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A Survey of Information Security Risk Analysis Methods
Armaghan Behnia,Rafhana Abd Rashid,Junaid Ahsenali Chaudhry 한국산학기술학회 2012 SmartCR Vol.2 No.1
There are already many models of risk assessment and more are emerging every day. They all have the same fundamental target, but most attempt to hit the target from very different approaches. Some approaches can be applied to all types of risk, while others are specific to particular risks. A particularly dangerous risk in the global economy today is the security of information. Information is a key asset for organizations, and reducing the risk of information compromise is a high priority. This study proposed a methodology for information security risk analysis in which the assets, vulnerabilities, threats, and controls of an organization are linked. The main purpose of the study is to compare and clarify the different activities, inputs, and outputs required by each model of information security risk assessment and the analysis that effectively addresses the risks of information security. At the moment, there are numerous risk analysis methodologies available, some of which are qualitative while others are more quantitative in nature. These methodologies have a common goal to estimate the overall value of risk. An organization must choose the most proper methodology based on their specific requirements.
[論文] Numerical Experiment for Compressible Effects around a Butterfly Valve
김철호(C.H.Kim),M.Behnia(M.Behnia),B.E.Milton(B.E.Milton) 한국자동차공학회 1993 오토저널 Vol.15 No.2
내연기관의 혼합 가스 생성 장치로 홉입되는 공기의 유량을 조절하기 위해 Butterfly 밸브가 사용된다. 이밸브는 유량의 제어에는 매우 유용한반변, 밸브 후면에서의 복잡한 공기의 유동 현상[6]으로 인하여 혼합가스의 생성에 장해적인 요소를 제공하기도 한다. 특히 밸브가 많이 닫힌 상태에서는 밸브와 관로벽 사이의 간격이 좁아지는 Throttling 현상으로 인하여, 엔진에 고 부하시 흡입되는 공기의 양이 증가하게 되어, 밸브 주위에서 공기 속도의 급증으로 인하여 유동장의 압축성 형상을 기대할수 있다. Throttl의 Choking 현상으로 인하여 공기의 입자는 운동에너지를 잃게 되고, 궁극적 혼합가스의 생성에 영향을 미쳐 엔진성능의 저하를 초래하게 된다. <br/> 본 연구에서는 실제 엔진(Central Fuel Injection Engine, 5 liters) [1]의 흡인 manifold를 model-ling하여, 특히 밸브가 많이 닫힌 상태에서, 밸브 주위에서의 난류 유동의 압축성 현상을 정량적으로 분석해 보았다.
[論文] Computation of the Flow Field around a Butterfly Valve
김철호(C.H.Kim),최정명(J.M.Choi),M.Behnia(M.Behnia),B.E.Milton(B.E.Milton) 한국자동차공학회 1992 오토저널 Vol.14 No.1
대도시의 자동차 배기가스에 의한 대기오염문제는 날로 심화되어 가고 있으며, 그 규제 역시 매우 엄격해지고 있다.<br/> 배기가스의 문제는 연소실내에서의 고효율연소에 의해 개선될 수 있으며, 이를 위해서는 혼합가스 생성장치에서의 잘 미립화된 혼합가스의 생성에 관한 미지적 연구가 필수적이다.<br/> 본 연구에서는 범용 유체 유동해석, 프로그램을 이용하여 Butterfly 밸브 주위에서의 공기의 흐름현상을 예측하였으며, 밸브의 손실계수(Kv)를 심험치와 비교하여 보았다. 또한 압축성과 비압축성 유체 유동해석의 비교, Residual Mass(R.M)의 최적치 정의에 의한 CPU 시간의 최소화, Numerical Grid Size의 해석결과에 미치는 영향 등에 관해 알아보았다.
Bio-inspired Green Power: A Thermocurrent Generator
Prisa Hosseinnezhad,Sohrab Behnia,Samira Fathizadeh 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.3
Recently, there is a developing trend of using renewable bio-based materials as an energy storing device. Biomaterials are environmentally friendly as they do not contain chemical products, they operate silently due to the lack mechanical structures and/or moving parts. Throughout the present paper, we have theoretically modeled a photosynthetic system attached to the quantum thermostat. The results determine creating the thermocurrent and the corresponding electrical potential up to 0.3 V. The temperature gradient effect has been investigated since the temperature has a key role in the system performance. To ensure that the system is stable and shows the delocalized behavior in these characteristic points, the level spacing distribution P ( s ) and multifractal f ( ) analysis have been investigated too. The Poisson behavior of P ( s ) and wide f ( ) represent the stable and delocalized photosynthesis complex. Also, the Seebeck coefficient which can quantify the thermoelectric effect is about 5 mV/K for our chlorosome based thermophore.
Air to air fixed plate enthalpy heat exchanger, performance variation and energy analysis
Mohammad Shakir Nasif,Rafat Al-Waked,Masud Behnia,Graham Morrison 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.11
The thermal performance of a Z shape enthalpy heat exchanger utilising 70gsm Kraft paper as the heat and moisture transfer surface has been investigated. Effects of different inlet air humidity ratio conditions on the heat exchanger effectiveness and on the energy recovered by the heat exchanger have been the main focus of this investigation. A typical air conditioning cooling coil which incorporates an enthalpy heat exchanger has been modelled for tropical climate. Under test conditions, results have shown that latent effectiveness and the moisture resistance coefficient have strong dependency on the inlet air humidity ratio. Moreover, the latent effectiveness has been found to be strongly dependent on the moisture resistance coefficient rather than the convective mass transfer coefficient. Finally, annual energy analysis for Singapore weather conditions have also shown that energy recovered under variable inlet air conditions is 15% less than that recovered under constant inlet air conditions for the same heat exchanger.