meet the above criteria. Looking forward to your bids.

is New York based Ecommerce company involved in processing of online print orders since 2010. Key Responsibilities - We are looking for AWS Linux Web Administrator to set up new and modify the existing AWS EC2 instance running Laravel application on Bitnami LAMP stack. Set up new dev server on AWS or Digital Ocean. Skills and Experience: - Minimum 3 years verifiable experience as Linux Web Administrator in creating and managing existing and new LAMP EC2 instance. Laravel application hosting experience preferred. Duration: Permanent: assignment and based on completed work items

Looking at implementing a hosted/private version of for multi-PDF generative AI. I'm looking ...generative AI. I'm looking to develop a state-of-the-art AI system that can analyze multiple PDF documents at once. Key Requirements: - The system must be able to analyze multiple documents to generate coherent and informative summaries Ideal Skills and Experience: - Proven experience in developing AI systems, particularly focused on content generation - Strong understanding of natural language processing and machine learning - Background in creating systems that can handle multi-document analysis - Previous work in generating content for professional audiences would be a plus Please feel free to reach out if you believe you have the right expertise fo...

I'm on the lookout for a skilled RHEL Engineer to assist in getting our server on the Certified Hardware List. The role will require expertise in the core language of RHEL. Although I'm unsure if proficiency in C is obligatory, having it would be a welcome advantage. Specifically, the Engineer will: - Understand the requirements for RHEL certification - Prepare the server for the process - Perform the tasks and tweaks necessary to meet certification conditions I anticipate that a strong understanding of programming, RHEL, and Linux-based operating systems will be necessary. Experience with server certification will also be highly beneficial.

I'm looking for a skilled developer with experience in cTrader platform and C# programming to create a custom Renko-based cBot for me. Key Requirements: - C# Proficiency: The developer should be well-versed in C# programming language, as the cTrader platform typically uses this language for cBots. - cTrader Platform Knowledge: Experience with this platform is essential, the developer should have a strong understanding of how to work with its APIs and develop cBots. - Custom Renko Functionality: I need the developer to implement a custom brick size for Renko charts in the cBot. -Automated Trading Execution: The cTrader bot should be able to automatically execute trades based on the parameters of the strategy. - Backtesting and optimisation c...

Project Overview: I am seeking to have a custom Google Sheets system created for a group within a GTA V roleplay server. Our group imports special items for other groups, and we need an efficient way to manage these transactions. Requirements: Main Sheet: Buttons: Treasury Deposit/Withdrawal: A button that, when clicked, presents a dialog or an input field dir...for each item (a list of items, their prices, and weights will be provided). TreasuryDB: A dedicated sheet to track all deposit and withdrawal transactions. ShipmentDB Sheet: A dedicated sheet to store all shipment records, including item details, quantities, weights, and prices. Additional Details: User-friendly interface for ease of data entry and retrieval. Automated calculations and data processing to minimize manu...

I need cad models made of these clasps in matrixgold 3dm format. These are approx 23 designs. I want wholesale price dont contact me if your prices are too high

an experienced C++ or Python or Tenserflow or Java or AI (etc.) developer to create a software program for Windows. A skilled developer with expertise in creating a dynamically pixelating images (not simple machine or grid pixelation). The program should have the following functionalities: - dynamically pixelate any imported image into mathematical, non-mathematical or custom shapes in various styles with user adjustable settings and configurations - adding additional shapes into the created shapes in separate layers to create more complex outcomes - export of the pixelated images as 300dpi vectorized or rasterized files - intuitive interactivity with user friendly adjustments, selections and editing The ideal freelancer would have extensive experience in...

Hi Rajib C., I noticed your profile and would like to offer you my project. We can discuss any details over chat.

...verify through OTP) b) Email id (Must verify through OTP) c) GST Number (if available ) d) Google map location (if available) after successful registration customer can login and request quotations 3. All the products details like: Product Name, photo, description, features, pdf (data sheet), warranty information, stock (available quantity), sale prices etc. can be uploaded directly through portal and mobile app and also can be uploaded through excel sheet with serial number of all products. 4. Customer can see all the uploaded products and can request for quotation. There is no need to show the available quantity (stock) to customers. 5. Admin can see the requested quotes where the prices and quantity will be reflected of all the products in quotation. Admin can edit the...

I'm in need of a skilled developer with strong experience in NodeJS, React, and Next/NestJS. The project I have in mind is a custom web application that will require: - Search Functionality: The application will have a search feature that allows users to find specific content or items efficiently. This will require robust search algorithms and user-friendly interfaces. - Payment Gateway Integration: The application needs to support payment processing. You'll need to integrate a payment gateway to handle transactions securely and seamlessly. Your experience in SQL will also be valuable to ensure efficient data management and integration with the web application. Please provide examples of your past work that demonstrate your expertise in...

Implement Mac Filtering to allow specific Mac addresses to connect to a Windows Server 2016 and Windows 10 via Remote Desktop Protocol (RDP). Disable Right Click functionality for RDP users. Restrict Copy-Paste functionality (Ctrl+C, Ctrl+V) for RDP users. Implement measures to disable file transfer capabilities for RDP users.

...professional who can help me enlist my collection of leather bags and wallets onto existing e-commerce site like amazon, flipkart, ebay, shopify etc. I also need help with managing the online selling process. Ideal Skills and Experience: - Prior experience with leather goods is a plus - Proficiency in e-commerce platforms and product listing - Strong understanding of e-commerce marketing and selling strategies - Excellent written communication for product descriptions - Familiarity with various payment processing methods Key Responsibilities: - Enlisting the available leather goods onto the e-commerce platform - Creating engaging product listings with attractive product images, detailed descriptions, and accurate price information - Managing the online selling process, ...

...client, I’m engaging this project for an in-depth investigation purpose. I have numerous photographs capturing crimes and betrayals, some of which have been under or over exposed on purpose. My key requirement hinges on using comprehensive digital image processing techniques to extract hidden information from these photos. The ideal freelancer for this task would have a strong background in this field, with proven expertise and enhanced skills. Expectations from the investigation include: • High level of detail: I need precise features clearly identified, even clear text if possible. The ultimate goal is to achieve the best possible clarity on the obscured parts of these crucial images. Therefore, this job best suits individuals who are proficient ...

As an entrepreneur, I am seeking a proficient web developer to construct an innovative e-commerce website boasting a unique QR code feature and credit card processing capabilities. Experience in handling similar projects would be ideal. You need to: - Develop a user-friendly e-commerce website - Integrate a credit card processing system - Design an exclusive QR code feature to download the application If you are a creative problem solver with outstanding skills in web development and have a history of incorporating payment systems into platforms, your application would be strongly considered. Show me your track record of similar work, so I can foresee how successful our project can be.

I'm in need of a skilled programmer to create an automation code page for me. This code page will be focused on text processing, so a strong understanding of working with textual data is essential. Key Requirements: - Proficient in JavaScript: The automation code should be written in JavaScript to ensure compatibility with other platforms. - Automation Experience: The primary function of this code will be automating tasks. A proven track record in building automated processes is highly desirable. - Text Processing: The code must be able to accurately and efficiently process textual data. Experience in this field will be a huge advantage. If you have experience in JavaScript, a background in automation, and a strong fami...

I'm looking for a C# developer to build an application for me. You need to make C# application (app/web/console whatever is best for you). Basically, it is POST, GET, PUT, DELETE requests against API. Problem is that there is limited documentation, so you must conclude based on swagger documentation how to implement each of functions. Swagger link will be provided. Please, apply for this job if you can do it TODAY.

...create a Telegram bot with natural language processing capabilities that can generate PowerPoint presentation files (.ppt). The bot will guide users through a series of steps to create a fully customized presentation. The ideal candidate should have experience in bot development, PowerPoint automation, and natural language processing. Key Requirements: - The bot should be compatible with both the Telegram mobile app and web version. - It should primarily focus on generating slides based on provided text inputs. Ideal Skills/Experience: - Proficiency in natural language processing - Extensive experience in building Telegram bots - Proven track record in developing AI for image retrieval - Previous work on user interaction desig...