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차량 종류 및 운전자 인지반응 시간을 이용한 LDWS 경고 특성에 관한 연구
박환서,장경진,유송민,Park, Hwanseo,Chang, Kyungjin,Yoo, Songmin 한국자동차안전학회 2016 자동차안전학회지 Vol.8 No.1
More than 80 percent of traffic accidents related with lane departure believed to be the result of crossing the lane due to either negligence or drowsiness of the driver. Lane-departure related accident in the highway usually involve high fatality. Even though LDWS is believed to prevent accident 25% and reduce fatalities by 15% respectively, its effectiveness in performance is yet to be confirmed in many aspects. In this study, the vehicle lateral locations relative to warning zone envelop (earliest and latest warning zone) defined in ISO standard, ECE and NHTSA regulations are compared with respect to various factors including delays, vehicle speed and vehicle heading angle with respect to the lane. Since LDWS is designed to be activated at the speed over 60 km/h, vehicle speed range for the study is set to be from 60 to 100 km/h. The vehicle heading angle (yaw angle) is set to be up to 5 degree away from the lane (abrupt lane change) considering standard for lane change test using double lane-change test specification. The TLC is calculated using factors like vehicle speed, yaw angle and reaction time. In addition, the effect of vehicle type and reaction time have been considered to assess LDWS safety.
박환서,유송민,이동규,이위로,노대호 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
A machining processes for flange panel has been introduced. Contrary to the conventional methods like Y forming and welding, roll-seaming method has been utilized for better quality and less cost. Several measurement methods including digital image processing have been used to confirm the product quality assurance.
박환서,이홍국,노대호,박용배,유송민 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
The purpose of this study is to enhance the gear tooth machining process outcome by identifying the correlation between the product qualityand machining condition. A surface profilometer exclusively used for tracing and extracting key characteristic parameters from the gear tooth surface profile is facilitated. In order to replicate the professional gear tooth machining process, a cylindrical grinding machine was used. Separate approaches using two types of surface roughness measurement machines are introduced to characterize the product surface. Tentative results revealed that chatter could be observed in higher cutting speed or in poor gripper condition. A neural network tool was used to define optimal process condition area for best process output quality.
박환서,김인태,김환영,유승곤,김준형,Park Hwan Seo,Kim In Tae,Kim Hwan Young,Ryu Seung Kon,Kim Joon Hyung 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.1
This study suggested a new method for the solidification of molten salt waste generated from the electro-metallurgical process in the spent fuel treatment. Using binary material system, sodium silicate and phosphoric acid, metal chlorides were converted into metal phosphate in the micro-reaction module formed by SiO$_{2} particles. The volatile element in the reaction module would little vaporized below 1100$^{circ}$C After the gel product was mixed with borosilicate glass powder and thermally treated at 1000$^{circ}$C, li exists as Li$_{3}$PO$_4$ separated from glass phase and, Cs and Sr would be incorporated into an amorphous phase from XRD analysis. In case of the addition of ZrCl$_{4}$ to the binary system, the gel products were transformed into NZP structure considered as an prospective ceramic waste form after heat-treatment above 700 $^{circ}$C. From these results, the gel-route pretreatment can be considered as an effective approach to the solidincation of molten salt waste by the confirmed process or waste form and this also would be an alternative method on the ANL method using zeolites in USA by the confirmation of its chemical durability as an future work.
박환서,김인태,김환영,김준형,Park, Hwan-Seo,Kim, In-Tae,Kim, Hwan-Young,Kim, Joon-Hyung 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.3
This study suggested a new method to stabilize molten salt wastes generated from the pyre-process for the spent fuel treatment. Using conventional sol-gel process, $SiO_2-Al_2O_3-P_2O_5$ (SAP) inorganic material that is reactive to metal chlorides were prepared. In this paper, the reactivity of SAP with the metal chlorides at $650{\sim}850$, the thermal stability of reaction products and their leach-resistance under the PCT-A test method were investigated. Alkali metal chlorides were converted into metal aluminosilicate($LixAlxSi1-_xO_{2-x}$) and metal phosphate($Li_3PO_4\;and\;Cs_2AlP_3O_{10}$) While alkali earth and rare earth chlorides were changed into only metal phosphates ($Sr_5(PO_4)_3Cl\;and\;CePO_4$). The conversion rate was about $96{\sim}99%$ at a salt waste/SAP weight ratio of 0.5 and a weight loss up to $1100^{\circ}C$ measured by thermogravimetric analysis were below 1wt%. The leach rates of Cs and Sr under the PCT-A test condition were about $10^{-2}g/m^2\;day\;and\;10^{-4}g/m^2\;day$. From these results, it could be concluded that SAP can be considered as an effective stabilizer for metal chlorides and the method using SAP will give a chance to reduce the volume of salt wasteform for the final disposal through further researches.