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Relationship between mandible fractures and third molars
Lee, Yunhae,Kim, Jeenam,Lee, Myungchul,Shin, Donghyeok,Choi, Hyungon Korean Cleft Palate-Craniofacial Association 2019 Archives of Craniofacial Surgery Vol.20 No.6
Background: This study was conducted to determine the relationship between third molar (M3) and mandibular fracture. Methods: Patients with unilateral mandibular angle or condyle fractures between 2008 and 2018 were evaluated retrospectively. Medical records were reviewed regarding the location of fractures, and panoramic radiographs were reviewed to discern the presence and position of ipsilateral mandibular third molars (M3). We measured the bony area of the mandibular angle (area A) and the bony area occupied by the M3 (area B) to calculate the true mandibular angle bony area ratio (area A-B/area A×100). Results: The study consisted of 129 patients, of which 60 (46.5%) had angle fractures and 69 (53.5%) had condyle fractures. The risk of angle fracture was higher in the presence of M3 (odds ratio [OR], 2.2; p< 0.05) and the risk of condyle fracture was lower in the presence of M3 (OR, 0.45; p< 0.05), than in the absence of M3. The risk of angle fracture was higher in the presence of an impacted M3 (OR, 0.3; p< 0.001) and the risk of condyle fracture was lower in the presence of an impacted M3 (OR, 3.32; p< 0.001), than in the presence of a fully erupted M3. True mandibular angle bony area ratio was significantly lower in the angle fractures than in the condyle fractures (p= 0.003). Conclusion: Angle fractures had significantly lower true mandibular angle bony area ratios than condyle fractures. True mandibular angle bony area ratio, a simple and inexpensive method, could be an option to predict the mandibular fracture patterns.
Role of Neurosurgeons in the Treatment of Acute Ischemic Stroke in the Emergency Room
Lee Sang Hyuk,Taek Min Nam,Ji Hwan Jang,Young Zoon Kim,Kyu Hong Kim,Kyeong Hwa Ryu,Do-Hyung Kim,Byung Soo Kwan,Lee Hyungon,Seung Hwan Kim 대한신경외과학회 2023 Journal of Korean neurosurgical society Vol.66 No.1
Objective : With the recent increase in mechanical thrombectomy (MT) for acute ischemic stroke (AIS), the role of neurosurgeons in AIS treatment has become increasingly important. This study aimed to assess the outcomes of patients with AIS treated by neurosurgeons and neurologists in the emergency room (ER) of a tertiary hospital in South Korea. Methods : From January 2020 to June 2021, 536 patients with AIS within 24 hours of symptom onset were admitted to our hospital via the ER. Based on the type of doctors who provided initial care for AIS in the ER, patients were divided into two groups : (a) neurosurgeon group (n=119, 22.2%) and (b) neurologist group (n=417, 77.8%). Results : Intravenous tissue plasminogen activator (tPA) was administered in 82 (15.3%) of 536 patients (n=17 [14.3%] in the neurosurgeon group and n=65 [15.6%] in the neurologist group). The door-to-tPA time was not significantly different between both groups (median, 53 minutes; interquartile range [IQR], 45–58 vs. median, 54 minutes; IQR, 46–74; p=0.372). MT was performed in 69 patients (12.9%) (n=25, 36.2% in the neurosurgeon group and n=44, 63.8% in the neurologist group). The neurosurgeon group achieved a shorter door-to-puncture time than the neurologist group (median, 115 minutes; IQR, 107–151 vs. median, 162 minutes; IQR, 117–189; p=0.049). Good clinical outcomes (3-month modified Rankin Scale 0–2) did not differ significantly between the two groups (96/119 [80.7%] vs. 322/417 [77.2%], p=0.454). Conclusion : The neurosurgeon group showed similar door-to-treatment time and clinical outcomes to the neurologist group in patients with AIS in the ER. This study suggests that neurosurgeons have comparable abilities to care for patients with AIS in the ER.
루트킷 탐지를 위한 리눅스 커널 감시 코드 삽입의 시스템 성능 부하에 관한 연구
문현곤 ( Hyungon Moon ),허인구 ( Ingoo Heo ),이진용 ( Jinyong Lee ),이용제 ( Yongje Lee ),백윤흥 ( Yunheung Paek ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
시스템을 공격하는 악성코드 기술과 그 방어 기술이 발전하면서,최근의 많은 악성코드들이 운영체제를 직접 변조하는 커널 루트킷을 포함하고 있다. 이에 따라 커널 루트킷에 대한 여러 대응책들이 나오고 있으며,최근의 많은 연구들이 루트킷 탐지능력 향상을 위해 운영체제 커널에 코드를 삽입하고 있다. 이 논문에서는 앞으로 루트킷 탐지를 위해 커널에 대한 코드 삽입 기술이 지속적으로 사용될 것으로 보고,이와 같은 코드 삽입이 운영체제 커널이나 전체 시스템의 성능에 어떠한 영향을 주는지를 알아보았다
이지훈 ( Jihoon Lee ),문현곤 ( Hyungon Moon ),이진용 ( Jinyong Lee ),김용주 ( Yongjoo Kim ),백윤흥 ( Yunheung Paek ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.1
스마트폰의 보급과 더불어 개인 정보를 유출하는 악성 프로그램의 위협 또한 증가하고 있다. 악성 프로그램의 위협으로부터 사용자의 데이터를 보호하기 위해 다양한 모바일용 백신이 시 중에 나와있는 상황이다. 하지만 일반 컴퓨팅환경의 경우를 보듯이 소프트웨어만으로는 모든 악성 프로그램의 위협에 대처하는 것은 상당히 어렵다. 이러한 단점을 극복하기 위해서 하드웨 어의 도움을 받는 선행연구들이 있었지만 스마트폰과 같은 SoC 구조에 적용하기에는 무리가 따른다. 따라서 본 논문에서는 임베디드 시스템의 보안성 향상을 위한 IP 를 개발/실험 할 수 있는 SoC 플랫폼을 구현하도록 한다.
CFI 기술의 연구 동향 및 모바일 기기에의 적용 가능성 고찰
이용제 ( Yong-je Lee ),이진용 ( Jinyong Lee ),허인구 ( Ingoo Heo ),문현곤 ( Hyungon Moon ),황동일 ( Dongil Hwang ),백윤흥 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
최근 포스트 PC 시대가 시작되면서 다양한 모바일 기기가 상호 연결되는 트렌드가 나타나고 있다. 하지만 이로 인해 나타나는 보안상의 취약점 문제는 모바일 기기 상에서의 보다 강력한 보안성 요구하게 되었다. 이 논문에서는 보안 취약점에 대처하는 연구 중 Control Flow Integrity (CFI) 연구에 대한 동향을 살펴보고, 이를 모바일 기기에 적용하기 위해서 고려해야 할 점에 대하여 논하겠다.
Reconstructive rhinoplasty with costal cartilage grafting: A case report of relapsing polychondritis
Lee, Yunhae,Choi, Hyungon Korean Cleft Palate-Craniofacial Association 2019 Archives of Craniofacial Surgery Vol.20 No.5
Relapsing polychondritis (RP) is a rare autoimmune disorder of unknown etiology characterized by recurrent episodes of inflammation and the destruction of cartilaginous tissues, primarily involving the ear, nose, and the respiratory tract. Nasal chondritis is present in 24% of patients at the time of diagnosis and develops subsequently in 53% throughout the diseases progress. Progressive destruction of nasal cartilage leads to the characteristic flattening of the nasal bridge, resulting in the saddle nose deformity. In patients with RP, surgical management for saddle nose is carefully decided due to the disease relapsing characteristics. We present a RP patient with a saddle nose deformity who underwent reconstruction rhinoplasty with autologous costal cartilage grafting. At 6-month follow-up, the patient retained good esthetic results and showed neither complication nor relapse of RP.
Subungual Osteochondromas of the Toe: Two Case Reports for Diagnosis and Treatment
Lee Myung Chul,Seo Chan Eol,Kim Wook Youn,Kim Wan Seop,Kim Jeenam,Shin Donghyeok,Choi Hyungon 대한성형외과학회 2023 Archives of Plastic Surgery Vol.50 No.1
Benign cartilaginous tumors, known as chondrogenic tumors, show cartilage components in the microscopic diagnosis. We present two clinical cases with cartilaginous tumors of the toes showing distinctive clinical manifestations. Two juvenile patients visited our outpatient clinic due to tumors with toenail deformities. A 10-year-old girl presented with a palpable mass with a nail deformity on the left third toe. The initial pathology report was soft tissue chondroma until complete resection. Another 15-year-old male patient visited the dermatology department with a toenail deformity and underwent a punch biopsy. The pathology report was fibrosis with myxoid degeneration. Excisional biopsies were performed for both patients. In the operative field, we observed exophytic tumors connected to the distal phalangeal bones. The final pathology reports were subungual osteochondroma on both patients. The specimen exhibited mature bone trabeculae with a focal cartilaginous cap. Benign cartilaginous tumors have a slow, progressive course and do not show significant symptoms. However, tumors in subungual areas are accompanied by toenail deformities and they can cause pain. Their clinical characteristics lead to a delayed diagnosis. Surgeons can be confused between soft tissue and chondrogenic tumors. When they conduct physical examinations, these categories should be considered in the differential diagnosis.