표준화 포럼 탐방-홈네트워크 포럼

이상홍,Lee, Sang-Hong 한국정보통신기술협회 2006 TTA저널 Vol.105 No.-

지식정보기술관련 TTA의 표준화 추진체계 및 동향

이상홍,Lee, Sang-Hong 한국과학기술정보연구원 2002 지식정보인프라 Vol.9 No.-

세계가 하나의 시장으로 통합되면서 국제표준을 의무적으로 수용할 것을 요구하는 등 어느때 보다는 기술표준의 역할 및 중요성이 부가되고 있는 현실이다. 따라서 세계 각국 및 기업들은 이에 발맞추어 통신시장을 선점하는 전략적 도구로서 표준화 활동을 보다 강화하기 위해 국제표준화기구 혹은 포럼 등에 보다 전략적으로 표준화활동을 하고 있는 실정이다.

홈네트워크 포럼

이상홍,Lee, Sang-Hong 한국정보통신기술협회 2007 TTA저널 Vol.110 No.-

산촌개발사업 조성이후의 마을시설현황에 따른 주민만족도 평가에 관한 연구

이상홍,신용호,서희숙,Lee Sang-Hong,Shin Yong-Ho,Seo Hee-Sook 한국주거학회 2006 한국주거학회 논문집 Vol.17 No.3

The purpose of this study is to grasp effectiveness of Mountain Village Package Development Work. Mountain Village Package Development Work was started for the welfare and economic activation plan of residents of village from 1995. We want to grasp a practical economic and welfare of residents of village through the village that is enforced Mountain Village Package Development Work after two-three years. The process of this study is as follows. First, we select the village that Mountain Village Package Development Work finished. Second, we grasp the status of Mountain Village Package Development Work through a field study on destination village. Third, we investigate the resident satisfaction.

Multilock 대퇴스템을 이용한 고관절 전치환술

이상홍(Sang Hong Lee),김성진(Seong Jin Kim),변주님(Joo Nam Byun) 대한고관절학회 1999 Hip and Pelvis Vol.11 No.3

We reviewed the clinical records, preoperative and postoperative radiographs of 37 patients(39 hips) who were treated with total hip arthroplasty using the Multilock femoral stem from Jan, 1994 to Jan, 1997 in order to evaluate the clinical and radiographic results. The follow up period ranged from 2 years to 5.5 years(average, 34 months). The age of the patients ranged from 32 to 67 years(average, 49 years). Preoperative diagnoses were avascular necrosis in 30 cases(77%), post-traumatic arthritis in 6 cases(15%) and others in 3 cases(8%). The average Harris hip score improved from 58 point preopera-tively to 93 point postoperatively. The last follow up radiographic findings showed that femoral stabili-ty was considered stable with bony ingrowth in 36 cases(92%) and stable with fibrous ingrowth in 3 cases(8%). The radiolucent line around the femoral stem less than 2mm in width along the radiopaque line was found in 14 cases, and focal osteolysis was found in one. The stress shielding was not found during the follow up period. Postoperative complications were intraoperative fracture in two, polyeth-ylene liner dissociation in two, dislocation in one and heterotopic ossification in one case. This study showed good clinical and radiographic results of total hip arthroplasty using the Multilock hip prosthesis after the average follow up of 34 months, but a long term follow up is need-ed for clinical and radiographic evaluation.

아시안형 감마정을 이용한 대퇴 전자간 골절의 치료

이상홍(Sang-Hong Lee),하상호(Sang-Ho Ha),박성준(Sung-Joon Park) 대한정형외과학회 1999 대한정형외과학회지 Vol.34 No.5

운동 형상 분류를 위한 웨이블릿 기반 최소의 특징 선택

이상홍(Sang-Hong Lee),신동근(Dong-Kun Shin),임준식(Joon S. Lim) 한국콘텐츠학회 2010 한국콘텐츠학회논문지 Vol.10 No.6

본 논문은 가중 퍼지소속함수 기반 신경망(neural network with weighted fuzzy membership functions, NEWFM)과 웨이블릿 기반의 특징 추출기법을 사용하여 왼쪽 또는 오른쪽의 운동 형상을 분류하는 방안을 제안하고 있다. 초기 특징을 추출하기 위해서 첫 번째 단계에서 웨이블릿 변환(wavelet transforms)을 이용하여 뇌파(electroencephalogram, EEG) 신호로부터 웨이블릿 계수들을 추출하였다. 두 번째 단계에서는 첫 번째 단계에서 추출한 웨이블릿 계수들을 통계적인 방법인 주파수 분포와 주파수변동량을 이용하여 60개의 초기 특징을 추출하였다. 이들 60개의 초기 특징은 NEWFM에서 제공하는 비중복면적 분산 측정법에 의해 중요도가 가장 낮은 특징을 하나씩 제거되면서 정확도가 가장 높은 6개의 최소 특징을 선택되었다. 이들 6개의 최소 특징을 NEWFM의 입력으로 사용하여 86.43%의 정확도를 구하였다. This paper presents a methodology for classifying left and right motor imagery using a neural network with weighted fuzzy membership functions (NEWFM) and wavelet-based feature extraction. Wavelet coefficients are extracted from electroencephalogram(EEG) signal by wavelet transforms in the first step. In the second step, sixty numbers of initial features are extracted from wavelet coefficients by the frequency distribution and the amount of variability in frequency distribution. The distributed non-overlap area measurement method selects the minimized number of features by removing the worst input features one by one, and then minimized six numbers of features are selected with the highest performance result. The proposed methodology shows that accuracy rate is 86.43% with six numbers of features.

대퇴경부 골절의 수술적 치료

이상홍 ( Sang Hong Lee ),김정호 ( Jeong Ho Kim ) 대한고관절학회 2007 Hip and Pelvis Vol.19 No.3

걸음걸이 분석 기반의 파킨슨병 분류를 위한 특징 추출

이상홍 ( Sang-hong Lee ),임준식 ( Joon S. Lim ),신동근 ( Dong-kun Shin ) 한국인터넷정보학회 2010 인터넷정보학회논문지 Vol.11 No.6

본 논문은 걸음걸이 분석 기반의 특징 추출과 NEWFM(Neural Network with Weighted Fuzzy Membership Functions)을 이용하여 건강한 사람의 족압(foot pressure)과 파킨슨병 환자의 족압으로부터 건강한 사람과 파킨슨병 환자를 분류하는 방안을 제시하고 있다. NEWFM에서 사용할 입력을 추출하기 위해서 첫 번째 단계에서는 PhysioBank에서 제공하는 족압 데이터와 시간에 따른 족압의 변화를 이용하여 각각 4개의 특징을 추출하였다. 두 번째 단계에서는 웨이블릿 변환(wavelet transform, WT)을 이용하여 이전 단계에서 추출한 8개의 특징으로부터 웨이블릿 계수를 추출하였다. 마지막 단계에서는 추출된 웨이블릿 계수들을 이용하여 통계적 기법인 주파수 분포와 주파수 변동량을 이용하여 40개의 입력을 추출하였다. NEWFM은 족압 데이터로부터 8개의 특징을 추출하여 건강한 사람과 파킨슨병 환자를 분류하였을 때 왼쪽 족압과 오른쪽 족압의 차를 이용한 특징과 시간에 따른 족압의 변화에 대한 차를 이용한 특징의 경우에 높은 정확도(accuracy)가 나타났다. 이러한 결과를 통하여 걸음걸이에 있어서 질질 끄는 특징을 보이는 파킨슨병 환자의 양쪽 족압의 차가 건강한 사람의 양쪽 족압의 차보다는 상대적으로 적다는 특징을 본 실험을 통해 확인할 수 있었다. This paper presents a measure to classify healthy persons and Parkinson disease patients from the foot pressure of healthy persons and that of Parkinson disease patients using gait analysis based characteristics extraction and Neural Network with Weighted Fuzzy Membership Functions (NEWFM). To extract the inputs to be used in NEWFM, in the first step, the foot pressure data provided by the PhysioBank and changes in foot pressure over time were used to extract four characteristics respectively. In the second step, wavelet coefficients were extracted from the eight characteristics extracted from the previous stage using the wavelet transform (WT). In the final step, 40 inputs were extracted from the extracted wavelet coefficients using statistical methods including the frequency distribution of signals and the amount of variability in the frequency distribution. NEWFM showed high accuracy in the case of the characteristics obtained using differences between the left foot pressure and the right food pressure and in the case of the characteristics obtained using differences in changes in foot pressure over time when healthy persons and Parkinson disease patients were classified by extracting eight characteristics from foot pressure data. Based on these results, the fact that differences between the left and right foot pressures of Parkinson disease patients who show a characteristic of dragging their feet in gaits were relatively smaller than those of healthy persons could be identified through this experiment.

해부학적 대퇴스템을 이용한 인공 고관절 무시멘트 전 치환술

이상홍 ( Sang Hong Lee ),최선진 ( Sun Jin Choi ) 대한고관절학회 1998 Hip and Pelvis Vol.10 No.2

We reviewed 56 total hip arthroplasties who have been operated non-cemented total hip replacement arthroplasty using anatomic hip prosthesis(Zimmer, Warsaw, Indiana) and followed for the period of more than 4 years(average 62months) at the Chosun University Hospital, Dept. of Orthopaedic Surgery from Jan, 1991 to the Jan, 1994. The average Harris hip score was improved from 43 pre-operatively to 92 post-operatively. According to the last follow-up radiographic findings, 43 cases(77%) were considered to be stable bony fixation and 4 cases(7%) to be unstable fixation. 4 cases showed loosening of femoral component and we performed revision in one case. Postoperative complications were intra-operative fracture(5 cases), heterotropic ossification(3 cases), polyethylene dissociation(2 cases), dislocation(2 cases) and chronic infection(1 case). Conclusively, to achieve the successful result of total hip arthroplasty using anatomic hip prosthesis, we should consider individual anatomic femoral shape, age and bone density. Especially in old patient, we should consider anatomic femoral deformity according to aging process to prevent the of intra-operative femoral fracture.