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이승훈(Seung Hun Lee),라채우(Chae Woo La),이필규(Phill Kyu Rhee) 한국정보과학회 1998 정보과학회논문지(B) Vol.25 No.8
본 논문에서는 조명과 얼굴의 크기에 제한받지 않고 복잡한 배경에서 얼굴 영역을 추출하는 알고리즘을 제안한다. 제안된 알고리즘은 3단계로 구성된다. 단계 1에서 히스토그램 균일화(Histogram Equalization)를 적용시켜 이미지를 강화시킨다. 단계 2에서는 입력 이미지에 다양한 셀크기를 갖는 모자이크 이미지를 구한다. 이미지에 대해 5×4개의 셀로 구성된 확장된 quartet 윈도우를 씌운 후 규칙1을 적용한다. 만일 규칙1을 만족 하는 경우 얼굴 후보 영역으로 인정한다. 단계 3은 추출된 얼굴 후보 영역에 대해 8×8개의 셀로 구성된 octet이라는 모자이크 이미지를 만 들고 octet 이미지를 정규화해서 신경망에 입력한다. 제안된 알고리즘은 얼굴 패턴을 학습할 수 있으며 좌우로 기울어진 얼굴에 대해서도 얼굴 영역을 추출할 수 있다. 그리고 다양한 얼굴 패턴의 학습과 검증을 위해 백트로퍼게이션 알고리즘을 도입하였다. Off-line실험은 인하대학교 얼굴 데이터베이스를 이용하여 비교적 좋은 결과를 얻을 수 있었다. In this paper, a face detection algorithm without the constraints like as the size of face and the illumination in the complex background is proposed. The proposed algorithm consists of three steps. At the first step, Histogram equalization is performed to enhance the image shape At the second step, the input image is made to mosaic image with different cell size. Whenever the extended quartet window that consists of 5×4 cells lies on the mosaic image, the Rule 1 is applied to it. If it is satisfied with Rule 1, then the region which consists of 5×4 cells is accepted as a face candidate region. At the third step, a face candidate region is made to the mosaic image which consists of 8×8 cells, octet. The octet is normalized and then is fed into the neural network. The proposed algorithm can learn face patterns and detect a face although it slants to the left or right. To learn various face patterns, the back-propagation is adopted and it verifies the face candidate regions. Off-Line experiments have been performed using the face databases of Inha university. Encouraging results have been achieved from both off-line and on-line experiments.
황병남,이승훈,이정근,이재봉,Hwang, Byung-Nam,Rhee, Seung-Hoon,Lee, Jeong-Keun,Lee, Jai-Bong 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.2
This study was performed to investigate the characteristics of soft tissue profile of the class III malocclusion and to test the yardstick far differential diagnosis between surgical and orthodontic patients. Initial lateral cephalograms of orthodontic group(30 patients) that have acceptable occlusion and profile by orthodontic treatment alone and surgical group(30 patients) that have favorable occlusion and profile by combined surgical-orthodontic treatment were selected in Ajou university hospital. Powell and Burstone II analysis were made on the tracing. Descriptive, comparative, factor, cluster, and discriminant analysis were carried out with computer program. The results were as followings : 1. Patients who received surgery had a more concave profile and a longer lower facial height than patients who received orthodontic treatment alone. 2. Nasolabial angle, ratio of vertical height, and mentolabial sulcus were significantly different at the 5% level. And facial protuberance, upper lip protuberance, mentocervical angle, nasofrontal angle, nasomental angle, mandibular vertical height, angle between cervix and lower face, ratio of mandibular vertical height divided by cervical depth, ratio of vertical height between upper and lower lip, and maxillary protuberance were significantly different at the 1% level. 3. 8 factors were extracted and factor 2, 3, and 8 showed significant differences by factor analysis. 4. Orthodontic group (25) and surgical group (35) were classified by cluster analysis. 5. Discriminant function was D = 0.079Nasomental angle + 0.081Sn-Gn + 3.343Sn-Gn/C-Gn + 1.734Sn-St/St-Me' -26.460, and cutting score was 0, so we can discriminate that orthodontic group has the score above 0, and surgery group below 0. And 91.7% of original grouped cases were correctly classified.
전진 이부성형술을 동반한 하악지 시상분할골절단술에서 경조직 변화와 관련된 연조직 변화에 관한 연구
최은주,이정근,이승훈,황병남,Choi, Eun-Zoo,Lee, Jeong-Keun,Rhee, Seung-Hoon,Hwang, Byung-Nam 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.1
Purpose : The purpose of this study is to setup a standard treatment protocol in surgical correction of skeletal malocclusion with Angle Class III patients. We asessed the soft tissue changes according to skeletal changes of patients who have undergone orthognathic surgery with bilateral split sagittal ramus osteotomy (BSSRO) and advancing genioplasty. Materials & Methods : The soft tissue change of 9 skeletal Class III patients was assessed after BSSRO and advancing genioplasty. The patient group was skeletal Class III who was surgically treated by BSSRO & advancing genioplasty. The average follow up period is 13 months with the range of 6 and 30 months. All patients have undergone preoperative and postoperative orthodontic treatment. The assessment was devided into two groups. One was antero-posterior relationship and the other was vertical relationship of dimensional changes of soft tissue after orthognathic surgery. Results : In antero-posterior dimensional changes after surgery, the percentage of soft tissue change in comparison to hard tissue was 89%. Vertical ratio after surgery, 86% soft tissue changes were assessed.
급성 골수성 백혈병에서 발생한 흉추부 경막외 과립구육종 - 증례보고 -
박우민,장지수,이창훈,곽호신,이승훈,Park, Woo-Min,Jang, Jee-Soo,Rhee, Chang-Hun,Gwak, Ho-Shin,Lee, Seung-Hoon 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.11
Granulocytic sarcomas are solid tumors resulting from the localized proliferation of myelogenous leukions cells. Epidural involvement of granulocytic sarcoma is very rare in acute myelogenous leukemia(AML). We report a patient with a thoracic epidural granulocytic sarcoma whose presentation with acute paraparesis led to the diagnosis of relapsing of alleged AML. Early recognition of the etiology of the paraparesis and treatment with emergency decompressive, laminectomy, radiation therapy and chemotherapy resulted in an excellent neurological and hematological outcome.
척추 전이암 및 골수종 환자를 대상으로 시행한 경피적 척추체 성형술
박우민,장지수,이창훈,곽호신,이승훈,Park, Woo-Min,Jang, Jee-Soo,Rhee, Chang-Hun,Gwak, Ho-Shin,Lee, Seung-Hoon 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.11
Objectives : In spinal metastasis and myeloma, percutaneous vertebroplasty could be an effective treatment method to provide spinal stabilization and to relief pain for early rehabilitation. The authors report twenty-five cases the clinical results of percutaneous vertebroplasty for twenty-five cases of spinal metastasis and myeloma. Materials and Methods : From September 1998 to December 1999, seventy percutaneous vertebroplasties(PVP) were performed for spinal metastases and myeloma in 25 patients, sixteen women and nine men ranging in age from 34 to 74. The primary malignancies were 6 multiple myelomas, and in metastatic tumore from various origin. All patients complained of severe pain and had osteolytic vertebral body destructions without spinal cord compression. To evaluate clinical improvement, suObjective verbal analogue pain score(VAS) and Karnofsky performance scale(KPS) were used. Thin sliced(2mm-thickness) sectional computed tomography(CT) was performed before and after PVP. Plain X-ray film was followed up every 1 month to assess the vertebral column stability. Results : In 25 patients, a total of seventy PVPS were performed successfully : 6 cervical, 33 thoracic and 31 lumbar vertebrae. Most patients had clear improvement of pain after PVP ; mean as score was 8.1 and 2.9 before and after PVP, respectively. Improvement was maintained in most patients. No further collapse of treated vertebrae was observed(mean follow-up, 7 months). Leakage of PMMA was notod in the spinal canal(13 levels), neural foramen (2 levels), adjacent disk(15 levels), paravertebral soft tissue(14 levels) and vein(8 levels). Pulmonary embolism was detected in three patients after the procedure, but was not associated with clinical symptoms. Conclusion : These results indicate that percutaneous vertebroplasty can be valuable treatment method in osteolytic spinal metastasis and myeloma, providing immediate pain relief and spinal stabilization and contributing to early rehabilitation.
Myounghee Chae,Gyu-Seek Rhee,장익순,김광수,Ji-Hae Lee,Seung-Yeul Lee,Minjung Kim,Junyoung Yang,박준수,이승훈 한국분자세포생물학회 2009 Molecules and cells Vol.27 No.5
The amphetamine derivative 3, 4-methylenedioxymetham- phetamine (MDMA) has become a popular recreational drug, and has also been shown to cause serotonergic neurotoxicity. This report shows that MDMA impairs brain development in a whole mouse embryo culture. The results of quantitative real-time PCR analysis showed that autophagy-related protein 5 (Atg5) expression is elevated in mouse embryo and neuroblastoma cells after MDMA treatment. This elevated Atg5 expression inter-feres with the neuronal differentiation of neuroblastoma cells such as SH-SY5Y and PC12 cells. Thus, our results suggest that the use of MDMA during pregnancy may impair neuronal development via an induction of Atg5 expression.
Dentascan?瑛? 이용한 하악구치부의 하악관 위치에 관한 임상적 연구
김준철(Jun-Cheol Kim),이승훈(Seung-Hoon Rhee),이정근(Jeong-Keun Lee) 대한구강악안면외과학회 2002 대한구강악안면외과학회지 Vol.28 No.5
This study was designed to determine the location of the mandibular canal on lower molar areas. Thirty-three patients were examined with multi-planar reformatted CT scan(Dentascan). Three kinds of measurements were performed. The first was the distances between the upper border of the mandibular canal and the root apices of the first and second molars, the second was the distance between the cortical plate of the mandible and mandibular canal, and the last was the location of the mandibular canal in the buccolingual plane. The obtained results are as follows 1. The distance between the root apices of lower molars and the superior border of mandibular canal was largest at the mesial root of the first molar, and shortest at the distal root of the second molar(p<0.05). 2. The longest distance between the outer surface of the buccal cortical plate of the mandible and mandibular canal was measured from the distal root of the second molar, and this distance decrease gradually mesially( p<0.05). 3. The distance between the mandibular base and inferior border of mandibular canal was longest at the distal root of the second molar, and shortest at the mesial root of the first molar(p<0.05). 4. The location of mandibular canal was lingually positioned in relation to the axis of teeth and alveolar ridge in molar areas.