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정길수(Jeong Gil Soo),박병수(Park Byung Soo),홍영길(Hong Young Kil),유남재(Yoo Nam Jae) 강원대학교 산업기술연구소 2004 産業技術硏究 Vol.24 No.1
This Study is results of experimental works to investigate the characteristics of vibro-compaction of crushed stones having coarse grain sizes. For testing material, crushed stone, sieved within very narrow ranges of grain size distribution, was used. Cyclic loading apparatus was used to apply cyclic loading to the specimen prepared in the mold. Tests were performed by changing the ratio of the maximum to the minimum stress, frequency and the magnitude of the maximum and the minimum stresses. Settlement of specimen due to cyclic loading was measured to analyze the compaction efficiency and sieve analysis test after cyclic loading test was also carried out to find the crushing rate of the specimen. As results of cyclic loading test, normalized settlement in terms of specimen height tends to be converged around loading cycle number of 1500. The magnitude of normalized settlement is in the range of 3.11 ~ 8.57%. The crushing rate is in the range of 4.46 ~ 8.78%. Normalize settlement and the crushing rate tend to increase with decreasing the ratio of the maximum to the minimum stresses and they tend to increase with increasing the frequency and the magnitude of the maximum and the minimum stresses for the given ratio. In conclusions, compaction rate of crushed stone is controlled by the dynamic stress (difference between the maximum and the minimum stresses) and the crushing rate is dominated by applied energy to the specimen.
항재밍/저피탐 웨이브폼이 적용된 군 초소형 위성 통신체계 소개
이주형,박해원,정길수,Ju Hyung Lee,Hae-Won Park,Kil Soo Jeong 한국우주과학회 2023 우주기술과 응용 Vol.3 No.2
The existing military satellite communication system was based on geostationary satellites equipped with special communication payloads against enemy's jamming and signal reception. With the advent of new weapon systems such as unmanned systems, the need for low-orbit satellite-based communication system is increasing. This paper introduces various waveform technologies suitable for cube satellite-based communication system and the operational concept of a future military nanosatellite communication system.
HEMP 상황 하 전술기동무선통신체계 안테나 유도전압 측정 및 분석
박경제(Kyoung-Je Park),정길수(Kil-Soo Jeong)김정섭(Jung-Sup Kim),박용우(Yong-Woo Park),박재현(Jae-Hyun Park) 한국시뮬레이션학회 2021 한국시뮬레이션학회 논문지 Vol.30 No.2
고고도 전자기 펄스(HEMP)의 상황은 고고도 핵폭발로 인해 발생한다. HEMP상황은 위협 레벨 조사(TLI)를 통해 HEMP 상황을 시뮬레이션 할 수 있다. 본 논문에서는 전술기동무선통신체계의 안테나 종류에 따른 유도 전압을 위협 레벨 조사로 측정 및 분석 하였다. HEMP의 영향을 받으면 전자 장비가 마비되거나 손상 될 수 있다. HEMP 방호 필터는 전원선 및 신호선용으로 상용화되어 있다. 그러나 안테나용 HEMP 필터는 상용화가 부족한 편이며 존재하더라도 낙뢰보호용으로 제작되어 있다. 안테나의 주파수와 종류에 따라 적절한 HEMP 방호 필터를 만들기 위해 유도 전압을 측정하고 외삽법을 통해 최대 유도 전압을 분석하였다. 측정 결과 HF, VHF, UHF 대역과 같이 주파수가 증가할수록 측정된 유도전압은 감소하는 것으로 나타났다. The situation of high-altitude electromagnetic pulses (HEMP) arises from high-altitude nuclear explosions. The HEMP situation can be simulated through the threat level investigation (TLI). In this paper, the induced voltage according to the antenna type of the tactical mobile radio communication system was measured and analyzed by TLI. Under the influence of HEMP, electronic equipment can be paralyzed or damaged. HEMP protection filters are commercially available for power lines and signal lines. However, commercialization of HEMP filters for antennas is insufficient, and even some of them exist for lightning protection. In order to make an appropriate HEMP protection filter according to the frequency and type of the antenna, the induced voltage was measured and the maximum induced voltage was analyzed through extrapolation. It was found that the measured induced voltage decreased as the frequency increased, such as in the HF, VHF and UHF bands of the measurement results.
강훈이(Hoon I KANG),강동수(Dong Soo KAKG),김성우(Seong Woo KIM),김명희(Myung Hee KIM),손정호(Jeong Ho SOHN),정길수(Kil Soo CHUNG) 전남대학교 수산과학연구소 1997 수산과학연구소논문집 Vol.6 No.-
This study on the stability of chlorophyll in sea mustard, Undaria pinnatifida, during blanching, salting and air drying was carried out. Raw sea mustard was blanched for 30 seconds in the various temperature. The blanched product was salted with table salt after centrifuged after 48 hours for dewatering. In addition, sea mustard was dried in a drier to make clear the dehydration mechanism during the forced air drying. The drier was designed to controll the temperature, relative humidity and velocity of air. The most effective blanching temperature and time for maximal residual amount of chlorophyll was 90℃ and 30 seconds. The soaking in 1% chemical solution for 20 minutes showed more desirable results than blanching in 1% chemical solution. Oyster shell powder, reed ash and 0.5% Ca(CH₃CO₂)₂with 0.5% MgCO₃solutions were more effective than the 1% solution of other chemicals. The most reasonable ratio of added salt to dewater the product for 48 hours was 25% in w/w. The amount of total organic acid and volatile acids revealed no correlation with the amount of added salt. The optimal condition during drying at 80℃ and 90℃ with different relative humidities was effective at 80℃ with 30% relative humidity.