홍수재해 예방을 위한 우수저류시설 설계기법 연구

이길영,성도용 대전대학교 산업기술연구소 2001 산업기술연구소 論文集 Vol.12 No.1

Recent development booms in the upper and middle area of urban watersheds have changed the hydrological responses of watershed due to increase of impermeable areas. Urbanization has brought about an increase of peak flood and total discharge volumes greatly compared with pre-urbanization flood. Some of the people living in the lower area of an urban watershed, very often and seriously, have suffered from inundation. A new concept for urban storm water management is reduction of runoff from the sources in site. This concept has been applied in some countries such as Japan and it has turned out to be an effective measure for urban storm water management. The purpose of this study is to suggest the methodology for the design of storm water reduction facilities. And the design of runoff reduction facilities from source areas and guidelines for the formulation of storm water management policy were proposed. The runoff reduction facilities are including on-line type and off-line type ponds.

성인의 천미추부 종괴

조길환,이백권,장도명,김영진,안상태 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.3

We developed an animal model to recreate the condition of an open fracture in communication with the maxillary sinus. We then studied wound healing of the sinus wall structures following fracture in the presence of autogenous bone and alloplastic implant. This model is designed to simulate the repair of an orbital floor fracture in humans. The New Zealand White rabbit was used as the animal model. Standardized 8mm defects were made bilaterally in the maxillary sinuses to include bone and mucosa in 36 rabbits. Two different implants and autogenous calvarial bone graft were placed in the soft-tissue pockets to obturate the defects, exposing one surface of the implant to the open sinus. Medpor porous polyethylene, silicone and calvarial bone implant were compared. Animals were killed at 1, 2 and 8 weeks after implantation. Gross examination of the specimens for the amount of mucosal closure and implant tissue fixation was performed. Histological sections were evaluated for bone and soft-tissue morphology juxtaposed to the implant. Complete closure of the mucosal defect was demonstrated with each type of implant. Medpor implants showed both vascular and soft-tissue ingrowth into pores by week 1. Bone ingrowth was seen by week 2. Closure of the Medpor obturated defects occurred more rapidly than in the silicone group. The Medpor implants and calvarial bone demonstrated bone and soft-tissue fixation, callus formation and maturation, while mature overlying mucosa was reconstituted over the defects. Silicone implants demonstrated a fibrous tissue reaction within 1 week of implantation and they never became fixed to bone or soft tissue. Maxillary sinus wall regeneration occurred in all defects. This study supports clinical observations of maxillary sinus wall regeneration in humans. Although sacrococcygeal mass is rare and usually found in infants or children, adolescent or adult patients with protruding mass in sacrococcygeal region occasionally come to us simply for a cosmetic problem. In this situation, even though there is no definite neurological deficit, it should be evaluated whether or not the underlying bony pathology or dural defect exists. Few cases about the sacrococcygeal mass have been reported in adults. We reviewed our cases including preoperative evaluation methods and postoperative diagnosis. From March, 1993 to February, 1997, we experienced 6 adult patients with sacrococcygeal mass and no neurological abnormality. Preoperative evaluation were made by plain X-ray, myelogram, computed tomography(CT), and magnetic resonance imaging (MRI), as needed. Postoperative diagnoses were 2 meningoceles, 2 lipomyelomeningoceles, 1 desmoid tumor, and 1 teratoma. From our experiences, CT or MRI is essential to evaluate the sacrococcygeal mass preoperatively. These methods can visualize the precise anatomic location and extent of the mass, its relation to the spinal cord, and associated bony abnormalities. MRI is superior to CT, especially in defining the nature of the mass and involvement of the spinal cord. Conclusively, even a simple mass in the sacrococcygeal region in adults needs MRI or CT evaluation, and MRI is the most valuable method of evaluating the mass preoperatively and provides important information to establish a treatment plan.

초속경 라텍스개질 콘크리트의 초기수축 및 구속건조수축

최판길,김용곤,심도식,이봉학 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

Recently, very-early strength latex-modified concrete(below ; VES-LMC) has been developed for repairing and overlaying the old concrete bridge deck. VES-LMC provides the advantage of very-early-strength, as well as high flexural strength, bond strength, durability, resistance to corrosion, reduced water permeability and resistance to damage from freeze-thaw cycles. The compressive and flexural strength of VES-LMC are 21 MPa and 4.5 MPa at 3 hours after concrete placing, respectively. However, VES-LMC would have a relatively large shrinkage at early-age because of reduced water-cement ratio, big water self-dissipation, and rapid hydration reaction. Therefore, the purpose of this study was to evaluate the early-age and restrained shrinkage of VES-LMC, having an experimental variables such as latex contents and cement types. The latex contents included 0%, 5%, 10%, 15% and 20%, and the cement types included ordinary portland cement and very-early strength cement.

전단보강근량에 따른 초고강도 콘크리트를 사용한 고층형 내력벽의 이력거동

윤현도,연길환,정수영,윤석천,이창갑 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.1

Three one fourth scale models using ultra high-strength concrete(f' =704 kg/㎠) are tested under the combined action of a constant axial and a horizontal load cyclically to failure. Such specimens are considered to represent the critical 3-story of low part in 60-story tall building of a structural wall system in area of high seismicity. The amount of vertical reinforcement and the level of applied axial stress are identical for the three wall tested. The cross-section of all walls is barbell shape. The aspect ratio(h /l ) of test specimen is 1.8. The primary objectives of this paper are to investigate the influence of the amount of horizontal reinforcement on the lateral resistance, failure mechanism, ductility and energy-dissipation capability of walls with ultra high-strength concrete. In contrast to what is widely believed, the horizontal web reinforcement does not appear to have a significant effect on shear capacity. Certainly, since the reduction of the web horizontal reinforcement to almost half the value specified by building codes doesn't affect the failure load, this effect in not accounted for by the truss analogy concept. The results obtained have helped to identify the causes of wall failure and have demonstrated that the concepts underlying current ACI Building Code provisions for the design of walls conflict with the observed structural behavior. It has been found that shear resistance is associated with triaxial compressive stress conditions that develop in the compressive zone of the section at the base of the wall.

흡입관에 부착된 디퓨저 효과에 대한 연구

김도태,이행남,박길문,이덕구,설재림 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1

The diffuser is used to get low pressure, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc... because there are not any problem even it is mixed with kinds of liquid, gas, and solid. The flow characteristics in diffuser are investigated by prv and CFD. The experiment using PIV measurement for mixing pipe's flow characteristics acquired velocity distribution, .Condition : when mixing pipe's diameter ratio is 1:2.3, and the flux is Q₁ = 1.136 l/s, Q₂ = 1.706 l/s, Q₃ = 2.276 l/s . Based on the PIV and the CFD results, the flow characteristics in ejector are discussed, and it shows the validity of this study.

GO에 의해 유도된 培養 脊髓感覺神經細胞 독성에 대한 鎭肝熄風湯의 방어효과

박광수,이호승,김인수,강길성,김인규,김인섭,류도곤 한국전통의학연구소 2003 한국전통의학지 Vol.13 No.1

To evaluate the effect of Jingansikpungtang water extract on cultured mouse spinal sensory neuron which was inhibited by glucose oxidase(GO)-induced cytotoxicity, NR assay and TBARS assay for lipid peroxidation were carried out after the cultured mouse spinal sensory neuron were pre-incubated with various concentrations of Jingansikpungtang water extract for 3 hours prior to exposure of GO. GO, a oxygen radical, decreased the survival rate of the cultured mouse spinal sensory neuron cells on NR assay. Jingansikpungtang water extract have efficacy of decreasing lipid peroxidation increasing by GO in cultured mouse spinal sensory neuron. From above the results, it is concluded that Jingansikpungtang has marked efficacy as a treatment for the damages caused in the GO-mediated oxidative process.

무갑상선 쥐에서 중식성 반흔의 새로운 실험모델

김영진,이백권,장도명,조길환,임풍 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.4

Proliferative scarring in the form of keloids and hypertrophic scars continues to be a clinical problem for some patients. The lack of an animal model for such scarring has been an obstacle to studying the biology and effective therapy of these entities. Consequently we created an accurate reproductive animal model to systematically study them. Human proliferative scars were explanted into flaps based on isolated vascular pedicles in congenitally rats. We compared the procollagen type Ⅲ peptide levels of proliferative scar tissue before and after explanting. The procollagen type Ⅲ peptide levels of explanted proliferative scar tissue remained increased as before explanting. Histological analysis of the explanted proliferative scar tissue revealed that all explants retained their original histotypic character even after 1 year. We could also retain the volume of implanted proliferative scar for 1 year and studied in vitro cellular proliferation. Fibroblast cultures from explanted scars demonstrated less aggressive growth characteristic than those from original surgical specimens. The advantages of this animal model are as follows: 1. The explants retain their histotypical character for a long period. 2. Placement of the explants outside the dorsum of a nude rat makes serial observation and measurement easier. 3. Agents under test can be injected into the explants through a catheter inserted into a single pedicle of island flap without the possibility of spreading systematically.

경부에 발생한 의인성 괴사성 근막염의 증례

문철,권혁도,이동근,박경옥,성길현,이재은 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1

Necrotizing fascitis is a severe soft tissue infection characterized by extensive necrosis of superficial fascia, suppurative fascitis, vascular thrombosis, widespread undermining of surrounding tissues. Accociated systemic problems are widespread undermining of surrounding tissues, Accociated systemic problems are common, with chronic alcoholism and diabetes being most prominent. Most commonly this disease presents in the extremities, trunk, and perineum. Necrotizing fascitis of dental origing is rare and its fulminating clinical course is not well documented in the dental literature. The present report is a case of necrotizing fascitis following vital extirpation of the pulp in a patient with uncontrolled diabetes mellitus and liver cirrhosis. Originally throught to be caused by hemolytic streptococcus organism or stphylococcus aureus, advances in anaerobic culturing have shown it to be a synergistic bacterial infection involving aerobic and ovligate anaerobes. it is relatively rare in relatively rare in haea and neck regions. If it was not diagnosed and treated in early stages, necrotizing fascitis can be potentially fetal, with a mortality rate approaching 40%. It's treatment requires early recognition, prompt and aggressive surgical debriment and proper supportive cares, such as, antibiotic therapy, fluid resuscitation and correction of metabolic and electrolyte disorder, resolving of the underlying systemic disease. Recently, we experienced two cases of necrotizing fascitis in cervicofacial region, One patient was 60 years old male with uncontrolled Diabetes Mellitus and other patient was 48 years old with steroid therapy during 30 years. Local surgical wound healing was successful but, patients were died after admission, because of lung abscess, gastrointestinal bleeding, septic shock and respiration hold.

간월호 퇴적토에서의 영양염류 용출 특성 분석

황순호 ( Soonho Hwang ),전상민 ( Sang Min Jun ),이도길 ( Do Gil Lee ),김석현 ( Seok Hyeon Kim ),이현지 ( Hyunji Lee ),김계웅 ( Kyeung Kim ),강문성 ( Moon Seong Kang ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-

간월호는 서산시에 위치한 수혜면적이 6,446 ha에 이르는 담수화된 농업용 저수지로서, 해수 차단 후 수질이 지속적으로 악화되어 최근 들어 호내 수질이 농업용수 목표수질인 Ⅳ등급을 상회하는 등 농업용수로 활용에 어려움을 겪고 있다. 이에 따라 수질 악화 원인을 규명하기 위한 다양한 연구가 이루어지고 있으며, 수질 오염을 야기하는 상류 유역에 대한 연구뿐만 아니라 호내 퇴적물 관리 및 퇴적물로 인한 영양염류의 용출 문제에 대한 연구도 중요하다고 할 수 있다. 따라서 본 연구에서는 간월호 퇴적토로부터의 호내 수질 오염 기여도를 평가하기 위한 기초자료로서 용출 실험을 실시하였다. 용출 실험은 간월호 호내 3지점 (상류, 중류, 하류)에 대해 각각 호기성, 혐기성 실험을 2회 반복하였으며, 오염물질 조사 항목은 TOC, NH₄-N, NO₂-N, NO₃-N, PO₄-P, T-P, T-N, COD로 총 8항목이다. 간월호 용출 실험에 앞서 용출 실험 재료인 퇴적토의 간월호 퇴적물의 오염도를 확인하기 위하여, 입도 분석뿐만 아니라 강열감량, 유기물함량, T-N, T-P 항목에 대한 분석을 실시하였으며, 퇴적토는 풍건 및 2 mm 체 선별 후 지름 10cm, 높이 44cm의 유리컬럼에 충진하여 이용하였다. 현장 조건 중 호기 및 혐기 조건을 모의하기 위해, 호기성 조건은 DO의 일정 농도가 유지되도록 폭기 장치를 이용하였으며, 혐기조건은 알루미늄 호일로 컬럼 외부를 감싸 빛을 차단하는 동시에 질소가스를 계속 주입하여 혐기상태를 유지하였다.

관개지구 물관리기법에 따른 논벼 생육 및 수확량 분석

이도길 ( Do Gil Lee ),강문성 ( Moon Seong Kang ),김계웅 ( Kye Ung Kim ),류정훈 ( Jeong Hoon Ryu ),이현지 ( Hyunji Lee ),이재남 ( Jaenam Lee ),이재주 ( Jaeju Lee ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-

최근 기후변화에 따른 가뭄으로 인해 농촌 지역에서 수자원 부족 현상이 빈번하게 발생하고 있다. 수자원의 부족은 안정적인 농업 생산에 어려움을 야기한다. 하지만 농업용수의 수요자인 농민들은 여전히 물 절약에 대한 인식이 미비한 실정이며, 그로 인해 용수의 과잉 사용 및 무효 방류에 따른 용수 손실이 과다하게 발생하고 있다. 농업용수를 관리하는 물관리기법 중 하나인 간단관개는 하루 또는 며칠 간격으로 관개하는 방법으로서, 제한된 수량을 유효하게 이용할 수 있는 장점이 있다. 본 연구에서는 간단관개의 적용을 위하여, 시험지구 모니터링 시스템을 구축하고, 간단관개 시나리오를 구축하였으며, 수문 모니터링을 수행하고, 물수지 분석을 통해 유입량을 분석하고, 물관리기법에 따른 논벼의 생육과 수확량을 비교 분석하였다. 물관리기법 적용을 위한 연구 대상지는 경기도 화성시 장안면에 위치한 6개 논 포장이며, 각 2개 포장씩 묶어 대조구(관행 관리담수심 유지), 절수 처리구A(관리담수심: 20∼80 mm), 절수 처리구B(관리담수심: -100 mm)로 시험포장을 구성하였다. 수문 모니터링을 위해 초음파 수위계, 부자식 수위계, 물꼬 및 위어, 감수심계, 침투량계 등을 설치하였으며, 수문 모니터링 결과를 바탕으로 논 물수지 분석을 수행하였다. 물관리기법이 논벼의 생육 특성 및 수확량에 미치는 영향을 분석하기 위해 처리구별 비교 분석을 수행하였다. 본 연구의 결과는 가뭄시 농업용수를 효율적으로 이용하기 위한 기초자료로 활용될 수 있을 것으로 사료된다.