• Journal of Chest Surgery
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• 제42권2호
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• pp.263-267
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• 2009

혈성 흉수를 동반한 췌흉강루는 췌가성낭포 파열 혹은 췌관 폐쇄에 의해 생기는 드문 질환이다. 만성 음주력이 있는 48세 남자가 다량의 우측 총수로 내원하였다. 흉수 내 아밀라제와 리파제가 상승되어 있었고, 전산화 단층촬영에서 췌가성낭포 파열에 의한 췌흉강루로 진단되었다. 최초 치료로 흉관 배액, 금식, 총정맥영양 및 췌장액 분비억제제 등의 보존적 치료를 시행하여 증상이 호전되었으나, 이후 출혈성 췌가성낭포가 커지고 혈성 흉수가 재발하여 수술적 치료를 하였다. 환자는 특별한 합병증 없이 수술 후 27일째 퇴원하였다.

• 한국농공학회논문집
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• 제58권6호
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• pp.9-21
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• 2016

Agricultural reservoirs in Korea have been recognized as an emerging resource for recreational and cultural activities for residents. However, most of the reservoirs are eutrophic and showing high level of contamination with nuisance algal bloom and offensive odor during the summer. For better management and restoration of the reservoirs' water quality, scientific modeling approaches could be used to diagnose the problems and evaluate the efficacy of alternative control measures. The objectives of this study were to validate the performance of a three-dimensional (3D) hydrodynamic and water quality model (Environmental Fluid Dynamics Code, EFDC) for a eutrophic agricultural reservoir and assess the effect of bypassing of the effluent from a wastewater treatment plant on the reservoir water quality. The 3D model successfully simulated the temporal variations of water temperature, DO, TOC, nitrogen and phosphorus species and Chl-a observed in 2014 and also captured their spatial heterogeneity in the reservoir. The simulation results indicated that the point source bypassing may reduce the T-N and T-P concentrations of the reservoir by 6.6 ~ 8.2 %, and 1.7 ~ 16.8 %, respectively. The bypassing, however, showed a marginal effect on the control of TOC due to the increased algal biomass associated with the increased water retention time after bypassing as well as the lower TOC level of the effluent compared to the ambient reservoir water.

• 한국수정란이식학회지
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• 제28권2호
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• pp.87-93
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• 2013

The efficiency of artificial insemination (AI) for horses remains unsatisfactory. It is mainly because each process of AI causes a detrimental effect on semen quality. To sustain quality of semen properly, several factors including libido of stallions and sperm damage during sperm processing and preservation should be considered. Stallions with decent libido produce a high ratio of sperm to seminal plasma in their ejaculates, which is the ideal semen composition for maintaining sperm quality. Thus, to maximize the fertility rate upon AI, stallions should be appropriately managed to enhance their libido. Seminal plasma should have a positive effect on horse fertility in the case of natural breeding, whereas the effects of seminal plasma on both sperm viability and quality in the context of AI remain controversial. Centrifugation of semen is performed during semen processing to remove seminal plasma and to isolate fine quality sperm from semen. However, the centrifugation process can also result in sperm loss and damage. To solve this problem, several different centrifugation techniques such as Cushion Fluid along with dual and single Androcoll-E$^{TM}$ were developed to minimize loss of sperm and to damage at the bottom of the pellet. Most recently, a new technique without centrifugation was developed with the purpose of separating sperm from semen. AI techniques have been advanced to deliver sperm to optimal region of female reproductive tract at perfect timing. Recombinant equine luteinizing hormone (reLH) and low dose insemination techniques have been developed to maximize both fertility rate and the efficiency of AI. Horse breeders should consider that the entire AI procedure should be optimized for each stallion due to variation in individual horses for a uniformed AI protocol.

• Structural Engineering and Mechanics
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• 제76권2호
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• pp.269-278
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• 2020

In this paper, the mechanical characteristics of the open type hyperbolic-parabolic membrane structure under wind load were investigated. First, the numerical simulation of a typical plane membrane structure was performed based on the Large-Eddy Simulation method. The accuracy of the simulation method was validated by the corresponding wind tunnel test results. Then, the wind load shape coefficients of open type hyperbolic-parabolic membrane structures are obtained from the series of numerical calculations and compared with the recommended values in the "Technical Specification for Membrane Structures (CECS 158: 2015). Finally, the influences of the wind directions and wind speeds on the mean wind pressure distribution of open type hyperbolic-parabolic membrane structures were investigated. This study aims to gain a better understanding of the wind-induced response for this type of structure and be useful to engineers and researchers.

• 한국농공학회논문집
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• 제60권3호
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• pp.135-148
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• 2018

Reservoir sedimentation is a major environmental issue, and various sediment load controls and plans have been proposed to secure clean and safe water resources. The objectives of this study were to estimate soil loss in the upper basins and predict sediment deposition in Ipjang reservoir using hydrologic and hydraulic model. To do so, SWAT (Soil and Water Assessment Tool) and EFDC (Environmental Fluid Dynamics Code) was used to estimate soil loss in two upper basins and to predict spatial distribution and amount of sediment deposition in the Ipjang reservoir, respectively. The hydrologic modeling results showed that annual average soil loss from the upper basins was 500 ton. The hydraulic modeling results demonstrated that sediment particles transported to the reservoir were mostly trapped in the vicinity of the reservoir inlet and then moved toward the bank over time. If long-term water quality monitoring and sediment survey are performed, this study can be used as a tool for predicting the dredging amount, dredging location and proper dredging cycle in the reservoir. The study findings are expected to be used as a basis to establish management solutions for sediment reduction.

• 한국안전학회지
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• 제35권4호
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• pp.84-91
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• 2020

The Korean nuclear industry developed the SPACE (Safety and Performance Analysis Code for nuclear power plants) code and this code adpots two-phase flows, two-fluid, three-field models which are comprised of gas, continuous liquid and droplet fields and has a capability to simulate three-dimensional model. According to the revised law by the Nuclear Safety and Security Commission (NSSC) in Korea, the multiple failure accidents that must be considered for accident management plan of nuclear power plant was determined based on the lessons learned from the Fukushima accident. Generally, to improve the reliability of the calculation results of a safety analysis code, verification work for separate and integral effect experiments is required. In this reason, the goal of this work is to verify calculation capability of SPACE code for multiple failure accident. For this purpose, it was selected the experiment which was conducted to simulate a Multiple Steam Generator Tube Rupture(MSGTR) accident with Passive Auxiliary Feedwater System(PAFS) operation by Korea Atomic Energy Research Institute (KAERI) and focused that the comparison between the experiment results and code calculation results to verify the performance of the SPACE code. The MSGR accident has a unique feature of the penetration of the barrier between the Reactor Coolant System (RCS) and the secondary system resulting from multiple failure of steam generator U-tubes. The PAFS is one of the advanced safety features with passive cooling system to replace a conventional active auxiliary feedwater system. This system is passively capable of condensing steam generated in steam generator and feeding the condensed water to the steam generator by gravity. As the results of overall system transient response using SPACE code showed similar trends with the experimental results such as the system pressure, mass flow rate, and collapsed water level in component. In conclusion, it could be concluded that the SPACE code has sufficient capability to simulate a MSGTR accident.

• Journal of Korean Neurosurgical Society
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• 제48권3호
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• pp.199-206
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• 2010

Objective : Paraclinoid segment internal carotid artery (ICA) aneurysms have historically been a technical challenge for neurovascular surgeons. The development of microsurgical approach, advances in surgical techniques, and endovascular procedures have improved the outcome for paraclinoid aneurysms. However, many authors have reported high complication rates from microsurgical treatments. Therefore, the present study reviews the microsurgical complications of the extradural anterior clinoidectomy for treating paraclinoid aneurysms and investigates the prevention and management of observed complications. Methods : Between January 2004 and April 2008, 22 patients with 24 paraclinoid aneurysms underwent microsurgical direct clipping by a cerebrovascular team at a regional neurosurgical center. Microsurgery was performed via an ipsilateral pterional approach with extradural anterior clinoidectomy. We retrospectively reviewed patients' medical charts, office records, radiographic studies, and operative records. Results : In our series, the clinical outcomes after an ipsilateral pterional approach with extradural anterior clinoidectomy for paraclinoid aneurysms were excellent or good (Glasgows Outcome Scale : GOS 5 or 4) in 87.5% of cases. The microsurgical complications related directly to the extradural anterior clinoidectomy included transient cranial nerve palsy (6), cerebrospinal fluid leak (1), worsened change in vision (1), unplanned ICA occlusion (1), and epidural hematoma (1). Only one of the complications resulted in permanent morbidity (4.2%), and none resulted in death. Conclusion : Although surgical complications are still reported to occur more frequently for the treatment of paraclinoid aneurysms, the permanent morbidity and mortality resulting from a extradural anterior clinoidectomy in our series were lower than previously reported. Precise anatomical knowledge combined with several microsurgical tactics can help to achieve good outcomes with minimal complications.

• 지구물리와물리탐사
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• 제17권3호
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• pp.121-128
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• 2014

투과도는 다공질 암석 내에서 유체의 유동 특성을 나타내는 중요한 매개변수로서 일반적으로 코어 시료의 유체 유동실험을 통해 산출된다. 하지만, 유체 유동실험을 위해서는 별도의 실험장치가 필요하며, 투과도가 낮을 경우 많은 시간이 소요될 수 있다. 본 연구에서는 일련의 투과도 측정 실험 없이 시료의 건조과정만으로 투과도를 도출하기 위해 유체투과도, 공극률, 건조율간의 상관관게를 분석하였다. 공극률은 표면건조 포화시료를 건조시키면서 무게 변화를 연속적으로 측정하는 건조 모니터링 방법을 이용하여 산출하였으며, 건조율은 물 포화율에 따른 시료의 무게 변화율로부터 구했다. 70 ~ 670 mD의 투과도를 보이는 6개의 베레아 사암을 이용해 회귀분석한 결과 공극률 및 건조율로부터 다공성 사암의 투과도를 예측할 수 있는 새로운 경험식을 도출하였다.

• 한국임상수의학회지
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• 제25권4호
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• pp.314-316
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• 2008

급성 위확장은 실험시설에서 사육되고 있는 Macaca 원숭이에서 가장 흔하게 발생하는 응급상황 중에 하나이다. 이 보고서는 사육 원숭이에서 발생한 몇몇 증례를 소개하고자 한다. 급성 위확장증을 보인 원숭이들에는 실험을 위해 원숭이 보정의자에 앉힌 경우나 마취를 한 경우, 그리고 아무런 처치도 하지 않은 경우 등이 있었다. 이환된 동물들은 심한 복부팽만, 탈수, 청색증과 호흡곤란 등을 동반한 혼수 상태를 보였다. 한 증례는 전신장애로 인해 상태가 악화되고 폐사하여 부검을 실시하였다. 나머지 두 증례는 위관과 수액요법으로 응급처치를 한 결과 병증에서 회복되었다. 부검결과, 위의 대부분은 위내 가스와 물 그리고 섭취물로 채워져 있었다. 이 보고서는 영장류에서 급성위확장증의 발생과 관리에 대한 특별한 강조와 더불어 본 질환이 비 특이적인 원인에 의해 발생할 수 도 있음을 시사한다.

• 한국지리정보학회지
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• 제10권1호
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• pp.205-217
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• 2007

도심공동화를 단순히 상주인구나 유동인구의 감소, 상업기능의 쇠퇴 등만으로 보고 단편일률적인 방안을 제시하는 것은 또 다른 문제를 가져오게 된다. 그래서 본 연구에서는 부산시의 도심을 조사 분석하여, 그에 적합한 도심재생방안을 부산시의 특성을 고려하여 제시하는데 그 목적이 있다. 도심의 기능별 지역을 알기위해서 부산시의 도심에 속하는 15개 동을 대상으로 1996년, 2000년, 2004년 세 개 연도를 분석하여 도심의 공간적 특성과 도심공동화현상을 파악하고자 하였다. 이들지역에 20개의 변수를 선택하여 요인분석과 군집분석을 사용하였다. 각 연도별 주요요인은 각각 3개씩 나타났으며, 누적 설명력은 84.2%, 87.1%, 85.5%로 높게 나타났다. 그리고 이들 요인은 주거적 요인, 상업적 요인, 관리적 요인을 설명하는 성분으로 나타났다. 본 연구의 중요한 결과들은 다음과 같다. 첫째, 전체적인 기능별 도심공동화현상이 나타나고 있으므로 종합적인 도심재생방안의 모색이 시급하다고 할 수 있겠다. 둘째, 도심의 지역별 특성이 다르게 나타나고 있으므로 지역별 특성에 부합되는 도심재생방안이 수립되어야 하겠다.