• Journal of radiological science and technology
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• v.32 no.1
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• pp.1-15
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• 2009

Newly published IEC 60601-1-3 ; 2008 2nd Edition has two important meanings. First, Radiation Quality and Dose should make sure for safety of patient and staff in manufacturing diagnostic X-ray equipment. Second, it should be minimized of Leakage Radiation, Residual Radiation, and Stray Radiation. The requirement to make enactment or revision of national standard for diagnostic X-ray Equipment is as follows : 1. It should be adjusted the new standard to the recent IEC Publication under the consideration of the Korea medical circumstances. 2. For focus to the Radiation Safety, IEC 60601-1-3 (General requirements for radiation protection in diagnostic X-ray equipment) could be applied to the new regulation. It should be compact sentence. 3. A sudden Notification change should not be desired. It needs a enough time to make easy the circumstances.

• Journal of Satellite, Information and Communications
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• v.11 no.3
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• pp.37-42
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• 2016

In this paper, in today's highly complex video and broadcast operations, broadcasters are constantly challenged to reliably deliver low-latency, high-quality video to multiscreen audiences on-air and online. The Adaptive Bit Rate (ABR) protocols enable internet video to a wide range of multiscreen devices. However, video quality is often marginal and would prove unacceptable for valued linear broadcast content delivered to the Big Screen today. The Media information processing technology advances in ABR enables service providers to take control and offer quality managed linear video services to ALL screens in the home, including the Big Screen, with a single unified IP Video infrastructure. The New Multiscreen-Assisted ABR (MSA-ABR) delivery management system proposed using Cloud based multicast-assisted ABR for a broadcast facility that performs routing of contribution content and online publishing services within a virtual, centralized cloud infrastructure.

• Journal of Ginseng Research
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• v.1 no.1
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• pp.79-88
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• 1976

A determinatien of the saponins in ginseng tea and extract was carried out by using the quantitative TLC autodetector equipped with a hydrogen flame ionization detector. In order to apply to the Quality central of the ginseng tea and extract. the optimum condition and recovery percentage for the quantitative determination of saponins in these products duo studied. The results obtained were as follows: The method was adequate to estimate whether the ginseng extract used for the Products and She raw ginseng extract were the same quality or net. Most of the individual peak area was increased with the concentration of the total saponin. But some of the peak areas were net increased quantitatively in the ease of the sample containing high concentration ginseng extract. To deternine the saponins in ginseng tea correctly high volume low concentration was better than the low volume high concentration. Optimum concentration of ginseng extract in sample to determine the individual saponins was in the range of 0.5∼1.5g. The recovery percentage of the total saponin was 99.5% on the average.

• Journal of Environmental Policy
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• v.14 no.2
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• pp.133-148
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• 2015

The number of used oil refining companies has been increased and it causes shortage of the volume of used oil per recycling company. In addition, the number of used oil collecting companies has been increased and it caused excessive competition among companies with excessive costs. Companies use not only proper used oil but also low quality used oil because of shortage of supply. It is the reason of environmental pollution. Also excessive competition brings high cost of refined oil and it becomes a burden on the consumer. Therefore, the recycling improvement plans of used oil is needed because of these causes. First of all, importing used oil from the developed countries of OECD is the one of solution to secure a used oil supply. However, imported used oil should meet the international quality standards and it is examined twice by international authority institute such as K-petro in both exporting and importing countries. Second, the cost would be reduced with the relaxation on regulations of used oil refinement. However, regulation to sediment and water should be separated. Sediment should be kept within 2% and water should be kept within 5%. It is the way to relax the regulations of used oil refinement with preventing environmental pollutions. Finally, the standard of used oil for heater should be regulated strictly. To prevent pollutions, used oil for heater is limited to high quality waste lubricating oil. Also the air pollution prevention device has to be installed on heater.

• Journal of the Korea institute for structural maintenance and inspection
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• v.16 no.5
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• pp.129-136
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• 2012

Temperature of fresh concrete can be effectively used to predict the strength of concrete being cured and make an informed decision for stripping the molds. A hygrothermograph and thermo-couple sensors that require an extensive wiring have been applied to measure a temperature of concrete at the early stage of the curing process on site. However, these methods have limits to provide the temperature data in real time due to harsh working environment including frequent cutting of wires. Therefore, this study is aiming at developing a device based on wireless sensor network to measure the temperature of concrete being cured in formwork. The result showed that the wireless sensor with probe type thermistor which is developed had the same temperature data compared to the existed wire type thermistor, and we confirmed the temperature history of concrete in real time for 28 days throughout the gateway by wireless network that collects the temperature data measured from specimens in laboratory. Also, the network device for transmission can be easily separated from the probe sensor part and reused consistently. If the wireless sensor network device developed uses in the field, the temperature management of concrete will be systematically conducted from at the early stage of the curing, and especially be effective for cold weather concrete construction. In addition, it will contribute to the establishment of advanced quality control system for concrete and productivity of supervisors on site will be increased in the future.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.35D no.11
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• pp.10-22
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• 1998

In this paper, as a way of improving the availability and spectral efficiency of radio relay system, a co-channel radio relay system based upon the synchronous digital hierarchy is developed and its performance measured by 64-QAM with a never-seen multi-purpose ASIC chip is illustrated. This system provides a couple of transmission capacity compared with alternative channel arrangement. By adopting a powerful complex 13-tap adaptive time domain equalizer and cross-pol interference canceller, improvement of more than 1.5 ~ 2.0 dB in signature is obtained in comparison to 9 or 11-tap adaptive time domain equalizer, and about 22.5 dB in improvement factor of cross-pol interference canceller is achieved at C/N of 24.5 dB. In addition, digital filter makes it possible to optimize the occupied bandwidth by selecting an appropriate roll-off factor externally. It is expected that co-channel radio relay system with the powerful multi-purpose ASIC chip plays a key role in creating a value-added product, reliability, and reducing the outage time.

• Korean Chemical Engineering Research
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• v.60 no.4
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• pp.557-563
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• 2022

In order to measure the allergen penetration of micropore fabrics, it is necessary to develop a convenient and appropriate experimental method for measuring a pore size of micropore fabrics. In this study, a simple and economical experimental apparatus was developed for the analysis of the pore size of micropore fabrics by measuring the weight reduction rate. In addition, the allergen blocking properties was evaluated by measuring the pore sizes of various fabrics. According to this study, the size of the pores of the microporous fabric could be obtained by measuring the weight reduction rates. In addition, higher weight reduction rate was obtained as the suction pressure passing through the particle permeation device decreased and the suction time was increased. It is expected that the developed experimental method and apparatus can be utilized as an experimental standard for quality control methods to verify the effectiveness of micropore fabrics used for house dust mite blocking bedding.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.54-57
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• 1998

As the physical layer on telecommunication network is replaced fiber optic lines, it is increased the need of systematic maintenance for fiber optic lines. Korea Telecom has developed FLOMS in order to establish maintenance processes for optical fiber lines. FLOMS has functions which manages optical facilities and tests optical fiber lines automatically. As a resuls, this system can check and/or report a fault. Operator, who is reponsible for management of optical fiber lines, can test the characteristics of optical fiber lines remotely using FLOMS. As interpoerable with Digital Transmission Management System, FLOMS provides efficient management for optical fiber lines. This system improves the work process to find fault location fast, detect the degradation of fiber quality, and make database of optical facilities efficiently.

• 한국경호경비학회:학술대회논문집
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• 2008.11a
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• pp.63-82
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• 2008

지난 10여 년 동안 대만사회의 가장 큰 변화 중 하나는 '개인 경비', 혹은 '개인 경호' 사업이 크게 발달했다는 것이다. 민간의 역량과 과학화된 설비로써 재산보호와 신변보호를 하고자 하는 개인 경비에는 여러 방식이 있다. 예를 들어 개인안전 경비(즉, 수행경호), 현금운송 경비, 주거경비, 상공업경비(여기에는 공장지대의 안전한 보호와 백화점, 금융기관, 보석상점 및 편의점 등의 경비가 포함됨), 그리고 각종 경비장치의 설치 등이 있다. 천징훼이(陳靜慧, 2006)는 대만의 경비 산업 경영형태에 대해 아래와 같이 분석하였다. 그의 주장에 따르면, 대만의 경비 산업은 일반 업무 위주로 하고 있으며, 여기에는 시스템 경비, 상근 경비, 현금 경비, 신변 경비가 있다고 밝혔다. 이 일반 업무는 일본, 미국, 독일의 형태와 유사하다. 그러나 미국과 독일의 경비회사들은 특수한 업무를 담당하고 있다. 미국의 경우 무장경비 현금수송, 신용조사 업무, 보험조사 업무, 거짓말 탐지 업무를 수행한다. 독일의 특수 업무에는 군대설비 경비, 교통지휘 및 질서 유지, 신속 고발 경비, 그리고 교도소 경비가 있다. 량신쩐(梁心禎, 2006)은 대만의 경비 산업 발전의 흐름에 대해 다음 세 단계로 구분했다. 제1단계는 1978년부터 1987년까지로 이 시기 대만은 일본 경비 사업 발전의 영향을 수용했기 때문에 일본의 경비사업 관리방식과 시스템 설비를 받아들여 점차 대만 방식의 경비 형태로 발전시켜 나갔다. 초기 발전단계의 경영방식은 주로 외국 기술과의 협력을 통한 시스템 경비가 주를 이루었다. 제2단계는 1988년부터 1997년까지인데, 이 시기에 이르러 경비 사업은 비인기 사업에서 인기 사업으로 시장이 확대되었고, 해외업체와의 활발한 기술 교류, 새로운 브랜드 개발과 경비 경영 방식의 혁신, 그리고 상근 경비와 수행경호와 같은 경비 관련 항목의 확장을 이루었다. 또한 이 시기에 수많은 경비회사들이 세워져 새로운 경쟁시대로 돌입하였다. 제3단계는 1998년부터 현재까지로 이전의 전통적인 건물경비 방식에서 경비와 부동산 관리 서비스를 함께하는 방식으로 경영 형태가 바뀌었고 전반적인 서비스 품질을 중시하기 시작하였다. 따라서 경비 사업자는 아파트 및 빌딩관리 보호 회사를 설립하여 이를 공동 경영하였으며, 전문적이고 종합적인 단계로 들어섰다. 대만 경비 교육제도의 설립과 제도화된 면허증 시스템 구축은 아직 초보적인 단계로써 여전히 이 두 방면의 발전을 강화시켜야 하는데, 교육과 심사를 시행하여 경비원의 소질을 향상시켜야 할 것이다. 경비사업자는 과학기술적인 통제 시스템을 받아들여 인건비를 낮추고 서비스의 범위와 품질을 향상시켜야 한다. 또한 각 지방의 노동조합은 정부가 법령을 개정하여 경비원의 자격제한과 업무를 보장해주도록 건의해야만 경호원의 대우와 이미지가 개선될 수 있다. 아울러 국제학술교류의 확대와 경비 관련 산업에 대한 토론회와 전시회를 자주 개최하여 새로운 지식을 습득해야 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.8
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• pp.535-544
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• 2018

As the spread of mobile devices equipped with various sensors and high-quality wireless network communications functionsexpands, the amount of spatio-temporal data generated from mobile devices in various service fields is rapidly increasing. In conventional research into processing a large amount of real-time spatio-temporal streams, it is very difficult to apply a Hadoop-based spatial big data system, designed to be a batch processing platform, to a real-time service for spatio-temporal data streams. This paper extends the MapReduce online framework to support real-time query processing for continuous-input, spatio-temporal data streams, and proposes a load management method to distribute overloads for efficient query processing. The proposed scheme shows a dynamic load balancing method for the nodes based on the inflow rate and the load factor of the input data based on the space partition. Experiments show that it is possible to support efficient query processing by distributing the spatial data stream in the corresponding area to the shared resources when load management in a specific area is required.