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An Algorithmic Approach to Radioports Placing in Pico-cell Environment
Jeongtae Kim,Soyoung Park,Kwanghee Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Cell planning typically aims at optimizing coverage, capacity and quality of service by locating radioports. In certain cases coverage and capacity can be conflicting criteria, and their integration into a single cost function may turn out to be inefficient. Such situations frequently happen when the area of concern is small-sized. To solve this difficulty, we proposed a clustering algorithm. An example of network optimization in a small-sized or pico-cell area is presented and the effectiveness of the suggested algorithm is demonstrated.
Kim Jeongtae,Yoon Sungho,Kim Dongwook 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
In this study, an assessment technique to determine the polarity reversal characteristics of LCC Type HVDC XLPE cable insulation materials was considered. For this purpose, the long-term polarity reversal experiment was performed using molded electrodes that can exclude the eff ects of surface discharge and surrounding insulating oil on the specimen for the 3 diff erent kinds of specimens such as AC XLPE, VSC type DC XLPE and LCC type DC XLPE under the electrical and thermal stress. As a result, in the cases of low applied electric fi eld of 3 E 0 (75 kV/mm), all kinds of specimens with diff erent experimental conditions such as electric fi eld magnitude and temperature showed very large lifetime index in the E-N (applied electric fi eld vs. polarity reversal cycle) characteristics. From Weibull statistical analysis, the shape parameter was smaller than 1, which corresponds to the early failure mode or the random failure mode. It was analyzed that the magnitude of the applied electric fi eld and temperature did not give an eff ect to the polarity reversal lifetime. Through the lightning impulse breakdown analysis for the survived specimens up to 1050 polarity reversal cycles, the impulse strength was decreased by thermal degradation rather than electrical degradation. Among the three types of specimens applied in this study, the scale parameter of the LCC type DC XLPE material was more than 1000 cycles, showing the best polarity reversal characteristics. From the above analysis, it is concluded that the polarity reversal lifetime for DC insulation material can be evaluated through the process and the electrode confi guration as-suggested in this study.
Jeongtae Kim,배영한 재단법인 서암순창장학회 2017 Journal of Marketing Thought Vol.4 No.2
Reinforcing global competitiveness of the pharmaceutical industry through development of new drugs is a key task and target for pharmaceutical industry and government. As part of this goal, Korea government has been dedicating to an implementation of various systems since 2000s in order to correct the wrong practices of the industries and to reduce national medical expenses. The sliding scale rebate-medical reimbursement system in 2009, Dual punishment of a rebate in 2010 and the Sunshine Act in 2018 would have contributed to a competitive environment that the pharmaceutical companies can strive for a development of new products and its quality improvement rather than focus on appealing to financial benefits to the hospitals, clinics and pharmacies. In particular, the government has cut down the price of original drugs and generic drugs sharply, of which patents have expired through the reorganized reimbursement policy and the advancement policy of the pharmaceutical industry since 2012, thereby reinforcing ability to block the source of provision of a rebate and to further promote research and development. However, there are still many unexpected side effects in the process of establishing the system because of not having sufficient competitiveness in new drug development. For example, the domestic companies have been forced into a co-marketing of the original products for short-term sales outcome and obtaining prescription records by granting the modified profit. Wholesale profit has been reduced due to squeezed distribution margins. In this study, we will explore alternatives to these major adverse events and suggest ways to improve them through collaboration between industries or industry and government.
Jeongtae Kim,Meejung Ahn,Yuna Choi,Poornima Ekanayake,Gi‑Ok Kim,Taekyun Shin 경희대학교 융합한의과학연구소 2020 Oriental Pharmacy and Experimental Medicine Vol.20 No.1
We evaluated the antifibrotic effects of fermented black radish (FBR) on carbon tetrachloride (CCl4)-induced chronic liver injury in rats. Serum biochemical analysis indicated that FBR treatment attenuated the upregulation of alanine aminotransferase and aspartate aminotransferase. Moreover, Sirius red staining and histopathological examination revealed decreased fibrosis and inflammation in FBR-treated rats compared with CCl4 + vehicle-treated rats. Western blot analysis of alpha-smooth muscle actin expression levels confirmed the downregulation of fibrosis in the FBR treatment group compared with the CCl4 + vehicle treatment group. These results suggest that FBR treatment suppressed liver fibrosis in CCl4-exposed rats.
Jeongtae Kim,Jiyoon Chun,Meejung Ahn,Kyungsook Jung,Changjong Moon,Tae-Kyun Shin 대한해부학회 2022 Anatomy & Cell Biology Vol.55 No.1
Experimental autoimmune uveitis (EAU), an animal model of human uveitis, is characterized by infiltration of autoimmune T cells in the uvea as well as in the retina of susceptible animals. EAU is induced by the immunization of uveitogenic antigens, including either retinal soluble-antigen or interphotoreceptor retinoid-binding proteins, in Lewis rats. The pathogenesis of EAU in rats involves the proliferation of autoimmune T cells in peripheral lymphoid tissues and breakdown of the blood-retinal barrier, primarily in the uvea and retina, finally inducing visual dysfunction. In this review, we describe recent EAU studies to facilitate the design of a therapeutic strategy through the interruption of uveitogenic factors during the course of EAU, which will be helpful for controlling human uveitis.
Recent Advancements in Technologies to Detect Enterohaemorrhagic Escherichia coli Shiga Toxins
Kim Jeongtae,Lee Jun Bong,Park Jaewon,Koo Chiwan,Lee Moo-Seung 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.5
Shiga toxin (Stxs)-producing enterohaemorrhagic Escherichia coli (EHEC) and Shigella dysenteriae serotype 1 are major causative agents of severe bloody diarrhea (known as hemorrhagic colitis) and hemolytic uremic syndrome (HUS) associated with extraintestinal complications such as acute renal failure and neurologic impairment in infected patients under 9 years of age. Extreme nephrotoxicity of Stxs in HUS patients is associated with severe outcomes, highlighting the need to develop technologies to detect low levels of the toxin in environmental or food samples. Currently, the conventional polymerase chain reaction (PCR) or immunoassay is the most broadly used assay to detect the toxin. However, these assays are laborious, time-consuming, and costly. More recently, numerous studies have described novel, highly sensitive, and portable methods for detecting Stxs from EHEC. To contextualize newly emerging Stxs detection methods, we briefly explain the basic principles of these methods, including lateral flow assays, optical detection, and electrical detection. We subsequently describe existing and newly emerging rapid detection technologies to identify and measure Stxs.
Development of a PLD heater for continuous deposition and growth of superconducting layer
Jeongtae Kim,Insung Park,Gwan Tae Kim,Taekyu Kim,Hong Soo Ha 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.2
Superconducting layers deposited on the metal substrate using the pulsed laser deposition process (PLD) play a crucial role inexploring new applications of superconducting wires and enhancing the performance of superconducting devices. In order toimprove the superconducting property and increase the throughput of superconducting wire fabricated by pulsed laser deposition,high temperature heating device is needed that provides high temperature stability and strong durability in high oxygen partialpressure environments while minimizing performance degradation caused by surface contamination. In this study, new heating device have been developed for PLD process that deposit and growth the superconducting materialcontinuously on substrate using reel-to-reel transportation apparatus. New heating device is designed and fabricated using iron-chromium-aluminum wire and alumina tube as a heating element and sheath materials, respectively. Heating temperature of theheater was reached over 850 ℃ under 700 mTorr of oxygen partial pressure and is kept for 5 hours. The experimental resultsconfirm the effectiveness of the developed heating device system in maintaining a stable and consistent temperature in PLD. Theseresearch findings make significant contributions to the exploration of new applications for superconducting materials and theenhancement of superconducting device performance.