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코에서 선천성 섬유상피폴립이 피부뿔로 발현한 환자 증례보고
권용석(Yongseok Kwon),전동근(Dongkeun Jun),이명철(Myungchul Lee),최현곤(Hyungon Choi),신동혁(Donghyeok Shin),김지남(Jeenam Kim) 대한두경부종양학회 2020 대한두경부 종양학회지 Vol.36 No.2
Cutaneous horn is the clinical entity, which is circumscribed, conical, markedly hyperkeratotic lesion in which the height of the keratotic mass amounts to at least half of its largest diameter. It may be associated with many different pathological lesions. It is a relatively rare and a kind of epidermal tumor that generally appears as a conical projection. Here, we report rare case of congenital cutaneous horn. A 39-month-old female Korean patient presented at our clinic with a mass at the tip of her nose present since birth. Under general anesthesia, cutaneous horn of nasal tip was completely excised without any complications. The operation site was small enough to perform a primary closure, without any nasal deformity. Histopathologically, it was reported as a fibroepithelial polyps. After operation, there is no evidence of recurrence at 16 months of follow-up.
온도 보정 광섬유 OFDR 센서에 의한 그라운드 앵커 인장력 측정
권일범 ( Kwon Il-bum ),권용석 ( Kwon Yongseok ),서대철 ( Seo Dae-cheol ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
A monitoring technique of ground anchor force is now studying by measuring the strains distributed on a bearing plate. These distributed strains are measured by a fiber optic OFDR (Optical Frequency Domain Reflectometer) sensor. A sensing optical fiber was attached on the bearing plate at the two radial locations and tested by a universal test machine. The anchor forces can be calculated from the differences of these two trains.
권일범 ( Kwon Il-bum ),권용석 ( Kwon Yongseok ),서대철 ( Seo Dae-cheol ),김치엽 ( Kim Chi-yeop ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
Distributed optical fiber sensors have been developed to detect the occurrence of structural anomalies such as excessive stresses, cracks, and leaks at arbitrary locations in the facility. In this paper, we demonstrate fiber optic OFDR (Optical Frequency Domian Reflectometry) sensor to measure strain and temperature through the sensing optical fiber. A PVC pipe was prepared to show the strain measurement performance with a sensing optical fiber attached on the pipe. Also, a temperature test was performed with a sensing optical fiber located in a temperature chamber. In the results, this sensor can operate to resolve 14.2 micro strain and 1.62 degree temperature at the condition of 5 cm spatial resolution.
정민경(Minkyoung Jeong),권용석(Yongseok Kwon),전동근(Dongkeun Jun),이명철(Myungchul Lee),김지남(Jeenam Kim),신동혁(Donghyeok Shin),김완섭(Wan-seop Kim),최현곤(Hyungon Choi) 대한두경부종양학회 2021 대한두경부 종양학회지 Vol.37 No.1
Intraosseous hemangioma is a rare, benign vascular tumor of endothelial origin. It accounts for fewer than 1% of all hemangiomas, and very rarely occurs in the face. Intraosseous hemangioma usually presents as an asymptomatic lesion, but symptoms can occur due to the mass effect. The authors describe a case of intraosseous hemangioma of the zygoma with a review of the relevant literature. A 44-year-old man presented with a chief complaint of painless swelling on the left zygomatic region that had been slowly growing for the past year. On physical examination, a hard, non-movable mass in a deep layer was palpated. On computed tomography performed to evaluate its layers and extent, trabeculation was found inside the mass, but the lack of destruction of the surrounding bone suggested that the mass was benign. Complete surgical excision was performed under local anesthesia. After complete excision of the mass, slight erosions remained on the cortical bone of the zygoma, but because it was small enough not to cause a facial deformity such as depression or asymmetry, no additional reconstructive procedure was performed. There were no symptoms or recurrence during a 8-month follow-up period.
강건한 양방향 트랜스포머 사전학습 언어모델 기반 암호화 트래픽 분류
조민호(Minho Cho),권용석(Yongseok Kwon),안세영(Seyoung Ahn),김수형(Soohyeong Kim),조성현(Sunghyun Cho) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
The proliferation of internet service platforms has led to an increase in the volume and diversity of traffic data. Consequently, the need for traffic classification has become more pressing, necessitating new approaches to encrypted traffic classification. In this paper, we propose the Robust BERT for Encrypted Traffic Classification (RB-ET), a transformer-based model designed to overcome the limitations of traditional DPI methods. The RB-ET model enhances efficiency by removing NSP during pre-training and utilizing Half-Chance Label Prediction (HCLP) to enable learning from unlabeled data as well. Experimental results show that RB-ET has successfully improved the accuracy of encrypted traffic classification and reduced training time compared to existing models.
대북전략의 정치경제학적 접근: 우회 전략으로서의 개발협력
윤상원 ( Sangwon Yoon ),권용석 ( Yongseok Kwon ) 한국비교경제학회 2019 비교경제연구 Vol.26 No.2
본 연구는 대북전략과 북한의 정치경제 사이의 관계를 모형을 통해 분석하고 있다. 이 과정에서 우리는 북한 정권과 주민 사이의 주인 - 대리인 문제가 대내적 체제안정의 차원에서 북핵 문제의 주요한 원인임을 탈북, 부패, 통제수준 사이의 상호의존 관계를 통해 보인다. 그리고 이러한 모형을 확장시켜 북핵 문제에 대한 기존의 두 가지 접근방식, 즉 비핵화의 우선 이행을 요구하는 제재 중심의 전략과, 관계적 관여의 우선적 제공에 이어 체제변화를 유도하는 구조적 관여 중심의 전략이 모두 여과의 문제로 인해 실패할 수 있음을 지적한다. 이와 같이 기존의 비핵화 전략의 장단을 분해하여 비교분석함으로써 본 연구가 제시하는 대안적 전략은 비핵화의 대가로 분리적 관여를 제공하는 것이다. 체제변동 요인을 제거한 구조적 관여는 북한이 수용가능하면서도 비핵화를 담보할 수 있다. 동시에 이러한 전략은 북한의 비핵화 의지를 시험하는 리트머스 용지의 역할을 한다. 본 연구는 첨단산업 분야에서의 국영기업 육성과 광물자원에 대한 주변국들의 개발 참여를 분리적 관여의 구체적 사례로 제시한다. This paper analyzes the relationship between the political economic structure and foreign policy of North Korea. By mathematically modelling domestic interactions such as market control, escaping, and corruption of sheriffs, we argue that the fundamental agency problem of personalistic dictatorship can be adduced as the main reason of nuclear development. The traditional foreign strategies of international community, both economic sanction which demands preemptive denuclearization and structural engagement which induces transition to capitalism, can fail because of filtering problem. The separative engagement which we adduce as an alternative strategy intends to take the strengths and make up for the weakness of the traditional strategies. The deviation of North Korea can be effectively prevented by forming an international economic belt, and the possibility of making a big deal increases as the tranformative effect of engagement vanishes. The denuclearization of North Korea can be achieved only by analyzing the incentive structure of regime in depth, not by a haphazard jumble of improvisation.