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Complementary FET로 열어가는 반도체 미래 기술
김상훈,이성현,이왕주,박정우,서동우,S.H. Kim,S.H. Lee,W.J. Lee,J.W. Park,D.W. Suh 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.6
With semiconductor scaling approaching the physical limits, devices including CMOS (complementary metal-oxide-semiconductor) components have managed to overcome yet are currently struggling with several technical issues like short-channel effects. Evolving from the process node of 22 nm with FinFET (fin field effect transistor), state-of-the-art semiconductor technology has reached the 3 nm node with the GAA-FET (gate-all-around FET), which appropriately addresses the main issues of power, performance, and cost. Technical problems remain regarding the foundry of GAA-FET, and next-generation devices called post-GAA transistors have not yet been devised, except for the CFET (complementary FET). We introduce a CFET that spatially stacks p- and n-channel FETs on the same footprint and describe its structure and fabrication. Technical details like stacking of nanosheets, special spacers, hetero-epitaxy, and selective recess are more thoroughly reviewed than in similar articles on CFET fabrication.
이광은(K. E. Lee),느반더(L. V. Tho),김상훈(S. H. Kim),김철기(C. G. Kim),김종오(C. O. Kim) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.4
Amorphous alloys of Co-rich magnetic amorphous films are well known as typical soft magnetic alloys. They are used for many kinds of electric and electronic parts such as magnetic recording heads, transformers and inductors. CoFeHfO thin films were prepared by RF magnetron reactive sputtering. The films were deposited onto Si(100) substrates with a power of 300W at room temperature. The reactive gas was introduced up to 10% (O₂/(Ar + O₂)) during deposition, and the Co<SUB>39</SUB>Fe<SUB>34</SUB>Hf<SUB>9.5</SUB>O<SUB>17.5</SUB> thin film exhibit excellent soft magnetic properties : saturation magnetization (4πM<SUB>s</SUB>) of 19 kG, magnetic coercivity (H<SUB>c</SUB>) of 0.37 Oe, anisotropy field (H<SUB>k</SUB>) of 48.62 Oe, and an electrical property is also shown to be as high as 300 μΩcm. It is assumed that the good soft magnetic properties of Co<SUB>39</SUB>Fe<SUB>34</SUB>Hf<SUB>9.5</SUB>O<SUB>17.5</SUB> thin film results from high electrical resistivity and large anisotropy field.
The Effect of Municipal Consolidation on Urban Manufacturing Productivity
김상훈,김의준,Brian H.S. Kim 서울시립대학교 도시과학연구원 2008 도시과학국제저널 Vol.12 No.2
This paper is focused on analyzing the effect of municipal consolidation on urban manufacturing productivity in Korea. The results indicated that the investments and government expenditures of the consolidated cities have higher impacts on urban labor productivities by generating agglomeration and network economies. Road expansion, on the other hand, generates a negative effect on productivity due to wider market openness from the improvement of spatial accessibility. Urban labor productivity can be maximized when the population size of the consolidated city is between 300,000 and 400,000 people. This size can be applied to setting up a guideline for reorganizing regional administrative units in Korea. This paper is focused on analyzing the effect of municipal consolidation on urban manufacturing productivity in Korea. The results indicated that the investments and government expenditures of the consolidated cities have higher impacts on urban labor productivities by generating agglomeration and network economies. Road expansion, on the other hand, generates a negative effect on productivity due to wider market openness from the improvement of spatial accessibility. Urban labor productivity can be maximized when the population size of the consolidated city is between 300,000 and 400,000 people. This size can be applied to setting up a guideline for reorganizing regional administrative units in Korea.
익형에서의 synthetic jet을 이용한 박리제어 mechanism
김상훈(S.H. Kim),김우레(W. Kim),홍우람(W. Hong),김종암(C. Kim) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
Separation control has been performed using synthetic jets airfoil at high angle of attack. Computed results demonstrated that stall characteristics and control surface performance could be substantially improved by resizing separation vortices. It was observed that the actual flow control mechanism and flow structure is fundamentally different depending on the range of synthetic jet frequency. For low frequency range, small vortices due to synthetic jet penetrated to the large leading edge separation vortex, and as a result, the size of the leading edge vortex was remarkably reduced. For high frequency range, however, small vortex did not grow up enough to penetrate into the leading edge separation vortex. Instead, synthetic jet firmly attached the local flow and influenced the circulation of the virtual airfoil shape which is the combined shape of the main airfoil with the separation vortex. Theses results show the characteristic of unsteady flow of single synthetic jet. Beside, we researched on multi-array synthetic jet to obtain applicable synthetic jet velocity. Multi-location synthetic jet is proposed to eliminate small vortex on suction surface of airfoil. With the results, we concluded that the flow around airfoil is stable by high frequency synthetic jet with elimination of small vortex and confirmation of stable flow. Moreover, performance of multi-array/multi-location synthetic jet can be improved by changing phase angle of multi-location synthetic jet.