• Journal of the Korean Orthopaedic Association
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• 제56권2호
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• pp.103-116
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• 2021

The use of 3-dimensional (3D) printing is becoming more common, and its use is increasing in the orthopedic surgery. Currently, there are four major methods of using 3D printing technology in orthopedic surgery. First, surgical planning simulation using 3D printing model; second, patient-specific surgical instruments; third, production of customized prosthesis using 3D printing technique; fourth, patient-specific prosthesis produced by 3D printing. The areas of orthopedic surgery where 3D printing technology can be used are shoulder joint, spine, hip and pelvis, knee joints, ankle joint, and tumors. Since the diseases and characteristics handled by each area are different, the method of using 3D printing technology is also slightly different in each area. However, using 3D printing technology in all areas can increase the efficiency of surgery, shorten the surgery time, and reduce radiation exposure intraoperatively. 3D printing technology can be of great help in treating patients with particularly complex and difficult orthopedic diseases or fractures. Therefore, the orthopedic surgeon should make the most of the benefits of the 3D printing technology so that patient can be treated effectively.

• KSCE Journal of Civil and Environmental Engineering Research
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• 제42권1호
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• pp.127-134
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• 2022

Recently, policies and research to prevent increasing construction accidents have been actively conducted in the domestic construction industry. In previous studies, the prediction model developed to prevent construction accidents mainly used only structured data, so various characteristics of construction sites are not sufficiently considered. Therefore, in this study, we developed a machine learning-based construction accident prediction model that enables the characteristics of construction sites to be considered sufficiently by using both structured and text-type unstructured data. In this study, 6,826 cases of construction accident data were collected from the Construction Safety Management Integrated Information (CSI) for machine learning. The Decision forest algorithm and the BERT language model were used to train structured and unstructured data respectively. As a result of analysis using both types of data, it was confirmed that the prediction accuracy was 95.41 %, which is improved by about 20 % compared to the case of using only structured data. Conclusively, the performance of the predictive model was effectively improved by using the unstructured data together, and construction accidents can be expected to be reduced through more accurate prediction.

• Journal of the Korean Orthopaedic Association
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• 제52권1호
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• pp.73-82
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• 2017

Purpose: To assess the chronological changes of disease-related kyphosis after chemotherapy alone. Materials and Methods: A total of 101 children aged 2 to 15 years with spinal tuberculosis, accompanied by various stages of disease processes were enrolled for analysis. By utilizing the images in them, the growth plate condition and chronological changes of kyphosis after chemotherapy were analyzed at two points in time; the first assessment was at post-chemotherapy one-year and second at the final discharge. Results: Complete disc destruction in the cervical, dorsal and lumbosacral spines was observed in 2 out of 40 children (5.0%), 8 out of 30 children (26.7%), and 6 out of 31 children (19.4%), respectively. In those cases, the residual kyphosis inevitably developed. In the remaining children, the discs were intact or partially damaged. Among the 101 children kyphotic deformity was maintained without change in 20 children (19.8%). Kyphosis decreased in 14 children (13.9%), while it increased in 67 children (66.3%) with non-recoverably damaged growth plate. Conclusion: Although it is tentatively possible to predict the deformity progress or non-progress and spontaneous correction at the time of the initial treatment, its predictive accuracy is low. Therefore, assessment of the chronological changes should be performed at the end of chemotherapy. In children with progressive curve change, assessment of deformity should be continued until maturity.

• Journal of the Korean Orthopaedic Association
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• 제53권6호
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• pp.540-546
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• 2018

Purpose: The purpose of this study was to suggest a multimodal diagnostic approach to determine the cause of the disease in patients diagnosed with synovitis of the wrist and who underwent synovectomy. Materials and Methods: Twenty-nine patients, who underwent contrast magnetic resonance imaging (MRI) preoperatively and synovectomy from January 2000 to December 2013, were reviewed retrospectively. Among them, 17 patients underwent a $Tc^{99m}$ white blood cell (WBC) scan preoperatively. In patients who met the diagnostic criteria of rheumatoid arthritis (RA), the diagnosis was confirmed as RA if the MRI finding or histology was compatible with RA. If the MRI finding and histology were disparate, the final diagnosis was made based on the histologic finding. Results: Of the nine patients who met the diagnostic criteria of RA, seven patients were finally diagnosed as RA and two patients as tuberculous arthritis. Of the 20 patients who did not meet the diagnostic criteria of RA, the MRI findings and histology were consistent with the same disease in 12 patients. In the remaining eight patients, five were diagnosed with nonspecific chronic synovitis, one with RA, and two with tuberculous arthritis based on the clinical findings, MRI, and histology findings. Conclusion: MRI and a WBC scan are very useful imaging modalities for diagnosing the causative condition of the wrist synovitis. A histology evaluation after synovectomy can also be useful in cases with a difficult diagnosis or are refractory to medications.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2001년도 가을 학술발표논문집 Vol.28 No.2 (3)
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• pp.40-42
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• 2001

캐쉬 일관성 프로토콜의 하나인 MESI 프로토콜은 다중 프로세싱 환경에서 각각의 프로세서와 메모리 사이의 데이터 일관성을 유지하기 위해 캐쉬, 메모리 등의 통신 개체들을 조정하는 일종의 규칙들 중 하나이다. 프로세서의 수가 많아지고 시스템이 복잡해 질 경우 MESI 프로토콜을 정확하게 설계하고 그 동작을 분석하기는 매우 어렵다. 본 연구에서는 정형기법 도구인 ESTEREL을 이용하여 MESI 프로토콜을 설계하고 그 동작의 안정성을 검증하여, 시스템의 정확성과 안정성을 보장하는 방법에 대해 논한다.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 대한견주관절학회 2006년도 제4차 연수강좌
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• pp.147-151
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• 2006

외측 및 내측 상과염은 흔히 관찰되며 지속적인 치료 과정의 관찰이 요구되는 건의 질병이지만 현실적으로는 전체적인 질병의 발생과 치료의 과정에 대한 이해가 부족한 상태에서 모든 의사들이 치료 할 수 있는 질병처럼 취급되면서 초기 치료에서 수술적 치료까지의 결정이 전문적인 정형외과 전문의에 의하여 시행되지 못하여 적절한 시기에 적합한 치료가 선택되지 못하고, 각 치료 과정의 정보가 공유되지 않아 환자에게 꼭 필요한 치료 방법을 선택하는데 어려움이 발생하고 있는 실정이며, 치료 과정중의 불편함이 환자에게 전가되고 있는 상황이다. 따라서 전문적인 지식을 갖춘 정형외과 전문의의 지속적인 관심과 적절한 치료 방법의 선택으로 환자의 유병 기간을 최대한 단축 할 수 있다고 생각한다.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 1999년도 가을 학술발표논문집 Vol.26 No.2 (1)
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• pp.596-598
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• 1999

본 논문은 UML-RT 도구로서 GCSR(Graphical Communicating Shared Resource)를 제안하는데 있어UML의 기본 다이아그램 중 하나인 Statechart와 비교 분석함으로 그 기능과 장.단점을 제시한다. 기존의 정형 명세 언어인 Statechart에서는 실시간 시스템이 명세에 있어 필수적인 시간적인 개념과 우선순위 개념이 제한적이다. 그러나 정형명세의 또 다른 언어인 GCSR이 가진 시간적 개념과 우선순위 개념의 효용을 보이고 이를 Statechart의 실시간 시스템의 명세와 비교함으로 UML-RT로서의 GCSR을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2015년도 추계학술발표대회
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• pp.1187-1190
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• 2015

최근에 비정형 데이터의 잠재적 가치를 유용한 데이터로써 사용하려는 경우가 많아지고 있다. 특히 트위터는 사용자의 상태나 이벤트가 잘 나타나 있어서 하나의 사용자의 이벤트로서 간주될 수 있다. 본 논문은 트위터에서 발생하는 이벤트에 주목하여, 감기라는 이벤트를 트위터 내에서 추적하고자 한다. 추적을 위해서는 트위터를 판단할 필요가 있는데, 이를 위해 기존의 감성 사전 방식 중 하나인 통계적 사전 구축을 기반으로 키워드를 활용하여 감기 판단 사전을 구축하는 방식을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2006년도 가을 학술발표논문집 Vol.33 No.2 (A)
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• pp.469-474
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• 2006

전통적인 임베디드 시스템 개발은 하드웨어와 소프트웨어가 독립적으로 개발된다. 그러나 시스템 개발 후 오류 발생 시, 하드웨어와 소프트웨어 둘 중 어디에서 발생했는지 알아내기 어려웠다. 따라서 임베디드 시스템 개발을 위해 하드웨어/소프트웨어의 통합 설계 방법이 연구기관들에 의해 제시되어 왔다. 본 논문은 현실적으로 많이 사용되고 있는 일반 임베디드 시스템 개발 방법으로부터 접근하는 HW/SW 통합 개발 방법을 제안하였다. 즉, 이미 만들어진 하드웨어를 설계 단계로 끌어올려 정형 기법을 통해 하드웨어를 설계 및 정형 검증하여 견고한 하드웨어를 만들고, 이를 기반으로 소프트웨어를 정형 명세 및 검증하는 하드웨어/소프트웨어 통합 개발을 수행하였다. 따라서 개발 후 하드웨어 또는 소프트웨어에서 발생할 수 있는 오류를 최소화하고 오류가 발생하였다고 해도 개발 전에 설계상에서 오류를 수정할 수 있어 임베디드 시스템의 신뢰성을 보장하였다. 또한 설계 과정의 어떤 시점에서 개발 중인 가상의 하드웨어가 아닌 개발 완료된 하드웨어의 실제 코드를 테스트할 수 있으므로, 현실적인 임베디드 시스템 개발에 더 효과적인 하드웨어/소프트웨어 통합 개발 방법론을 제시하여 그 효율성을 높였다.

• Journal of the Korean Orthopaedic Association
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• 제52권1호
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• pp.7-14
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• 2017

Purpose: To report the clinical results from surgical treatment for clavicle shaft fracture by percutaneous intramedullary fixation with Steinmann pins. Materials and Methods: Between January 2004 and June 2014, the medical records of 135 patients who underwent percutaneous intramedullary fixation with Steinmann pins were reviewed. The mean follow-up periods were 15 months. The functional results were evaluated with The Disabilities of the Arm, Shoulder and Hand (DASH) score and Constant score. The clinical results were evaluated with the shortened length of the clavicle, length of surgical wound, operation time and Kang's criteria. Results: The mean bone union period was 11.6 weeks (8-16 weeks). The mean DASH score was 11.8. The mean Constant score was 91.2. The mean shortened length of the clavicle was less than 20 mm. The mean length of surgical wound was 1.2 cm (0.7-1.5 cm). The mean operation time was 18 minutes (10-35 minutes). Using Kang's criteria, 131 out of 135 patients (97.0%) showed good results. Complications included were 3 pin migrations and 2 non-unions. Conclusion: Percutaneous intramedullary fixation with Steinmann pins showed good results for treating clavicle shaft fracture.