• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제47권2호
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• pp.112-119
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• 2021

Objectives: Myxomatous odontogenic tumors (MOTs) are the third most common odontogenic tumors in the oral and maxillofacial region. Due to its slow-growing, but locally invasive nature, the tumor is usually detected by accident or only when it becomes a large mass, which causes facial deformity. Materials and Methods: Current study reports three unusual cases of MOT including huge myxoma involve the mandible in middle-aged man, MOT with ossifying fibroma pattern in mandible, and MOT in maxilla of young female patient. The diagnosis and treatment strategy of MOTs was also summarized and updated. Results: In reported three cases of patients with large MOTs, surgical treatment was indicated with fibular free flap reconstruction in the mandible and plate reconstruction in the maxilla. The tumors were successfully treated with radical resection and did not show signs of recurrence during the follow-up period. Conclusion: Surgical treatment indication depends on size, the position of the lesion, patient systemic condition and surgeon individual experience. In the case of a large tumor, radical resection and reconstruction is the standard surgical strategy. The conservative surgical treatment including enucleation with wide curettage is still under controversy. The recurrence rate for MOTs is significantly high, up to 30%, therefore long-term follow-up is essential.

• 대한토목학회논문집
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• 제42권2호
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• pp.151-162
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• 2022

스마트 건설 기술의 도입으로 공장에서 일괄 대량생산이 가능한 프리팹 부재에 대한 관심이 높아졌다. 프리팹 프리스트레스 콘크리트 거더는 가설시 프리팹 바닥판과의 정합성을 위해 제작부터 가설 전 단계까지 거더의 형상관리가 중요하다. 이 연구에서는 프리팹 거더의 상연 및 하연에 병치된 변형률 측정치를 이용한 캠버 재구성 기법을 제시한다. 특히, 긴장력 도입 이후 가설 전까지 콘크리트의 시간 의존적 거동이 고려된 변형률 데이터에 대해 캠버 재구성 기법을 적용한다. 몬테카를로 수치 모사를 통해 제한된 센서의 개수, 계측 오차 그리고 비선형적 시간 의존적 거동들에 대해 재구성된 캠버의 통계적 정확도를 분석하고 타당성을 검증한다.

• 대한골관절종양학회지
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• 제9권1호
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• pp.115-123
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• 2003

연구계획: 골반골의 악성골종양의 재건술에서 체외열처리를 이용한 재활용 자가골 이식술 및 인공 관절 치환술을 시행한 3례의 후향적 연구 연구목적: 골반골의 악성골종양의 재건술에서 체외열처리를 이용한 재활용 자가골 이식술 및 인공 관절 치환술이 골반골의 재건에 있어 그 유용성을 알아보고자 하였다. 증례: 증 례 1~20세 여자 환자로 3개월 전부터 시작된 우측 고관절부와 대퇴부 동통을 주소로 외부 병원에서 우측 장골에 소파술 및 골 시멘트 충전술 시행 후 악성 골종양으로 진단하에 술 후 방사선 치료 6회 시행 후 전원되어 우측 장골 광범위 절제술 및 섭씨 132도에서 2분간 열처리 후 자가골 재삽입술 시행하고 우측 고관절의 인공 관절 치환술 (ABG$^{(R)}$)을 병행하였다. 수술 당시 전이의 증거는 없었으며 술후 조직 병리 검사상 고분화 골육종 진단되었으며 술전 또는 술후 화학 요법은 시행하지 않았다. 증 례2~56세 여자 환자로 약 3개월 전부터 시작된 우측 대퇴부 동통으로 방사선 검사상 이상 발견되어 전원 후 절개 생검 시행하였다. 결과상 골육종 진단되어 우측 골반골 광범위 절제술 후 섭씨 6 5도 하에서 3 0분간 저온 열처리 후 자가골 삽입 고정술 시행하고 우측 고관절에 대하여 인공 관절 치환술 (ABG$^{(R)}$)을 병행하였다. 수술 당시 전이의 증거는 없었으며 술 후 조직 병리 검사상 고등급 섬유모세포형의 골육종이 진단되었다. 술후 화학 요법은 HDMTX, ADR, CDDP으로 시행하였다. 증 례 3~46세 여자 환자로 우연히 발견된 좌측 장골의 종괴로 연골육종 의심 하에 좌측 골반골 광범위 절제술 후 섭씨 65도 하에서 30분간 저온 열처리 후 자가골 삽입 고정술 시행하고 좌측 고관절에 대하여 인공 관절 치환술 (Protek$^{(R)}$)을 병행하였다. 수술 당시 전이의 증거는 없었으며 술후 조직 병리 검사상 II/III 등급의 연골육종이 진단되었다. 결과: 최종 추시상 각 증례의 종양학적 및 기능적 결과는 증례 1은 7년 추시상 국소적 재발이 없는 상태였으며 Ennecking 등에 따른 기능적 평가 지수에서 53%로 평가되었다. 방사선 추시상 약 1년에서 1년 6개월 사이에 골유합이 관찰되었으며 최종 추시시 장골의 재건 금속판의 파괴 소견이 보였으나 환자의 증상과 연관되지는 않았다. 증례 2는 3년 6개월 추시상 국소적 및 원격 재발이 없는 상태였으며 기능적 평가 지수는 60%로 평가되었다. 증례 3은 7개월 추시상 국소적 및 원격 재발이 없는 상태였으며 기능적 평가 지수는 63%로 평가되었다. 결론: 체외 열처리를 이용한 재활용 자가골 이식술 및 인공 관절 치환술을 시행한 3례에서 비교적 만족할만한 종양학적 및 기능적 결과를 보였으며 한국에서 동종 골 이식술이 어려운 점을 감안할 때 이 방법은 골반골을 재건하는데 한 방법이 될 수 있을 것이라 사료된다.

• Archives of Plastic Surgery
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• 제38권1호
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• pp.96-101
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• 2011

Purpose: In treatment of facial bone fracture, occurred in children, we generally use wires, miniplate, absorbable plate or their combination. These foreign bodies can be palpable, and sometimes may cause infections, and need reoperation for removing. When bone fragments are multiple, small or thin, they are hard to handle and make accurate reduction of all fragments. In these cases, a biodegradable tissue adhesive, Histoacryl$^{(R)}$ (n-butyl-2-cyanoacrylate), can be used as fixation technique for small, multiple, and thin fracture fragments. Methods: 3 years old and 6 years old children, who has comminuted fracture on frontal sinus, we used Histoacryl$^{(R)}$ for fixation of multiple bone fragments. After approaching by coronal incision, we pulled out all bone fragments and reconstructed bone fragments by Histoacryl$^{(R)}$ and fixed those on frontal sinus by absorbable plates. Results: Photographs and 3-dimensional CT obtained preoperatively and postoperatively. And we compared them each other in terms of accuracy of reconstructed bony contour. We could reconstruct almost all bone fragments easily along 3-dimensional structure and get excellent aesthetic results. There was no complication such as infection. Conclusion: In treatment of comminuted facial bone fracture, occurred in children, Histoacryl$^{(R)}$ is an excellent method for accurate reconstruction in small and thin bone fragments which cannot be fixed by wire, miniplate or absorbable plate without complication.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.1018-1021
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• 2007

This paper explores the use of BEM based NAH to reconstruct the surface vibration of a plate in a rectangular finite cavity, in which the distances between sensors and the nearest points on the source surface are not equal. In such circumstances, different degree of information on propagating and non-propagating wave components will be detected by sensors at different positions, as well as the influence of measurement noise will vary significantly from the nearest points of measurement to the farthest ones. On the other hand, the condition number of the vibro-acoustic transfer function matrix relating normal surface velocities and field pressures will becomes high, numerically indicating an increase of linear dependency between rows of transfer function matrix. The combination of poor measurement and high condition number will result inaccurate reconstruction. Therefore, one approach to be investigated in this work is to select the measurement positions in such ways that reduce measurement redundancy, as it indicated by the condition number. The improvement is found to be significant in the numerical simulations utilizing two different criterions, spanning from over-determined to under-determined cases, and in the validation experiment.

• Archives of Reconstructive Microsurgery
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• 제23권2호
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• pp.89-92
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• 2014

An 8-year-old girl diagnosed with dilated cardiomyopathy and Russell-Silver syndrome was admitted to our pediatric intensive care unit due to low cardiac output and multiple-organ dysfunction. The patient was placed on the heart transplant waiting list and extracorporeal membrane oxygenation was performed as a bridge to transplantation. After 17 days, heart transplantation was performed. The donor was a 46-year-old female (weight, 50 kg; height, 150 cm). The donor:recipient weight ratio was 3.37:1. Because the dimension and volume of the recipient's thoracic cage were insufficient, the sternum could not be closed. Nine days after transplantation, the patient underwent delayed sternal closure. To obtain adequate space, we left the sternum 4.5 cm apart from each margin using four transverse titanium plates. A transverse rectus abdominis musculocutaneous flap was chosen to cover the wound. Due to the shortage of donors, a size-mismatched pediatric heart transplantation is sometimes unavoidable. Closure of the opened sternum of a transplant recipient can be challenging. Sternal reconstruction after an extremely oversized heart transplantation with transverse titanium plate fixation and a musculocutaneous flap can effectively achieve sternal closure and stability.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.264-267
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• 2006

This paper describes the accident analysis by modeling the current transformer mounting in meaium voltage metal-clad switchgear(MCSG). In analyzing the accident the reconstruction at the current transformer mounting(VCB connecting guide) has to be taken into account. The accident was modelled as a 3-phase ground fault mounting between the end plate of a high voltage lines and the safety shutter at the current transformer mounting of the VCB inside the metal clad switchgear. Since the outside maintenance of the metal clad switchgear is restricted by the enclosed compartments, its circumference has to be kept clean. Through the reconstruction results, it was confirmed that the fault of the enclosed switchboard could be reduced when the shutter made of Fe material was changed into an insulation.

• Structural Engineering and Mechanics
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• 제71권6호
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• pp.751-761
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• 2019

Lamb wave technology is a promising technology in the field of structural health monitoring and can be applied in the detection and monitoring of defects in plate structures. Based on the reconstruction algorithm for the probabilistic inspection of damage (RAPID), a Lamb-based detection and evaluation method of through-thickness rectangular notches in metal plates was proposed in this study. The influences of through-thickness rectangular notch length and the angle between sensing path and notch length direction on signals were further explored through simulations and experiments. Then a damage index calculation method which focuses on both phase and amplitude difference between detected signals and baseline signals was proposed. Based on the damage index difference between two vertically crossed sensing paths which pass through the notch in a sensor network, the notch direction identification method was proposed. In addition, the notch length was determined based on the damage index distribution along sensing paths. The experimental results showed that the image reconstructed with the proposed method could reflect the information for the evaluation of notches.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제45권2호
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• pp.116-120
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• 2019

Clear cell odontogenic carcinoma (CCOC), a rare tumor in the head and neck region, displays comparable properties with other tumors clinically and pathologically. In consequence, an incorrect diagnosis may be established. A 51-year-old male patient who was admitted to the Department of Oral and Maxillofacial Surgery at Pusan National University Dental Hospital was initially diagnosed with ameloblastoma via incisional biopsy. However, the excised mass of the patient was observed to manifest histopathological characteristics of ameloblastic carcinoma. The lesion was ultimately diagnosed as clear cell odontogenic carcinoma by the Department of Oral Pathology of Pusan National Dental University. Therefore, segmental mandibulectomy and bilateral neck dissection were performed, followed by reconstruction with fibula free flap and reconstruction plate. Concomitant chemotherapy radiotherapy was not necessary. The patient has been followed up, and no recurrence has occurred 6 months after surgery.

• Smart Structures and Systems
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• 제15권6호
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• pp.1463-1479
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• 2015

Lamb waves have been a promising candidate for quantitative damage identification for various engineering structures, taking advantage of their superb capabilities of traveling for long distances with fast propagation and low attenuation. However, the application of Lamb waves in damage identification so far has been hampered by the fact that the characteristic signals associated with defects are generally weaker compared with those arising from boundary reflections, mode conversions and environmental noises, making it a tough task to achieve satisfactory damage identification from the time series. With awareness of this challenge, this paper proposes a time reversal-based technique to enhance the strength of damage-scattered signals, which has been previously applied to bulk wave-based damage detection successfully. The investigation includes (i) an analysis of Lamb wave propagation in a plate, generated by PZT patches mounted on the structure; (ii) an introduction of the time reversal theory dedicated for waveform reconstruction with a narrow-band input; (iii) a process of enhancing damage-scattered signals based on time reversal focalization; and (iv) the experimental investigation of the proposed approach to enhance the damage identification on a composite plate. The results have demonstrated that signals scattered by delamination in the composite plate can be enhanced remarkably with the assistance of the proposed process, benefiting from which the damage in the plate is identified with ease and high precision.