Publications by authors named "Dae Hwan Kim"

Owing to their excellent electrical and mechanical properties, carbon nanotube thin-film transistors (CNT-TFTs) have emerged as promising candidates for high-performance TFTs. In particular, the long mean free path and quasi-ballistic transport characteristics of charge carriers in CNT make the contact properties a critical factor in device performance. As a result, significant research has been conducted on extracting the contact resistance in CNT-TFTs.

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Background/aim: is a key regulator of hepatocellular carcinoma (HCC) progression, that promotes cell adhesion, migration, and activation. However, its transcriptional regulation remains poorly understood. This study aimed to elucidate the role of , a secreted regulator of the signaling pathway, in expression and its functional implications in tumor progression.

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In this study, we present a novel implementation of a physical unclonable function (PUF) using a carbon nanotube (CNT) network-based field-effect transistor (FET) with a lateral dual-gate structure. The lateral dual-gate CNT FET device leverages the inherent randomness of the CNT network formed during the deposition process, allowing for the generation of unique, unclonable encryption keys. By using dual independent gates, this device achieves a quaternary state implementation, enhancing security within the same device footprint compared with traditional binary bit PUFs.

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Cancer-associated fibroblasts (CAFs) promote the malignant phenotype of cancer through crosstalk with tumor and immune cells within the tumor microenvironment. Therefore, the mechanisms underlying CAF activation require in-depth study to develop strategies targeting CAFs during cancer immunotherapy. In this study, we investigated the role of FGFR4 in CAF regulation in colon cancer.

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Study Design: Retrospective image analysis study.

Objective: To propose a novel classification system for adolescent idiopathic scoliosis (AIS) curvature using unsupervised machine learning and evaluate its reliability and clinical implications.

Summary Of Background Data: Existing AIS classification systems, such as King and Lenke, have limitations in accurately describing curve variations, particularly long C-shaped curves or curves with distinct characteristics.

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Chitinase-3-like 1 (CHI3L1) is a key factor in regulating inflammatory processes and development of rheumatoid arthritis (RA) since is highly produced by synoviocytes and macrophages in the development RA. Collagen-induced arthritis (CIA) model is the most widely used because its pathogenesis is similar to human RA. Thus, we aimed to investigate if anti-CHI3L1 antibody could reduce RA development in the CIA model.

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This paper reviews various design approaches for sensing schemes that utilize silicon nanowire (SiNW) ion-sensitive field-effect transistors (ISFETs) for pH-sensing applications. SiNW ISFETs offer advantageous characteristics, including a high surface-to-volume ratio, fast response time, and suitability for integration with complementary metal oxide semiconductor (CMOS) technology. This review focuses on SiNW ISFET-based biosensors in three key aspects: (1) major fabrication processes and device structures; (2) theoretical analysis of key performance parameters in readout circuits such as sensitivity, linearity, noise immunity, and output range in different system configurations; and (3) an overview of existing readout circuits with quantitative evaluations of N-type and P-type current-mirror-based circuits, highlighting their strengths and limitations.

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In this study, we analyze the characteristics of fast transient drain current () in IGZO-based field-effect transistors (FETs) with different composition ratios (device O: ratio of 1:1:1 for In, Ga, Zn, device G: ratio of 0.307:0.39:0.

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This study optimizes V and ΔV in amorphous indium-gallium-zinc-oxide (a-IGZO) field-effect transistors (FETs) by examining the influence of both channel length (L) and Ga composition. It was observed that as the ratio of In: Ga: Zn changed from 1:1:1 to 0.307:0.

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Article Synopsis
  • * Twelve prehypertensive and hypertensive men participated in a trial that included either aerobic exercise or IPC before exercise, with various cardiovascular metrics monitored throughout the experiment.
  • * Results showed that while combining the two interventions did not change blood pressure or heart rate responses, IPC helped maintain baroreflex sensitivity post-exercise and led to lower blood pressure during sleep compared to aerobic exercise alone.
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Controlling the microenvironment surrounding the pluripotent stem cells (PSCs) is a pivotal strategy for regulating cellular differentiation. Surface nanotopography is one of the key factors influencing the lineage-specific differentiation of PSCs. However, much of the underlying mechanism remains unknown.

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  • This paper studies how different structures in ferroelectric thin-film transistors (FeTFTs) affect their ability to switch and store memory.
  • Researchers tested two main types of structures: one for memory operation (MFSM) and another that showed one-time memory operation (MFS).
  • They found that changes in the materials used, especially related to how oxygen moves, affect how well these transistors work over time, leading to memory loss and performance issues.
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  • The study investigates the learning curve for hand-assisted laparoscopic living donor nephrectomy (HLDN) done by a trained gastrointestinal surgeon, analyzing data from 96 patients over ten years.
  • Researchers categorized the surgeon’s experience into three phases (novice, development, competency) based on operation times and assessed the results using the cumulative sum (CUSUM) method.
  • Findings showed that operation times decreased significantly across the phases, indicating improved efficiency, with about 30 cases needed to attain proficiency, while complications did not vary significantly among the groups.
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Background: Increased Galectin 3-binding protein (LGALS3BP) serum levels have been used to assess hepatic fibrosis stages and the severity of hepatocellular carcinoma (HCC). Considering the crucial role of transforming growth factor-β1 (TGF-β1) in the emergence of these diseases, the present study tested the hypothesis that LGALS3BP regulates the TGF-β1 signaling pathway.

Methods: The expression levels of LGALS3BP and TGFB1 were analyzed in patients with metabolic dysfunction-associated steatohepatitis (MASH) and HCC.

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  • The study investigates a new management protocol for patients with ruptured abdominal aortic aneurysms (rAAAs) undergoing surgery, aiming to improve patient survival rates.
  • The protocol includes strategies such as controlled low blood pressure, limited fluid resuscitation, immediate extubation post-surgery, and an open abdomen technique with follow-up operations.
  • Results showed that while most patients regained consciousness and had some recovery, complications such as renal issues and colon ischemia were noted, leading to a 15.4% in-hospital mortality rate.
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  • The study investigates the role of anti-CHI3L1 antibodies in preventing skin inflammation caused by chitinase-3-like 1 (CHI3L1) during atopic dermatitis development.
  • Results showed that the antibodies reduced symptoms like epidermal thickening and inflammatory cytokine levels in both animal models and reconstructed human skin.
  • The findings suggest that targeting CHI3L1 could be a promising therapy for atopic dermatitis, potentially more effective than existing treatments like IL-4 antibodies.
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In this paper, the floating body effect (FBE) in indium-gallium-zinc-oxide (IGZO) thin-film transistor (TFT) and the mechanism of device failure caused by that are reported for the first time. If the toggle AC pulses are applied to the gate and drain simultaneously for the switching operation, the drain current of IGZO TFT increases dramatically and cannot show the on/off switching characteristics. This phenomenon was not reported before, and our study reveals that the main cause is the formation of a conductive path between the source and drain: short failure.

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Carbon nanotube networks (CNTs)-based devices are well suited for the physically unclonable function (PUF) due to the inherent randomness of the CNT network, but CNT networks can vary significantly during manufacturing due to various controllable process conditions, which have a significant impact on PUF performance. Therefore, optimization of process conditions is essential to have a PUF with excellent performance. However, because it is time-consuming and costly to fabricate directly under various conditions, we implement randomly formed CNT network using simulation and confirm the variable correlation of the CNT network optimized for PUF performance.

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  • The relationship between schizophrenia and cancer development is debated, with the tumor necrosis factor receptor (TNFR) potentially playing a key role in both conditions.
  • Studies on TNFR2 knockout mice showed reduced tumor size and schizophrenia-like behaviors, indicating TNFR2's impact on these diseases.
  • The administration of brain-derived neurotrophic factor (BDNF) in TNFR2 knockout mice increased tumor growth and schizophrenia-like behaviors, suggesting that TNFR2 mediates the link between lung cancer and schizophrenia through TrkB-dependent BDNF levels.
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Background: This study aimed to evaluate the clinical outcomes and efficacy of enhanced recovery after surgery (ERAS) protocol in patients undergoing distal gastrectomy for gastric cancer (GC).

Methods: Patients were randomly assigned to the ERAS group (EG) and the conventional care group (CG) by stratified randomization according to age and sex. The primary endpoint was adjusted postoperative hospital stay, calculated using discharge criteria developed to evaluate recovery.

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Carbon nanotube (CNT) network channels constructed using a high-purity CNT solution for use in CNT thin-film transistors have the advantages of the possibility of requiring a low-temperature process and needing no special equipment. However, there are empty spaces between individual CNTs, resulting in unexpected effects. In this study, double-gate (DG) CNT network transistors were fabricated and measured in four different configurations to observe the capacitive coupling effects between the top gate (TG) and bottom gate (BG) in the DG structure.

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Article Synopsis
  • - This study investigates Petersen's hernia, which can occur after specific types of stomach surgeries, and compares two methods for preventing bowel obstruction caused by this hernia: the conventional defect closure method and the newer mesenteric fixation method.
  • - Conducted as a randomized controlled trial in Korea, the research includes patients with diagnosed gastric cancer who have undergone certain types of surgical anastomosis and aims to determine the effectiveness of each method in preventing bowel obstruction over a three-year period.
  • - Results from this trial are expected to provide valuable insights on the efficacy and safety of the mesenteric fixation method, potentially establishing it as a superior technique for closing Petersen's defects.
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With the inherent sleep and wake cycle regulated by natural sunlight, the human body has evolved over millennia to be active during the day and to rest at night. However, maintaining an optimal 24 h cycle has become increasingly problematic in modern society as more people spend the majority of the day indoors. Many research groups have reported that inadequate artificial lighting interferes with melatonin production and disrupts the circadian rhythm.

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Due to the short storage period, large quantities of platelet concentrate (PC) are expiring. The expired PC cannot be injected into a blood vessel, but the activity of bioactive molecules, especially growth factors, is still preserved. In this paper, we organized a process to obtain a growth factor-rich bioproduct for use as a supplement in human cell culture by optimizing freezing, thawing, and sterilization conditions.

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