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박종웅,강현귀 대한척추외과학회 2023 대한척추외과학회지 Vol.30 No.4
The pelvic bone is an important anatomical site for patient-specific bone reconstruction using 3D printing technology. The reconstruction of bone defects in this part is challenging because the pelvic bone must transfer weight to the spine through the hip joint and the sacroiliac joint, as well as the pelvic cavity organs and complex neurovascular structures. Unlike the long bones of the limbs, commercially available bone substitute implants are difficult to use, and even biological reconstructions using autologous bone or allogeneic bone transplantation have several limitations in terms of mechanical strength. In contrast, 3D printing bone reconstruction does not simply output the same anatomical bone defect area but minimizes complications and improves functional recovery by reinforcing or reducing the implant and changing its shape and surface in consideration of the degree and quality of the remaining bone and soft tissue condition. As 3D printing for implant production and utilization is a new technology, academic exchange to share related clinical experiences in various fields is important. The design for 3D printing bone reconstruction is different for each patient and there are infinite possibilities, but some aspects are consistent in terms of basic details and some technical points. Therefore, in this review, we will share clinical cases of patient-specific pelvic bone reconstruction to help in the challenge of 3D printing for bone reconstruction surgery.
폐타이어로 성형제조된 부정형 과립담체에 부착된 미생물의 측정방법
박종웅,송주형 대한상하수도학회 2003 상하수도학회지 Vol.17 No.2
This study was carried out to know the physicochemical properties and determine the measurement method of attached biomass in irregular shape granular (ISG) media molded with waste tire. The size of ISG media and specific surface area were Φ4-10㎜ and 0.00412㎡/g, respectively. The using of pretreatment agents as 0.8N CuSO_4-0.7N Sulfamic acid was proper to prevent self-oxidation of attached biomass on ISG media. The detaching method of attached biomass in ISG media was suitable for conducting ultrasonic and alkali treatment at the same time. The optimum alkali concentration and washing time were 0.125N NaOH and 120min, respectively. Finally, it was concluded that the result of this study could be establishing as a measurement method of attached biomass on ISG media molded with waste tire.
A new bite block for panoramic radiographs of anterior edentulous patients: A technical report
박종웅,Khanthaly Symkhampha,허경회,이원진,허민석,이삼선,최순철 대한영상치의학회 2015 Imaging Science in Dentistry Vol.45 No.2
Purpose: Panoramic radiographs taken using conventional chin-support devices have often presented problems with positioning accuracy and reproducibility. The aim of this report was to propose a new bite block for panoramic radiographs of anterior edentulous patients that better addresses these two issues. Materials and Methods: A new panoramic radiography bite block similar to the bite block for dentulous patients was developed to enable proper positioning stability for edentulous patients. The new bite block was designed and implemented in light of previous studies. The height of the new bite block was 18 mm and to compensate for the horizontal edentulous space, its horizontal width was 7 mm. The panoramic radiographs using the new bite block were compared with those using the conventional chin-support device. Results: Panoramic radiographs taken with the new bite block showed better stability and bilateral symmetry than those taken with the conventional chin-support device. Patients also showed less movement and more stable positioning during panoramic radiography with the new bite block. Conclusion: Conventional errors in panoramic radiographs of edentulous patients could be caused by unreliability of the chin-support device. The newly proposed bite block for panoramic radiographs of edentulous patients showed better reliability. Further study is required to evaluate the image quality and reproducibility of images with the new bite block.
악교정수술에서 광전자 포인트 마커를 이용한 상악골 위치 변화의 계측 및 계산 방법 연구
박종웅,김성민,어미영,박정민,명훈,이종호,김명진,Park, Jong-Woong,Kim, Soung-Min,Eo, Mi-Young,Park, Jung-Min,Myoung, Hoon,Lee, Jong-Ho,Kim, Myung-Jin 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.3
Purpose: To apply a computer assisted navigation system to orthognathic surgery, a simple and efficient measuring algorithm calculation based on affine transformation was designed. A method of improving accuracy and reducing errors in orthognathic surgery by use of an optical tracking camera was studied. Methods: A total of 5 points on one surgical splint were measured and tracked by the Polaris $Vicra^{(R)}$ (Northern Digital Inc Co., Ontario, Canada) optical tracking system in two cases. The first case was to apply the transformation matrix at pre- and postoperative situations, and the second case was to apply an affine transformation only after the postoperative situation. In each situation, the predictive measuring value was changed to the final measuring value via an affine transformation algorithm and the expected coordinates calculated from the model were compared with those of the patient in the operation room. Results: The mean measuring error was $1.027{\pm}0.587$ using the affine transformation at pre- and postoperative situations and the average value after the postoperative situation was $0.928{\pm}0.549$. The farther a coordinate region was from the reference coordinates which constitutes the transform matrixes, the bigger the measuring error was found which was calculated from an affine transformation algorithm. Conclusion: Most difference errors were brought from mainly measuring process and lack of reproducibility, the affine transformation algorithm formula from postoperative measuring values by using of optic tracking system between those of model surgery and those of patient surgery can be selected as minimizing the difference error. To reduce coordinate calculation errors, minimum transformation matrices must be used and reference points which determine an affine transformation must be close to the area where coordinates are measured and calculated, as well as the reference points need to be scattered.
호기성 침지형 생물막법을 이용한 Polyester 감량폐수의 처리
박종웅,김대희 한국환경보건학회 1997 한국환경보건학회지 Vol.23 No.3
The objective of this study was to investigate biodegradation of TPA(terephthalic acid) and EG (ethylene glycol), treatment efficiency of polyester weight loss wastewater and microbial characteristics by aerated submerged biolfilm(ASB) p.rocess. In a batch reactor, pH increased from 7.0 to 8. 5 in the biodegradation of TPA. Whereas, in case of EG, decreased from 7.0 to 5.2. COD concentration rapidly decreased within 24hr in the biodegradation of TPA and EG. COD removal velocity constant(k) were 0.065-0.088 hr$^{-1}$. The biodegradation velocity of TPA was 1.4 times faster than that of EG. The ratio of suspended biomass to the total biomass in the reactor was 18.3-33.3%, increased as a high ratio of EG content. Biofilm thickness, biofilm dry density and attached biomass were 346-432 $\mu$m, 41.8-61.9 mg/cm$^3$, 1.45-2.67 mg/cm$^2$, respectively. There values increased as a high ratio of TPA content. In the hydraulic retention time of 36 hr, organic loading rate of 4 kgCOD/m$^3\cdot$ day and packing ratio of 70%, the effluent concentrations of TCOD, SCOD in a continuous flow reator were 1,388 mg/l, 147 mg/l and removal efficiencies were 77%, 97.6%, respectively.