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.

기존의 교량받침으로 많이 사용되고 있는 폴리우레탄 디스크를 적용한 POT형식에 C형 강재감쇠장치를 추가적으로 적용한 새로운 형태의 지진격리장치에 대한 명확한 정적 성능검증과 동적특성을 파악하기 위하여 최대 극한 수직하중 시험, 최대 회전 시험, 동적재하 시험 및 동적재하 극한 반복시험을 시행하였다. 해석적 결과와 성능시험 결과를 비교분석한 결과, 충분한 감쇠능력을 보유하고있을 뿐만 아니라, 설계기준에도 적합하다는 결론을 얻을 수 있었다. 또한, EDC 및 유효강성값의 시험치가 이론치와 유사하여 시험 결과값의 분석이 유효함을 보였다.

본 연구는 식물체 캘러서의 접종공정을 자동화하기 위한 로봇개발을 위하여 수행되었으며, 본 보에서는 로봇의 주요구성부인 엔드이펙터 및 전체 로봇시스템의 성능에 대한 연구결과를 소개하였다. 이에 본 보에서 소개한 연구결과를 요약하면, 캘러스 접종을 위하여 흡인식 엔드이펙터와 기계식 엔드이펙터를 제작하였으며, 흡인식은 분리 및 치상의 겸용, 기계식은 분리 분할 치상용으로 각각 분리하여 제작하였으며, 흡인식 엔드이펙터의 성능시험 결과, 평균 8.2kPa의 흡인압에서 캘러스가 깨끗이 분리되었으며 분리된 캘러스를 새배지로 치상 고정히는데 소요되는 적정 배출압은 12kPa로 나타났다. 또한 기계식 엔드이펙터를 이용한 접종공정 자동화 시스템의 성능시험으로서 분할, 파지, 이송 및 치상 작업 성능을 시험한 결과 분할에서는 97%, 분할된 캘러는 모두 정확하게 파지되었으나, 치상하기 위하여 새로운 배양용기로 이송하는 과정에서는 일부 미끄러지는 현상이 발생하여 95%의 성능을 보였고 이송된 캘러스는 모두 정확하게 치상이 기능하였다. 따라서 분할하여 치상할 총 80개의 캘러스 가운데 74개가 정확하게 작업되는 것으로 나타나 전체 성공율은 92%였다. 또한 식물 조직 배양 자동화 공정에 사용되는 로봇에 있어서 엔드 이펙터를 장착하게 되는 매니퓰레이터로서는 6자유도의 매니퓰레이터를 선정하였다.

In this paper, we introduce the performance evaluation and development of Raw VLBI Data Buffer(RVDB) system for the synchronized playback processing of observed data in Korea-Japan Joint VLBI Correlator(KJJVC). The high-speed correlation processing system is under development so that the radio data obtained with 8192 channels and 8 Gbps speed from 16 stations will be able to be processed. When the recorded data of each station are played to correlator, the time synchronization of each station is very important because the correlator should process the data obtained with same time and condition. There are many types of recorder systems in the East Asia VLBI Network (EAVN). Therefore it is required to prepare the special time synchronized playback processing system to synchronize the time tag of observed data. The developed RVDB system consists of Data Input Output(DIO), 10GbE switch, and Disk Data Buffer(DDB). It can record the data with maximum 2 Gbps speed, and can play back the data to correlator with nominal 2 Gbps speed. To enable to play back the data of different playback system to the correlator, we developed the high-speed time synchronized playback processing system. We carried out the experiments of playing back and correlation for gigabit correlator and VCS trial product so as to confirm the performance of developed time synchronized playback processing system. In case of online and offline playing back experiment for gigabit correlator, we confirmed that the online and offline correlation results were the same. In case of playing back experiment for VCS trial product, we verified that the wide band and narrow band correlation results were also the same. Through the playing back experiments of RVDB system, the effectiveness of developed RVDB system was verified. In this paper, the system design, construction and experimental results are shown briefly.

A software simulator is developed for verifying the VLBI Correlation Subsystem (VCS) trial product hardware. This software simulator includes the delay tracking, fringe rotation, bit-jump, FFT analysis, re-quantization, and auto/cross-correlation functions so as to confirm the function of the VCS trial product hardware. To verify the effectiveness of the developed software simulator, we carried out experiments using the simulation data which is a mixed signal with white noise and tone signal generated by software. We confirmed that the performance of this software simulator is similar as that of the hardware system. In case of spectral analysis and re-quantization experiment, a serious problem of the VCS hardware, which is not enough for expressing the data stream of FFT results specified in VCS hardware specification, was found by this software simulator. Through the experiments, the performance of software simulator was verified to be efficient. In future, we will improve and modify the function of software simulator to be used as a software correlator of Korea-Japan Joint VLBI Correlator (KJJVC).