Since 2003, policies and practices related to the reduction of CO2 gas emission from ships has been discussing by the International Maritime Organization. The representative emission index and indicator are the EEDI (Energy Efficiency Design Index) for the new ships and EEOI (Energy Efficiency Operational Indicator) during the voyage. In this paper a water tank test and procedure development are introduced for the purpose of improving EEDI. The results showed good agreement explaining the characteristics properly.

통항선박의 횟수가 잣은 연안의 항로주변은 선박에 의해 발생하는 항주파로 정온화가 필요한 항만시설이나 마리나에 많은 외력을 주게 된다. 이는 이동 및 정박 중인 선박이나 항만시설의 안정성을 저해시키는 요인으로 작용한다. 본 연구에서는 항만시설 및 마리나가 설치된 해역의 정온해역을 확보하고자 수치해석 및 수조시험을 통하여 고정형 부유식 구조물 설치에 따른 구조물로 인한 파고변화 및 주위의 유체역학적 특성을 파악하고자 하였다. 해상환경에 따른 소파효

The Cold Neutron Research Facility(CNRF) is being built to produce a cold neutron which has peculiar physical property. In-Pool Assembly(IPA) was manufactured in a domestic factory, which is composed of moderator cell, heat exchanger, vacuum chamber, joint flange assembly and bracket etc. We had difficulties with the mechanical fabrication process due to the thin moderator cell. The special flange for the double flexible piping was developed. The tests of moderator cell, heat exchanger, vacuum chamber, double flexible pipe and IPA include the pressure test, normal temperature leak test and low temperature leak test. The moderator cell and heat exchanger were tested in the severe environmental condition and the burst tests of moderator cell were carried out. Above all, the bursting point took place at the area of the 0.01mm thinner place. It shows that the severe environmental test affects the bursting strength. The double flexible pipe welding at the IPA top plate was related with the arrangement of moderator cell in the vacuum chamber. Therefore the connecting welding of the double flexible pipe linked to sequent of the vacuum piping, helium piping and hydrogen piping. The fabrication, test and assembling of cryogenic in radiation zone were developed.