의과대학/의학전문대학원 학생들의 학습에 대한 신념

박재현,Park, Jaehyun 연세대학교 의과대학 2012 의학교육논단 Vol.14 No.2

Learning in medical school is usually regarded as a very specialized type of learning compared to that of other academic disciplines. Medical students might have general beliefs about their own learning. Beliefs about learning have a critical effect on learning behavior. There are several factors that affect medical students' learning behavior: epistemological beliefs, learning styles, learning strategies, and learning beliefs. Several studies have addressed epistemological beliefs, learning styles, and learning strategies in medical education. There are, however, few studies that have reported on medical students' beliefs about learning. The purpose of this study was to determine what learning beliefs medical students have, what the causes of these beliefs are, and how medical educators teach students who have such beliefs. In this study, the five learning beliefs are assumed and we considered how these beliefs can affect students' learning behaviors. They include: 1) medical students are expected to learn a large amount of information in a short time. 2) memorization is more important than understanding to survive in medical schools. 3) learning is a competition and work is independent, rather than collaborative. 4) reading textbooks is a heavy burden in medical education. 5) the most effective teaching and learning method is the lecture. These learning beliefs might be the results of various hidden curricula, shared experiences of the former and the present students as a group, and personal experience. Some learning beliefs may negatively affect students' learning. In conclusion, the implications of medical students' learning beliefs are significant and indicate that students and educators can benefit from opportunities that make students' beliefs about learning more conscious.

압축 기반 상변화 메모리 시스템에서 저장 위치를 고려한 하이브리드 SLC/MLC 관리 기법

박재현,이형규,Park, Jaehyun,Lee, Hyung Gyu 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.2

Density of Phase-Change Memory (PCM) devices has been doubled through the employment of multi-level cell (MLC) technology. However, this doubled-capacity comes in the expense of severe performance degradation, as compared to the conventional single-level cell (SLC) PCM. This negative effect on the performance of the MLC PCM detracts from the potential benefits of the MLC PCM. This paper introduces an efficient way of minimizing the performance degradation while maximizing the capacity benefits of the MLC PCM. To this end, we propose a location-aware hybrid management of SLC and MLC in compressed PCM main memory systems. Our trace-driven simulations using real application workloads demonstrate that the proposed technique enhances the performance and energy consumption by 45.1% and 46.5%, respectively, on the average, over the conventional technique that only uses a MLC PCM.

PZT 파우더 첨가에 따른 티타늄 파우더/폴리머 콘크리트 복합재료의 진동 특성 및 압축 물성 분석

박재현,김석룡,김경수,김건,김석호,이범주,정안목,안종욱,김선주,이시맥,유형민,Park, Jaehyun,Kim, Seok-Ryong,Kim, Kyoung-Soo,Kim, Geon,Kim, Seok-Ho,Lee, Beom-Joo,Jeong, Anmok,An, Jonguk,Kim, Seon Ju,Lee, Si-Maek,Yoo, Hyeong-Min 한국복합재료학회 2022 Composites research Vol.35 No.3

In this study, Ti powder/Polymer concrete composites were processed by adding the PZT powder, one of the piezoelectric materials, to improve the vibration damping effect of Polymer concrete. Ti powder was added at a constant ratio in order to maximize the vibration damping effect using the piezoelectric effect. Three types of composite material specimens were prepared: a specimen without PZT powder, specimens with 2.5 wt% and 5 wt% of PZT powder. The vibration characteristics and compression properties were analyzed for all specimens. As a result, it was confirmed that as the addition ratio of PZT powder increased, the Inertance value at the resonant frequency decreased due to the piezoelectric effect when the vibration generated from Ti powder/polymer concrete was transmitted. Especially, the Inertance value was decreased by about 19.3% compared to the specimen without PZT at the resonant frequency. The change in acceleration with time also significantly decreased as PZT powder was added, confirming the effect of PZT addition. In addition, through the compression strength test, it was found that the degree of deterioration in compression properties due to the addition of PZT up to 5 wt% was insignificant, and it was confirmed that the powder was evenly dispersed in the composites through the cross-sectional analysis of the specimen.

천연물 추출물이 대식세포 및 호염구 활성 억제에 미치는 영향

박재현,장지민,차상률,백효신,이주연,이유희,류세민,양세란,Park, Jaehyun,Jang, Jimin,Cha, Sang-Ryul,Baek, Hyosin,Lee, Jooyeon,Lee, You-Hui,Ryu, Semin,Yang, Se-Ran 한국식품위생안전성학회 2022 한국식품위생안전성학회지 Vol.37 No.3

Asthma is a chronic inflammatory disease characterized by recurring symptoms, airflow obstruction, and bronchial hyper-responsiveness. The onset of asthma for most patients begins early in life, and current asthma treatment with anti-inflammatory agents can have adverse effects, eventually leading to impaired quality of life. In the pathogenesis of asthma, macrophages and basophils play a vital role during progression. Macrophages not only induce inflammation by secreting inflammatory cytokines but also promote DNA damage and mucus production through nitric oxide (NO) production. Basophils enhance eosinophil recruitment and aggravate asthma through the FcεRIα receptor with high affinity for histamine and IgE. Therefore, in this study, we investigated whether the activation of macrophages and basophils is suppressed by the individual extracts of 28 natural products. RAW 264.7 cells (mouse macrophages) were treated with the natural products in LPS, and 4 natural product extracts resulted in decreased NO production. In β-hexosaminidase assay using RBL-2H3 cells (rat basophils), 19 natural product extracts decreased β-hexosaminidase production. In NO production and β-hexosaminidase assay using macrophages and basophils, 3 natural product extracts (Plantago asiatica, Centella asiatica, and Perilla frutescens var. japonica) significantly inhibited NO production and β-hexosaminidase release. Overall, we examined the inhibitory effects of 28 natural product extracts on macrophage and basophil activity, and the findings demonstrated the potential of natural product extracts for treating asthma and macrophage- and basophil-related diseases.

NVDIMM의 동작 특성 분석 및 개선 방안 연구

박재현,이형규,Park, Jaehyun,Lee, Hyung Gyu 대한임베디드공학회 2017 대한임베디드공학회논문지 Vol.12 No.3

High performance non-volatile memory system can mitigate the gap between main memory and storage. However, no single memory devices fulfill the requirements. Non-volatile Dual In-line Memory Module (NVDIMM) consisted of DRAMs and NAND Flashes has been proposed to achieve the performance and non-volatility simultaneously. When power outage occurs, data in DRAM is backed up into NAND Flash using a small-size external energy storage such as a supercapacitor. Backup and restore operations of NVDIMM do not cooperate with the operating system in the NVDIMM standard, thus there is room to optimize its operation. This paper analysis the operation of NVDIMM and proposes a method to reduce backup and restore time. Particularly, data compression is introduced to reduce the amount of data that to be backed up and restored. The simulation results show that the proposed method reduces up to 72.6% of backup and restore time.

기후변화에 따른 R-Factor 값을 고려한 토양 유실량 평가

박재현,김동주,김민규,장춘화,강현우,금동혁,임경재,Park, Jaehyun,Kim, Dongju,Kim, Minkyu,Jang, Chunhwa,Kang, Hyunwoo,Kum, Donghyuk,Lim, Kyoung 한국관개배수위원회 2014 한국관개배수논문집 Vol.21 No.1

This study evaluated the soil loss considering the R-Factor value following the climate change. To calculate the soil loss of the basin in Jaun-ri, Hongcheon-gun which is the study area, the future climate change scenario and convenience revision were used to build the past 30 years, future 30 years R-Factor and it was applied to USLE model. As a result, as the R-Factor value declined a little in the future, the soil loss was also reduced but it corresponds to the 'very high' according to the OECD soil loss grade so the solution to reduce the soil loss is necessary and it can be used for another study material.

1차원 유동 네트워크 모델 및 다공성매질 모델을 이용한 판형 열교환기의 수치적 연구

박재현(Jaehyun Park),김민성(Minsung Kim),민준기(June Kee Min),하만영(Man Yeong Ha) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.1

A typical heat exchanger, found in many industrial sites, is made up of a large number of unitary cells, which causes difficulties when carrying out full-scale three-dimensional numerical simulations of the heat exchanger to analyze the aero-thermal performance. In the present study, a three-dimensional numerical study using a porous media model was carried out to evaluate the performance of the heat exchanger modelled in two different ways:full-scale and simplified. The pressure drop in the air side and gas side along with the overall heat transfer rate were calculated using a porous media model and the results were then compared to results obtained with a one-dimensional flow network model. The comparison between the results for two different geometries obtained using a porous media model and a one-dimensional flow network model shows good agreement between the simplified geometry and the one-dimensional flow network model. The full-scale geometry shows reasonable differences caused by the geometry such as sudden expansion and contraction.

지역 행사 참여 행태와 목적에 대한 연구: Meetup 플랫폼을 중심으로

박재현(Jaehyun Park),박재혁(Jaehyuk Park),박예진(Jaimie Yejean Park),차미영(Meeyoung Cha) 한국정보과학회 2022 한국정보과학회 학술발표논문집 Vol.2022 No.12

근거리 무선전력전송용 헬리컬 코일과 스파이럴 코일에 대한 고찰

박재현(PARK Jaehyun),양해열(Yang Haeyoul),김창선(KIM Changsun) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.7

수사구조이론(RST)을 활용한 의미 구성 능력 진단 도구의 형식 탐색

박재현 ( Park Jaehyun ),박종훈 ( Park Jonghoon ),윤신원 ( Yoon Shinwon ),이선영 ( Lee Sunyoung ),정민주 ( Chung Minju ) 국어교육학회 2017 國語敎育學硏究 Vol.52 No.1

본 연구에서는 수사구조이론(RST: Rhetorical Structure Theory)을 활용하여 학습자의 텍스트 의미 구성 능력을 진단할 수 있다고 보고, 텍스트 생산자의 의도성이 강한 설득 텍스트를 대상으로 학습자의 의미 구성 능력을 진단할 수 있는 도구의 형식을 탐색하고자 하였다. 이를 위해 진단 도구 개발을 위한 기준과 그에 따른 네 가지 도구의 형식을 설정한 뒤, 초, 중, 고등학교 학습자를 대상으로 네 가지 진단 도구 형식을 적용해 봄으로써 그 타당성을 확인하였다. 그 결과, `진단의 타당성` 측면에서는 네 가지 진단 도구의 형식 모두 학습자들의 중심 내용 설정 능력, 목적과 상황을 고려한 내용 생성 및 조직 능력, 텍스트의 전체 체제와 구조 조망 능력을 진단하는 데 무리가 없는 것으로 확인되었다. 다만, 주어진 내용을 자유롭게 변형할 수 있는 C, D 유형의 결과가 B 유형의 반응과 큰 차이가 없었던 것으로 나타났다. 다음으로 `시행의 용이성` 측면에서는 원고지로 의미 구성 결과를 옮기는 방식을 포함한 C 유형과 D 유형이 A, B 유형에 비해 적합성이 떨어지는 것으로 확인되었다. 즉, 의미 구성 능력을 진단하는 도구를 개발하는 데에 있어서 글쓰기 과정을 포함하는 것이 진단에 직접적인 영향을 미치지 않을 수 있음을 확인하였다. 마지막으로 `자료의 적합성` 측면에서는 A, C 유형이 B, D 유형에 비해 상대적으로 자료 가공이 용이한 것으로 판단되었다. 이상의 결과를 종합해 볼 때, A, B 유형이 C, D 유형에 비해 진단 도구로서 우위를 확보할 것으로 최종 판단하였다. Thinking that learner`s text meaning construction ability can be diagnosed by using RST (Rhetorical Structure Theory), this study intended to investigate a form of diagnostic tool for a learner`s meaning construction ability on persuading text with text producer`s strong intention. To this end, this study established the basis for development of diagnostic tools and the 4 tool forms and then, it applied the 4 diagnostic tool forms to learners at primary, middle and high school to verify the validity. As a result, from the aspect of `validity of diagnosis`, it was found that there was no problem for the 4 diagnostic tool forms to diagnose grasping ability of main contents, contents creation and organization ability considering the purpose and situations, and the whole text system and structure grasping ability of all the learners. However, it appeared that the outcome of C and D patterns which could freely transform the given contents did not have a great difference from the reaction of B patterns. Next, from the aspect of `easy execution`, it was found that C and D patterns which included a method to move meaning construction results to manuscript papers had worse adequacy than A and B patterns. In other words, it was confirmed that inclusion of writing process in development of diagnostic tool for meaning construction ability would not have a direct influence on diagnosis. Finally, from the aspect of `adequate data`, it was believed that A, C patterns were relatively easier in data processing than B, D patterns. Taking above results together, it was finally judged that A, B patterns secured a dominant position over C, D patterns as a diagnostic tool.