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Synthesis of CuInS2 by Sulfide Ion-Exchange of CuIn(OH)5 Precursors
정선호,이상남,차지현,정덕영 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.6
CuInS2 semiconductor was synthesized from CuIn(OH)5 precursors via facile anion exchange in aqueous Na2S solution at room temperature. CuIn(OH)5 was prepared from copper and indium salts and NaOH by co-precipitation in aqueous solution as a polycrystalline. The sulfide exchange reaction did not alter the copper to indium ratio. The reaction resulted in stoichiometric amounts of sulfur in the CuInS2 sample at room temperature. Fourier transform infrared spectra and ion chromatography were used to analyze the impurities, including chloride and nitrate in the prepared samples. CuInS2 showed a chalcopyrite crystal structure after annealing at 500°C under 4% hydrogen-mixed argon atmosphere. The bandgap of the CuInS2 thin film device was estimated to be 1.46 eV.
Framing National and International Disasters: A Case Study of News Coverage on Post-Disaster Relief
정선호 한국인터넷방송통신학회 2023 International journal of advanced smart convergenc Vol.12 No.4
This study compared news coverage of national and international disasters, Hurricane Katrina and the Haiti Earthquake, using textual analysis of The New York Times and The Washington Post. The results reveal that media framing of the historical cases developed in three stages upon the development of post-disaster relief: (1) Call for humanitarian assistance; (2) New Orleans under anarchy and hopelessness vs. Haiti under scrutiny with hope; and (3) Katrina effects. By framing the outcomes of the hurricane as the “Katrina effect,” the media used the disaster as a reference point to explain other economic and political issues. In addition, analysis of relevant statements and press releases confirmed that different social actors involved in the relief process, such as donors, facilitators, and beneficiaries, contributed to the media framing of the issue, although the facilitators were most successful in transferring their own frames to media frames. This study makes important contributions to the field as it looks beyond traditional relationships between quantitative measures of media attention and aid allocation. For governmental and nongovernmental organizations in the area of humanitarian assistance, the findings of this study will assist them in media-relations in the future.