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.

구조광 기반의 3차원 스캐너를 이용한 눈썹주름근과 위입술올림근의 계측

이강우,이형진,위영준,김희진 대한체질인류학회 2018 대한체질인류학회 학술대회 연제 초록 Vol.61 No.-

(주)SK : CoP를 통한 문제해결 그리고 지식자산화 ; SK(주)의 CoP 사례

이강우 한국지식경영학회 2007 지식경영 학술심포지움 Vol.18 No.-

난분해성 액상폐기물 처리를 위한 열분해 기술

이강우,석민광,문동현 한국공업화학회 2007 한국공업화학회 연구논문 초록집 Vol.2007 No.-

문서적 특성을 갖는 XML을 위한 데이터 모델에 관한 연구

이강우 한라대학교 2006 論文集 Vol.9 No.-

As XML is considered as a standard to represent and exchange data on the web, there are many researches to develop applications based on XML Along with these trends, many researches are on going to develop the techniques on storing and searching XML documents But the data models in these researches mainly focus data-centric XML and cannot support document-centric XML fully A data model for document-centric XML document is proposed in this paper Using the proposed model, it is possible to represent the semantic and structural information of XML document fully And a algebra for the proposed model is also proposed as the foundation for query language and query processing

ns-2 시뮬레이터를 이용한 은닉 노드와 CCA 지연 알고리즘이 IEEE 802.15.4 네트워크의 성능에 미치는 영향 분석

이강우,현규완,신연순,안종석,Lee, Kang-Woo,Hyun, Gyu-Wan,Shin, Youn-Soon,Ahn, Jong-Suk 한국정보처리학회 2009 정보처리학회논문지 C : 정보통신,정보보안 Vol.16 No.3

본 논문에서는 IEEE 802.15.4의 성능을 정확하게 평가하기 위하여 ns-2에 추가한 두 가지 기능을 소개한다. 첫째는 전체 노드의 수와 은닉 노드의 수가 정해짐에 따라 노드들의 배치를 자동으로 결정하는 은닉 노드 배치 방안과 은닉 노드로 인한 신호 충돌을 구별하는 방안이다. 둘째는 2003 표준만 구현되어 있는 현재의 ns-2 2.33 버전에 2006 표준에 기술된 CCA 지연 처리 방안을 구현하였다. 기능이 확장된 ns-2를 이용하여, 802.15.4 네트워크의 성능에 은닉 노드와 CCA 지연에 대한 처리 방안이 미치는 영향을 정확하게 분석할 수 있게 되었다. 시뮬레이션 결과 은닉 노드가 없을 때에 비하여 은닉 노드가 단 하나 존재할 때 네트워크 처리량이 약 66% 감소하며, 충돌율은 65%에서 90%로 급증한다. CCA 지연 처리 알고리즘의 2003 표준과 2006 표준에 따르면, 충돌 확률은 약 19%까지 차이를 보이고, 처리량은 약 38% 차이를 보이며 2006 버전이 우수한 성능을 보인다. This paper introduces two functions added to the current version of ns-2 simulator for better accuracy of IEEE 802.15.4 network simulations. The first one is to automatically place hidden nodes over the ring topology in which the coordinator is centered, when the number of hidden nodes and total number of nodes is given. Collisions of signals can be distinguished into the trace file according to the ways of participation of hidden nodes. The second one is the CCA deferment algorithm described in IEEE 802.15.4-2006 standard which is not implemented in the current version of ns-2. Owing to these additional functions, we can carry out the precise analysis of the performance effects of hidden nodes and CCA deferment algorithm on 802.15.4 networks. Simulation results present at least 66% of performance degradation in throughput and drastic increase of collision probability up to 90% from 65% by just a single hidden node. Besides, 2006 standard for CCA deferment algorithm gives 19% lower collision probability and 38% higher performance.

在庫모델에 關한 시뮬레이숀 硏究

李康雨 釜山水産大學校 1980 論文集 Vol.25 No.-

In general, an optimal inventory policy is sensitive to the form of inventory costs, demands of goods and delivery times of each stock point, so that until now types of inventory policies have examined and studied for several authors, i.e. Fred Hannssman, M. M. Connors and Summer Aggarwal. The inventory model analyzed in this paper assumes a Series-type Multi-stage Inventory Model with emergency handling of shortages at a premium cost. In the model demands and delivery times of each stock point are respectively defined as a normal distribution and an arbitrary probability distribution. We show at first a criterion for selecting the optimal ordering points and ordering quantities of each stock point is formulated by maximizing the expected profit per unit time, and then an algorithm for computing the optimal ordering points and ordering quantities in the model. Finally, we will design a simulation model and show the results of simulation and a sensitivity analysis for our model.

바이오 고형연료 이용 열병합발전기술 및 사업성 분석

이강우 한국열환경공학회 2015 한국열환경공학회 학술대회지 Vol.2015 No.추계

5 - Fluorouracil 연고도포후 (軟膏塗布後) 생긴 서혜부 괴양

이강우,김정원 대한피부과학회 1978 大韓皮膚科學會誌 Vol.16 No.4

Topical fluorouracil therapy is an advanced treatment for actinic keratoses, Bowen's disease, multiple basal cell epithelioma and other precancerous skin lesions. Because of extensive and frequent use of 5-fluorouracil(5 F-U) cream, some untoward effects, mostly allergic contact dermatitis and irritation dermatitis, can be anticipated. We have experienced a case of crural ulcer after accidental application of 5 F-U cream for treating the tinea cruris at drug store. The patient was 21 year oid man who had suffered from erythema, erosion and shallow ulceration with oozing, serosanguinous discharge, buming and stinging sensation on the both groins and its adjacent area of the scrotum. The skin lesion was not well responded to topical corticosteroid but controlled by wet dressing and zinc oxide lotion within 10 days of hospitalization. At the 20th hospital day, the skin was healed with remained follicular hyperpigmentation. A few days later, the tinea cruris was confirmed by direct microsopic examination and culture. Generally, topical 5 F-U spares normal cell, while selectively destroying the more rapidly proliferating celI, but there are some possible factors to induce destruction of non-proliferating cell in the highly penetrating area The skin penetration can be different depending upon the anatomical location.

두 개의 우선순위 큐를 적용한 IEEE 802.15.4 GTS 서비스 지연에 대한 분석적 모델

이강우,신연순,안종석,Lee, Kang-Woo,Shin, Youn-Soon,Ahn, Jong-Suk 한국정보처리학회 2008 정보처리학회논문지 C : 정보통신,정보보안 Vol.15 No.5

IEEE 802.15.4에서는 실시간 전송을 위해 GTS 요청 패킷을 조정자에게 전송하여 전송 시간을 미리 예약한다. 본 논문에서는 GTS 예약 지연 시간을 감소하기 위해 802.11e와 같이 일반 데이터와 GTS 요청 패킷의 전송 우위를 차별화하기 위해 두 개의 전송 큐를 사용하는 GTS-FAT 방안을 소개한다. 즉 기존 방식은 이 두 종류의 패킷을 하나의 경쟁 윈도우에 의해 전송하였으나, GTS-FAT 방안은 두 종류의 패킷을 서로 다른 큐에 저장하고 서로 다른 경쟁 윈도우에 의해 전송한다. 또한 본 논문에서는 GTS-FAT의 서비스 지연시간을 분석하기 위해 기존의 802.15.4의 모델과 802.11e의 성능 모델을 결합한 수학적 모델을 제안한다. 제안된 모델의 수치 분석에 의하면 GTS-FAT 방안은 일반 데이터가 GTS 요청 패킷보다 4배 정도 많은 경우에 데이터 전송지연은 6.1%정도 증가하였으나 예약 요청 지연시간을 최대 50%까지 줄였다. IEEE 802.15.4 reserves transmission time to support real-time transport by sending GTS request packets to the PAN coordinator in advance. This paper introduces GTS-FAT technique to reduce the reservation time by giving a higher sending priority to GTS request packets than data packets. Differently from the conventional scheme where these two kinds of packets share a single transmission queue, GTS-FAT scheme allocates two queues with two different contention window sizes like IEEE 802.11e. This paper also proposes an analytical GTS delay model by combining the two legacy models for 802.15.4 and 802.11e to accurately predict the GTS-FAT delay over a given network topology. Our analysis shows that GTS-FAT reduces GTS service delay by up to 50% at the expense of the data delay by only up to 6.1% when GTS request packets four times outnumber data packets.