• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.128-130
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• 2016

온라인 콘텐츠와 모바일 단말기의 대중화에 따라 국내 디지털 콘텐츠 산업은 높은 성장률을 보이면서 빠르게 발전하고 있다. 본 연구에서는 DEA 모형을 이용하여 온라인 디지털 콘텐츠 산업의 기술적 효율성을 측정하고 효율성 제고를 위한 시사점을 모색한다. 실증분석을 위한 투입요소로는 업종별 사업체수와 종사자수를 사용하였고, 산출요소로는 총매출액을 사용하였다. 실증분석 결과, 온라인 디지털 콘텐츠 산업의 기술적 효율성은 상당히 낮은 수준인 것으로 나타났으며 이는 주로 규모의 비효율성에 기인한 것으로 분석되었다. 이와 같은 결과는 기술혁신역량을 강화하기 위한 산업성장전략 추진이 필요함을 시사하는 것으로 향후 온라인 디지털 콘텐츠 산업의 경쟁력 제고에 도움이 되는 실질적인 참고자료로 활용될 것으로 기대된다.

• 디지털융복합연구
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• 제19권2호
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• pp.195-202
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• 2021

본 연구에서는 장기적 관점에서 지적좌표 세계측지계 변환성과를 도해 및 수치지역의 지적공부에 단계적으로 적용·활용하기 위한 방안을 제시하고자 하였다. 현재 추진되고 있는 지적좌표의 세계측지계 변환성과는 변환 전후 면적의 차이가 불규칙적으로 발생하고 있는 사례가 있었다. 또한 지적불부합 지역의 변환 오차의 누적 및 지적기준점에 대한 세계측지계 성과취득 기간이 부족한 것으로 나타났다. 연구에서는 이러한 문제의 해결을 위해, 2020년말까지 1차적으로 세계측지계 변환이 완료된 도면에 대해서는 연속지적도 등의 고도화를 통해 공간정보 및 관련 분야에 제공하는 방안을 제시하였다. 그리고 지적측량 목적으로 사용되는 도면은 도해지역과 수치지역의 특성에 부합하도록 장기적으로 수치형태로 지적공부에 적용하는 방향으로 개선방안을 제시하였다. 세계측지계 변환성과를 도해 및 수치지역을 구분해 적용 및 활용함으로써 보다 안정적인 지적공부의 반영이 기대된다.

• 한국IT서비스학회지
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• 제19권6호
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• pp.15-29
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• 2020

Facing the era of intelligence, the demands for changes of e-Government system appears to be rising upon the development of AI, VR, IoT and other new technologies. However, it also comes with the increasing possibility of mobile digital divide among regions, ethnicities and social classes. As the e-Government Service is only available for specific groups, the national government should proactively build an information environment to promote the convenient access and use of e-Government Service comprehensively by all the people. In the light of the sociodemographic characteristics, this study tests whether the difference is statistically significant involving the mobile digital divide between different groups with the analysis of variance, while determining the relationship between the mobile digital divide and the usage intention of e-Government Service through multiple regression analysis. The main findings of this study are as follows. First, there are differences and statistical significance between groups of different ethnicities and regions on accessibility with electronic products and networks. Second, there are obvious differences and statistical significance between groups of different ages, educational levels and ethnicities on the competency and usability of electronic products and networks. Third, the accessibility to electronic products and networks has no effect on the usage intention of e-Government Service, while the competency and usability of electronic products and networks have a strong positive impact on the usage intention of e-Government Service. The author hopes that the research findings of this paper can provide reference suggestions and opinions for bridging the digital divide among regions in China and promoting the popularization of the e-Government Service.

• 한국정보통신학회논문지
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• 제25권5호
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• pp.677-684
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• 2021

본 논문은 절대 시간 측정 가능한 시간 디지털 변환기에 대한 논문으로 제안하는 시간 디지털 변환기는 0.18-um CMOS 공정을 이용하여 설계 되었고 IC로 제작하여 검증하였다. 설계된 시간 디지털 변환기는 라이다 시스템에 적용하기 위하여 긴 측정시간과 절대적인 50ps를 측정할 수 있어야하는데 위상고정루프의 625MHz 클록을 기준클록으로 사용하기 때문에 절대시간의 측정이 가능하며 디지털 보정회로를 이용하여 어떤 상황에서 든 50ps의 분해능을 가질 수 있다. 기준클록을 카운터하여 큰 시간 단위의 측정을 할 수 있어 최대 800ns의 시간이 측정가능하고 딜레이 체인을 이용하여 정밀한 시간 값을 측정 할 수 있다. 결과적으로 제작된 시간 디지털 변환기는 50ps 단위로 시간을 측정할 수 있는데 최대 오차는 INL 0.8-LSB정도이며 1.8V 인가전압에 전력 소모는 약 70mW 정도이다.

• 기술혁신연구
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• 제31권2호
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• pp.237-262
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• 2023

디지털 트랜스포메이션은 기업의 경영 전략적 관점에서의 조직, 프로세스, 비즈니스 모델, 커뮤니케이션의 광범위하고 근본적 변화를 요구하고 있으나, 성공적인 트랜스포메이션의 핵심 선제요건 중 하나는 구성원의 IT(Information Technology) 역량이다. 공학적 배경 지식 없이 기술경영을 전공하는 학생들은 비교적 단기간에 경영관리 능력과 IT 역량을 동시에 키워야 하는 난제에 처해 있다. 이러한 이유로 효과적인 IT 역량 교육 방법은 기술경영학 분야의 교육 이슈 중 하나로 부각되고 있다. 본 논문은 디지털 트랜스포메이션의 흐름을 주도할 수 있는 학생들을 양성하기 위한 IT 역량 교육은 "무엇"을 "어떻게" 가르쳐야 할 것인가라는 질문에 대한 답을 찾기 위한 하나의 사례로서, 서강대학교 기술경영 전문대학원의 IT 관련 커리큘럼 리노베이션의 과정과 현재까지 교육과정 실행 결과를 제시한다. 특히, IT 역량 교육의 출발점이자 진입장벽이 되는 기초 프로그래밍 교육 과정의 피드백 결과에 대한 충분한 논의를 통해, 기술경영대학원 학생들을 위한 효율적인 IT 교육의 운영 방향에 대한 선행 참조사례를 제공하는 데 본 논문의 목적이 있다.

• The Journal of Advanced Prosthodontics
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• 제15권4호
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• pp.179-188
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• 2023

PURPOSE. This in vitro study aimed to evaluate the performance of digital intraoral scanners in a completely edentulous patient with angled and parallel implants. MATERIALS AND METHODS. A total of 6 implants were placed at angulations of 0°, 5°, 0°, 0°, 15°, and 0° in regions #36, #34, #32, #42, #44, and #46, respectively, in a completely edentulous mandibular polyurethane model. Then, the study model created by connecting a scan body on the implants was scanned using a model scanner, and a 3D reference model was obtained. Three different intraoral scanners were used for digital impressions (PS group, TR group, and CS group, n = 10 in each group). The distances and angles between the scan bodies in these measurement groups were measured. RESULTS. While the Primescan (PS) impression group had the highest accuracy with 38 ㎛, the values of 104 ㎛ and 171 ㎛ were obtained with Trios 4 IOSs (TR) and Carestream 3600 (CS), respectively (P = .001). The CS scanner constituted the impression group with the highest deviation in terms of accuracy. In terms of dimensional differences in the angle parameter, a statistically significant difference was revealed among the mean deviation angle values according to the scanners (P < .001). While the lowest angular deviation was obtained with the PS impression group with 0.185°, the values of 0.499° and 1.250° were obtained with TR and CS, respectively. No statistically significant difference was detected among the impression groups in terms of precision values (P > .05). CONCLUSION. A statistically significant difference was found among the three digital impression groups upon comparing the impression accuracy. Implant angulation affected the impression accuracy of the digital impression groups. The most accurate impressions in terms of both distance and angle deviation were obtained with the PS impression group.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.106-123
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• 2024

This article takes the talk show "Beast Town" as an example to introduce the overall technical solution, technical difficulties and countermeasures for the combination of cartoon virtual characters and virtual studio technology, providing reference and experience for the multi-scenario application of digital humans. Compared with the live broadcast that combines reality and reality, we have further upgraded our virtual production technology and digital human-driven technology, adopted industry-leading real-time virtual production technology and monocular camera driving technology, and launched a virtual cartoon character talk show - "Beast Town" to achieve real Perfectly combined with virtuality, it further enhances program immersion and audio-visual experience, and expands infinite boundaries for virtual manufacturing. In the talk show, motion capture shooting technology is used for final picture synthesis. The virtual scene needs to present dynamic effects, and at the same time realize the driving of the digital human and the movement with the push, pull and pan of the overall picture. This puts forward very high requirements for multi-party data synchronization, real-time driving of digital people, and synthetic picture rendering. We focus on issues such as virtual and real data docking and monocular camera motion capture effects. We combine camera outward tracking, multi-scene picture perspective, multi-machine rendering and other solutions to effectively solve picture linkage and rendering quality problems in a deeply immersive space environment. , presenting users with visual effects of linkage between digital people and live guests.

• 전기학회논문지
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• 제61권2호
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• pp.298-302
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• 2012

The linear encoder used in the BLAC driving circuit consists usually analog type sensor, and need signal transform from analog sinusoidal to digital one for application in the PWM algorithm that is used to control motor current. When the motor is driven in low speed, it is required many operations and higher quality DSP to convert the hole sensor signal to digital one with enough resolution. In this paper, the another method to convert that signal with enough resolution without calculation of sine function is proposed. This is very simple and have high resolution even if the motor is driving in low speed. To verify the proposed method, BLAC motor is used, and it is proved that the motor is tracking well the reference step signal in the low speed as well as in the high one.

• ETRI Journal
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• 제27권3호
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• pp.330-333
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• 2005

The Inter-Channel Level Difference (ICLD) is a cue parameter to estimate spectral information in a binaural cue coding that has been recently in the spotlight as a multichannel audio signal compression technique. Even though the ICLD is an essential parameter, it is generally distorted by quantization. In this paper, a new modified ICLE representation method to minimize the quantization distortion is proposed by adopting a flexible determination of the reference channel and the unidirectional quantization. Our experimental result confirms that the proposed method improves the multichannel audio output quality even with the reduced bit-rate.

• 제어로봇시스템학회논문지
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• 제2권2호
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• pp.115-120
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• 1996

In this paper, a sliding mode controller which is characterized by high accuracy, fast response and robustness is applied to speed control of AC-SERVO motor. The control input is changed to the continuous one in the boundary layer to reduce the chattering phenomenon, and the boundary layer converges to zero when the state variables of system reach to steady state values. The integral compensator is added to reduce steady state error and to provide the continuous torque reference. The acceleration which is necessary for the sliding plane is estimated by an obsever. Sliding surface is included in control input to enhance the robustness and transient response without increasing sliding mode controller gain. The proposed controller is implemented by DSP(digital signal processor). The effectiveness of the proposed scheme is demonstrated through experimental works.