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조두호(Cho Doo Ho),현규섭(Hyun Kyu Sub),강영일(Kang Young Il),김종욱(Kim Jong Wook),김종범(Kim Jong Beom) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
Since the implementation of ‘The Indoor Air Quality Management Act in Multi-use Facilities’ in 2004, heat recovery ventilation devices(substitute ‘heat exchangers’) have been applied to apartments with more than 100 households additional legislation and announcements have been made such as ‘Standards of Management and Certification of Housing Performance Ratings’ and ‘Regulations on Promoting the Supply of High-efficiency Energy Equipment’. The current ventilation system of the heat exchanger is generally, as in Fig.1, consumes unnecessary energy because it only has a simple on/off for all rooms regardless of indoor air quality. But complaints requesting ventilation function for the particular room have been continuously raised to Ministry of Land, Infrastructure and Transport Affairs and as the aim of the government policy has changed into passive house and zero energy house and interests of consumers in environmental sector such as fine dust are increasing, the need for technology development for ventilation control systems capable of energy saving and each room control such as Fig.2 is increasing in the heat In this study, we propose a technology called "Each Room Control Ventilation System with Air Cleaning Function’
조두호,서장훈,Cho Doo Ho,Seo Jang Hoon 대한안전경영과학회 2005 대한안전경영과학회지 Vol.7 No.3
Many researchers have proved that risk measurement of information systems is a very effective tool for improving confidence of information systems. However, information system risk in Korea still includes many subjective judgements. This study deals with applying a quantitative model to improve risk measurement of information system quality. First of all, we have come up with solutions to improve the evaluation efficiency on risk measurement. We have merged the risk guidelines of COBIT and CMM, and developed a quantified evaluation scheme that call by risk point. We have proved the validity of this model by interviews with experts and by case studies.
조두호,서한범,최재붕,허남수,최영환,Cho, Doo Ho,Surh, Han Bum,Choi, Jae Boong,Huh, Nam Su,Choi, Young Hwan 한국압력기기공학회 2013 한국압력기기공학회 논문집 Vol.9 No.1
In this paper, W-DCAP-HTR(Web-based Design Compatibility Assessment Program for High Temperature Reactor) which will be used to check the design criteria for high temperature reactor is newly proposed. To do this, the assessment procedure of the ASME Sec.III Div.5 such as time-dependent primary stress limit, accumulated inelastic strain, and creep-fatigue damage evaluation were investigated. Furthermore, the trend of candidate materials for high temperature reactor was also reviewed. Then, all assessment procedures for high temperature reactor have been computerized to enhance the efficiency and to reduce the possibility of human error during calculating procedure by hand calculation. It can be directly conducted by adopting the actual thermal and structural analysis results. The validation of W-DCAP-HTR has been demonstrated by benchmark analysis.
조두호(Doo-Ho Cho),김종민(Jong-Min Kim),장윤석(Yoon-Suk Chang),최재붕(Jae-Boong Choi),김영진(Young-Jin Kim),한상인(Sang-In Han) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.11
During the last decade, possibility of flaw occurrences has been rapidly increased world-widely as the increase of operating times of petro-chemical facilities. For instance, from a recent in-service inspection, three different sized surface cracks were detected in welding parts of a spherical oxygen holder in Korea. While API579 code provides corresponding engineering assessment procedures to determine crack driving forces, in the present work, numerical analyses are carried out for the cracked oxygen holder to investigate effects of complex geometry, analysis model and residual stress. With regard to the detailed finite element analysis, stress intensity factors are determined from both the full three-dimensional model and equivalent plate model. Also, as an alternative, stress intensity factors are calculated for equivalent plate model by employing the noted influence stress function technique. Finally, parametric structural integrity evaluation of the cracked oxygen holder is conducted in use of failure assessment diagram method, J/T method and DPFAD method. Effects of the geometry and so forth are examined and key findings from the simulations are fully discussed, which enables to determine practical safety margins of spherical components containing a defect.