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자가 슬개건과 동종 슬개건을 이용한 전십자인대의 재건의 비교
변기용,이광진,신현대,이원석,Byun Ki-Yong,Rhee Kwang-Jin,Shin Hyun-Dae,Lee Won-Sok 대한관절경학회 1997 대한관절경학회지 Vol.1 No.1
We have studied the results of reconstruction by freeze-dried patellar allografts or patellar autografts in ACL-deficient patients prospectively. From January 1995 to December 1995, we performed ACL reconstruction using an arthroscopic-assisted technique with patellar autografts in 21 patients and patellar allografts in 13 patients. Minimum followup time was 1 year(average 26 months). All patients were evaluated by using KT-2000 arthrometer and MRI as well as by physical examination. Final results were rated as satisfactory or unsatisfactory by using a modified Feagin knee scoring scale. Good or excellent were considered to have satisfactory results and fair or poor were considered to have unsatisfactory results. As measured by the KT-2000, 19 cases$(90.5\%)$ had a 5-mm or Jess side-to-side differential, a satisfactory results in autograft group, 2 cases of unsatisfactory results had joint instability. In allograft group, 10 cases$(76.9\%)$ had a 5-mm or less side-to-side differential, a satisfactory results, 3 cases of unsatisfactory results had joint instability including postoperative infection(1 case). In conclusion, the results of ACL reconstruction with autografts were better than those with allografts. The problem of allograft reconstruction were rehydration, aseptic control and improper mechanical tensioning. So, we thought that success of allograft reconstruction was depended on careful implant preparation including pretensioning technique.
딥러닝을 이용한 시퀀스 기반의 여행경로 추천시스템 : 제주도 사례
이희준(Hee Jun Lee),이원석(Won Sok Lee),최인혁(In Hyeok Choi),이충권(Choong Kwon Lee) 한국스마트미디어학회 2020 스마트미디어저널 Vol.9 No.1
딥 러닝의 발전에 따라 추천시스템에서 딥 러닝 기반의 인공신경망을 활용한 연구가 활발히 진행되고 있다. 특히, RNN(Recurrent Neural Network)기반의 추천시스템은 데이터의 순차적 특성을 고려하기 때문에 추천시스템에서 좋은 성과를 보여주고 있다. 본 연구는 RNN기반의 알고리즘인 GRU(Gated Recurrent Unit)와 세션 기반 병렬 미니배치(Session Parallel mini-batch)기법을 활용한 여행경로 추천 시스템을 제안한다. 본 연구는 top1과 bpr(Bayesian personalized ranking) 오차함수의 앙상블을 통해 추천 성과를 향상시켰다. 또한, 데이터 내에 순차적인 특성을 고려한 RNN기반 추천 시스템은 여행경로에 내재된 여행지의 의미가 반영된 추천이 이루어진다는 것을 확인되었다. With the development of deep learning, studies using artificial neural networks based on deep learning in recommendation systems are being actively conducted. Especially, the recommendation system based on RNN (Recurrent Neural Network) shows good performance because it considers the sequential characteristics of data. This study proposes a travel route recommendation system using GRU(Gated Recurrent Unit) and Session-based Parallel Mini-batch which are RNN-based algorithm. This study improved the recommendation performance through an ensemble of top1 and bpr(Bayesian personalized ranking) error functions. In addition, it was confirmed that the RNN-based recommendation system considering the sequential characteristics in the data makes a recommendation reflecting the meaning of the travel destination inherent in the travel route.
황득수 ( Deuk Soo Hwang ),윤승호 ( Seung Ho Yune ),권순태 ( Soon Tae Kwon ),이원석 ( Won Sok Lee ),송재기 ( Jae Gie Song ) 대한고관절학회 1997 Hip and Pelvis Vol.9 No.1
From March 1995 to October 1996, We performed arthroscopy of the hips in symptomatic nine patients under the impression of acetabular labrum tear. Preoperatively, the acetabular labrum tear was diagnosed in thirteen patients with careful physical examinations and MR arthrography and four patients with acetabular dysplasia were excluded from the study. Among nine patients, eight cases were men and seven cases were the fifth and sixth decade. Three cases were associated with trauma history. Superoanterior labrum tear was most common in arthroscopic findings(44.4%). The MR Arthrogram showed 88.9% sensitivity and 77.8% accuracy compared with arthroscopic findings for the acetabular labrum tears. The stage ]@l A was more common than other types(60.0%). All patients except two were improved by the diagnosis and treatment of an acetabular labrum tear(77.8%). Six patients were treated with arthroscopic debridement and open resection and three patients treated arthroscopically. So, we encouraged arthroscopy of the hip to confirm the diagnosis and treatment of the acetabular labrum tear.