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High thermoelectric power in a NaxCoO2 thin film prepared by sputtering with rapid thermal annealing
이희상,김길호,황덕현,우성일 한국물리학회 2015 Current Applied Physics Vol.15 No.3
NaxCoO2 thin films were fabricated by means of RF-magnetron sputtering. We measured and analyzed the thermal properties and changes of the NaxCoO2 crystal structure by XRD, SEM, Raman spectra, and XPS analyses. Sodium ions diffused from the bulk of the thin film to the surface as the temperature increased. The diffused Na ions reacted with oxygen ions and Na2O was formed on the surface of the thin film, resulting in a decrease of the carrier concentration and a change of the crystal structure from a layer to a spinel structure. The Seebeck coefficient of the NaxCoO2 thin film annealed at 550 ℃ is larger than the value (100 μV/K) for single crystal NaCo2O4.
케이블 텔레비전의 세계-지방 네트워크와 장소의 탈지방화
이희상 한국도시지리학회 2006 한국도시지리학회지 Vol.9 No.1
Cable TV has had its image as a local media based on localism through its centrifugal, decentralised and heterarchical networks. Through investigating the case of Korea, this paper challenges such a utopian and ideological image of cable TV by showing that cable TV can make local places delocalised, deterritorialised and decontextualised through its multiple networks which are centripetal, centralised and hierarchical. I divided the multiple networks of cable TV into three kinds of networks, each being spatially categorised into local, national and global levels: techno-spatial, organisational-spatial, and cultural-spatial networks. The ?techno-spatial networks? are constructed by the institutional shift by the government, and by technologies such as satellite or cable networks, resulting in the synchronisation of cable flows. The ?organisational-spatial networks? are formed through the transactional and organisational relations between media actors in the capital city/region and the other cities/regions, producing power networks between them. Finally, the ?cultural-spatial networks? are made through programme flows, leading to cultural globalisation. Through exploring these multiple networks of cable TV, I argue that cable TV is not a local media but rather a global-local media through which ordinary cities are connected to global-local networks. 케이블 텔레비전은 원심적, 탈집중적, 다원적인 네트워크를 통해 지방주의에 기반한 지방 매체라는 이미지를 갖고 있다. 이 논문은 한국의 사례를 분석하여, 케이블 텔레비전은 구심적, 집중적, 위계적인 다중적 네트워크를 통해 지방적 장소를 탈지방화, 탈영토화, 탈맥락화시킬 수 있다는 것을 보여줌으로써, 케이블 텔레비전의 유토피아적, 이데올로기적 이미지를 비판한다. 본 논문은 케이블 텔레비전의 다중적 네트워크를 세가지 종류로 구분하고, 각각을 지방적, 국가적 그리고 세계적 수준으로 범주화 시킨다. 먼저, ‘기술-공간 네트워크’는 정부에 의한 제도적 변화와 위성 및 케이블 네트워크 기술에 의해 형성되며, 케이블 흐름의 동시화를 야기한다. ‘조직-공간 네트워크’는 수도/권 과 나머지 도시/지역에 있는 미디어 행위자 간의 거래적 및 조직적 관계에 의해 형성되며, 이것은 그들 간의 권력 네트워크를 형성한다. 마지막으로, ‘문화-공간 네트워크’는 프로그램의 흐름에 의해서 형성되며, 문화적 세계화로 이어진다. 케이블 텔레비전의 이와 같은 다중적 네트워크에 대한 분석을 통해, 본 논문은 케이블 텔레비전은 지방 매체이라기보다는 차라리 세계-지방 매체이며, 이를 통해 평범한 도시들이 세계-지방 네트워크에 연결된다는 것을 강조한다.
홈네트워크 산업의 비즈니스 모델과 전략적 제휴: 분석과 제안
이희상,한현수,노승종 한국경영과학회 2006 經營 科學 Vol.23 No.3
Increasing attention has been paid to the home network business in Korea. The rate of growth of the business, however, has not been as high as it was expected. In this study we first categorize the business into three classes of services, with five distinct players. The business models of the five players differ from each other, which in turn keeps the business from visible growth. Based on this observation, we applied business alliance theories to the home network business to find out ways to make the players cooperate with each other. And we proposed five cooperation strategies for three different classes of home network services. Finally we made some suggestions to remove obstacles against business cooperation among the players.