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고압 유체 시료의 pH 및 알칼리도 측정 방법 : 가상 시료를 활용한 실용성 평가
송민석,문수현,채기탁,방준환,Minseok Song,Soohyeon, Moon,Gitak Chae,Jun-Hwan Bang 한국지하수토양환경학회 2024 지하수토양환경 Vol.29 No.1
As part of monitoring technology aimed at verifying the stability of CO<sub>2</sub> geologic storage and mitigating concerns about leakage, a method for measuring the pH and alkalinity of high-pressure fluid samples was established to obtain practical technology. pH measurement for high-pressure samples utilized a high-pressure pH electrode, and alkalinity was measured using the Gran titration method for samples collected with a piston cylinder sampler (PCS). Experimental samples, referencing CO<sub>2</sub>-rich water and CO<sub>2</sub> geologic storage studies, were prepared in the laboratory. The PCS controls the piston, preventing CO<sub>2</sub> degassing and maintaining fluid pressure, allowing mixing with KOH to fix dissolved CO<sub>2</sub>. Results showed a 6.1% average error in high-pressure pH measurement. PCS use for sample collection maintained pressure, preventing CO<sub>2</sub> degassing. However, PCS-collected sample alkalinity measurements had larger errors than non-PCS measurements, limiting PCS practicality in monitoring field settings. Nevertheless, PCS could find utility in preprocessing for carbon isotope analysis and other applications. This research not only contributes to the field of CCS monitoring but also suggests potential applications in studies related to natural analogs of CCS, CO<sub>2</sub>-rock interaction experiments, core flooding experiments, and beyond.
6속 AT 기반 병렬형 HEV의 운전조건에 따른 전동식 오일펌프 제어 알고리즘 개발
송민석(Minseok Song),김용하(Yongha Kim),조치훈(Chihoon Cho),김연호(Yeonho Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Electric oil pump control algorithm for a 6 speed AT based HEV is developed. To evaluate the performance of the EOP control algorithm, a bench tester of AT based 2-shaft parallel HEV is constructed. Using the bench tester, line pressure response is investigated with/without checkball at AT oil pump for various ATF temperature and EOP speed. In addition, performance of the EOP control algorithm is investigated for various ATF temperature and vehicle acceleration. It is found from the experimental results that the EOP control algorithm shows satisfactory performance except the very high temperature and very low acceleration, which requires the modification of the control gains.
플러그인 하이브리드 차량용 전동식 오일펌프의 압력 및 누유 특성 해석
송민석(Minseok Song),오요셉(Joseph Oh),김종현(Jonghyun Kim),이재신(Jaesin Lee),김현수(Hyunsoo Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Pressure and leakage characteristic of an electric oil pump(EOP) for a plug-in hybrid are investigated. First, inlet and outlet volume of a generator type oil pump is obtained based on the chamber area which is created when the inner and outer rotor encounter. And leakage model is constructed for the tip and plate clearance. Using the EOP and leakage model, simulation are performed. It is found from the simulation that the EOP pressure shows oscillatory response due to the geometric characteristics of the chamber volume which varies depending on the rotational angle. In addition, the leakage at each chamber occurs only when the pressure is generated.
비 뇌영상 데이터와 기계학습을 이용한 알츠하이머병 분류
송민석(Minseok Song),정혜윰(Hyeyoom Jung),이승용(Seungyong Lee),이종원(Jongwon Lee),김동현(Donghyeon Kim),안민규(Minkyu Ahn) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
치매 진단을 위해, 의사들은 여러 수기 검사를 먼저 진행한 후 확실한 진단을 위해 의료 영상(Magnetic Resonance Image: MRI) 등을 이용한다. 비용과 시간이 많이 소요되는 MRI 영상을 제외한 수기 검사만으로도 치매를 정확히 진단할 수 있다는 통계적 유의성을 얻고자 본 연구를 진행하였다. Open MRI database 인 ADNI 에서 제공하는 환자의 MRI 영상 이외의 메타데이터를 활용하여 치매를 진단하는 모델을 구성하였다. 진단하는 모델로는 Random Forest Regression 과 Multinomial Logistic Regression 을 사용하여 최대 78%의 정확도를 얻었으며, 각각의 모델로부터 Feature Importance 를 추출하여 치매를 진단함에 있어서 중요한 요소들을 정리해 보았다.
ATM 스위치에서 QoS 보장을 위한 큐 서비스 방식의 설계
송민석(Minseok Song),신현식(Heonshik Shin) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅲ
본 논문에서는 대역폭 할당이 용이한 기존의 WRR (Weighted Round Robin) 큐 서비스 방식을 이용하여 지터 한계 보장이 가능한 Rate-Controlled WRR 큐 서비스 방식을 제안한다. 기존의 WRR은 보장된 할당 대역폭, 남은 대역폭의 용이한 공유, 공평성으로 인하여 대역폭 할당 중심 정책을 사용하는 ATM에 적합한 것으로 알려져 있으나, 지터 한계의 보장이 안되어 버퍼 크기가 일정하지 않는 단점이 있다. 그러나, Rate-Controlled WRR 방식은 WRR 방식에 다중프레임 방식을 적용하여서, 다양한 지터 한계를 적용할 수 있을 뿐만 아니라, 다중 프레임 방식의 지터 한계의 상호 정수배 조건도 극복하게 되었다. 또한 비록 조절기(regulator)를 두었다고 하나, 패킷 보유의 기능만 하므로, 간단하게 구현이 가능해서 고속의 통신망에 적합하다. 아울러 본 논문에서는 ATM의 다양한 서비스 클래스의 QoS 보장을 위해서, CBR 트래픽은 Rate-Controlled WRR를 적용시키고, VBR 트래픽과 비실시간 트래픽도 이에 적합한 큐잉 정책을 적용하여 ATM망에서의 새로운 큐 서비스 방식을 제안한다.
6속 AT 기반 하이브리드 자동차의 모드변환 시 전동식 오일펌프 제어로직 개발
송민석(Minseok Song),김종현(Jonghyun Kim),김연호(Yeonho Kim),이학성(Haksung Lee),김현수(Hyunsoo Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this study, an electric oil pump(EOP) control algorithm was proposed during mode change for a automatic transmission(AT) based parallel hybrid electric vehicle(HEV). From the experiment, it was observed that the engine clutch pressure drops during the mode change and at the steady state because additional flow rate should be supplied for the engagement of the engine clutch. In order to minimize the pressure drop during the mode change and maintain the demanded line pressure after the mode change, a 3 stage EOP control algorithm was suggested and its performance was evaluated by the experiments. It was found that the EOP control algorithm is able to reduce the pressure drop and maintain the target line pressure. In addition, the EOP speed at each stage is determined based on the automatic transmission fluid temperature
송민석(Minseok Song),C.W. G?nther1,W.M.P. van der Aalst,정재윤(Jae-Yoon Jung) 대한산업공학회 2008 대한산업공학회지 Vol.34 No.4
Process mining aims at mining valuable information from process execution results (called “event logs”). Even though process mining techniques have proven to be a valuable tool, the mining results from real process logs are usually too complex to interpret. The main cause that leads to complex models is the diversity of process logs. To address this issue, this paper proposes a trace clustering approach that splits a process log into homogeneous subsets and applies existing process mining techniques to each subset. Based on log profiles from a process log, the approach uses existing clustering techniques to derive clusters. Our approach are implemented in ProM framework. To illustrate this, a real-life case study is also presented.