• 디지털융복합연구
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• 제11권3호
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• pp.371-380
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• 2013

본 연구는 남자 비만 중학생을 대상으로 최대하 방법의 PACER 검사를 통해 최대산소섭취량($\dot{V}O_{2max}$)을 추정할 수 있는 추정식을 개발하고자 중학교 남자 비만 학생 57명을 대상으로 Bruce 프로토콜의 최대운동부하검사와 PACER 검사를 실시하였다. 최대하 수준을 결정하기 위해 PACER 운동 중 목표심박수(75%$HR_{max}$ 이상)가 나타나는 왕복횟수 구간별 대사반응을 측정하였으며, $%HR_{max}$ 구간별(75%, 80%, 85%, 90%, 95%) 대사반응 지표를 단계적 선택법으로 회귀분석을 실시하였다. 그 결과 다음의 모형이 산출되었다. 모형 1(90%$HR_{max}$의 모형): $\dot{V}O_{2max}$(ml/kg/min) = 142.721-0.275(왕복횟수)-0.48(심박수)+0.177(체중)-1.536(연령)[표준오차 3.90ml/kg/min; 2단계까지 운동진행]. 모형 2(95%$HR_{max}$의 모형): $\dot{V}O_{2max}$(ml/kg/min) = 182.851-0.103(왕복횟수)-0.744(심박수)+0.186(체중)-0.324(연령)[표준오차 4.51ml/kg/min; 3단계까지 운동진행]. 모형 1의 추정된 $\dot{V}O_{2max}$와 실측 $\dot{V}O_{2max}$간 차이 평균은 $3.25{\pm}6.32ml/kg/min$(%error=6.84%), 모형 2는 $3.16{\pm}4.54ml/kg/min$(%error=5.75%). 비만인 대상자들에게 최대하 운동방법으로는 심박수와 운동지속시간이 짧았던 모형 1이 모형 2보다 적합한 형태로 생각된다.

• Nuclear Engineering and Technology
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• 제55권11호
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• pp.4287-4294
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• 2023

In order to meet the energy demand, energy production must be done continuously. Hydrogen seems to be the best alternative for this energy production, because it is both an environmentally friendly and renewable energy source. In this study, the hydrogen fuel production of the peaceful nuclear explosives (PACER) fusion blanket as the energy source integrated with Fe-Cl thermochemical water splitting cycle have been investigated. Firstly, neutronic analyzes of the PACER fusion blanket were performed. Necessary neutronic studies were performed in the Monte Carlo calculation method. Molten salt fuel has been considered mole-fractions of heavy metal salt (ThF₄, UF₄ and ThF₄+UF₄) by 2, 6 and 12 mol. % with Flibe as the main constituent. Secondly, potential of the hydrogen fuel production as a result of the neutronic evaluations of the PACER fusion blanket integrated with Fe-Cl thermochemical cycle have been performed. In these calculations, tritium breeding (TBR), energy multiplication factor (M), thermal power ratio (1 - 𝜓), total thermal power (P_hpf) and mass flow rate of hydrogen (ṁ_H2) have been computed. As a results, the amount of the hydrogen production (ṁ_H2) have been obtained in the range of 232.24x10⁶ kg/year and 345.79 x10⁶ kg/year for the all mole-fractions of heavy metal salts using in the blanket.

• 한국임상수의학회지
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• 제33권6호
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• pp.400-401
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• 2016

The object of this study was to evaluate the possibility and incidence of innate pacer in Jeju raceresource. This peculiar gait occurs naturally in some foreign breeds. To author's knowledge, this is the first report of innate pacers on the Korean native horse. In order to determine the incidence of pacer in Jeju Ponies and Jeju Pony crossbreds, gait analysis and pedigree check were performed at the Let's Run Park Jeju (total 547 ponies and pony crossbred racers) in 2013. Results of this study showed that 16 (8.1%) of the 198 examined Jeju Ponies. However, 349 Jeju Pony crossbreds had no innate pacers. Of the 16 Jeju Pony pacers, 11 males (68.8%) and 5 females (31.2%) are included in the present study. In conclusion, only the Jeju Pony was innate pacers like other foreign breeds. The authors suspect that the causes of the difference of the breeds were origin of the pony and genetic differences.

• 한국항공운항학회지
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• 제31권3호
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• pp.79-92
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• 2023

Aluminum alloys are important materials in modern aircraft. Aircraft failures due to corrosion are fatal and costly. Thus, information about the atmospheric corrosion of aluminum is helpful for aviation safety. This study employed four corrosion models and 12 environmental variables to improve knowledge of aluminum atmospheric corrosivity: PACER LIME, ICP, ISO CORRAG, and a modified model of CORRAG. This study applied each model on 47 aircraft operating bases in Korea and compared the results. In the results, The risk of corrosion was different for each model. The cause was the difference in environmental variables according to the model. Especially, the effect of ozone, which has recently been increasing, was shown in the results of PACER LIME. These findings suggest that caution is needed when assessing atmospheric corrosion risk as a single model. Furthermore, it means that the application and integration of various models are needed to improve atmospheric corrosion risk assessment.

• 전자공학회논문지SC
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• 제47권3호
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• pp.40-47
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• 2010

본 연구는 심초음파에서 사용되는 실시간 심전도 QRS 검출성능 및 심전도 trigger 시간 지연 등의 생체신호측정모듈의 성능 개선을 확인하고자 하였다. 심초음파에서 사용되는 생체신호측정모듈의 심전도 QRS 검출에 대한 성능 평가 중에서 심전도 QRS 크기와 폭에 따른 검출성능, Tall T-wave 제거성능, 부정맥이 있는 심전도의 QRS 검출성능 및 Pacer pulse 검출성능은 심전도 국제 규격인 EC-13을 기준으로 성능을 비교 평가하였으며, QRS의 trigger 신호 지연 시간 및 기저선 복귀시간은 기존에 상용화되어 심초음파에 사용되고 있는 생체신호측정모듈의 성능과 비교 평가하였다. 본 연구에서는 위 4가지 항목은 국제규격인 EC-13 기준을 크게 만족하였으며, QRS의 trigger 신호 지연 시간은 심박수에 따라 17m~21ms 빠른 검출 결과를 보였으며 심전도 기저선 복귀시간도 1 beat 이상 빠른 결과를 보였다.

• 정보처리학회논문지C
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• 제10C권7호
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• pp.923-928
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• 2003

본 논문은 그리드 네트워크의 패킷 지연시간단축을 위한 병목 링크 대역폭 측정 알고리즘을 제안하고자 한다. 병목 링크 대역폭 측정방법으로 packet pair 알고리즘과 Paced Probes가 있으나 이들은 pacer 패킷으로 cross traffic의 영향을 줄이면서 Paced probe 패킷들이 링크를 지날 때 발생하는 시간 차이를 이용하여 병목 링크 대역폭을 구한다. 그러나 경로상의 병목 링크 대역폭을 측정할 뿐이지 병목현상이 발생한 지점은 알 수 없는 문제점이 있다. 이를 hop-by-hop 측정에 기반한 병목 대역폭 측정을 제시하여 그리드 네트워크에서 전체적인 패킷 지연 개선을 이룰 수 있다. hop-by-hop의 병목 대역폭을 측정하기 위해 paced probe 패킷에 타임스탬프 옵션을 이용하며 병목현상 해소를 통하여 패킷 전송 지연의 단축을 시뮬레이션을 통해 알 수 있다. 본 논문에서 제시한 알고리즘으로 병목 링크의 대역폭과 위치를 파악하여 그리드 ETP나 실시간 QoS를 보장하는 데이터 전송에 기여할 것으로 기대된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 춘계학술대회 논문집
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• pp.182-186
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• 1995

In this pacer, it is examined and confirmed that the R factor which is compensated after analyzing the characteristics of superconductor resulted from this experimented theory with the computer simulation, is refined to R$\sub$WP/=8.83[%], R$\sub$P/=6.47[%], R$\sub$I/=10.08[%], RF=7.19[%], R/eub E/=3.76(%), and on the basis of these experimental data, the significant parameter such as the scale factor(s) and the zero point shift(Z) and FWHM value(U,V,W) are optimized as follows; S =72.0827E-3, Z=0.2146, U=4.2761E-2, V=1.7983E-2, and W=2.6768E-2

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 춘계학술대회 논문집
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• pp.86-89
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• 1995

In this pacer, The effect of the impedances in SNOSEFT s memory devices has been developed. The effect of source and drain impedances are measuring using the method of the field effect bias resistance in the inner resistance regions of the device structure and external bias resistance. The effect of impedance by source and drain resistance shows according to increasing to the storage of memory charges, shows according to a function of decreasing to the gate voltages, shows the delay of threshold voltages, The delay time of low conductance state and high conductance state by the impedance effect shows 3 [${\mu}$sec] and 1[${\mu}$sec] respectively.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.341-342
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• 2006

A physical model for reduction of Electromagnetic Interference(EMI) or its predecessors, Radio Noise, Electrical Noise, or Radio-Frequency-Interference(RFI), is a rapidly expanding digital technology. It covers the frequency spectrum from DC to about 3 GHz EMI is the poisoner which does not allow radio, TV, radar, navigation, and a lot of electrical, electro-mechanical, and electronic and communication devices, apparatus and systems to operate compatibly in a common frequency spectrum environment EMI can result in a jammed radio, heart pacer failures, navigation errors and many other either nuisance or catastrophic events. Therefore, it follows that this spectrum pollution problem has reached international levels of concern and must be dealt with m proportion to the safety and economic impact Involved.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제51권4호
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• pp.187-194
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• 2002

Recently, the application of the linear machine far industrial field is remarkable increased, especially for the gantry machine, machine tool system and CNC. In these application fields, high dynamics position control performance Is essentially required in both the steady and the transient state. This pacer presents simple but powerful position control loop based on traditional PID controller. The presented position control algorithm, named 'Unified PID Position Controller'has great features for the linear machine drives such as no over-shoot phenomena and simple gain tuning strategy. Through the experimental results with commercial linear motors, it is shown that the proposed algorithm has excellent dynamics suitable fur linear motions.