• Title/Summary/Keyword: Direction

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Tribological Behavior of the Alumina Reinforced with Unidirectionally Oriented SiC whiskers depending on whisker orientation (일방향성 배열을 가진 Sic whisker에 의해 강화된 알루미나 복합체의 Whisker orientation 에 따른 마모마찰 특성)

  • 간태석;한병동;임대순
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1999.06a
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    • pp.220-224
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    • 1999
  • Sliding wear test was employed to determine the effect of whisker content and orientation on the firiction and wear behavior of SiC whisker reinforced alumina. Composites containing unidirectionally oriented whiskers were prepared by a modified tape casting followed by lamination, binder removal and hot pressing in order to align the whiskers in the tape casting direction. Wear coefficients on three directions were measured; parallel and normal to the tape casting direction on the tape casting surface and normal to lamination direction on surfnce normal to the tape casting direction. In the effect of whisker orientation, the highest wear rate was obtained in the direction parallel tape casting direction and the lowest in the direction normal to lamination direction at all temperatures. Silicon oxide layer amoothing the surface was detected by energy dispersive X-ray analysis on the worn surface.

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Improvement Strategies for Prehospital Medical Direction in Korea (병원전 의료지도 개선방안)

  • Uhm, Tai-Hwan
    • The Korean Journal of Emergency Medical Services
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    • v.11 no.3
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    • pp.111-118
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    • 2007
  • Purpose : It was to present strategies on activation of prehospital medical direction in Korea. Methods : This study was conducted by analysing some papers on prehospital medical direction and statistical data from the National Emergency Management Agency. Results : There was no active application of medical direction methods such as Priority Dispatch System, Pre-Arrival Instructions, System Status Management and no data on prehospital medical direction. To estimate direct medical control on emergency patients who were sorted by EMTs in 2006 was only 2.5%. Conclusion : To improve prehospital medical direction, it needed to applicate data collecting & using system and in-direct & direct medical control by medical doctor.

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How Many Doctors and Paramedics Does Fire Service Need for Medical Direction in Korea? (소방 구급활동에 필요한 지도의사와 1급응급구조사의 수는?)

  • Uhm, Tai-Hwan;Yoou, Soon-Kyu
    • The Korean Journal of Emergency Medical Services
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    • v.12 no.2
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    • pp.37-43
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    • 2008
  • Purpose : It was to improve medical direction system through presenting need of doctor and paramedic in Korean Fire Service. Methods : This study was conducted by applying demand coefficients(4 for doctor, 3 or 4.5 for paramedic) to some data on medical director, paramedic, ambulance from National Emergency Management Agency. Results : Number of medical director & paramedic were 4 & 1,217. Number of necessary doctor for medical direction was 64 or 28(in case of direct medical direction) & 16 or 7(in case of indirect medical direction). Number of necessary paramedic for direct medical direction was 492(in case of 35% ALS ambulance) & 1,062(in case of 50% ALS ambulance). Conclusions : To improve quality & efficiency of medical direction brought up need of amendment of the Emergency Medical Services Act to apply indirect medical control such as standing orders, protocol, case review.

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A Characteristics of Directional Orientation of the Houses in Hangae, Omi, Daksil, Jusil Traditional Villages of Geomantic South-west (형국(形局)이 남서향(南西向)을 향하는 전통마을에서 주택의 방위(方位)적 특성 -한개, 오미, 닭실, 주실마을을 중심으로-)

  • Lee, Hyun-Byung;Kim, Sung-Woo
    • Journal of the Korean Institute of Rural Architecture
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    • v.11 no.3
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    • pp.45-52
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    • 2009
  • This study is about the co-relationship between the directional orientation of the houses and the geometric direction in the Korean traditional villages. The major mountain in the back of the village and the front mountain ranges give the most important influence for the direction of the houses. This paper, therefore, tries to identify how the houses of villages facing South-west direct the orientation. The village, where the natural environment face the South-west village, solves the problem by facing major direction rather than one all direction. All houses observe and respect the circumstance of geomantic surrounding to the extant that almost no houses revise its direction without any geomantic reference. This kind of research let us know the relationship between the natural direction, the direction of geomantic surrounding, and the direction of houses in traditional Korean villages.

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Novel deinterlacing algorithm using neighboring interlaced pixels directions statistics

  • Wang, An;Chen, Xiangdong;Yang, Yang;Jeong, Jechang
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2011.11a
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    • pp.204-208
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    • 2011
  • This paper proposes a novel deinterlacing algorithm using neighboring deinterlacing pixels directions weight, which can obtain the true deinterlacing direction of the interpolated pixel. The proposed algorithm determines the direction of the current interpolated pixel using MELA direction determination method. To obtain more accurate deinterlacing direction and increase interpolation direction correlation, the directions of neighboring pixels around the current interpolated pixel are considered. The current direction and the neighboring majority direction are compared to decide an interpolated method. But it cost slightly CPU time increasing since neighboring pixels directions determination and statistics. Experimental results demonstrate that the proposed algorithm outperforms the conventional deinterlacing methods.

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Development of Automatic Selection of Assembly Direction and Assembly Sequence Correction System (조립 방향 자동 판별 및 조립 순서 자동 수정 시스템 개발)

  • Park, Hong-Seok;Park, Jin-Woo
    • Korean Journal of Computational Design and Engineering
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    • v.18 no.6
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    • pp.417-427
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    • 2013
  • Assembly direction is used in order to confirm the generated assembly sequences in an automatic assembly sequence planning system. Moreover, assembly sequence planners can ascertain the feasibility of a sequence during simulation with assembly direction based in a CAD environment. In other words, assembly direction is essential for sequence optimizing and automatic generation. Based on the importance of assembly direction, this paper proposes a method to select the best direction for the generated assembly sequence using disassembly simulation and geometrical common area between assembled parts. Simultaneously, this idea can be applied to verify the generated assembly sequence. In this paper, the automatic selection of assembly direction and sequence correction system is designed and implemented. The developed algorithms and the implemented system are verified based on case study in the CAD environment.

The Performance Analysis of Burst Error Elimination CVDF Algorithm Using Switching Remote Direction Finding Antenna in VHF (VHF대역에서 원격운용 방향탐지안테나 소자의 스위칭에 의한 상관벡터방향탐지 버스트에러 제거 알고리즘 성능분석)

  • Won, Jong-Mook
    • Journal of the Korea Institute of Military Science and Technology
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    • v.10 no.3
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    • pp.129-138
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    • 2007
  • Recently, Direction Finding(DF) System is using switching DF algorithm to reduce system-weight by eliminating RF cable as much as possible. Also, Correlation Vector Direction Finding(CVDF) algorithms is being used for Fast Direction finding in tactical environment. In this paper, I will give you burst error elimination algorithms and compare the performance in case we use switching CVDF algorithm. Although antenna array is not working, we will successfully perform direction finding when we use this burst error elimination algorithms. Also, we will be completely capable of DF mission despite of meeting the unwanted situation that the monitoring signal disappear in case we use Switching Direction Finding algorithms. That situation frequently occurs under the Frequency Hopping signal circumstances.

Comparison of Korean & Chinese about Cognitive Approach to 'N+shang' through 'loushang' ('누상(樓上)'을 통해보는 'N+상(上)'에 대한 한국인과 중국인의 인지적 접근 비교)

  • Park, Minsoo
    • Cross-Cultural Studies
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    • v.39
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    • pp.177-190
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    • 2015
  • This study investigates the difference of the cognitive approach of Korean and Chines of the space direction that modern Chinese space phrase 'N+shang'. For this, we defined the spatial meaning of the noun 'N' and space noun 'shang' then investigate the conditions when 'N+shang' means 'the substance interior direction' and 'the substance exterior direction'. Also via 'lou+shang', we conducted the survey to Korean and Chinese students in order to see the what kind of cognitive differences be shown when they approach and translate the space direction of 'N+shang' structure. As a result of the survey, we were able to find cultural difference of spatial approach of 'N+shang' between these two countries, Korean select the cognitive inference path; from the substance external direction to internal direction while Chinese select from internal to external.

Characteristics of Coefficient of Consolidation in Horizontal Direction of Korean Marine clays (국내해성점토의 수평압밀계수 특성)

  • Jun, Sang-Hyun;Kim, Chang-Seop;Yoo, Nam-Jae
    • Journal of Industrial Technology
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    • v.28 no.B
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    • pp.71-79
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    • 2008
  • Reports about coefficients of consolidation in horizontal direction of marine clays located at seven different sites on western and southern coast area in Korea were reviewed and characteristics of them were investigated. As results of analyses, for relation between the depth of ground and coefficients, any trend and correlation between them can not be found since they are more influenced by the nature of geological formation rather than the depth of ground. Dissipation time t50, one of important factors in estimating value of coefficient of consolidation in horizontal direction, was found to be quite related to them. For the correlation between the maximum pore pressure developed and coefficients, coefficient of consolidation in the horizontal direction tend to decrease with increase of the maximum pore pressure whereas the ground water level or static pore pressure do not have any specific correlation with those coefficients. Values of coefficient tends to increase with values of liquid limit, plastic limit and plastic index and thus they are found to be directly influenced by the contents of fines. Values of coefficient of consolidation in horizontal direction are also increased with increases of permeability in horizontal direction and coefficient of consolidation in vertical direction. They were highly correlated between coefficient of consolidation and permeability in horizontal direction while values of coefficient of consolidation in horizontal direction have a relatively low correlation with values of coefficient of consolidation in horizontal direction. Sometimes, coefficient of consolidation in horizontal direction obtained from field tests were estimated 2-3 times greater than those from laboratory tests.

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A Study on Plastic Deformation Characteristics and Formability for Pure Titanium Sheet (순 티타늄 판재의 변형 특성 및 성형성 평가)

  • In, J.H.;Jeong, K.C.;Lee, H.S.;Kim, J.H.;Kim, J.J.;Kim, Young Su
    • Transactions of Materials Processing
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    • v.27 no.5
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    • pp.301-313
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    • 2018
  • In this paper, tensile test was performed on pure titanium sheet (CP Ti sheet) with HCP structure in each direction to evaluate mechanical and surface properties and analyze microstructural changes during plastic deformation. We also evaluated forming limits of Ti direction in dome-type punch stretching test using a non-contact three-dimensional optical measurement system. As a result, it was revealed the pure titanium sheet has strong anisotropic property in yield stress, stress-strain curve and anisotropy coefficient according to direction. It was revealed that twinning occurred when the pure titanium sheet was plastic deformed, and tendency depends differently on direction and deformation mode. Moreover, this seems to affect the physical properties and deformation of the material. In addition, it was revealed the pure titanium sheet had different surface roughness changes in 0 degree direction and 90 degree direction due to large difference of anisotropy, and this affects the forming limit. It was revealed the forming limit of each direction obtained through the punch stretching test gave higher value in 90 degree direction compared with forming limit in 0 degree direction.