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구강악안면 영역의 재건을 위한 경골 근위부 내측 골이식술의 후향적 분석
백민규,김일규,조현영,장금수,박승훈,박종원,소경모,Baek, Min-Kyu,Kim, Il-Kyu,Cho, Hyun-Young,Chang, Keum-Soo,Park, Seung-Hoon,Park, Jong-Won,So, Kyung-Mo 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.3
Tibial bone grafts provide an adequate volume of cancellous bone with cortical bone, high biologic value of bone, minimal gait disturbance and complications, and no special contraindications, and offer a superior clinical results than any other donor sites. Lateral appoach in tibial bone graft was used to gain large bone volume traditionally, but medial approach provides low morbidity associated with the tibial anatomic structure, simple and safety surgical procedure, and better comfortable to patients recently. We have undertaken clinical and retrospective studies on patients in Dept. of Oral and Maxillofacial Surgery, Inha University Hospital from April 2004 to January 2008. 50 patients have maxillofacial bony defect as resection of bening tumor, cyst enucleation, alveolar bone resorption, sinus pneumatization were received the tibial proximal autogenous particulated cancellous bone grafts. They were analyzed sex, age, diagnosis of recipient site, lesion size, dornor site, cortical bone repositioning, complications and we concluded favorable following results. 1. Medial approach for proximal tibia is safer and technically easier than lateral approach, associated with the proximal tibial anatomic structures, and short operative times. 2. Proximal tibia provides an adequate bone volume with predictability for oral and maxillofacial reconstruction. 3. Patients rarely complain of pain, swelling, discomfort and dysfunction such as gait disturbance. In conclusion, medial approach for proximal tibial graft seems to be a valuable tool for oral and maxillofacial reconstruction.
태양광 연계형 배터리 에너지 저장장치의 최적 용량 산정
백민규(Min-Kyu Baek),박종배(Jong-Bae Park),손성용(Sung-Yong Son),신하상(Ha-Sang Shin),박용기(Yong-Gi Park) 대한전기학회 2018 전기학회논문지 Vol.67 No.1
In September 2016, the government decided to apply a REC 5.0 weighting to solar-battery ESS to increase the supply of renewable energy. In this paper, we calculated the optimal capacity of battery ESS which maximizes the revenue when solar is linked with battery ESS. In the case study, the optimal capacity was calculated by applying the conservative REC price, and we studied sensitivity analysis about battery price and real-time REC price.
김일규,조현영,백민규,장금수,박승훈,박종원,Kim, Il-Kyu,Cho, Hyun-Young,Baek, Min-Kyu,Chang, Keum-Soo,Park, Seung-Hoon,Park, Jon-Won 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.2
Nasolabial cyst is a rare non-odonotogenic, soft-tissue, developmental cyst arising inferior to the nasoalar region of the face. The most common clinical finding of the nasolabial cyst is that of a slowly enlarging asymptomatic swelling typically without radiographic abnormalities. This case report describes a 25-year-old man in which the clinicopathologic findings and an erosive finding on the computed tomographic scan on maxilla were consistent with nasolabial cyst. The histopathologic features, differential diagnosis, treatment and prognosis are discussed. 비순낭은 비루관의 상피 잔사에 의해 발생하는 드문 발육성 낭종으로 상순의 종창과 비익부의 음기를 야기시킨다. 치료 방법으로는 구내접근법에 의한 낭종의 완전 절제술로 재발율은 거의 없다. 25세 남환으로 상악골의 흡수를 야기시킨 좌측부 비순낭종을 외과적 완전 절제술로 치료하고 양호한 결과를 얻어 문헌 고찰과 함께 보고하는 바이다.
김일규(Il-Kyu Kim),백민규(Min-Kyu Baek),장금수(Keum-Soo Chang),박승훈(Seung-Hoon Park),박종원(Jong-Won Park) 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.35 No.3
Synovial chondromatosis is a rare, benign, monoarticular arthropathy that is characterized by the development of highly cellular, metaplastic cartilaginous nodules in the synovial membrane. It commonly affects larger joints such as the knee, elbow, wrist, shoulder, and hip. Synovial chondromatosis of the temporomandibular joint(TMJ) is rare. Moreover, the temporal involvement of synovial chondromatosis without connection with joint is greatly rare. A 44-year-old women had experienced pain of the right TMJ area and limitation of mouth opening. MRI and CT revealed multiple calcified loose bodies and widening in right upper joint space of TMJ and osteolytic lesion in right temporal bone. Treatment consisted of removal of multiple loose bodies, resection of the osteolytic lesion through the preauricular approach. She was diagnosed with primary transitional synovial chondromatosis of TMJ with involvement of temporal bone. In spite of remaining of the loose bodies, pain and mouth opening improved and there have been no recurrence of signs and symptoms for 5 years follow up.
임프란트 나사형태와 치조골 흡수에 따른 응력분산의 3차원 유한요소법적 분석
김일규,손충렬,장금수,조현영,백민규,박승훈,Kim, Il-Kyu,Son, Choong-Yul,Jang, Keum-Soo,Cho, Hyun-Young,Baek, Min-Kyu,Park, Sheung-Hoon 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.1
The objective of this study is to evaluate the stress distribution according to the thread design and the marginal bone loss of a single unit dental implant under the axial and offset-axial loading by three dimensional finite element analysis. The implants used had the diameter of 5mm and 4mm with 13mm in length and prosthesis with a conical type which is 6mm in height and 12mm in diameter. The thread designs were triangular, square and buttress. In the three dimensional finite element model with $15\times15\times20mm$ hexahedron and 2mm cortical thickness, implants were placed with crown to root ratio 7:12, 10:9, 13:6 and 16:3. And additionally the axial force of 100N were applied into 0mm, 2mm and 4mm away from the center of the implants. The results were as follows 1. The maximum von-Mises stress in cortical bone was concentrated to cervical area of implant, and in cancellous bone, apical portion. 2. Comparing the von-Mises stresses in cortical bone of 2mm and 4mm offset loading with central axial loading, it were increased to 3 and 5 times in diameter 4mm implant, and 2 and 4 times, in diameter 5mm implant. 3. The square threads were more effective than the triangular and butress as the longer diameter, the offset loading, and the worse crown to root ratio. 4. The von-Mises stresses were relatively stable until crown to root ratio 13:6, but it was suddenly increased at 16:3. From the results of this study, minimum requirement of crown to root ratio of implant is 2:1, and in the respect of crown to root ratio, diameter and offset loading, square threads are more effective than triangular and buttress threads.
구강악안면 감염 환자에서 흡인법을 이용하여 조사한 세균감염 양상
조현영(Hyun-Young Cho),김일규(Il-Kyu Kim),백민규(Min-Kyu Baek),장금수(Keum-Soo Chang),박승훈(Seung-Hoon Park),박종원(Jong-Won Park),조정현(Jung-Hyun Cho) 대한구강악안면외과학회 2008 대한구강악안면외과학회지 Vol.34 No.5
Most purulent maxillofacial infections are of odontogenic origin. Treatment of infection includes the surgical intervention, such as incision and drainage, and adjunctive treatment. The use of high-dose antibiotics is also indicated. The choice of an antibiotics should be based on the knowledge of the usual causative microbes and the results of antibacterial sensitivity test. We have undertaken clinical studies on 119 patients in Dept. of Oral and Maxillofacial Surgery, Inha University Hospital from January 2000 to December 2007. Many anaerobic microbes are killed quickly when exposed to oxygen. Thus the needle aspiration techniques and the transfer under inert gas were used when culturing. The aim of this study was to obtain informations for the bacteriologic features and the effective antimicrobial therapy against maxillofaical odontogenic infections. The obtained results were as follows: 1. The most frequent causes of infections were odontogenic (88.3%), and in odontogenic cause, pulpal infections were the most common causes(53.8%). 2. The buccal and submandibular spaces (respectively 23.5%) were the most frequent involved fascial spaces, followed by masticator spaces(14.3%). 3. The most common underlying medical problems were diabetes (17.6%), however the relation with prognosis was not discovered. 4. The complications were the expiry, mediastinitis, necrotizing fasciitis, orbital abscess, and osteomyelitis. 5. The most common admission periods were 1-2 weeks, and the most patients were discharged within 3 weeks. However, patients who admitted over 5 weeks were about 10%. 6. A total of 99 bacterial strains (1.1 strains per abscess) was isolated from 93 patients (78.2%). The most common bacterium isolated was Streptococcus viridans (46.2%), followed by β-hemolytic group streptococcus (10.1%). 7. Penicillins (penicillin G 58.3%, oxacillin 80.0%, ampicillin 80.0%) have slightly lower sensitivity. Thus we recommend the antibiotics, such as glycopeptides (teicoplanin 100%, vancomycin 100%) and quinolones (ciprofloxacin 90.0%) which have high susceptibility in cases in which peni cillin therapy failed or severe infections
에너지저장장치 운전 계획을 위한 전력 사용량 패턴 분류 알고리즘
김영일(Young-Il Kim),최성만(Sung-Man Choi),백민규(Min-Kyu Baek),신복덕(Bok-Deok Shin) 한국조명·전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.12
Prediction of electricity usage patterns plays an essential role in managing the usage efficiently. The prediction needs to be done sophisticatedly and accurately in order to operate energy storage system efficiently since the accuracy of prediction has a big effect on the storage operation plan. In recent years, machine learning-based solutions are being developed because regression analyses have limits when electricity usage has irregular patterns. As the accuracy of machine learning-based predictions depends on the quality and quantity of data to be learned, however, preprocessing process that classifies and labels the usage pattern is important. In this study, we suggest a PCL (Pattern Classification Labeling) algorithm to improve the machine learning-based prediction. It analyzes an actual load data to compare the PCL algorithm with K-means algorithm that has been used widely. In the result, PCL algorithm shows less error rate than K-means algorithm does by 12.2%.