28 research outputs found
Non-Volatile Majority Function Logic Using Ferroelectric Memory for Logic in Memory Technology
No full textWe demonstrate that a non-volatile majority function logic is formed by a 1T-nC(storage)-1C(read) cell in which a hafnia ferroelectric capacitor is used for computing in memory (CiM) and nonvolatile logic-in-memory (NV-LiM). We show a write operation of low voltage (<3V) and high speed (<20ns), with improved endurance characteristics over 10(11) cycles by adopting a novel write and read method. We performed a circuit-level analysis of an NV 1bit full adder. This adder achieves a power-delay-area product that is 4.8 and 53.5 times higher than the previous FeFET-based 1bit full adder when approximate computing is excluded and applied, respectively.
Design of Physically Unclonable Function Using Ferroelectric FET With Auto Write-Back Technique for Resource-Limited IoT Security
No full textPhysically unclonable function (PUF) is a lightweight encryption technique that generates random digital keys (responses) using intrinsic process variations of devices, which is a promising solution for Internet of Things (IoT) security due to its compatibility with constrained resources. Recent attempts to adopt nonvolatile memory (NVM) into PUFs have enhanced stability through a write-back technique that maintains consistent responses from the enrollment phase even under wide environmental variations by storing the response in the NVM device. However, the stability of the previous NVM PUFs is limited by the low-on/off ratio of the NVMs. In addition, the circuit required to implement the write-back technique poses challenges of increased area and energy consumption. Considering the hardware limitations and power constraints of IoT devices, this article proposes a ferroelectric field-effect transistor (FeFET) PUF as a suitable security solution. The high-on/off ratio of FeFET and the proposed auto write-back technique that does not require additional circuitry realize the stability improvement (a bit error rate of <0.0001%) under wide environmental variations without incurring area and energy overheads. The negligible off current of FeFET prevents static power consumption, which leads to the lowest energy consumption of 6.70e(-15 )J during the response generation of the FeFET PUF. In addition, the compact PUF cell composed of two FeFETs achieves a high density of 87.37 F-2.
Korea Journal, vol. 51, no. 4 (2011)
No full textARTICLES LEE Haeng-hoon / The Historical Semantics of the Modern Korean Concept of Philosophy CHA Hyewon / Was Joseon a Model or an Exception? Reconsidering the Tributary Relations during Ming China Chaisung LIM / The Pandemic of the Spanish Influenza in Colonial Korea CHU Chinoh / Korean Perceptions of Japan during the Great Han Empire and the Japanese Annexation of Korea Andrew S. JOHNSON / Early American Perceptions of Korea and Washington’s Korea Policy, 1882-1905 Sehee HAN, Heaseung KIM,..
Korea Journal, vol. 51, no. 4 (2011)
No full textARTICLES LEE Haeng-hoon / The Historical Semantics of the Modern Korean Concept of Philosophy CHA Hyewon / Was Joseon a Model or an Exception? Reconsidering the Tributary Relations during Ming China Chaisung LIM / The Pandemic of the Spanish Influenza in Colonial Korea CHU Chinoh / Korean Perceptions of Japan during the Great Han Empire and the Japanese Annexation of Korea Andrew S. JOHNSON / Early American Perceptions of Korea and Washington’s Korea Policy, 1882-1905 Sehee HAN, Heaseung KIM,..
Guidelines for designing negotiation interaction to improve sleep hygiene
No full text학위논문(석사) - 한국과학기술원 : 산업디자인학과, 2022.2,[vii, 70 p. :]수면 위생은 수면에 영향을 주는 일련의 행동들에 대한 지침으로, 약물 치료나 병원 진료 없이 수면 위생만으로도 불면증을 해결할 수 있다. 그러나 많은 사용자들이 수면 위생을 따르기 어려워한다. 수면 위생은 사용자의 일상과 부딪히는 경우가 많아, 수면 위생을 지키고자 하는 사용자의 의지가 높지 않기 때문이다. 인간-컴퓨터 상호작용에서는 수면 위생에 대한 사용자의 인식을 높이거나, 자기 성찰에 기반하여 사용자가 수면 위생을 지키도록 시도해왔다. 그러나 사용자들은 여전히 일상과 부딪히는 수면 위생을 의도적으로 지키지 않아왔고, 인간-컴퓨터 상호작용에서는 새로운 접근 방식이 필요하였다. 본 연구에서는 이런 배경을 바탕으로 ‘협상’이라는 사용자와 인텔리전트 시스템 간의 새로운 인터랙션 방식으로 사용자의 수면 개선 실천을 돕고자 한다. 본 연구에서는 문헌 연구로부터 사용자의 헬스케어를 도울 수 있는 협상 인터랙션의 정의를 이끌어 냈다. 특별히 수면 위생 컨텍스트에서 협상 인터랙션의 고려사항을 알아내기 위해 다이어리 스터디를 진행하였다. 다이어리 스터디를 바탕으로 사용자의 수면 위생 실천을 돕기 위한 협상 인터랙션을 구체화하고, 사용자 경험을 조사하기 위한 협상 인터랙션 경험 프로토타입을 제작하였다. 수면 위생 실천을 돕는 협상 인터랙션의 각 단계별 사용자 경험을 관찰하여 협상 인터랙션 디자인 가이드라인을 제안하였다.한국과학기술원 :산업디자인학과
The Impact of Covid-19 and its policy response on Korea's export
No full textThesis(Master) -- KDI School: Master of Public Policy, 2021The lockdown policies, which are composed of various measures like workplace closing, cancel public events, stay-at-home requirements, are adopted to block the transmission of COVID-19. It may succeed in blocking the infections, but it has negative impacts on the global economy in terms of production and consumption. In this research, the author tries to focus on the impacts of COVID-19 and its policy responses on Korea’s exports by using COVID-19 case and death data, policy response data from OxCGRT, immobility data from Google. The importing countries’ COVID-19 and the policy responses have negative impacts on Korea’s exports even though some of the indicators are not statistically significant. Also the country groups such as OECD, EU, ASEAN, and OPEC have shown the mitigation of negative impacts of COVID-19 and its policy responses and immobility. Korea’s COVID-19 situation, its policy responses and immobility in the workplace have positive impacts on Korea''s exports. The author also tries to check the baseline’s results by doing the estimation with product division, adding time-lag variables, and dividing the region by capital and non-capital area and confirms that the direction of coefficients except medical industries. This study contributes to suggest rough ideas about the impact of lockdown measures on Korea’s exports.I. Introduction
II. Literature Review
III. Model and Data
IV. Estimation Results
V. Robustness Check
VI. Conclusion
VII. References
VIII. AppendixmasterpublishedSehee KI
Fabrication of Spherical Titania Inverse Opal Structures Using Electro-Hydrodynamic Atomization
No full textSpherical PS/HEMA opal structure and spherical titania inverse opal structure were fabricated by self-assembly of colloidal nanoparticles in uniform aerosol droplets generated with electro-hydrodynamic atomization method. When a solution of PS/HEMA nanoparticles with uniform size distribution was used, PS/HEMA nanoparticles self-assembled into a face-centered cubic (FCC) structure by capillary force with the evaporation of the solvent in aerosol droplet, resulting in a spherical opal structure. When PS/HEMA nanoparticles and anatase titania nanoparticles were dispersed simultaneously into the solution, titania nanoparticles with relatively smaller size were assembled at the interstitial site of PS/HEMA nanoparticles packed in the FCC structure, resulting in a spherical opal composite structure. Spherical titania inverse opal structure was fabricated after removing PS/HEMA nanoparticles from the spherical opal composite structure by calcination
Anat as a precursor of Lady Wisdom in Proverbs 8:22–31
No full textThis dissertation investigates the identity of Lady Wisdom, the enigmatic figure in Proverbs 8:22–31. The presupposition of this investigation is a widely shared expert interpretation, namely, that Lady Wisdom is a multifaceted female divine figure whose origin and characteristics are interwoven with those of a number of ancient Near Eastern goddesses. The main contribution of this project is to argue that the Ugaritic goddess Anat be considered a possible precursor of Lady Wisdom. According to the author, a fluid and complementary relationship exists between Lady Wisdom’s depiction in the Hebrew Bible and Anat’s depiction in ancient Near Eastern religions, especially since certain aspects of their origin, status, and function are similar. The project also sheds light on the pivotal role of Lady Wisdom as a co-creator and mediator of the heavens and the earth. She should be regarded as a co-creator who is an active and mobile participant in God’s creative work; she is found not only in Proverbs but also in other biblical and deuterocanonical traditions. Moreover, she is a perfect mediator not only between the creation traditions and wisdom literature but also between the divine and human realms. Her mysterious identity is manifested in her own words and in others’ descriptions of her. Humans can either accept or reject Lady Wisdom, but only those who recognize and appreciate her divine knowledge are able to embrace truth in their lives
Evaluation of Road Transport Pollutant Emissions from Transporting Building Materials to the Construction Site by Replacing Old Vehicles
No full textSince the life cycle of a building spans more than 50 years, studies of the environmental impacts in the construction industry have focused on reducing the energy consumption and greenhouse gas emissions during the operation and maintenance phase. The products of the construction industry are assembled using various building materials manufactured outside of the construction site. Consequently, it is essential that the manufactured building materials be transported to the construction site using various types of transportation methods. However, there is a lack of studies that assess the pollutant emissions of road transport while executing a construction project. The purpose of this study is to investigate the changes in the road pollutant emissions when the old diesel vehicles for transporting building materials are replaced according to enhanced pollutant emission regulations. In this study, we found that approximately 89, 64, 77, and 64% of NOx, VOC, PM, and CO, respectively, were emitted during transportation of building materials as a proportion of the emissions during the construction of the structure. The analyzed results also show that about 10, 35, 23, and 35% of NOx, VOC, PM, and CO, respectively, were generated from material transportation as a proportion of the emissions from finishing the work. It is expected that a reduction in pollutant emissions from transporting building materials of up to approximately 64, 39, 49, and 27% of NOx, VOC, PM, and CO, respectively, can be achieved when vehicles registered before 2003 are replaced with ones that adhere to the tightened regulations
Effect of Surface Modifications on Electrochemical Performance of NMC811
No full textThe benefits of all-solid-state batteries(ASSBs) like safety, energy density, etc. are often touted but rarely realized. The biggest bottleneck in achieving high energy density is on the cathode side. High nickel-content cathode materials are now considered the most promising candidates for achieving the energy requirements, but they still have many shortcomings including poor cycling stability, especially when cycled at high voltage vs Li/Li+. Through this work, the author hopes to encourage the commercialization of energy-dense Li-ion batteries via the development of surface coatings to enhance the electrochemical properties of and protect the cathode material during cycling in an all-solid-state cell.
First, we utilized a nanometer layer coating of a lithium-ion conducting solid electrolyte, lithium phosphorus oxynitride (LiPON) by using RF-magnetron sputtering. The LiPON layer provides interfacial stability at high voltages, suppresses the growth of impedance with cycling, and improves the rate capability. Thicker coatings showed a negative impact on the performance of the cells owing to the increase in electronic resistance with increasing thickness of the LiPON layer.
To further progress our work, the problem of electrolyte decomposition was tackled by reducing the amount of conductive additive in the cathode composite and compensating for the loss in electronic conductivity by applying an amorphous polyacrylonitrile (PAN) coating on the surface of NMC811 followed by a simple heat treatment in air. The electrochemical properties and cycling performance of the cathode were improved by the mixed conducting nature of the cyclized PAN and its ability to coat the active materials due to its polar nature. Lastly, the heat treatment of PAN was further optimized by introducing oxygen gas during the stabilization of PAN coating via heat treatment. High initial discharge capacity was achieved with this work along with improvement in cyclability. The author expects this work to have a broad impact on the battery community and may pave the way for the eventual commercialization of the all-solid-state Li-ion cell.</p
