• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2004년도 하계종합학술대회 논문집(2)
• /
• pp.375-378
• /
• 2004

In this paper, we fabricated pantacene TFTs using PVP copolymer and cross-linked PVP as gate insulator on glass and plastic (PET) substrate. Depending on the density of PVP and poly (melamine-co-formaldehyde) the performance has been changed. We obtained the best performance with the mobility of 0.12cm2/V sec and the on/off current ratio of $1.19{\times}10^6$ for the case of $10wt\%$ PVP copolymer mixed with $5wt\%$ poly(melamine-co-formaldehyde). Additionally using OTFTs with the above PVP gate insulator, we fabricated the integrated circuit including inverter which produced the gain of 5.56 on the glass substrate and gain of 9.7 on the plastic (PET) substrate. And the threshold voltage was respectively +8V and +14v$ldots$

• 한국컴퓨터정보학회논문지
• /
• 제22권9호
• /
• pp.91-97
• /
• 2017

IoT (Internet of Things) systems are based on heterogeneous hardware systems of different types of devices interconnected each other, ranging from miniaturized and low-power wireless sensor node to cloud servers. These IoT systems composed of heterogeneous hardware utilize data sets collected from a particular set of sensors or control designated actuators when needed using open APIs created through abstraction of devices' resources associated to service applications. However, previously existing IoT services have been usually developed based on vertical platforms, whose sharing and exchange of data is limited within each industry domain, for example, healthcare. Such problem is called 'data silo', and considered one of crucial issues to be solved for the success of establishing IoT ecosystems. Also, IoT services may need to dynamically organize their services according to the change of status of connected devices due to their mobility and dynamic network connectivity. We propose a way of dynamically composing IoT services under the concept of WoT (Web of Things) where heterogeneous devices across different industries are fully integrated into the Web. Our approach allows developers to create IoT services or mash them up in an efficient way using Web objects registered into multiple standardized horizontal IoT platforms where their resources are discoverable and accessible. A Web-based service composition tool is developed to evaluate the practical feasibility of our approach under real-world service development.

• 한국게임학회 논문지
• /
• 제17권5호
• /
• pp.39-50
• /
• 2017

본고는 모바일 미디어의 이동성을 중심으로 모바일 게임 플랫폼의 개념과 게임하기의 변화를 살피고, 모바일 매개의 시간 변수를 통해 재구조화된 모바일 게임의 텍스트를 역할수행 게임을 중심으로 분석한다. 이동하는 존재로서 플레이어는 모바일 미디어를 통해 게임 플랫폼과 결합한다. 모바일 미디를 통해 매개된 일상의 시간은 중첩된 시간으로 재구성되며, 모바일 게임 플랫폼에서 플레이에 영향을 미친다. 모바일 역할수행 게임의 캐릭터는 사건을 경험하는 아바타가 아닌 플레이어가 머무르는 플레이 거점이 되며, 이는 거주의 공간이 아닌 이동 중 거주의 공간으로서 비장소적 특성을 가진다. 자동전투는 비경험한 전투를 명시적 통합체의 형태로 반복 재생한다. 중첩된 시간에서 전투의 경험은 시각적 스펙터클로서 기능하며, 플레이어로 하여금 기경험한 전투들을 환기시킨다.

• 한국콘텐츠학회논문지
• /
• 제6권7호
• /
• pp.50-57
• /
• 2006

대표적인 개인용 단말기인 휴대폰은 하드웨어의 독립성을 확보할 수 있는 WIPI라는 새로운 플랫폼으로 표준화되고 있어 응용 개발의 가속도를 더하고 있다. 본 논문에서는 이메일과 아바타를 접목시켜 사용자가 이메일을 보내고 받는데 있어서 아바타를 통해 자신을 나타내 보일 수 있도록 WIPI 기반으로 구현하였고, 또한 일반적인 이메일 응용 프로그램들이 이메일과 일정 관리 프로그램을 같이 가지고 있듯이, 본 논문에서도 일정 관리 프로그램을 이메일과 통합하여 쓸 수 있도록 구현하였다. 이 구현 프로그램의 유용성을 더하기 위해, 일정을 통보하기 위한 방법으로 SMS 문자 서비스를 이용하였고, 휴대폰에서 입력한 일정을 PC 기반의 Microsoft Outlook의 일정과 동기화 할 수 있도록 개발하였다.

• 한국재료학회지
• /
• 제18권9호
• /
• pp.507-510
• /
• 2008

Electrical properties of multi-channel metal-induced unilaterally precrystallized polycrystalline silicon thin-film transistor (MIUP poly-Si TFT) devices and circuits were investigated. Although their structure was integrated into small area, reducing annealing process time for fuller crystallization than that of conventional crystal filtered MIUP poly-Si TFTs, the multi-channel MIUP poly-Si TFTs showed the effect of crystal filtering. The multi-channel MIUP poly-Si TFTs showed a higher carrier mobility of more than 1.5 times that of the conventional MIUP poly-Si TFTs. Moreover, PMOS inverters consisting of the multi-channel MIUP poly-Si TFTs showed high dynamic performance compared with inverters consisting of the conventional MIUP poly-Si TFTs.

• ETRI Journal
• /
• 제27권2호
• /
• pp.133-139
• /
• 2005

A monolithic microwave integrated circuit (MMIC) chip set consisting of a power amplifier, a driver amplifier, and a frequency doubler has been developed for automotive radar systems at 77 GHz. The chip set was fabricated using a 0.15 ${\mu}$ gate-length InGaAs/InAlAs/GaAs metamorphic high electron mobility transistor (mHEMT) process based on a 4-inch substrate. The power amplifier demonstrated a measured small signal gain of over 20 dB from 76 to 77 GHz with 15.5 dBm output power. The chip size is 2mm${\times}$ 2mm. The driver amplifier exhibited a gain of 23 dB over a 76 to 77 GHz band with an output power of 13 dBm. The chip size is 2.1mm${\times}$ 2mm. The frequency doubler achieved an output power of -6 dBm at 76.5 GHz with a conversion gain of -16 dB for an input power of 10 dBm and a 38.25 GHz input frequency. The chip size is 1.2mm ${\times}$ 1.2mm. This MMIC chip set is suitable for the 77 GHz automotive radar systems and related applications in a W-band.

• International journal of advanced smart convergence
• /
• 제5권1호
• /
• pp.1-7
• /
• 2016

Recently, introduced a cloud computing technology to the IT industry, smart phones, it has become possible connection between mobility terminal such as a tablet PC. For dissemination and popularization of movable wireless terminal, the same operation have focused on a viable mobile cloud in various terminal. Also, it evolved Wireless Sensor Network(WSN) technology, utilizing a Body Sensor Network(BSN), which research is underway to build large Ubiquitous Sensor Network(USN). BSN is based on large-scale sensor networks, it integrates the state information of the patient's body, it has been the need to build a managed system. Also, by transferring the acquired sensor information to HIS(Hospital Information System), there is a need to frequently monitor the condition of the patient. Therefore, In this paper, possible sensor information exchange between terminals in a mobile cloud environment, by integrating the data obtained by the body sensor HIS and interoperable data DBaaS (DataBase as a Service) it will provide a base of mBodyCloud System. Therefore, to provide an integrated protocol to include the sensor data to a standard HL7(Health Level7) medical information data.

• 한국군사과학기술학회지
• /
• 제12권3호
• /
• pp.333-343
• /
• 2009

Tactical Information Communication Network(TICN) is a concept-type integrated Military Communication system that enables precise command control and decision making by unifying the diversified military communication network and conveying diverse range of battle field information on real-time, at right place at right time. TICN is designed to advance into high speed, large capacity, long distance wireless relay transmission. To support mobility in battlefield environments, the application of Ad-hoc networking technology to its wireless communication has been examined. Ad-hoc network is consist of mobile nodes and nodes in the network depends on the cooperation of other nodes for forwarding of packets. In this context, some non-cooperating nodes may delay forwarding of packets or drop the packets. This may hamper the network as a whole and disrupt communication between the cooperating nodes. To solve this problem, we present a solution with a Node Weight Management Server(NWMS), which manages each node's weight according to its behavior in local area. When the NWMS detects misbehaving node, it increases the node's weight. If the node's weight exceeds a predefined threshold then the NWMS broadcasts the node's information into network to isolate the misbehaving node from the network. These mechanisms show that they are highly effective and can reliably detect a multitude of misbehaving node.

• Journal of information and communication convergence engineering
• /
• 제15권2호
• /
• pp.112-116
• /
• 2017

In this work, we demonstrated a low noise and high linearity low noise amplifier (LNA) monolithic microwave integrated circuit (MMIC) with novel active bias circuit for LTE applications. The device technology used in this work relies on a process involving a $0.25-{\mu}m$ GaAs pseudomorphic high electron mobility transistor (PHEMT). The LNA MMIC with a novel active bias circuit has a small signal gain of $19.7{\pm}1.5dB$ and output third order intercept point (OIP3) of 38-39 dBm in the frequency range 1.75-2.65 GHz. The noise figure (NF) is less than 0.58 dB over the full bandwidth. Compared with the characteristics of the LNA MMIC without using the novel active bias circuit, the OIP3 is improved about 2-3 dBm. The small signal gain and NF showed no significant change after using the active bias circuit. The novel active bias circuit indeed improves the linearity performance of the LNA MMIC without degradation.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2002년도 ITC-CSCC -2
• /
• pp.1054-1057
• /
• 2002

The design and fabrication of Q-band 3-stage monolithic microwave integrated circuit(MMIC) amplifier for WLAN are presented using 0.2$\square$ AIGaAs/lnGaAs/GaAs pseudomorphic high electron mobility transistor (PHEMT). In each stage of the MMIC, a negative feedback is used for both broadband and good stability. The measurement results are achieved as an input return loss under -4dB, an output return loss under -10dB, a gain of 14dB, and a PldB of 17dBm at Q-band(36～44GHz). These results closely match with design results. The chip size is 2.8${\times}$1.3mm$^2$. This MMIC amplifier will be used as the unit cell to develop millimeter-wave transmitters for use in wideband wireless LAN systems.