[en] The interplay between resonant solar neutrino oscillations and neutrino oscillations in laboratory experiments is investigated in a 3 generation model. Due to the assumed hierarchy of neutrino masses, together with their choice of a convenient parameterization of the 3 generation mixing matrix, they can derive a simple analytic formula which reduces the solar neutrino problem to an effective 2 generation problem. The reduction makes it apparent that the allowed range of mixing and mass parameters crucially depend on whether the survival probability of solar neutrinos S satisfies S ≥ 1/3 or not. The formulae for probabilities of laboratory neutrino oscillations are also greatly simplified. They argue that a combination of the observed solar neutrino depletion and data obtained from reactor experiments seems to rule out some range of neutrino masses. If a sizable nu/sub μ/ → nu/sub e/ oscillation is observed at accelerators, as suggested at this Workshop, it severely restricts the range of 2 mixing angles

No abstract available

[en] We argue how the pseudo Dirac scenario for neutrinos leads to rich neutrino oscillation phenomena, including oscillation inside each generation. The pseudo Dirac scenario is generalized by incorporating generation mixings and formulas for the various neutrino oscillations are derived. As an application we compare the formulas with the corresponding data. We find that the observed pattern of mixings, such as almost maximal mixing in the atmospheric neutrino oscillation, is naturally explained in the generalized pseudo Dirac scenario with small generation mixings. We, however, also point out that there remain some problems to be settled for this scenario to be viable. The possible theoretical framework to realize the pseudo Dirac scenario is also briefly commented on

[en] We discuss the theories in the generation and detection of laser-ultrasonics and present the results obtained from the numerical calculations based on the theories. We carry out the computation of the spatial and temporal distributions of the temperature inside the material. Calculating the displacement of the surface at the epicenter, we make discussions on the characteristics of the ultrasonic wave propagation in the thermoelastic and ablation regions. The speed and the surface motion of the material element are investigated from the solution of the Rayleigh equation. We present the results obtained from the numerical computations based on the theories. The Rayleigh waves generated by the irradiation of the pulsed laser beam in the thermoelastic region and the ablation region are discussed. Also the discussions on the heat wave propagation caused by irradiations of the ultra-short laser pulses are included in the appendix

[en] In this project, the experimental study was conducted in a 1kJ-class laser facility. We have been configuring large optical system and performing precise alignment experiments to improve the stability and quality of high energy laser beam. The wavelength converting system was established using a large KDP optics and 1064nm laser pulse with high energy has been converted into 532nm laser pulse. In this experiment, conversion efficiency for second harmonic wave (532nm) was reached up to -30%. The target injector adjustable to the target position in the unit 1 ų was installed in the large spherical chamber. The manufactured monitoring device enable high energy laser beam to be effectively focused onto the target. Various diagnostic tools including x-ray spectrometer, x-ray pinhole camera, faraday cup have been installed to collect data relevant to high energy density plasma. The behavior of the laser-plasma in accordance with the waveform of the laser beam as well as the structure and material of the target has been analyzed using Hyades simulation code. We have investigated the absorbency of the major material used in a nuclear fusion according to the energy distribution of the neutron. The possibility of nuclide conversion caused by neutron capture of radioactive material has been also analyzed.

[en] The calcination process may influence subsequent fragmentation, sintering and swelling when CaO derived from limestone acts as a CO₂ or SO₂-sorbent in combustion, gasification and reforming. Sorbent properties are affected by CO₂ partial pressure, total pressure, temperature, heating rate, impurities and sample size. In this study, the effect of calcination heating rate was investigated based on an electrically heated platinum foil. The effects of heating rate (up to 800 C/s), calcination temperature (700-950 C), particle size (90-180 μm) and sweep gas velocity were investigated. Higher initial heating rates led to lower extents of limestone calcination, but the extents of carbonation of the resulting CaO were similar to each other. Calcium utilization declined markedly during carbonation or sulphation of CaO after calcination by rapid heating. Experimental results show that carbonation and calcium utilization were most effective for carbonation temperatures between 503 and 607 C. Increasing the extent of calcination is not the best way to improve overall calcium utilization due to the vast increase in energy consumption. (author)

[en] An energy security index was developed to measure how the introduction of nuclear power generation improved the national security of energy supply in Korea. The index was designed to incorporate the diversity of energy resources and the dependancy on energy import. Using the developed index, a quantitative effort was made to analyze the relationship between the nuclear power generation and the national energy security. Besides, the energy security indices of several other countries were measured and compared with that of Korea. The energy security index was meaningful in explaining quantitatively the active role of nuclear energy in national energy security which has been mentioned only in a qualitative manner so far

[en] The objective of the study was to make policy-proposes for enhancing the effectiveness and efficiency of national nuclear technology development programs. To do this, recent changes of international nuclear energy policy and trends of nuclear technology R and D was surveyed and analyzed. In the viewpoint of analysis of the changes in the global policy surrounding nuclear technology development and development of national nuclear R and D strategy, this study (1) analyzed the trends of nuclear technology policies and (2) discussed the mid and long term strategy of nuclear energy R and D. To put it in more detail, each subject was further explored as follows; (1) analyzed the trends of nuclear technology policies - Trend and prospects of the international and domestic nuclear policies - Investigation of development of small and medium sized policies - International collaboration for advanced nuclear technologies (2) discussed the mid and long term strategy of nuclear energy R and D - The long term development plan for future nuclear energy system - The facilitation of technology commercialization

[en] The purpose of this study is to develop the model for analyzing the role of nuclear power in the sustainable energy supply future of Korea. For the purpose, an energy-economy interaction model of the computational general equilibrium (CGE) approach was developed. The model is a standard optimization model that maximizes the discounted value of Korean economic utility. The model developed in this study can be contributed to setup the national energy policy

[en] This study analyzes the domestic and foreign nuclear policy and technology issues that are emerging as the recent issues and publishes them as a brief report(BR). This report provides information on nuclear energy to contribute to the enhancement of public acceptance, and aims to build consensus and strengthen communication among nationals, governments and research institutes related to nuclear policy issues. Between July 2018 and August 2018, a total of 9 nuclear policy briefing reports were prepared and distributed to the National Assembly, government departments, universities, research institutes, and the Sejong City Library. This BR can be viewed through our home page and the home page of the Korean Nuclear Society so that users can easily receive information. The writer, the reader, and the editorial committee were constantly communicating in the preparation of this BR's manuscript. By reviewing the experts of related fields of our institute, we improved the quality of manuscript, contributing to providing the right information related to nuclear and provided a channel for communication among various groups. Due to the multidisciplinary nature of nuclear technology, it is not easy to collect comprehensive opinions on nuclear policy issues and to work on them. It is expected that KAERI's continuous publication of the Briefing on Nuclear Policy will become a window for nuclear-related communication