• Title/Summary/Keyword: Guide-line

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On-line Modeling of Robot Assembly with Uncertainties (불확실한 환경에서의 조립 작업을 위한 온라인 모델링 방법)

  • 정성엽;황면중
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.10
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    • pp.878-886
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    • 2004
  • Uncertainties are inevitable in robotic assembly in unstructured environment since it is difficult to construct fixtures to guide motions of robots. This paper proposes an augmented Petri net and an algorithm to adapt the assembly model on-line during actual assembly process. The augmented Petri net identifies events using force and position information simultaneously. Unmodeled contact states are identified and incorporated into the model on-line. The proposed method increases the level of intelligence of the robot system by enhancing the autonomy. The proposed method is evaluated by simulation and experiments with L-type peg-in-hole assembly using a two-arm robot system.

Adjustable Ghajar Guide Technique for Accurate Placement of Ventricular Catheters : A Pilot Study

  • Yoon, Sang-Youl;Kwak, Youngseok;Park, Jaechan
    • Journal of Korean Neurosurgical Society
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    • v.60 no.5
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    • pp.604-609
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    • 2017
  • Objective : An adjustable Ghajar guide is presented to improve the accuracy of the original Ghajar guide technique. The accuracy of the adjustable Ghajar guide technique is also investigated. Methods : The coronal adjustment angle from the orthogonal catheter trajectory at Kocher's point is determined based on coronal head images using an electronic picture archiving and communication system. For the adjustable Ghajar guide, a protractor is mounted on a C-shaped basal plate that is placed in contact with the margin of a burrhole, keeping the central $0^{\circ}$ line of the protractor orthogonal to the calvarial surface. A catheter guide, which is moved along the protractor and fixed at the pre-determined adjustment angle, is then used to guide the ventricular catheter into the frontal horn adjacent to the foramen of Monro. The adjustable Ghajar guide technique was applied to 20 patients, while a freehand technique based on the surface anatomy of the head was applied to another 47 patients. The accuracy of the ventricular catheter placement was then evaluated using postoperative computed tomography scans. Results : For the adjustable Ghajar guide technique (AGT) patients, the bicaudate index ranged from 0.23 to 0.33 ($mean{\pm}standard$ deviation [SD] : $0.27{\pm}0.03$) and the adjustment angle ranged from $0^{\circ}$ to $10^{\circ}$ ($mean{\pm}SD:5.2^{\circ}{\pm}3.2^{\circ}$). All the AGT patients experienced successful cerebrospinal fluid diversion with only one pass of the catheter. Optimal placement of the ventricular catheter in the ipsilateral frontal horn approximating the foramen of Monro (grade 1) was achieved in 19 patients (95.0%), while a suboptimal trajectory into a lateral corner of the frontal horn passing along a lateral wall of the frontal horn (grade 3) occurred in 1 patient (5.0%). Thus, the AGT patients experienced a significantly higher incidence of optimal catheter placement than the freehand catheterized patients (95.0% vs. 68.3%, p=0.024). Moreover, none of the AGT patients experienced any tract hemorrhages along the catheter or procedure-related complications. Conclusion : The proposed adjustable Ghajar guide technique, using angular adjustment in the coronal plane from the orthogonal trajectory at Kocher's point, facilitates accurate freehand placement of a ventricular catheter for hydrocephalic patients.

A Study of Urban Festival Guideline of Light Media Considering Personality Type of Preference on Media Arts (성격유형별 미디어 작품선호도 조사를 통한 도시의 빛 미디어 축제 가이드라인에 관한 연구)

  • Kim, Nam-Hyo;Kim, Kyu-Jeong
    • Korean Institute of Interior Design Journal
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    • v.20 no.6
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    • pp.282-290
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    • 2011
  • The public festival has a positive function to produce more pleasure and better life to urban residents on viewpoint of culture marketing. A research of relation between urban festival's media light environmental and personality type of audiences would give a design guide line on selection of festival media contents. The scope of study festival bounds three urban fesitvals from two thousand eight to two thousand ten. The personaliy indicator is used by self-mootioring scale called NEO-PI-R that Synyder, psychologist established in 1987. This indicator divides into five classes - N: Neutroticism, E: Extaversoon, O: Openness, A: Agreeableness, C: Conscientiousness. As a result, Anaysis of urban festival's media light environments considering five personality type of audiences are described, N type prefers the change a lot and low stability. E type prefers three dimensional video and dynamic production with passionate pressure. O type prefers radiates objects to promote the imaginative creatures with speculation. A type prefers contemplation arts with one way direction. C type prefers orderly art layout with accomplishing intention. The statistics datas anaynize ten factors to describe the urban complicated fesitival guide line clearly.

Power Splitting of Plasmonic Directional Couplers with Nano-scale Three Channels (나노 크기의 세 채널 플라즈마 방향성 결합기의 전력분배)

  • Ho, Kwang-Chun
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.3
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    • pp.47-52
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    • 2011
  • Directional couplers based on plasmonic waveguides with nano-scale three channels are designed by utilizing mode coupling effect as well as rib-guiding structure. Longitudinal modal transmission-line theory(L-MTLT) is used for simulating the light propagation and optimizing the design parameters. The designed plasmonic coupler operating as power splitter has nano-scale size of about 200~250 nm width. In order to achieve the desired power splitting ratio, the refractive index of guiding modes is evaluated along the width variation of center channel. Finally, a power splitter based on triple rib directional coupler, which ensures maximum power transfer from one outermost guide to the other outermost guide, is designed.

A Study on the Establishment of Management Criteria for Underwater Noise (수중소음 관리 기준 설정을 위한 소고)

  • Lim, Dae-Kyu;Shin, Young-Cheol;Jun, Yang-Bae
    • Explosives and Blasting
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    • v.28 no.2
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    • pp.119-132
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    • 2010
  • There are many dispute with a construction due to such environment problem as vibration and noise. Generally, we have a standard for acceptance level in land. But we have not a sufficient standard for acceptance level or guide line in underwater sound. In other countries, a acceptance level or guide line in underwater sound has been suggested. Especially the management criterion of underwater noise for fish has bee suggested using the measurement data (peak pressure, rms, energy and SEL) by a hydrophone. In Korea, there is no management criterion of underwater noise for fish. This study suggested the management criteria of underwater noise for fish based on the measured data by a hydrophone.

A study to choose damping material used to reduce floor impact noise considering structural stability of Ondol layer (온돌층의 구조안정성을 고려한 바닥충격음 완충재의 선정기준에 관한 연구)

  • Im, Jung-Bin;Lee, Byung-Kwon;Go, Jong-Chul;Hwang, Kyu-Sub
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.835-838
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    • 2008
  • In this study, long-term compression displacement of damping materials used to reduce floor impact noise and compressive load that crack begins to happen in Ondol layers including the material were measured as basic research to make guide line for right choice of damping material considering structural stability of Ondol layer. From the result, it was found that compression displacement by elapsed time as well as early displacement of damping material when load is applied on Ondol layer are should be included in the guide line for the choice of damping materials. And no problem is expected to be in structural stability of Ondol layer in case choose a damping material that compression displacement at three months later from inflict load is within 10% than initial thickness.

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Microbiological Quality and Change in Vitamin C Contents of Vegetables Prepared at Industrial Foodservice Institutions in Kumi (구미지역의 사업체 급식소에서 조리된 채소류의 미생물 품질 및 비타민 C 함량 변화)

  • Jang, Myeong-Suk;Kim, Geum-Ran
    • Journal of the Korean Dietetic Association
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    • v.4 no.2
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    • pp.263-269
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    • 1998
  • This study was investigated to see the microbiological results(total plate counts, coliforms) and vitamin C contents in cooking five kinds of raw and cooked vegetables, contributing to a data base for making better environment for foodservice, dividing cooking methods into two ways which was generally used at industrial foodservice institutions. Namul and Saengchae, especially Radish Saengchae, seasoned with red pepper powder after seasoning showed higher level of total plate counts and coliforms than guide line. After holding, just before serving, most Namul and Saengchae, except Bean sprout Muchim, showed higher microbiological level than guide line, Saengchae seasoned with soybean, salt, and red pepper paste and Radish Saengchae seasoned with salt and vinegar showed high level of vitamin C remaining rate. By the result of this study, better sanitary treatment and scientific cooking method is demanded when Namuls of Saenchaes are prepared with served in industrial foodservice institutions.

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Guidance system improvement method of subway and urban bus (도시철도 및 버스의 안내체계 개선방안)

  • Han, Woo-Jin;Kwon, O-Hyeon;Park, Jeong-Soo
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1777-1782
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    • 2007
  • Since July in 2004, starting with urban bus reorganization of Seoul metropolitan government, the change of the public transportation which integrates the urban bus and the subway of the metropolis are being continued. But the integration of such bus and the subway is staying to only a fare system mainly, and the guidance system of the subway and the bus has not changed. So we propose the concept of the new guidance system following public transportation change tendency. At first we introduce the new information system which can guide city railroad and bus altogether, and we propose new system which can guide divided by the trunk line and the branch line instead of bus and subway. Last high-functional guidance system which can give passengers tip and hint for various and effective usage of public transportation in more complicated city transit network is introduced. This new guidance system can increase competitiveness of public transportation system and stretch transportation share of it. And that guidance system is high-class contents that all public transportation business can utilize, so it can originate new industry. In conclusion, this new innovative guidance system is important field that government, local administration and public transportation business must be concerned and develop.

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A Study on the Guide Line of Quality of Waterproofing Admixture of Powder Type for Concrete (콘크리트 혼입용 분말형 구체방수재의 품질기준에 관한 연구)

  • 우영제;배기선;오상근;김형무
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.967-974
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    • 2000
  • By testing compressive strength, water absorption and water premeablity, to establish the standard of quality of waterproofing admixture of power type for concrete, we propose guide line as following ; $.$Setting time: more than 1 hour, within 10 hours $.$Slump: To be satisfied with request of user $.$Air content: To be satisfied with request of user $.$Safety: Without crack or deformation $.$Ratio of compressive strength: $\circled1$ At 3 days : more than plain specimen by 0.9 (An inorganic material) more than plain specimen by 0.4 (An inorganic material mixed organic) $\circled2$ At 7, 28 days : more than plain specimen by 1.0 $.$Ratio of water absorption Coefficient: $\circled1$An inorganic material: less than plain specimen by 1.0 $\circled2$ An inorganic material mixed organic : under than plain specimen by 0.8 $.$Ratio of water premeablity : $\circled1$ An inorganic material : less than plain specimen by 1.0 $\circled2$ An inorganic material mixed organic : under than plain specimen by 0.8

A Study for Detecting AGV Driving Information using Vision Sensor (비전 센서를 이용한 AGV의 주행정보 획득에 관한 연구)

  • Lee, Jin-Woo;Sohn, Ju-Han;Choi, Sung-Uk;Lee, Young-Jin;Lee, Kwon-Soon
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2575-2577
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    • 2000
  • We experimented on AGV driving test with color CCD camera which is setup on it. This paper can be divided into two parts. One is image processing part to measure the condition of the guideline and AGV. The other is part that obtains the reference steering angle through using the image processing parts. First, 2 dimension image information derived from vision sensor is interpreted to the 3 dimension information by the angle and position of the CCD camera. Through these processes, AGV knows the driving conditions of AGV. After then using of those information, AGV calculates the reference steering angle changed by the speed of AGV. In the case of low speed, it focuses on the left/right error values of the guide line. As increasing of the speed of AGV, it focuses on the slop of guide line. Lastly, we are to model the above descriptions as the type of PID controller and regulate the coefficient value of it the speed of AGV.

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