• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.285-288
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• 1998

In this paper, we present mSROS(Micro-Scalable Realtime Operating System) to be applied commonly to the device controller systems in the HANbit ACE256 system. The device controller systems in HANbit ACE256 system are organized as many kinds of device controller. Applying modified PPOS(Peripheral Processor Operating System)which is an operating system for devices of the TDX-10 switching system to the firmwares for them, the inefficiency in development and maintenance exists inherently. To remove the inefficiency nd to improve the performqance of firmwares, we build a common operating system platform that including multi-tasking microkernel so that the firmwares among devices can acquire convenient development and cheap cost of maintencance. Especially, building a virtual machine as a development methodology, it is possible to remove dependency from the kernel so that any kinds of commercial real-time kernels can be used in mSROS as a basic kernel. The virtual machine in mSROS is compatible with the API of SROS(Scalable Realtime Operating System), PPOS, and CROS(Concurrent Realtime Operating System).

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권12호
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• pp.1209-1213
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• 2010

최근 모바일 장치의 기능이 발전하면서, 스마트폰에 대한 관심이 증가하고 있다. 스마트폰은 휴대성이라는 장점을 가지고 있음에도 불구하고, 그 기기의 크기가 작아 사용자 인터페이스 관점에서 불편함이 많이 있었다. 본 논문에서는 이 문제점올 해결하기 위해 안드로이드 모바일 플랫폼에서의 프레임버퍼 구조를 수정하여, 동적으로 해상 전환시켜 크기가 큰 외부 디스플레이 장치로 디스플레이를 전환하고, 기존의 휴대폰은 리모콘으로 활용할 수 있는 사용자 인터페이스 전환 기술을 개발하였다.

• 전기학회논문지
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• 제56권3호
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• pp.457-464
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• 2007

Micro-Grid comprising Micro-Sources supplying several $kW{\sim}MW$ power to local customers is environmentally friendly and reliable. This paper deals with the development of simulation models of Micro-Grid on the PSCAD/EMTDC platform for analyzing various aspects of the interaction of the Micro-Grid. The developed switching level model adopts the space vector PWM. Both switching level and power frequency Micro-Source models are developed, which shows that power frequency modeling is sufficient for analyzing the phenomena of interest. Control characteristics of the Micro-Sources with the parameter and load power variation are analyzed for power quality enhancement. The simulation results show that the developed models are effective for studying Micro-Grid.

• 한국산학기술학회논문지
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• 제8권2호
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• pp.201-206
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• 2007

본 논문에서는 NoC(Network-on Chip) 구조로 구현된 core-based 시스템에 대한 효율적인 저전력 테스트 방법을 제안한다 NoC의 라우터 채널로 전송되는 테스트 데이터의 전력소모를 줄이기 위해서 스캔 벡터들을 채널 폭만큼의 길이를 갖는 flit으로 분할하고 nit간 천이율(switching rate)이 최소화 되도록 don't care 입력을 할당하였다. ISCAS 89 벤치마크에 대하여 실험을 한 결과, 제안된 방법은 약 35%의 전력 감소를 나타내었다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2012년도 춘계학술발표대회
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• pp.67.2-67.2
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• 2012

Graphene is expected to have a significant impact in various fields in the foreseeable future. For example, graphene is considered to be a promising candidate to replace indium tin oxide (ITO) as transparent conductive electrodes in optoelectronics applications. We report the tunability of the wavelength of localized surface plasmon resonance by varying the distance between graphene and Au nanoparticles [1]. It is estimated that every nanometer of change in the distance between graphene and the nanoparticles corresponds to a resonance wavelength shift of ~12 nm. The nanoparticle-graphene separation changes the coupling strength of the electromagnetic field of the excited plasmons in the nanoparticles and the antiparallel image dipoles in graphene. We also show a hysteresis in the conductance and capacitance can serve as a platform for graphene memory devices. We report the hysteresis in capacitance-voltage measurements on top gated bilayer graphene which provide a direct experimental evidence of the existence of charge traps as the cause for the hysteresis [2]. By applying a back gate bias to tune the Fermi level, an opposite sequence of switching with the different charge carriers, holes and electrons, is found [3]. The charging and discharging effect is proposed to explain this ambipolar bistable hysteretic switching.

• International Journal of Internet, Broadcasting and Communication
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• 제14권1호
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• pp.105-115
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• 2022

The platform for displaying cars has been changing with the times. From the popularity of paper media to the rise of computer graphics, the improvement of technology has brought more space and possibilities to the automotive industry. Yiming Zhong proposed the workflow of car configurator through Unreal Engine 4 to implement the basic functions of configuration in 2021, according to Yiming Zhong's final presentation, there is still room to improve the realism of graphics and functionality of the car configurator. Therefore, in this paper we propose to upgrade the car shaders and lighting environments according to the real-world physics and add multi-scenes switching function to car configurator. However the multi-scenes switching function also brings a large amount of data, which leads to the problem of display lag. At the end of the paper, we use the level of details(LOD) process to reduce the amount of data for real-time computing in Unreal Engine 4 and the increase of frames per second(FPS) values verifies the feasibility of our optimization solution.

• 조명전기설비학회논문지
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• 제21권9호
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• pp.81-86
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• 2007

Electric utility companies have the responsibility of providing good electricity for their customers. They have introduced the DAS(Distribution Automation System) to automate the power distribution networks. DAS engineers require state-of-the-art applications, such as a way to actively manage the distribution system and gain economic benefits from a flexible DAS architectural design. The existing DAS is not capable of handling these needs. It requires operator intervention whenever feeder overloading is detected while operator error could cause the feeder overload area to be extended. It also utilizes a closed architecture and it is therefore difficult to meet the system migration and future enhancement requirements. This paper represents a web based, platform-independent, flexible DAS architectural design and active database application. Recent advanced Internet technologies are fully utilized in this new DAS architecture allowing it to meet the system migration and future enhancement requirements. By using an active database, the DAS can minimize the feeder overloading area in the distribution system without operator intervention, thereby minimizing mistakes due to operator error.

• 만화애니메이션 연구
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• 통권14호
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• pp.151-164
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• 2008

크로스 플랫폼게임은 게임시장의 수평적, 수직적 시장확장을 유도하여, 기존 게임시장의 게임소비를 개방화 시키는데 필요한 기술적 혁신을 가져오고 있다. 결국 이러한 기술적 진화모델은 오프라인과 온라인의 게임서비스를 통합하여, 시간과 장소에 구애받지 않고, 언제 어디서나 최적의 게임서비스를 즐길 수 있도록 게임환경을 구축하여, 고착화된 소비연렁대와 한정적인 소비시간의 한계성을 극복하고, 지속적인 게이머의 시장진입을 유도하는 기제가 되고 있다. 크로스플랫폼게임엔진이 보여주는 디지털콘텐츠 기술진화의 모델은 동일한 콘텐츠를 다양한 플랫폼에 동시공급하게 될 때, 모든 플랫폼간의 쌍방향 서비스가 극대화될 수록 이에 따르는 각 플랫폼 간 데이터의 지정과 배당, 전환과 표준화, 그리고 이에 연계되는 플랫폼별 맞춤형 데이터 분할전송기술의 점진적 혁신이 필요하게 되는 것이다. 동일한 콘텐츠를 다양한 플랫폼에 최대한 배급하는 것이 수용자시장의 효율성과 콘텐츠 수익성을 극대화시키는 전략이 될 수 있지만, 현재와 같이 일방향 서비스의 경우가 아닌, 완전한 쌍방향 서비스의 네트워크가 점진적으로 진행된다면, 이에 따르는 상호간 네트워크의 데이터 전환 및 배급기술이 차별적인 엔진기술로 개발되어져야 최적의 디지털서비스가 구현될 수 있다는 것이다. 차세대 디지털콘텐츠시장의 선도기업은 소비환경의 최적화를 쌍방향 네트워크 서비스 내에서 조기에 구현할 수 있도록 구조화하는 네트워크엔진기술의 선도적 지위를 우선적으로 선점해야 한다.

• 대한치과의사협회지
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• 제55권11호
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• pp.766-776
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• 2017

This clinical study was conducted to evaluate the clinical effects of a concave neck of external connection type implant fixture designed for platform switching on the peri-implant tissue responses. Two types of implants with different neck designs were implanted in 20 patients. For the experimental group, the bioseal(BS) implant fixtures with 's' shaped concave profile on the neck were used, and non-bioseal(NBS) implant fixtures with a straight profile on the neck were used as control(Total of 40 implants, NBS: n = 19, BS: n=21). During the one-year period after implant placement, implant survival rate, marginal bone resorption, bleeding, plaque, and complications were evaluated. The survival rate of NBS and BS group was 94.74% and 90.48%, respectively. There was no significant difference on marginal bone resorption, bleeding and plaque between the two groups (P>.05). Within the limits of the present study, implants with a concave neck design showed similar clinical results to implants with a straight neck design on the peri-implant tissue responses. Longitudinal clinical studies are necessary to confirm more effective clinical results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1511_1512
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• 2009

This paper presents a polarization switching antenna integrated with silicon RF MEMS SPDT switches in the form of a package. A low-loss quartz substrate made of SoQ (silicon-on-quartz) bonding is used as a dielectric material of the patch antenna, as well as a packaging lid substrate of RF MEMS switches. The packaging/antenna substrate is bonded with the bottom substrate including feeding lines and RF MEMS switches by BCB adhesive bonding, and RF energy is transmitted from signal lines to antenna by slot coupling. Through this approach, fabrication complexity and degradation of RF performances of the antenna due to the parasitic effects, which are all caused from the packaging methods, can be reduced. This structure is expected to be used as a platform for reconfigurable antennas with RF MEMS tunable components. A linear polarization switching antenna operating at 19 GHz is manufactured based on the proposed method, and the fabrication process is carefully described. The s-parameters of the fabricated antenna at each state are measured to evaluate the antenna performance.