• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.555-557
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• 2021

스마트폰이 널리 보급되면서 QR코드는 새로운 트렌드로 주목받고 있다. 많은 기업에서 QR코드를 활용하여 마케팅을 하고 있으며 QR코드는 사람들에게 친숙한 이미지가 되었다.. 이에 본 논문에서는 기존의 기업에서 서비스중인 인터폰을 통한 종업원과 소비자의 주문 구조방식의 Drive-Thru가 아닌 QR코드를 활용한 비대면 주문방식의 Drive-Thru 제공을 목적으로 한다. 이러한 서비스를 통하여 기존의 Drive-Thru를 이용 시 불편했던 의사소통, 정보부족을 소비자에게 효과적인 서비스로 제공할수 있고 기업에서는 기존의 Drive-Thru에 배치되어 있던 노동력을 효율적으로 사용하여 능률을 증가시킬 수 있는 기대효과를 가진다.

• Digital Contents
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• no.7 s.158
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• pp.112-115
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• 2006

내가 누구인지 말할수 있는 자는 누구인가. 문학에서는 내가 누구인지 스스로 말할수 없어도 큰 문제가 되지 않지만 브랜드에서는 아니다. 내가 누구인지 스스로 말할 수 없다면 아무도 말할 수 없게 된다. 그렇다. 우선 내가 말해야 한다. 내가 누구인지는 내가 무슨 일을 하는가(I am what I do)에 달려 있다. 내가 하는 일이 무엇인지, 어떤 고유한 존재의 의미를 가지는지 미션으로 말하라. 이는 모든 브랜드와 브랜드를 둘러싼 모든 활동의 출발점이다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.2
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• pp.47-53
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• 2018

Nowadays, additive manufacturing (AM) technology is a promising process to fabricate complex shaped devices applied in medical and dental services. Among the AM processes, a DLP (digital light processing) type 3D printing process has some advantages, such as high precision, relatively low cost, etc. In this work, we propose a simple method to fabricate precise dental models using a DLP 3D printer. After 3D printing, a part is commonly post-cured using secondary UV-curing equipment for complete polymerization. However, some shrinkage occurs during the post-curing process, so we adaptively control the UV-exposure time on each layer for over- or under-curing to change the local shape-size of a part in the DLP process. From the results, the shrinkage amounts in the post-curing process vary due to the UV-dose in 3D printing. We believe that the proposed method can be utilized to fabricate dental models precisely, even with a change of the 3D CAD model.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.257-261
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• 2008

The Digital Radio Mondiale (DRM) system is a digital broadcasting standard designed for use in the LF, MF and HF bands of the broadcasting bands below 30 MHz. The system provides both superior audio quality and improved user services / operability compared with existing AM transmissions. In this paper, we propose a variable point Prime Factor FFT design method for Digital Radio Mondiale (DRM) system. Proposed method processes a various size IFFT/FFT of Robustness Mode on DRM standard efficiently by composing Radix-Prime Factor FFT Processing Unit of form similar to Radix-4 by insertion of a variable Prime Factor Twiddle Factor and Garbage data. So, we improved limitation that cannot process 112/176/256/288 FFT of each mode of DRM system with a existent Radix Processor and increase memory size and memory access time for IFFT/FFT processing by software processing in case of implementation with a existent high speed DSP.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.581-582
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• 2020

본 논문에서는 블루투스 비콘을 활용하여, 학생의 통학차량에서 일어날 수 있는 사고를 미연에 방지하며, 실시간 안전을 확인 할 수 있는 서비스를 블루투스, 스마트폰 응용 서비스 플랫폼, 안드로이드 애플리케이션 등을 활용하여서 기존에 문제점을 보완하는 것과 함께 안전성을 강조하기 위해 블루투스 비콘를 활용한 생활밀착형 ICT 서비스 설계 및 구현을 제안 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.579-580
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• 2020

본 논문에서는 승강기를 이용할 때의 위험 요소와 불편함이 최소화된 서비스를 제공하기 위한 가상 승강기 도어 자동 센싱 시뮬레이션을 제안한다. 이 프로그램은 실제 서비스를 이용하는 듯한 가상의 승강기 테스트 환경을 제공함으로써 개발 시간을 줄이고, 설계의 정합성을 높여준다. 또한, 아두이노 기반의 승강기 도어 제어기 디바이스 펌웨어와 구현된 스마트 버튼 펌웨어를 블루투스로 연결하고, 가상 시뮬레이션 프로그램에 연동시킨다. 이때, 연동된 오픈소스 센서는 참여 연구원들의 다양한 코딩 응용을 가능하게 해준다. 본 논문에서는 코딩을 통해 구현된 결과를 시뮬레이션 함으로써 연구원들의 창의성을 향상시키고 효과검증을 통한 성취를 도출한다.

• Journal of Astronomy and Space Sciences
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• v.27 no.3
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• pp.221-230
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• 2010

A 4+12+16 amplitude phase shift keying (APSK) modulation outperforms other 32-APSK modulations in a nonlinear additive white Gaussian noise (AWGN) channel because of its intrinsic robustness against AM/AM and AM/PM distortions caused by the nonlinear characteristics of a high-power amplifier. Thus, this modulation scheme has been adopted in the digital video broadcasting-satellite2 European standard. And it has been considered for high rate transmission of telemetry data on deep space communications in consultative committee for space data systems which provides a forum for discussion of common problems in the development and operation of space data systems. In this paper, we present an improved bits-to-symbol mapping scheme with a better bit error rate for a 4+12+16 APSK signal in a nonlinear AWGN channel and propose a simple signal detection algorithm for the 4+12+16 APSK from the presented bit mapping.

• Journal of electromagnetic engineering and science
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• v.14 no.2
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• pp.68-73
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• 2014

A linear stacked field-effect transistor (FET) power amplifier (PA) is implemented using a $0.18-{\mu}m$ silicon-on-insulator CMOS process for W-CDMA handset applications. Phase distortion by the nonlinear gate-source capacitance ($C_{gs}$) of the common-source transistor, which is one of the major nonlinear sources for intermodulation distortion, is compensated by employing a PMOS linearizer with improved AM-PM. The linearizer is used at the gate of the driver-stage instead of main-stage transistor, thereby avoiding excessive capacitance loading while compensating the AM-PM distortions of both stages. The fabricated 836.5 MHz linear PA module shows an adjacent channel leakage ratio better than -40 dBc up to the rated linear output power of 27.1 dBm, and power-added efficiency of 45.6% at 27.1 dBm without digital pre-distortion.

• The Journal of Korean Academy of Prosthodontics
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• v.57 no.4
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• pp.483-489
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• 2019

With development of digital dentistry, the 3-dimensional (3D) manufacturing industry using computer-aided design and computer-aided manufacturing (CAD/CAM) has grown dramatically in recent years. Denture fabrication using digital method is also increasing due to the recent development of digital technology in dentistry. The 3D manufacturing process can be categorized into 2 types: subtractive manufacturing (SM) and additive manufacturing (AM). SM, such as milling is based on cutting away from a solid block of materal. AM, such as 3D printing, is based on adding the material layer by layer. AM enables the fabrication of complex structures that are difficult to mill. In this case, additive manufacturing method was applied to the fabrication of the resin-based complete denture to a 80 year-old patient. During the follow-up periods, the denture using digital method has provided satisfactory results esthetically and functionally.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2002.04a
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• pp.550-555
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• 2002

In this paper, it is presented a new technique to the design and real-time implementation of fuzzy control system based-on digital signal processors in order to improve the precision and robustness for system of industrial robot. Fuzzy control has emerged as one of the most active and fruitful areas for research in the applications of fuzzy set theory, especially in the real of industrial processes. In this thesis, a self-organizing fuzzy controller or the industrial robot manipulator with a actuator located at the base is studied. A fuzzy logic composed of linguistic conditional statements is employed by defining the relations of input-output variable of the controller, In the synthesis of a FLC, one of the most difficult problems is the determination of linguistic control rules from the human operators. To overcome this difficult, SOFC is proposed for a hierarchical control structure consisting of basic level and high level that modify control rules.