부하변동이 존재하는 DC 모터의 속도 제어를 위한 외란관측기 설계

김성종,신명준,손영익,김갑일,임승철,강환일 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

This paper considers a speed control problem of DC motor under load variations. In order to reduce the effect of load variation, a disturbance observer has been designed for the given system. With a cheap encoder there exists considerable measurement noise in the velocity feedback and it should be reflected in designing the disturbance observer. The authors have obtained the nominal transfer function of a DC motor and designed a disturbance observer for the control purpose. With the disturbance observer a digital controller has been implemented using a DSP(TMS32OF2812). Some experiments show the enhanced performance of the control system with the proposed method.

응급실에 내원한 자살기도 환자에 관한 연구

김승열,송화식,김갑득,이경규 대한응급의학회 1999 대한응급의학회지 Vol.10 No.4

This study was designed to investigate clinical characteristics and outcome of patient with suicidal attempt. A retrospective analysis by chart review of 130 cases of patients with suicidal attempt who visited emergency department of Dankook University Hospital from January 1998 to December 1998. The results were as follows ; 1. The ratio of patients with suicidal attempt to total patients who visited emergency department was 0.7%. The highest suicidal attempt rates were among aged 20-39. The gender ratio is similar. 2. Suicidal attempt were more common in summer, July, Friday, evening. 3. The most common place of suicidal attempt was home. 4. Drug ingestion was the most common method of suicidal attempt. Drug used for suicidal attempt were agricultural drug including organic phosphorus and carbamate, and therapeutic drug. 5. Common motives of suicidal attempt were marriage conflict, family conflict. 6. The intensity of will to die was more strong in old aged male. 7. Suicidal attempt associated with alcohol drinking was 39.2%. 8. Common symptoms or signs of intoxication were neurological and gastrointestinal.

불량주택지역의 주거환경 개선방향에 관한 연구

정갑식,하성태,김병호,유길준 東亞大學校 建設技術硏究所 1999 硏究論文集 Vol.23 No.1

This study is purposed that the poor environment of house search for the ways of its improvements. The investigation was done through knowing the evaluation of the users and researching on the actual conditions concerning the influence or effect on dwelling environment due to its facilities, qualitative and quantitative levels. As a result of analyzation we can see the dwellers’ evaluation for the common facility and that for the housing environments are in very close relation, and the residents have strong wishes for improvement of their housing environments.

「대학수학능력시험」수리탐구(I)영역에 관한 문제점과 그 개선책에 관한 연구

양승갑,박채리,김병무 명지대학교 자연과학연구소 1998 자연과학논문집 Vol.17 No.-

본 논문은 1994학년도부터 처음으로 시행된 대학 입시제도인 대학수학능력시험에 대한 문제점과 개선책을 알아보는데 목적이 있다. 특히 1996학년도에 시행된 대학수학능력시험에서 수리,탐구(I)영역에 대한 문제를 모두 분석, 조사하여 연구를 수행하였다. The purpose of this study is to find several problems for the mathematical part of the college entrance examination in Korea. In addition, we propose new methods to improve the mathematica part of the exam. The material for the study is highly based on the real entrance exam, given in 1996.

로봇 그립퍼의 악력 제어

윤동우,오성남,김갑일,손영익,임승철,강환일 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

In addition to accurate position and velocity control, force control is necessary for a successful robot operation. In this paper, we have designed a simple robot gripper using a DC motor. For its force control, a current feedback control law is presented without using additional force sensors. Experimental results prove the effectiveness of the proposed control law. A digital controller is also developed with a TMS320LF2406 processor.

이족로봇의 경사면 균형 유지와 보행에 관한 연구

오성남,윤동우,손영익,김갑일,임승철,강환일 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-

This paper aims to provide a way to improve dynamic stability of biped robots against undesirable disturbances and in a slope. By using an angular velocity sensor and an acceleration sensor on its waist, we can make a medium-sized biped robot walk stably in a slope against impulsive disturbances. In addition, it is possible for the robot to walk stably in an unknown slope. The measured signals from the sensor are used for compensating the reference angles of ankle, knee, and pelvis joints. Some experiments show that the stability of the robot is much enhanced by using cheap sensors and a simple algorithm. This work helps biped robots walk more stably in real environments.

Jahn의 Turnen이 現代 器械體操에 미친 影響

정삼현,배정하,서승유,김규환,이동갑,하정호 東亞大學校 附設 스포츠科學硏究所 1997 스포츠科學硏究論文集 Vol.15 No.-

Among the school gymnastics facilities, perhaps the most common ones are gymnastics apparatus. That's why a historic study in the event of havy gymnastics is required. The researchers here have examined the origin of gymnastics with apparatus centered on Jahn's "turen" exercise. The results are as follows : 1. Heavy gymnastics originally contained a lot of elements from field and track events. It had aims of obtaining natural physical movement and enhancing work efficiency. 2. An outdoor event turnen was banned and changed into an inddor event. The fact that apparatus gymnastics is nowadays held indoors reveals the decisive influnece of Jahn's turnen exercise. 3. Jahn's balance beam exercise was at first played for the purpose of blancing oneself and merely for fun. It has developed into the present from through wide distribution and elaboration. 4. Jahn first used the term of parallel bars and the present women's event of parallel bars resembles Jahn's. 5. Jahn's horizontal bars have also had a great effect on today's event of horizontal bars.

두부 외상 환자의 고혈당과 예후와의 상관관계

현석천,이종안,박준석,박상문,김갑득,장인성,김승열,송화식 대한응급의학회 1996 대한응급의학회지 Vol.7 No.2

Severe head injury is associated with a stress response that includes hyperglycemia, which has been shown to worse outcome during cerebral ischemia. To better define the relationship between head injury and hyperglycemia, admission glucose level were analyzed in 150 head injured patients from January 1995 to December 1995. Our retrospective study demonstrated a higher glucose level in patients with low Glasgow Coma Scale(GCS) score, especially at 3-5 GCS score, compared to those with high GCS scores. Also a higher glucose level was noted in patients with vegetative state and dead than in those with good recovery and moderate disability. Hyperglycemia(serum glucose level≥200mg%) was associated with decreased level of consciousness and a poor outcome. We conclude that admission hyperglycemia is a significant indicator of severity of injury(p<0.001), but not significant predictor outcome from head injury. After controlling for the influence of the GCS score, glucose levels do not have an independent effect on outcome.

합성곱 신경망 기반 미세한 책 소리 분류 및 활용

김혜주(Hye-Ju Kim),김승찬(Seung-Chan Kim) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2

소비자들은 도서 구매를 할 때 여러 책을 훑어보면서 관심이 가는 책은 좀 더 꼼꼼히 살펴보는 행동을 하게 된다. 책에 대한 소비자의 관심 정도를 파악하는 방법은 대부분 설문조사를 통해서 이루어진다. 만약 주관적인 설문조사 방식이 아닌 소비자가 책을 어떠한 방식으로 읽고 있는지 정량적으로 파악할 수 있다면 어떤 책이 관심을 끌었는지 쉽게 파악할 수 있을 것이다. 이러한 맥락에서 본 논문에서는 책을 다룰 때 발생하는 미세한 소리에 근거하여 사용자가 책을 다루는 방법을 정량화하고자 한다. 본 연구에서는 예비 연구 (preliminary work)로서 합성곱 신경망 (Convolutional Neural Network)을 이용하여 사용자의 책을 읽는 동작을 미세한 소리에 근거하여 분류 및 예측하는 방법을 제안한다. 타당성 검토를 위해 본 연구에서는 발생된 소리의 시간-주파수 특성을 분석하고자 스펙트로그램으로 표현하고, 이를 합성곱 신경망을 이용하여 학습해 사전 정의된 동작을 예측해냈다. 실험을 통해 책을 통한 8 가지 동작에 대한 분석을 시도하여 소리만으로 사용자의 동작을 정교하게 예측해 냄을 확인하였다.

Effects of Culture Media on Catechins and Caffeine Production in Adventitious Roots of Tea Tree (Camellia sinensis L.)

Yong-Duck Kim,Hak-Gon Kim,Jong-Cheol Kim,Seon Jeong Sim,Ji-Yun Min,Jung-Gyu Hwang,Seung Mi Kang,Hyun-Shik Moon,Jong-Kab Kim,Myung-Suk Choi 경상대학교 농업생명과학연구원 2013 농업생명과학연구 Vol.47 No.1

The influence of the culture media on the growth and catechins and caffeine production was investigated in adventitious root cultures of tea tree. The growth rate of adventitious roots was higher than that of solid medium. Growth rate of adventitious roots was noted to be optimal in N6 liquid medium. Yields of (-)-epicatechin gallate (ECG) and caffeine were the highest when adventitious root cultures were maintained in Nitsch and B5 liquid medium, respectively. The production of (-)-epicatechin (EC) and (-)-epigallocatechin gallate (EGCG) from adventitious roots was maximal when cultured in 1/2MS liquid medium. The adventitious root extracts of tea tree produced on catechins as EC (20.77 mg/g) and EGCG (1.84 mg/g) in 1/2MS medium; EGC (24.39 mg/g) and caffeine (12.97 mg/g) in B5 medium and (-)-epigallocatechin (ECG) (2.16 mg/g) in Nitsch liquid medium.