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.

보문 : 톱밥 및 농업부산물 이용 배지상에서 노루궁뎅이버섯(Hericium erinaceum)의 균사생장 및 자실체형성

고한규 ( Han Gyu Ko ),박혁구 ( Hyuk Gu Park ),김성환 ( Seong Hwan Kim ),박원목 ( Won Mok Park ) 한국균학회 2004 韓國菌學會誌 Vol.32 No.2

Identity 서비스 제공자를 이용한 e-메일 주소 익명화 서비스

고한규(Han-Gyu Ko),김승현(Seung-Hyun Kim),진승헌(Seung-Hun Jin) 한국통신학회 2006 한국통신학회 학술대회논문집 Vol.2006 No.7

뇌혈관질환의 한양방적인 위험요인 규명 및 진단 표준화 연구를 위한 CRF 및 SOP 개발

고성규(Seong-Gyu Ko),전찬용(Chan-Yong Jun),박종형(Jong-Hyeong Park),한창호(Chang-Ho Han),고호연(Ho-Yeon Ko),윤유식(Yoosik Yoon),최선미(Seon-Mi Choi),김중길,정우상(Woo-Sang Jung),문상관(Sang-Kwan Moon),조기호(Ki-Ho Cho),김영석(Young-Suk 대한한의학회 2006 대한한의학회지 Vol.27 No.1

Analysis of Ball Landing Locations in Grand Slam Matches of Tennis

( Han Eol Kim ),( Koo In Jung ),( Jeon Gyu Ko ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1

Purpose: This study has the objective in assessing the tactical ball locations where the ball landed in the structural characteristics of the professional tennis. In order to analyze the tactical patterns, the ball locations were collected through the whole match and compared 1st round match with semi-final match. Method: Matches were the first round and the semi-final of Australian Open, both played in 2012 respectively. The method used in the study is the convex hull algorithm which is computing the convex hull of a finite set of points in computation of geometry. The reason that this method was used is to clearly analyze a tactical playing area of ball locations of top ranked tennis players and different varying ball locations of professional tennis player. Result: For the tactics analysis both the court location where the ball landed and the area of shots in each section were considered. However if the shot was a serve or out then the shot was not analyzed, only during rallies. We thought that tactics might change when playing against left or right handed players and when playing in the first round and the semi-final. First, in the first round, both winner and loser showed the highest frequency in section 2 (x: 205.74~411.48cm, y: 891.54~1188.72cm) which was 16.03% of total shots and 15.86% respectively. The second highest frequency for both players were the section 4 (x: 205.7~ 411.48cm, y: 594.36~891.54cm) for winner and the section 12 (x: 0~205.74cm, y: 594.36~891.54cm) for the loser. The occupied area of ball locations for winner in section 2 was 3.763m2 and 3.598m2 for loser in the first round, 13.82% and 12.68% respectively. Second, in the semi-final, winner showed the highest frequency in section 4 as 19.39% of total shots and loser showed the highest frequency in section 3 (x: -205.74~-411.48cm, y: 594.36~891.54cm) as 20.25%. The occupied area of ball locations for winner in section 4 was 5.197m2 and for loser in section 3 as 5.245m2, 10.95% and 10.89% respectively. Conclusion: This study has provided a method for dividing the tennis court into 16 sections for calculating the occupied area of ball locations. There is a significant difference in frequency and percentage between the 1st round match and the semi-final match. However, there is no significant difference in the occupied area of ball locations. Winners tended to show a different strategy depending on the opponent`s performance level or right-handed or left-handed.

SoIoT : Toward A User-Centric IoT-Based Service Framework

Ko, In-Young,Ko, Han-Gyu,Molina, Angel Jimenez,Kwon, Jung-Hyun Association for Computing Machinery 2016 ACM transactions on Internet technology Vol.16 No.2

<P>An emerging issue in urban computing environments is the seamless selection, composition, and delivery of user-centric services that run over what is known as the Internet of Things (IoT). This challenge is about enabling services actuated by IoT devices to be delivered spontaneously from the perspective of users. To accomplish this goal, we propose the Service-Oriented Internet of Things (SoIoT), a user-centric IoT-based service framework, which integrates services that utilize IoT resources in an urban computing environment. This framework provides a task-oriented computing approach that enables the composition of IoT-based services in a spontaneous manner to accomplish a user task. Tasks can also be recommended to users based on the available IoT resources in an environment and on the contextual knowledge that is represented and managed in social, spatial, and temporal aspects. These tasks are then bound to a set of service instances and performed in a distributed manner. This final composition ensures the Quality of Service (QoS) requirements of the tasks and is assigned to multiple client devices for the efficient utilization of IoT resources. We prove the practicality of our approach by showing a real-case service scenario implemented in our IoT-based test-bed as well as experimental results.</P>

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.

Long-term chemical castration induces depressive symptoms by suppressing serotonin expression in rats

Han, Jin-Hee,Shin, Mal-Soon,Lee, Jae-Min,Kim, Tae-Woon,Jin, Jun-Jang,Ko, Il-Gyu,Kim, Sung-Eun,Kim, Chang-Ju,Kim, Mia,Rohe, Joo Hwan,Kim, Khae Hawn 한국통합생물학회 2018 Animal cells and systems Vol.22 No.1

Androgen deprivation therapy, also known as chemical castration, has been used as an adjunct to psychotherapy for sex offenders. Goserelin and bicalutamide are drugs used for chemical castration. Serotonin (5-hydroxytryptamine, 5-HT) is a key neurotransmitter involved in mood changes, such as depression. We investigated the effects of surgical and chemical castration on depressive symptoms in rats. Surgical castration was performed through a bilateral orchiectomy. Bicalutamide was administrated orally once a day for 84 consecutive days. Goserelin acetate was implanted subcutaneously into the anterior abdominal wall, and this implantation was repeated 3 times at 28-day intervals. Testosterone levels were detected by enzyme-linked immunosorbent assays. Sexual behaviors were analyzed by measuring mount latency, mount frequency, intromission latency, and intromission frequency. The forced swimming test was performed to evaluate rats' depression status. To detect 5-HT and tryptophan hydroxylase (TPH)-positive cells in the dorsal raphe, immunohistochemistry for 5-HT and TPH and western blotting for 5-HT1A receptors and TPH were performed. Surgical castration and goserelin decreased testosterone levels and suppressed sexual behaviors. However, bicalutamide did not inhibit sexual behaviors, although it reduced testosterone levels to a limited extent. Both surgical and chemical castration induced depression in rats. The expression of 5-HT, TPH, and 5-HT1A receptors in the dorsal raphe was significantly decreased by both surgical castration and chemical castration via bicalutamide and goserelin. The present results showed that surgical and chemical castration for 12 weeks induced a depressive state in rats by inhibiting serotonergic function through 5-HT1A receptors.

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/>