An Empirical Approach for Extreme Behavior Identification through Tweets Using Machine Learning

This research was supported by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program. No.10063130, Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1A2C1006159), and MSIT(Ministry of Science and ICT), Korea, under the ITRC(Information Technology Research Center) support program (IITP-2019-2016-0-00313) supervised by the IITP (Institute for Information & communications Technology Promotion), and the 2018 Yeungnam University Research Grant.Peer reviewe

Design of a New Bilayer Multipole Electromagnetic Brake System for a Haptic Interface

This paper deals with the design, simulation and experimental verification of a new bilayer multipole electromagnetic brake. The design utilizes the superposition principle of magnetic flux across the inner and outer layers of axially-oriented electromagnetic poles to provide gradual braking about the single axis of rotation. The braking principle exploits the Coulomb friction between the two rigid contact surfaces. Compared with conventional, multi-pole, multi-layer type radial brakes in haptic applications, the proposed design provides high fidelity of free motion through an absolutely disconnected rotor. The design also provides a wide operating range by delaying the saturation limit of a magnetic circuit for a wide range of input power. In this paper, the analytical model of the brake is derived and compared with the FEM-based simulation results. The optimal design obtained from multi-objective optimization was experimentally verified for its capability in haptic applications.This work was supported by the Technology Innovation Program (or Industrial Strategic Technology Development Program-Artificial intelligence bio-robot medical convergence project) (20001257, Artificial intelligence algorithm based vascular intervention robot system for reducing radiation exposure and achieving 0.5 mm accuracy)—funded by the Ministry of Trade, Industry and Energy(MOTIE, Korea), the Ministry of Health and Welfare(MOHW), the Ministry of Science and ICT (MSIT) and the Korean Evaluation Institute of Industrial Technology (KEIT); the Technology Innovation Program (10052980, Development of micro-robotic system for surgical treatment of chronic total occlusion)—funded by the Ministry of Trade, Industry and Energy (MI, Korea); and the WC300 R&D Program (S2482672)—funded by the Small and Medium Business Administration (SMBA, KOREA)

Memory Operation of Z2-FET Without Selector at High Temperature

This work was supported in part by the REMINDER European Project under Grant 687931; in part by the Ministry of Trade, Industry, & Energy (MOTIE)under Grant 10080526; and in part by the Korea Semiconductor Research Consortium (KSRC) Support Program for the development of future semiconductor devices.The electrical performance of Z2-FET and memory operations of matrix are demonstrated at high temperatures up to 125 ◦C. The sharp subthreshold slope is maintained and the reliable operation is ensured within the memory window of 229 mV even though the turn on voltage of ‘0’- and ‘1’-states are shifted to lower voltage. The ‘0’-state current remains low while the ‘1’-state current gradually increases as the temperature increases leading to higher current margin. At the elevated temperature, the potential barriers are slightly reduced but does not collapse, which leads to the successful memory operation. However, increasing the temperature over 125 ◦C, the potential barrier at the ‘0’-state is significantly reduced and causes the failure of memory operation with high ‘0’-state current. The matrix demonstrates reliable memory operations without using selector circuits even at 125 ◦C.REMINDER European Project 687931Ministry of Trade, Industry, Energy (MOTIE) 10080526Korea Semiconductor Research Consortium (KSRC

Risks of complicated acute appendicitis in patients with psychiatric disorders

Background Acute appendicitis often presents with vague abdominal pain, which fosters diagnostic challenges to clinicians regarding early detection and proper intervention. This is even more problematic with individuals with severe psychiatric disorders who have reduced sensitivity to pain due to long-term or excessive medication use or disturbed bodily sensation perceptions. This study aimed to determine whether psychiatric disorder, psychotropic prescription, and treatment compliance increase the risks of complicated acute appendicitis. Methods The diagnosis records of acute appendicitis from four university hospitals in Korea were investigated from 2002 to 2020. A total of 47,500 acute appendicitis-affected participants were divided into groups with complicated and uncomplicated appendicitis to determine whether any of the groups had more cases of psychiatric disorder diagnoses. Further, the ratio of complicated compared to uncomplicated appendicitis in the mentally ill group was calculated regarding psychotropic dose, prescription duration, and treatment compliance. Results After adjusting for age and sex, presence of psychotic disorder (odds ratio [OR]: 1.951; 95% confidence interval [CI]: 1.218–3.125), and bipolar disorder (OR: 2.323; 95% CI: 1.194–4.520) was associated with a higher risk of having complicated appendicitis compared with absence of psychiatric disorders. Patients who are taking high-daily-dose antipsychotics, regardless of prescription duration, show high complicated appendicitis risks; High-dose antipsychotics for < 1 year (OR: 1.896, 95% CI: 1.077–3.338), high-dose antipsychotics for 1–5 years (OR: 1.930, 95% CI: 1.144–3.256). Poor psychiatric outpatient compliance was associated with a high risk of complicated appendicitis (OR: 1.664, 95% CI: 1.014–2.732). Conclusions This study revealed a close relationship in the possibility of complicated appendicitis in patients with severe psychiatric disorders, including psychotic and bipolar disorders. The effect on complicated appendicitis was more remarkable by the psychiatric disease entity itself than by psychotropic prescription patterns. Good treatment compliance and regular visit may reduce the morbidity of complicated appendicitis in patients with psychiatric disorders.This work was supported by the Technology Innovation Program (or Industrial Strategic Technology Development Program) (20004927, Upgrade of CDM based Distributed Biohealth Data Platform and Development of Verification Technology) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea), and the Bio Industrial Strategic Technology Development Program (20003883) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea), Bio & Medical Technology Development Program of the National Research Foundation of Korea funded by the Ministry of Health and Welfare, Ministry of Science and ICT, Ministry of Trade Industry and Energy (MOTIE, Korea) Disease Control and Prevention Agency (The National Project of Bio Big Data) (NRF‑2020M3E5D7085175), and Bio & Medical Technology Development Program of the National Research Foundation funded by the Ministry of Science & ICT (No. 2021M3A9E408078412)

Industrial Policy and the Development of the Electric Vehicles Industry: The Case of Korea

The Korean government has stimulated R&amp;D activities of the electric vehicle (EV) industry and promoted commercialization of EVs. Korea’s EV industry developed rapidly. The industrial policy to promote the EV industry provides implications to the automobile producers. First, producers not developing EV technologies may lag behind in the market. Second, it is important to improve the efficiency of their R&amp;D expenditures. Third, it may be effective for the less advanced EV producers to cooperate with foreign producers. Fourth, the EV producers are needed to cooperate with the rechargeable battery producers. Fifth, success of the EV industry will depend on the probability of reducing the production cost. Sixth, the government should prepare R&amp;D support measures targeting promotion of SMEs in the EV industry. Seventh, the government wishing to promote the EV industry needs to define the responsibility of each Ministry and establish a system resolving conflicts between the Ministries efficiently

FINANCE MODELING OF A FLOATING OFFSHORE WIND PROJECT IN SOUTH KOREA WITHOUT GOVERNMENT SUBSIDES

The South Korean government is encouraging the active participation of power generation companies in the offshore wind power project by announcing the renewable energy certificates (REC) weighting plan. However, from a long-term perspective, offshore wind power must be able to generate profits without government support to demonstrate its business feasibility and attract the voluntary participation of power generation companies. This is because government support may be subject to change, depending on the internal and external political circumstances of the country. This report calculates the expected costs for a 495 MW floating offshore wind farm in the South Korea’s market environment and examine how the feasibility of the project shifts depending on the country’s current REC weights. Furthermore, this study intends to determine whether floating offshore wind power can generate profits without the Korean government’s support by calculating the expected profit in combination with the green hydrogen project. The net present value (NPV), levelized cost of energy (LCoE) and internal rate of return (IRR) indexes are calculated according to the project’s specific particularities, such as power purchase agreement, REC Weighting, distance from shore and sea depth. Based on this, an index-based comparison is revealed and the margin for profitability for such an investment is discussed

Three essays on inward foreign direct investment and region

Thesis(Doctoral) -- KDI School: Ph.D in Development Policy, 2022The dissertation consists of three essays on FDI and regional economy. Although there are differences in structure and methodology for each essay, each essay is closely related to each other in the following two major directions. First, the essays, focusing on FDI inflow, observe the unbalanced development between the capital area and non-capital area in Korea. Second, the essays in this dissertation are closely linked together as each essay is focusing on each element of the production function below. Y=A*(L, K), where Y refers to the final policy goals pursued by regional economic policies, such as the development of the local economy and the increase of the regional population; and A, L and K represent innovation capacity, human capital and capital investment respectively. More specifically, Chapter 1 is a study on element K. This essay reviews Korea''s balanced regional development policy to narrow the gap between the metropolitan and non-metropolitan areas, and reviews the Korean government''s policy to revitalize FDI, and describes the current status of FDI attraction in nonmetropolitan areas. Chapter 2 is a study on element L. This essay observes how the proportion of highly educated workforces affects the inflow of FDI. In addition, this essay observes how the proportion of highly educated workforces (1) between the manufacturing and service industries, and (2) between the capital area and non-capital area affects differently on the inward FDI attraction performances. Finally, Chapter 3 is a study on element A. This essay observes how the inflow of FDI affects the strengthening of regional innovation capabilities. In particular, this chapter analyzes the difference in the effect of FDI inflow on regional innovation capabilities using an interaction term between non-capital area dummy variables and regional FDI inflow performance. Through series of essays on strengthening regional innovation capabilities through FDI inflow, the importance of human capital to increase FDI inflow and FDI-regional economy related-policies’ improvement, this dissertation hopes to contribute to the balanced development among Korean regions.- Chapter 1: Regional Development and FDI Policies in Korea - Focusing on Imbalanced Development between Capital Area and Non-capital Area - Chapter 2: Human Capital, as a Determinant of FDI - Comparison among Regions and Industries in Korea - Chapter 3: Effect of Inward FDI on Innovation of Korean Regions - Focusing on Spatial and Industrial DifferencedoctoralpublishedSunmin YOO