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안동호 상류 운곡천의 이화학적 수질특성과 식물플랑크톤 군집 특성
이중복,이희무,이건주,박정원,박재충,김동걸,권기석 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1
This investigation is about the characteristics of phytoplankton community and physciochemical water quality of specific 6-point the Woon-kog stream system in upsteam of the Andong Lake. DO value was showed over 8.1㎎/L at each site and COD_Mn, BOD, T-N, T-P tend to increase as they stream down and that the existence and dominance of phytoplankton was low and it was difficult to conclude the definite correlation of water quality and phytoplankton community. Finally, it seemed to be desirable that alternatives for pollutional reduction should be made and performed on the basis of the continuous monitoring of the inflow to preserve the Andong Lake.
가시화 기법을 통한 선박 구조설계 지원 전문가 시스템 개발
이경호,한순흥,이동곤,김은기 한국경영과학회 1993 한국경영과학회 학술대회논문집 Vol.- No.1
본 논문에서는 설계 경험이 적은 설계자가 효율적으로 선급규정을 이용하여 선체설계를 할 수 있도록, 범용 전문가시스템 쉘(Shell)인 NEXPERT를 이용하여, 선체 구조설계를 지원할 수 있는 전문가 시스템을 개발하였다. 먼저, 선급 규정집(LLoyd Rule)과 기존의 rule scantling프로그램으로 부터 지식을 추출하고, 이를 바탕으로 객체지향개념에 의해 지식의 그룹핑과 계층화를 시도하였다. 또한, NEXPERT가 갖고 있는 외부 프로그램과의 접속기능(Callable Interface)을 이용하여 각종 설계에 필요한 프로그램과 실적선 데이타베이스를 접속하였다. 특히, Motif를 이용한 그래픽 사용자 인터페이스(Graphical User Interface : GUI)를 도입하였고, 설계자가 결과에 대해 검토를 할 수 있도록 Knowledge tracing 기능을 부여함으로써, 사용자 지향의 구조부재 치수 결정 지원 전문가 시스템을 개발하였다. 이러한 연구를 통해 범용 전문가 시스템이 선박설계에 이용될 수 있다는 가능성을 보였으며, 그 추구해야 할 방향을 설정하였다. 특히, 어떤 설계결정에 이르는데 관여한 규칙들을 보여주며,객체로 정의된 설계 부재들의 값들을 확인하게 함으로써 설계자가 효율적인 설계를 수행할 수 있게 되었다.
Chinese Tourist’s Goals, Expectation and Confirmation in Korea: Importance-Performances Analysis
Lee,Un-Kon,Shi,Yanchao,Dong,Ximei 한국상품학회 2019 商品學硏究 Vol.37 No.2
Many Chinese tourists visit in Korea, but somebody complains that his expectation has not be fulfilled in Korea. We performed the importance-performance analysis to find the gaps between Chinese tourists expectation and confirmation in the various tourism goals. Results indicate that all values of expectations and performances are higher than the median value of 4 in each tourism goal and such tourism goals as Safety and K-wave are elected as the critical area which needs promotion to attract the more Chinese tourists in Korea. This paper could contribute to provide the basic information to make the tourism promotion strategy for Korean tourism agencies.
Web 의 幾何學的 構造特性이 不織布의 機械的 性質에 미치는 영향
李在浩,安東汶,楊澈坤 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.2
The anisotropy of nonwoven fabrics of various types has been studied in terms of modulus, Poisson's ratio, stress-strain, fibre curl, and fibre orientation. Tables and diagrams for these quantities are given. Another important factor is the degree of curl in the fibres, and results are compared from different .types of fabric and different directions. The variations in mechanical properties with direction are explained in terms of the structual features.
강동원,조재오,이현철,하홍곤,고태언 동의대학교 산업기술개발연구소 2000 産業技術硏究誌 Vol.14 No.-
Many control techniques have been proposed in order to improve the control performance of discrete-time domain control system. In the position control system using a DC servo motor as a driver, the response-characteristic of system is controlled by the I-PD controller. In the I-PD control system, the transient response characteristic is more increased and settling time gets longer if gains of I-PD controller are unsuitable. In this paper, a expanded I-PD control system is constructed by inserting a pre-compensator at output terminal of I-PD controller. it is implemented by neural network with two hidden layers. From the result of computer simulation in the proposed control algorithm, its usefulness is verified.
김규곤,이동철,이병칠 동의대학교 경제경영전략연구소 2003 經濟經營硏究 Vol.1 No.1
Recently, enterprises were concerned about the relationship marketing for getting a powerful competitiveness, as the managerial environments were changing from mass marketing in the 1970s to recognizing the importance of customer in a turbulent market in the mid-1980s. There appeared CRM(customer relationship management) as an important method for satisfying the customer. Especially, it was important issue for companies the keeping of existing customer for long time in a competitive environment. In this paper, it is used general multivariate analysis methods and data mining analysis methods such as discriminant analysis, logit model, decision tree analysis, and neural networks. Also, it is tried to find the most efficient model of the data mining analysis in insurance CRM. In addition, it is analyzed and verified the most agreeable model of the data mining estimation about the secession of customers in an insurance company. Finally, effective marketing strategies and some tasks on this issue hereafter based on the results were suggested.
식물체로부터 추출한 물질이 상추 종자의 발아 및 생장에 미치는 영향
박건남,이민경,황선주,김학윤,이인중,신동현,김길웅 경북대학교 농업과학기술연구소 1999 慶北大農學誌 Vol.17 No.-
This study was conducted to detect the allelopathic effect of water and ethanol extracts from 4 plant species (Lactuca sativa L., Ambrosia elatior L., Oenothenra odorata Jasp., Ginkgo biloba L.) on germination and growth of lettuce seeds. A little bit higher inhibitory effect was obtained in ethanol extracts rather than water extracts. Allelopathic effects varied in the source of extracts and concentrations of 4 plant species and the highest allelopathic effect appeared in 10% solution, regardless of plant species.
운동장을 이용한 우수의 포집, 수량 및 수질에 관한 연구
왕창근,이영복,이동곤 忠南大學校 環境問題硏究所 2003 環境硏究 Vol.21 No.-
In this study, quantity and quality of rainwater collected by soil and sand as the playground collection materials were investigated and CNURCPM (Chungnam National University Rainwater Collection Prediction Model) was developed to predict amount of collected rainwater. Quantity of collected rainwater in soil and sand (depth 5 cm) collection system was 615 L(63%) and 7,315 L(77%) for study period, respectively. Average turbidity of collected rainwater in soil and sand collection system was 9.70 NTU, 2.05 NTU for study period, respectively. In case of heavy metal, the concentrations of Fe and A1 were higher than the other heavy metals in both soil and the sand. But in this analyzing the Fe and A1 were less than the standard of water quality that was required in drinking water. So the collected water was insignificant because concentration of heavy metal was not serious. List of water quality; pH, TOC, COD_(Mn), NH_(4)-N, NO_(3)-N were lower or a little higher than the standard of water quality and the item of coli-form was higher than the standard of water quality. These result suggest that the water needs the second treatment such as disinfection. To predict amount of collected rainwater, CNURCPM was developed. For sand collection material, predicted amount by CNURCPM and actual collected amount were 7,534 L and 7,315 L, which were very closed.