Implementation of ZUPT on RPA Navigation System for GNSS Denied Ground Test

Hyeoncheol Shin 사단법인 항법시스템학회 2020 Journal of Positioning, Navigation, and Timing Vol.9 No.2

In this paper, Zero velocity UPdaTe (ZUPT) is implemented on the navigation system of Remotely Piloted Aircraft for GNSS denied environment. RPA’s navigation system suffers from lack or loss of satellite signal while maintenance or ground test inside a hangar. Although some of the hangars install GPS repeaters for indoor tests, the anti-jamming equipment with array antenna blocks the repeater signal regarding them as hostile jamming signal. With ZUPT, an aircraft navigation system can be tested free from the divergence of navigation solution without line-of-sight satellites. The designed ZUPT aided centralized Kalman Filter is implemented on the Embedded GPS&INS and simulated with Captive Flight Test data. The simulation result shows stable navigation solution without GNSS updates.

U-Pb fractionations affecting the step-leaching : Reappraisal of U-Pb allanite inclusion age in garnet from the Ogcheon metamorphic belt

Hyeoncheol Kim,Changsik Cheong,Moonsup Cho 대한지질학회 2006 대한지질학회 학술대회 Vol.2006 No.

Purification, crystallization and X-ray crystallographic analysis of mesodiaminopimelic acid decarboxylase from Corynebacterium glutamicum

Hyeoncheol Francis Son,Kyung-Jin Kim 한국구조생물학회 2017 Biodesign Vol.5 No.2

meso-Diaminopimelic acid decarboxylase from Corynebacterium glutamicum (CgDAPDC) is the key enzyme for the production of L -lysine and it catalyzes meso-DAP to produce the final product, L -lysine. The CgDAPDC was overexpressed and purified to homogeneity by Ni-NTA affinity and size-exclusion chromatography. The CgDAPDC protein was crystallized using sitting-drop vapor-diffusion method in the presence of 0.8 M sodium citrate tribasic and 0.1 M sodium cacodylate, pH 6.5 at 293 K. X-ray diffraction data were collected to a maximum resolution of 2.4 Å. The crystal belonged to space group P2 1 2 1 2, with unit cell parameters a = 114.54 Å, b = 91.702 Å, c = 95.161, α = β = γ = 90°. With one molecules per asymmetric unit, the crystal volume per unit protein mass was 2.64 Å 3 Da -1 , which correspond to a solvent content of approximately 53.37%.

Ratio Estimation of Indirect Cost Sector about Defense Companies by Statistic Technique

Hyeoncheol Lim(임현철),Suhwan Kim(김수환) 한국산업경영시스템학회 2017 한국산업경영시스템학회지 Vol.40 No.4

In the defense acquisition, a company’s goal is to maximize profits, and the government’s goal is to allocate budgets efficiently. Each year, the government estimates the ratio of indirect cost sector to defense companies, and estimates the ratio to be applied when calculating cost of the defense articles next year. The defense industry environment is changing rapidly, due to the increasing trend of defense acquisition budgets, the advancement of weapon systems, the effects of the 4th industrial revolution, and so on. As a result, the cost structure of defense companies is being diversifying. The purpose of this study is to find an alternative that can enhance the rationality of the current methodology for estimating the ratio of indirect cost sector of defense companies. To do this, we conducted data analysis using the R language on the cost data of defense companies over the past six years in the Defense Integrated Cost System. First, cluster analysis was conducted on the cost characteristics of defense companies. Then, we conducted a regression analysis of the relationship between direct and indirect costs for each cluster to see how much it reflects the cost structure of defense companies in direct labor cost-based indirect cost rate estimates. Lastly a new ratio prediction model based on regularized regression analysis was developed, applied to each cluster, and analyzed to compare performance with existing prediction models. According to the results of the study, it is necessary to estimate the indirect cost ratio based on the cost character group of defense companies, and the direct labor cost based indirect cost ratio estimation partially reflects the cost structure of defense companies. In addition, the current indirect cost ratio prediction method has a larger error than the new model.

Crystallization of Local Anesthetics When Mixed With Corticosteroid Solutions

Hyeoncheol Hwang,Jihong Park,Won Kyung Lee,Woo Hyung Lee,이자호,Jin Joo Lee,Sun G. Chung,Chaiyoung Lim,Sang Jun Park,Keewon Kim 대한재활의학회 2016 Annals of Rehabilitation Medicine Vol.40 No.1

Objective To evaluate at which pH level various local anesthetics precipitate, and to confirm which combination of corticosteroid and local anesthetic crystallizes.Methods Each of ropivacaine-HCl, bupivacaine-HCl, and lidocaine-HCl was mixed with 4 different concentrations of NaOH solutions. Also, each of the three local anesthetics was mixed with the same volume of 3 corticosteroid solutions (triamcinolone acetonide, dexamethasone sodium phosphate, and betamethasone sodium phosphate). Precipitation of the local anesthetics (or not) was observed, by the naked eye and by microscope. The pH of each solution and the size of the precipitated crystal were measured.Results Alkalinized with NaOH to a certain value of pH, local anesthetics precipitated (ropivacaine pH 6.9, bupivacaine pH 7.7, and lidocaine pH 12.9). Precipitation was observed as a cloudy appearance by the naked eye and as the aggregation of small particles (<10 m) by microscope. The amount of particles and aggregation increased with increased pH. Mixed with betamethasone sodium phosphate, ropivacaine was precipitated in the form of numerous large crystals (>300 m, pH 7.5). Ropivacaine with dexamethasone sodium phosphate also precipitated, but it was only observable by microscope (a few crystals of 10–100 m, pH 7.0). Bupivacaine with betamethasone sodium phosphate formed precipitates of non-aggregated smaller particles (<10 m, pH 7.7). Lidocaine mixed with corticosteroids did not precipitate.Conclusion Ropivacaine and bupivacaine can precipitate by alkalinization at a physiological pH, and therefore also produce crystals at a physiological pH when they are mixed with betamethasone sodium phosphate. Thus, the potential risk should be noted for their use in interventions, such as epidural steroid injections.

The Effect of a Hybrid Method for Indoor Location

Hyeoncheol Zin,HyunJin Park,ChongGun Kim 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8

Raman Spectroscopy and Photocurrent of GaAsN/GaAs Multiple Quantum Wells

Hyeoncheol Kim,Kyu-Hwan Shim,Tae Soo Jeong,Sukill Kang,Taek Sung Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2

The Raman and photocurrent of the GaAsN/GaAs multiple quantum wells (MQWs) was studied. The Raman spectra areobserved to be dominated by the GaAs longitudinal optical (LO) phonon mode as the strongest peaks show up around287–292 cm -1 . Moreover, the weak and broad spectral features in the range of 265–270 cm -1 originate from the peaks associatedwith the GaAs transverse optical (TO) phonon mode. And, the peaks observed in the photoluminescence and thephotocurrent spectra were preliminarily assigned to electron–heavy hole (e 1 –hh) and electron–light hole (e 1 –lh) fundamentaltransitions. Two additional transitions related to MQWs region are observed other than transitions involving the ground state. The structural properties of GaAsN/GaAs MQWs were investigated by using high-resolution X-ray diff raction (HRXRD).

Thermal metamorphism of volcanic rocks on Barton Peninsula,King George Island, Antarctica

Hyeoncheol Kim,Moonsup Cho,Jong-Ik Lee 한국지질과학협의회 2002 Geosciences Journal Vol.6 No.4

Barton Peninsula is mainly composed of Tertiarymetavolcanic rocks and granodiorite. The metavolcanic rocksunderwent thermal metamorphism up to upper greenschist facies,producing calcic-amphibole (Amp), epidote, chlorite (Chl), calcite(Cc), plagioclase, prehnite and laumontite. Two metamorphic zones,Cc-Chl and Amp-Chl, are defined on the basis of mineral assem-blages (+plagioclase, quartz, opaque minerals), characterized byepidote+chlorite calcite and actinolite hornblende+epidote+chloritecalcite, respectively. The distribution coefficient of Mg-Fe* (totalFe) between actinolite and chlorite, defined by KD=(Mg/Fe*)Act/(Mg/Fe*)Chl, ranges from 0.56 to 1.03, suggesting low-pressure meta-morphism. The coexistence of actinolite and oligoclase also sup-ports low-pressure metamorphism. Chlorite geothermometry andT-XCO2 analysis suggest that metamorphic temperatures reachedca. 300oC at fluid pressures less than 1 kbar. Thermal metamor-phism in Barton Peninsula probably was associated with mag-matic-arc plutons emplaced during the Tertiary subduction of thesoutheast Pacific plate under Antarctic Peninsula.

Reduction Effect of Microorganisms by Nano Plasma ion (NPi)

HyeonCheol Kang(강현철),HanSeong Yun(윤한성),Bong Jo Sung(성봉조),Sung Hwa Lee(이성화),Jang Woo Lee(이장우),Yong Bae Seo(서용배),Myung-Suk Lee(이명숙) 한국생명과학회 2011 생명과학회지 Vol.21 No.12

Nano plasma ion (NPi) generator에서 발생한 NPi의 미생물에 대한 살균 효과를 측정하기 위해 미생물 종류, 조사 시간, 챔버 용적, 이온 수량, 거리에 따라 실험 하였다. 먼저 6종의 미생물 Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium, Klebsiella pneumoniae, Staphylococcus aureus, Bacillus subtilis를 대상으로 실험한 결과 미생물 종류에 따라 각각 다른 감소율을 나타냈으며, 그람 음성균인 E. coli가 96.57%로 가장 높았고, 그람 양성균 중 포자를 생성하는 B. subtilis가 57.41%로 가장 낮았다. 그리고 NPi 조사시간에 따라 살균력 측정한 결과, 반응 초기에 대부분의 미생물이 사멸하였으며 이후 서서히 증가하였다. 또한 챔버의 크기에 따른 E. coli의 감소율을 비교하였으며 0.005 ㎥부터 30 ㎥까지 5개 챔버에서 NPi를 2시간 조사한 결과 용적이 증가함에 따라 포화이온 농도는 낮아졌고 이와 함께 살균력도 감소하였다. 이에 1 ㎥ 챔버에 NPi generator를 추가로 설치하여 포화이온농도에 따른 E. coli의 감소율을 알아보았고 포화 이온 농도가 증가함에 따라 감소율도 함께 증가하는 것으로 나타났다. 마지막으로 NPi generator의 거리에 따른 E. coli의 감소율을 확인하였고 이온이 직접적으로 분출되는 부분의 99.19%를 제외한 나머지 위치에서 팬에 의한 이온 순환으로 포화농도가 비슷하게 유지 되었으며 약 97%의 감소율을 나타냈다. The bactericidal effect of nano plasma ion (NPi) which was generated by NPi was analyzed using different kinds of microorganisms, exposure times, chamber sizes, ion amounts and distance. As the result of Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium, Klebsiella pneumoniae, Staphylococcus aureus and Bacillus subtilis were shown different in decrement. Gram-negative bacteria E. coli showed the highest percentage (96.57%) and Gram-positive bacteria B. subtilis which produced spore has the lowest percentage (57.41%). From the exposure time of NPi most of the microorganisms were extinct at an early stage. According to the size of the chamber we compared the loss of E.coli and the experiment result shown, analyzed NPi using 5 chambers 0.005 ㎥ to 30 ㎥ for 2 hr, that when volume of the chamber increased, saturation ion and bactericidal effect was decreased. In addition, an NPi generator installed in the 1 ㎥ chamber investigated the decrement of E. coli. Saturation ion concentration increased with decrement. Finally, E. coli showed a similar reduction according to the distance from NPi generator.

The Yugu Peridotite : A Preliminary Field Study

Hyeoncheol Kim,Bill Fitches,Moonsup Cho 대한지질학회 2004 대한지질학회 학술대회 Vol.2004 No.10