• 대한용접접합학회:학술대회논문집
• /
• 대한용접접합학회 2003년도 춘계학술발표대회 개요집
• /
• pp.149-151
• /
• 2003

The development of lightweight car bodies is the most prominent issue in the automotive industry today, in preparation of environmental regulations such as reduction of CO$_2$ emissions. Also, with the recent implementation of mandatory off-set collision test, many studies have been carried out to enhance the safety of automobiles. Recently, TRIP(Transformation Induced Plasticity) steel has developed as a prominent alternative due to its high strength and superior elongation. In this study, TRIP steel weldability is evaluated with lobe curve, continuous spot welds, shunt effect, and weld of edge position.

• 한국자동차공학회논문집
• /
• 제11권1호
• /
• pp.42-48
• /
• 2003

LPG has been a broad concern of pro-environmental alternative fuel for vehicles. Recently, the new Liquid Phase LPG Injection(LPLI) system extends the limit of power of LPG engine and gives a chance to substitute LPG engine for diesel engine of heavy duty vehicles that are the main resources of air pollution in urban area. Large bore size of heavy duty LPG engine derives a serious knock problem. To find an optimal MBT conditions, it is necessary to know how the flame develops in the combustion chamber and find where the knock positions are. In this study. the ion-probe head gasket was used to estimate the knock position. Inverse operation of the ion-probe signal provides the flame developing characteristics. The further the position is from the spark plug, the later the flame arrives and the more times knock occurs. The main factor that effects knock position is inferred a flor situation of mixed gas in the combustion chamber.

• 대한방사선기술학회지:방사선기술과학
• /
• 제35권2호
• /
• pp.103-107
• /
• 2012

본 연구는 어깨 통증을 호소하는 환자들 중 어깨충돌 증후군(SIS : Shoulder Impingement Syndrome)이 의심되어 진단을 위해 Y-view 검사가 필요하지만 몸이 불편하여 자세를 취하기 힘든 환자들을 위하여 편안하게 누운 자세에서 검사할 수 있는 modified Y-View를 고안하기 위해 연구를 실시하였다. 환자는 바로 누운 자세를 취하고 X선관(tube)의 각도를 내측으로 35도, 40도, 45도로 변화를 주어 검사한 영상을 비교 분석해 본 결과 X선관(tube)의 각도를 내측방향으로 40도를 주는 것이 견봉(acromion)과 쇄골(clavicle)의 공간(space), 오훼견봉궁(coracoacromial arch)의 모양을 잘 묘출 할 수 있어 진단에 가장 유용한 영상을 얻을 수 있었다. 따라서 환자가 Y-View 검사를 할 수 없을 경우, 이를 대체하기 위한 유용한 수단으로 modified Y-View를 활용할 수 있음을 알 수 있었다. 이 연구를 통하여 어깨충돌 증후군뿐만 아니라 견관절 질환에서의 다양한 적용을 기대해 본다.

• 대한한방부인과학회지
• /
• 제22권3호
• /
• pp.205-222
• /
• 2009

Purpose: The aim of this study was to review systemically journals on the studies for Complementary and Alternative Medicine in the treatment of breast cancer. Methods: Through medical websites, foreign clinical literatures about complementary and alternative medicines of breast cancer were searched. The cite used was http://www.Pubmed.gov. And then they were divided into three groups. Medication, Non-medication therapies and questionnaire reports. Results: 1. We researched 23 papers about herb medicines. Most of papers were about single herb and there were rarely about mixed composition. And there were papers about Ocimum gratissimum, elliptilimba, seeds of Livistona chinensis, golden feverfew which were not commonly used in Korea. 2. We researched 16 papers about acupuncture. Acupuncture had a possitive effect on such symptoms like flushing, nausea and vomitting and pain on upper limb caused by anticancer therapy or tamoxifen or surgery. 3. We researched 36 papers about questionnaire study. Most were about research for women who diagnosed as breast cancer or women after breast cancer surgery. Subjects were about proportion of using CAM, purpose of using it, most popular CAM therapy, satisfaction degree, and relation with age, aducation and social position. And most conclusion were that patient-doctor communication was needed. Conclusion: Afterwards we have to focus on realisitic clinical studies about breast cancer patients, especially postsurgery and people who takes anticancer therapy. And we have to be interest in acupuncture therapy on breast cancer patients.

• 생물환경조절학회지
• /
• 제16권3호
• /
• pp.264-268
• /
• 2007

국내 육성 품종인 3년생 '홍로'와 도입 품종인 4년생 '갤럭시갈라' 사과를 대상으로 정아 고사 시 장과지 및 액아의 활용 가치를 알아보고자 결과지 길이 및 꽃눈 위치 따른 개화 및 과실 특성을 조사하였다. '홍로'와 '갤럭시갈라' 모두 개화시, 만개기 및 낙화기는 20 cm 이상 결과지에서 5 cm 미만과 $10{\sim}15cm$ 결과지보다 다소 늦었다. 화총당 꽃수도 때 정도 적었다. 과중, 종자수, 당산비 등 대부분의 과실 특성은 5 cm 미만과 $10{\sim}15cm$ 20 cm 이상 결과지보다 높았지만, 당도와 산 함량은 반대의 경향이었다. 20 cm 이상 결과지의 정아와 액아 간 대부분의 과실 특성은 액아에서 좋은 경향을 나타내었지만, '홍로' 사과의 종자수, '갤럭시갈라'의 Hunter a값을 제외하고는 유의한 차이를 나타내지 않았다. 그리고 두 품종 모두 과중과 종자 간 높은 상관성을 나타내었다. 따라서 정아 고사 시 장과지로 대체 활용할 수 있고 '갤럭시갈라'의 경우 액화아의 이용도 가능하였다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
• /
• pp.480-480
• /
• 2008

Vacuum circuit breaker(VCB) is now emerging as an alternative of gas circuit breaker(GCB) which uses SF6 gas as insulating material whose dielectric strength is outstanding. But we have to reduce SF6 gas because SF6 gas is one of greenhouse gas and efforts to reduce greenhouse gas are now trend of the world. Therefore, we can say VCB is the optimal alternative of GCB because vacuum is environmentally friendly. The vacuum interrupter is the core part of VCB to interrupt arcing current. There are mainly two methods to extinguish arc. One is radial magnetic field (RMF) method and the other is axial magnetic field (AMF) method. We deals with RMF method in this paper. Compared with AMP, RMF arc quenching method has different principle to extinguish arc. In case of RMF method, pinch effect is much larger than AMF method. Because of pinch effect RMF type contact electrodes have the single large spot which is severly damaged and melted while AMF type contact electrodes have small and multiple spots which are slightly damaged and melted. To prevent contact electrode being damaged and melted from high temperature-arc, RMF method uses Lorentz force to move arc. In this paper we calculated and compared the arc driving force of two cases and we analyzed the force acting on each part of arc by means of commercial finite element method software Maxwell 3D. They have 3petals and we considered two cases. One is the case when fixed(upper) and movable(lower) contacts are in mirror arrangement (Case 1). The other is the case when one of two contacts (movable contact) is revolved at maximum angle as possible as it can be (Case 2). And at each case above, we analyzed arc driving force at two positions, position 1 is the closest to the center of contact and position 2 is near the edge of petal on fixed contact. As a result we could find that Case 2 generated stronger arc driving force than Case 1 at position 1. But at position 2 Case 1 generated stronger arc driving force than Case 2. This simulation method can contribute to optimizing spiral-type electrode designs in a view of arc driving force.

• 한국해양공학회지
• /
• 제23권2호
• /
• pp.58-68
• /
• 2009

The increased use of unmanned underwater vehicles (UUV) has led to the development of alternative navigational methods that do not employ acoustic beacons and dead reckoning sensors. This paper describes a simultaneous localization and mapping (SLAM) scheme that uses range sonars mounted on a small UUV. A SLAM scheme is an alternative navigation method for measuring the environment through which the vehicle is passing and providing the relative position of the UUV. A technique for a SLAM algorithm that uses several ranging sonars is presented. This technique utilizes an unscented Kalman filter to estimate the locations of the UUV and surrounding objects. In order to work efficiently, the nearest neighbor standard filter is introduced as the data association algorithm in the SLAM for associating the stored targets returned by the sonar at each time step. The proposed SLAM algorithm was tested by experiments under various three degrees of freedom motion conditions. The results of these experiments showed that the proposed SLAM algorithm was capable of estimating the position of the UUV and the surrounding objects and demonstrated that the algorithm will perform well in various environments.

• Ocean and Polar Research
• /
• 제27권3호
• /
• pp.335-339
• /
• 2005

The underwater positioning system is important in interpreting data that are acquired from towing vehicles such as the deep-sea camera (DSC) system. Currently, several acoustic positioning systems such as long baseline (LBL), short baseline (SBL), and ultra short baseline (USBL), are used for underwater positioning. The accurate position of DSC, however, could not be determined in a R/V Onnuri unequipped with any of these underwater positioning systems. As an alternative, the DSC position was estimated based on the topography of towing track and cable length in the cruises before 1999. The great uncertainties, however, were found in the areas of flat bottom topography. In the 2003 and 2004 cruises these uncertainties were reduced by calculating the position of DSC with the cable length and seafloor depth below the vessel. The Japanese cruises for Mn-nodule used a similar estimation method for the DSC positioning system with a CTD sensor. Although the latter can provide better information for the position of DSC, the USBL underwater positioning system is strongly recommended for establishing better positioning of DSC and other towing devices.

• 유통과학연구
• /
• 제18권1호
• /
• pp.95-105
• /
• 2020

Purpose: Will more expensive gifts be more pleasurable and appreciated? This is a general expectation of gift-givers. According to the previous study on Americans (Flynn and Adams 2009), recipients tend to appreciate gifts regardless of their price. It indicates that there is an interaction effect between position (giving / receiving) and gift price. This study expands the previous study and aims to answer the following two questions: "Are such an interaction effect observed in Korean, too?" and "What types of people prefer expensive gifts?" Research design, data, and methodology: Study 1 of the current research repeated the Study 3 of Flynn and Adams (2009), with an iPod (high-priced gift condition) and a music CD (low-priced gift condition). That is, a 2 (gift price: high / low) x 2 (position: giver / receiver) between-group design was used. Study 2 used gift certificates of 100,000 won (high-priced gift condition) and 5,000-won gift (low-priced gift condition). Unlike the previous study that measured only one dependent variable (gratitude), this study added five more dependent variables in an attempt to exclude alternative explanations, such as endowment effects or emotional conflicts. This study also measured individualism / collectivism, face sensitivity, and materialism to explore the types of people who prefer expensive gifts. Results: The interaction effect between gift price and position on the level of appreciation was not significant. Meanwhile the main effect of gift price and of position were significant. The gift-recipient was more appreciative than the gift-givers' expectation regardless of the price of gifts. To investigate individual differences, individualism/collectivism, face sensitivity, and materialism were examined, but none of these variables were significantly related to the preference for expensive gifts. Respondents who received gift certificates in Study 2 were less grateful than those who received iPods or music CDs in Study 1. Conclusions: This study found that Koreans tend to be more grateful if they receive expensive gifts, in contrast to the Flynn and Adams (2009)'s study with Americans. In addition, gift-recipients appreciated more than givers' expectation and were more grateful when they received tangible products rather than gift certificates.

• Journal of Welding and Joining
• /
• 제23권3호
• /
• pp.76-82
• /
• 2005

Recently the application of laser welding technology has been considered to shipbuilding structure. However, when this technology is applied to primer coated steel, good quality weld beads are not easily obtained. Because the primer-coated layer caused the spatter, humping bead and porosity which are main part of the welding defect attributed to the powerful vaporizing pressure of zinc. So we performed experiment with objectives of understanding spatter and porosity formation mechanism and producing sound weld beads in 6mmt primer coated steels by a $CO_2$ CW laser. The effects of welding parameters; defocused distance, welding speed, coated thickness and coated position; were investigated in the bead shape and penetration depth on bead and lap welding. Alternative idea was suggested to suspend the welding defect by giving a reasonable gap clearance for primer coated thickness. The zinc of primer has a boiling point that is lower than melting point of steel. Zinc vapor builds up at the interface between the two sheets and this tends to deteriorate the quality of the weld by ejecting weld material from lap position or leaving porosity. Significant effects of primer coated position was lap side rather than surface. Therefore introducing a small gap clearance in the lap position, the zinc vapor could escape through it and sound weld beads can be acquired. In conclusion, formation and suspension mechanism of the welding defects was suggested by controling the factors.