여름철 교회학교행사의 새로운 시도

이원휘 기독교대한성결교회 활천사 1990 활천 Vol.444 No.-

유해어 필터링과 SVM을 이용한 유해 문서 분류 시스템

이원휘,정성종,안동언,Lee, Won-Hee,Chung, Sung-Jong,An, Dong-Un 한국정보처리학회 2009 정보처리학회논문지B Vol.16 No.1

오늘날 웹이 일반화되면서 사람들은 원하는 정보를 웹을 통해 얻고, 또한 제공하고 있다. 웹이 다양한 정보의 제공과 습득의 장이라는 편의성을 제공하고 있지만, 반면에 너무 많은 정보, 무분별한 유해 정보의 범람 등 여러 가지 문제를 내포하고 있다. 현재 유해 웹 문서를 분류하기 위한 다양한 방법이 연구되고 사용되고 있다. 그러나 각각의 방법들이 갖는 단점들로 인해 획기적인 성과를 내지 못하고 있다. 본 논문에서는 유해 정보로부터 사회적으로 보호를 받아야 할 사용자들을 보호하기 위한 수단으로 유해 웹 문서 차단 방법에 대해 제안하고자 한다. 본 논문에서는 키워드 필터링과 SVM 알고리즘을 이용한 2단계 분류 과정을 통해 분류의 정확률을 높이고자 하였다. As World Wide Web is more popularized nowadays, the environment is flooded with the information through the web pages. However, despite such convenience of web, it is also creating many problems due to uncontrolled flood of information. The pornographic, violent and other harmful information freely available to the youth, who must be protected by the society, or other users who lack the power of judgment or self-control is creating serious social problems. To resolve those harmful words, various methods proposed and studied. This paper proposes and implements the protecting system that it protects internet youth user from harmful contents. To classify effective harmful/harmless contents, this system uses two step classification systems that is harmful word filtering and SVM learning based filtering. We achieved result that the average precision of 92.1%.

Effect of Various Leg-Crossing Positions on Muscle Activities of Rectus Femoris, Tensor Fascia Latae, and Hamstring in Healthy 20’s Adults

이원휘,강태희,김정하,뜨리 대한물리치료학회 2015 대한물리치료학회지 Vol.27 No.5

Purpose: The purpose of this study was to investigate the effect of leg-crossing positions on muscle activities of rectus femoris, tensor fascia latae, and hamstring in healthy 20’s adults. Methods: Twenty healthy subjects were asked to perform three leg-crossing positions, leg crossing (LC), tailor crossing (TC), and ankle crossing (AC). Surface electromyography (EMG) was used to evaluate the activities of rectus femoris, tensor fascia latae, and hamstring during upright sit posture (UP) and three leg-crossing positions and UP was compared to three leg-crossing positions. Repeated one way ANOVA was used for data analysis. The alpha level was set at 0.05. Results: The results showed significant difference in the muscle activities of rectus femoris, tensor fascia latae, and hamstring among leg-crossing positions. The muscle activity of the rectus femoris was significantly lower in LC and TC positions than UP. The muscle activity of tensor fascia latae was significantly higher in LC position than UP and other leg-crossing positions. The muscle activity of hamstring was significantly higher in LC and TC positions and significantly lower in AC position than in UP. Conclusion: Our study suggests that the activity of hip muscles was affected by pelvic and knee alignment in various leg-crossing positions.

Selection of Cluster Hierarchy Depth in Hierarchical Clustering using K-Means Algorithm

이원휘,이신원,정성종,안동언,Lee, Won-Hee,Lee, Shin-Won,Chung, Sung-Jong,An, Dong-Un The Institute of Electronics and Information Engin 2008 電子工學會論文誌-CI (Computer and Information) Vol.45 No.2

정보통신의 기술이 발달하면서 정보의 양이 많아지고 사용자의 질의에 대한 검색 결과 리스트도 많이 추출되므로 빠르고 고품질의 문서 클러스터링 알고리즘이 중요한 역할을 하고 있다. 많은 논문들이 계층적 클러스터링 방법을 이용하여 좋은 성능을 보이지만 시간이 많이 소요된다. 반면 K-means 알고리즘은 시간 복잡도를 줄일 수 있는 방법이다. 본 논문에서는 계층적 클러스터링 시스템인 콘도르(Condor) 시스템에서 K-Means 알고리즘을 이용하여 효율적으로 정보 검색을 하고 검색결과를 계층적으로 볼 수 있도록 구현하였다. 이 시스템은 K-Means Algorithm을 이용하였으며 클러스터 계층 깊이와 초기값을 조절하여 더 나은 성능을 보임을 알 수 있다. Many papers have shown that the hierarchical clustering method takes good-performance, but is limited because of its quadratic time complexity. In contrast, with a large number of variables, K-means reduces a time complexity. Think of the factor of simplify, high-quality and high-efficiency, we combine the two approaches providing a new system named CONDOR system with hierarchical structure based on document clustering using K-means algorithm. Evaluated the performance on different hierarchy depth and initial uncertain centroid number based on variational relative document amount correspond to given queries. Comparing with regular method that the initial centroids have been established in advance, our method performance has been improved a lot.

Reliability and Validity of Measurement of Infrasternal Angle by Radiographic Methods

이원휘 KEMA학회 2018 근골격계과학기술학회 Vol.2 No.2

ABSTRACT Background The infrasternal angle is typically measured using goniometric or photographic methods. Because chest anterior–posterior radiographic images cannot be used to identify the xiphoid process, no study has evaluated the validity of infrasternal angle measurement. Purpose The purpose of this study was to determine reliability and validity of measurement of infrasternal angle by radiographic method. Study design Intra- and inter-tester repeated measures. Methods Infrasternal angles were measured in 25 healthy students using goniometric and radiographic method. To check the xiphoid process in radiographs, the examiner set the marker at the xiphoid process. Radiographs were taken by one X-ray technician for each subject using a radiographic apparatus. Repeated radiographs measurements were made in two test sessions conducted on different days by two testers to assess inter-rater and intra-rater reliability. The reliability of the infrasternal angle measurement was using intraclass correlation coefficients (ICCs: 3,1). The correlation between measurements taken by the radiograph and goniometric methods was calculated to test the validity of the radiographic method. The alpha level was set at 0.05. Results The intra- and inter-rater reliability of infrastenral angle measurements taken by the radiographic method were excellent (ICC=0.991 and 0.993, respectively). Radiographic measurement of the infrasternal angle was highly correlated with goniometric measurement (r= 0.85). Conclusions We suggest that the radiographic method is a highly reliable and valid tool for infrasternal angle measurement. ABSTRACT Background The infrasternal angle is typically measured using goniometric or photographic methods. Because chest anterior–posterior radiographic images cannot be used to identify the xiphoid process, no study has evaluated the validity of infrasternal angle measurement. Purpose The purpose of this study was to determine reliability and validity of measurement of infrasternal angle by radiographic method. Study design Intra- and inter-tester repeated measures. Methods Infrasternal angles were measured in 25 healthy students using goniometric and radiographic method. To check the xiphoid process in radiographs, the examiner set the marker at the xiphoid process. Radiographs were taken by one X-ray technician for each subject using a radiographic apparatus. Repeated radiographs measurements were made in two test sessions conducted on different days by two testers to assess inter-rater and intra-rater reliability. The reliability of the infrasternal angle measurement was using intraclass correlation coefficients (ICCs: 3,1). The correlation between measurements taken by the radiograph and goniometric methods was calculated to test the validity of the radiographic method. The alpha level was set at 0.05. Results The intra- and inter-rater reliability of infrastenral angle measurements taken by the radiographic method were excellent (ICC=0.991 and 0.993, respectively). Radiographic measurement of the infrasternal angle was highly correlated with goniometric measurement (r= 0.85). Conclusions We suggest that the radiographic method is a highly reliable and valid tool for infrasternal angle measurement.

Effects of Exercise Using a Stick on Muscle Activity of Gluteus Maximus and Erector Spinae during Backward Return from Forward Bending

이원휘 KEMA학회 2019 근골격계과학기술학회 Vol.3 No.2

ABSTRACT Background Chronic lower back pain patients commonly present with impaired lumbar movement patterns, which may result in pain and excessive loads on the lumbar spine. A stick exercise can be effective to correct impaired movement patterns during forward bending in patients with lumbar flexion syndrome. Purpose This study investigated the effect of exercise using a stick on muscle activity of gluteus maximus and erector spinae during backward return from forward bending. Study design Comparative, repeated measures design. Methods A total of 25 male patients with lumbar extension syndrome were recruited to this study. All patients performed backward return from forward bending with and without a stick. Gluteus maximus and erector spinae surface electromyography activities during backward return from forward bending were measured. Results There was a significant difference in gluteus maximus and erector spinae muscle activities, on both sides, with versus without use of the stick. During backward return from forward bending with a stick, the activities of the right and left gluteus maximus increased significantly (p<0.05), and those of the right and left erector spinae decreased significantly (p<0.05), compared to without a stick. Conclusions This study suggests that use of a stick can minimize excessive lumbar extension during backward return from forward bending.

Effects of the Abdominal Hollowing and Abdominal Bracing Maneuvers on the Pelvic Rotation Angle during Leg Movement

이원휘 KEMA학회 2020 근골격계과학기술학회 Vol.4 No.2

Background: Abdominal hollowing (AH) and abdominal bracing (AB) are well-known stabilization maneuvers used in rehabilitation and training programs. However, few studies have examined how these two techniques affected the lumbopelvic stability during leg movements. Purpose: This study aims to compare pelvic rotation angles during leg movements with AH or AB maneuver. Study design: Comparative, repeated-measures design Methods: This study included 20 male healthy participants. After attaching motion sensor, we asked the participants to perform the two leg movements, straight leg raise (SLR), and bent knee fallout, in three conditions, including abdominal resting (AR), AH, and AB maneuvers, and collected and compared the pelvic rotation angles during each condition. Results: The difference between the three conditions for pelvic rotation angles of both leg movements was significant (p<0.05). When performing SLR or bent knee fallout with AB maneuver, the pelvic rotation angle decreased more significantly than that in performing movements with AR or AH maneuver (p<0.05). When performing SLR or bent knee fallout with AH maneuver, the pelvic rotation angle decreased more significantly than that in performing movements with AR maneuver (p<0.05). Conclusions: This study indicated that the AB maneuver is more effective in SLR, and bent knee fallout with lumbopelvic stabilization exercise than the AH maneuver.

건강행동과정접근(HAPA)모델을 이용한 중국 대도시 대학생의 신체활동참여과정 검증

이원휘,황향희 한국스포츠학회 2023 한국스포츠학회지 Vol.21 No.2

This study examined the process of physical activity participation using the HAPA model to provide a basis for proposing measures to promote physical activity among Chinese university students. The study population is physical activity participants among four-year university students in a first-tier city in China. The questionnaire was collected online by China Questionnaire (https://www.wjx.cn). The final analyses were frequency analysis, reliability analysis, confirmatory factor analysis, and structural equation analysis using SPSS 26.0 and AMOS 28.0 programs with a total of 406 copies. The conclusions drawn are as follows. First, Action self -efficacy and outcome expectancy were found to have a positive effect on intention to engage in physical activity, but not risk perception. Action self -efficacy also had a positive effect on maintenance self-efficacy. Next, intention to engage in physical activity and maintenance self-efficacy were found to positively influence physical activity participation plans, and maintenance self-efficacy was found to positively influence recovery self-efficacy. Finally, Recovery self-efficacy and plans to engage in physical activity positively influenced physical activity participation behaviour. Based on these findings, it is recommended that physical activity planning behavioural strategies be developed for Chinese university students who have difficulty initiating and sustaining physical activity. Furthermore, it is expected that the HAPA model can be widely applied to physical activity participation behaviour. 본 연구는 중국 대학생의 신체활동 활성화 방안을 제시하는데 기초자료를 제공할 목적으로 HAPA 모델을 이용하여 신체활동참여과정을 검증하였다. 연구대상은 중국 1선도시 소재 4년제 대학생 중 신체활동 참여자이다. 조사방법은 중국 问卷星(https://www.wjx.cn)에 의뢰하여 온라인으로 수집하였다. 최종분석은 총 406부로 SPSS 26.0과 AMOS 28.0 프로그램을 사용하여 빈도 분석, 신뢰도 분석, 확인적 요인 분석, 구조 방정식 분석이다. 도출된 결론은 다음과 같다. 첫째, 행동자기효능감과 결과기대는 신체활동참여의도에 정(+)적인 영향을 미치는 것으로 나타났으나 위험인지는 영향을 미치지 않았다. 행동자기효능감은 유지자기효능감에도 정(+)적인 영향을 미쳤다. 다음으로 신체활동참여의도와 유지자기효능감은 신체활동참여계획에 정(+)적인 영향을 미치는 것으로 나타났으며, 유지자기효능감은 회복자기효능감에 정(+)적인 영향을 미치는 것으로 나타났다. 마지막으로 회복자기효능감과 신체활동 참여계획은 신체활동참여행동에 정(+)적인 영향을 미치는 것으로 나타났다. 본 연구결과를 바탕으로 신체활동 시작단계와 지속하기 어려운 중국 대학생을 위한 신체활동 계획행동전략 수립을 모색해야 한다. 또한 신체활동참여행동을 위한 HAPA모델의 광범위한 적용을 기대해 본다.

Effects of Same-Sided and Cross-Body Load Carrying on the Activity of the Upper Trapezius and Erector Spinae Muscles

이원휘 KEMA학회 2017 근골격계과학기술학회 Vol.1 No.1

ABSTRACT Background The preference of the bag varies according to age, shoulder bag is mostly used by adults. Shoulder bag can result in an asymmetrical load that has negative impacts on the body. Purpose The purpose of this study was to investigate the effects of same-sided and cross-body carrying on the activity of the upper trapezius and erector spinae muscles in standing position. Study design Controlled laboratory study, with a pretest-posttest design. Methods 20 healthy students were asked to carry the shoulder bag, placing it either on a shoulder on the same side of the body as the bag (same-sided load) or in cross-body fashion in standing position. We used surface electromyography to measure the activities of both upper trapezius and erector spinae muscles. We analyzed the data by using paired t-test and compared muscle activity in two methods. The alpha level was set at 0.05. Results The activity of the right upper trapezius and left erector spinae muscles differed significantly between the two carrying methods (p<0.05), showing significantly less activity under the cross-body condition. The activity of the left trapezius and right erector spinae muscles did not differ significantly between the two carrying methods (p>0.05). Conclusions We suggest that proper carrying method for shoulder bag is needed to help prevent musculoskeletal pain caused by asymmetrical muscle activity.

유해어 필터링과 SVM을 이용한 유해 문서 분류 시스템

이원휘,정성종,안동언 한국정보처리학회 2009 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.16 No.1

As World Wide Web is more popularized nowadays, the environment is flooded with the information through the web pages. However, despite such convenience of web, it is also creating many problems due to uncontrolled flood of information. The pornographic, violent and other harmful information freely available to the youth, who must be protected by the society, or other users who lack the power of judgment or self-control is creating serious social problems. To resolve those harmful words, various methods proposed and studied. This paper proposes and implements the protecting system that it protects internet youth user from harmful contents. To classify effective harmful/harmless contents, this system uses two step classification systems that is harmful word filtering and SVM learning based filtering. We achieved result that the average precision of 92.1%. 오늘날 웹이 일반화되면서 사람들은 원하는 정보를 웹을 통해 얻고, 또한 제공하고 있다. 웹이 다양한 정보의 제공과 습득의 장이라는 편의성을 제공하고 있지만, 반면에 너무 많은 정보, 무분별한 유해 정보의 범람 등 여러 가지 문제를 내포하고 있다. 현재 유해 웹 문서를 분류하기 위한 다양한 방법이 연구되고 사용되고 있다. 그러나 각각의 방법들이 갖는 단점들로 인해 획기적인 성과를 내지 못하고 있다. 본 논문에서는 유해 정보로부터 사회적으로 보호를 받아야 할 사용자들을 보호하기 위한 수단으로 유해 웹 문서 차단 방법에 대해 제안하고자 한다. 본 논문에서는 키워드 필터링과 SVM 알고리즘을 이용한 2단계 분류 과정을 통해 분류의 정확률을 높이고자 하였다.