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유동상 생물막법을 적용한 BNR공법에서의 인제거 영향인자
박운지,김동욱,이찬기 江原大學校 産業技術硏究所 2006 産業技術硏究 Vol.26 No.B
In this study, the use of MBBR(moving bed biofilm reactor) process for Phosphorus Removal efficiency depending on seasons and the factors affecting phosphorus removal efficiency in the process is evaluated. As a result of experiment, T-P removal efficiency has its highest value in winter, (80.8%). and T-P removal efficiency has its lowest value in autumn, (49%). Optimum SRT for Phosphorus Revomal revealed is about 8.8 days and process performs more efficiently as the temperature decreases. It is accepted that nitrate to anaerobic zone is affecting the Phosphorus removal process. With increasing the organic loading rate, Phosphorus removal efficiency also increases. Also, an experiment has been conducted to find out the highest efficiency according to Media existence and it has revealed that Media addition provides better phosphate removal.
박운지,김동욱,안종화,이찬기 江原大學校 産業技術硏究所 2007 産業技術硏究 Vol.27 No.B
We studied runoff characteristics of combined sewer overflows in a city while it was raining. The event mean concentration (EMC) of biochemical oxygen demand (BOD), chemical oxygen demand (COD_(cr)), suspended solids (SS), total nitrogen (TN), and total phosphorus (TP) in one of the combined sewer sites in Chuncheon was 63.5-211.6 mg/L, 114.9-523.8 mg/L, 70.3-436.4 mg/L, 6.4-33.0 mg/L, and 1.09-6.81 mg/L, respectively, In another combined sewer, the EMC of BOD, COD, SS, TN, and TP was 42.1-131.4 mg/L, 107.7-256.5 mg/L, 33.7-221.1 mg/L, 7.9-26.4 mg/L, and 1.16-3.91 mg/L, respectively. The ratio of the cumulative pollutant mass and the cumulative discharged volume determined using all parameters (BOD, COD_(cr), SS, TN, and TP was over 1.0, which shows the first flush effect. Relationships between flow and loadings of BOD, C0D_(cr), SS, TN, and TP were 0.90, 0.89, 0.88, 0.89, 0.92, respectively. Although the size of two areas was almost same, Pollutant concentration and loading were different because of the amount of rainfall, rainfall intensity and basin area.
( Oog-jin Shon ),( Sang-jin Park ),( Bum-jin Shim ),( Dong-yeol Lee ) 대한슬관절학회 2017 대한슬관절학회지 Vol.29 No.4
Purpose: High Outerbridge grade lesions of the articular cartilage have been associated with poor outcomes of high tibial osteotomy (HTO). However, there has been no report on the efficacy of HTO in the presence of kissing lesions. The purpose of this study was to compare clinical and radiographic outcomes of HTO between kissing lesion and non-kissing lesion groups. Materials and Methods: Of the patients with medial compartment osteoarthritis and varus deformity treated with HTO between 2007 and 2012, 21 cases with kissing lesions and 22 cases without kissing lesions were selected. Clinical outcomes were assessed using the Lysholm knee scoring scale score, visual analogue scale score, Hospital for Special Surgery score, Western Ontario and McMaster Universities score, and Tegner activity score. Radiographic outcomes were assessed using the femoral-tibial angle, mechanical axis deviation, medial proximal tibial angle, posterior tibial slope angle, and joint space width. Results: Clinical outcomes were improved in both groups from the postoperative assessment to the final follow-up, which showed no statistically significant difference between groups at the final follow-up. No statistically significant differences were observed with regard to radiographic assessment. Conclusions: Since both groups showed favorable short-term clinical and radiographic outcomes, HTO might be an alternative treatment option for degenerative osteoarthritis with kissing lesions in relatively young patients.
( Oog Jin Sohn ),( Dong Chul Lee ),( Kang Hyun Park ),( Hyo Sae Ahn ) 대한슬관절학회 2014 대한슬관절학회지 Vol.26 No.4
purpose: To compare clinical and radiographic results of anterior cruciate ligament (ACL) reconstruction using modified transtibial technique (mTT), anteromedial (AM) portal technique and outside-in (OI) technique. materials and methods: From March 2007 to December 2012, ACL reconstruction was performed using the mTT, AM portal technique and OI technique in 20 patients each. Anteroposterior and rotational stability were assessed using the GNRB arthrometer and pivot-shift test. Femoral tunnel obliquity was measured on the anteroposterior and lateral radiographs. results: Tegner score, Lysholm score, International Knee Documentation Committee score, pivot-shift test were improved at final follow-up in all three groups. However, statistical difference was not shown. Side-to-side difference in GNRB arthrometer was average of 1.4 mm, 1.0 mm and 0.9 mm in mTT, AM and OI group, showing the signicant difference between mTT and AM/OI groups (p<0.001). The mean femoral tunnel obliquity was 56.4° in the mTT group, 39.4° in the AM group and 33.6° in the OI group, showing significant intergroup difference (p<0.001). It showed the significant difference among three groups (p<0.001). conclusions: Clinical results were improved in all three groups. Femoral tunnel obliquity in AM and OI were more horizontal on the coronal plane. They are thought to have more benefits in oblique positioning of the grafted ACL in rotational stability; however, there was no significant difference among three techniques in pivot-shift test to assess the rotational stability in this study.
( Oog Jin Shon ),( Dong Chul Lee ),( Seung Min Ryu ),( Hyo Sae Ahn ) 대한슬관절학회 2016 대한슬관절학회지 Vol.28 No.2
Purpose: This study is to identify preoperative cautions for revision of infected total knee arthroplasty (TKA) by understanding the differences in hematologic and hemodynamic changes between primary TKA and revision of infected TKA. Materials and Methods: The study included 40 patients in each of the two groups: one group with patients who underwent TKA and the other group with patients who underwent revision of infected TKA. All patients matched for age and body mass index. The following data were compared between the groups: changes in blood pressure, variations in hemoglobin level, amount of postoperative blood loss and transfused blood, incidence of blood transfusion, white blood cell (WBC) count, albumin level, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), and liver enzyme level. Results: The hemoglobin levels, transfusion rate, and the amount of blood loss were significantly higher in the revision group (p=0.012). In both groups, CRP reached the highest level on the 3rd postoperative day but it was normalized 2 weeks postoperatively; however, the revision TKA group showed a greater tendency to normalization (p=0.029). There were significant differences between the groups in ESR, WBC, blood pressure, and changes in liver enzyme levels. Conclusions: Revision of infected TKA results in greater hemodynamic variations than primary TKA. Therefore, more efforts should be made to identify pre- and postoperative hemodynamic changes and hematologic status.
Femoral Double Tunnel 및 Tibial Inlay 법을 이용한 후방십자인대 재건술 후 평가
이동철(Dong Chul Lee),손욱진(Oog Jin Sohn),장우혁(Woo Hyuk Jang),배상근(Sang Keun Bae) 대한정형외과학회 2006 대한정형외과학회지 Vol.41 No.4
목적: 이중 대퇴 터널 및 경골 inlay 방법을 사용해 후방십자인대 재건술 후 이 재건술의 임상적 유용성을 알아보고자 하였다. 대상 및 방법: 2001년 1월부터 2002년 8월까지 이중 대퇴 터널 및 경골 inlay 방법으로 후방십자인대 재건술을 실시한 환자 중 21개월 이상 추시 관찰 가능한 21예를 대상으로 하였으며 평균 연령은 37 (16-60)세였다. 기능평가 및 활동정도는 기능도와 활동도를 이용하였고 후방 전위 스트레스 방사선 사진 및 Telos 기구 등을 이용하여 안정도를 평가하였다. 결과: 술 전 기능도, 활동도는 후방십자인대 단독 손상군에서는 각각 46.0점, 2.3점에서 술 후 94.0점, 5.3점으로 향상되었고 후외측인대 동반 손상군에서는 술 전 40.6점, 1.5점에서 술 후 77.1점, 3.5점으로 향상되었다. 후방전위등급은 술 전 Ⅱ등급 2예 Ⅲ등급 13예, Ⅳ등급 6예로 평균 14.6 ㎜의 후방전위를 보였으나 술후 Ⅰ등급 18예, Ⅱ등급 3예로 평균 후방전위는 2.9 mm로 향상되었다. 술 후 Telos 기구(15 kg)를 이용한 후방 전위 스트레스 사진 상 30° 및 90° 굴곡 시 각각의 후방전위의 차이는 없었다. 술 후 합병증으로 굴곡 장애 3예, 신전 장애 1예였다. 결론: 후방십자인대 재건술에서 이중 대퇴 터널 및 경골 inlay 방법을 이용한 후방십자인대 재건술은 후방십자인대의 전외측 가닥과 후내측 가닥을 재건해 만족할 만한 슬기능, 안정도 및 활동도를 보였으나 장기 추시관찰을 요하며 특히 단일 대퇴 터널 재건술과의 장기 추시 비교가 필요할 것으로 사료된다. Purpose : This study was performed to evaluate the clinical usefulness of femoral double tunnel PCL reconstruction using the tibial inlay technique. Materials and Methods : From January 2001 to August 2002, 21 patients underwent femoral double tunnel PCL reconstruction using the tibial inlay technique and were followed for more than 21 months. The mean age was 37 years old (range 16 to 60 years old). The clinical results were evaluated with the Lysholm score and the Tegner activity score. Radiologic analysis was performed using the posterior stress and Telos stress views. Results : The average preoperative Lysholm and Tegner activity scores were 46.0 and 2.3, respectively, and improved to 94.5 and 5.3, respectively, at the final follow-up. The average preoperative scores of the combined posterolateral ligament injury group was 40.6 and 1.5, which improved to 77.1 and 3.5 at the final follow-up. Preoperatively, two cases were grade Ⅱ, 13 cases were grade Ⅲ, 6 cases were grade Ⅳ, and posterior translation was an average of 14.6 ㎜. Postoperatively, 18 cases were grade Ⅰ, 3 cases were grade Ⅱ, and posterior translation was an average 2.9 ㎜. In a push view using the Telos device (15 ㎏) at 30o and 90o of knee flexion, there were no differences in posterior translation. Complications were limitation of flexion (3 cases), limitation of extension (1 case) and quadriceps atrophy (mean, 2.6 ㎝). Conclusion : It is suggested that femoral double tunnel PCL reconstruction with the tibial inlay technique using anterolateral and posteromedial bundles is an effective technique for the restoration of knee function, stability, and activity. However long-term evaluation of patients and comparisons with femoral single tunnel reconstruction are required to confirm the effectiveness of this procedure.
관절경하 후방십자인대 재건술 시 전내측 경골 터널과 전외측 경골 터널을 통한 접근방법의 차이에 따른 임상적, 방사선학적 결과 비교
이동철(Dong-Chul Lee),손욱진(Oog-Jin Shon),박철현(Chul-Hyun Park),고영진(Young-Jin Ko) 대한정형외과학회 2011 대한정형외과학회지 Vol.46 No.5
목적: 관절경하 후방십자인대 재건술에 있어서 전내측 경골 터널과 전외측 경골 터널을 이용한 술식의 차이에 따른 임상적, 방사선학적 결과를 비교 분석하고자 하였다. 대상 및 방법: 2004년 1월부터 2007년 12월까지 후방십자인대 단독 손상으로 후방십자인대 재건술을 받고 최소 1년 6개월 이상의 추시가 가능하였던 환자군 40예(전내측 20예, 전외측 20예)를 대상으로 하였다. Lysholm score와 Tegner acitivity score, single leg hop test를 통해 기능도와 활동도, IKDC score를 통해 주관적 만족도를 평가하였다. Manual 및 Telos 기구를 통한 후방 전위 검사를 통해 결과를 비교 분석하였으며, 슬관절 전후방 사진상 경골 터널의 직경 변화를 측정하여 확장 정도를 비교하였다. 결과: Lysholm score는 전내측군이 55.2에서 88.1점으로, 전외측군이 52.3에서 89.5점으로 호전되었다. Tegner score는 전내측군인 2.5에서 5.5점, 전외측군이 2.2에서 5.9점으로 호전을 보였으며, single leg hop test에서도 모두 향상된 결과를 보였다. IKDC score는 양군 모두 nearly normal 이상이 85%로 조사되었다. 후방 전위 검사에서 양군 모두 향상된 결과를 보였으며, 경골 터널 확장 검사에서 양군 모두 확장된 결과를 보였다. 양군을 비교하였을 때 통계학적으로 유의한 차이는 보이지 않았다. 결론: 후방십자인대 재건술을 받는 양환자군의 단기 추시상 임상적, 방사선학적 결과 및 주관적 만족도에서 의미있는 차이는 보이지 않았으나, 장기적인 추시를 통한 비교가 필요할 것으로 사료된다. Purpose: The purpose of this clinical study was to compare the outcomes of anteromedial and anterolateral trans-tibial approachs in arthroscopic PCL reconstruction. Materials and Methods: Between January 2004 and December 2007, 40 patients (40 knees, which underwent PCL reconstruction, with a follow-up of more than 1.6 years) were surveyed in the areas of clinical and radiographic results and individual satisfaction. Forty knees with isolated PCL rupture were reviewed retrospectively. They were divided into two groups of equal size according to the transtibial approach used: anteromedial or anterolateral. The evaluation parameters included activities and functional outcomes using the Lysholm and Tegner score, single leg hop test and ind ividual satisfaction using the IKDC score. Radiographic results were analyzed using the posterior drawer rad iography with manual methods and the Telos device, and the changes in the tibial tunnel diameter were measured. Results: Both groups showed improvements in the Lysholm and Tegner score. Both groups showed improvements in the single leg hop test. As far as individual satisfaction evaluation using the IKDC score was concerned, 85% of cases in both groups improved to nearly normal. Both groups showed improvements on the posterior drawer radiography. Tibial tunnel enlargement was also seen. The results of both groups demonstrated no statistically significant difference. Conclusion: Both groups showed improvements in the clinical and radiographic results and in the individual satisfaction score. However, results of both groups demonstrated no statistically significant difference. Therefore, the long term results need to be studied.