• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1998년도 추계학술대회
• /
• pp.197-198
• /
• 1998

We tested the capability of Pointwise Correlation Dimension(PD2), Approximate Entropy (ApEn) and LZ complexity, as alternative measures of a biological signal. For this purpose, we analyzed standard data and a healthy child's 24-hour heart rate variability. Our conclusion is as follows. First, PD2, ApEn and LZ complexity can be used for discerning chaotic attractor, white noise, and periodic signal. Second, these measures show different characteristics on day and night. Third, these measures can be used for detecting time-varying characteristics of biological signals.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2015년도 추계학술발표대회
• /
• pp.1322-1323
• /
• 2015

최근에는 다양한 형태의 성폭력을 발생하면서 이를 방지하기 위한 교육이 따라가지 못하고 있는 실정이다. 모바일 기기의 보급이 활성화되면서 모바일 기기 기반의 교육 프로그램이 만들어지기 시작하고 있으며 성폭력 방지를 위한 어플리케이션이 하나의 좋은 교육 프로그램 형태가 될 수 있다. 이 논문에서는 성폭력 예방 교육을 위한 시스템 제작 사례를 소개한다. 제안한 시스템은 플래시 기반으로 제작되었으며 클라이언트는 개인용 컴퓨터 및 각종 모바일 장치에서 수행된다.

• 실천공학교육논문지
• /
• 제6권2호
• /
• pp.135-139
• /
• 2014

발표자료를 표시하는 프로그램 제어용 도구인 프레젠테이션 리모트 컨트롤러(presentation remote controller)를 발전시켜 단순한 페이지별 이동기능 외에 발표자의 긴장도를 실시간으로 확인하고 인체 반응 상태를 점검하며, 발표능력과 전달의도가 정확하지 못한 부분을 미리 확인하고 보완할 수 있는 지능 부가형 제어기 구성을 제안하고 성능을 시험한다. 제어기로는 스마트 폰이 사용되며 블루투스(bluetooth) 모듈을 인터페이스로 하여, 실행되는 프로세서에 접속하고 맥박 신호를 발표자 신체신호로 검출하여 실시간(150 ms 이내)으로 인체 상태를 인식하고 기록한다. 저장된 인체신호 데이터는 가공/처리되어 발표 능력과 자신감 향상의 자료로 이용한다. 이러한 일련의 과정은 4년제 대학의 졸업예정자를 대상으로 20주의 비정규적인 캡스톤디자인 활동을 통해 이루어진 결과이다.

• 대한인간공학회지
• /
• 제31권5호
• /
• pp.695-704
• /
• 2012

Objective: The purpose of this study was to investigate major factors influencing adoption of smartphone to promote its use by older adults. Background: Despite increasing proportion of elderly people and elderly market, the proportion of elderly smartphone user is still relatively small compared to whole smartphone users. Thus, we need to find out major factors influencing adoption of smartphone to increase proportion of elderly smartphone users. Method: Seven major factors were extracted from 36 survey questions using factor analysis. Regression analysis was also applied to determine specific factors affecting intention of use based on user versus non-user of smartphone, age, gender, and educational background. Results: As results of factor analysis and regression analysis, major factors influencing adoption of smartphone for elderly users were significantly different according to gender, age, educational background based on smartphone users or non-users. Conclusion: The result of this study identified major factors influencing adoption of smartphone for the elderly and provided basic information related to adoption of smartphone according to elderly people's characteristics. Consequently, we can expect to reduce the information gap and to improve quality of life for the elderly. Application: The development and marketing strategy could be applied differently based on the factors influencing adoption of smartphone. It is also possible to develop a prediction model for smartphone adoption according to elderly users' characteristics.

• 공학교육연구
• /
• 제25권5호
• /
• pp.44-54
• /
• 2022

The purpose of this study is to effectively implement the artificial intelligence education required in the digital transformation era. As we enter the era of the 4th industrial revolution, the demand for a great digital transformation in industry is essential, and the nurturing of manpower is presented as an indispensable relationship in the industrial field based on it. The integration of various new technologies that have emerged from the era of the 4th industrial revolution has the greatest purpose in realizing artificial intelligence technology. As the importance of digital competency in the top curriculum reorganization has been highlighted, artificial intelligence education is necessary even in the curriculum reorganization in 2022, and there is a demand in the educational field that it should be converted into a mandatory education in middle and high schools. Artificial intelligence education according to the demands of the times is to develop an artificial intelligence curriculum in universities by reestablishing systematic artificial intelligence education in universities, setting educational goals, and presenting the goals of artificial intelligence education by major. The main direction of this study is to present the relationship between artificial intelligence and each major in university education, develop a curriculum based on artificial intelligence for each major, and link artificial intelligence software for AI education customized for each major. We would like to present a process that can measure the learning outcomes of AI education.

• 한국안전학회지
• /
• 제38권4호
• /
• pp.54-59
• /
• 2023

The relationship between near misses and major accidents can be confirmed using the ratios proposed by Heinrich and Bird. Systematic reviews of previous national and international studies did not reveal the assessment process used in near-miss management systems. In this study, a model was developed for assessing near misses and major factors were derived through case application. By reviewing national and international literature, 14 factors were selected for each dimension of the P2T (people, procedure, technology) model. To identify the causal relationship between accidents and these factors, a near-miss assessment model was developed using a Bayesian network. In addition, a sensitivity analysis was conducted to derive the major factors. To verify the validity of the model, near-miss data obtained from the ethylene production process were applied. As a result, "PE2 (education)," "PR1 (procedure)," and "TE1 (equipment and facility not installed)" were derived as the major factors causing near misses in this process. If actual workplace data are applied to the near-miss assessment model developed in this study, results that are unique to the workplace can be confirmed. In addition, scientific safety management is possible only when priority is given through sensitivity analysis.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2022년도 학술발표회
• /
• pp.475-475
• /
• 2022

The aim of this study is to identify the significant pollutant sources from the tributaries that are affecting the water quality of the study site, the Geum River and provide a solution to enhance the water quality. Multivariate statistical analysis modles such as cluster analysis, Principal component analysis (PCA) and positive matrix factorization (PMF) were applied to identify and prioritize the major pollutant sources of the two major tributaries, Gab-cheon and Miho-cheon, of the Geum River. PCA identifies three major pollutant sources for Gab-cheon and Miho-cheon, respectively. For Gab-cheon, wastewater treatment plant (WWTP), urban, and agricultural pollutions are identified as major pollutant sources. For Miho-cheon, agricultural, urban, and forest land are identified as major pollutant sources. On the contrary, PMF identifies three pollutant sources in Gab-cheon, same as PCA result and two pollutant sources in Miho-cheon. Water quality control scenarios are formulated and improvement of water quality in the river locations are simulated and analyzed with the Environmental Fluid Dynamic Code (EFDC) model. Scenario results were evaluated using a water quality index developed by Canadian Council of Ministers of the Environment. PCA and PMF appears to be effective to identify water pollution sources for the Geum river and also its tributaries in detail and thus can be used for the development of water quality improvement alternative of the above water bodies.

• 자원리싸이클링
• /
• 제24권5호
• /
• pp.15-21
• /
• 2015

폐플라스틱은 조성뿐만 아니라 다양한 플라스틱의 종류로 인하여 열분해 및 연소 속도가 달라진다. 본 연구는 폐플라스틱 고체 연료 (Refused Plastic Fuel)의 열분해 및 연소 시 설계요소 도출을 위한 열중량 분석 및 동역학 특성을 규명하였다. 열중량 분석기 (Thermogravimetric analysis)의 결과을 이용하여 동력학 특성 중 가장 일반적인 방법인 Kissinger 방법을 통하여 활성화 에너지를 구하였다. TGA의 실험 조건은 다음과 같이 설정하였다. 질소 가스유량 20 ml/min, 승온 속도 $5{\sim}50^{\circ}C/min$ 및 최대온도는 $800^{\circ}C$로 하였다. 본 연구의 폐플라스틱 열분해 특성 연구를 위하여 적용된 방법은 실제의 반응기에서 반응기의 성능, 설계 및 최적 운전조건을 결정할 때 기초자료로 사용될 수 있을 것으로 사료된다.

• 대한의용생체공학회:의공학회지
• /
• 제26권5호
• /
• pp.337-341
• /
• 2005

Blood pulsation has been reported to have an advantageous effect on extracorporeal blood circulation. However, the study of pulsatile blood flow in renal replacement therapy is very limited. The in-vitro experimental results of pulsatile blood flow on ultrafiltration, when compared with the conventional roller pump, are described in this paper. Methods: Blood flow rate (QB) and transmembrane pressure (TMP) were considered as regulating factors that have an influence on ultrafiltration. Experiments were performed under the condition of equal TMP and OB in both pulsatile and roller pump groups, Several kinds of hollow fiber dialyzers were tested using distilled water containing chemicals as a blood substitute. Mean TMP (mTMP) varied from 10 to 90mmHg while the QB was 200ml/min. Results: Ultrafiltration rate (QUF) was found to be linearly proportional to TMP, whereas QB had little influence on QUF. In addition, QUF was higher in the pulsatile group than the roller pump group at the identical TMP. Conclusion: In the controlled test, QUF increased solely as a consequence of blood pulsation, which implies that the pulse frequency represents an additional and important clinical variable during renal replacement therapy.

• 공학교육연구
• /
• 제15권2호
• /
• pp.58-66
• /
• 2012

This paper deals with the development of mechatronics fusion curriculum in Handong Global University. The execution of the program, which has been more than ten years long, is presented in the paper. The research indicates that changing the double major program from mechanical and metal engineering to mechanical and electronics control engineering resulted in dramatically increased number of students in the program and increased number of employment opportunities for graduating students. Percentage of satisfaction on the double major program was the highest from students enrolled among ten double major programs in the school. Overall grade average was significantly improved in junior year students compared to sophomore year students indicating the students became more engaged in their studies after having been trained in the program for one year. It is believed that multiple hands-on experiments and class projects conducted throughout the course assisted the development of the new curriculum. The study shows that the mechatronics fusion program is promising since it is relevant to the need of current age of industrial field that demands engineers with multidisciplinary capability.