As one of the most severe stress conditions, drought strongly affects the plant growth and productivity. OsPIL1, a gene encoding a rice Phytochrome Interacting Factor (PIF)-Like transcription factor, was found to be down-regulated under drought stress condition. OsPIL1 shows a diurnal expression pattern and known to be involved in regulation of plant height. However, the mechanisms of down-regulation of OsPIL1 expression under stress conditions are remained unclear. In this study, the expression of PIF4 and PIF5, the most homologous genes of OsPIL1 in Arabidopsis, was analyzed and the expression of these genes were found to be oscillated in circadian manner and down-regulated in response to drought and low temperature similar to that of OsPIL1. To identify the regions involved in the responses to drought, low temperature and diurnal cycle, the promoter analysis of PIF4 was performed using transgenic Arabidopsis. Further promoter analysis is ongoing to specify regulatory regions in more detail.

As one of the most severe stress conditions, drought strongly affects the plant growth and productivity. OsPIL1, a gene encoding a rice Phytochrome Interacting Factor (PIF)-Like transcription factor, was found to be down-regulated under drought stress condition. OsPIL1 shows a diurnal expression pattern and known to be involved in regulation of plant height. However, the mechanisms of down-regulation of OsPIL1 expression under stress conditions are remained unclear. In this study, the expression of PIF4 and PIF5, the most homologous genes of OsPIL1 in Arabidopsis, was analyzed and the expression of these genes were found to be oscillated in circadian manner and down-regulated in response to drought and low temperature similar to that of OsPIL1. To identify the regions involved in the responses to drought, low temperature and diurnal cycle, the promoter analysis of PIF4 was performed using transgenic Arabidopsis. Further promoter analysis is ongoing to specify regulatory regions in more detail.

Corrosion is never avoided in the use rf materials with various environments. The underwater hull is normally protected against rusting by several coatings of anti-corrosive paint. The purpose of ICCP(Impressed Current Cathodic Protection) system is to eliminate the rusting or corrosion, which occurs on metal immersed in seawater. This thesis is about the ICCP control and monitoring system, which brings protection against the corrosion of the ship's hull in the sea environments. The test system for ICCP is composed of a power supply, anode, reference electrode and controller. The test system is composed power supply, anode, ref electrode, shunt and etc. The protection current is sent to the protection area though anode. Reference electrode senses whether or not the detected potential is within a range of protection of test equipment and then it is automatically controlled to increase or decrease the amount of protective current to be sent to the anode by controller. The monitoring system with LabView is also detected in order to check the normal state of the system at operation period, because an operator does not always watch over this system and thus the system cannot operate well because rf his or her negligent management. This paper was studied the variation of potential and current density with environment factors, velocity and time, and the experimental results will be explained Also, It is suggested that this system can accommodate a ship's automation for SCMS(Ship Control and Management System) and will be very useful.