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재생골재 콘크리트의 현장적용을 위한 실험적 연구 - 전기충격식으로 수중파쇄된 재생골재를 중심으로 -
박희곤,정근호,임남기,이영도,정상진,정재영,Park, Hee-Gon,Jung, Keun-Ho,Lim, Nam-Ki,Lee, Young-Do,Jung, Sang-Jin,Jung, Jae-Young 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.1
The production accounts of domestic by-product is increased after 1990's. It is worried about the life reduction of dump land, as dump land's capacity have reached to limitation and the amount of construction industrial wastes is going higher. Recently, recycling aggregates could be gained from the reconstruction works using recycle process, and the study research of recycle concretes developed concrete application methods. It could put some outcome of studies to practical use for concrete products. The methods of crushing waste concrete are going diverse. In this study. the fundamental experiments and recycling application is investigated and analyzed with use of recycling aggregate which made of mechanical crush and underwater electrical impact crush, and the difference between underwater electrical impact crush, mechanical crush and natural aggregates is studied.
잔골재 함수율에 따른 질량 및 부피변화에 관한 실험적 연구
박희곤(Park Hee-Gon),권해원(Kwon Hae-Won),이진우(Lee Jin-Woo),김우재(Kim Woo-Jae),배연기(Bae Yeon-Ki),이재삼(Lee Jae-Sam) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The crisis of aggregate supply has been serious for the last three years, and is recently even worsening with the stoppage of the import of sand from North Korea in May 2007. The problem in aggregate supply is spreading throughout the country, and in June 2007 ready mixed concrete companies in Chungcheongbuk do stopped their operation as they could not be supplied with aggregate. Due to the difficulty in aggregate supply, there can be problems in the quality and quantity of aggregate supplied to ready mixed concrete companies. Particularly in fine aggregate with a relatively high water absorption ratio compared to coarse aggregate, there can be the change of volume and weight according to the water content of aggregate. In addition, it is believed that, with the same volume, the weight may change according to the water content of fine aggregate depending on the distance of transportation. Particularly for washed sand used by most of ready mixed concrete companies in the capital area, the variation of its property, volume and weight is considered larger than that of river sand used in the past. However, previous researches on washed sand are mostly for the absolute dry state and surface dry state, and few researches have been made on changes in the volume and weight of aggregate according to water content. In this situation, it is very hard for each ready mixed concrete company to manage supplied aggregate. Thus, the present study purposed to examine the change of weight and volume of aggregate according to water content and the distance of transportation for fine aggregate supplied to the present company, to measure the variation of the weight and volume of fine aggregate supplied to ready mixed concrete companies according to water content, and ultimately to find the optimal water content of aggregate supplied and the optimal weight and volume for the water content.
박희곤 ( Hee-gon Park ),신용은 ( Yong-eun Shin ),김성현 ( Sung-hyun Kim ) 대한골절학회 2017 대한골절학회지 Vol.30 No.1
목적: 고관절 탈구는 합병증 발생이 흔하기 때문에 신속하고 정확한 정복이 중요하다. 저자들은 고관절 탈구 중에서도 일차적 도수 정복 실패 증례를 대상으로 분석하여 정복을 방해하는 인자들을 파악하고자 한다. 대상 및 방법: 2007년 1월부터 2015년 9월까지 단국대학교병원에 내원한 고관절 탈구 환자 87예를 대상으로 후향적 분석을 하였다. 68예에서 첫 번째 도수 정복에 성공했으며, 첫 번째 시도에 실패한 19예 중 12예는 재시도에 성공하였으나 7예는 전신마취하에 관혈적 정복을 시행하였다. 모든 도수 정복은 정형외과 의사 최소 2인에 의해 행해졌으며, 관혈적 정복은 동일 술자에 의해 시행되었다. 결과: 50세 미만, 남성, 고관절 주위 골절이 동반된 환자에서 첫 번째 도수 정복 시도 실패의 가능성이 높았다(p<0.05). 특히 고관절 내 감입되고 골편이 큰 경우 두 번째 정복에서도 실패하여 관혈적 정복이 필요할 가능성이 높았다. 결론: 50세 미만, 남성, 고관절 주위 골절이 동반된 환자는 첫번째 도수 정복 시도 실패 가능성이 높으므로 환자의 연령과 성별, 골절의 동반 및 골절편의 위치와 크기에 대한 파악이 중요하며, 특히 고관절 내 골편이 감입되어 있고 골편이 클 경우 반복적인 도수 정복 시도보다 수술적 치료도 적극적으로 고려해야 할 것으로 생각된다. Purpose: A rapid and accurate reduction is important for hip dislocated patients to avoid various potential complications, including avascular necrosis of the femoral head. We analyzed hip dislocation cases, ones that particularly failed during the primary reduction trial. Materials and Methods: Eighty-seven patients with hip dislocation, who visited the emergency department between January 2007 and September 2015, were retrospectively analyzed. Of them, 68 patients were successfully treated in the first closed reduction trial, and the remaining 19 patients were unsuccessful. Of the 19 unsuccessful first trial, 12 patients were successfully treated in the second closed reduction; however, in the remaining 7 patients, open reduction was performed in the operation room with general anesthesia. Every closed reduction was practiced by at least 2 orthopedic doctors, and open reduction was performed by a single senior author. Results: The rate of first reduction failure was higher, with statistical significance, in patients aged under 50 years, male gender, and those with combined around hip fractures, including femoral head and acetabular fracture (p< 0.05). In particular, the presence of impacted fracture fragment in the hip joint and large size of the impacted fracture fragment was highly related to the failure of second closed reduction trial requiring open reduction. Conversely, the method of reduction, Thompson-Epstein classification, Pipkin classification were not related to the failure of closed reduction statistically (p >0.05). Conclusion: To evaluate the patients with hip dislocation, realizing the type of dislocation, presence of accompanied fracture, location and size of fracture fragment, age, as well as gender of patients is important. If the fracture fragment is impacted in the hip joint and the size of the fragment is large, then the operative treatment is considered, rather than the repetitive trial of closed reduction by constraint.
원위 대퇴골 골절에 대한 고령 환자군의 치료 결과 비교 -임상적, 방사선학적 비교-
박희곤 ( Hee Gon Park ),김연준 ( Yeon Jun Kim ),장호성 ( Ho Seong Jang ) 대한외상학회 2013 大韓外傷學會誌 Vol.26 No.4
Purpose: To report the postoperative Clinical and Radiological outcomes following distal femoral fractures in elderly patients compared with young patients. Methods: From March, 1996 to March, 2012, 83 patients who received surgical treatment for fractures of the distal femur were enrolled in this retrospective study. Ages more than 65 was named group A. Group A was 49 cases and mean age is 72.5 year(65~91year). Group B was 49 cases and mean age is 45.7 year(16~61 year). Surgical methods are retrograde IM nail, locking compression plate, cannulated screw and postoperative rehabilitation is no difference between two groups. Clinical results were evaluated using Neer scores, radiographic results and the presence of clinical complications. Results: The mean union period was 18.4(12-40) weeks in group A and 17(10-24) weeks in group B. Neer functional scores are no significant statistical difference between two groups. There are 5 cases metal breakage in group A and 1case in group B. There are 3 cases nonunion in group A and 1 case in group B. Conclusion: In the case of fractures of the distal femur in elderly patients, locking plate using minimally invasive percutaneous periosteal osteosynthesis (MIPPO) technique may be one of the most effective methods and preoperative bone stock evaluation in important.
구조체 균열 하자 저감을 위한 균열 저감형 콘크리트의 기초적 연구
박희곤 ( Hee Gon Park ),이지환 ( Ji Hwan Lee ),박기홍 ( Ki Hong Park ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.1
The root cause of the crack flaw occurred in construction. This crack is represented by a construction flaw occurs in the concrete structure. Therefore, we introduce the basic properties for the type of concrete to crack reduction measures to minimize the causes flaw this paper.
전방십자인대 재건술 후 경골 후방 경사각이 안정성과 이차 관절경 소견에 미치는 영향
박희곤(Hee-Gon Park),유재성(Jae-Sung Yoo),황창환(Chang-Hwan Hwang) 대한정형외과학회 2013 대한정형외과학회지 Vol.48 No.4
목적: 전방십자인대 재건술 후 경골 후방 경사각이 임상적 및 이차 관절경 검사에서 안정성에 미치는 영향을 분석하고자 하였다. 대상 및 방법: 2000년에서 2011년까지 동종이식건을 이용하여 전방십자인대 재건술을 받은 124명을 대상으로 하였다. 경골 후방 경사각이 5o 미만인 28예를 A군, 5˚ 이상 10˚ 미만인 64예를 B군, 10˚ 이상인 32예를 C군으로 나누어 Lachman 검사, KT-2000 관절계를 통해 전방 안정성을 비교하였으며, 관절경 소견은 긴장 정도, 활액막 형성 정도를 비교 분석하였다. 결과: 최종 추시 시 KT-2000 관절계 검사에서 건측과 통계적으로 유의한 차이를 보이지 않았고(p=0.17), Lachman검사에서도 유의한 차이를 보이지 않았다(p=0.83). 이차 관절경 소견상 이식건의 긴장도는 A군과 B군 간 통계적으로 유의한 차이를 보이지 않았으나(p=0.58), A군과 C군 간(p=0.01) 그리고 B군과 C군 간(p<0.01)에서는 통계적으로 유의한 차이를 보였다. 결론: 경골 후방 경사각이 10˚ 이상인 경우 전방십자인대 재건술 후 시행한 이차 관절경 소견상 이식건의 긴장도가 통계적으로 유의하게 이완된 소견을 보였으나, 임상적 안정성 평가에서는 통계적으로 유의한 차이를 보이지 않았다. Purpose: The purpose of this study was to analyze the influence of posterior tibial slope on stability in clinical and second-look arthroscopic evaluation after anterior cruciate ligament (ACL) reconstruction. Materials and Methods: From 2000 to 2011, 124 patients who underwent ACL reconstruction using an allogaft were enrolled in this study. A posterior tibial slope between 0˚ and 4˚ was found in 28 patients (group A), between 5˚ and 9˚ in 64 patients (group B), and greater than 10˚ in 32 patients (group C). We evaluated stability using the Lachman test and a KT-2000 arthrometer. In second-look arthroscopy, grafted tendons were evaluated based on the tension, rupture, and synovial coverage. Results: In clinical evaluation for stability, mean KT-2000 arthrometer and Lachman test at last follow-up showed no statistically significant differences depending on posterior tibial slope. Second-look arthroscopic findings showed no statistically significant difference between groups A and B (p=0.91). However, statistically significant relations were observed between groups A and C (p=0.03), and between groups B and C (p=0.02). Conclusion: The results of this study suggest that patients who underwent ACL reconstruction with higher posterior tibial slope (≥10˚) have more lax tension in second-look arthroscopy, but not in clinical stability tests.
박희곤(Park Hee-Gon),김우재(Kim Woo-Jae),배연기(Bae Yeon-Ki),이한승(Lee Han-Seung),정상진(Jung Sang-Jin),이재삼(Lee Jae-Sam) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
As high rise buildings with 100 or more stories are being constructed, it is inevitable to use high performance materials including high performance concrete. What is most important in high performance concrete is extremely high strength in order to reduce the section of members in high rise buildings. During the last several years, there have been active researches on Ultra high strength concrete. While these researches have been mostly focused on strength development, however, other accompanying physical properties have not been studied sufficiently. Thus, the present study purposed to obtain and analyze data on the physical mechanical properties of Ultra high strength concrete through experiments and to use the results as basic information on required performance of concrete used in high rise buildings.