뉴토니안 대응점도를 이용한 Maddock mixing head의 해석

이기윤,민영경 忠南大學校 産業技術硏究所 1993 산업기술연구논문집 Vol.8 No.2

A theoretical and experimental study was conducted on the performance of the Maddock mixing head (abbreviation:MMH) in plasticating single-screw extrusion. For the theorectical study, the flow analysis network(FAN) method with the corresponding viscosity, so called, the equivalent Newtonian viscosity was used for the prediction of pressure variation in both the down-channel and cross-channel direction of MMH. And for the experimental study a low-density polyethylene was extruded in an extruder that had nine pressure transducers mounted almost equally spaced along the extruder axis, on the wall of the extruder barrel. Two screw with the MMH were used, namely: one screw to measure the pressure difference between the entrance and the exit of the mixing head in the down-channel direction and the other screw to measure pressure variations in the cross-channel direction in the middle of the mixing head. Our experimental results showed both pressure decrease and pressure increase in the down-channel direction of the mixing head depending upon the extrusion conditions employed. The experimental results successfully agreed with the theoretical predictions.

MRI의 축상면에서 관절와 중심과 상완골두 중심의 편향 정도에 대한 측정

민영경(Young-Kyoung Min),김정한(Jung-Han Kim),곽희철(Hee-Chul Gwak),김창완(Chang-Wan Kim) 대한견주관절의학회 2018 대한견주관절학회 학술대회논문집 Vol.2018 No.3

일차성 요근 농양의 임상양상 및 경과, 진단, 치료

안기찬,김창완,민영경 대한척추외과학회 2010 대한척추외과학회지 Vol.17 No.4

연구계획: 일차성 요근 농양 환자에 임상경과에 대한 후향적 연구목적: 일차성 요근 농양으로 처음 진단된 환자군을 대상으로 그 원인 및 치료결과에 대하여 조사 하였다. 선행문헌의 요약: 일차성 요근농양은 드문 질환이며, 진단 및 치료가 늦어지면 치명적인 결과를 초래하는 질환이다. 대상 및 방법: 2003년 10월부터 2010년 2월까지 본원에서 일차성 요근 농양으로 진단된 17례(남자 11명, 여자 6명)를 대상으로 하였다. 증상 및 동정된균주, 동반 질환, 치료 등을 조사하였다. 치료 방법에 따라 1군은 항생제 단독 치료군, 2군은 경피적 도관 삽일술 시행군, 3군은 수술적 배농술 시행군으로 분류하였으며 각 군간의 농양의 크기 차이는 Kruskall Wallis 검정을 이용하여 분석하였다. 결과: 가장 많이 호소하는 증상으로는 동통(하부요통 형태, 14명)이었으며, 동정된 균주로는 황색포도상구균(12명)이 가장 많았다. 모든 환자에 있어서 광범위 항생제 치료를 시행하였으며, 1군은 4명으로 평균 농양의 크기는 2.3cm (1.2~4.5cm)이었으며, 2군은 7명으로 평균 농양의 크기는 7.4cm (3.8~12.2cm), 3군은 6명으로 평균 농양의 크기는 8.1cm(6.1~14.7cm)이었다. Kruskall Wallis 검정 결과 P = 0.007으로 각 군간 농양의 크기는 유의한 차이가 있었다. 결론: 일차성 요근 농양으로 진단된 환자들은 하부요통, 발열감 및 위장관 증상 등을 호소 하였으며, 황색포도상구균 등에 의한 화농성 감염이 대부분이었다. 일차성 요근 농양이 의심되면 조기에 경험적 항생제 등을 이용한 치료가 이루어져야 하며, 농양의 크기 및 항생제 치료의 반응 여부에 따라 경피적 도관 삽입술이나 개방적 배농술 등을 고려해 볼 수 있겠다. Study Design: This is a retrospective study on the clinical availability, diagnosis and treatment of primary psoas muscle abscess Objectives: This study investigated the causes and clinical results of patients with primary psoas muscle abscess. Summary of Literature Review: Primary psoas muscle abscess is not a common disease clinically, but it is a very dangerous disease if the diagnosis and treatment are delayed. Materials and Methods: Between October 2003 and February 2010, we investigated the symptoms, pathogens, the associated diseases and treatments of 17 patients (11 males and 6 females; mean age: 49.5 years old). We divided patients into the 3 groups According to the treatment options (Group 1: antibiotics alone, Group 2: percutaneous catheter drainage, Group 3: open drainage) and the correlation of the abscess size of each group was analyzed by the Kruskall Wallis method. Results: The most common complaint was lower back pain (14 patients). Staphylococcus aureus was the most common infectious organism (12 patients). All the patients were treated with broad spectrum antibiotics. Group 1 was composed of 4 patients and the average size of the abscess was 2.3cm (range: 1.2~4.5cm). Group 2 was composed of 7 patients and the average size of the abscess was 7.4cm (range: 3.8~12.2cm). Group 3 was composed of 6 patients and the average size of the abscess was 8.1cm (range: 6.1~14.7cm). There was a significant correlation of the abscess size between each group. (p=0.0007)Conclusions: The patients diagnosed with primary psoas muscle abscess complained about lower back pain, a febrile sense and gastrointestinal symptoms. Most of the primary psoas muscle abscesses are pyogenic infections. We have to use broad-spectrum antibiotics for the initial treatment. When the occasion demands, additional treatment like percutaneous catheter drainage and open drainage should be considered.

Clinical Results Associated with Changes of Posterior Tibial Slope in Total Knee Arthroplasty

서승석,김창완,김정한,민영경 대한슬관절학회 2013 대한슬관절학회지 Vol.25 No.1

Purpose: The purpose of this retrospective study is to investigate the effect of posterior tibial slope (PTS) on clinical results in total knee replacement arthroplasty (TKA). Materials and Methods: We analyzed 801 knees in 768 patients who underwent TKA using a cruciate-retaining prosthesis for osteoarthritis from July 2003 to July 2009. PTS was measured on simple X-ray films and patients were divided into 5 groups, according to the change in PTS that was calculated by subtracting the preoperative from the postoperative PTS: group 1, >3o; group 2, 3o to 1o; group 3, 1o to -1o; group 4, -1o to -3o; and group 5, <-3o. We analyzed the correlations between the change in PTS and clinical results, such as Knee Society knee score, Knee Society functional score, Feller patella score, Kujala score, visual analog scale score, range of motion, and complications. Results: There was no statistically significant intergroup difference; however, Feller patella score and Kujala score were significantly different in groups 2 and 3. There were no complications, such as progressive loosening of implants, fractures of polyethylene inserts and wears. Conclusions: Clinically meaningful improvement was observed in all patients after TKA. Groups 2 and 3 (3o to -1o) showed significant improvement compared to the other groups.

봉합 불가능한 회전근개 파열 환자에 대한 관절경하 상관절막 재건술 시행 후 해부학적 및 임상적 결과에 영향을 미치는 인자 분석

이승준(Seung-Jun Lee),민영경(young-kyoung Min) 대한견주관절의학회 2018 대한견주관절학회 학술대회논문집 Vol.2018 No.3

설명 가능한 딥러닝을 활용한 CT 영상에서의 골밀도 예측

강정운(Jeong-Woon Kang),박춘수(ChunSu Park),유재흥(Jae-Heung Yu),민영경(Yeong-Kyeong Min),김민우(MinWoo Kim) 한국정보과학회 2022 한국정보과학회 학술발표논문집 Vol.2022 No.06

전방십자인대 파열에 있어 대퇴과간 절흔 폭과 후방 경골 경사각의 임상적 의의

서승석 ( Seung Suk Seo ),김창완 ( Chang Wan Kim ),김경환 ( Kyung Whan Kim ),민영경 ( Young Kyoung Min ) 대한슬관절학회 2010 대한슬관절학회지 Vol.22 No.3

목적: 대퇴과간 절흔 폭과 후방 경골 경사각이 전방십자인대 파열 및 파열 위치에 미치는 영향에 대하여 알아보고자 하였다. 대상 및 방법: 2002년 2월부터 2009년 7월 사이에 본원에서 전방십자인대 파열로 치료받은 환자 105예 (105명) 및 대조군으로 전방십자인대 비파열군 91예(91명)에 대하여 단순 방사선 사진을 이용하여 대퇴 과간 절흔 폭과 후방 경골 경사각을 측정하였다. 또한 전방십자 인대의 파열 위치에 따라서 대퇴골 부착부위, 중간부위, 경골부착부위 파열군으로 분류하여 각 군에서의 상관관계를 분석하였다. 결과: 대퇴과간 절흔 폭의 평균은 전방십자인대 파열군 15.51±4.30 mm (95% confidence interval: 15.48∼15.53), 비파열군 24.49±3.86 mm (24.47∼24.52)이었으며, 후방 경골 경사각은 파열군 평균 7.68±3.78o (7.65∼7.70), 비파열군 6.12±3.85o (6.10∼6.13)이며, 대퇴과간 절흔 폭과 전방십자인대 파열 사이에는 연관성이 있었다(교차비=0.661 [0.602∼0.720], p<0.01). 후방 경골 경사각과는 연관성이 없었다(교차비=1.073 [1.062∼1.134], p=0.197). 파열 위치에 따른 분산분석에서는 통계학적으로 의미있는 결과를 관찰 할 수는 없었다. 결론: 전방십자인대 파열에 있어서 대퇴과간 절흔 폭의 감소는 의미있는 위험 요소임을 알 수 있었다. Purpose: The purpose of this study was to evaluate the relationship between the femoral intercondylar notch width (ICW), the posterior tibial slope angle (PTS), rupture of the anterior cruciate ligament (ACL) and the ruptured site. Materials and Methods: We retrospectively reviewed 105 cases of ruptured ACL (105 patients), and 91 cases of intact ACL (91 patients). The ICW and PTS were measured from the plain knee radiographs. The ratio of the ICW and the femoral intercondylar notch height (ICH) was also measured. As for the site of ACL rupture, the patients with a ruptured ACL were divided into 3 groups (group 1: femoral attach site, 2: mid-substance, 3: tibial attach site), and the correlations between the ICW and the PTS of each group were analyzed. Results: The mean ICW of the ACL ruptured group was 15.51±4.30 mm (95% confidence interval: 15.48∼ 15.53), that of the ACL intact group was 24.49±3.86 mm (24.47∼24.52), and the mean PTS of the ruptured ACL group was 7.68±3.78o (7.65∼7.70) and that of the intact ACL group was 6.12±3.85o (6.10∼6.13). A narrow ICW was a significant risk factors for ACL rupture (odds ratio=0.661 [0.602∼0.720], p<0.01). But we did not get any statistically significant results for the increase PTS (odds ratio=1.073 [1.062∼1.134], p=0.197). According to the ruptured site, the analysis of variance of the ICW and PTS had no significant correlation. Conclusion: A narrow ICW is a significant risk factor for ACL rupture.

인공 고관절 전치환술에서 관절 주위 다중약물투여를 이용한 통증조절

최장석 ( Jang Seok Choi ),김정한 ( Jung Han Kim ),곽희철 ( Heui Chul Gwak ),김정원 ( Jung Won Kim ),민영경 ( Young Kyoung Min ) 대한고관절학회 2010 Hip and Pelvis Vol.22 No.4

Purpose: This study attempted to evaluate the pattern of change of the pain after total hip arthroplasty (THA) and to confirm the effect of periarticular multimodal drug injection (PMDI) on controlling the early postoperative pain. Materials and Methods: Of the total patients who underwent primary THA at our hospital because of osteonecrosis of the femoral head from March to October 2008, 60 patients were enrolled in this study. The subjects were divided into three groups. Groups 1 & 2 received periarticular injection. Group 1 included the patients who were injected with a combination of opioid, long-acting local anesthetics, a non-steroidal anti-inflammatory drug and epinephrine. Group 2 received a combination of morphine and ropivacaine and group 3 was not injected with any analgesics. The visual analogue scale (VAS) at 4 hours, 8 hours, 12 hours, 24 hours, 2 days, 3 days, 5 days, 14 days and 1 month after surgery, the frequency that patients pushed the self-controlled pain medication machine for 2 days after surgery and the amount of clonac that was injected according to the needs of the patients were used as objective measures. Results: The VAS score at postoperative 4 hours to 3 days among the groups showed a significant difference (P<0.05), but the VAS scores at postoperative 5 days to 1 month among the groups showed no significant difference (P>0.05). The frequency of pushing the self-controlled pain medication machine among the groups and the amount of clonac according to the needs of the patients among the groups showed that there were significant decreases at the operation day, the postoperative 1, 2 day and the 3 days (P<0.05). Conclusion: PMDI has a significant effect on controlling the early postoperative pain after THA.