• Membrane and Water Treatment
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• v.6 no.6
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• pp.477-488
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• 2015

This study demonstrates that low pressure membranes are the ideal choice for industrial and/or municipal wastewater treatment by showing some promising experimental results, understanding different membrane filtration models, studying the potential of membrane bioreactors (MBRs), considering ceramic membranes fabrication and illustrating the role of nanotechnology in membranes. Cost study calculations are included to determine the treatment cost as well as the initial cost of various membrane types. Results showed that integrated membranes are preferred over MBR in case of average capacities. However, higher capacity situations are the most economical choice for MBR. It is shown that the least treatment cost in MBR was about $0.13/m^3$. However, the $0.13/m^3$ is the theoretical cost which is very small compared to the actual average MBR treatment cost of $0.5/m^3$.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.550-553
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• 2018

소프트웨어 시험 후 발견된 결함을 제거하기 위해서는 먼저 해당 결함의 위치를 정확히 찾아야 한다. 결함의 위치를 찾는 작업은 많은 양의 소스코드를 검토해야 하기 때문에 많은 노력을 요구한다. 해당 노력을 줄이기 위해 슬라이싱 기법, 스펙트텀 기법, 모델 기반 기법 등 많은 기법들이 연구되었다. 하지만 이들 연구들은 결함 위치로 추정한 탐색 영역의 범위가 넓어 결과의 효과가 떨어지는 단점이 있다. 그래서 결함 위치 추정의 정확도를 높이고 결함 위치 파악의 효과를 높이기 위해 본 논문은 프로그램 소스 코드 문장에 대한 시험 케이스의 커버리지 정보, 시험의 PAss/Fail 여부, Define-Use의 관계에 있는 문장 정보를 활용하여 각 문장의 결함 의심도를 산출하는 방법을 제안한다. 제안 방법을 실험을 통하여 확인한 결과, 낮은 지역화 비용으로 결함 위치 추정을 할 수 있었다.

• Computers and Concrete
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• v.30 no.1
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• pp.33-42
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• 2022

Experimentally predicting the compressive strength (CS) of concrete (for a mix design) is a time-consuming and laborious process. The present study aims to propose surrogate models based on Support Vector Machine (SVM) and Gaussian Process Regression (GPR) machine learning techniques, which can predict the CS of concrete containing nano-silica. Content of cement, aggregates, nano-silica and its fineness, water-binder ratio, and the days at which strength has to be predicted are the input variables. The efficiency of the models is compared in terms of Correlation Coefficient (CC), Root Mean Square Error (RMSE), Variance Account For (VAF), Nash-Sutcliffe Efficiency (NSE), and RMSE to observation's standard deviation ratio (RSR). It has been observed that the SVM outperforms GPR in predicting the CS of the concrete containing nano-silica.

• Advances in aircraft and spacecraft science
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• v.9 no.3
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• pp.243-261
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• 2022

Broad writing on the examination of sandwich structures mirrors the significance of incorporating thermal loadings during their investigation stage. In the current work, an endeavor has been made to concentrate on sandwich FGM beams' bending behaving under thermal loadings utilizing shear deformation theory. Temperature-dependent material properties are used during the analysis. The formulation includes the transverse displacement field, which helps better predict the behavior of thick FGM beams. Three-different thermal profiles across the thickness of the beam are assumed during the analysis. The study has been carried out on both symmetric and unsymmetric sandwich FGM beams. It has been observed that the bending behavior of sandwich FGM beams is impacted by the temperature profile to which it is subjected. Power-law exponent and thickness of core also affect the behavior of the beam.

• Structural Engineering and Mechanics
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• v.85 no.2
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• pp.217-231
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• 2023

The bending analysis of sandwich functionally graded (FG) beams under temperature circumstances is performed in this article utilizing Navier's solution-based parabolic shear deformation theory. For the first time, a comparative study has been carried out between the exponential and sigmoidal sandwich FGM beams under thermal conditions. During this investigation, temperature-dependent material characteristics are postulated. Both symmetric and unsymmetric sandwich examples have been studied. The effect of gradation law, gradation coefficient, and thickness scheme on beam behavior has been thoroughly investigated. Three possible temperature combinations at the top and bottom surfaces of the beam are also investigated. Beams with a higher proportion of ceramic to metal are shown to be more resistant to thermal stresses than beams with a higher proportion of metal.

• Explosives and Blasting
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• v.18 no.4
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• pp.61-68
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• 2000

본 기사는 2000년 3월 26일 미국 시애틀 소재 Kingdome 체육관 시설을 발파해체공법을 이용하여 해체한 사례로서 The Journal of Explosives Engineering(v.17 n.5, 2000)에 기고한 Dr. Douglas A. Anderson (Senior Consultant, West Chester, PA office of Schnabel Engineering Associates, Inc.)의 글을 옮긴 것이다. Kingdome 구조물의 해체와 해제 후 Seahawk Stadium 건설의 책임을 맡은 주계약자는 Turner Construction 회사이며 발파해체 사전준비 및 사후처리의 택일은 Aman Environment사, 발파해체 설계 및 시공은 CDI사, 주위 주요 구조물에 대한 영향평가 및 진동계측은 Schnabel Engineering Associates사가 맡아 수행하였다. 이 건물은 세계에서 가장 큰 규모의 쉘 콘크리트 돔 구조로 되어 있으며, 주위에 주요 구조물들이 위치하고 있고 특히 이 지역에 과거 발생했던 지진으로 인하여 주민들이 지반진동에 대한 피해나 또는 지진을 유발하수도 있다는 위험 가능성에 매우 예민하여 관심이 높았던 해체사례이다. 이 구조물을 한번에 붕괴시킬 경우 지반에 25,000톤의 중량이 충격으로 작용할 수 있으므로 충격을 최소화하기 위한 방법에 초점을 맞추어 설계되었으며 5,905개의 천공에 4,728파운드(약 2,145kg)의 폭약이 사용되었고 도폭선을 이용하여 기폭시켰다. 사용된 도폭선의 길이는 약 37.9 Km에 달하였다. 발파해체 기사에 나타나 있듯이 주위에 피해를 주지 않고 성공적으로 수행되었다.

• Journal of Information Science Theory and Practice
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• v.11 no.4
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• pp.14-39
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• 2023

Cybercrime is a significant threat to Internet users, involving crimes committed using computers or computer networks. The landscape of cyberspace presents a complex terrain, making the task of tracing the origins of sensitive data a formidable and often elusive endeavor. However, tracing the source of sensitive data in online cyberspace is critically challenging, and detecting cyber-criminals on the other hand remains a time-consuming process, especially in social networks. Cyber-criminals target individuals for financial gain or to cause harm to their assets, resulting in the loss or theft of millions of user data over the past few decades. Forensic professionals play a vital role in conducting successful investigations and acquiring legally acceptable evidence admissible in court proceedings using modern techniques. This study aims to provide an overview of forensic investigation methods for extracting digital evidence from computer systems and mobile devices to combat persistent cybercrime. It also discusses current cybercrime issues and mitigation procedures.

• Journal of Cerebrovascular and Endovascular Neurosurgery
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• v.26 no.3
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• pp.331-337
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• 2024

This is a unique case of metastatic pheochromocytoma of the cervical spine treated with preoperative embolization and subsequent en bloc resection. A 65-year-old man with metastatic pheochromocytoma presented with two weeks of worsening neck pain, left arm and leg weakness and paresthesia, and urinary incontinence. Magnetic resonance imaging showed a metastatic osseous lesion at C6 with severe stenosis and spinal cord compression. The patient underwent successful preoperative angiographic embolization with a liquid embolic agent followed by C5-C7 laminectomy, en bloc tumor resection, and C3-T2 posterior spinal fusion. Six weeks postoperatively, the patient reported improving strength and resolving neck pain and paresthesias. While there is no standard paradigm for the treatment of metastatic pheochromocytomas of the cervical spine, preoperative embolization may minimize intraoperative blood loss and hemodynamic instability during subsequent surgical resection.

• Journal of Cerebrovascular and Endovascular Neurosurgery
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• v.26 no.1
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• pp.65-70
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• 2024

We present a case of intracranial aneurysm located in the P1 segment of left posterior cerebral artery in the context of tetralogy of Fallot. Complex variations included right aortic arch with abnormal branching. Also, the bilateral vertebral arteries were absent, with a type I persistent proatlantal intersegmental artery of the left side. The aneurysm was treated with endovascular intervention with a Tubridge flow diverter and was noted to be completely cured on 6-month follow-up. We discuss the many considerations in this patient including developmental and modern-era treatment.

• Asian-Australasian Journal of Animal Sciences
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• v.11 no.5
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• pp.545-549
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• 1998

The influence of refeeding with either vitamin, mineral, fibre of water on protein synthesis and mRNA content in the liver and breast muscle of fasted chicks was investigated. At 15 d of age, chicks were fasted for 2 d and then refed either vitamin, mineral, fibre or water. The fractional synthesis rate (FSR) of protein was measured after 30 min of refeeding by using a large dose injection of L - 2, $6[^3H]$ phenylalanine. In the liver, FSR was reduced by fasting and tended to increase but not significantly by refeeding with vitamin or mineral. FSR was not affected by refeeding with fibre or water. There was no influence of fasting and refeeding on ribosomal capacity (the RNA : protein ratio) and ribosomal efficiency (total protein synthesised per total RNA). The absolute synthesis rate (ASR) of liver protein and hepatic mRNA content were reduced by fasting and unchanged by refeeding. In the muscle, FSR, ASR and mRNA content were significantly decreased by fasting and not recovered by refeeding with either vitamin, mineral, fibre or water. It concluded that vitamin, mineral, fibre and water have little capacity to stimulate liver and muscle protein synthesis reduced by fasting.