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스마트팜 환경데이터 기반 파프리카 생육 예측 모델 연구
오한별(HanByeol Oh),장경민(KyeongMin Jang),임종현(Jonghyun Lim),이명배(MyeongBae Lee),신창선(ChangSun Shin) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
농업 현장에 적용된 IoT(Internet of Things) 및 통신 시스템 기술은 첨단 농업인 스마트팜으로의 발전을 견인하고 있다. 특히 농업에서 차지하는 비중이 큰 파프리카와 같은 원예작물의 생산성을 향상시키고 생육비용을 줄일 수 있는 데이터 기반의 생육모델 개발 요구가 증가되고 있다. 따라서 본 연구에서는 스마트팜 환경 및 생육 데이터를 활용하여 파프리카의 생육 예측모델을 연구하고자 한다. 스마트팜에서 수집된 환경 및 생육데이터를 전처리하고, 데이터 병합을 진행한다. 이러한 전처리 과정 이후 다중선형회귀(Multiple Linear regression)를 통해 엽장과 엽폭을 분석하여 생육 예측 모델을 제시한다. 분석된 결과값을 활용하면 스마트팜 시스템 환경 운영 및 작물 최적 생육에 필요한 온실 환경제어 시스템의 개선을 기대할 수 있다.
EV 상용차용 히트펌프 시스템 냉방 성능 특성에 관한 연구
전한별(Hanbyeol Jeon),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),한만승(Manseung Han),김종인(Jongin Kim),이호성(Hoseong Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The cooling performance evaluation of heat pump system for light-duty commercial electric vehicle was studied experimentally. In order to identify the cooling performance characteristics of the heat pump for light-duty commercial electric vehicles, it was evaluated by varying the temperature, flow rate of chiller coolant, and electric compressor speed, under the exterior air temperature of 35°C and interior air temperature of 25°C. Increasing the compressor speeds shows the cooling capacity of the system increases by 7.5% on average, and the compressor work by 27% on average. As a result, the system COP(coefficient of performance) decreases by 14.5% on average. Increasing the temperature of chiller coolant shows the cooling capacity of the system increases by 0.07 kW on average, and the compressor work by the compressor increases by 0.15 kW on average. As a result, the system COP decreases by 8.7% on average. Increasing the flow rate of chiller coolant show the cooling capacity of the system increases by 0.03% on average, and the compressor work by the compressor increases by 0.04% on average. As a result, the system COP does not change.
Sex differences in the progression of glucose metabolism dysfunction in Alzheimer’s disease
Park Jong-Chan,Lim Hanbyeol,Byun Min Soo,Yi Dahyun,Byeon Gihwan,Jung Gijung,Kim Yu Kyeong,Lee Dong Young,Han Sun-Ho,Mook-Jung Inhee 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
Alzheimer’s disease (AD) is a common neurodegenerative disease characterized by amyloid plaques and impaired brain metabolism. Because women have a higher prevalence of AD than men, sex differences are of great interest. Using cross-sectional and longitudinal data, we showed sex-dependent metabolic dysregulations in the brains of AD patients. Cohort 1 (South Korean, n = 181) underwent Pittsburgh compound B-PET, fluorodeoxyglucose-PET, magnetic resonance imaging, and blood biomarker (plasma tau and beta-amyloid 42 and 40) measurements at baseline and two-year follow-ups. Transcriptome analysis of data from Cohorts 2 and 3 (European, n = 78; Singaporean, n = 18) revealed sex differences in AD-related alterations in brain metabolism. In women (but not in men), all imaging indicators displayed consistent correlation curves with AD progression. At the two-year follow-up, clear brain metabolic impairment was revealed only in women, and the plasma beta-amyloid 42/40 ratio was a possible biomarker for brain metabolism in women. Furthermore, our transcriptome analysis revealed sex differences in transcriptomes and metabolism in the brains of AD patients as well as a molecular network of 25 female-specific glucose metabolic genes (FGGs). We discovered four key-attractor FGG genes (ALDOA, ENO2, PRKACB, and PPP2R5D) that were associated with amyloid/tau-related genes (APP, MAPT, BACE1, and BACE2). Furthermore, these genes successfully distinguished amyloid positivity in women. Understanding sex differences in the pathogenesis of AD and considering these differences will improve development of effective diagnostics and therapeutic treatments for AD.
전기자동차 히트펌프용 수열원 응축기 성능 특성에 관한 연구
이호성(Hoseong Lee),전한별(Hanbyeol Jeon),조중원(Choongwon Cho),임택규(Taekkyu Lim),이성제(Sungje Lee),남광우(Kwangwoo Nam) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The performance characteristics of coolant-source plate heat exchanger for heat pump system in electric vehicles was studied experimentally. In order to analyze plate heat exchanger with the coolant operating PE(Power Electronics) thermal management, coolant conditions was varied with respect to temperature, volume flow rate. Because the refrigerant in MAC(Mobile Air Conditioning) was about to be changed in our country, performance experiments were carried out for present(R-134a) and alternative(R-1234yf) refrigerants. With increasing coolant volume flow rate in plate heat exchanger, heat rejection rate increased due to refrigerant mass flow rate increment. While heating capacity of R-134a was increased by 78%, that of R-1234yf was increased by 67.5% due to lack of enthalpy difference in high pressure side. In case of coolant temperature, heating capacity with R-134a was decreased by 46.4% from 45℃to 53. 5℃. As a result, because changing refrigerant led to decrease performance, design modification is required to improve heat capacity. Modified plate heat exchanger as a condenser will be studied and plate heat exchanger as an evaporator will be executed experimentally under vehicle operating conditions.
금 입자 증착된 탄소나노튜브의 커패시턴스 증가 및 박막형 이온 선택성 전극으로서의 특성 평가
김도연,손한별,임효령,Do Youn Kim,Hanbyeol Son,Hyo-Ryoung Lim 한국분말재료학회 (*구 분말야금학회) 2023 한국분말재료학회지 (KPMI) Vol.30 No.4
Small-film-type ion sensors are garnering considerable interest in the fields of wearable healthcare and home-based monitoring systems. The performance of these sensors primarily relies on electrode capacitance, often employing nanocomposite materials composed of nano- and sub-micrometer particles. Traditional techniques for enhancing capacitance involve the creation of nanoparticles on film electrodes, which require cost-intensive and complex chemical synthesis processes, followed by additional coating optimization. In this study, we introduce a simple one-step electrochemical method for fabricating gold nanoparticles on a carbon nanotube (Au NP-CNT) electrode surface through cyclic voltammetry deposition. Furthermore, we assess the improvement in capacitance by distinguishing between the electrical double-layer capacitance and diffusion-controlled capacitance, thereby clarifying the principles underpinning the material design. The Au NP-CNT electrode maintains its stability and sensitivity for up to 50 d, signifying its potential for advanced ion sensing. Additionally, integration with a mobile wireless data system highlights the versatility of the sensor for health applications.
Cho, Jangwoo,Cho, Jaehong,Kim, Hyeri,Lim, Minkyung,Jo, Hanbyeol,Kim, Hancheul,Min, Sun-Joon,Rhee, Hakjune,Kim, Jin Woong The Royal Society of Chemistry 2018 GREEN CHEMISTRY Vol.20 No.12
<P>This study introduces a Janus colloid surfactant catalyst platform exhibiting remarkable catalytic activity and magnetic responsiveness in Pickering emulsion microreactors. The patching of catalytic nanoparticles (NPs) such as Pd NPs and Ag NPs on amphiphilic Janus microparticles (JMPs) permits the control of catalytic activity for the organic reactions occurring in emulsion droplets. Through model organic reactions including oxidation, amination, and reduction, we show that the JMP catalysts assemble at the reactant-water interface of Pickering emulsions and play an essential role in enhancing the reaction kinetics and product yields. Moreover, when Fe2O3 NPs were co-patched site specifically, the Pickering emulsion droplets showed magnetic responsiveness, thus leading to facile recovery of products and effective recycling of JMP catalysts. The colloid surfactant catalysts developed in our study are expected to advance the environment-friendly catalyst system for green chemistry.</P>