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유기산, 산화음이온 및 금속 산화물 간의 근권 내 상호작용 연구를 위한 계산화학과 적외선 분광학에 관한 총설
한준호(Junho Han),노희명(Hee-Myong Ro) 대한환경공학회 2017 대한환경공학회지 Vol.39 No.7
이 총설은 근권에서 일어나는 유기산, 산화음이온, 그리고 금속 산화물 간의 상호작용을 이해하는데 활용하고 있는 적외선 분광학과 계산화학에 대한 기본적 원리, 역사, 적용 분야, 장점, 그리고 단점에 대해 최근 연구들을 바탕으로 요약하였다. 식물의 유기산과 금속 산화물은 토양 환경에서 산화음이온의 유효도와 이동성을 결정하기 때문에, 산화음이온의 환경내 거동을 이해하기 위해서는 계면에서 이들의 상호작용을 이해하는 것이 중요하다. 적외선 분광학의 감쇠 전반사 기법은 계면에서 일어나는 화학적인 반응을 측정하는 강력한 도구이지만, 광학적 특성들이 실험 설계와 대상에 따라 매우 다르게 나타날 수 있으므로 이를 이용한 측정은 까다롭다. 전반사에 의해 발생하는 소멸파의 침투 깊이가 가장 중요한 매개 변수인데, 침투 깊이는 적외선의 입사각과 대상 파장, 그리고 매질의 굴절률에 따라 결정된다. 또한, 적외선을 이용하여 계면에서의 화학반응을 분석할 때 겹쳐서 발생하는 스펙트럼을 해석하는 것 역시 큰 문제이기 때문에, 겹쳐 나타나는 스펙트럼을 해석하여 밴드를 검출하고, 이 스펙트럼을 deconvolution하는 것이 필수적이다. 본 총설에서는 적외선스펙트럼을 처리하는 기본적인 절차와, 밴드 검출에 사용하는 네가지 방법인 도함수 분광학과 이차 상관 분광학, multivariate curve resolution, 계산 화학을 액체상에 존재하는 인산염 종분화로 설명하였다. 스펙트럼 처리와 계산 화학을 조합하였을 때 간단한 계에서 측정한 겹쳐진 스펙트럼 결과는 해석할 수 있었지만, 자연과 같은 복잡계에서 측정한 겹쳐진 스펙트럼을 해석하는 것은 여전히 불가능한 상황이다. 그러나 향후 분석 및 신호 처리 기술 발달에 따라 복잡계뿐만 아니라 자연계에서 일어나는 계면 반응을 해석할 수 있을 것으로 기대한다. This review summarizes advantage and limitation in infrared spectroscopy and computational chemistry to understand rhizospheric interaction among organic acids, oxyanions and metal oxides. Since organic acids and metal oxides determine dynamics of oxyanions in the soil environment, knowledge of fundamental mechanisms is a prerequisite for understanding the interactions at soil-water interface. Attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR) is a powerful tool to measure the interfacial reactions. However, the ATR-FTIR measurements are abstruse, because the optical characteristics for measurements are variable depending on the experimental setup. In addition, spectral overlapping is a primary obstacle to the analysis of the interfacial reaction; thus, it is essential to detect and to deconvolute bands for signal interpretation. In this review, we expained the fundamental principle for spectrum processing, and four band identification methods, such as derivative spectroscopy, two-dimension correlation spectroscopy, multivariate curve resolution, and computational chemistry with example of aqueous phosphate speciation. As a result, spectrum processing and computational chemistry improved interpretation and spectral deconvolution of overlapped spectra in relatively simple systems, but it was still unsatisfactory for the problems in more complexed system like nature. Nevertheless, we believed that our challenge would contribute practically to develop adequate analytical procedure, signal processing and protocols that could help to improve interpretation and to understand the interfacial interactions of oxyanions in natural systems.
비만 중년여성의 발목 근력과 균형에 대한 고유감각훈련과 근력강화훈련의 효과 비교
한준호 ( Han Junho ),이효정 ( Lee Hyojeong ) 대한통합의학회 2018 대한통합의학회지 Vol.6 No.1
Purpose : The purpose of this study is to comparison of the effects of proprioception traning and muscle strength traning on the ankle strength and balance of obese middle-aged woman. Method : The subjects of this study are obese-middle aged woman; 8 woman who agreed with this research, were picked up. Participants were divided randomly into equal groups: experimental group receved proprioception traning for 6 weeks, which consists of 3 times per week, 30 min for each session. control group received strength training during the same period. Muscle strength and balance were measured dorsi flexion, plantar flexion, functional reach test and one leg standing. The intervention were compared by measuring before and after. Result : There were significant improvements in the subscales of the muscle strength of both group and balance test of those who practiced with the proprioception traning, while the muscle strength traning showed significant changes only muscle strength. Conclusion : Therefore, proprioception training is beneficial in improvement of to improve the muscle strength and balance in middle-aged woman with obesity.
불안정 지지면과 안정 지지면에서의 발목균형훈련이 비만중년여성의 고유수용성감각, 균형 및 근력에 미치는 영향
한준호 ( Han Junho ),이효정 ( Lee Hyojeong ) 대한통합의학회 2018 대한통합의학회지 Vol.6 No.3
Purpose : The purpose of this study was to compare the effects of ankle balance training on unstable and stable surfaces to discover on which surface the proprioception, balance and muscle strength of obese middle aged women improves more. Method : Thirty obese middle-aged women were randomly recruited and divided into two groups (training on an unstable surface, training on a stable surface). The subjects in each group participated in the training for six weeks, three times per week for 30 minutes each session. Proprioception was measured using Dualer IQ digital inclinometer; sway length (SL) and sway area (SA) of center of pressure, and limit of stability (LOS) were measured for balance; muscle strength before and after the training was measured using manual muscle testing. Results : There were significant improvements in the subscales of the proprioception, balance and muscle strength in those who participated in ankle balance training on the unstable surface, and in those who participated on the stable surface. However, before and after the intervention, there were no differences between those who had the balance traning on the unstable surface and those who had the balance traning on the stable surface. Conclusion : Unstable and stable surface ankle balance training are both effective in improving the proprioception, balance and muscle strength of obese middle-aged woman.
탄산염 혹은 황화물 풍부 조건의 하수 처리 과정을 모사한 환경에서 산화아연 (ZnO) 나노입자의 구조 변환 연구
이서연 ( Seoyeon Lee ),한준호 ( Junho Han ),노희명 ( Hee-Myong Ro ) 한국환경분석학회 2021 환경분석과 독성보건 Vol.24 No.2
Developmentofnanotechnologyhasledtotheextensiveapplicationofmetal-oxidenanoparticles(NPs)inindustry,anditcausetoxicityandarisktoecosystemsandhumanhealththroughunidentifiedpathways.Zincoxide(ZnO)isoneofthemostversatileNPs,whichcausesseveredirectandindirecttoxicityupontransformationbyenvironmentalfluctuations.Inthisstudy,thetransformationofZnONPswasexaminedinartificialsewage,whereinthesewagetreatmentprocesswassimulatedusingeithercarbonateorsulfide,underoxicandanoxicconditions.Dynamiclightscattering,transmissionelectronmicroscopy,X-raydiffraction(XRD),X-rayphotoelectronspectroscopy(XPS)wereemployedtoidentifythemorphologyandstructureoftheNPs.TheresultsindicatethatadecreasinginpHandionicstrengthcausestheaggregationofZnONPs,andthecarbonate-richconditionleadstothegrowthofasphericalcrystalintoarectangleform,withoutchangingthecrystalstructure.XRDandXPSanalysisrevealedthatZnONPstransformintothesmallerZnSNPs,sphalerite,undersulfide-richandanoxicconditions.ThisimpliesthatsewagetreatmentwouldcausethetransformationofZnONPsintoZnSNPs,whichhavehighercolloidalstabilityanddissolutionrate;therefore,thetransformationofNPsshouldbecarefullyexaminedandassessedforabetterunderstandingandsafeapplication.
송태호(Taeho Song),한준호(Junho Han),김영춘(Youngchoon Kim) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
It is generally known that wet clutch is being used in many parts of the automotive fuel economy, such as transmissions, limited slip differential, and 4-wheel drive. Owing to oil, the structure is complicated when designing due to oil, and there is a limit to reducing the weight. Also, the use of fabrication oil slows down the reaction and does not provide efficient power transmission. There is a need for a new way to respond to the situation instantly and make to lightweight. In this study, we developed an experimental system to control the rotational speed according to the friction torque using a motor to make the multi-plate clutch electrically. And we try to implement clutch drive by new method through steady state experiment and transient state experiment.