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# Computer Science

## Computer Science is the systematic study of algorithmic processes that describe and transform information. It includes the theoretical foundations of information and computation and the practical techniques of applying those foundations to computer systems. Among the many subfields of Computer Science are computer graphics, computer programming, computational complexity theory, and human-computer interaction. Questions about Computer Science, terms such as algorithms and proofs, and methodologies are encouraged in this category.

###### 1,652 Questions

What is difference between object space and image space in graphics?

Object space refers to the coordinate system in which an object's vertices and shapes are defined. Image space, on the other hand, refers to the coordinate system in which the final rendered image is created, mapping the object space to the 2D screen space by using projection and transformation matrices. Object space is typically 3D while image space is usually 2D.

What is image space and feature space in remote sensing?

The image space is the 2D plane of the image where pixels are located. It represents the spatial space of the image. In other words, when we talk about the location of each pixel in an image, we are talking about image space. On the other hand, feature space is about the radiometric values assigned to each pixel. In case of a grey-scale imagery, only one radiometric value is assigned to each pixel. When we say an image is RGB or multispectral, then each pixel has several radiometric values that are stored in different channels (for instance there are 3 channels of Red, Green and Blue in an RGB image, so for a pixel we have 3 radiometric values). Feature Space is the space of these radiometric values; the radiometric values of each pixel can be plotted in that space and you can create a feature space image. Last example, an RGB image has a 3 dimensional feature space while it still has a 2D image space.

Compaere object space and image space?

Object space refers to the 3D space in which an object exists, with coordinates defined by its size and position in relation to a fixed point of reference. Image space, on the other hand, refers to the 2D space in which an image is rendered for display, typically on a screen, with coordinates measured in pixels. The transformation from object space to image space involves mapping 3D objects to 2D images for visualization.

Is String in java a class or object?

In Java, String is a class, but it is also used to create objects. Here's a detailed explanation to clarify this concept:

String as a Class

The String class is a part of the Java standard library (java.lang.String).

It is a final class, which means it cannot be subclassed.

The String class provides a wide range of methods for manipulating and working with strings, such as substring(), length(), toUpperCase(), toLowerCase(), charAt(), and many more.

String as an Object

When you create a string in Java, you are creating an object of the String class.

For example, String s = "Hello"; creates a String object with the value "Hello".

Even though you can create string literals directly (like "Hello"), these literals are instances of the String class.

Key Characteristics of String in Java

Immutability:

Strings in Java are immutable, meaning once a String object is created, it cannot be changed.

Any operation that seems to modify a string actually creates a new String object.

String Pool:

Java maintains a pool of string literals to optimize memory usage.

When you create a string literal, the JVM first checks the string pool. If the literal already exists in the pool, it returns the reference to the existing string. Otherwise, it adds the new literal to the pool.

Example: String s1 = "Hello"; String s2 = "Hello"; Here, both s1 and s2 will refer to the same object in the string pool.

Creating Strings:

You can create strings using string literals or using the new keyword.

Example using a literal: String s1 = "Hello";

Example using the new keyword: String s2 = new String("Hello");

Using the new keyword creates a new String object in the heap, bypassing the string pool.

In summary:

String is a class in Java.

You create objects of this class when you use string literals or the new keyword.

Strings are immutable, and Java optimizes their storage using a string pool.

Understanding these concepts will help you effectively work with strings in Java and utilize their characteristics for better performance and memory management.

What was the first high level language?

The first high-level programming language was called FORTRAN, which stands for "Formula Translation." It was created in 1957 by John Backus (IBM) to help scientists and engineers write programs more easily.

Briefly describe the five stages of the cell cycle?

The cell cycle consists of five stages: G1 phase (cell growth), S phase (DNA synthesis), G2 phase (preparation for cell division), mitosis (nuclear division), and cytokinesis (cytoplasmic division), resulting in two daughter cells.

How does water effect Wi-Fi signal?

Water can absorb and block Wi-Fi signals, which can result in decreased signal strength and slower speeds. The higher the water content in the environment (such as human bodies or walls with plumbing), the greater the impact on Wi-Fi signal quality.

Explain why these 6 bits are of least significance in the image representation?

The least significant 6 bits in image representation typically encode subtle details or noise that are less crucial for visual perception compared to the more significant bits. These bits contribute to fine texture or color variations that may not significantly impact the overall image quality. In practice, discarding or compressing these least significant bits can help reduce file size without noticeably affecting the image's overall visual quality.

What statement about an FRU is true?

An FRU, or Field Replaceable Unit, is a component of a system that can be replaced by the end user or technician in the field without the need to send the entire system for repair. FRUs are designed for easy replacement to minimize downtime and reduce repair costs.

Why do Grassman's Law matter for digital colour production?

Grassman's Law is important for digital color production as it provides guidelines on how different colors can be mixed to produce accurate and consistent results. By understanding how colors interact and combine according to Grassman's Law, digital color production can be optimized to achieve the desired color outcomes on various digital platforms. This helps ensure color fidelity and consistency across different devices, such as screens and printers.

Name the indicator used in the edta method?

Erio Chrome Black-T, is usually used as indicator.

It is commonly known as EBT.

EBT can easily form weak complex ,which can be replaced easily by Sequencing agent

Ethylene Diammine Tetra Acetic acid

How many significant digits does 36.8 pentameters have?

36.8 pentameters has three significant digits.

1. Accurate detection of gas levels in liquid samples.
2. Non-invasive and does not require sample contamination.
3. Real-time monitoring and visualization of bubbles.

1. Limited to specific applications where gas bubbles are present.
2. Susceptible to interference from other particles or impurities in the sample.
3. Requires specialized equipment and expertise for implementation.

What is the scientific definition of an independent variable?

An independent variable in a scientific experiment is the variable that is manipulated or changed by the researcher. It is the factor that is being tested to see how it affects the dependent variable. The independent variable is what the researcher intentionally changes to observe its effect on the dependent variable.

What is natural language processing?

NLP is a sort of artificial intelligence that allows machines to "read" text by simulating human language understanding. One of the most useful technologies accessible to artificial intelligence systems is natural language processing (NLP).

NLP techniques use a number of methods to help a machine grasp what's being said or written in human communication in a holistic fashion, rather than just single words. Using a variety of complex algorithms, the technology allows machines to read, understand, analyse, and parse human language. To extract entities and relationships, disambiguate meaning, and interpret ambiguities in language, involves linguistics, semantics, statistics, and machine learning.

Can some one join waec and neco to apply?

Yes, candidates can sit for both the West African Examinations Council (WAEC) and the National Examination Council (NECO) examinations. However, it is essential to be aware of the examination schedules to prevent clashes in dates. Candidates must meet the requirements and register separately for each examination body.

What is the measure of how much data is transmitted during a given period of time?

The measure of how much data is transmitted during a given period of time is called data transfer rate or data throughput. It is typically expressed in bits per second (bps) or bytes per second (Bps) and indicates the amount of data that can be transmitted over a network connection in a specific timeframe.

How does entropy affect compression rate?

Entropy affects compression rate by measuring the amount of disorder or randomness in data. Data with high entropy has more randomness and is harder to compress efficiently, leading to lower compression ratios. In contrast, data with low entropy has less randomness and is easier to compress effectively, resulting in higher compression ratios.

What is the difference synchronous buses and non synchronous buses?

Synchronous buses use a clock signal to synchronize data transfers between components, ensuring that data is transferred at a predictable rate. Non-synchronous buses transfer data without a clock signal and rely on other mechanisms to coordinate data transmission. Synchronous buses are generally faster and more efficient but can be more complex to design and implement compared to non-synchronous buses.

What career would appeal to someone with an interest in both computer science and physics?

A career in research and development, such as working in quantum computing, artificial intelligence, or robotics, would be a good fit for someone with interests in both computer science and physics. These fields often require a deep understanding of both disciplines to innovate and solve complex problems.

What last longer helium fill balloon or hot air balloons?

Helium-filled balloons last longer than hot air balloons. Helium is a non-flammable, inert gas that does not expand or contract with temperature changes like hot air does. Hot air balloons require periodic reheating to maintain altitude, whereas helium balloons will gradually lose lift over time but can remain buoyant for days.

What are the goals of HCI?

Human-Computer Interaction (HCI) is a multidisciplinary field focused on the design and use of computer technology, particularly the interaction between humans (users) and computers. The goals of HCI include:

Usability: Ensuring that systems are easy to learn and use, enabling users to achieve their goals effectively and efficiently without frustration.

User Experience (UX): Creating enjoyable and satisfying experiences for users. This includes emotional responses, perceptions, and attitudes towards the system.

Accessibility: Making systems usable by as many people as possible, including those with disabilities. This involves designing for diverse user needs and abilities.

Productivity: Enhancing users' ability to complete tasks quickly and accurately. This involves minimizing errors, streamlining workflows, and reducing cognitive load.

Safety: Preventing harm to users and ensuring that systems do not contribute to errors that could lead to accidents or other adverse effects, particularly in critical environments like healthcare or aviation.

Satisfaction: Achieving a positive relationship between users and systems, which can lead to greater acceptance and prolonged use of the technology.

Efficiency: Optimizing the interaction between users and systems to minimize wasted time and effort, leading to faster task completion and reduced frustration.

Learnability: Ensuring that new users can quickly become proficient with the system, and that experienced users can maintain their proficiency over time.

Memorability: Designing systems so that users can easily remember how to use them after a period of not using them, reducing the need for retraining.

Innovation: Exploring new interaction techniques and technologies to improve the ways in which users interact with computers, pushing the boundaries of what is possible.

By focusing on these goals, HCI aims to create systems that are not only

functional but also provide a high-quality, engaging, and accessible user experience.

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The smallest unit of measurement used to describe the storage capacity of a computer is called?

The smallest unit of measurement used to describe the storage capacity of a computer is called a bit. It is a binary digit that can represent either a 0 or a 1, and is the basic building block of all digital data.

What are the issues about national language processing?