X-Ray 및 수중중량을 이용한 투수성 콘크리트의 간극률 산정

안재훈,이윤석,김정호,이성우,Ahn,Jaehun,Lee,Younseok,Vaidya,Susurut,Kim,Jeong-Ho,Lee,Seong-Woo 한국방재학회 2013 한국방재학회논문집 Vol.13 No.4

최근 국제적으로 발생하는 지속적인 기후변화및 도시화, 그리고 이에 따른 강우량과 강우강도의 변화로 인해 새로운 수자원 및 재해에 대한 관리 체계가 필요한 실정이다. 투수성 콘크리트에 대한 연구는 도심홍수 등의 문제로 인하여 발생하는 피해를 예방하기 위한 하나의 주요한 요소기술로 대두되고 있으며, 이에 따라 현재 우리나라에서는 보도, 주차장, 자전거 도로 등 경하중 하의 포장시설로서 투수성 포장이 활발하게 적용되고 있다. 투수성 포장의 수문학적 설계를 위해 가장 널리 쓰이는 방법은 곡선지수를 이용한 방법이며 설계 시에 가장 중요한 포장체의 물성은 간극률이다. 본 연구에서는 실내시험을 통해 투수성 콘크리트의 간극률을 산정하는 방법을 제안하고 이를 통해 산정한 간극률을 X-Ray 이미지 분석을 이용한 간극률의 결과와 비교, 검증한다. 최대입경 6 mm 정도인 투수성 콘크리트의 간극률 산정 결과는 30% 정도로서 X-Ray 이미지를 사용한 결과와 시료의 건조, 수중중량을 측정하여 산정한 결과가 매우 근사한 값을 가지는 것을 확인할 수 있었다. Recently due to climate change and urbanization, and following changes in rain fall pattern, the stormwater management is becoming a major issue for research in civil and urban engineering. The use of pervious pavement is one of promising tools to control runoff and water quality along with several other benefits, and therefore the pervious pavement is widely adopted for sidewalks, parking lots, and bike roads where the loads are not heavy. The porosity of the pervious pavement is the most important property of the pavement regarding current hydrologic design in practice. In this article, the porosity of a pervious concrete sample cored from the road for bikes and pedestrians are evaluated by two approaches: measuring dry and submerged weights and X-Ray image analysis, and the test procedure is proposed. The porosities estimated by two approaches were both around 30%, and they gave consistent results.

중족지 관절경을 이용한 Freiberg 병의 치료 -1예 보고-

안재훈,이승훈,이광원,최원식,감병섭,Ahn, Jae-Hoon,Lee, Seung-Hun,Lee, Kwang-Won,Choy, Won-Sik,Kam, Byoung-Sup 대한관절경학회 2007 대한관절경학회지 Vol.11 No.1

Freiberg 병은 비교적 드문 골연골증으로 주로 사춘기 여자의 제2 중족골 두에서 발생한다. 그 치료는 다양하여 관절내 유리체 제거술, 골두 절골술 또는 골두 절제술 등의 수술이 시도되고 있다. 관절경을 이용한 치료는 회복 기간을 단축시키는 동시에 술후 발생하는 강직을 감소시키는 장점이 있다. 저자들은 초기의 Freiberg 병에 대해 중족지 관절경을 이용하여 유리체 제거술 및 변연절제술을 시행하고 그 결과를 보고하고자 한다. Freiberg disease is a relatively rare osteochondrosis of metatarsal head, which usually involves the 2nd metatarsal of adolescent females. Various open surgical treatments have been recommended; arthrotomy and removal of loose body, dorsiflexion osteotomy and resection of the metatarsal head. Arthroscopic treatment for Freiberg disease has a merit of shortening the recovery period and reducing the postoperative stiffness. We report a case of early stage Freiberg disease treated with metatarsophalangeal arthroscopic excision of loose body and debridement of the 2nd metatarsophalangeal joint.

전위된 거골 경부 골절의 수술적 치료

안재훈,백창현,최원식,김용인,Ahn, Jae-Hoon,Baek, Chang-Hyun,Choy, Won-Sik,Kim, Yong-In 대한족부족관절학회 2006 대한족부족관절학회지 Vol.10 No.2

Purpose: To evaluate the results of open reduction and internal fixation for displaced talar neck fracture. Materials and Methods: Fourteen patients were followed for more than 1 year after open reduction and internal fixation of displaced talar neck fracture. The mean age was 41.5 years, and the mean follow-up period was 3.8 years. There were 10 type II, 3 type III and 1 type IV fractures per Hawkins. There were 3 open fractures. Clinically AOFAS ankle-hindfoot scale and Hawkins criteria were utilized. Radiologically quality of reduction, duration of bony union, avascular necrosis and posttraumatic arthritis were evaluated. Results: At last follow-up, AOFAS scale was mean 89.1 points. There were 8 excellent, 4 good, and 2 fair results according to Hawkins criteria. Radiologically anatomical reduction was obtained in 13 cases. Mean duration of bony union was 11.8 weeks. There were 3 avascular necrosis and 2 post-traumatic arthritis. There was no significant difference in the incidence of avascular necrosis between early operation group and surgically delayed group. Conclusion: Accurate open reduction and rigid internal fixation seem to be prerequisites for satisfactory treatment of a displaced talar neck fracture.

골간부 사형 절골술을 이용한 소건막류의 치료

안재훈,김하용,강종원,최원식,김용인,Ahn, Jae-Hoon,Kim, Ha-Yong,Kang, Jong-Won,Choy, Won-Sik,Kim, Yong-In 대한족부족관절학회 2008 대한족부족관절학회지 Vol.12 No.1

Purpose: The authors intended to evaluate the results of symptomatic bunionette treated with a diaphyseal oblique osteotomy. Materials and Methods: Nine patients were followed for more than 1 year after diaphyseal oblique osteotomy for a bunionette deformity with plantar callosity. The mean age was 43 years (23-69 years), and the mean follow-up period was 27 months (12-70 months). As a combined disorder, 7 patients had hallux valgus, for which 3 distal metatarsal oteotomies, 3 proximal osteotomies, and 1 double osteotomy were performed. Clinically, preoperative and postoperative AOFAS MP-IP scale, patient's satisfaction, postoperative complications were analyzed. Radiologically, the 4th intermetatarsal angle and the 5th metatarso-phalangeal angle were analyzed. Results: Clinically, AOFAS MP-IP scale was increased from 59 points preoperatively to 93 points postoperatively, and all patients were satisfied with the results. The plantar callosity had all disappeared at the final follow up. The 4th intermetatarsal angle was decreased from $12.6^{\circ}$ preoperatively to $4.3^{\circ}$ postoperatively, and the 5th metatarsophalangeal angle was decreased from $21.9^{\circ}$ preoperatively to $2.4^{\circ}$ postoperatively. There were no significant postoperative complications. Conclusion: Diaphyseal oblique osteotomy of the 5th metatarsal appears to be safe and satisfactory procedure for the treatment of a symptomatic bunionette with plantar callosity.

Tethered Cord Syndrome 2예

안재훈,선우일남,김기환 대한신경과학회 1986 대한신경과학회지 Vol.4 No.2

Scale-free uPAN 시스템을 위한 효율적인 WiMedia Bridge의 설계 및 구현

안재훈,국중진,이장연,권대길,홍지만 한국인터넷방송통신학회 2008 한국인터넷방송통신학회 논문지 Vol.8 No.5

유비쿼터스 네트워크 환경은 사람 주변의 모든 기기가 하나의 네트워크로 연결되어 끊김없이 정보를 주고받으며 통신을 가능하게 해주는 전자공간과 실제 공간의 융합이다. 유비쿼터스 환경을 구현하기 위해서는 다양한 기기들이 통신을 위한 규격을 맞추어야 한다. 그러나 각 기기들의 규격을 맞추고 늘어나는 트래픽에 대비하는 일은 유지보수 등에 있어 매우 어려울뿐더러 효율적인 기술을 필요로 한다. 이러한 유비쿼터스 환경의 구현을 위해 다양한 주변 기기들과의 통신 연결을 위한 기술로 WiMedia Alliance가 있다. 본 논문에서는 Scale-free uPAN 시스템의 일부인 WiMedia 브릿지 기술 구현을 위한 기법을 제안한다. 제안한 기법은, 패킷 변환 및 브릿지 기법을 추가하여, 통신 기기들 간의 규격 의존 관계에서 발생하는 비용을 최소화 할 수 있다. 본 논문의 실험 결과를 통하여, 제안한 기법이 시간 및 에너지 상으로 보다 효율적임을 보인다.

열 손가락이 그리는 꿈

안재훈 샘터사 2001 월간 샘터 Vol.32 No.1

지반 및 원형기초의 특성이 기초의 동적거동에 미치는 영향

안재훈,Ahn. Jae-Hun 한국방재학회 2008 한국방재학회논문집 Vol.8 No.2

지반 및 원형기초의 물성이 그 기초의 수직 동적거동에 미치는 영향이 해석적 해와 수치해석을 통해 연구되었다. 해석적 해로는 반무한체 지반 위 원형기초의 거동을 나타내는 간략 해가, 수치해석방법으로는 선대칭 유한요소법이 consistent transmitting 경계조건과 함께 사용되었다. 균일한 지반의 물성으로서의 전단파속도는 원형기초 동적거동의 공명진동수에 영향을 주었으나 공명진동시의 최대반응값에는 영향을 미치지 않았다. 같은 경우에 지반의 밀도는 공명진동수와 최대반응값에 모두 영향을 주었다. 균일한 지반 위 원형기초의 크기와 질량도 원형기초 동적거동의 공명진동수와 최대반응값 모두에 영향을 주었으나 균일 지반의 포아송비는 큰 영향을 미치지 않는 것으로 나타났다. 지반이 균일하지 않고 층이 존재할 경우에 각 층의 물성으로의 전단파속도들의 상관관계는 원형기초의 최대반응값에 영향을 주었다. The effect of characteristics of ground and circular foundation on the dynamic behavior of the foundation in vertical motion are considered using an approximated analytical solution and a finite element analysis with absorbing (consistent transmitting) boundary. The shear wave velocity of homogeneous ground affects the resonant frequency of the foundation much but has nothing to do with the maximum response amplitude at resonant frequency. The density in this case affects both the resonant frequency and the maximum response. The size and the mass of the circular foundation are related both to the resonant frequency and the maximum response. However, Poisson`s ratio has very little effect on dynamic behavior of the foundation. When the ground is not homogeneous but has the layers, different formations of shear wave velocities would also change the maximum response at resonant frequency.

발 및 발목 관절 부위의 결절종

안재훈,이항호,최원식,Ahn, Jae-Hoon,Lee, Hang-Ho,Choy, Won-Sik 대한족부족관절학회 2003 대한족부족관절학회지 Vol.7 No.1

Purpose: To analyze the clinical results of excision of the symptomatic or recurred ganglion cysts of the foot and ankle. Materials and Methods: Twenty-one cases of the ganglions located in the foot and ankle area were followed for more than 12 months postoperatively. There were 9 males and 12 females, and the mean age was 42.3 years (range, 11-71 years). The mean duration of follow-up was 2.3 years (range, 1.1-4.1 years). Clinically previous treatment, size and location of the cyst, preoperative and postoperative AOFAS foot score, postoperative complication and satisfaction of patients were evaluated. Results: As a previous treatment, 7 patients received mean 1.3 bouts of aspirations, and 6 patients were recurred after mean 1.5 bouts of operations. The size of cyst ranged from 1.4 cm to 5.1 cm with the mean size of 2.7 cm. The cyst was most common in the dorsum of the foot and ankle, where 14 cases were found. Preoperative mean AOFAS foot. scores were low in the cysts associated with the tarsal tunnel syndrome, which was 71 points, and in the cyst of the plantar aspect of the 1st toe, which was 79 points. Postoperative mean AOFAS foot scores were significantly increased to 91 points and 92 points in preceding two groups. There were 2 cases (9.5%) of recurrence, both of which had satellite mass along the tendon sheath. Conclusion: Care should be taken in the diagnosis and treatment of ganglions in the tarsal tunnel and in the plantar aspect of the 1st toe. In case of ganglion cysts originated from the tendon sheath, consideration should be given for possible satellite mass.

핵의학적 방법에 의한 간질환자의 간장내 단락양측정에 관한 연구

안재훈,윤성철,최수봉 대한핵의학회 1987 핵의학 분자영상 Vol.21 No.1