• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.2
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• pp.117-126
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• 2009

In order to test the accuracy between the modified mild slope equation (MMSE) without evanescent modes and the plane-wave approximation (PA) of eigenfunction expansion method, various numerical results from both models are presented. In this study, analytical solutions of two models are employed, one based on the MMSE derived by Porter (2003) and the other on the scatterer method of PA by Seo (2008a). Judging from direct comparisons against existing results of rapidly varying topography, the PA model gives better predictions of the wave propagation than the MMSE model.

• Journal of Korean Society of Transportation
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• v.16 no.4
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• pp.195-212
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• 1998

본 연구는 새로운 설계일관성 검토기법의 정립을 위하여 수행되었으며, 이를 위해 속도추정 모형을 개발하였다. 본 연구를 통해 개발된 모형은 차량의 주행속도에 가장 큰 영향을 미치는 주 요소를 고려한 장점을 지니고 있다. 즉 평면곡선에서는 운전자의 시각적 판단을 기초로 등판차량의 주행속도를 추정하였다. 또한 이러한 속도추정이 승용차뿐만 아니라 트럭의 경우로 나누어 이루어짐으로써, 차종별 고려가 가능하도록 하였다. 다음은 본 연구를 통해 이루어진 결과이다. 평면곡선에서는 승용차와 트럭의 속도가 같게 추정되었으며, 시거를 통해 산정된 추정속도는 곡선반경과 밀접한 관계를 갖는다. 종단선형에서 승용차의 속도는 구배의 영향을 받지 않으나, 트럭은 구배의 영향으로 속도가 감소한다. 이 때 트럭에 작용되는 가속도는 모두 세 종류로써, 첫째, crawl speed에 도달할 때까지 작용한 가속도$(a_1)$와 둘째, crawl speed 이후 작용한 가속도$(a_2)$ 그리고 셋째, 하향구배 주행시 작용된 가속도$(a_3)$로 구분된다. Watanatade가 제시한 것과 같이 평지에서 나타나는 평면곡선의 주행속도와 구배지에서의 속도를 단순 비교 함으로써, 작은 속도의 궤적을 따라 평지에서 나타나는 평면곡선의 주행속도와 구배지에서의 속도를 단순 비교함으로써, 작은 속도의 궤적을 따라 합성선형의 속도를 추정하는 것은 합성선형이 차량의 주행속도에 미치는 영향을 간과한 것으로 판단할 수 있다. 그러나 본 모형에서는 합성선형의 영향을 고려하여 승용차와 트럭의 주행속도를 추정함으로써, 보다 현실적으로 주행속도를 추정하였다. 본 연구의 결과는 도로의 설계일관성을 검토하는데 매우 유용한 도구가 될 것이며 향후 운전자의 희망속도 결정, 감속율의 산정, 교통류의 고려, 도로설계의 전산화 자료와 연결 등을 통해 보다 실용적인 결과를 산출할 수 있을 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.12
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• pp.340-352
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• 2018

This study presents a method to find the extant central halls with the plan most similar to the remains and to find out and compare the architectural style of extant buildings for the restoration. In the Joseon dynasty, there existed both remains and the extant hall. In particular, the $3{\times}2Kan$ hall is the minimum size that functions as the hall, so the number of comparison articles is small. The subjects are three remains and 29 Extant Halls. The absolute size of the comparison articles are the Area, Ratio of front/side, and the relative sizes are the Ratio of front Eokan/Hyeopkan and Ratio of the front Eokan/the side row. The Daeungjeon remain in Bugjijangsa is similar in absolute size and relative sizes to Oeosa daeungjeon. The Bubdang remain in Seonchalsaji is similar to Sangwonsa daeungjeon in the Area and Ratio of front/side, and similar to Daejeogsa geungnakjeon in the Ratio of front/side and Ratio of front Eokan/Hyeopkan. The Bubdang remain in Seungseonsaji is similar to Seodongsa daeungjeon in the Area, Ratio of front Eokan/Hyeopkan and Ratio of the front Eokan /the side row. Consequently, this method has high value as a way to expand by other comparison articles.

• The Korean Journal of Nuclear Medicine
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• v.33 no.6
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• pp.475-483
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• 1999

Purpose: Complete fibrovascular ingrowth within the hydroxyapatite ocular implant is necessary for peg drilling which is performed to Prevent infection and to provide motility to the ocular prosthesis. We compared planar bone scintigraphy and SPECT for the evaluation of the vascularization within hydroxyapatite ocular implants. Materials and Methods: Seventeen patients (M:F: 12:5, mean age; $50.4{\pm}17.5$ years) who had received a coralline hydroxyapatite ocular implant after enucleation surgery were enrolled. Patients underwent Tc-99m MDP planar bone and SPECT imaging by dual head gamma camera after their implant surgery (interval: $197{\pm}81$ days). Uptake on planar and SPECT images was graded visually as less than (grade 1), equal to (grade 2), and greater than (grade 3) nasal bridge activity. Quantitative ratio of implanted to non-implanted intraorbital activity was also measured. Vascularization within hydroxyapatite implants was confirmed by slit lamp examination and ocular movement. Results: All but three patients were considered to be vascularized within hydroxyapatite implants. In visual analysis of planar image and SPECT, grade 1 was noted in 9/18 (50%) and 6/18 (33%), respectively. Grade 2 pattern was 7/18 (39%) and 4/18 (22%), and grade 3 pattern was 2/18 (11%) and 8/18 (44%) respectively. When grade 2 or 3 was considered to be positive for vascularization, the sensitivity of planar and SPECT imaging were 60% (9/15) and 80% (12/15), respectively. In 3 patients with incomplete vascularization, both planar and SPECT showed grade 1 uptake The orbital activity ratios on planar imaging were not significantly different between complete and incomplete vascularization ($1.96{\pm}0.87$ vs $1.17{\pm}0.08$, p>0.05), however, it was significantly higher on SPECT in patients with complete vascularization ($8.44{\pm}5.45$ vs $2.20{\pm}0.87$, p<0.05). Conclusion: In the assessment of fibrovascular ingrowth within ocular implants by Tc-99m MDP bone scintigraphy, SPECT image appears to be more effective than planar scintigraphy.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.6391-6396
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• 2015

In order to investigate characteristics of the von Mises yield criterion under 2 dimensional stress condition, two cases of plane strain were studied. One of which was for zero elastic strain and the other was for zero plastic strain increment. Yield functions for the plane strain condition for zero elastic strain and for the plane stress condition were represented as ellipse and the two yield functions were compared by ratios of major axis, minor axis and eccentricity and it was seen that the ratio of minor axis was the same between the two cases and the ratios of major axis and eccentricity were functions of Poisson's ratio. Region of elastic behavior obtained from considering plane strain condition of zero elastic strain increases as the Poisson's ratio increases. Yield function for plane strain obtained from considering zero plastic increment and associate flow rule was displayed as straight line and the region of elastic behavior was greater than that for the case of plane stress.

• The korean journal of orthodontics
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• v.36 no.5
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• pp.369-379
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• 2006

Objective: The purpose of this study was to find changes in the occlusal plane related to different vertical facial patterns and suggest treatment goals and conduct possible treatment mechanisms. Methods: 60 adult patients (28 males, 32 females) who had been diagnosed as Class 1 skeletal malocclusion and treated without extraction were selected. Patients were divided into three groups; short face type (group 1), average face type (group 2) and long face type (group 3), using the data on normal occlusion of Korean adults. Results: The results were achieved by analyzing cephalometric tracings of each group at pre-treatment, end-treatment and post-treatment (about 1 year recall check). The inclination of the occlusion plane tends to gradually increase as the face becomes longer In group 1, COP-X, FOP-X, L6/L1, MP-L6 were significantly decreased, and L1-FOP was significantly increased during the retention period (T3-T2). Group 2 showed no significant change, In group 3, FOP-X was significantly increased during the retention period (T3-T2). During the retention period, FOP-X showed significant change among each group, especially between group 1 and group 3. Conclusion: These results suggest that changes of occlusal plane inclination according to facial vertical pattern need to be considered during the retention period for intrusion, extrusion, and incisor overbite.

• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.5
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• pp.1132-1137
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• 1993

A simple simulative test was developed to evaluate stamping formability in plane strain stretching mode. The stamping formability was evaluated by limit punch height(LPH) in plane strain punch stretching test(PSST) compared to limit dome height(LDH) in hemispherical punch stretching test. PSST shows stable plane strain condition and good reproducibility with minimum scatter. Moreover LPH-value in PSST well ranks the stamping formability of various material and correlates with press performance.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.415-418
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• 2000

렌즈의 초점이 맞지 않아 흐려지고 잡음으로 훼손된 영상을 복원하는 경우에 일반적으로 정칙화 반복복원방법이 사용된다. 기존의 방법은 영상의 국부적인 특성을 고려하지 않고 영상전체에 일률적으로 정칙화를 행함으로써 윤곽부분에서는 리플잡음을 초래하고 평면부분에서도 잡음중폭을 피할 수 없으며, 또한 시각적으로 효율적이지 못한 면이 있다. 이러한 문제점을 개선하기 위하여, 본 논문에서는 영상을 방향이 없는 평면영역과 4가지 방향을 갖는 윤곽영역으로 나누어, 윤곽방향을 고려한 방향성 정칙화 연산자를 사용하여 평면영역과 윤곽영역의 방향특성에 따라 적응적으로 처리하는 반복복원방법을 제안한다. 제안한 방법은 기존의 방법과 비교하여 평면영역에서의 잡음 평활화가 개선되고 시각적으로 중요한 윤곽부분 복원에 효율적임을 실험결과를 통해 알 수 있었으며 ISNR 면에서도 우수하였다.

• Information and Communications Magazine
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• v.30 no.3
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• pp.29-35
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• 2013

네트워크 장비의 제어평면과 전송평면을 분리하고 전체 네트워크의 제어평면을 하나의 중앙 제어기에 통합하는 네트워크 아키텍처인 소프트웨어 정의 네트워킹 (Software Defined Networking)는 네트워크 산업과 학계에서 많은 관심을 받고 있다. 개별적으로 동작하는 기존 네트워크 장비와 달리 모든 제어평면의 기능이 하나의 중앙 제어기에 집중되기 때문에 제어기의 성능, 안정성, 유연성은 해당 제어기가 통제하는 네트워크 전체에 지대한 영향을 미치게 된다. 또 SDN의 제어계층과 전달계층 사이에 표준통신 인터페이스로 확고한 자리를 잡은 OpenFlow는 세계 유수의 글로벌ICT들이 참여하여 SDN열풍의 중심에 위치해있다. 본고 에서는 SDN의 개념에 대해 살펴보고, OpenFlow의 소개와 동작을 설명할 것이다. 또한 국내에서 최초로 개발된 새로운 OpenFlow 제어기인 MuL 제어기 플랫폼을 소개하고 다른 제어기들과의 비교분석을 통해 어떤 차별점을 갖는지 알아보고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.102-103
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• 2016

최근 소프트웨어 정의 네트워킹 기술에 대한 연구가 활발히 진행되면서 제어 펑면에 대한 많은 발전이 있었으나 여전히 데이터 평면의 하드웨어와 프로토콜에 대해 종속적이다. 이 문제를 해결하기 위해 데이터 평면을 프로그래밍할 수 있게 하여 white box 형태로 만드는 연구가 진행되고 있다. 본 논문에서는 하드웨어와 프로토콜에 독립적이기 위한 데이터 평면 프로그래밍 언어와 언어들의 독립성에 대해 살펴본다.