• Title/Summary/Keyword: 노트북

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A Study on Multi-resolution Screen based Conference Broadcasting Technology (멀티 해상도 스크린 기반의 컨퍼런스 중계방송 기술 연구)

  • Kim, Young-ae;Yang, Ji-hee;Park, Goo-man
    • Journal of Broadcast Engineering
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    • v.23 no.2
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    • pp.253-260
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    • 2018
  • Personalized media broadcasting services can produce their own broadcasting contents with a variety of creative themes if they have just a transmission platform and devices that can obtain videos and voices of producers without the existing expensive equipment. In this paper, we develop and implement a new broadcasting system by applying this service framework to events such as seminars or academic conferences. The devices can be installed at each conference rooms and the integrated system transmitted to users. They can watch via their multi-resolution screen, such as smart-phones, laptops, and tablet PCs. It has the advantage of being able to receive real-time streaming and VOD services as well as additional information related to the conference. It is expected to provide convenience by allowing attendees to access the information via their devices, thereby creating an impact on participation and the underlying technology for the future research.

An Efficient Buffer Cache Management Scheme for Heterogeneous Storage Environments (이기종 저장 장치 환경을 위한 버퍼 캐시 관리 기법)

  • Lee, Se-Hwan;Koh, Kern;Bahn, Hyo-Kyung
    • Journal of KIISE:Computer Systems and Theory
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    • v.37 no.5
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    • pp.285-291
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    • 2010
  • Flash memory has many good features such as small size, shock-resistance, and low power consumption, but the cost of flash memory is still high to substitute for hard disk entirely. Recently, some mobile devices, such as laptops, attempt to use both flash memory and hard disk together for taking advantages of merits of them. However, existing OSs (Operating Systems) are not optimized to use the heterogeneous storage media. This paper presents a new buffer cache management scheme. First, we allocate buffer cache space according to access patterns of block references and the characteristics of storage media. Second, we prefetch data blocks selectively according to the location of them and access patterns of them. Third, we moves destaged data from buffer cache to hard disk or flash memory considering the access patterns of block references. Trace-driven simulation shows that the proposed schemes enhance the buffer cache hit ratio by up to 29.9% and reduce the total I/O elapsed time by up to 49.5%.

N-gram based Language Model for the QWERTY Keyboard Input Errors in a Touch Screen Environment (터치스크린 환경에서 쿼티 자판 오타 교정을 위한 n-gram 언어 모델)

  • Ong, Yoon Gee;Kang, Seung Shik
    • Smart Media Journal
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    • v.7 no.2
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    • pp.54-59
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    • 2018
  • With the increasing use of touch-enabled mobile devices such as smartphones and tablet PCs, the works are done on desktop computers and smartphones, and tablet PCs perform laptops. However, due to the nature of smart devices that require portability, QWERTY keyboard is densely arranged in a small screen. This is the cause of different typographical errors when using the mechanical QWERTY keyboard. Unlike the mechanical QWERTY keyboard, which has enough space for each button, QWERTY keyboard on the touch screen often has a small area assigned to each button, so that it is often the case that the surrounding buttons are input rather than the button the user intends to press. In this paper, we propose a method to automatically correct the input errors of the QWERTY keyboard in the touch screen environment by using the n-gram language model using the word unigram and the bigram probability.

The Study on the Acceptable Intention of Smart and Mobile Device : Based on Two-Sided Network Effect (스마트 및 모바일 디바이스의 수용의도에 관한 연구 : Two-Sided 네트워크 효과를 중심으로)

  • Seo, Hyun-Sik;Song, In-Kuk
    • The KIPS Transactions:PartD
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    • v.18D no.4
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    • pp.287-298
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    • 2011
  • With the rage for Netbooks recently, Tablet PC and Smart phone users are rapidly increasing. Despite of the forecast that anticipates frequently practical use in various organizations and society, the comparison studies among the mobile devices rarely exist. The study examines the acceptable intention of the mobile devices, with which can replace traditional workstations and notebooks. UTAUT(Unified Theory of Acceptance and Use of Technology) was applied to the investigation of influencing factors for the acceptable intention, instead of the typical TAM(Technology Acceptance Model). The results illustrate that the significant differences of acceptable intention among the mobile devices occur based on two-side network effect even though some Smart phones share OSs and Apps with Tablet PCs and Netbooks.

A Study on the Decision Process for Adoption of Enterprise Endpoint Security solutions (기업용 Endpoint 보안솔루션 도입을 위한 의사결정 프로세스에 대한 연구)

  • Moon, Heoungkeun;Roh, Yonghun;Park, Sungsik
    • Journal of Information Technology and Architecture
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    • v.11 no.2
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    • pp.143-155
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    • 2014
  • In recent years, domestic electronics, banking, electricity, services, manufacturing, pharmaceutical, corporate type and malicious hackers is corporate security through the accident occurred and the resulting loss of corporate information and the damage each year is steadily increasing. Many companies have responded to domestic business activities and to protect critical information related to laptops, smart phones, tablets, and introduced a variety of Endpoint security solutions within. However, being introduced to senselessly Endpoint security solution across the over-budget, with the same features and performance, such as conflicts and problems arise, resulting in additional maintenance costs, in an effort to resolve the conflict in the operational security of the IT department's new difficulty in becoming. Here is the introduction and operation of these Endpoint security solutions in order to solve the problem on employees's PC into the center of the information security governance based on Endpoint security solution to provide the process for determining the solutions presented.

Hybrid Web-Based Real-Time Video Communication System (하이브리드 웹 기반의 실시간 화상통신 시스템)

  • Ban, Tae-Hak;Cho, Tae-Bum;Jung, Hoe-Kyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.5
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    • pp.1113-1118
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    • 2013
  • Real-time video communication technology of hybrid Web-based using JavaScript and HTML5 today is on the rise. Therefore, in this paper, we have studied the real-time videoo communication technology using a Web browser that supports HTML5. It has been designed and implemented a system based on HTML5 and JavaScript, allowing for video communication of real-time, such as you would using the HTTP/WebSockets and RTC API through the Web servers in the Web browser between different each other, utilizing a Web browser was. It is available in a usable terminal equipment of a Web browser PC or notebook, smart pad, such as a smart phone, which is available without installation, such as a plug-in register or another. In all environments the network is connected, it is available in all terminals use the Web browser is enabled, which will be utilized in the field of video communication in a restricted environment.

Process and Die Design of Square Cup Drawing for Wall Thickening (사각형 판재성형 시 벽두께 증육을 위한 금형 및 공정 설계)

  • Kim, Jinho;Hong, Seokmoo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.9
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    • pp.5789-5794
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    • 2015
  • Recently, thin and light-weight production technologies are needed in IT industry in accordance with increase of the smart phones and mobile PC products. In order to make light and high rigidity products, engineering plastic and aluminum materials are frequently used in products appearance and frame hat support structure. Especially aluminum extrusion and CNC Brick processes are widely used for high strength and high rigidity technology. But extrusion method has constraints to apply exterior design and CNC Brick process has relatively high production cost and low speed of manufacturing. In this research, a new process method is introduced in order to reduce material cost and to improve manufacturing speed dramatically. Plate forging process means basically that thickening of local wall area thickness after deform exterior shape by deep drawing and bending process. Therefore, it is possible to minimize the waste of material and the manufacturing time. In this study the process of plate forging is designed using finite element program AFDEX-2D and the thickness and the width of initial deformed blank. And it is verified as a sample which is a part of laptop developed through the proposed plate forging method.

Development of the Control Algorithm for the Small PEM Fuel Cell Stack (소형 PEM 연료전지 스택의 제어 알고리즘 개발)

  • Kim, Tae-Hoon;Choi, Woo-Jin
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.2
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    • pp.134-141
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    • 2010
  • Small PEM (Proton Exchange Membrane) fuel cell systems do not require humidification and have great commercialization possibilities. However, methods for controlling small PEM fuel cell stacks have not been clearly established. In this paper, a control method for small PEM fuel cell systems using a dual closed loop with a static feedforward structure is defined and realized using a DSP (Digital Signal Processor). The fundamental elements that need to be controlled in fuel cell systems include the supply of air and hydrogen, water management inside the stack, and heat management of the stack. For small PEM fuel cell stacks operated without a separate humidifier, fans are essential for air supply, heat management, and water management of the stack. A purge valve discharges surplus water from the stack. The proposed method controls the fan using double control loops to quicken transient response of the fan thereby improving the supply rate of air. Feedback control to compensate for the voltage change in fuel cell stack improves the response characteristics in fuel cell to load variations. The feasibility of proposed method was proved by the experiments with a 60W small PEM fuel cell system and operation of a notebook computer using this system.

Students' Perspectives towards M-learning Achievement, and Disposition towards Mathematics Using a mobile phone (Mobile-Learning에 의한 수학학습에서 학생들의 인식변화, 성취도, 및 성향에 대한 연구)

  • ChoiKoh, Sang-Sook
    • Communications of Mathematical Education
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    • v.23 no.3
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    • pp.863-885
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    • 2009
  • In the era of wireless internet, we are apt to use a mobile phone for learning mathematics, besides the pc computer and the notebook computer. This study was to investigate the effect of M-learning when students were given a wireless mobile phone in terms of their perspectives towards the use of a mobile phone, achievement and attitudes towards mathematics. They were the 3th grader in a high school, who were expected to take Aptitude Test for the entrance of the university level. The most students who took an ubiquitous environment of M-learning showed it as a benefit for learning mathematics and did not spend time at other activities such as listening to music, sending text-message, playing games, etc, but at the M-learning activities. The students who engaged in the M-learning activities were improved a significantly higher score at Aptitude Test than the students who took the make-up courses in the school and also did a significantly higher disposition towards mathematics which was caused by curiosity among 7 components of the mathematical disposition.

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Effect of Node Size on the Performance of the B+-tree on Flash Memory (플래시 메모리 상에서 B+-트리 노드 크기 증가에 따른 성능 평가)

  • Park, Dong-Joo;Choi, Hae-Gi
    • The KIPS Transactions:PartA
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    • v.15A no.6
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    • pp.325-334
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    • 2008
  • Flash memory is widely used as a storage medium for mobile devices such as cell phones, MP3 players, PDA's due to its tiny size, low power consumption and shock resistant characteristics. Additionally, some computer manufacturers try to replace hard-disk drives used in Laptops or personal computers with flash memory. More recently, there are some literatures on developing a flash memory-aware $B^+$-tree index for an efficient key-based search in the flash memory storage system. They focus on minimizing the number of "overwrites" resulting from inserting or deleting a sequence of key values to/from the $B^+$-tree. However, in addition to this factor, the size of a physical page allocated to a node can affect the maintenance cost of the $B^+$-tree. In this paper, with diverse experiments, we compare and analyze the costs of construction and search of the $B^+$-tree and the space requirement on flash memory as the node size increases. We also provide sorting-based or non-sorting-based algorithms to be used when inserting a key value into the node and suggest an header structure of the index node for searching a given key inside it efficiently.