The limit state design code for reliability-based design criteria was enacted in January 2012. And, it was necessary to consider new load carrying capacity method for new design code. Therefore, LRFR and ballowable stress design rating was applied to load carrying capacity and compared with the result. In addition, this research consists of ambient vibration measurement, experimental modal analysis, correction of the initial FE model based on the identified modal properties, and estimation of the load carrying capacity using the updated FE model

Conventionally, the load carrying capacities of bridges have been evaluated from proof loading tests with test trucks by measuring static and dynamic response, such ad deflections or strains under known loading conditions. However, load carrying capacity of bridges was evaluated using the updated finite element (FE) model. To solve these problems, deflections or strains can not represent the bridge's health status as the bridge gets deteriorated. For example, deteriorated boundary condition results in small deflection or strain. The proposed method consists of ambient vibration measurement, experimental modal analysis, correction of the initial FE model based on the identified modal properties, and estimation of the load carrying capacity using the updated FE model. The proposed method has been verified through field tests on a prestressed concrete girder bridge by comparing with the result of the conventional truck loading tests.

In this paper, a research was performed to estimate dynamic characteristics of bridges using wireless sensors. First, the developed wireless sensors were compared with wired sensors through laboratory tests. Field tests were carried out on a steel box girder bridge. Dynamic characteristics of the test bridge were identified from the measured data by wireless sensors. As a result, it was proven that the wireless sensor system could be effectively applied to the measurement of large civil-infra structures.

C. sakazakii ATCC 12868, 29004, 29544를 이용하여 저온 저장 중의 변화를 살펴보고 저온과 냉/해동, 저온과 산, 저온에서 starvation한 것과 냉/해동의 교차저항에 대해 알아보았다. C. sakazakii를 에서 10일간 저장하였을 때 모든 균주들에서 1 log CFU/mL의 사멸을 보였다. C. sakazakii를 에서 배양한 결과, C. sakazakii ATCC 12868, 29004는 각각 7일째, 5일째