• Journal of Information Technology Applications and Management
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• v.20 no.4
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• pp.151-164
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• 2013

According to the development of smart technologies such as smart phones, tablet PC, and SNS communication, the necessity of smart work that can change the working environments in organizations has been emphasized. However, while there are many organizations that wish to adopt smart technologies, there are those that have been skeptical until now about its potential success. Leaders may especially have different viewpoints concerning the efficacy and effectiveness of smart work depending on the industries, characteristics of the work, etc. Therefore, this research looks to investigate whether there may be differences between leaders (manager, project manager, supervisor, etc.) and non-leaders (team member, staff, etc.) group in accepting smart working through empirical and exploratory approaches.

• Journal of Information Technology Applications and Management
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• v.20 no.4
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• pp.19-31
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• 2013

There is tremendous increasing demand on spectrum resource which is boosted by spread of cloud computing and M2M telecommunication as well as smart phone and tablet PC. Recently, spectrum sharing technology has drawn attention to the spectrum policy makers as a promising way to overcome limitation of scarce spectrum resource. To succeed in commercialization of spectrum sharing technology, it is necessary to prospect the future business ecosystem of spectrum sharing and develop appropriate policies and laws at the same time along with the advance of spectrum sharing technology. The purpose of this paper is to prospect future spectrum sharing ecosystem and analyze business ecosystem of spectrum sharing with casual loop map. With the causal map and system dynamics method, it is possible to analyze feedback loops which is not limited to linear thinking and build policies which optimize positive dynamics in business ecosystem of spectrum sharing.

• Information and Communications Magazine
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• v.32 no.3
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• pp.69-76
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• 2015

무선랜(Wireless LAN)으로도 불리는 Wi-Fi 기술은 1997년 IEEE 802.11 전송 규격(Legacy Standard)이 출간된 이후 지속적인 보완과 개정 작업을 통해 그 규격이 발전되어 가며 스마트폰, Tablet, Note-PC 등 개인 휴대 단말 기기를 위한 데이터 네트워크의 필수적인 구성 요소가 되었다. IEEE 표준과 별도로 표준 인증기관인 Wi-Fi Alliance를 통하여 제품 간 무선연결 호환성의 확보 뿐 아니라 Wi-Fi 기반 서비스 규격 제정에 이르기까지 Wi-Fi 표준 작업이 수행되고 있다. 본고에서는 나날이 발전해 온 Wi-Fi 기술 표준을 전송 속도 향상 측면과 주파수 대역 확장 측면에서 살펴보고, 차세대 Wi-Fi 기술인 IEEE 802.11ax, 즉 HEW(High Efficiency WLAN) 표준에 대하여 살펴보도록 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.683-686
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• 2011

1970년대 라디오 주파수를 사용하여 컴퓨터 통신 네트워크가 구축된 이후 눈부신 발전을 거듭하여 Personal Computer 뿐만 아니라 Mobile이나 Tablet PC등에서도 인터넷이 가능하다. 이렇게 다양한 매체를 통해 인터넷을 사용함에 따라 보안에 대한 중요성이 높아지고 있다. 하지만 최근 현대 캐피탈이나 농협, 네이트와 같은 해킹 사례를 보면 평문 데이터 사용에 의해 피해가 더욱 확대 되었다. 평문 데이터 사용함에 따라 보안 위협이 커지는데 평문 데이터를 사용하는 이유를 암호화를 사용했을 때보다 QoS 하락 때문이라고 볼 수있다. 이를 해결하기 위해 고정된 인프라에서 잉여 자원인 GPU를 사용하여 암호화를 할 때 QoS 하락을 줄일 수 있을 것이다. 또한 CPU보다는 멀티코어를 사용한 병렬 처리를 활용하여 CPU보다 상대적으로 효율적인 암호화가 가능하다고 생각한다. 본 논문에서는 CPU를 이용한 암호화 처리 속도와 GPU를 이용한 암호화 처리 속도를 비교하여 GPU를 이용한 암호화 처리 가능성을 검토하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.21-22
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• 2011

The growth of using smartphone and tablet pc has enabled variety kinds of realtime applications. In these applications, the data which we called data stream is multidimensional, continuous, rapid, and time-varying. However the traditional Database Management System (DBMS) suffers from processing the real time and complex application, in this paper we proposed the framework for CCR Data Stream Server's design and implementation that compiled with Data Stream Database Management System (DSMS) and DBMS in EMR system. The system enables users not only to query stored CCR information from DBMS, but also to execute continues query for the real-time CCR Data Stream.

• Annual Conference of KIPS
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• 2011.11a
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• pp.1498-1501
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• 2011

스마트폰 시장의 성장 그리고 스마트폰 시장 내의 안드로이드 시장이 급성장함에 따라 안드로이드 기반의 다양한 앱에 대한 수요가 많아지고 있다. 그중에서도 안드로이드 앱에 대한 수요는 기하급수적으로 증가 하고 있다. 또한 스마트폰뿐만 아니라 타블릿PC 시장도 성장하면서 타블릿PC 앱에 대한 수요도 증가하고 있다. 하지만 타블릿PC 전용 앱의 개발은 아직 미흡하다. 본 논문에서는 안드로이드 타블릿PC 기반으로 스케줄링과 가계부를 지원하는 시스템의 설계 및 구현에 대한 내용을 기술한다. 또한 Android의 강점인 Google 계정과의 Synchronization을 통해 PC와 타블릿PC에서의 스케줄 관리를 할 수 있으며 자체적으로 만든 서버를 통하여 공공일정을 자신이 원하는 항목을 선택하여 다운로드하여 관리 할 수 있다. 가계부는 수입과 지출을 관리하고 그래프를 통하여 자신이 어느 정도로 사용을 하였는가를 확인할 수 있다.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.11
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• pp.48-55
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• 2016

Ambient-light sensor system, which changes the brightness of a display as ambient light change, was studied to reduce the power consumption of the mobile applications such as note PC, tablet PC and smart phone. The ambient-light sensor system should be integrated on a display panel to improve the complexity and cost of mobile applications, so the ambient-light sensor and readout circuit was integrated on a display panel using low-temperature poly-silicon thin film transistors (LTPS-TFT). We proposed the new compensation method to correct the panel-to-panel variation of the ambient-light sensors, without additional equipment. We designed and investigated the new readout circuit with the proposed compensation method and the analog-to-digital converter for the final digital output of ambient light. The readout circuit has very simple structure and control timing to be integrated with LTPS-TFT, and the input luminance ranges from 10 to 10,000 lux. The readout rate is 100 Hz, and maximum differential non-uniformity with 20 levels of the final output below 0.5 LSB.

• Journal of Digital Convergence
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• v.11 no.6
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• pp.43-55
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• 2013

This study was to examine the operation strategy of terrestrial broadcasting system on channel image and N-screen service. Nowadays, terrestrial broadcasting system provides video streaming service based on internet. In other words, terrestrial broadcasting system provides N-screen service through TV-PC-Smart phone-Tablet PC. But it is different for terrestrial broadcasting system to analysis the choice criterion of program. Only, channel image of terrestrial broadcasting system expanded into N-screen. Finally, channel image of terrestrial broadcasting system is the competition strategy. It is necessary for terrestrial broadcasting system to prepare the strategy of program choice for users, original contents, new platform and service in connection with N-screen.

• Journal of Digital Convergence
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• v.9 no.2
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• pp.131-140
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• 2011

As the recent advances in network and wireless communications and semiconductor design and process technologies, our computing platform is rapidly shifting from desktop PCs to mobile devices such as UMPC (Ultra Mobile PC), Tablet PC, and Smartphone. Especially, wide-spreading Smartphones allow a new field of application based on location based services available with an user interface called augmented reality (AR). Therefore, this paper introduces an implementation of AR using various OpenAPls on Android Smartphones. In order to utilize enrich user data in real time, the system integrates with location based social network services also with OpenAPI. These APIs enable third-party developers to make use of rich contents of many portal web sites. The prototype was implemented on the real Android phone, Sky Sirius, and the result shows that it can provide an efficient location based service using AR technology without any constraints on mobile devices; in addition, it connects SNS to AR for sharing user data including photos, videos, and messages based on a specific location.

• KIPS Transactions on Computer and Communication Systems
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• v.3 no.4
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• pp.125-128
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• 2014

OpenGL ES(OpenGL for Embedded System) 2.0 is one of the most widely used 3D graphics API(application progrma interface) standard for smart phones and tablet PCs at this time. During programming with this API, they prefer desktop environment rather than the target mobile environment, which has relatively low computing power. Thus, we need to emulate the OpenGL ES 2.0 API on the desktop PCs, where only OpenGL API libraries are available. In this paper, we present technical difficulties and their solutions to emulate OpenGL ES 2.0 on desktop PCs. Our final implementation of OpenGL ES 2.0 emulation library works on desktop PCs and passed over more than 96% of the official CTS(conformance test suites) to prove the correctness of our implementation. Additionally, for the commercially available benchmark programs, our implementation shows equivalent execution speeds to the previous commercial OpenGL ES 2.0 implementations.