Measuring the exact cable tension force is important to cable supported bridge under construction and on service. This study was planned to propose EM(electro-magnetic) sensor-based method for measuring the tension force of MS(multi-strand) cable in cable-stayed and extradosed bridge. The tension force in each strand is the same due to MS cable construction using Iso-tensioning system. Therefore, In this prosed method, EM sensor was installed directly at a strand and the measurement model was established for estimating the tension force of strand via EM sensor by experiments. The measurement model was derived from the relation of tension force and magnetic permeability. Also, the magnetic permeability is shown to be different according to the magnetization characteristic of 1860MPa and 2200MPa high-strength strand. The difference is increased as tension force increases. Additional experiment was conducted to verify the measurement model. As a result, the distribution of strand tension calculated upon the EM sensor is similar to those of tension measured by load cell. This proposed approach can be an effective tool for monitoring and measuring the cable force of MS cable.

This paper aims to analyze the scores assigned to compositions of Korean as a foreign language (KFL) in terms of the many-facet Rasch measurement (MFRM) model. The MFRM computer program Facets has recently been updated and this research uses it in order to investigate the scoring reliability of KFL writing test. For the research data the Korean compositions written by 270 KFL learners were collected and rated by eleven Korean raters. At first a brief theoretical basis for the Facets is introduced based on the MFRM model. Then focusing on the raters’ characteristics such as rating consistency and fitness in terms of the rating scheme of content/organization and language, the collected scores of KFL compositions are analyzed and the analysis results are interpreted. As a result, a few cases of unreliable scoring of Korean raters are identified, but it appears that the ratings of Korean raters for a standardized KFL writing test are generally reliable. Finally it is suggested that the Facets program of MFRM offer many potential advantages for validating the scoring reliability of Korean writing assessment.

실제로 서비스를 이용하는 대상인 소비자에게 서비스가 어떻게 인식되고 평가되는지에 대한 명시적인 모형이 부족함에 따라 이를 보완하기 위한 방안으로 서비스품질에 대한 연구가 시작되었다. 본 연구에서는 Parasuraman et all.(1988)의 연구를 토대로 구성한 PZB모형 과 Brady and Cronin(2001)의 연구를 토대로 구성한 BNC모형에 서비스품질모형을 적용하고, 그에 대한 우수성을 비교하였다. 터미널 이용자 를 대상으로 진행한 설문을 활용하여 분석한 결과 PZB모형보다 상대적으로 BNC모형이 더 우수한 것으로 나타났다. 요인이 많아짐에 따라 제공되는 정보의 양이 증가하고, 이로 인하여 설명력이 높아지기 때문에 이러한 결과가 나타난 것으로 보인다. 연구의 결과는 산업의 특성에 따른 차이가 존재하겠지만 본 연구에서 제시한 결과는 추후 항만하역업에 대한 연구범위의 확장으로 이어지기를 기대한다.

Recently, an indirect displacement estimation method using data fusion of acceleration and strain (i.e., acceleration-strain-based method) has been developed. This paper proposes an improved displacement estimation method that can be applied to more general types of bridges by building the mapping using the finite element model of the structure. An experimental validation of the proposed method was carried out on a prestressed concrete girder bridge, and the method provides the best estimate for dynamic displacements.

본 연구는 교량의 상시계측자료인 고유진동수 및 고유모드를 기준으로 계측기반모델을 구성하고, 구조해석을 수행하여 교량 공용상태에서 사장케이블 장력평가를 수행하였다. 케이블 설치 위치에 따라 하중유형별 케이블 장력이 다르다는 것을 알 수 있다. 고정하중과 활하중에 의한 케이블 계측장력은 케이블 설치위치에 따라 차이가 크지 않으나 설계하중을 적용한 해석결과보다 큰 값을 나타낸다. 계측기반모델에 대한 케이블장력분포는, 설계모델에 대한 장력보다 크지만, 계측장력과 유사한 분포를 나타낸다. 그러므로 장기거동을 고려하여 사장교 케이블설계는 계측기반모델의 해석결과를 반영할 필요가 있다. 이를 위하여 많은 계측자료를 이용한 장기거동 분석연구가 요구된다.