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- 저자 : 장현중(Hyun-Joong Jang) (검색결과 4 건)
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송재철,이근호,장현중,김진수,이상한,Song, Jae-Chul,Lee, Geon-Ho,Jang, Hyun-Joong,Kim, Chin-Soo,Lee, Sang-Han 대한악안면성형재건외과학회 1993 Maxillofacial Plastic Reconstructive Surgery Vol.15 No.4
본 교실에서는 이전에 구순 및 구개성형술을 받은 2명의 상악골 발육부전 환자에서 각각 상하악 동시 이동술과 상악 단독 이동술을 시행하여 다음과 같은 결과를 얻었다. 1. 술후 상악골은 상방으로 이동한 후 다시 하방으로 이동하였으며 후방으로의 재발은 비교적 작았다. 2. 두 증례 모두 술후 하악골의 전방 재발이 많았다. 3. 순악구개열환자의 외과적 교정술에 있어서 술후 안정성을 높일 방법들이 강구되어야 할것으로 사료된다. Two patients with maxillary developmental deficiency who have previously undergone cheiloplasty and palatoplasty were operated on by simultaneous two jaw surgery and maxillary advancement surgery respectively. And the following results were obtained. 1. After the operation, maxilla shifted superiorly, and then inferiorly without noticible posterior relapse. 2. Postoperative mandibular relapse to the anterior direction was evident in both cases. 3. It is highly suggested that definitive measures to enhance postoperative stability in orthognathic surgery on the cleft lip and palate patients be developed.
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기계 학습 알고리즘을 이용한 비전 기반 자율 학습 모바일 로봇
최정민(Jeong-Min Choi),장현중(Hyun-Joong Jang),박원식(Won-Shik Park),박경재(Kyung-Jae Park),원문철(Moon-Cheol Won) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Many mobile robot navigation methods utilize laser scanners, ultrasonic sensors, vision cameras, and so on for detecting obstacles and path following. However, human utilizes only vision (e.g. eye) information for navigation. In this paper, we propose a mobile robot control method based on machine learning algorithms which use only the camera vision. To efficiently define the state of the robot from raw images, our algorithm has the image processing and feature selection steps to choose the feature subset and uses the result of the neural network learned by the supervised learning. The defined state is utilized in the reinforcement learning algorithm to learn the obstacle avoiding and path following strategy from the camera vision image. The algorithm is verified by two experiments which are the line tracking and the obstacle avoidance.
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상악전치부 임플란트 식립 시 상악전치부 치근첨에서 비강저까지 치조골의 수직적 길이 측정
장해만,김진욱,권대근,장현중,김진수,이상한,Jang, Hae-Man,Kim, Jin-Wook,Kwon, Tae-Geon,Jang, Hyun-Joong,Kim, Chin-Soo,Lee, Sang-Han 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.5
Purpose: Length measurement from maxillary anterior teeth root tip to nasal floor is incorrect in panoramic radiography. Comparison of cone beam computed tomography (CBCT) and panoramic radiography should be helpful in determining the vertical length. Methods: Sixty nine patients were taken CBCT and panoramic radiography of the maxillary anterior. First measurement is length of parallel lines from the central incisor and lateral incisor root tip to nasal floor on CBCT. Second measurement is length of perpendicular lines from the central incisor and lateral incisor root tip to nasal floor on CBCT. Third measurement is length from the central incisor and lateral incisor root tip to nasal floor on panoramic radiographys. Results: In the first measurement of the maxillary central incisors, an average of $11.36{\pm}2.49$ mm in males and $10.49{\pm}2.17$ mm in females. In the second measurement of the maxillary central incisors, $10.41{\pm}2.42$ mm in males and $9.18{\pm}2.08$ mm in females. In the third measurement of the maxillary central incisors, $10.71{\pm}2.20$ mm in males and $9.27{\pm}2.10$ mm in females. In the first measurement of the maxillary lateral incisors, an average of $13.40{\pm}2.04$ mm in males and $11.96{\pm}2.20$ mm in females. In the second measurement of the maxillary lateral incisors, $11.25{\pm}1.82$ mm in males and $10.06{\pm}1.68$ mm in females. In the third measurement of the maxillary lateral incisors, $11.47{\pm}2.01$ mm in males and $10.13{\pm}1.70$ mm in females. Conclusion: The vertical length from root tip to nasal floor was longer in male than female (P>0.05). First measurement was longer than third measurement (P<0.05). This is the actual placement of the implant site measured on the vertical length than the length of the panorama means that there are a few more free. The first measurement was longer than 114% over the third measurement.
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김진수,장현중,이상한,홍창수 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.1
The poor survival rates of patients with carcinoma of a tongue, despite of modern therapy, is well recognized. One of the most important prognostic factors is status of the cervical lymph nodes. There have been a long-standing debate about the treatment of cervical lymph nodes in early-stage tongue cancer. There are two major treatment opinion. The one is surgical excision of primary tumor with prophylactic neck dissection, simultaneously, and the other is to delay the cervical therapy until cervical lymph node is palpable. Recently we have experienced the early cervical metastasis in three patients who had been diagnosed as a carcinoma of the tongue. They were T1, T2 lesion and no palpable node was found. But histopathologic examination showed the occult metastasis or delayed cervical metastasis was occured. By the review of literature and clinical experience, we could conclude the prophylactic neck dissection offers a better chance for success than therapeutic neck dissection of palpable lymph nodes, in case of oral tongue cancer.
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