• Maxillofacial Plastic and Reconstructive Surgery
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• 제40권
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• pp.42.1-42.5
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• 2018

Background: Fractures of the orbital wall are mainly caused by traffic accidents, assaults, and falls and generally occur in men aged between 20 and 40 years. Complications that may occur after an orbital fracture include diplopia and decreased visual acuity due to changes in orbital volume, ocular depression due to changes in orbital floor height, and exophthalmos. If surgery is delayed too long, tissue adhesion will occur, making it difficult to improve ophthalmologic symptoms. Thus, early diagnosis and treatment are important. Fractures of the superior orbital wall are often accompanied by skull fractures. Most of these patients are unable to perform an early ocular evaluation due to neurosurgery and treatment. These patients are more likely to show tissue adhesion, making it difficult to properly dissect the tissue for wall reconstruction during surgery. Case presentation: This report details a case of superior orbital wall reconstruction using superior orbital rim osteotomy in a patient with a superior orbital wall fracture involving severe tissue adhesion. Three months after reconstruction, there were no significant complications. Conclusion: In a patient with a superior orbital wall fracture, our procedure is helpful in securing the visual field and in delamination of the surrounding tissue.

• Journal of Chest Surgery
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• 제44권1호
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• pp.18-24
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• 2011

Background: We evaluated the efficacy of Cox-maze IV procedure using bipolar irrigated radiofrequency ablation and cryothermy in chronic atrial fibrillation associated with valvular heart disease. Material and Methods: From November 2005 to June 2009, ninety four patients have undergone valvular heart surgery with Cox-maze IV procedure. Preoperative duration of atrial fibrillation was $7.6{\pm}6.5$ years and follow-up duration was $22.7{\pm}12.3$ months. Results: There were two (2.1%) postoperative deaths not related to maze procedure. Two cerebrovascular accidents, five low cardiac output syndromes and two permanent pacemaker implantations have occurred after surgery. Preoperative ejection fraction on echocardiography was $55.3{\pm}8.1%$ and ejection fraction of postoperative six month was $54.7{\pm}6.5%$. Left atrial size of preoperative and postoperative were $61.5{\pm}11.6\;mm$ and $53.1{\pm}8.4\;mm$ at each. Freedom from atrial fibrillation rate at postoperative six-month was 80.7% and the cases of recurrence of atrial fibrillation after six months were three (3.3%). Risk factors for failure or recurrence of maze procedure were old age (p=.010) and preoperative moderate or severe tricuspid regurgitation (p=.033). Conclusion: The Cox-maze IV procedure using RFBP2 and cryothermy is quite safe and freedom from atrial fibrillation at postoperative 6 month was 82.5%. Risk factors for failure or recurrence of atrial fibrillation after Cox-maze IV were old age and preoperative over moderate tricuspid regurgitation.

• 비파괴검사학회지
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• 제36권1호
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• pp.45-52
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• 2016

고로는 제철소에서 철을 만들어 내는 핵심설비 중 하나로 고온고압 환경에서 냉각과 팽창으로 인한 철피의 손상이 노출되어 있어 대형사고에 대한 발생 가능성이 높아 중점관리가 필요하다. 본 연구에서는 음향방출법을 이용한 대형구조물 안전진단 시스템에 대한 평가를 수행하였다. 특히, 철피 크랙의 성장은 큰 에너지를 수반하게 되어, 음향방출 에너지 파라미터의 급격한 증가로 심각한 손상을 예측하였다. 이러한 결과를 바탕으로 고로의 정비시기를 앞당겨 확인한 결과 실제 크랙을 UT와 병행하여 확인하였다. 본 연구에서는 음향방출법을 이용한 대형 구조물인 철피균열의 심각도에 대한 평가기준을 마련하여 구조물 조기 결함진단 시스템의 활용으로 유용할 것으로 기대된다.

• 한국항해항만학회지
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• 제32권6호
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• pp.433-438
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• 2008

최근 광양항에서는 대규모 매립 및 부두 건설 공사와 화물수송을 위한 예부선의 통항이 증가하고 있고, 항만을 출입하는 선박들과 좁은 항로에서 마주치는 상태, 횡단상태 및 추월의 관계가 자주 발생하여 해양사고의 발생 가능성이 높아지고 있다. 이 연구에서는 광양항 중장기 항만개발에 기인한 해상교통량의 변화와 항로의 항해위험요소가 예부선의 안전운항에 미치는 영향에 대하여 검토하였다. 그리고 율촌 제1산업단지를 출입하는 예부선의 하이스코 임시항로 이용에 관하여 도선사와 해상교통관제센터의 관제사로 구성된 전문가극 대상으로 설문조사를 수행하였고, 이를 통하여 광양항 하이스코 임시항로를 출입하는 예부선의 안전운항 방안에 관하여 고찰하였다.

• 산업경영시스템학회지
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• 제38권4호
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• pp.193-201
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• 2015

Corporation's valuable intelligent asset is being threatened from the skills of threatening subject that has been evolved along with the growth of the information system and the amount of the information asset. Domestically, attempts of various private information attacks, important information extortion, and information damage have been detected, and some of them have abused the vulnerability of security of information system, and have become a severe social problem that generates security incident. When accessing to the security, most of companies used to establish a strategy with a consistent manner and a solution plan. However, this is not a proper way. The order of priorities vary depending on the types of business. Also, the scale of damage varies significantly depending on the types of security incidents. And method of reaction and critical control point vary depending on the types of business and security incidents. In this study, I will define the security incidents by their types and preponderantly examine how one should react to those security incidents. In this study, analyzed many types of security accidents that can occur within a corporation and an organization considering various factors. Through this analysis, thought about factors that has to be considered by corporations and organizations when they intend to access to the information security. This study focuses on the response methodology based on the analysis of the case analysis of the leakage of industrial secret and private secret other than the conceptual response methodology that examines the way to prevent the leakage of the industry security systems and the industry information activities. And based on these factors, want to be of help for corporations to apply a reasonable approach when they establish a strategy to information security.

• 대한두개안면성형외과학회지
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• 제19권4호
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• pp.270-274
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• 2018

Background: Nasal bone fractures occur frequently because the nasal bone is located at the forefront of the face. The goal of this study was to examine the cause, change in severity, change in incidence, and demographics of nasal bone fracture according to today's lifestyle. Methods: A total of 2,092 patients diagnosed as having nasal bone fractures at our department between 2002 and 2017 were included in this study. We retrospectively examined patients' medical records to extract information regarding age, sex, cause of injury, combined facial bone fractures, and related injuries such as skull base fracture, spinal cord injury, brain hemorrhage, and other bone fractures. Fracture severity was classified by nasal bone fracture type. Results: No statistically significant difference was found in annual number of patients treated for nasal bone fracture. The proportion of patients who underwent closed reduction was significantly decreased over time for those with nasal bone fractures caused by traffic accidents. However, it was not significantly changed for those with nasal bone fractures due to other causes. The number of patients with combined facial bone fractures increased over time. Incidences of severe nasal bone fracture also increased over time. Conclusion: The study suggested that there is a decrease in the frequency and increase in the severity of nasal bone fracture due to traffic accident. Many protective devices prevent nasal bone fractures caused by a small amount of external force; however, these devices are not effective against higher amounts of external force. This study highlights the importance of preoperative thorough evaluation to manage patients with nasal bone fractures due to traffic accident.

• 대한한의학회지
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• 제39권4호
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• pp.62-73
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• 2018

Objectives: This study conducted a retrospective review to compare the effectiveness of herbal medicine, while confirming the effectiveness of Korean medicine (KM) in traffic accidents (TA). Methods: We investigated the medical records of TA patients who were hospitalized at Muuido Korean medicine hospital from January 2016 to June 2018 retrospectively. Medical records included general characteristics (Gender, age), TA & treatment-related information (Collision type, chief complaint, hospitalization period, and herbal medicine prescription), and clinical scales (Five-scale improvement, numerical rating scale (NRS)). Statistical analysis was performed for data distribution and effectiveness comparison. Results: 755 TA patients showed 0.78:1 gender ratio. 20-50s years old, rear collision, pain in the cervical and lumbar spine, and hospitalization period within 14 days were the majority. KM improved 83.18% of 755 TA patients' symptoms and ROM over 'improvement' level, which indicated 30-70% improvement. With common KM treatments including acupuncture, cupping, heat therapy, and manipulation therapy, TA patients received various herbal medicines and herbal medicine for breaking severe blood stasis (Tongdo-san) showed improvement in both five-scale improvement and NRS change at the same time. Conclusions: We could confirm the effectiveness of KM, particularly herbal medicine in TA. It would be necessary to develop new herbal medicines such as Tongdo-san to treat TA-related symptoms.

• Nuclear Engineering and Technology
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• 제51권6호
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• pp.1514-1524
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• 2019

Hydrogen-steam gas mixture may be injected into containment with flow regime varying both spatially and transiently due to wall effect and pressure difference between primary loop and containment in severe accidents induced by loss of coolant accident. Preliminary CFD analysis is conducted to gain information about the helium flow regime transition process from jet to buoyancy plume for forthcoming experimental study. Physical models of impinging jet and wall condensation are validated using separated effect experimental data, firstly. Then helium transportation is analyzed with the effect of jet momentum, buoyancy and wall cooling discussed. Result shows that helium distribution is totally dominated by impinging jet in the beginning, high concentration appears near gas source and wall where jet momentum is strong. With the jet weakening, stable light gas layer without recirculating eddy is established by buoyancy. Transient reversed helium distribution appears due to natural convection resulted from wall cooling, which delays the stratification. It is necessary to concern about hydrogen accumulation in lower space under the containment external cooling strategy. From the perspective of experiment design, measurement point should be set at the height of connecting pipe and near the wall for stratification stability criterion and impinging jet modelling validation.

• 한국재료학회지
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• 제29권1호
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• pp.11-15
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• 2019

Severe wall thinning is found on the tube of a low-pressure evaporator(LPEVA) module that is used for a heat recovery steam generator(HRSG) of a district heating system. Since wall thinning can lead to sudden failure or accidents that lead to shutdown of the operation, it is very important to investigate the main mechanism of the wall thinning. In this study, corrosion analysis associated with a typical flow-accelerated corrosion(FAC) is performed using the corroded tube connected to an upper header of the LPEVA. To investigate factors triggering the FAC, the morphology, composition, and phase of the corroded product of the tube are examined using optical microscopy, scanning electron microscopy combined with energy dispersive spectroscopy, and x-ray diffraction. The results show that the thinnest part of the tube is in the region where gas directly contacts, revealing the typical orange peel type of morphology frequently found in the FAC. The discovery of oxide scales containing phosphate indicates that phosphate corrosion is the main mechanism that weakens the stability of the protective magnetite film and the FAC accelerates the corrosion by generating the orange peel type of morphology.

• Nuclear Engineering and Technology
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• 제53권1호
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• pp.178-187
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• 2021

Dual-cooled annular fuel allows a significant increase in power density while maintaining or improving safety margins. However, the dual-cooled design brings much higher Zircaloy charge in reactor core, which could cause a great threaten of hydrogen explosion during severe accidents. Hence, an innovative fuel combined dual-cooled annular geometry and SiC cladding was proposed for the first time in this study. Capabilities of fuel design and behavior simulation were developed for this new fuel by the upgrade of FROBA-ANNULAR code. Considering characteristics of both SiC cladding and dual-cooled annular geometry, the basic fuel design was proposed and preliminary proved to be feasible. After that, a design optimization study was conducted, and the optimal values of as-fabricated plenum pressure and gas gap sizes were obtained. Finally, the performance simulation of the new fuel was carried out with the full consideration of realistic operation conditions. Results indicate that in addition to possessing advantages of both dual-cooled annular fuel and accident tolerant cladding at the same time, this innovative fuel could overcome the brittle failure issue of SiC induced by pellet-cladding interaction.