영상데이타베이스 구축을 위한 건축설계도면 인식

이연식,신성윤,김정은 群山大學校基礎科學硏究所 1995 基礎科學硏究 Vol.10 No.-

This paper proposes an approach to the vectorization and representation of large-size architectural drawing images. The class of drawings considered here is characterized by instances of symbols, character strings and connections. After horizontal and vertical projection of the scanned gray-scale image, symbols, character strings and connection lines are separated using a few simple yet effective generic drawing properties. The approach is based on a modified run-length image representation on a modified run-length image representation and line- by-line processing scheme with a limited amount of image line stored in memory. Within this approach fast algorithms for transformation of a large-size gray-scale image in vector form are suggested. A hierarchical data structure for the representation of these images in vector form, which stores in compact form all the needed information about connected components, segments, and feature points, is suggested. The process steps for obtaining this data structure are described. The experimental results are also shown.

객체지향 데어터베이스 시스템에서 능동규칙 설계를 위한 메소드의 매개변수 이용

이연식,배석찬,홍석기 群山大學校 1996 論文集 Vol.23 No.-

The methods, class components of object- oriented database, regard as the chaining events that are able to access the states of object directly and invoke other methods. And, because these methods are composed of codes or procedures, it describe the rules which are used by means of the response of events in active database easily. In this paper, we propose and implement the method that designs the efficient methods of classes using various parameter passing mechanisms in active rule design. This proposed method describes the characteristics and activating region of rules precisely and manages those efficiently. And also, using this method, it can be easily understand the changes of semantics that occur on account of insertion or deletion of rules.

객체 중심의 전문가 데이타베이스 시스템 및 이에 기반을 둔 공정 로보트 CAD 프로그래밍 시스템 설계에 관한 연구

이연식,최동운 群山大學校 自然科學硏究所 1991 自然科學硏究 Vol.6 No.-

공정 로보트 CAD 프로그래밍에서 전문가 시스템의 개발 방법을 활용하고 이러한 로보트 CAD 프로그래밍 시스템을 보다 쉽게 사용자가 활용할 수 있게 하기 위한 적절한 시각적 사용자 인터페이스 시스템이 요구된다. 본 논문에서는 시각적 대화식 인터페이스 시스템과 각종 그래픽 정보, 텍스트 정보, 이미지 정보, 규칙 기반 지식 등을 효과적으로 통합 관리하는 오브젝트 중심 데이타베이스 시스템에 기반을 둔 다매체 정보관리를 위한 시스템을 제안하였다. Process Robort CAD programming is the utilise of development method of Expert System and this system require an appropriate interface that the user easily use. This paper proposed a Visual interactive interface system and design on multimedia information management system based on Object-oriented Database System.

소성법에 의한 Li_(2)Ti_(3)O_(7)의 합성 및 리튬이차전지용 부극 물질로의 응용

송연호,이진식,이철태 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.1

The ramsdellite, Li₂Ti₃O_(7) was prepared by reacting, in air, mixtures of Li₂CO₃ and TiO₂ by calcination at 1050℃, for 12 hrs and was examined a possibility to use as an anode material. Li₂Ti₃O_(7) showed a discharge capacity of 120~140 mAh/g with good cycle ability during the 20 charge/discharge cycles in a Li/1M LiPF6〔in EC-DEC (1:1 by volume)〕Li₂Ti₃O_(7) cell at a current density of 0.15 mA/㎠ and the voltage range 0.5 ~ 3.0V.

능동 규칙 시스템의 구성요소 설계

이연식,김광종 群山大學校 情報通信技術硏究所 1999 情報通信技術硏究論文集 Vol.3 No.-

Conventional database systems are passive, but recent trends in database technology have focused on extending conventional database systems to enhance their functionality and to accommodate novel and more advanced applications. One important enhancement is transforming database systems to be active. Active database system performs certain operations automatically in response to certain events occurring or certain conditions being satisfied. Active rule system is the most important component in an active database system. Mainly, the active rule system have several elements of event detector, condition evaluator, action executor and rule manager, etc. In this paper, we propose the design of components of active rule system which can support the active capabilities and review and evaluate the most prominent research projects in active database systems. And also, we describe the guideline for implementation of rule systems to be supported the various concepts of rules and the efficient rule processing for active database systems.

이 기종 컴퓨터간의 화일전송에 따른 네트워크 써어비스 계층에 관한 연구

이연식 군산대학교 1987 論文集 Vol.14 No.-

본 논문에서는 이 기종 컴퓨터간의 파일 전송을 가능하게 하여 주는 네트워크 소프트웨어인 KERMIT의 프로토콜을 모듈별로 분석하여,시간에 의한 자동적인 파일 전송과 문안 보호를 위한 암호화 시스템을 설계ㆍ구현함으로써,네트워크 써어비스 계층을 강화하였다. In this paper I analysis the KERMIT(network S/W) protocol-which is possible to transfer files among heterogeneous computers-in particularly its modules.And I have strengthened the network service layer by design and implementation of automatic file transfer system and of enciphering system

두가지 두부 방사선 사진 중첩 방법의 비교 : Nasion-Sella line 중첩과 Anterior cranial base 중첩 Nasion-Sella line method and Anterior cranial base method

문윤식,경승현 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.4

성장 또는 치료로 인한 악안면골의 변화는 두부 방사선을 중첩함으로써 판단할 수 있다. 중첩에 대한 평가는 중첩방법에 따라 변화되므로 좀더 정확한 중첩 방법을 선택하는 것은 치료 효과에 대한 분석이나 성장 변화에 대한 평가를 정확히 하는 선결 요건이 될것이다. 3년 정도의 비교적 짧은 성장기간을 가진 11세 전후의 여자환자 19면을 대상으로 가장 널리쓰이는 중첩방법인 Nasion-Sella line중첩과 Bjork가 주장하는 Anteirior cranial base(ACB)중첩을 비교하여 다음과 같은 결론을 얻었다. 1. Nasion-Sella line중첩과 ACB중첩은 중첩오차(registration error)의 크기가 거의 같아서 reliability에 있어서 큰 차이가 없는 것으로 나타났다. 2. 검사자간 차이(interobserver difference)에 있어서 Nasion-Sella line중첩은 7개의 측정 항목 모두에서 두 검사자간 차이가 없었으나 ACB중첩은 7개의 측정 항목중 4개의 측정 항목에서 두 검사자간 유의성 있는 차이가 나타났다. 3. 중첩방법의 차이(intermethod difference)에 있어서 Nasion-Sella line 중첩으로 계측치와 ACB 중첩으로 측정한 계측치가 유의성있게 차이가 나지 않았다. Spatial change of craniofacial structryes from growth or orthopedic force is usually evaluated by cephalometric superimpositions at different points in time. As the evaluation can be changed according to cephalometric superimposition method, selection for correct superimposition method is very important. Double registration of nineteen pairs of female lateral head films, their growth period is average 3.7years amd age is average 10.7 years, were performed by two observers. Comparisions was made between two methods and the results revealed the following; 1. NS line and ACB superimpositions are not markedly different in reliability due to almost same registration error of them. 2. The investigation was undertaken to examine interobserver difference. In ACB method, significant difference was revealed in 4 Measurements of 7 measurements was 3. In the investigation of intermethod difference, there is no significance between NS line and ACB superimpositions.

분산시스템 구성에 관한 연구

이연식,박기홍 群山大學校自然科學硏究所 1987 自然科學硏究 Vol.2 No.-

Recently, distributed system has become the main issue in data processing system. And many researchers has supposed and presented the result of their studies. In this paper, we divided the function of distributed system into three parts-information processing, database processing and network processing. And, we supposed the configurations of each functions by analysis of their structures and characteristics.

現代詩의 方法論的 考察 : with special Reference to Decadence and Depaysement A Methodic現代時의 方法論的考察

具然軾 東亞大學校 1972 東亞論叢 Vol.9 No.-

The artistic spirit, methods, and underlying thoughts are the factors that give differences to "Contemporanelte" and "modern-age" arts. It may be reasonable to argue that the modernism that emerged in the 30's offers us a deviding line between the two periods : Contemporanelte and Modern-age. The writer tried to approch to modern poetry in two ways, that is, through the studies of both Cecadence and Depaysement poems. Decadence is one of the methods adopted by the symbolistic poets in France. In Korea, those poets who wrote poems with the monthly literary magazine, "Paeho" as their core of creative activities followed this method. The 19th century poems written in the line of the Decadence school are briefly explained. The writers of Futurism, Cubism, Dadaism adopted the method of Depaysement. Surrealisme implies the method that has the 20th century poetical characteristics most. The poems written under this method are analyzed and explained. This paper deals with the aspects of the spirits and methods of modern arts. August, 1972

객체지향 데이타베이스 시스템에서 트랜잭션 처리를 위한 동시성 제어기법설계

李淵植,裵錫燦,申定薰 群山大學校基礎科學硏究所 1993 基礎科學硏究 Vol.8 No.-

When some transactions are concurrently executed, the DBMS should be controlled not to induce such a problem that currently executing applications may interfere other transactions. When the generally used conventional locking mechanism in DBMS is applied to composite objects, a class or an instance of a class comes to be treated as a lockable unit. As a results, a number of locks happen to increase and the concurrency level of the system can be deteriorated. In this paper, we proposed the mechanism of locking in Object-Oriented DataBase Systems to enhance their concurrency. According to the proposed locking mechanism, when a transaction tries to access some composite objects, the DBMS checks whether the accessed composite objects and the lock of the transaction are compatible by taking advantage of the relevant components information of the composite objects. If they are compatible, the DBMS locks the target composite objects, and allows the transaction to access and operate on the target composite objects.