센서별 시간지연 교차 상관관계를 적용한 GCN 기반의 시계열 데이터 이상 탐지

이강우,김윤영,정성원 한국정보과학회 2023 정보과학회논문지 Vol.50 No.9

Anomaly detection of equipment through time series data is a very important because it can prevent further damage and contribute to productivity improvement. Although research studies on time series data anomaly detection are being actively conducted, but they have the following restrictions. First, unnecessary false alarms occur because correlations with other sensors are not considered. Second, although complete graph modeling and GAT have been applied to analyze the correlation of each sensor, this method requires a lot of time due to the increase in unnecessary operations. In this paper, we propose SC-GCNAD(Sensor-specific Correlation GCN Anomaly Detection) to address these problems. SC-GCNAD can analyze the exact correlation of each sensor by applying TLCC that reflects characteristics of time series data. It utilize GCN with excellent model expressiveness. As a result, SC-GCNAD can improve F1-Score by up to 6.37% and reduce analysis time by up to 95.31% compared to the baseline model.

AUTODYN Interactive Nonlinear Dynamic Analysis Code

이강우 한국전산구조공학회 2001 전산구조공학 Vol.14 No.3

生産·在庫技法의 利用實態에 관한 調査硏究

李康雨 釜山水産大學校 1988 論文集 Vol.40 No.-

This paper conducted a survey on the practices of production and inventory techniques which were currently available in the small companies located in Pusan. One of the primary objectives of the survey was to measure the extent to which the formal techniques and procedures applicable to the field of production and inventory management were intoduced in the managerial practices of the companies. The results of the survey concluded that such sophisticated techniques as regression analysis, economic order quantity, exponential smoothing and material requirement planning, in general, ,had, disappointgly little acceptance among the managers and were not very widely used. Instead, they lacked an theoretically adequate foundation. The pictures and the tables presented in the paper will be very useful for gauging the availability of relevant production and inventory techniques. In this respect this paper is encouraging and holds every concern for continued improvement of small companies in the future.

스포츠의 社會的 機能에 對한 社會學的 패러다임(Paradigm)에 關한 考察

李康雨 동국대학교 대학원 1989 연구논집 Vol.19 No.-

A Caching Mechanism for Remote Queries in Distributed Directory Systems

이강우,Lee, Kang-Woo Korea Information Processing Society 2000 정보처리논문지 Vol.7 No.1

본 논문에서는 분산 디렉토리 시스템에서 질의 처리 속도를 향상시키기 위하여 원격지의 객체에 대한 질의와 결과를 요청지의 캐시에 저장하는 캐싱 메카니즘을 제안한다. 이를 위하여 첫째, 분산 디렉토리 시스템에 저장되는 캐시 정보를 응용 데이터 정보, 시스템 데이터 정보로 분류하고, 분류된 캐시 정보를 기반으로 캐시 시스템 구조를 설계하였다. 둘째, 각각의 캐시에 대한 거리 정보와 접근 회수를 가중치로 부여한 최소-TTL 대체 기법을 개발하였다. 마지막으로 제안된 캐시 기법과 타 기법(LRU, LFU 대체 기법)에 대하여 성능 평가를 수행하여 제안된 기법이 LRU 기법 보다 25%의 성능향상을 보였으며, LFU 기법보다는 30%의 성능향상 결과를 보였다. In this paper, for improving the speed of query processing on distributed directory system, we proposed a caching mechanism which is store the queries and their on the remote site objects in the cache of local site. For this, first, cached information which is stored in distributed directory systems is classified as application data and system data. And cache system architecture is designed according to classified information. Second least-TTL replacement mechanism which uses the weighted value of geographical information and access frequency for replacements are developed for each cache. Finally, performance evaluations are performed by comparing the proposed caching mechanism and other mechanisms (LRU, LFU replacement). Our least-TTL mechanism shows a performance improvement of 25% over the LRU and that of 30% over LFU.

병렬 컴퓨터 시스템 성능 평가를 위한 컴퓨터 시뮬레이션 기술 동향

이강우 동국대학교 산업기술연구원 1999 산업기술논문집 Vol.13 No.-

최근 들어 병렬 컴퓨터 시스템의 설계를 평가하기 위한 컴퓨터 시뮬레이션이 활발하게 연구되고 있다. 본 고는 컴퓨터 시뮬레이션 과정에 포함되는 여러 가지 작업 부하 생성 방법에 대해 살펴본다. 각 방법에 대한 정의, 특징을 살펴본 후 대표적인 구현 사례를 요약해 본다. 먼저 분포 구동 시뮬레이션 방법과 이를 위하여 사용되는 시뮬레이션 언어에 대해 살펴본 후, 트레이스를 이용하는 추적 구동 시뮬레이션 방법과 병렬 컴퓨터 시스템용 트레이스를 생성하는 방법에 대해서 알아본다. 마지막으로 최근에 각광 받고있는 수행 구동 시뮬레이션 방법과 프로그램 구동 시뮬레이션에 대하여 살펴본다. Recently, many research activities on computer simulation technique to evaluate the performance of multiprocessor systems are reported. This paper describes the generation of workloads that are essential in software simulation procedure. Representative implementation examples will follow the summary of the definitions and characteristics of each workload generation methodology. The distribution-driven simulation technique will be given first. Then, the trace-driven and execution-driven simulation techniques will be discussed. Especially, the execution-driven technique will be examined in detail.

디젤엔진으로부터 배출되는 입자상물질의 재생특성

이강우,정덕영,오광중,조경목 대한환경공학회 1994 대한환경공학회 학술발표논문집 Vol.1994 No.12

지식경제부 산업융합원천기술개발사업의 바이오ㆍ의약 분야 지원현황

이강우 한국생물공학회 2011 한국생물공학회 학술대회 Vol.2011 No.10

방광 감압 후 폐쇄 후 이뇨로 오인된 중추성 요붕증

이강우,양철우,임동준,권혁상,강미자,김은숙,윤건호,손호영,차봉연 대한내분비학회 2009 Endocrinology and metabolism Vol.24 No.2

Post-obstructive diuresis after treatment for neurogenic bladder-induced obstructive kidney disease is a common symptom. As polyuria may develop in many other conditions as well, the present case is about a patient with a chief complaint of polyuria accompanied by nocturia, that was initially diagnosed as hydronephrosis due to the presence of neurogenic bladder and bladder dysfunction. The result of the water deprivation test, which was conducted for persistent diluted polyuria, yielded a final diagnosis of central diabetes insipidus, notwithstanding the strong impression of post-obstructive diuresis initially made because of a sudden increase in urine output after an indwelling catheter was inserted for bladder decompression. In post-obstructive diuresis, polyuria actually does compensate for disturbed homeostasis through water and electrolyte diuresis and it does not require specific management. However, in central diabetes insipidus, which resembles manifestations of dilute polyuria, the urine and plasma osmolarity need to be under the strict control of anti-diuretic hormone. In the case of persistent dilute polyuria occurring after obstructive uropathy, underlying diseases such as diabetes insipidus should be taken into consideration. Post-obstructive diuresis after treatment for neurogenic bladder-induced obstructive kidney disease is a common symptom. As polyuria may develop in many other conditions as well, the present case is about a patient with a chief complaint of polyuria accompanied by nocturia, that was initially diagnosed as hydronephrosis due to the presence of neurogenic bladder and bladder dysfunction. The result of the water deprivation test, which was conducted for persistent diluted polyuria, yielded a final diagnosis of central diabetes insipidus, notwithstanding the strong impression of post-obstructive diuresis initially made because of a sudden increase in urine output after an indwelling catheter was inserted for bladder decompression. In post-obstructive diuresis, polyuria actually does compensate for disturbed homeostasis through water and electrolyte diuresis and it does not require specific management. However, in central diabetes insipidus, which resembles manifestations of dilute polyuria, the urine and plasma osmolarity need to be under the strict control of anti-diuretic hormone. In the case of persistent dilute polyuria occurring after obstructive uropathy, underlying diseases such as diabetes insipidus should be taken into consideration.

등속성 스포츠 크리닉 트레이닝이 최대근력과 순발력에 미치는 효과

이강우 안성산업대학교 1998 論文集 Vol.30 No.-

Isokinetic training, via MERAC, was conducted on 5 volleyball players of M University. This prolonged training was designed to improve the players' athletic abilities through strengthening their shoulder The conclusive findings of the study are as follows: 1. The effects of isokinetic sport clinic training (60˚/sec) (1) Shifts in the point of Peak Torque The result of the 9 week training of all 5 subjects revealed the average peak Torque point to be at 173.2℃. The occurred in the proximity of the initial training point of 180˚, resulting in improvements in muscular contraction capabilities. The is an improvement over the 168˚ attained in the 12 week preliminary examination. (2) Shifts in the Torque Curve 3 out of the 5 subjects examined exhibited an increase in their capacity to sustain maximum muscular strength at the peak torque curve. The not only concurs with the findings of the preliminary examination but also confirms that comparable results were attained within a short span of time. The remaining 2 subjects showed a drastic decrease in maximum muscular strength at the peak point. Further long-term training is recommended to remedy this anomaly. 2. The effects of isokinetic maximum strength raining (60˚/sec) (1) Shifts in Peak Torque All 5 subjects submitted to prolonged training at (60˚/sec) showed an average increase ration of 56.5%. This is a dramatic increase form the 32.8% attained in the preliminary examination and shows that a comparatively higher training efficiency was achieved within a short span of time. However, 1 of the 5 subject showed a disappointing increase ration of 23.9%, far below the mean, and supplementary training was recommended. 3. The effects of isokinetic power Training((240˚/sec) 1) Shifts in Peak Torque Rate Prolonged training at (240˚/sec) for improving isokinetic muscular power resulted in all 5 subjects attaining an average increase ration of 56.1%. However, 1 of the 5 subjects only achieved an increase an ration of 42.2%. Since the preliminary examination yielded a 33.1% average rate of increase, a comparatively higher training efficiency was shown to have been achieved within a short span of time. This study amply confirmed the effectiveness of the isokinetic muscular training program. It is the recommendation of this study that this type of training be followed up with secondary and tertiary training, factoring in differences in individual proficiencies, in order to achieve a comparable level of muscular improvement across the board. Hopefully this study will have lead foundation lead foundation for more intensive kinetic studies in the future, from which the athletics can ultimately benefit.