신경망에 의한 지능형 원격학습 상담 시스템의 구현

홍규완 동의공업대학 1998 論文集 Vol.24 No.1

The existing academic institutions are trying to construct a 'new education paradigm', virtual colleges the using internet and web-based technologies to provide quality education services. Many education administrators, scholars and computer scientists say that this new education paradigm is the most attractive concept to remove the time and space limitation of disadvantages of traditional colleges and produce the consumer-oriented education services. However, remote learning systems have disadvantages such as lack of learning control method and learning motivation compared to traditional class learning. In this paper, I implemented an intelligent counselling system for remote learning using a neural network that is excellent for regional division for supporting disadvantages of the remote learning system.

Petri Nets 모델 개발에 의한 FMS 출력율 분석에 관한 연구

황규완,하정진 한국경영과학회 1994 韓國經營科學會誌 Vol.19 No.3

Petri Nets are a graphical and mathematical modeling and promising tool for describing and studying systems that are characterized as being concurrent, asychronous, dynamic, distributed and parrallel. The purpose of this paper is to analyze FMS Throughout-Rate by development of Petri Nets. So, it applied to FMS composed of 7 machines and 4 different job types. The result of this paper shows the advantage of using Petri Nets.

고속주축 모니터링용 광파이버 변위센서의 파이버 특성에 따른 센서 성능 연구

박찬규,신우철,배완성,홍준희,이동주 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

To make high speed spindle system work properly, sensors with outstanding resolution and dynamic characteristics are essential. An optical fiber displacement sensor is based on simple principles. Electrical signal responds to the optical flux change due to the displacement change between a target and a sensor probe. In this paper, the performance of optical fiber displacement sensor has been investigated according to properties of optical fiber. Firstly, optical loss has been measured before and after polishing optical fiber endface. Secondly, allowance of optical fiber bending has been tested. thirdly sensitivity and linear range of the sensor has been found out according to the shape of cross section of optical fiber.

On-Line Hangul Recognition Using Wavelet Transformation and Fuzzy Theory

홍규완,조한수 동의공업대학 2000 論文集 Vol.26 No.1

본 논문에서는 웨이브렛 변환과 퍼지 데이터를 입력으로 한 신경망을 이용한 필기체 한글 인식 시스템을 제안하고 실험 결과를 보인다. 본 시스템에서는 분별력이 높고 고정도의 특징을 추출하기 위해 웨이브렛 변환을 이용한다. 기본 웨이브렛의 주파수 영역을 변화하여 생성된 다양한 주파수를 갖는 웨이브렛을 사용함으로써 퓨리에 변환이나 매쉬 특징에 비해 강력하고 풍부한 특징을 추출할 수 있어서, 필기체 한글에 포함된 여러 종류의 변형 특징이나 극소로 미세한 부분적 변형에도 쉽게 대응할 수 있다. 웨이브렛 변환을 적용하기 위해 입력된 데이터를 축 방향에 대한 좌표 이동량을 나타내는 연속적인 신호 형태의 데이터로 변화하고 이 신호 데이터에 웨이브렛의 스케일 함수를 변화시킴으로써 각 스케일에서 패턴의 전역적인 특징과 국소적인 특징을 동시에 추출한다. 또한 필기 변형을 흡수하기 위하여 웨이브렛 변환에 의해 추출된 주파수의 강도를 이중 의미를 갖는 멤버쉽 함수를 사용하여 퍼지화하고 인식 네트워크에 연결되어 있는 신경망을 이용하여 인식을 수행한다. 한국과학 기술원의 온라인 한글 데이터를 사용하여 인식한 결과 필기체 4,100문자, 흘림체 2.800 문자에 대해서 각각 96.7% 96.1%의 높은 인식률을 얻어 제안한 시스템의 유효성을 확인했다.

뉴로 컴퓨팅 시스템 시뮬레이션 언어 개발 및 응용환경의 구축

홍규완,김정수,이수동 울산대학교 1995 공학연구논문집 Vol.26 No.1

대부분의 신경망 시뮬레이션 프로그램은 기존의 언어(C,PASCAL,FORTRAN등)로 구현되었다. 기존의 언어들은 신경망구조와 신경망의 동적행위를 제어하는 데 적합한 자료구조와 문장들을 가지고 있지 않기 때문에 시뮬레이션 프로그램을 작성하거나 모델의 변경에 어려움이 많다. 본 논문에서는 신경망 시뮬레이션 프로그램을 작성하는데 적합한 언어를 설계하였다. 특히 제안된 언어는 신경망 구조를 쉽게 표현할 수 있고 신경망의 동작행위를 효율적으로 기술하기 위하여 층마크로 정의 개념을 도입하였다. 언어는 두개의 DIVISION으로 구성되었다. 하나는 망구조를 기술하기 위한 NETWORK STRUCTURE DIVISION이고 다른 하나는 신경망의 행위를 제어하는 PROCEDURE DIVISION이다. Most of neural network simulation programs have been implemented with the conventional computer languages. It is difficult to implement simulation programs and is various to build neural network, because the languages have not data structures and statements suitable for expressing neural network structures and controlling neural behaviors. This paper describes a neural network simulation language, specifically designed for the development and modeling of neural network applications. It has a layer macro definition concept to express the arbitrary network structures and dynamic neural behaviors easily. It consists of the two divisions. First division describes the network structures. Second division controls the network behaviors.

웹기반 정보처리 산업기사 자율학습 시스템의 설계 및 구현

홍규완 동의공업대학 2001 論文集 Vol.27 No.1

In this paper, I proposed the design and the implementation of a web based self learning system for information processing certificate. This system is consist of four modules: User identification module, Professor module, Student module, Learning valuation and Consulting module. The user identification module classifies a user into student, professor, and system manager. The professor module provides the function that professor inserts exercise questions into self learning system. The student module provides the function that a student learns exercise questions and views the result of self learning. This self learning system can increase the efficiency of web based self learning for information processing certificate.

CT performance phantom을 이용한 cone beam형 전산화단층영상의 특성

한충완,김규태,최용석,황의환 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.3

Purpose : To evaluate the characteristics of (widely used) cone beam computed tomography (CBCT) images. Materials and Methods : Images were obtained with CT performance phantoms (The American Association of Physicists in Medicine; AAPM). CT phantom as the destination by using PSR 9000N™ dental CT system (Asahi Roentgen Ind. Co., Ltd., Japan) and i-CAT CBCT (Imaging Science International Inc., USA) that have different kinds of detectors and field of view, and compared these images with the CT number for linear attenuation, contrast resolution, and spatial resolution. Results : CT number of both PSR 9000N™ dental CT system and i-CAT CBCT did not conform to the base value of CT performance phantom. The contrast of i-CAT CBCT is higher than that of PSR 9000N™ dental CT system. Both contrasts were increased according to thickness of cross section. Spatial resolution and shapes of reappearance was possible up to 0.6 mm in PSR 9000N™ dental CT system and up to 1.0 mm in i-CAT CBCT. Low contrast resolution in region of low contrast sensitivity revealed low level at PSR 9000N™ dental CT system and i-CAT CBCT. Conclusion : CBCT images revealed higher spatial resolution, however, contrast resolution in region of low contrast sensitivity was the inferiority of image characteristics.

절삭공정의 성능예측에 관한 연구

황규완,김순경,전언찬 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2

This paper focuses on the aurtomatic selection of optimal cutting condition and cycle time on multispindle metal cutting machine. The several mathematical relationships were formulated for simultaneous selection of machining parameters and tool changing scheme. In this research we two step generative approach ; step 1 is mathematical modeling for the selection of optimal cutting conditions and the other is GMDH-TYPE modeling to find prediction equation of system performance. Thus in this paper, mathematical machining models combined with a heuristic GMDH-TYPE modeling to estimate the system performance. These models are developed computer programs for practical applocation and it was shown that the proposed approach has a good potential and offeers a valuable tools to analyze the metal cutting system.

도시의 재개발과 미술의 비판적 개입에 대한 연구 : 1980년대 이후 한국의 도시개발과 미술운동의 상호관계를 중심으로

최규완,박진완 영상예술학회 2009 영상예술연구 Vol.15 No.-

미술은 오랜 기간 동안 현실과 별개인 것으로 인식되어 왔으나 19세기 중반 사실주의의 등장 이후로 중요한 전환점을 맞이한다. 예술의 표현은 그 시대와 장소의 사회적 상황에서 기인하는 것으로 특히, 사실주의는 외형뿐만 아니라 시대의 내재적 의미까지 살피는 것이다. 한국의 미술계는 민중미술을 시작으로 산업화로 인한 급격한 공간의 변화에 주목하였다. 1960년대 이후의 한국은 근대화의 표상으로서 주거지의 외관을 빠르게 바꾸어나갔다. 이런 장소의 물질주의적 변화는 도시인에게 많은 혜택을 가져다주었으나 그에 대한 부작용도 필연적으로 드러나기 시작하였다. 한 장소에 뿌리내릴 필요가 없어진 인간은 장소와의 기본적인 유대를 상실했으며 반복되는 전면철거방식의 도시개발은 각종 사회문제들을 야기하고 있다. 영세가옥주와 세입자들이 장소를 잃고 점점 외곽으로 내몰리는 상황과 금전적 가치로서의 일회성 주거지 조성 등이 그것이다. 사회비판적 사실주의의 입장에 선 작가들은 이런 일관적으로 지속되는 사회의 문제점을 직시하고 이에 대한 담론을 형성하기 위해 노력하였다. 이들은 변화하는 사회분위기에 맞춰 그 표현방식과 태도를 바꾸어 왔으며 효과적인 표출에 대해 고민하고 있다. 민중미술이 막을 내리고 민주화에 대한 담론이 수그러들면서 미술계는 기존의 정치적 성향을 버리고 사적인 시각에서 주거지에 대한 담론을 꾀한다. 일부 작가들은 진정성이 내재된 향수와 경험에 기초하여 장소를 표현하며 집단을 통해 표출되는 공공미술은 도시에 적극적인 개입으로 사회와 미술의 대안적 관계를 모색한다. 이런 미술계의 노력은 아직 그 사회적 의미를 판단하기에는 시기적인 거리가 짧으나 사회현실에 개입하는 미술의 당위성이 인정되며 역할의 대안적 가능성을 기대할 수 있다. Arts had long been regarded as something separated from reality until the mid 19th century, when realism as an important turning point in art trends came into existence. Artistic expressions are attributable to social conditions in each era and place. In particular, realism is supposed to pay attention to the meanings inherent in a certain age let alone superficial forms. The art field in Korea, the people's art in particular, took notice of remarkable spatial changes resulting from industrialization. Since 1960s, the residential appearance in Korea has been transformed rapidly as a symbol of modernization. Such materialistic spatial changes have brought lots of benefits to dwellers in urban areas. Unfortunately and eventually, side effects have ensued. Humans, who do not have to settle down in one place, have lost fundamental ties with places. Urban development based on repeated overall removal has caused a range of social problems. Examples of such problems include small and petty landlords and tenants who can not help but move to suburban regions losing their places and the one time residential areas built driven by financial values. Artists in favor of social criticism and realism look squarely on and make efforts to discourse upon such consistent and continuous social issues. Further, they change their attitudes and expressions in accordance with varying social atmospheres and are concerned about effective ways of demonstration of their worries. As the discourse on democratization declined following the end of people's art, the world of art gave up the political propensity and turned to another discourse on residential areas from the perspective of privacy. Some artists express places based on nostalgia and experience with immanent truthfulness. Public arts demonstrated through groups are actively involved in urban life, seeking after alternative relations between society and art. Though it may be too early to judge the social meanings of such efforts that made by the field of art, involvement and participation of art in society and reality are justified in that such efforts could lead to possible alternative roles.

유방 절제술 후 조기 운동프로그램의 치료 효과

이규완,이충휘,조상현,박정미 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.1

The purposes of this study were to investigate the therapeutic effects of an early exercise program after mastectomy and to provide the early exercise program protocol for patients who had undergone mastectomy. The subjects were seventy women who were diagnosed with breast cancer. They were randomly assigned either to a experimental group (n=35) that received early postoperative exercise program or to a control group (n=35) that received only education by nurses. Data were obtained for each patient from goniometric measurements of shoulder flexion, abduction, external rotation, 10 elements of functional performance, and subjective pain evaluation using visual analogue scale (VAS). All variables were measured preoperatively, three days postoperatively, and one month postoperatively. Data were compared by groups using independent t-test and Mann-Whitey U test for parametric or non-parametric data, respectively. There were no significant differences between the groups for all variables preoperatively and at three days postoperatively. But there were significant differences at one month postoperatively. The experimental group showed a statisti-cally significant increases in shoulder flexion, abduction, and external rotation and in the pain VAS at one month Postoperatively (p〈,05). Also, at one month prostoperatively, the experimental group had less difficulty with three elements of functional performance-doing up a 'back' zippered article of clothing, reaching the ipsilateral scaula, and contralateral scapula with the fingers on the operated side- than the control group (p〈.05). The results of this study suggest that after mastectomy, the early exercise program conducted by a well-trained physical therapist can make a significant contribution to the return of more normal shoulder function and activities of daily living and to an increased quality of life.