• Journal of the Korean Burn Society
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• v.24 no.2
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• pp.64-67
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• 2021

Free flap surgery is commonly used for extensive facial burn. However, free flap surgery requires long operation time and difficult technique. Also, it requires further procedure to prepare the recipient vessels. Hence, applying pedicle flap surgery instead of free flap surgery is effective for patients with facial burn. Among a wide range of pedicle flaps, we performed lower trapezius myocutaneous pedicle flap to patients with third degree facial burn and got satisfactory results without complications. Lower trapezius myocutaneous pedicle flap has a wide arc of rotation so that it can cover middle and lower part of the face. Furthermore, it is thinner than other myocutaneous pedicle flap that can be used for facial reconstruction. Due to these advantages, lower trapezius myocutaneous pedicle can be an attractive option for the reconstruction of facial burn.

• Journal of the Korean Burn Society
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• v.24 no.2
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• pp.74-76
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• 2021

Postburn scar contracture of sole can cause musculoskeletal deformity, restricted range of motion, and decreased quality of life. It is very important to exhibit similar characteristics of the sole when reconstructing the sole because it has to resist shearing force and weight bearing. In this case, we performed medialis pedis free flap for the postburn scar contracture of the sole and the flap survived without complication. The patient satisfied with functional and aesthetic outcomes. Medialis pedis free flap, which is harvested adjacent to the sole, can show similar characteristic of the sole and maintain adequate contour. Moreover, this flap can be harvested without sacrifice of major vessel or nerve. Due to these advantages, medialis pedis free flap can be an ideal option for the reconstruction of the sole.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.11a
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• pp.33-37
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• 2007

최근 멀티미디어 서비스는 동영상 압축 기술 및 네트워크의 발달을 기반으로 하여 다양한 응용 서비스를 제공하고 있으며, 이 중 화상 회의 시스템은 이 두 가지 기술이 효과적으로 사용된 대표적인 예이다. 원격 사용자간의 원활한 의사전달을 위해 고려된 화상회의 시스템은 효과적인 응용 서비스로 분류되고 있지만, 이러한 서비스 제공을 위한 기술을 이용하여 빈도가 훨씬 많은 일반적인 회의를 지원하는 응용서비스는 드문 편이다. 본 논문에서는 얼굴 정보와 화자 정보를 기반으로 오프라인 회의를 보조하는 시스템을 제안한다. 제안된 시스템은 소규모의 마이크와 캠을 이용하여 화자의 위치를 파악하고 캠에서 얻어진 정보를 이용하여 얼굴 영역 정보를 분석하고 인식한 후 화자 정보를 추출하여 발언자들을 추적 하여 기록하는 기능을 제공한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.157-159
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• 2003

본 논문에서는 화상 통화를 위한 비디오 인코딩에서 화자의 얼굴 화질을 강화하여 인코딩 할 수 있는 동영상 인코딩 방법을 제안한다. 제안한 인코딩 방법에서는 이미지의 Cr 데이터 및 움직임벡터 정보를 이용하여 빠르게 화자 얼굴 영역을 검출하고, 이 영역에 대하여 선택적인 양자화를 통하여 상대적으로 많은 비트량을 할당하여 화자의 얼굴 화질을 상대적으로 강화한다. 이 방법을 H.263 인코더에 적용하는 경우 전체적으로 이런 방법을 적용하지 않았을 때와 비교하여 18% 정도의 추가적인 CPU 오버헤드가 필요하였지만, 얼굴 영역에 대하여서는 PSNR 3dB 정도의 화질이 개선될 수 있음을 실험을 통하여 증명하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1275-1278
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• 2003

This research describes a image-processing technique for the scratch detecting algorithm for ITO coated glass. The light emitter efficiency of Organic EL has a failing-off in quality due to many causes. One of the many causes was the defects of the surface in ITO coated glass. We use the logical level thresholding method for binarization of gray-scaled glass image. This method is useful to the algorithm for detecting scratch of ITO coated glass automatically without need of any prior information of manual fine tuning of parameters.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2006.06a
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• pp.34-39
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• 2006

An automated surface-strain measurement system, named ASIAS, was developed by using the image processing and stereo vision techniques in the previous studies by the corresponding author and his coworkers. This system has been upgraded mainly to improve the accuracy through image enhancement, sub-pixel measurement, surface smoothing, etc., since the first version was released. The present study has still more improved the convenience of users as well as the accuracy of measurement by processing high resolution images 8 mega pixels or more which can be easily obtained from a portable digital steal camera. It is proved that high resolution image processing greatly decreases the measurement error and gives strain data without considerable deterioration of accuracy even when the deformed grids to be measured and the master grids for camera calibration are captured together in the same image, making the whole process of strain measurement much simpler.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1997.11a
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• pp.135-138
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• 1997

Multi-view 영상 DB의 surround view 입체 화상을 재현하기 위해서는 영상 정보를 효과적으로 합성, 보간하는 방법이 필연적으로 요구된다. 다시점 입체 영상의 표시 기능을 구현하기 위해서 이론적으로는 충분한 개수의 카메라를 상하 좌우로 배치하여 영상을 획득하고 보는 이의 위치에 가장 적합한 영상을 선택하여 표현하면 된다. 이 경우 많은 수의 카메라로부터 입력되는 방대한 영상 데이터의 저장, 처리, 전송, 설치 문제 등 현실적으로 많은 제약점이 존재한다. 이러한 문제점을 해결하기 위해 기존의 블록 매칭과 같은 3D 구조 추정에 기초하여 블록 단위의 깊이 정보와 텍스쳐 정보의 추출, 다시점 영상 set의 가장 왼쪽 영상으로부터 시작하여 차례로 한 줄씩 쌓아서 얻어진 EPI(Epipolar Plane Image)에 기초한 유사 영상 값의 자취선 탐색 방법에 의한 시차와 텍스쳐 정보 추출로 전체 다안화상을 다해상도로 표현하여 전송하는 방식을 제안한다. 다해상도의 영상 표현과 점진적 전송 방법을 통해 다시점 영상 검색 시스템의 성능향상을 위한 네트워크 모델링을 제안하고자 한다.

• Journal of the Korean Burn Society
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• v.19 no.1
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• pp.12-15
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• 2016

Purpose: Firefighters are vulnerable to burn injury during firefighting. In extensive fires, conducted heat and radiant heat can cause burn injury even though firefighters are not directly exposed to fire. There has been increasing interest in the health problems of firefighters considerably since Hongje-dong fire of 2001, which claimed the lives of six fireman. However, there have been no studies done on the characteristics of firefighter burn injuries in South Korea. Therefore, we investigated the characteristics of firefighter burn injuries in a burn center. Methods: A retrospective, single-center research was performed between Jan 2006 to Dec 2015. 24 firefighters came to the burn center. The electronic medical records of patients were reviewed. Results: Flame burns (87.5%) were the major cause of burn in firefighter. All the patients suffered second-degree or third-degree burns. Mean burn size was 6.1±6.7%. 22 of 24 patients were hospitalized and 2 of 22 hospitalized patients admitted to intensive care unit. Mean length of hospitalization was 29.1±23.7 days and mean length of intensive care unit hospitalization was 6.0±1.4 days. The face was the site most commonly burned, representing 25.8% of injuries. The hand/wrist, upper extremity, and neck were the next largest groups, with 19.4, 12.9, 11.3% of the injuries, respectively. Conclusion: Firefighter burn injuries occur to predictable anatomic sites with common injury patterns. The burn size was small but, admitted patients need about 30 days of hospitalization.

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1143-1152
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• 2019

In order to study the solubilization of aniline by cationic surfactants (DTAB, TTAB and CTAB), the solubilization constant (K_s) and thermodynamic functions were measured and calculated by using the UV-Vis method. The solubilization constants of aniline with the change of temperature were measured, and the effects of addition of ionic salts and organics on the solubilization constants were investigated. These effects of additives and temperature changes were compared and analyzed for each type of surfactant, and the solubilization of aniline was analyzed microscopically by comparing and evaluating the thermodynamic functions obtained from the solubilization constants. As a result, the Gibbs free energy and enthalpy changes were both negative and the entropy changes were positive within the measured range for the solubilization of aniline by cationic surfactants. The solubilization constant value decreased with increasing temperature and increased with increasing carbon chain length of the surfactant. As the concentration of ionic salts increased, the Gibbs free energy change increased at first and then decreased. In n-butanol solution, the Gibbs free energy change tended to increase continuously with increasing the concentration of n-butanol.

• Journal of the Korean Society for Nondestructive Testing
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• v.30 no.2
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• pp.116-120
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• 2010

The wheelset, an assembly of wheel and axle, is one of important parts in railway bogie, directly related with the running safety of railway rolling stock. In this investigation, the tensile failure behavior of railway axle materials was investigated. The tensile coupons were prepared from the actual rolling stock parts, which were operated over 20 years. The tensile testing was performed according to the KS guideline. During tensile testing, an infrared camera was employed to monitor temperature changes in specimen as well as demonstrate temperature contour in terms of infrared thermographic images. The thermographic images of tensile specimens showed comparable results with mechanical behavior of tensile materials. In this paper, the failure mode and behavior of railway axle materials were provided with the aid of infrared thermography technique.