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송준오,김우제 서울産業大學校 2005 논문집 Vol.54 No.1
정보통신의 발달로 대부분의 가정에 처고석 인터넷이 보급되어, 시장의 성숙기에 다다른 지금 사업자들은 온라인 컨텐츠 등의 부가 서비스 등을 통해 고객유치와 고객유지에 사력을 다 하고 있다. 이에 본 연구에서는 고객이 초고속인터넷을 선택하고 사용하는데 있어 사용자들이 만족도를 가지는 부분을 비용, 성능, 고객지원, 부가서비스로 분류하였으며, 이를 다시 세부항목으로 분류하였다. 이를 통해 제품대안들을 평가하고 가장 적합한 제품을 성정할 수 있도록 AHP 기법을 이용하였다. 그 결과 초고속인터넷 사용자들은 비용, 성능, 고객지원, 부가서비스의 순으로 중요도를 선택하였으며, 그 결과 H사의 광랜 상품이 가장 우수한 것으로 나타났다. 또한 본연구에서는 서로 다른 고객들의 성향을 감안하여 민감도 분석을 시행하여 고객이 중요시 하는 각 항목별 비교를 하였다.
n-GaN/vanadium-based Ohmic 접촉 형성
송준오,임동석,김상호,성태연,Song, June-O,Leem, Dong-Seok,Kim, Sang-Ho,Seong, Tae-Yeon 한국재료학회 2003 한국재료학회지 Vol.13 No.9
We investigate vanadium (V)-based Ohmic contacts on n-GaN ($N_{d}$=$2.0${\times}$10^{18}$ $cm^{-3}$ ) as a function of annealing temperature. It is shown that the V (60 nm) contacts become Ohmic with specific contact resistances of $10^{-3}$ $- 10^{-4}$ Ω$\textrm{cm}^2$ upon annealing at 650 and $850^{\circ}C$. The V(20 nm)/Ti(60 nm)/Au(20 nm)contacts produce very low specific contact resistances of $2.2 ${\times}$ 10^{-5}$ and$ 4.0${\times}$10^{-6}$ Ω$\textrm{cm}^2$ when annealed at 650 and $850{\circ}C$, respectively. A comparison shows that the use of the overlayers (Ti/Au) is very effective in improving Ohmic property. Based on the current-voltage measurement, Auger electron spectroscopy, glancing angle X-ray diffraction, and X-ray photoemission spectroscopy results, the possible mechanisms for the annealing temperature dependence of the Ohmic behavior of the V-based contacts are described and discussed.d.
건설기업의 Scope 3 탄소배출량 산정 범위에 대한 고찰
송준오(Song, Jun-Oh),허찬(Heo, Chan),박문서(Park, Moon-Seo),안창범(Ahn, Chang-Bum) 대한건축학회 2024 대한건축학회논문집 Vol.40 No.2
In October 2018, the Intergovernmental Panel on Climate Change (IPCC) recommended limiting global warming to 1.5C and proposed achieving net-zero carbon emissions by 2050. Since then, many countries have declared their commitment to achieving net-zero emissions. Korean government has set a national greenhouse gas reduction target of 40% by 2030 from 2018 levels. Construction companies in Korea are making efforts to calculate their carbon emissions internally for this purpose. However, they are not sufficiently accounting and reporting carbon emissions related to Scope 3 within the construction industry value chain. This research analyzes sustainable management reports of construction companies to identify case studies of Scope 3 carbon reduction and to derive the Scope 3 categories currently being presented. Next, based on survey data provided by the Carbon Disclosure Project (CDP), criteria are established for 1)Amount of emissions, 2) Relevance of data, and 3)Ease of calculation and reliability. The collected data is used to calculate scores for each Scope 3 categories based on the three criteria, and suggest five categories that had highest total score among categories. Using these recommended categories, carbon emissions of over 90% in the construction project value chain are expected to be calculated. In conclusion, the study provides valuable insights into Scope 3 emissions reduction strategies in the construction industry, with a focus on domestic companies. A guideline from scope 3 categories selected by three different evaluations will help companies that evaluate environmental performance and impact investors to have a more objective standard compared to existing methods.
전준우,이상열,송준오,성태연 한국물리학회 2012 Current Applied Physics Vol.12 No.1
We investigated the electrical properties of Cr(30 nm)/Al(200 nm) contacts to N-polar n-type GaN for high-performance vertical light-emitting diodes and compare them with those of Ti(30 nm)/Al(200 nm) contacts. Before annealing, both the samples show ohmic behaviors with a contact resistivity of 1.9e2.3 × 10-4 Ucm2. Upon annealing at 250 ℃ for 1 min in N2 ambient, the Ti/Al contacts become non-ohmic, while the Cr/Al contacts remain ohmic with a contact resistivity of 1.4 × 103 Ucm2. Based on X-ray photoemission spectroscopy and secondary ion mass spectrometry results,ohmic formation and degradation mechanisms are briefly described and discussed.
Fe-Mn-Si 합금에서 집합조직 형성과 이에 따른 형상기억효과의 이방성
신명철,최종술,지광구,송준오,장우양 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.2
This study is aimed at investigating the anisotropy of shape memory effect in Fe-based alloy. An Fe-15Mn-3Si-4Co-5Cr alloy was cold rolled by 92%, and annealed at 630℃ for 46 min. The alloy undergoes γ→ε→α’ transformation by cold rolling and γ is restored with a major preferred orientation of (110)γ[001]γ by the annealing. The specimens for shape memory effect and tensile test were taken 0, 45, 70, 80 and 90 degs to the rolling direction. The specimen taken along 70 degs to the rolling direction exhibits the best shape memory effect. An analysis of the (110)γ[001]γ texture reveals that the specimen experiences the deformation along [221]γ which is the most expandable direction in the γ→ε transformation. In tensile test, the best SME specimen shows the lowest yield stress, indicating that the transformation take place most easily since the deformation is applied to the preferential direction to the deformation.