• 인지과학
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• 제2권2호
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• pp.309-339
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• 1990

인간이 서로 통신하는 가장 일반적인 방법은 자연어로 말하거나 글로 나타내는 방법이다.그러나 현재 기술로는 컴퓨터를 사용하려면 인위적인 프로그램밍 언어를 별도로 습득하여만 한다.만약 컴퓨터가 사람들이 말하거나 또는 글로 나타낸 자연어들을 이해할 수 있다면 사람들은 월씬 더 쉽고 자연스럽게 컴퓨터를 사용하게 될 것이다. 그러나 여기서의 문제점은 인간이 사용하는 언어가 많은 경우에 애매 모호하다는 것이다.예를 들어 '키큰'혹은 '젊은'과 같은 주관적 느낌을 표현하는 단어를 기존의 컴퓨터 시스템에서는 처리할 수없어,오히려 '25세이상'과 같이 정확한 조건을 명시해야만 원하는 정보를 얻을수 있다.본 연구에서는 이와 같은 fuzzy 정보를 포함하는 문장을 처리할수 있는 지식 기반형 자연어 질의 응답 시스템 개발을 목표로 블랙보드 개념을 도입하고 있다.이러한 시스템을 개발하려는 목표는 임의의 데이타베이스 시스템 및 음성 이해 시스템을 연결사용이 가능한 portable질의 응답 시스템을 개발하려는데 있다.

• Journal of Power Electronics
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• 제9권3호
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• pp.507-515
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• 2009

This paper proposes an autonomous decentralized control for a parallel connected uninterruptible power supply (UPS) system based on a fast power detection method using a FPGA based hardware controller for a single phase system. Each UPS unit detects only its output voltage and current without communications signal exchange and a quasi dq transformation method is applied to detect the phase and amplitude of the output voltage and the output current for the single phase system. Fast power detection can be achieved based on a quasi dq transformation, which results in a realization of very fast transient response under rapid load change. In the proposed method, the entire control system is implemented in one FPGA chip. Complicated calculations are assigned to hardware calculation logic, and the parallel processing circuit makes it possible to realize minimized calculation time. Also, an Nios II CPU core is implemented in the same FPGA chip, and the software can be applied for non-time critical calculations. Applying this control system, an autonomous decentralized UPS system with very fast transient response is realized. Feasibility and stable operation are confirmed by means of an experimental setup with three UPSs connected in parallel. Also, rapid load change is applied and excellent performance of the system is confirmed in terms of transient response and stability.

• 교육시설
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• 제9권2호
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• pp.37-50
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• 2002

Computers have become an indispensable part of everyday lives in 21st century. This is particularly true in early childhood education; multimedia use in kindergarten has rapidly grown in the last decade. Although ample research had been done on the issues of teachers' role in multimedia settings and selecting quality materials, few studies have been done on the proper environment for multimedia use in early childhood education. In this regard, this research examines the current status of multimedia use-animated illustration films, CD-ROM titles, and internet-in kindergarten. In addition, computer environment in kindergarten is investigated in order to provide guidelines for appropriate facilities and equipments. For smooth integration of computer activities into a school system, computers are located in ordinary classrooms in more than half of kindergarten in Seoul. Computers are used in independent lab settings in the last of the kindergarten in Seoul and there are four different types of lab settings. Among them computer at perimeter style is preferred for the ease of student-teacher, and student-student interactions. The importance of environment for early childhood education cannot be overestimated. It is so critical for early childhood education that the people in this field regard the environment as 'the third teacher' next to parents and teachers. Therefore the multimedia environment should also be considered seriously for the maximum use in early childhood institutions.

• 디지털콘텐츠학회 논문지
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• 제10권3호
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• pp.447-452
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• 2009

정보화 시대에 정보에 대한 공유와 함께 네트워크에 연결된 다른 컴퓨터에 대한 다양한 제어 기술이 나타나기 시작했으며 이 중 하나가 원격제어 시스템이다. 그러나 기존 원격제어 시스템은 제한적인 기능에 의해 사용상의 불편한 점이 많았다. 예를 들면 제어를 위한 서버 프로그램이 실행되어야 하므로 이를 위해 컴퓨터 전원이 항상 켜져 있어야 하며 상대방의 원격제어 허락에 의해서만 1대1 원격제어가 가능하다는 것이다. 이러한 기존 원격 시스템의 한정된 제어 기능 문제를 해결하기 위해 본 논문에서는 한 대의 서버 컴퓨터로 여러 클라이언트 컴퓨터를 연동함으로써 1대1이 아닌 다중 클라이언트 컴퓨터에 원격으로 전원 제어가 가능하도록 WOL(Wake On Lan) 기능을 적용한 시스템을 구현하였다.

• Journal of Information Processing Systems
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• 제8권3호
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• pp.521-538
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• 2012

As the knowledge society matures, not only distant, but also off-line universities are trying to provide learners with on-line educational contents. Particularly, high effectiveness of mobile devices for e-Learning has been demonstrated by the university sector, which uses distant learning that is based on blended learning. In this paper, we analyzed previous m-Learning scenarios and future technology prospects. Based on the proposed m-Learning scenario, we designed cellular phone-based educational contents and service structure, implemented m-Learning system, and analyzed m-Learning service satisfaction. The design principles of the m-Learning service are 1) to provide learners with m-Learning environment with both cellular phones and desktop computers; 2) to serve announcements, discussion boards, Q&A boards, course materials, and exercises on cellular phones and desktop computers; and 3) to serve learning activities like the reviewing of full lectures, discussions, and writing term papers using desktop computers and cellular phones. The m-Learning service was developed on a cellular phone that supports H.264 codex in 3G communication technology. Some of the functions of the m-Learning design principles are implemented in a 3G cellular phone. The contents of lectures are provided in the forms of video, text, audio, and video with text. One-way educational contents are complemented by exercises (quizzes).

• International Journal of Computer Science & Network Security
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• 제21권8호
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• pp.167-176
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• 2021

This is the world of computer science and innovations. In this modern era, every day new apps, webs and software are being introduced. As well as new apps and software are being introduced, similarly threats and vulnerable security matters are also increasing. Web apps are software that can be used by customers for numerous useful tasks, and because of the developer experience of good programming standards, web applications that can be used by an attacker also have multiple sides. Web applications Security is expected to protect the content of critical web and to ensure secure data transmission. Application safety must therefore be enforced across all infrastructure, including the web application itself, that supports the web applications. Many organizations currently have a type of web application protection scheme or attempt to build/develop, but the bulk of these schemes are incapable of generating value consistently and effectively, and therefore do not improve developers' attitude in building/designing stable Web applications. This article aims to analyze the attacks on the website and address security scanners of web applications to help us resolve web application security challenges.

• International Journal of Computer Science & Network Security
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• 제21권1호
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• pp.107-118
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• 2021

The term Internet of Things (IoTs) refers to the future where things are known daily through the Internet, whether in one way or another, as it is done by the method of collecting various information from various sensors to form a huge network through which people, things and machines are helped to make a link between them at all time and anywhere. The IoTs is everywhere around us such as connected appliances, smart homes security systems and wearable health monitors. However, the question is what if there is a malfunction or outside interference that affects the work of these IoTs based devises? This is the reason of the spread of security causes great concern with the widespread availability of the Internet and Internet devices that are subject to many attacks. Since there aren't many studies that combines requirements, mechanisms, and the attacks of the IoTs, this paper which explores recent published studies between 2017 and 2020 considering different security approaches of protection related to the authentication, integrity, availability and confidentiality Additionally, the paper addresses the different types of attacks in IoTs. We have also addressed the different approaches aim to prevention mechanisms according to several researchers' conclusions and recommendations.

• International Journal of Computer Science & Network Security
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• 제21권6호
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• pp.137-142
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• 2021

Machine-learning systems have proven their worth in various industries, including healthcare and banking, by assisting in the extraction of valuable inferences. Information in these crucial sectors is traditionally stored in databases distributed across multiple environments, making accessing and extracting data from them a tough job. To this issue, we must add that these data sources contain sensitive information, implying that the data cannot be shared outside of the head. Using cryptographic techniques, Privacy-Preserving Machine Learning (PPML) helps solve this challenge, enabling information discovery while maintaining data privacy. In this paper, we talk about how to keep your data mining private. Because Data mining has a wide variety of uses, including business intelligence, medical diagnostic systems, image processing, web search, and scientific discoveries, and we discuss privacy-preserving in deep learning because deep learning (DL) exhibits exceptional exactitude in picture detection, Speech recognition, and natural language processing recognition as when compared to other fields of machine learning so that it detects the existence of any error that may occur to the data or access to systems and add data by unauthorized persons.

• International Journal of Computer Science & Network Security
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• 제21권1호
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• pp.77-83
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• 2021

The dependency on technology has increased with the increase in population. Technology plays a crucial role in facilitating, organizing and securing people's life nowadays. The Internet has penetrated every face of present-day lifestyles. Yet another ubiquitous use of digital technology today is evident in transferring money and speeding cross border payments that are done through digital transactions. This paper investigates transferring money and data through banks and companies by using the Blockchain concept through decentralized distributed system. The present research also peruses several contexts in which this technology has already been implemented successfully and demonstrates the advantages of replacing the paper money with digital money. Using cryptocurrency will facilitate people's life by reducing time, securing the process of money transfer, and increasing data integrity. The primary benefit of this content analysis is that it addresses an innovative subject, in a new light and using timely recent research references drawn from 2018-2020. Thus, our study is a contemporary and conclusive source for all present and future endeavours being undertaken in the domain of using blockchain for e-transactions.

• International Journal of Computer Science & Network Security
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• 제22권5호
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• pp.193-203
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• 2022

After the everyday use of systems and applications of artificial intelligence in our world. Consequently, machine learning technologies have become characterized by exceptional capabilities and unique and distinguished performance in many areas. However, these applications and systems are vulnerable to adversaries who can be a reason to confer the wrong classification by introducing distorted samples. Precisely, it has been perceived that adversarial examples designed throughout the training and test phases can include industrious Ruin the performance of the machine learning. This paper provides a comprehensive review of the recent research on adversarial machine learning. It's also worth noting that the paper only examines recent techniques that were released between 2018 and 2021. The diverse systems models have been investigated and discussed regarding the type of attacks, and some possible security suggestions for these attacks to highlight the risks of adversarial machine learning.