• The Bulletin of The Korean Astronomical Society
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• v.36 no.2
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• pp.137.2-137.2
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• 2011

규표(圭表)는 남중하는 해의 그림자를 측정해 일 년의 길이와 절기를 알아내기 위한 관측 기기이다. 규표에 대한 우리 역사 기록에 따르면 조선시대에 8척과 40척 크기의 규표를 만들어 사용한 것으로 알려져 있다. 세종대에 간의대 서쪽에 설치한 40척 규표에 대해서는 그 구조와 크기가 상세히 기록되어 있지만 8척 규표에 대해서는 명종대의 관측 사실만이 남아있을 뿐이다. 8척 규표에 관한 국내 외 문헌과 중국에 남아 있는 유물을 조사하여 조선의 8척 규표 모델을 새롭게 복원하였다. 복원한 8척 규표는 주척(周尺, 1척=20.7cm)을 기준으로 규 21척, 표 8척의 크기이다. 오석으로 만든 규면에는 16척 길이의 눈금을 1분(2.07cm) 단위로 새겨놓았다. 청동으로 만든 표의 꼭대기에는 그림자를 명확히 나타내기 위해 길이 2척, 지름 1.2cm의 횡량(橫樑)을 설치하였다. 또한 횡량의 그림자를 정확하게 측정하기 위해 규면에 설치할 영부(影符)도 함께 연구 복원하였다. 규면에 새겨진 못(池)과 물홈(水渠)의 모양은 한국과 중국의 천문유물에 남아 있는 여러 자료와 구조적 기능을 고려해 결정하였다. 지금까지 국내에서 복원된 규표는 8척 규표에 대한 문헌 자료가 부족했기 때문에 40척 규표의 구조를 축소해서 만들어왔다. 이번에 복원한 조선의 8척 규표는 40척 규표의 축소 모형이 아닌 새로운 모델을 연구하여 제작한 것으로 한국천문연구원 앞뜰 간의 서편에 설치하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.10
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• pp.2541-2551
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• 1996

Human visual systems are sensitive to noise on the flat intensity area. But it becomes less sensitive on the edge area. Recently, many types of spatially adaptive image restoration methods have been proposed, which employ the above mentioned huan visual characteristics. The present paper presents an adaptive image restoration method, which increases sharpness of the edge region, and smooths noise on the flat intensity area. For edge detection, the proposed method uses the visibility function based on the local variance on each pixel. And it adaptively changes the regularization parameter. More specifically, the image to be restored is divided into a number of steps from the flat area to the edge regio, and then restored by using the finite impulse response constrained least squares filter.

• Journal of the Korea Institute of Building Construction
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• v.23 no.6
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• pp.851-862
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• 2023

This study introduces an objective and systematic framework for prioritizing buildings in the Gamyoung restoration project using a decision-support model. This model integrates evaluation criteria derived from a comprehensive literature review, refined through the Delphi method, and weights assigned via an Analytic Hierarchy Process(AHP) survey. Each building project is scored against these criteria to ascertain its priority for restoration, thereby facilitating informed decision-making for budget allocation in restoration projects. The effectiveness of the decision-support model was validated through a case study and expert consultations, demonstrating its practical utility in formulating concrete restoration project plans.

• Development and Reproduction
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• v.6 no.2
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• pp.97-104
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• 2002

In most mammals, mature oocyte-cumulus complexer(OCCs) ovulate into the oviduct where fertilization by sperm takes place. However, the complex that fail to fertilize eventually undergoes degeneration while they reside in the oviduct. Yet there is no blown mechanism how both oocyte and cumulus cells degenerate. Using human follicular fluid (hFF), bovine oviductal tissue extract (BOX) and mouse OCC, the present study aimed to find how the oviduct influence the viability of the oocyte and cumulus cells in vitro. There was no difference of oocyte maturation rate between the control and BOX-treated groups. However, there was a significant difference in the survival of cumulus cells between two groups. Cumulus cells cultured in the presence of hFF alone underwent initially expansion and then they formed monolayer in the culture dish. Even after 72 hr, they proliferated well and showed fibroblast-like morphology. Cumulus cells cultured in the presence of both hFF and BOX also expanded after 24 hr, however, after 72 hr culture, they eventually detached and degenerated. Cumulus cells cultured in the BOX alone gave a similar drastic result. When the cumulus cells cultured in the presence of BOX were stained with DAPI, their nuclei showed partial condensation and fragmentation. After detailed analysis of these cells by TUNEL assay, many nuclei of them exhibited well stained spots indicating the signs of apoptosis. Based upon these observations, it is suggested that BOX might possess a factor that leads mouse cumulus cells to undergo apoptosis in vitro.

• Journal of the Society of Naval Architects of Korea
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• v.44 no.3 s.153
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• pp.285-295
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• 2007

In order to ensure safety of small vessels, the amended Ship Safety Act will come into force on 4th. Nov. 2007. This study is performed to suggest the stability criteria of fishing vessels and cargo ships of 12m in length and over but less than 24m in length which will be new object of amended Ship Safety Act. We have analyze the dimensions of domestic small vessels and the casualty reports of capsizing accidents. According to the analyzed result, 58 ships that are in the range of the dimension are modeled and the stability calculation has been carried out. The Stability for the 58 ships has been analyzed by comparing the result that applied the selected standard in the national standard to the stability calculation. Based on the regression analysis of the model ship's allowable transverse metacentric-heights under several stability requirements, stability criteria for small fishing vessels and cargo ships are proposed.

• Journal of Cadastre & Land InformatiX
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• v.47 no.2
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• pp.61-78
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• 2017

When a boundary dispute occurs between landowners of adjoining lands, a court deals with a boundary violation on the basis of cadastral register. Boundary relocation surveying is one which reconstructs a boundary in cadastral register on actual land. Boundary relocation surveying includes most of surveyings related with the civil case such as restoration of land and demolition of building and a surveying result affects a ruling critically. However, boundary relocation surveying depends on surveying technician's knowledge and experiences and can lead to different surveying results. This study reviews legal principles of boundary relocation surveying by analyzing law practice of boundary relocation surveying which is used for solving a boundary dispute between landowners of adjoining lands and by examining related laws and Supreme Court precedents. The study seeks to contribute to consistent and reliable results of surveying by leading surveying technician to carry out a boundary relocation surveying on the basis of judicial doctrines.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.11b
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• pp.137-142
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• 2003

본 연구에서는 용수공급의 효율화를 최대화하고 비상시 수자원시스템의 최적운영을 위하여 다목적댐의 용수공급능력 평가지표를 산정하였다. 분석대상 유역으로는 비교적 자료구축이 잘되어있다고 판단된 안동댐을 선정하였으며 용수공급량을 -10~10%까지 증가시켜가면서 댐 모의운영을 실시하였다. 저수지 모의운영에 의해 용수부족사상수, 부족량, 부족기간 등을 산정하였으며, 이를 토대로 다목적댐의 용수공급능력 평가지표인 신뢰도(시간기준, 빈도기준, 양적기준), 복원도 및 취약도를 산정하고 계획용수공급량의 증감에 따른 이들 지표들의 영향성에 관하여 분석하였다.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.206-209
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• 2003

본 논문에서 제안하는 알고리즘은 심벌 타이밍 jitter 를 최소화하기 위해 가장 강한 신호를 주기적으로 감시하고, 그 신호를 적응적으로 DLL(Delayed Locked Loop)의 기준 신호로 정한다. 결과적으로 제안된 알고리즘은 DLL 추적 실패를 피할 수 있고, 기존의 알고리즘에 비하여 DLL의 정상 상태 추적 오류가 작다. 모의실험을 통하여 제안된 알고리즘의 정상상태 DLL 추적오류가 작고 다중 경로 상황에서 DLL 추적 실패를 피할 수 있음을 확인 하였다. 따라서 본 논문에서 제안하는 알고리즘은 OFDM 의 시간동기 복원 알고리즘에 적합하다.

• Journal of KIISE
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• v.44 no.3
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• pp.275-286
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• 2017

In this study, we propose a novel technique of software clustering to recover the software module-view by using the dependency and author entropy of modules. The proposed method first performs clustering of modules based on structural and logical dependencies, then it migrates selected modules from the clustered result by utilizing the author entropy of each module. In order to evaluate the proposed method, we calculated the MoJoFM values of the recovery result by applying the method to open-source projects among which ground-truth decompositions are well-known. Compared to the MoJoFM values of previously studied techniques, we demonstrated the effectiveness of the proposed method.

• Journal of the Institute of Convergence Signal Processing
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• v.6 no.1
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• pp.33-38
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• 2005

Degradation is generated by several causes in the process of digitalization or transmission of data. And its essential cause is noise. Therefore, researches for wavelet-based methods which reconstruct signal degraded by noise have continued. In AWGN(addtive white gaussian noise) environment, the general trend for denoising is to use the thresholding method. Reconstructed signal includes a lot of noise because these methods only consider statistical characteristic regarding noise. In this paper, we present a new method which uses the cumulation of wavelet detail coefficients. As a result, reconstruction of edges and denoising performance are improved. Also we compare existing methods using SNR(signal-to-noise ratio) as the standard of judgement of improvemental effect.