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김종도(Jong-Do Kim),윤문철(Moon-Chul Yoon) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In the paper, a new end-milling force model was suggested by considering run-out and it was compared with real case of end-milling process. An experimental coefficient modelling method was used for the formulation of theoretical end-milling force by considering the specific cutting force coefficient. The end-milling force mechanics with run-out was presented for theoretical force model in simple end-milling operations by considering the geometric shape of the workpiece part.
사우디아라비아 슈라의회에 관한 연구 -의회역사와 의회법 분석을 중심으로-
김종도 ( Jong Do Kim ) 한국외국어대학교 중동연구소 2014 중동연구 Vol.32 No.3
The purpose of this paper is to conduct a study on the history and role of the Shura` Council of the Kingdom of Saudi Arabia. The Shura` Council is a formal advisory body to the king of the Kingdom of Saudi Arabia. Although unable to exercise a legislative power yet, it studies laws, and proposes drafting a new law or amending an enacted law. By analyzing the history and role of the Shura` Council, this paper attempts to look into how the Council functions within the legal and social frame of the Kingdom of Saui Arabia.
$6mm^t$조선용 프라이머 코팅강판의 $CO_2$레이저 용접성 (II) - 레이저 용접현상의 동적거동과 기공 및 증발입자의 조성 -
김종도,박현준,Kim, Jong-Do,Park, Hyun-Joon 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.2
It has been reported that good quality weld beads are not easily obtained during the $CO_2$ CW laser welding of primer coated plate. However, by introducing a small gap clearance in the lap position, the zinc vapor can escape through it and sound weld beads can be acquired. Therefore, this study examines for keyhole behavior by observing the laser-induced plasma and investigates the relation between keyhole behavior and formation of weld defect. Laser-induced plasma has accompanied with the vaporizing pressure of zinc ejecting from keyhole to surface of primer coated plate. This dynamic behavior of plasma was very unstable and this instability was closely related to the unstable motion of keyhole during laser welding. As a result of observing the composition of porosity, much of Zn element was found from inner surface of porosity. But Zn was not found from the dimple structure fractured at the weld metal. By analyzing of vaporizing element in laser welding, a component ratio of Zn was decreased by introducing a small gap clearance. Therefore we can prove that the major cause of porosity is the vaporization of primer in lap position. Mechanism of porosity-formation is that the primer vaporized from the lap position accelerates dynamic behavior of the key hole and the bubble separated from the key hole is trapped in the solidification boundary and romaines as porosity.
김종도(Kim, Jong-Do) 한국중동학회 2010 韓國 中東 學會 論叢 Vol.31 No.1
In this paper, I would like to compare the Perception of Christianity & Islam regarding Sin. Christianity and Islam agree on the definition of sin. They consider that sin results from disobeying God's word or obeying Satan's word. But there is a difference in the understanding of original sin, which the progenitors of human race, Adam and Eve, had committed. According to the Christianity, it is said that they had committed the sin, by eating the fruit of the tree of knowledge of good and evil. For this sin, Adam and Eve were exiled from Eden. So original sin has been inherited to descendants of humankind. But Islam insists that there is no room for intervening in original sin because Adam was forgiven by Allah. How can we keep ourselves innocent in a sinful world? This is the reason why Christianity and Islam should reply to this proposition.
질화규소 세라믹의 레이저 예열선삭에 관한 연구 (III) - SSN 및 HIPSN의 예열선삭시 절삭력 및 공구수명의 특성 -
김종도,이수진,강태영,서정,이제훈,Kim, Jong-Do,Lee, Su-Jin,Kang, Tae-Young,Suh, Jeong,Lee, Jae-Hoon 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.6
Generally, ceramic material is very difficult to machine due to high strength and hardness. However, ceramic material can be machined at high temperature by plastic flow as metallic material due to the deterioration of the grain boundary glassy phase. Recently, a new method was developed to execute cutting process with CBN cutting tool by local heating of surface with laser. There are various parameters in LAM because it is a complex process with laser treatment and machining. During laser assisted machining, high power results in reducing of cutting force and increasing tool life, but excessive power brings oxidation of the surface. The effect of laser power, feed rate, cutting depth and etc. were investigated on the life of cutting tool. Chips were observed to find out suitable machining conditions. Chips of SSN had more flow-types than HIPSN. It means SSN is easier to machining. The life of cutting tool was increased with increasing laser power and decreasing feed rate and cutting depth.
질화규소 세라믹의 레이저 예열선삭에 관한 연구 (I) - 공정변수에 따른 질화규소의 예열특성 및 산화거동 -
김종도,이수진,서정,이제훈,Kim, Jong-Do,Lee, Su-Jin,Shu, Jeong,Lee, Jae-Hoon 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.4
Silicon nitride is widely used as an engineering ceramics because it has high strength, abrasion resistance and corrosion resistance even at high temperature. However, machining of silicon nitride is difficult due to its high hardness and brittleness. Laser assisted machining(LAM) allows effective cutting using CBN tool by locally heating the cutting part to the softening temperature of YSiAlON using the laser beam. The effect of preheating depending on process parameters were studied to find out the oxidation mechanism. If silicon nitride is sufficiently preheated, the surface is oxidized and $N_2$ gas is formed and escapes from the material, thereby making the cutting process more advantageous. During laser preheating process before machining, high temperature results in strong oxidation which makes the bloating, silicate layers and micro cracks. Using the results of these experiments, preheating characteristics and oxidation behavior were found out.
질화규소 세라믹의 레이저 예열선삭에 관한 연구 (II) - 예열선삭된 SSN 및 HIPSN 질화규소 세라믹의 표면특성 -
김종도,이수진,강태영,서정,이제훈,Kim, Jong-Do,Lee, Su-Jin,Kang, Tae-Young,Suh, Jeong,Lee, Jae-Hoon 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.5
This study focused on laser assisted machining (LAM) of silicon nitride ceramic that efficiently removes the material through machining of the softened zone by local heating. The effects of laser-assisted machining parameters were studied for cost reduction, and active application in processing of silicon nitride ceramics in this study. Laser assisted machining of silicon nitride allows effective cutting using CBN tool by local heating of the cutting part to the softening temperature of YSiAlON using by the laser beam. When silicon nitride is sufficiently preheated, the surface is oxidized and decomposed and then forms bloating, micro crack and silicate layer, thereby making the cutting process more advantageous. HIPSN and SSN specimens were used to study the machining characteristics. Higher laser power makes severer oxidation and decomposition of both materials. Therefore, HIPSN and SSN specimens were machined more effectively at higher power.
측면 충돌대응 LSHC(LS B PLR +H COMPLEX) 구조 최적화 개발
김도회(Do Hoi Kim),김해웅(Hae Yung Kim),박창호(Chang Ho Park),김종수(Jong Su Kim),이선우(Sun Woo Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
At present, the most issues are a safety of passengers. So thus OEMs have endeavored to enhance the strength of cars. Especially the new NCAP and IIHS’s regulations involved in roof crash have strengthened before a few years. However, B pillar has not satisfied a safety zones for passengers when the BIW has been developed for side impact. Therefore this paper will present the way to develop a new B pillar structure as using the tool of TRIZ..