• 디지털산업정보학회논문지
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• 제19권3호
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• pp.61-75
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• 2023

In this paper, we design and experiment a 5G-based metaverse motion synchronization system with configuration of a mobile motion capture studio that has not been commercialized at home and abroad. As a result of the experiment, the average value of the latency test measurement using Wi-Fi is 0.134 seconds faster than the average latency test measurement value using the 5G network. Existing motion capture studios have spatial limitations as the motion capture range is limited to the Wi-Fi communication range. However, the 5G-based metaverse motion synchronization system configures a mobile motion capture studio so that motion performers can solve the spatial limitations by expanding the motion capture communication range indefinitely regardless of time and place. Therefore, it is possible to implement realistic metaverse contents by displaying a realistic and natural digital human because it is free from spatial constraints. The system which was tested in this paper can create a new business model by converging next-generation technologies that are receiving attention related to the digital virtual world, such as motion capture + 5G + digital human twin + metaverse. And it allows for research and develop a next-generation metaverse-based broadcasting solution at a recent time when the business value of digital human and metaverse technologies and functions has been proven and related sales are growing in earnest.

• 한국게임학회 논문지
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• 제16권6호
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• pp.173-184
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• 2016

본 연구는 전통적인 양면시장인 게임산업에서 게임개발사들이 선택하는 플랫폼 전략을 모바일 게임플랫폼을 대상으로 탐색하였다. 온라인과 오프라인에 존재하는 관련 콘텐츠를 대상으로 자료를 수집하여 주제를 추출하는 콘텐츠 질적 분석을 실시하였으며 연구의 신뢰도와 타당도를 높이기 위하여 게임개발사의 임원 4명과 추가로 심층면접을 실시하였다. 연구결과는 첫째, 게임개발사의 플랫폼 선택 요인은 게임 구현능력과 기술적 안정성, 플랫폼의 마케팅능력, 그리고 수익성 창출이다. 둘째, 가치창출과 가치확보에 따라서 모바일 게임플랫폼은 SNS중심의 모바일 1세대 게임에서 마켓플레이스를 중심으로 하는 모바일 2세대 게임으로 플랫폼 주도권을 넘겨주었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.583-585
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• 2004

In this paper we will deal with a calibration method for low cost motion capture system using psd(position sensitive detection) optical sensor. To measure the incident direction of the light from LED emitted marker, the PSD is used the output current ratio on the electrode of PSD is proportional with the incident position of the light focused by lens. In order to defect the direction of the light, the current output is converted into digital voltage value by opamp circuits peak detector and AD converter with the digital value the incident position is measured. Unfortunately, due to the non-linearly problem of the circuit poor position accuracy is shown. To overcome such problems, we compensated the non-linearly by using least-square fitting method. After compensated the non-linearly in the circuit, the system showed more enhanced position accuracy.

• 한국입자에어로졸학회지
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• 제11권2호
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• pp.37-46
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• 2015

Dust particles, which inflow to the subway mechanical ventilation and air conditioning(MVAC) chamber, contain a fair amount of iron compounds, approximately 25.2w/w%. This work attempted to capture those iron containing dust using magnetic filters. Average magnetization value of the test MVAC dust was 0.012 emu on 5,000 Oe, which could correspond sufficiently with the magnetic interaction. External permanent magnets provided with magnetization of iron mesh screen showing high gradient magnetic field(HGM). It resulted in the capture efficiency with 84.0 ~ 99.7% and 81.2 ~ 99.8% for $PM_{10}$ and $PM_{2.5}$ respectively. Magnetic capture was found to be closely associated with the magnetic intensity, mesh opening size and flow velocity.

• KEPCO Journal on Electric Power and Energy
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• 제4권1호
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• pp.33-38
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• 2018

This study applied upgrades to the processes of a 10 MW wet amine $CO_2$ capture pilot plant and conducted performance evaluation. The 10 MW $CO_2$ Capture Pilot Plant is a facility that applies 1/50 of the combustion flue gas produced from a 500 MW coal-fired power plant, and is capable of capturing up to 200 tons of $CO_2$. This study aimed to quantitatively measure efficiency improvements of post-combustion $CO_2$ capture facilities resulting from process upgrades to propose reliable data for the first time in Korea. The key components of the process upgrades involve absorber intercooling, lean/rich amine exchanger efficiency improvements, reboiler steam TVR (Thermal Vapor Recompression), and lean amine MVR (Mechanical Vapor Recompression). The components were sequentially applied to test the energy reduction effect of each component. In addition, the performance evaluation was conducted with the absorber $CO_2$ removal efficiency maintained at the performance evaluation standard value proposed by the IEA-GHG ($CO_2$ removal rate: 90%). The absorbent used in the study was the highly efficient KoSol-5 that was developed by KEPCO (Korea Electric Power Corporation). From the performance evaluation results, it was found that the steam consumption (regeneration energy) for the regeneration of the absorbent decreased by $0.38GJ/tonCO_2$ after applying the process upgrades: from $2.93GJ/ton\;CO_2$ to $2.55GJ/tonCO_2$. This study confirmed the excellent performance of the post-combustion wet $CO_2$ capture process developed by KEPCO Research Institute (KEPRI) within KEPCO, and the process upgrades validated in this study are expected to substantially reduce $CO_2$ capture costs when applied in demonstration $CO_2$ capture plants.

• Communications for Statistical Applications and Methods
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• 제6권3호
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• pp.729-748
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• 1999

In this paper we present combined estimator of capture-recapture and line transect model using bivariate detection function and detection probability according to objects being in cluster population. Here bivariate detection function use distance and cluster size. The simulation shows that combined estimator approaches the more true value the larger size parameter. Therefore this estimator using the bivariate detection function is more efficient in estimate the population size and density by size parameter.

• Asian Pacific Journal of Cancer Prevention
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• 제15권11호
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• pp.4465-4466
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• 2014

HPV type-specific detection may promote cervical screening program and vaccination development worldwide. We conduct a study comparing HPV Hybrid capture II (HC II) Test and Hybribio GenoArray test, a newly developed HPV type-specific assay, in patients with cervical epithelial neoplasm. Results showed a good concordance in cervical HPV detection between two tests (kappa value 0.80, p<0.05, McNemar test). Our study may promote utilization of type-specific HPV detection that is helpful for cervical cancer screening and vaccination.

• 벤처창업연구
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• 제18권6호
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• pp.159-172
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• 2023

본 연구는 B2B(business-to-business) 비즈니스모델혁신(business model innovation, BMI)이 B2C(business-to-consumer) 비즈니스모델혁신 대비 혁신성과에 미치는 상대적 효과를 실증적으로 검증하고자 한다. 연구는 비즈니스모델혁신의 세 가지 핵심 구성 요소인 1. 가치창출(value creation), 2. 가치제안(value proposition), 3. 가치획득(value capture)을 기반으로 각각의 요소가 혁신성과에 미치는 영향을 살펴본다. 본 연구는 실증분석을 위해 (재)한국청년기업가정신재단의 2022년 기업가정신 실태조사(기업편) 데이터베이스의 2,879개 기업을 활용하였다.'산업,''기업,''CEO,''기술'등의 다양한 범주에 따른 한국의 최신 창업 현황을 탐색적으로 분석하였다. 다중회귀분석을 통해'가치창출'이 B2B (vs. B2C) 기업의 혁신성과에 더 긍정적이고 유의한 영향을 미치는 것으로 나타났다. 반면, '가치제안'은 B2C (vs. B2B) 기업의 혁신성과에 더 긍정적이고 유의한 영향을 미치는 것으로 나타났다. 흥미롭게도, 가치획득'은 양쪽 기업 모두에서 유의미한 효과를 보이지 않았다. 추가로, 본 연구에서는 강건성 검정을 위해 SUR(seemingly unrelated regression) 분석을 활용하여 결과의 신뢰성을 강화했다. 이러한 연구 결과는 B2B-BMI(vs. B2C-BMI)의 상대적 효과에 대해 중요한 인사이트를 제공함으로써, 추후 중소기업 및 스타트업의 비즈니스모델혁신 및 전략 수립에 기여할 것으로 기대된다.

• KEPCO Journal on Electric Power and Energy
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• 제2권1호
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• pp.109-113
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• 2016

Techno-economic evaluation of Non-Capture $CO_2$ Utilization (NCCU) technology for the production of high-value-added products using greenhouse gas ($CO_2$) was performed. The general scheme of NCCU process is composed of $CO_2$ carbonation and brine electrolysis process. Through a carbonation reaction with sodium hydroxide that is generated from brine electrolysis and $CO_2$ of the flue gas, it is possible to get high-value-added products such as sodium bicarbonate, sodium hydroxide, hydrogen & chloride and also to reduce the $CO_2$ emission simultaneously. For the techno-economic study on NCCU technology, continuous operation of bench-scale facility which could treat $2kgCO_2/day$ was performed. and based on the key performance data evaluated, the economic evaluation analysis targeted on the commercial chemical plant, which could treat 6 tons $CO_2$ per day, was performed using the net present value (NPV) metrics. The results showed that the net profit obtained during the whole plant operation was about 7,890 mKRW (million Korean Won) on NPV metrics and annual $CO_2$ reduction was estimated as about $2,000tCO_2$. Also it was found that the energy consumption of brine electrolysis is one of the key factors which affect the plant operation cost (ex. electricity consumption) and the net profit of the plant. Based on these results, it could be deduced that NCCU technology of this study could be one of the cost-effective $CO_2$ utilization technology options.

• 대한교통학회:학술대회논문집
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• 대한교통학회 2003년도 제43회 학술발표회논문집
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• pp.127-150
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• 2003

This research presents a novel application of static traffic assignment methods, but with a variable time value, for estimating the market share of a high-speed rail (HSR) in the NW-SE corridor of Korea which is currently served by the airline (AR), conventional rail (CR), and highway (HWY) modes. The proposed model employs the time-space network structure to capture the interrelations among all competing transportation modes, and to reflect their supply- and demand-sides constraints as well as interactions through properly formulated link-node structures. The embedded cost function for each network link offers the flexibility for incorporating all associated factors, such as travel time and fare, in the model computation, and enables the use of a distribution rather than a constant to represent the time-value variation among all transportation mode users. To realistically capture the tripmakers' value-of-time (VOT) along the target area, a novel method for VOT calibration has been developed with aggregate demand information and key system performance data from the target area. Under the assumption that intercity tripmakers often have nearly "perfect" travel information, one can solve the market share of each mode after operations of HSR for each O-D pair under the time-dependent demand with state-of-the-art traffic assignment. Aside from estimating new market share, this paper also investigated the impacts of HSR on other existing transportation modes.