줄 히팅을 이용한 아스팔트패드 간접가열에 있어서 통전시간별 융착성 평가

배기만(Ki-Man Bae),최한석(Han-Suk Choi),오보라미(Bo-Ra-Mi Oh),백종진(Jong-Jin Baek),박성환(Seong-Hwan Park),강명창(Myungchang Kang),이재진(Jae-Jin Lee) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.8

Recently, vibration and noise have become an important issue in the auto industry. Asphalt vibration damping pads are used to reduce the noise and vibration of automobile bodies, and asphalt is used for many mass-produced parts due to its simple attachment process and low processing costs. In this study, the self-adhesion of asphalt pads using Joule heating was evaluated. To create the asphalt pad for the experiment, the asphalt pad was molded into a specific thickness by using SGACC material and rubber used in the vehicle body as a main component and a modified resin and filler. The SGACC material was 200 mm in length, 200 mm in width, and 0.7 mm in thickness. The asphalt pad was 200 mm in length, 100 mm in width, and 3 mm in thickness. The equipment was composed of a TR (Transformer) DC254kVA and a TC (Time controller) for a current of up to 20,000 A. The current for the Joule heating was set to 7.0 kA and a 3/1 cycle, for which the adhesion of the asphalt pad over the current flow time was evaluated.

전방십자인대 재건술 시 이식건의 선택과 고정

김두한(Du-Han Kim),배기철(Ki-Cheor Bae),최병찬(Byung-Chan Choi) 대한정형외과학회 2020 대한정형외과학회지 Vol.55 No.4

전방십자인대 재건술은 수술의 시기, 수술 기법, 이식건의 선택 및 고정 방법, 재활 등 각각의 수술 과정을 성공적으로 수행해야하는 수술이다. 여러 과정들 중에서 이식건의 선택과 고정 방법은 아주 중요한 과정 중에 하나이지만 아직 술자들 간에 많은 논쟁의 여지가 있다. 이식건의 장단점에 관해 많은 연구들이 진행되고 있지만 여전히 이상적인 건에 대한 결론은 없다. 이와 유사하게 대퇴터널 및 경골터널 고정 방법에 대해서도 최근 많은 방법들이 개발되고 소개되고 있지만 그중에서 가장 좋은 방법을 찾지 못한 상태이다. 그래서 술자는 다양한 이식건과 고정 방법에 대하여 익숙해져야 하며 각각의 방법에 대한 장단점을 잘 알고 있어야 할 것이다. 따라서 본 종설은 전방십자인대 손상에서 이식건의 선택과 고정 방법에 대하여 지금까지 밝혀진 연구들을 분석하고 이에 관해 논의하고자 한다. Anterior cruciate ligament (ACL) reconstruction is a successful procedure independently by patient selection, timing of surgery, surgical technique, choice of graft, and fixation methods. Among these factors, graft selection and fixation methods might be the most critical yet controversial questions for surgeons. Although recent studies showed that grafts have advantages and drawbacks, there is still no ideal graft. Similarly, many fixation methods of femoral and tibial tunnels have been proposed over the last few decades, with no clear superiority of one technique over another. Surgeons should be familiar with a variety of grafts, fixation techniques, and their specific associated surgical procedures as well as the advantages and disadvantages of each. Therefore, this article summarizes the current literature and discusses the current state of graft selection and fixation methods in the treatment of an ACL injury.

수동 및 전동 킥보드 손상 유형에 대한 분석: 단일 3차 병원 응급실 내원 환자 후향적 분석

김두한 ( Du-han Kim ),배기철 ( Ki-cheor Bae ),김범수 ( Beom-soo Kim ),김지훈 ( Ji-hoon Kim ),최병찬 ( Byung-chan Choi ),조철현 ( Chul-hyun Cho ) 대한스포츠의학회 2021 대한스포츠의학회지 Vol.39 No.4

Purpose: Recently, there has been an increasing number of kickboard injuries at our orthopedic clinic and emergency room. Therefore, this study is to identify the incidence and characteristics of nonmotorized and electric kickboard injuries with emergency room surveillance. Methods: Between August 2018 and January 2021, patients who visited the emergency room of a tertiary hospital with nonmotorized and electric kickboard injuries were included. The incidence, severity, and characteristics were analyzed. Results: There were a total of 204 patients who visited our emergency room during the study period. There were 139 nonmotorized kickboard injuries with 115 minor, 11 moderate, and 13 severe injuries. Fifty-six electric kickboard injuries were 47 minor, one moderate, and eight severe injuries. The incidence of injury depended on-site and was as follows: face and head (63.7%), upper extremity, lower extremity, abdomen and chest, and spine. Conclusion: Face and head injuries were the most common injuries in body part, while minor trauma was the most common diagnosis. With the increasing incidence of kickboard injuries, we should be more mindful that protective equipment and safety rules may be necessary.

내측 반월상 연골판 후방 부착부 파열의 관절경적 견인 봉합술 - 최소 5년 추시결과 -

사공협,신홍관,이영국,배기철,조철현,이경재,손은석,김두한,SaKong, Hyub,Shin, Hong Kwan,Lee, Young-Kook,Bae, Ki Cheor,Cho, Chul Hyun,Lee, Kyung Jae,Son, Eun-Seok,Kim, Doo Han 대한관절경학회 2012 대한관절경학회지 Vol.16 No.2

목적: 본 연구의 목적은 슬관절 내측 반월상 연골판 후방 부착부 파열 환자에 대해 관절경적 견인 봉합술을 시행한 후 임상적 및 방사선학적 5년 추시 결과를 보고하고자 한다. 대상 및 방법: 2001년 1월부터 2005년 5월까지 본원에서 내측 반월상 연골판 후방 부착부 파열로 진단받고 관절경적 견인 봉합술을 시행한 환자 중 5년 이상 추적 관찰이 가능하였던 30예를 대상으로 하였다. 평균 추시 기간은 76개월(60-90개월)이었다. 임상적 결과는 Lysholm knee score로 확인하였고 방사선학적 결과는 단순 방사선 사진을 이용한 Kellgren-Lawrence 분류를 이용하였으며, 전예에서 2차 관절경 수술을 시행하였다. 외상, 비만, 내반 변형 및 수술 시기 등과 임상적 결과를 비교 분석하였다. 결과: 임상적 결과는 수술 전 Lysholm knee score 평균 55점에서 5년 추시 시 평균 86점으로 호전을 보였고, 방사선학적 추시 검사 결과 23예에서 관절 간격의 유지 및 호전 소견 보였으며, 7예에서 관절 간격이 감소되는 등의 퇴행성 변화가 있었고, 그 중 1예에서 골 관절염의 진행 소견으로 추후 인공 관절 치환술을 시행하였다. 결론: 관절경적 견인 봉합술을 시행하여 최소 5년 추시에서 27예(90%)에서 양호 이상의 좋은 결과를 얻었으며 내반 각도가 클수록 임상적으로 호전되는 정도는 유의하게 낮았다. Purpose: This study aims at evaluating our results with a 5-year follow up of arthroscopic pull-out suture repair of posterior root tear of the medial meniscus. Materials and Methods: This study enrolled 30 cases who underwent a arthroscopic pull-out suture repair to treat the posterior root tear of the medial meniscus from January 2001 to May 2005 and followed up at least 5 years. The average follow-up period was 76 months (range, 60-90 months). Clinical results by use of the Lysholm knee score and radiographic grade by use of the Kellgren-Lawrence classification were evaluated and second-look arthroscopy was done in all cases. The clinical results were compared with trauma history, obesity, varus deformity and time to operation. Results: At the last follow up, the Lysholm knee score improved from 55 points to 86 points. For the radiological results, 23 cases displayed maintenance or improvement of the medial joint space on the follow up X-ray, but 7 cases displayed decrease of the medial joint space, and 1 case was lately performed total knee replacement due to progressive osteoarthritic change. Conclusion: Arthroscopic pull-out suture repair has a good result at 27 cases (90%) in minimum 5 years follow-up. The clinical improvement was significantly reduced in more severe varus angle.

골결손을 동반한 경골골절에서 금속정 고정 및 자가골 이식을 이용한 치료

사공협 ( Hyub Sakong ),배기철 ( Ki Cheor Bae ),조철현 ( Chul Hyun Cho ),이경재 ( Kyung Jae Lee ),손은석 ( Eun Seok Son ),김두한 ( Du Han Kim ) 대한골절학회 2012 대한골절학회지 Vol.25 No.4

목 적: 경골골절에 발생한 골결손에 대해 금속정 고정술 및 자가장골 이식술을 시행하고 결과를 평가하였다. 대상 및 방법: 2005년 5월부터 2008년 9월까지 경골 골결손에 대해 금속정 고정술 및 자가장골 이식술을 시행 받았던 환자 중 1년이상 추시가 가능하였던 10예를 대상으로 하였다. 남자가 8예, 여자가 2예였으며 평균연령은 50.2세(29∼76세)였다. 사고 원인은 교통사고 9예, 추락사고 1예였으며 평균 추시기간은 21.9개월(12∼42개월)이었다. 방사선학적 결과는 결손 부위의 유합 유무로 판단하였고 임상적 결과는 Mekhali의 평가법으로 분석하였다. 결 과: 전 예에서 골유합을 보였으며 평균 골유합 기간은 8.4개월(5∼18개월)이었다. Mekhali의 평가법상 9예에서 우수(excellent)의 결과를 보였고 1예에서 족관절에 운동장애가 있어 보통(fair)의 결과를 보였다. 수술적 처치로 인한 합병증은 관찰되지 않았다. 결 론: 경골골절에 발생한 골결손 치료에 있어 금속정 고정 및 자가장골 이식술은 외고정장치를 일찍 제거할 수 있어 합병증을 줄일 수 있으며 골전도 및 골유도, 골형성 능력이 뛰어난 자가골을 이식함으로써 우수한 골유합을 얻을 수 있다는 장점이 있어 유용한 술기로 생각한다. Purpose: This study was conducted to evaluate the results of intramedullary nail fixation with autogenous iliac bone graft for defects of bone after tibial fractures. Materials and Methods: Ten patients with bone defects in tibial fractures who had been treated with intramedullary nail fixation with autogenous iliac bone graft between May 2005 and September 2008 with more than 12 month follow-up were subject to study. Of the 10 patients, 8 were male and 2 were female, and the mean age was 50.2 years (29∼76 years). By cause of accident, motor vehicle accidents caused 9 cases, a crush caused 1 case, and the average follow-up period was 21.9 months (12∼42 months). Radiologically, we analyzed the union of the bone defect on simple x-ray and clinical evaluation was performed using the estimate method of Mekhali. Results: This study reveals that there was radiological union in all 10 cases and the mean time to union was 8.4 months (5∼18 months). By clinical evaluation according to Mekhali`s estimate method, 9 patients had excellent outcomes and 1 patient had limitation of motion in the ankle joint rated as a fair clinical result. None of patients developed complications post-operatively. Conclusion: Our study demonstrated that the intramedullary nail fixation with autogenous iliac bone graft can be a useful operative method because it can remove external fixators early and reduce complications, and autogenous bones have exceptional osteoconduction, osteoinduction, and bone-forming ability resulting in excellent union of bones.

직장암에서 복강경 수술과 개복 수술 후 단기간의 종양학적 결과에 대한 비교

최낙준(Nak Jun Choi),유종한(Jong Han Yoo),이홍태(Hong Tae Lee),신재호(Jae Ho Shin),박하경(Ha Kyoung Park),안민성(Min Sung An),하태권(Tae Kwun Ha),김광희(Kwang Hee Kim),배기범(Ki Beom Bae),김태현(Tae Hyun Kim),최창수(Chang Soo Choi),오 대한종양외과학회 2013 Korean Journal of Clinical Oncology Vol.9 No.1

Purpose: The aim of this study was to assess the impact of laparoscopic vs. conventional open surgery for rectal cancer on clinical and oncologic outcome in a multi-modal setting. Methods: In total, 940 patients who underwent conventional open surgery between February 1995 and October 2007, and 311 patients who underwent laparoscopic surgery between December 2006 and May 2011 were enrolled retrospectively. Oncologic outcomes included 3-year overall survival (OS) and disease free survival, factors affecting them, and risk factors for local and systemic recurrence. Results: No difference was found between laparoscopic surgery and conventional open surgery in terms of OS, disease free survival rate at stages I and II, but the 3-year OS for stage III was different between the groups (70.26% for conventional open surgery vs. 90.14% for laparoscopic surgery; P=0.0002). The 3-year disease free survival rate for stage III was 56.59% for conventional open surgery vs. 56.65% for laparoscopic surgery (P=0.6578). The local recurrence rates were 6.81% vs. 8.47% (conventional open surgery vs. laparoscopic surgery; P=0.4960). The systemic recurrence rates were 15.64% vs. 15.71% (conventional open surgery vs. laparoscopic surgery; P=0.9713). Conclusion: Laparoscopic surgery for rectal cancer showed a similar short-term oncologic outcome to conventional open surgery. This suggests that laparoscopic surgery is an acceptable alternative to conventional open surgery for selected patients with rectal cancer.

폐압축보드를 이용한 바이오에탄올 생산

강양래(Yang-Rae Kang),황진식(Jin-Sik Hwang),배기한(Ki-Han Bae),조훈호(Hoon-Ho Cho),이은정(Eun-Jeong Lee),조영손(Young-Son Cho),남기두(Ki-Du Nam) 한국생물공학회 2016 KSBB Journal Vol.31 No.1

The aim of this study attempted to verify the possibility of bioethanol production using wasted medium density fiberboard (wMDF). In order to produce bioethanol from wood cellulosic materials must be carried out the process of pretreatment, saccharification, fermentation and distillation. First, the wMDF was pretreated using sodium chlorite and pretreated wMDF was prepared to 8% slurry and then slurry was saccharified with the commercial enzyme (Cellic CTec3). The fermentable sugar and pH of saccharified substrate were about 5.5% glucose and 4.4, respectively. Herein we compared the results of ethanol yield according to the nutrients added or without addition to increase ethanol yield. Ethanol fermentation was finished in about 24 hours, but it was delayed in experimental group without nutrients. Ethanol content and fermentation ratio of the final fermented mash prepared by utilizing jar fermenter was 25.40 g/L and 86.64%, respectively. At this time, the maximum ethanol productivity was confirmed as 1.78 g/Lh (ethanol content 21.38 g/L, 12 h), and the overall ethanol productivity was 1.05 g/Lh (ethanol content 25.27 g/L, 24 h). Using fermented liquid we could produced bioethanol 95.37% by continuous distillator packed with copper element in laboratory scale. These results show that wMDF has a potential valuable for bioethanol production.

대퇴 전자간 역사상 골절에서 전자부 안정화 금속판을 이용한 압박 고 나사의 치료 결과

민병우 ( Byung Woo Min ),이경재 ( Kyung Jae Lee ),김교욱 ( Gyo Wook Kim ),배기철 ( Ki Cheor Bae ),이시욱 ( Si Wook Lee ),김두한 ( Du Han Kim ) 대한골절학회 2014 대한골절학회지 Vol.27 No.2

목적: 대퇴 전자간 역사상 골절의 수술적 치료에서 전자부 안정화 금속판을 이용한 압박 고 나사의 치료 결과를 알아보고자 하였다. 대상 및 방법: 2000년 1월부터 2012년 12월까지 대퇴 전자간 역사상 골절로 인해 전자부 안정화 금속판을 이용한 압박 고 나사로 수술한 환자들 중 1년 이상 추시가 가능하였던 33예를 대상으로 하였다. 술 후 골유합까지 기간, 대퇴 경간각의 변화, 지연 나사의 활강 정도, 술 후 합병증 등을 평가하였다. 결과: 총 33예 중 28예에서 만족할 만한 정복을 얻었다. 만족스럽지 못한 정복을 얻은 5예에는 기구 파손이 1예, 15 mm 이상의 과도한 활강이 2예, 10도 이상의 내반변형이 1예, 내회전 변형이 1예가 있었다. 수술 시 10도 이상의 내반변형이 있었던 1예와 내회전 변형을 보인 1예에서 추후 교정 절골술을 시행하였으며 과도한 활강을 보였던 1예에서는 인공 고관절 반치환술을 시행하였다. 29예에서 골유합을 얻었으며 골유합까지 기간은 평균 19.2주였다. 결론: 대퇴 전자간 역사상 골절에서 전자부 안정화 금속판을 이용한 압박 고 나사는 유용한 치료 방법이 될 수 있다. 그러나 성공적인 치료를 위해서는 정확한 골절의 정복과 적절한 위치에 기구의 삽입이 반드시 필요할 것으로 생각된다. Purpose: The aim of this study was to analyze the use of a compression hip screw with a trochanter stabilizing plate for treatment of reverse oblique intertrochanteric fractures.Materials and Methods: We reviewed the results of 33 cases of reverse oblique intertrochanteric fracture treated with a compression hip screw with a trochanter stabilizing plate from January 2000 to December 2012 which were followed-up for more than one year. We evaluated postoperative bone union period, change of neck-shaft angle, sliding of hip screw, and other complications.Results: Of 33 patients, satisfactory reduction was achieved in 28 patients. Five patients had an unsatisfactory reduction, with two cases of excessive screw sliding, one of broken metal, one of varus deformity, and one of internal rotation deformity. We performed corrective osteotomy in varus and internal rotation deformity and partial hip replacement in a case of ex-cessive screw sliding. Bone union was achieved in 29 patients, and the average bone union period was 19.2 weeks.Conclusion: We consider that a compression hip screw with a trochanteric stabilized plate is a good option for treatment of reverse oblique intertrochanteric femoral fractures. However, adequate fracture reduction and ideal implant placement are a basic necessity for successful treatment.

바이오에탄올 생산을 위한 폐MDF의 전처리 및 효소 당화

강양래(Yang-Rae Kang),황진식(Jin-Sik Hwang),배기한(Ki-Han Bae),조훈호(Hoon-Ho Cho),이은정(Eun-Jeong Lee),조영손(Young-Son Cho),남기두(Ki-Du Nam) 한국생물공학회 2015 KSBB Journal Vol.30 No.6

The objective of this study was designed to determine the possibility of bioethanol production from wasted medium density fiberboard (wMDF). We were investigated the enzymatic saccharification characteristics using the enzyme (Cellic CTec3) after pretreatment with sodium chlorite. According to the component analysis results, the lignin contents before and after the pretreatment of wMDF (milling using sieve size of 1,000 μm) was significantly reduced from 31.13% to 4.11%. Therefore, delignification ratio of pretreated wMDF was found to be up to about 87-89% depending on the sieve size. And we were tested to compare the saccharification ratio according to the sieve size of wMDF (1,000 μm, 200 μm), but it was no significance depending on the sieve size. When enzyme dosage was 5% based on the substrate concentration, enzymatic saccharification ratio was obtained up to 70% by maintaining at 50℃ for 72 hours. We could made the substrate concentration of pretreated wMDF (1,000 μm) up to 12% and then enzymatic saccharification ratio was 76.8%, also contents of glucose and xylose were analyzed to 77,750 and 14,637 mg/L, respectively.

세리신 가공제에 의한 폴리에스터 직물의 친수화 가공

박인우(In-Woo Park),황계순(Gye-Soon Hwang),홍영기(Young-Ki Hong),배한수(Han-Soo Bae),배기서(Kie-Seo Bae) 한국염색가공학회 2009 韓國染色加工學會誌 Vol.21 No.1