• 보존과학회지
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• 제37권3호
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• pp.220-231
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• 2021

문화재 방사선 비파괴 투과 조사 방식은 이미지플레이트(Image Plate, IP)를 사용하는 디지털 방사선영상시스템(Computed Radiography, CR)이 도입되면서 필름방식의 아날로그 이미지에서 점차 디지털 이미지로 교체되고 있다. 방사선 비파괴 투과 조사의 이미지 품질은 촬영 조건(관전압, 관전류, 노출시간), 영상 획득 매체, 촬영 거리, 유물의 두께 등이 영향을 미친다. 이 논문에서는 목재 문화재에 주로 사용되는 수종(소나무, 밤나무, 은행나무, 상수리나무)에 X선 선원의 투과 특성을 GE사(社)의 CR 영상 시스템을 통해 획득된 이미지의 그레이 스케일(Gray Scale)을 분석한 후 신호 대 잡음비(signal to noise ratio) 및 대조도를 평가하고, 이중-선 상질계(Duplex-wire image quality indicator), 구형파 차트(line-pair gauges), 선형 식별계(Image Quality Indicator)를 이용하여 이미지를 분석하였다.

• Journal of Preventive Medicine and Public Health
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• 제20권2호
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• pp.255-260
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• 1987

The digital dust indicator (Sibata P-5), one of the direct·reading instruments was evaluated for the respirable dust in the underground coal mine environments. As a reference, respirable dust was determined using three cyclones and/or impactors. All the tests were performed on aerosol in twenty underground coal mines. The coefficients of mass-relative concentration were $0.067{\pm}0.054$ (Mean$\pm$Standard deviation) (range: 0.006-0.172). The relationship between relative concentration and temperature was not significant statistically. Also, the relationship of relative concentration and relative humidity was not significant. Mass concentration and relative concentration were $5.31{\pm}5.22mg/m^3$ and $162{\pm}163$ CPM ($Mean{\pm}Standard$ deviation) respectively. The range of mass concentration was $1.22-22.69mg/m^3$; relative concentration 16-628 CPM. The relationship of mass concentration and relative concentration was not significant in these ranges.

• 전기전자학회논문지
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• 제26권4호
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• pp.681-685
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• 2022

COVID-19 사태를 비롯하여 인류는 지속적인 바이러스 감염에 노출되고 있고 감염자를 신속하게 격리하고 접촉자를 추적하여 감염 확산을 방지를 위한 노력이 진행되고 있다. 연락을 통해 확진자 접촉을 확인하는 수동적인 역학조사는 정확성과 신속성 측면에서 한계가 있어 다양한 디지털 기술을 활용한 자동적인 추적 방법이 제안되고 있다. 본 논문에서는 저전력 블루투스 BLE(Bluetooth Low Energy) 기술을 활용하여 접촉을 확인하고 RSSI (Received Signal Strength Indicator) 값에 대한 분석과 보정을 통해 밀접 접촉을 식별하는 알고리즘을 제시하고, 중앙집중형 서버 구조의 바이러스 확산을 방지할 수 있는 시스템을 제안하고자 한다.

• International Journal of Internet, Broadcasting and Communication
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• 제7권2호
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• pp.123-129
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• 2015

This paper proposes an efficient method to detect direction indicators on road surfaces to support drivers in driving safely using the Simulink model. In the proposed method, the ROIs are detected using the detection method of maximally stable extremal regions (MSER), and the road indicator regions are detected using the speeded up robust features (SURF) matching method for the corresponding point matching of the detected ROIs and the road indicator templates. Experiments on various road satiations show that the processing time of about 0.32 sec per frame was required, and a detection rate of 91% was achieved.

• 한국멀티미디어학회논문지
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• 제14권6호
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• pp.794-801
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• 2011

공장의 주요 설비들은 설비의 운전정보를 관리자에게 보여주기 위한 다양한 디지털 지시계를 가지고 있는 경우가 많은데, 생산성을 향상시키기 위한 공장 자동화를 위해서 다양한 설비들의 운전 정보를 원격지에서 제어할 필요가 있다. 원격지 통신을 위해서 이더넷(Ethernet) 인프라를 이용하면 편리하지만, 국내 공장에서 보유한 생산설비의 경우 아직도 많은 설비들이 RS232C나 RS485통신 방식만을 지원하는 경우가 많다. 이러한 경우에 RS232C나 RS485틀 사용해서 통신하는 설비의 운전정보를 Ethernet으로 변환해주는 것이 필요하다. 본 논문에서는 무선 인터넷 기반에서 원격지에 있는 설비를 제어하기 위해서 자바와 시리얼통신용 RxTx 패키지를 이용한 통신 프로그램 구현 방법을 보인다. 시스템의 구현을 위해 현재 운전되고 있는 설비의 상태를 파악하기 위해 RS485 통신이 가능한 산업용 디지털 지시계와 열전대를 사용하여 온도 정보를 전송하도록 하드웨어를 구성하였고, RS485로 입력된 정보를 RS232c로 변환하는 변환기를 거친 후, 무선 Ethernet으로 변환해주는 변환기를 설치한 후, 서버와 통신하도록 구현하였다.

• 동력기계공학회지
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• 제12권6호
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• pp.18-23
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• 2008

This paper describes development of real-time condition monitoring system to observe state of a container crane in a port. To analyze the state of a crane, the strength and the direction of wind are measured with sensors along with the load resulted a crane at the moment. The measured signals are processed by especially developed conditioning board and converted into digital data. Measured data are analyzed to define the state of the crane at an indicator. For transmission of these data to the indicator, we implemented wireless sensor network based on IEEE 802.15.4 MAC(Media Access Control) protocol and Bluetooth network protocol. To extend the networking distance between the indicator and sensor nodes, the shortest path routing algorithm was applied for WSN(Wireless Sensor Network) networks. The indicator sends the state information of the crane to monitoring server through IEEE 802.11 b wireless LAN(Local Area Network). Monitoring server decides whether alarm should be issued or not. The performance of developed WSN and Bluetooth network were evaluated and analyzed in terms of communication delay and throughput.

• 유통과학연구
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• 제18권12호
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• pp.67-77
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• 2020

Purpose: Based on the author's adapted invariant choice, this study is to present the methodology and the calculation of the integral index of the digital component of the quality of life. By analyzing the digital indexes, the study is also to discuss distribution of ICT and the digital quality of life of the population of Kazakhstan and its regions. Research design, data, methodology: In this research, the method of calculation of integral assessment of the indicator was used, which indicates index constructs. The study analyzed objective secondary data for the period 2017-2019, which was the database from official websites of the Committee on Statistics of the Republic of Kazakhstan. Results: The study produced an integral code for assessing digital components of living standards of the population, consisting of five groups sub-indexes. Conclusions: Based on the provided analyses, we can confirm the existence of a significant difference of all the indicators of digital living standards of the population between the two leading cities: Almaty city and Nur-Sultan city. Furthermore we can deduce the differences of the examined indexes for other regions of Kazakhstan. Despite the rapid adoption of digital technologies, Kazakhstan still has significant digital gaps among cities indicating regional differences in the speed of implementation and distribution of digital technologies.

• 한국의류산업학회지
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• 제23권6호
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• pp.844-851
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• 2021

Due to the increase in consumers' interest about well-being, interest in eco-friendly products has been increasing due to the harmful effects of various harmful substances contained in textile products and environmental issues. As a result, natural dyes of less potential risk than synthetic dyes and digital textile printing(DTP) textile products with less environmental pollution are drawing attention. However, due to the lack of evaluation criteria for DTP textile products with natural ink and the nature of many colors are stacked layer by layer for dying, the need for simultaneous analysis is emerging. To evaluate whether the natural dye is derived from natural ingredients, the biocarbon content is analyzed. However, in the case of ink made using natural dyes and DTP textile products using natural ink, it is difficult to analyze the biocarbon content due to the limitation of the presence of a small amount of dye contained therein. In this study, we were shown the possibility of natural derived verification by cross-checking the analytes of natural dyes (Persicaria tinctoria, an indigo dye; Dactylopius coccus, a light red; and Curcum longa L., i.e., turmeric) and natural ink with HPLC-MS/MS. The coefficient of determination was 0.999 or higher, the limit of quantification was 0.647-3.664 ㎍/L and a %RSD of each indicator material was less than 10. Then, the extraction amount of natural dyes for five patterned fabrics was analyzed.

• 한국게임학회 논문지
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• 제19권5호
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• pp.63-76
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• 2019

본 연구는 게임 플레이어들이 플레이 과정에서 어떤 경험을 예술적이라고 인식하는지에 대한 실증 연구이다. 12명의 게임 플레이어가 참여하는 플레이 워크숍을 통해 플레이보고서를 수집하고, 예술적 경험의 다양한 층위에 대한 지시 범주를 체계화하였다. 이를 바탕으로 네트워크 의미망 분석을 수행하여 플레이어가 플레이 과정에서 어떤 경험을 예술적 의미로 받아들이고 있는지 구체화하였다. 그 결과 게임 플레이어들은 일반 예술과 마찬가지로 삶을 성찰하는 주제 의식을 발견하거나 게임의 의미를 해석하는 과정에서 예술적 경험을 창출하고 있음을 확인하였다.

• 한국멀티미디어학회논문지
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• 제24권12호
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• pp.1682-1692
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• 2021

Digital Twin, one of the core technologies of the Fourth Industrial Revolution, is attracting attention as a very suitable technology for disaster monitoring such as fires and earthquakes. In this paper, we implement a system equipped with UWB RTLS(Ultra-Wideband Real Time Location System), real-time remote control, and video streaming, which are element technologies for disaster monitoring digital twin. Since the proposed system structure is based on a cloud server, the actual location of the UWB indoor positioning-based client is transmitted to the user device in real time and stored on the cloud server for statistical and data analysis. In addition, we demonstrate through experiments that outliers occurs when the value of RSSI(Received Signal Strength Indicator) decreases due to communication collisions between UWB Tags, and propose an RSSI outlier correction algorithm to solve this problem.