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구강내 연조직 결손부 재건시 유리 전완 피판(Radial Forearm Free Flap)의 유용성
김남균,서동준,박세현,김형준,차인호,남웅,Kim, Nam-Kyun,Seo, Dong-Jun,Park, Se-Hyun,Kim, Hyung-Jun,Cha, In-Ho,Nam, Woong 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.4
Purpose: The purpose of this clinical retrospective study was to evaluate our experience of radial forearm free flap for reconstruction of the oral cavity. Material and methods: From 1997 to 2006, 50 radial forearm free flaps were employed for head and neck reconstruction in 50 patients at department of oral and maxillofacial surgery, Yonsei University, Korea. Data were obtained from chart review, and clinical follow-up. Results: Patients' age ranged from 26 to 82 years (mean 53.2). There were 39 men and 11 women. 43 of the 50(86%) patients had squamous cell carcinoma. The total flap survival were 47(94%), complication rate were revealed for 15(30%). Conclusion: In the reconstruction of soft tissue within the oral cavity, several free flaps have been used. Because of its constant anatomy, long pedicle allows a hypothetic vascular anastomosis in the contralateral neck, contourability for various type of oral defects, pliability and can be used simultaneous reconstruction in intraoral and extra oral defects, the radial forearm free flap constitutes one of the best choice of intraoral soft tissue reconstruction.
벗김강도 측정법에 의한 파워 모듈의 솔더접합 특성 평가
김남균,이희흥,방욱,서길수,김은동,Kim, Nam-Kyun,Lee, Hee-Heung,Bahng, Wook,Seo, Kil-Soo,Kim, Eun-Dong 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.12
The strength and characteristics of the soldering interface of the power semiconductor chip in a power module has been firstly surveyed by the peel strength measurement method. A power module is combined with several power chips which generally has 30∼400$\textrm{mm}^2$ chip area to allow several tens or bigger amps in current rating, so that the traditional methods for interface characterization like shear test could not be applied to high power module. In this study power diode modules were fabricated by using lead-tin solder with 10${\times}$10$\textrm{mm}^2$ or 7${\times}$7$\textrm{mm}^2$ soldering interface. The peel strengths of soldered interfaces were measured and then the microscopic investigation on the fractured surfaces were followed. The peel test indicated that the crack propagated either through the bulk of the soft lead-tin solder which has 55-60 kgf/cm peel strength or along the interface between the solder and the plated nickel layer which has much lower 22 kgf/cm strength. This study showed that the peel test would be a useful method to quantify the solderability as well as to recognize which is the worst interface or the softest material in a power module with a large soldering area.
치근면 활택술 후 적용된 상아질 지각과민 억제제의 상아세관 폐쇄효과에 대한 주사전자 현미경적 연구
김남균,임성빈,정진형,Kim, Nam-Kyun,Lim, Sung-Bin,Chung, Chin-Hyung 대한치주과학회 2002 Journal of Periodontal & Implant Science Vol.32 No.3
The purpose of this study was to observe the degree of surface obliteration of dentinal tubule using Gluma(R) desensitizer and MS coat(R) with 15 specimens made out of 15 extracted lower incisors. They were divided into Root planning group(control), Gluma(R) desensitizer group(test I ) and MS coat(R) group(test II). Degree of Obliteration was examined under the scanning electron microscope(${\times}$2000). The following results were obtained: 1. In the root planning group(control), the complete open of dentinal tubule surface was accounted for 73.8%, the partial obliteration for 17.2% and the complete obliteration for 9.0%. 2. In the Gluma(R) desensitizer group (test I), the complete open of dentinal tubule surface was accounted for 23.6%, the partial obliteration for 42.8% and the complete obliteration for 33.6%. 3. In the MS coat(R) group (test II), the complete open of dentinal tubule surface was accounted for 19.2%, the partial obliteration for 45.6% and the complete obliteration for 35.2%. 4. The average number of open dentinal tubules in the control was significantly higher than in the test I and II (P<0.05), but there were no statistically significant differences between the test I and II. 5. The average number of the partially obliterated and the completely blocked dentinal tubules in the control was significantly lower than the test I and II(P<0.05), but there were no statistically significant differences between the test I and II. The results of this study suggest that Gluma(R) desensitizer and MS coat(R) is significantly effective on dentinal tubule obliteration, therefore they were effective on hypersensitivity caused by periodontal treatment
계면활성제 농도 변화에 따른 셀룰로오즈계 가연물에서의 표면흡수 동적 메커니즘에 관한 연구
김남균,임경범,이동호,Kim. Nam Kyun,Lim. Kyung Bum,Rie. Dong Ho 한국방재학회 2012 한국방재학회논문집 Vol.12 No.6
2005년 대구 서문시장 화재사건의 경우, 심부까지 소화용수가 침투되지 않아 화재 진압 후 재발화로 인해 2차 화재가 발생하여 대형화재로 이어졌다. 이와 같이 일반적인 소화용수를 사용하여 다량의 다공성 물질이 적재되어 있는 공간에서 발생한 화재를 진압하는 경우, 물질의 심부에서 진행되는 연소에 대한 소화 한계성을 가지며 재발화의 위험성이 존재한다. 그러나 현재 국내의 침윤소화약제 기술기준은 표면장력에 대한 기준만 존재하여 이를 통한 약제의 성능평가는 어려운 실정이다. 따라서 본 연구에서는 종이와 섬유에 대한 계면활성제의 농도에 따른 젖음 속도 및 젖음 면적을 측정하여 다공성 물질의 표면흡수특성을 파악하였다. 이를 통하여 계면활성제 첨가에 의한 표면장력의 저하에 따라 표면에서의 흡수성이 향상됨을 확인하였다. In the case of Seo-Moon market in Deagu (2005), fire relapse after fire suppression has led the accident to a large fire due to secondary fire occurred because the fire fighting water did not penetrate until deep place. Thus, in the case of using a common fire fighting water extinguish a fire in the place where a large amount of cellulosic combustibles is loaded, there is a risk of fire relapse and that has digestive limitations for a combustion in the deep of cellulosic combustibles. However, a standard exist only on the surface tension in the current domestic wetting agent technology standards, so it is difficult to the performance evaluation of the wetting agent through the standard. Therefore, in this study, surface absorption mechanism were studied by measuring that wetting speed and wetting area according to the concentration of the surfactant for cellulosic combustibles(the paper and textile). Through this study, Depending on the degradation of the surface tension by surfactant addition, it was confirmed that the absorptiveness is improved on the surface.
잡음 학생 모델 기반의 자가 학습을 활용한 음향 사건 검지
김남균,박창수,김홍국,허진욱,임정은,Kim, Nam Kyun,Park, Chang-Soo,Kim, Hong Kook,Hur, Jin Ook,Lim, Jeong Eun 한국음향학회 2021 韓國音響學會誌 Vol.40 No.5
In this paper, we propose an Sound Event Detection (SED) model using self-training based on a noisy student model. The proposed SED model consists of two stages. In the first stage, a mean-teacher model based on an Residual Convolutional Recurrent Neural Network (RCRNN) is constructed to provide target labels regarding weakly labeled or unlabeled data. In the second stage, a self-training-based noisy student model is constructed by applying different noise types. That is, feature noises, such as time-frequency shift, mixup, SpecAugment, and dropout-based model noise are used here. In addition, a semi-supervised loss function is applied to train the noisy student model, which acts as label noise injection. The performance of the proposed SED model is evaluated on the validation set of the Detection and Classification of Acoustic Scenes and Events (DCASE) 2020 Challenge Task 4. The experiments show that the single model and ensemble model of the proposed SED based on the noisy student model improve F1-score by 4.6 % and 3.4 % compared to the top-ranked model in DCASE 2020 challenge Task 4, respectively.