• 대한공간정보학회지
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• 제23권2호
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• pp.59-67
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• 2015

치수적 안전은 하천의 계획에 있어 가장 먼저 고려해야 할 사항이며 최근 폭넓게 진행 중인 하천의 복원에 있어서도 치수적 안전은 기본적인 전제조건이 된다. 안전한 하천의 계획은 정확한 측량자료로부터 시작된다. 본 연구에서는 스마트 지형공간정보를 이용하여 하천의 3차원 지형모델을 제작하고 제작된 3차원 지형모델을 이용하여 하천의 수리해석 및 하천 복원에 적용하였다. 이를 통해 상세한 하천 현황 데이터를 추출함으로써 보다 정확한 수리해석이 가능하였다. 또한, LiDAR 데이터를 도시하천의 수리해석에 이용할 경우 적용할 수 있도록 효율적인 데이터 처리와 수리해석의 정확성을 고려한 최적 횡단면 간격을 결정하였다. 하천 복원 설계를 위한 3차원 설계방안과 하천의 다양한 공간계획에 3차원 지형모델을 이용할 수 있는 활용 방안을 제시하였다.

• 대한한의학회지
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• 제30권1호
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• pp.40-50
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• 2009

Objectives: The clinical document forms, a format for collecting clinical data, is the most fundamental object of standardization. Doctors must have a mutual understanding of the clinical chart. Methods: Clinical document forms were developed by investigating existing conditions in hospitals and conducting demand surveys, doing literature research, and seeking expert advice for the improvement of version 1.0. In addition, an organization of a network of 19 Oriental medical doctors and nurses, 190 patients, and users of collected and assessed data was formed to come up with version 2.0. Results: The overall format was divided into different portions that the patient, nurse, and doctor must fill out, respectively. The patient's section consists of demographic data, lifestyle details, history, and symptoms. The data to be supplied by the nurse include the patient's vital signs and anthropometric parameters. As for the doctors, they are to supply data regarding the patient's palpitation, the detailed symptoms of the patient's head, ophthalmological and otorhinolaryngological symptoms (mouth), respiration, circulatory organ and chest conditions, digestive-organ conditions (thirst), neuropsychiatric conditions, reproductive system, musculoskeletal system, skin (depilation), etc. Conclusions: Common clinical chart development is the prior question to Traditional Korean Medicine standardization. A web-based clinical document format should be developed to support diagnosis and treatment, and furthermore EMR (electronic medical record system) and EHR (electronic health record) developed. Clinical information could be shared through a network of medical institutions and be useful Traditional Korean Medicine for evidence-based medicine.

• 무역상무연구
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• 제37권
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• pp.161-185
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• 2008

In 2006, the share of fisheries distribution in Busan amounted to 1.9 million ton, which was 41 percent of the whole country. In details, coastal fishery 334 thousand ton(14% of the whole country), deep sea fishery 452 thousand ton(82%), import fishery 964 thousand ton(70%), export fishery 157 thousand ton(43%) were distributed in Busan region, respectively. According to distribution share, import(50%), deep sea fishery(24%), coastal fishery(18%), export(8%) are main category of fisheries distribution in Busan. After the institutional changes in 1997, that is, from monopoly to the competitive systems are implemented, the share of sales volume through a home trust market decreased gradually since 2000. Especially, the share of direct sales in farming fisheries sector amounted to 73.8 percent of total production volume, 80.7 percent of production value in 2005. Furthermore, the share of fisheries sale through e-commerce is increasing owing to the growth of IT and competitive price of its products. and the sale share of large discount store is also on the 10% more increase. Hereafter these structure changes of fisheries distribution in Busan will be more intensified. Therefore, after reflecting the change in distribution policy of Busan Fisheries, the directions of distribution policy should be established, as follows. $\cdot$ Distribution policy to prepare for increasing of non-trust market sales $\cdot$ Fisheries distribution policy to prepare for increasing of direct transaction like e-commerce $\cdot$ Distribution policy to prepare for increasing of sales ratio in large discount store $\cdot$ Distribution policy for making up sound purchasing circumstance of Fisheries $\cdot$ Distribution policy for reducing the fisheries distribution cost $\cdot$ Distribution policy to prepare for increasing of direct carrying the deep sea fisheries and import fisheries to Seoul and $Inch'{\breve{o}}n$ section $\cdot$ Distribution policy for implementing the information system for managing fisheries transaction $\cdot$ Distribution policy for advancing the export & import management of fisheries $\cdot$ Distribution policy for establishing transaction principle reflecting the peculiarity in fishery distribution(to enacting independent fishery law)

• 대한토목학회논문집
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• 제34권6호
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• pp.1695-1705
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• 2014

본 연구에서는 지진취약도 해석에 사용되는 손상상태에 따른 수평변위한계값을 구조물의 항복 및 극한변위에 따라 확률통계적으로 새롭게 제안하기 위하여 국내외에서 실험된 원형단면의 철근콘크리트 교각 총 275본(비내진 149본, 내진 126본)의 실험데이터를 조사하였고 각 상세에 따른 교각의 정량적인 손상상태를 평가하였다. 이후 제안된 수평변위한계값에 따른 실제 교량구조물에 대한 비선형 시간이력해석을 수행한 후 그 결과를 토대로 지진취약도 해석을 통해 기존의 제안된 수평변위한계값들과의 차이를 비교분석하였다. 비교분석 결과, 제안된 값에 의한 중앙값이 기존의 값에 의한 중앙값보다 작게 나타났다. 이는 기존의 수평변위한계값으로 지진취약도 해석시 구조물의 성능을 과다 평가할 수도 있음을 나타낸다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제41권1호
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• pp.30-36
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• 2015

Objectives: The aim of this study is to determine the incidence, location, and orientation of maxillary sinus septa in formalin embalmed cadavers. Materials and Methods: The study was conducted on 210 cadaveric heads available in our department. After taking the mid-sagittal section the specimens were opened from the medial aspect and the sinus sinus septa, their anatomical plane, location and dimensions. Results: The mean linear distance between maxillary sinus floor and its anatomical ostium was $26.76{\pm}5.21mm$ and $26.91{\pm}4.96mm$ on right and left side, respectively. A total of 59 maxillary sinus septa (28.1%) were observed in 210 maxillary specimens. Septae were most common, 33 septa (55.9%), in the middle region (between first and second molar tooth) of the sinus cavity. The maxillary sinus membrane (Schneiderian membrane) adhered tightly to the maxillary sinus and over the septae. Significantly more maxillary sinus septa were observed in edentulous maxillae in comparison to the dentate upper jaw. Conclusion: Knowledge of location of maxillary sinus ostium is mandatory for the rhinologist for drainage of secretions in maxillary sinusitis. The morphological details of maxillary sinus septa, particularly their location and anatomical planes, will guide dentists in performance of safe implant surgeries. The maxillary antrum septa of category I and II may complicate the procedure of inversion of bone plate and elevation of sinus membrane during maxillary augmentation surgeries. The category III septa observed in the sagittal plane were embedded by one of the branches of the infraorbital nerve in it, and if accidentally cut will lead to infraorbital nerve palsy in maxillary sinus surgeries.

• Structural Engineering and Mechanics
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• 제25권4호
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• pp.445-466
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• 2007

As the LNG (Liquefied Natural Gas) tank contains cryogenic liquid, realistic thermal analyses are of a primary importance for a successful design. The structural details of the LNG tank are so complicated that some strategies are necessary to reasonably predict its temperature distribution. The proposed heat transfer model can consider the beneficial effects of insulation layers and a suspended deck on temperature distribution of the outer concrete tank against cryogenic conditions simply by the boundary conditions of the outer tank model. To this aim, the equilibrium condition or heat balance in a steady state is utilized in a various way, and some aspects of heat transfer via conduction, convection and radiation are implemented as necessary. Overall thermal analysis procedures for the LNG tank are revisited to examine some unjustifiable assumptions of conventional analyses. Concrete and insulation properties under cryogenic condition and a reasonable conversion procedure of the temperature-induced nonlinear stress into the section forces are discussed. Numerical examples are presented to verify the proposed schemes in predicting the actual temperature and stress distributions of the tank as affected by the cryogenic LNG for the cases of normal operation and leakage from the inner steel tank. It is expected that the proposed schemes enable a designer to readily detect the effects of insulation layers and a suspended deck and, therefore, can be employed as a useful and consistent tool to evaluate the thermal effect in a design stage of an LNG tank as well as in a detailed analysis.

• Steel and Composite Structures
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• 제34권1호
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• pp.107-122
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• 2020

Moment resisting stub columns (MRSCs) have increasingly adopted in special moment-resisting frame (SMF) systems in steel building structures, especially in Asian countries. The MRSCs typically provide a lower deformation capacity compared to shear-panel stub columns, a limited post-yield stiffness, and severe strength degradation as adopting slender webs. A new MRSC design with cored configuration, consisting of a core-segment and two side-segments using different steel grades, has been proposed in the study to improve the demerits mentioned above. Several full-scale components of the cored MRSC were experimentally investigated focusing on the hysteretic performance of plastic hinges at the ends. The effects of the depths of the core-segment and the adopted reduced column section details on the hysteretic behavior of the components were examined. The measured hysteretic responses verified that the cored MRSC enabled to provide early yielding, great ductility and energy dissipation, enhanced post-yield stiffness and limited strength degradation due to local buckling of flanges. A parametric study upon the dimensions of the cored MRSC was then conducted using numerical discrete model validated by the measured responses. Finally, a set of model equations were established based on the results of the parametric analysis to accurately estimate strength backbone curves of the cored MRSCs under increasing-amplitude cyclic loadings.

• 한국구조물진단유지관리공학회 논문집
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• 제17권4호
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• pp.38-47
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• 2013

프리캐스트 방식에 의해 제작이 가능한 격자형 강합성 바닥판의 이음부로서 콘크리트 전단키와 고장력볼트 체결로 구성된 조립식 이음부가 제안된 바 있다. 본 연구에서는 콘크리트 전단키와 고장력볼트로 구성된 이음부의 휨강성과 휨강도를 향상시키고자 단면상세를 개선하였고, 구조실험을 통해 얻은 결과를 기존 볼트체결 이음부와 비교 분석하였다. 비교분석 결과에 의하면, 전단스터드와 가외철근에 의한 이음부 콘크리트 보강으로 뚜렷한 전단균열 감소효과가 있었다. 모멘트-곡률 관계로부터 구한 휨강성을 서로 비교해 본 결과, 단면개선 전의 이음부에 비해 약 47% 정도 휨강성이 증가한 것을 알 수 있었다. 또한, 휨강도 비교결과에 의하면 개선된 이음부의 휨강도는 개선 전에 비해 약 32% 증가하였다. 개선된 이음부의 휨성능을 이음부가 없는 단면과 비교하면, 휨강도의 경우 동등 수준 이상이었으나, 휨강성의 경우는 약 37% 정도 더 작은 것으로 분석되었다.

• 한국지리정보학회지
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• 제12권3호
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• pp.21-34
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• 2009

홍수 시 흐름은 기본적으로 2차원 흐름으로서 이 때 하천 흐름의 수위와 유속 분포는 1차원 하천 모형으로 적절한 결과를 도출하기 어렵다. 이에 본 연구에서는 GIS를 이용하여 낙동강의 합류점에 대한 2차원 유한요소망을 구축하고 RMA-2모형을 이용하여 모의를 수행하였다. 이를 위해 모형의 매개변수들이 해석결과에 미치는 영향을 검토하였으며, 모형의 적용성을 검토하기 위해 금호강 합류부에 대해 흐름해석을 실시하고 검증하였다. 또한 하천의 단면 변화에 따른 흐름변화를 판단하기 위하여 과거 단면과 최근 단면에 대해 모의를 실시하고 비교 검토하였다. 그 결과 합류부에 대한 2차원 모형의 적용성을 검증하고 단변변화의 영향이 수위에 미치는 영향을 확인하여, 향후 합류부 처리, 하구부 처리, 제방축조 등에 효율적으로 활용될 수 있을 것으로 판단된다.

• 생체재료학회지
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• 제22권4호
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• pp.279-289
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• 2018

Background: Cell behavior is the key to tissue regeneration. Given the fact that most of the cells used in tissue engineering are anchorage-dependent, their behavior including adhesion, growth, migration, matrix synthesis, and differentiation is related to the design of the scaffolds. Thus, characterization of the scaffolds is highly required. Micro-computed tomography (micro-CT) provides a powerful platform to analyze, visualize, and explore any portion of interest in the scaffold in a 3D fashion without cutting or destroying it with the benefit of almost no sample preparation need. Main body: This review highlights the relationship between the scaffold microstructure and cell behavior, and provides the basics of the micro-CT method. In this work, we also analyzed the original papers that were published in 2016 through a systematic search to address the need for specific improvements in the methods section of the papers including the amount of provided information from the obtained results. Conclusion: Micro-CT offers a unique microstructural analysis of biomaterials, notwithstanding the associated challenges and limitations. Future studies that will include micro-CT characterization of scaffolds should report the important details of the method, and the derived quantitative and qualitative information can be maximized.