• 수산경영론집
• /
• 제45권3호
• /
• pp.39-53
• /
• 2014

This paper is to survey the research process and the problems in statistics of The Chronicle of Korea Fishery. The contents of The Chronicle were researched by two groups. One group is the managers of every province, the other group is the officers of every county. The managers performed the literature investigation research and field study and also arranged the reports from the county officers. But the managers seemed not to pay the full attention about the consistency of contents. The main contents about fishery are the number of coastal households and population, the number of fishery households and population, the number of fishing boats and fishing net. The body of The Choronicle and the table of fishing affairs in the appendages must be carefully compared to use the statistics. Though these statistics lack the consistency, the number of fishery households and boats deserves the attention. The fishing households account for less than 3% of all households, and about one third of fishing households has fishing boat.

• Structural Engineering and Mechanics
• /
• 제12권6호
• /
• pp.685-698
• /
• 2001

In this paper, a general method for the automatic search for Strut-and-Tie (S&T) models representative of possible resistant mechanisms in reinforced concrete elements is proposed. The representativeness criterion here adopted is inspired to the principle of minimum strain energy and requires the consistency of the model with a reference stress field. In particular, a highly indeterminate pin-jointed framework of a given layout is generated within the assigned geometry of the concrete element and an optimum truss is found by the minimisation of a suitable objective function. Such a function allows us to search the optimum truss according to a reference stress field deduced through a F.E.A. and assumed as representative of the given continuum. The theoretical principles and the mathematical formulation of the method are firstly explained; the search for a S&T model suitable for the design of a deep beam shows the method capability in handling the reference stress path. Finally, since the analysis may consider the structure as linear-elastic or cracked and non-linear in both the component materials, it is shown how the proposed procedure allows us to verify the possibilities of activation of the design model, oriented to the serviceability condition and deduced in the linear elastic field, by following the evolution of the resistant mechanisms in the cracked non-linear field up to the structural failure.

• 대한공간정보학회지
• /
• 제6권2호
• /
• pp.91-103
• /
• 1998

국가기본도 수치지도자료는 향후 정보시대의 기반정보로 1995년이래 시작된 1차사업을 완료하고 자료의 유통이 이루어지고 있다. 일반적으로 수치지도의 품질은 자료의 연혁, 위치정확돈 속성정확도, 논리적 일관성 및 완전성에 의해 좌우되며, 다양한 응용분야의 기초정보로 사용하기 위해서는 신뢰성 있는 풀질 확보가 이루어져야 한다. 본 연구에서는 국가기본도 수치지도자료 제작과정에서의 오류유형을 분석하여 주로 자료의 논리적 일관성과 완전성을 확보할 수 있는 자동검수프로그램을 개발하고, 위치정확도를 향상시킬 수 있는 제작방법을 제안함으로써 수치지도정보의 품질유지 및 정확도향상을 통해 고품질 수치지도제작에 기여하는데 목적이 있다. 본 연구의 수행결과, 수치지도의 GIS분야 응용분야에서 주요한 자료의 논리적일관성과 완전성을 확보할 수 있는 자동검수 프로그램을 개발하였으며, 고품질 수치지도제작방법을 제시함으로써 국가기본도 수치지도 데이터베이스의 품질확보 및 정확도향상에 기여할 수 있음을 알 수 있었다.

• 한국전산구조공학회논문집
• /
• 제21권2호
• /
• pp.153-160
• /
• 2008

본 연구에서는 완화된 평형조건을 만족하는 응력함수를 가지는 새로운 3절점 혼합요소를 제안하였다. 전단변형률을 고려한 본 요소는 Hellinger-Reissner 변분이론에 바탕하여 유한요소정식화를 수행하였다. 응력함수는 강체변형모드를 제거하고, 장일치(field consistency) 개념을 이용하여 곡선보의 극한거동에서 가성구속조건들을 억제할 수 있도록 선정하였다. 또한, 3절점 곡선보의 혼합정식화에서 강체변형모드를 제거하면서 동시에 평형방정식을 완전하게 만족하는 응력함수와 응력매개변수를 선정하는 것은 매우 어렵기 때문에 완화된 평형조건을 만족할 수 있는 응력함수를 도입하였다. 해석결과를 통하여, 제안된 3절점 혼합 곡선보요소가 곡선보의 해석에서 세장비와 곡률에 상관없이 매우 빠른 수렴성과 안정적인 거동을 나타냄을 확인할 수 있었으며, 응력분포 계산에 있어서도 기존 혼합요소보다 뛰어난 성능을 보여주었다.

• 전기학회논문지
• /
• 제58권3호
• /
• pp.598-604
• /
• 2009

This paper proposes a vehicle detector with an anisotropic magnetoresistive (AMR) sensor and addresses experimental results to show the detector's performance. The detector consists of an AMR sensor and mechanical and electronic apparatuses. The AMR sensor, composed of four magnetoresistors, senses disturbance of the earth's magnetic field caused by a vehicle moving over the sensor and then produces an output indicative of the moving vehicle. This paper verifies performance of the detector on the basis of experimental results obtained from the field tests carried under the two traffic conditions on local highways in Korea. First, I show the vehicle counting performance on a low speed congested highway by comparing the vehicle counts measured by the detector with the exact counts. Second, both vehicle counts and average speeds calculated from the measured point-occupancy on another continuously free running highway are compared with the reference values obtained from a loop detector which has two independent loop coils, where I have used several performance indices including mean absolute percentage error (MAPE) to show the performance consistency between the two types of detectors.

• Journal of Mechanical Science and Technology
• /
• 제18권10호
• /
• pp.1747-1754
• /
• 2004

In this study, a new harmonic axisymmetric thick shell element for static and dynamic analyses is proposed. The newly proposed element considering shear strain is based on a modified Hellinger-Reissner variational principle, and introduces additional nodeless degrees for displacement field interpolation in order to enhance numerical performance. The stress parameters selected via the field-consistency concept. are very important in formulating a trouble-free hybrid-mixed elements. For computational efficiency, the stress parameters are eliminated by the stationary condition and then the nodeless degrees are condensed out by the dynamic reduction. Several numerical examples confirm that the present element shows improved efficiency and yields very accurate results for static and vibration analyses.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2002년도 가을 학술발표회 논문집
• /
• pp.561-568
• /
• 2002

PFA(Paper Fly Ash) are reclaimed mainly or used in cement industry field as mixture agent in terms of materials recycling. Recently, research for recycling PFA as embankment materials or soil stabilization agent are undergoing in geotechnical engineering field. In this study, physical characteristics of PFA stabilization agent-soil admixtures are examined in change of water content, void ratio, consistency, grain distribution, specific gravity and density. Futhermore, the physical characteristics are compared with unconfined strength as engineering characteristics. Test results showed that unconfined strength and density are increased with increasing of PFA stabilization agent mixed ratio. On the other hand, specific gravity, void ratio and water content are decreased with increasing of PFA stabilization agent mixed ratio. It would be concluded that natural high water content ratio weak soil could be highly improved engineering and physical characteristics with PFA stabilization agent

• 한국철도학회논문집
• /
• 제12권2호
• /
• pp.260-266
• /
• 2009

위험도분석은 철도사고해석에 주로 사용되는 이론이다. 위험도 분석의 목적은 전설공사전체 과정에서 주요사고부 사고요인과 잠재적인 원인 및 기여정도 등을 조사 분석하는 것이다. 본 논문은 건설공사 현장에서 발생하는 사고원인과 패턴을 분석하고 사고빈도와 심각도를 고려한 위험도 지수를 계산하여 상대적인 위험도 평가를 제공하고자 하는 것이다. 이를 기반으로 사고 위험도 지수의 일관성을 유도하고 위험도 평가를 위한 정량적인 기준을 제공하고자 하였다.

• 한국비블리아학회지
• /
• 제29권2호
• /
• pp.5-34
• /
• 2018

본 연구에서는 국제연구협력관련 모든 정보유형을 발굴하고 각 유형별로 정보를 수집하여 데이터베이스로 구축하고자 하였다. 이를 위해 연구진이 메타데이터를 일차적으로 개발하고 메타데이터 전문가들과의 논의과정을 거쳐 1차적으로 메타데이터를 개발하였으며, 이에 대해 국제연구협력 관련 전문가들을 대상으로 설문조사를 수행하였다. 뿐만 아니라 각 정보원 유형별 메타필드에 데이터를 수집하여 입력하였으며, 메타필드별로 실제 데이터가 존재하는지 등의 과정을 거쳐 메타필드를 검증하였다. 본 연구에서 설계한 DB 유형은 국제연구협력정보원 DB, 국제연구협력 사업 DB, 국제연구협력 전문가 DB, 국제연구협력 기관 DB, 국제기구 DB, 기타 DB 등이며, 이에 대해 설문조사를 수행하고 실제 데이터를 입력하여 필드를 검증한 결과, 설문조사 결과와 필드별 데이터 입력률은 상당히 높은 일치율을 보였다. 다만 국제기구 데이터 필드만은 이용자의 높은 중요도 평가에도 불구하고 10%이하의 데이터 입력률을 보이는 필드가 25% 정도 있는 것으로 확인되었다.

• 산업기술연구
• /
• 제28권B호
• /
• pp.81-89
• /
• 2008

This paper is results of investigating the dominant factors influencing to coefficient of consolidation in horizontal direction of Korean marine clays and their correlations through literature review. From the results of analyzing data obtained from field tests such as piezocone penetration and dilatometer tests as well as laboratory tests, coefficient of consolidation in the horizontal direction was found to increase with increase of stiffness index of soil while it decreases with the increase of dissipation time of pore pressure developed during field tests. In general, the coefficient of consolidation in the horizontal direction tends to increase with increase of undrained shear strength and preconsolidation pressure although correlation between them are relatively low. Friction ratio has a high correlation with coefficient of consolidation in the horizontal direction in case of friction ratio being greater than 1.0. For methods of estimating coefficient of consolidation in the horizontal direction with different testing device, values obtained from methods of P2-logt and DMT-A with dilatometer were quite similar to values from piezocone penetration test. Consistency of soil is quite proportional to coefficient of consolidation in the horizontal direction. Clear correlation between coefficients of consolidation in the horizontal and the vertical directions could not be found. coefficient of consolidation in the horizontal direction estimated from the results of field test tends to be 1.13~3.11 times greater than that obtained from laboratory tests.