• 대한치과교정학회지
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• 제35권2호
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• pp.148-152
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• 2005

하악 좌측 견치의 미맹출을 주소로 내원한 10세 여환의 과거 병력 조사 중 3년 전 교통사고로 하악 좌측 골체부에 골절이 생겨 miniplate로 관혈적 정복술을 시행받은 것을 발견하였다. 통상적인 외과적 노출과 교정적 견인치료로는 견치 맹출에 실패하였고, miniplate를 제거함으로써 정상적인 매복 견치 맹출에 성공하였기에 보고하는 바이다.

• 설비공학논문집
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• 제11권6호
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• pp.749-757
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• 1999

Holographic interferornetric tomography can provide reconstruction of instantaneous three dimensional gross flow fields. The technique however confronts ill-posed reconstruction problems in practical applications. Experimental data are usually limited in projection and angular scanning when a field is captured instantaneously or under the obstruction of test models and test section enclosures. An algorithm, based on a series expansion method, has been developed to improve the reconstruction under the ill-posed conditions. A three-dimensional natural convection flow around two interacting isothermal cubes is experimentally investigated. The flow can provide a challenging reconstruction problem and lend itself to accurate numerical solution for comparison. The refractive index fields at two horizontal sections of the thermal plume with and without an opaque object are reconstructed at a limited view angle of 80" The experimental reconstructions are then compared with those from numerical calculation and thermocouple thermometry. It confirms that the technique is applicable to reconstruction of reasonably complex, three-dimensional flow fields.elds.

• Tuberculosis and Respiratory Diseases
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• 제78권2호
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• pp.128-132
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• 2015

Bronchopulmonary dysplasia (BPD) is related to decreased lung function throughout life. However, the pathology and radiology pattern of BPD of adults are not documented well yet. In this case report, we present BPD case of an adult monozygotic twin showing nearly identical lesions on chest computed tomography (CT). CT images showed mixed areas of ground-glass and reticular opacities in both lungs. They had common histories of pneumonias requiring mechanical ventilations in period of infants. Pulmonary function test of one patient showed a pulmonary insufficiency with airway obstruction. Pathologic findings showed bronchiolar hyperplasia and peribronchiolar fibrosis which was similar to classic BPD patients. Our twin case report might help provide distinguishing pathology and radiology pattern of an adult pulmonary sequelaes of BPD. It might be reasonable to make close follow-up for BPD patients to evaluate the long-term outcomes of BPD survivors.

• Journal of information and communication convergence engineering
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• 제19권2호
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• pp.108-113
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• 2021

Multiview autostereoscopic three-dimensional (MA3D) displays have the disadvantage that the single-view resolution decreases as the number of views increases. Furthermore, the resolution of MA3D displays is relatively degraded, even though the resolution of two-dimensional displays has increased recently. Therefore, it is unattractive to consumers, and the single-view resolution enhancement of MA3D displays is required. In this study, we developed a method for supplementing the single-view resolution of MA3D displays using a plate beam splitter that can show two MA3D displays simultaneously. By applying our proposed method, the resolution of a single view can increase, and the visual obstruction by the optical plate, which is a problem for MA3D displays, can be solved. In addition, an MA3D display was optically designed and fabricated using a parallax barrier. Finally, the experimental optical results obtained using the proposed method and the only MA3D display were compared.

• Tuberculosis and Respiratory Diseases
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• 제62권5호
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• pp.437-440
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• 2007

기관절개술은 가장 오래된 수술기술 중의 하나로 상기도 폐쇄의 경감, 장기간의 기계호흡유지, 보조적 기계호흡시에 기도 저항의 감소 등의 목적으로 시행할 수 있다. 기관절개술에 따른 초기합병증으로는 기흉, 피하조직기종, 절개부위 출혈, 종격동 기종, 흡인, 기관절개 관 전위 등을 들 수 있다. 수술에 따른 피하조직기종과 기흉은 0.9-5%에서 보고되었다. 본 증례에서는 기관절개술 직후에 피하조직기종과 양측 폐에서 발생한 긴장성 기흉을 경험하였기에 보고하는 바이다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제13권1호
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• pp.53-62
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• 1991

기관절제술은 기도확보를 위해 다양한 임상적 상황에서 행해지는 술식으로 1546년에 Brasabola에 의해 처음 성공적으로 시행되었다. 기관절제술의 적응증으로는 상기도 폐쇄의 완화, pulmonary toilet의 촉진, dead space의 감소 및 mechanical ventilation의 장기 사용시 등을 들 수 있겠다. 그동안 term에도 변화가 있었는데, 1718년 까지는 "bronchotomy"란 term 이 사용되었고 그후 "tracheotomy"란 term 이 사용되었으나 1820년 이후에는 "tracheostomy"란 term 이 나오게 되어 현재 이 두가지 term 이 구별없이 사용되고 있다. 기도폐쇄를 야기시킬 수 있는 악안면 부위의 외상 혹은 여러가지 질병의 증가 추세로인해 구강외과의사가 기관절제술을 시행해야할 상황을빈번히 맞게 된다. 이에, 본 교실에서 기관절제술을 시행한 31 명의 환자에 대한 임상적 고찰을 통해 숙련된 기관절제술 및 그 처치능력의 중요성을 보고하는 바이다.

• EDISON SW 활용 경진대회 논문집
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• 제5회(2016년)
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• pp.455-462
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• 2016

Recently, followed by rapid growth of robotics field, multi-linkage mechanism which can even pass by rough road is getting lots of attention. In this paper, I focused on Jansen mechanism. It's a kinematics object which is named after Dutch artist Theo jansen. Jansen mechanism embraces structure and mechanism which creates locomotion with the combination of the power and simple structure. Theo jansen suggests a 'Holy number'. It's an ideal ratio of leg components length. However, if there's desired gait locomotion, you have to adjust the ratio and the length. But even slight change of the length could cause a big change at the end-point. To solve this problem, I suggest a reverse engineering method to get a ratio of each links by nonlinear optimization with pre-set desired trajectory. First, we converted a movement of the joint of Jansen mechanism to vectors by kinematics analysis of multi-linkage structure. And we showed the trajectory at the end-point. After that, we set desired trajectory which we found most ideal. Then we got the length of the leg components which draws a trajectory as same as trajectory we set, using Multi-objective genetic algorithm toolbox in MATLAB. Result is verified by Edison designer and mSketch. And we analyzed if it could pass through the obstruction which is set dynamically.

• Clinical and Experimental Pediatrics
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• 제51권7호
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• pp.766-770
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• 2008

심장의 원발성 종양은 소아에서는 매우 드문 질환이다. 횡문근종은 태아, 영아 및 소아 연령에서 가장 흔한 원발성 심장 종양으로 결절성 경화증이 동반되는 것으로 보고되고 있다. 결절성 경화증은 뇌, 심장, 피부 및 기타 장기들을 침범하는 신경피부 증후군으로, 결절성 경화증을 가진 영아의 50-64%에서 동반된다. 심장 횡문근종은 종괴는 심방을 비롯하여 심실 중격과 심실벽에 다발성으로 존재하며 종양의 위치와 크기, 침범 정도에 따라 심장 유출로 협착 및 심부전과 같은 여러 가지 임상 양상을 보일 수 있다. 드물지만 부정맥을 주증상으로 발현하는 경우도 보고되고 있다. 하지만 대부분 심장의 횡문근종이 특별한 문제를 일으키지 않고 성장과 함께 쇠퇴되는 경향을 보이므로 극히 일부분에서만 장기적인 항부정맥제 사용이 요구된다. 환자의 최종적인 예후는 동반되는 뇌병변에 의해 결정되는 경향이 있다. 저자들은 상심실성 빈맥으로 입원치료 중 진단된 심장 횡문근종을 가진 결절성 경화증 1예를 경험하였기에 보고하는 바이다.

• Clinical and Experimental Pediatrics
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• 제58권4호
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• pp.154-157
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• 2015

Plastibell is one of the three most common devices used for neonatal circumcision in the United States, with a complication rate as low as 1.8%. The Plastibell circumcision device is commonly used under local anesthesia for religious circumcision in male neonates, because of cosmetic reasons and ease of use. Occasionally, instead of falling off, the device may get buried under the skin along the shaft of the penis, thereby obstructing the normal flow of urine. Furthermore, the foreskin of neonates is highly vascularized, and hence, hemorrhage and infection are possible when the skin is cut. Necrosis of penile skin, followed by urethral obstruction and renal failure, is a serious surgical mishap requiring immediate corrective surgery and medical attention. We report a case of fulminant urosepsis, acute renal failure, and pyelonephritis in a 4-day-old male neonate secondary to impaction of a Plastibell circumcision device. Immediate medical management was initiated with fluid resuscitation and mechanical ventilation; thereby correcting life threatening complications. Pediatricians and Emergency Department physicians should be cognizant of the complications from Plastibell circumcision device in order to institute appropriate and timely management in neonates.

• 한국분말재료학회지
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• 제23권3호
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• pp.247-253
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• 2016

In this study, solid solution heat treatment of consolidated nickel-based superalloy powders is carried out by hot isotactic pressing. The effects of the cooling rate of salt quenching, and air cooling on the microstructures and the mechanical properties of the specimens are analyzed. The specimen that is air cooled shows the formation of serrated grain boundaries due to their obstruction by the carbide particles. Moreover, the specimen that is salt quenched shows higher strength than the one that is air cooled due to the presence of fine and close-packed tertiary gamma prime phase. The tensile elongation at high temperatures improves due to the presence of grain boundary serrations in the specimen that is air cooled. On the contrary, the specimen that is salt quenched and consists of unserrated grain boundaries shows better creep properties than the air cooled specimen with the serrated grain boundaries, due to the negative creep phenomenon.