• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2008.06a
• /
• pp.461-462
• /
• 2008

• Journal of the Korean Society of Hazard Mitigation
• /
• v.9 no.3
• /
• pp.101-106
• /
• 2009

Although ADCP(Acoustic Doppler Current Profiler) have been introduced and utilized for flow measurements since the end of 1990's, in-situ behavior performance of ADCP at stream gauging stations has not been evaluated in Korea. The purpose of this study is for verification and application of velocity measurements using a price meter and ADCP. The verification of measured velocities was carried out in a laboratory open-channel. The differences between the two velocity values measured by a pirce meter and ADCP are within 2.1%, which means that ADCP can be used at stream gauging stations. After verification, ADCP was applied to the Maekok stream selected as a test site for application. for application. The test application was performed by comparison of velocity results measured by ADCP and a price meter. Results show that the velocity values obtained by using ADCP coincide well with those by using conventional devices with the average measurement discrepancy of 10.5%.

• The Journal of the Korean Institute of Forest Recreation
• /
• v.22 no.4
• /
• pp.11-22
• /
• 2018

This study analyzes the economic feasibility on the transition of production structure to increase income for a local forest village in Laos PDR. The study area was the Nongboua village in Sangthong district where the primary product is rice from rice paddy. Possible strategies were considered to increase the villagers' revenue, and Noni (Morinda citrifolia) was production in the short-term. We assumed that the project period was for 20 years for the analysis, and a total of 1,100 Noni tree was planted in 1 ha by $3m{\times}3m$ spacing. This study classified basic scenario one, scenario two, scenario three by the survival rate and purchase pirce of Noni. Generally Noni grows well. However, the seedlings' average survival rate (= production volume) was set up conservatively in this study to consider potential risks such as no production experience of Noni and tree disease. The scenario one assumed that the survival rate of Noni seedlings was 50% for 0-1 years, 60% for 0-2 years, and 70% for 3-20 years; the scenario two, 10% less, i.e., 40%, 50%, and 60%; and the scenario three, 10% less, i.e., 40%, 50%, 60% and purchase price 10% less, i.e., $0.29 to $0.26, respectively. Our analysis showed that all 3 scenarios resulted in economically-feasible IRR (internal rate of return) of 24.81%, 19.02%, and 16.30% of with a discounting rate of 10%. The B/C (benefit/cost) ratio for a unit area (1ha) was also analyzed for the three scenarios with a discounting rate of 10%, resutling in the B/C ratio of 1.71, 1.47, and 1.31. The study results showed that the Nongboua village would have a good opportunity to improve its low-income structure through planting and managing alternative crops such as Noni. Also the results can be used as useful decision-making information at a preliminary analysis level for planning other government and public investment projects for the Nonboua village.