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교육대학생의 학습량 조사 분석 연구 : 과제물의 양과 해결을 중심으로
고대혁,허 숙,한안진,김규환 仁川敎育大學校 1994 論文集 Vol.28 No.2
University education is not enough with only lectures in order to achieve its educational goals. University is, by definition, a place where inividual academic researches and studies of professors and students are to take place. For this purpose, university students are required to do various kinds of home work, individual study, and report writing. This study tries to investigate the types and amount of individual learning tasks which is provided to the students of Inchon National Teachers University. There are various kinds of individual learning tasks : reading books, finding material, observation and experimentation, skill practice, and report writing. As the results of the study, we can find that : (1) Students are required to take more or less than 10 courses in a semester and every course require 2 or 3 reports. (2) Many students feel that the amount of individual tasks are too heavy to solve within the given time. Especially, the most heavy amount of tasks are given during the third year of university curriculum. (3) Most of the students think that individual study tasks are necessary for university education. But they hope the tasks should be inquiry-oriented rather than memory or mechanical work-oriented. (4) Students want to have a space like Curriculum Material Preparation Area(CMPA) in order to make individual learning tasks.
실용적 뇌파 기반 사용자 인증을 위한 단일 채널 EEG 측정 장비를 통해 수집된 EEG 샘플의 점진적 제거 방법
고한규(Han-Gyu Ko),조진만(Jin-Man Cho),최대선(Daeseon Choi) 한국정보보호학회 2017 정보보호학회논문지 Vol.27 No.2
뇌파 기반 사용자 인증기술은 최근에 스마트폰, 금융 등 다양한 분야에서 사용되고 있는 지문인식 등의 기존 생체인식 인증기술과 비교해볼 때 가변성, 유출 저항성 등의 장점이 있다. 이러한 장점에도 불구하고 사용자로부터 인증에 필요한 뇌파를 수집하기 위해 필요한 장비의 경제성과 뇌파 수집 행위의 편의성 문제 때문에 뇌파 기반 사용자 인증기술이 실제 환경에서 사용되지는 못했다. 최근 하드웨어 기술의 발전으로 휴대성과 통신 기능을 갖춘 간소화 된 형태의 뇌파 수집기기들의 개발로 인해 뇌파를 활용한 인증기술에 대한 관련 연구가 활발히 진행되어왔다. 그러나 본 논문에서 가장 간소화된 형태인 단일 채널 뇌파 측정기기를 통해 수집된 뇌파 샘플들을 대상으로 수행된 실험에 따르면 뇌파 수집 채널 수 감소에 따라 인증정확도의 감소 현상이 있는 것으로 파악되었다. 따라서 본 논문에서는 뇌파 기반 사용자 인증기술의 실용화를 위해 해결해야 할 기술적 문제점에 대해 분석하고 이를 위해서 점진적 뇌파 샘플 제거 방법을 통해 각 사용자의 인증에 유효한 뇌파 샘플 집합을 구성하는 방법을 제안한다. Brainwave-based user authentication technology has advantages such as changeability, shoulder-surfing resistance, and etc. comparing with conventional biometric authentications, fingerprint recognition for instance which are widely used for smart phone and finance user authentication. Despite these advantages, brainwave-based authentication technology has not been used in practice because of the price for EEG (electroencephalography) collecting devices and inconvenience to use those devices. However, according to the development of simple and convenient EEG collecting devices which are portable and communicative by the recent advances in hardware technology, relevant researches have been actively performed. However, according to the experiment based on EEG samples collected by using a single-channel EEG measurement device which is the most simplified one, the authentication accuracy decreases as the number of channels to measure and collect EEG decreases. Therefore, in this paper, we analyze technical problems that need to be solved for practical use of brainwave-based use authentication and propose an incremental elimination method of collected EEG samples for each user to consist a set of EEG samples which are effective to authentication users.
川黃連이 自發性 高血壓 흰쥐(SHR)의 血壓에 미치는 影響
高成奎,高昌男,韓昌澔,金永錫,文祥官,李京燮,曺基湖,裵亨燮 慶熙大學校韓醫科大學韓醫學硏究所 1997 慶熙韓醫大論文集 Vol.20 No.2
In order to investigate the effects of Coptis chenensis FRANCH(川黃連) extract solution on the blood pressure, experimental studies were performed on the blood pressure in normal rats, SHRs. The results were as follows. 1. Coptis chenensis FRANCH(川黃連) extract solution showed significantly effect of asing odecren the mean blood pressure in normal rats. 2. Coptis chenensis FRANCH(川黃連) extract solution showed significantly effect of decreasing on the systolic blood pressure in SHRs. 3. Coptis chenensis FRANCH(川黃連) extract solution was dilated on the isolated aorta in rabbits. 4. Coptis chenensis FRANCH(川黃連) extract solution showed significantly inhibitory effect of ACE in vitro. 5. The mechanism of the antihypertensive effect on Coptis chenensis FRANCH(川黃連) seems due to vasodilatation. According to the above results, it was recognized that Coptis chenensis FRANCH(川黃連) showed significantly antihypertensive effect in normal rats and SHRs. And the mechanism of the antihypertensive effect on Coptis chenensis FRANCH(川黃連) seems due to vasodilatation and ACE inhibition(in vitro).
Hypothermia alleviates hypoxic ischemia-induced dopamine dysfunction and memory impairment in rats
Ko, Il-Gyu,Cho, Han-Jin,Kim, Sung-Eun,Kim, Ji-Eun,Sung, Yun-Hee,Kim, Bo-Kyun,Shin, Mal-Soon,Cho, Seh-Yung,KimPak, Young-Mi,Kim, Chang-Ju The Korean Society for Integrative Biology 2011 Animal cells and systems Vol.15 No.4
Hypoxic ischemia injury is a common cause of functional brain damage, resulting from a decrease in cerebral blood flow and oxygen supply to the brain. The main problems associated with hypoxic ischemia to the brain are memory impairment and dopamine dysfunction. Hypothermia has been suggested to ameliorate the neurological impairment induced by various brain insults. In this study, we investigated the effects of hypothermia on memory function and dopamine synthesis following hypoxic ischemia to the brain in rats. For this purpose, a step-down avoidance task, a radial eight-arm maze task, and immunohistochemistry for tyrosine hydroxylase (TH) and 5-bromo-2'-deoxyuridine (BrdU) were performed. The present results indicated that the hypoxic ischemia-induced disturbance of the animal's performances and spatial working memory was associated with a decrement in TH expression in the substantia nigra and striatum, and an increase in cell proliferation in the hippocampal dentate gyrus. Hypothermia treatment improved the animals' performance and spatial working memory by suppressing the decrement in TH expression in the substantia nigra and striatum and the increase in cell proliferation in the dentate gyrus. We suggest that hypothermia can be an efficient therapeutic modality to facilitate recovery following hypoxic ischemia injury to the brain, presumably by modulating the dopaminergic cell loss.
Closha: bioinformatics workflow system for the analysis of massive sequencing data
Ko, GunHwan,Kim, Pan-Gyu,Yoon, Jongcheol,Han, Gukhee,Park, Seong-Jin,Song, Wangho,Lee, Byungwook BioMed Central 2018 BMC bioinformatics Vol.19 No.-
<P><B>Background</B></P><P>While next-generation sequencing (NGS) costs have fallen in recent years, the cost and complexity of computation remain substantial obstacles to the use of NGS in bio-medical care and genomic research. The rapidly increasing amounts of data available from the new high-throughput methods have made data processing infeasible without automated pipelines. The integration of data and analytic resources into workflow systems provides a solution to the problem by simplifying the task of data analysis.</P><P><B>Results</B></P><P>To address this challenge, we developed a cloud-based workflow management system, Closha, to provide fast and cost-effective analysis of massive genomic data. We implemented complex workflows making optimal use of high-performance computing clusters. Closha allows users to create multi-step analyses using drag and drop functionality and to modify the parameters of pipeline tools. Users can also import the Galaxy pipelines into Closha. Closha is a hybrid system that enables users to use both analysis programs providing traditional tools and MapReduce-based big data analysis programs simultaneously in a single pipeline. Thus, the execution of analytics algorithms can be parallelized, speeding up the whole process. We also developed a high-speed data transmission solution, KoDS, to transmit a large amount of data at a fast rate. KoDS has a file transfer speed of up to 10 times that of normal FTP and HTTP. The computer hardware for Closha is 660 CPU cores and 800 TB of disk storage, enabling 500 jobs to run at the same time.</P><P><B>Conclusions</B></P><P>Closha is a scalable, cost-effective, and publicly available web service for large-scale genomic data analysis. Closha supports the reliable and highly scalable execution of sequencing analysis workflows in a fully automated manner. Closha provides a user-friendly interface to all genomic scientists to try to derive accurate results from NGS platform data. The Closha cloud server is freely available for use from http://closha.kobic.re.kr/.</P>
Decoupling Control of Induction Motors with Rotor Resistance Adaptation
GYU-SIK KIM,IN-JOONG HA,MYOUNG-SAM KO,HAN-KYOUNG BAE,JEONG-GYUN KIM,NO-CHAN KWAK 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
In this paper, we attempt to control induction motors with maximum power efficiency as well as high dynamic performance by means of decoupling of motor speed (or motor torque) and rotor flux. For maximum power efficiency, the squared rotor flux is adjusted according to a minimum power search algorithm until the measured power input reaches the minimum. Since the motor speed is dynamically decoupled from the rotor flux, this can be done successfully without any degradation of motor speed responses. Our controller depends on rotor resistance but not on stator resistance. However, the performance of our control scheme is robust with respect to variations in rotor resistance because an identification algorithm for rotor resistance is employed.<br/>