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Hybrid Feature Selection Using Genetic Algorithm and Information Theory
조재훈,이대정,박진일,전명근 한국지능시스템학회 2013 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.13 No.1
In pattern classification, feature selection is an important factor in the performance of classifiers. In particular, when classifying a large number of features or variables, the accuracy and computational time of the classifier can be improved by using the relevant feature subset to remove the irrelevant, redundant, or noisy data. The proposed method consists of two parts: a wrapper part with an improved genetic algorithm (GA) using a new reproduction method and a filter part using mutual information. We also considered feature selection methods based on mutual information (MI) to improve computational complexity. Experimental results show that this method can achieve better performance in pattern recognition problems than other conventional solutions.
이종복,이대정,최문기,김은철,Lee, Jong-Bok,Lee, Dae-Jeong,Choi, Moon-Gi,Kim, Eun-Cheol 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.3
Although synovial chondromatosis is most frequently found in the knee, they have been reported in temporomandibular joint. Synovial chondromatosis is a cartilaginous metaplasia of the mesenchymal remnants of the synovial tissue of the joint. It is characterized by the formation of cartilaginous nodules (loose bodies) in the synovium and within the articular space. Pain and swelling are the most common symptoms of the synovial chondromatosis and somtimes deviation of the mandible toward the unafected side during motion may occur. When these lesions becom symptomatic, they should be removed surgically.
범안면 골절과 연관된 간접적 외상성 시신경 병증에 의한 시력상실 증례
이종복,이대정,최문기,민승기,Lee, Jong-Bok,Lee, Dae-Jeong,Choi, Moon-Ki,Min, Seung-Ki 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.1
As panfacial fractures are involved multiple fracture, there are possibility of many pre-operative & postoperative complications. It is necessary to do exact pre-operative evaluation, appropriate operation and care, for preventing and treating these complications, especially related to optic nerve injury. The complication occurs rarely after periorbital facial bone fracture, and indirect injuries may occur as a result of impact shearing force transmitted into the optic nerve axons or to the nutrient vessels of the optic nerve. Also indirect injuries may occur after the force of impact because of vasospasm and swelling of the optic nerve within the confines of the nonexpansile optic canal. It is necessary to active evaluation and treatments involving decompression of the orbit surgically and high dose steroid therapy in relation to panfacial fracture. But sometimes this treatments are limited due to severe swelling of the face and related multiple bone fractures in the body. This case showed the delayed neuropathy, at last visual loss, in spite of megadose methylprednisolone administration. The purpose of this article is to present indirect traumatic optic neuropathy that is one of many complications in panfacial bone fracture.
하악 치성점액종 환자에서 유리장골이식으로 재건된 하악골의 골신장술 후 임플란트식립 : 증례보고
임헌준,김문섭,이대정,이종복,민승기,편준영,Lim, Hun-Jun,Kim, Moon-Seob,Lee, Dae-Jung,Lee, Jong-Bok,Min, Seung-Ki,Paeng, Jun-Young 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.5
Odontogenic myxoma, a rare tumour that occurs in the jaws, locally invasive, destructive tumors that do not metastasize to lymph nodes. Large odontogenic myxoma on mandible is treated by mandibulectomy, defected mandible is reconstructed by bone graft. Reconstructed mandible is difficult to reconstruct dentition using implant because of deficiency of bone amount. So it is necessary to additional bone graft. But a poor aspect of soft tissue lead to unsatisfactory result. Because of distraction osteogenesis is possible to reconstruction of an amount of bone and soft tissue, that is advantage to reconstruction of alveolar bone on reconstructed mandible. We report with review of literatures the 25 years old male patient who had odontogenic myxoma in left mandible, was undergone mandibulectomy and successfully implant installation and prosthetic restoration after distraction osteogenesis(Track $Plus^{(R)}$, KLS Martin, Germany) on the reconstructed mandible with a free iliac bone graft, and we have conservative and successful result.
이순홍,김병량,문명욱,이대정,정영호 안양대학교 산업기술연구소 2004 自然科學硏究 Vol.11 No.1
대구 지하철 참사 이후 사회 전반적으로 방염에 대한 관심이 증대되어 방염제에 대한 연구가 활발하게 진행되고 있는 실정이다. 기존의 할로겐화 방염제는 방염제 자체의 독성으로 인해 인간의 건강과 환경에 유해성이 확인됨에 따라 이를 대체할 친환경 방염제의 연구가 부각되고 있는 시점이다. 본 연구에서는 친환경 대체 방염제의 일환으로 인계와 무기계 방염제를 혼합 사용하여 우수한 방염성능 및 연소시 유독가스가 발생되지 않는 친환경 방염제의 조성을 설계하고자 하였다. 인계 방염제로서 제1인산암모늄, 제2인산암모늄을 사용하였으며, 무기계 방염제로서 붕산과 붕사를 사용하여 각 조성 배합비의 함량 변화 실험을 통한 방염 특성 평가를 수행하였다. 이와 더불어 방염제의 부착률에 따라서 방염효과가 달라지는데, 최적의 조성으로 부착률을 달리하여 경제성과 법적인 측면을 고려하여 가장 효율적인 부착률을 알아보았다. The purpose of this research is to make a non toxic flame retardants as a substitute material for toxic halogen type, and to evaluate burning area, adhesion rate and flammability of non toxic flame retardants. The non toxic flame retardants were prepared by mixing processes of ammonium phosphate monobasic, ammonium phosphate dibasic, boric acid and borax under the various preparation conditions. Flammability of polyester fabrics treated with these mixed flame retardants was investigated through measurement of burning area and adhesion rate. The burning area values were decreased with increase of the Ammonium phosphate monobasic and ammonium phosphate dibasic content of flame retardants. For economic and legal reasons, the optimum adhesion rate of flame retardants on the polyester fabrics was 50%.
한국인에서 3차원 conebeam CT를 이용한 부이공의 해부학적인 평가
금기천,오승환,민승기,이병도,이종복,이대정,팽준영,Keum, Ki-Chun,Oh, Sung-Hwan,Min, Seung-Ki,Lee, Byung-Do,Lee, Jong-Bok,Lee, Dae-Jeong,Paeng, Jun-Young 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.1
Purpose: The mental foramen (MF) is an important anatomical structure during local anesthesia and surgical procedures in terms of achieving effective mental nerve blocks and avoiding injuries to the neurovascular bundles. Thus, understanding the anatomic features of the mandibular canal and accessory mental foramen in Korean could contribute to the surgical anatomic assessment. This study was to elucidate frequency, position and course of AMF (accessory mental foramen) in Korean using 3D cone beam computed tomography. Materials and Methods: The CBCT (Conbeam computed tomography) DICOM data (Alphard, Asahi, Japan) from 540 patients in korean were analyzed. We investigated images of 3D CBCT using Ondemand (CyberMed, Korea) software program on the incidence and anatomical characteristics of accessory foramen. Results: The accessory mental foramina were found in 17 patients. Accessory mental foramina exist predominantly in the apical area of the second premolar and posteroinferior area of the mental foramen. The accessory branches of the mandibular canal showed common characteristics in the course of gently sloping posterosuperior direction in the buccal surface area. The size of most AMF was obviously smaller than that of MF. Conclusion: We could identify frequency, position and course of AMF (accessory mental foramen) by the anatomical study of the accessory mental foramen using 3D cone beam CT in Korean.