Publications by authors named "Je-Ho Lee"

Article Synopsis
  • Structural imperfections in TMDs can both help and hinder their excitonic properties, affecting valley polarization.
  • In center-nucleated vertical heterobilayers, defects are healed, leading to reduced defect-related photoluminescence and more stable valley polarization, especially for lower-lying excitons.
  • However, at low temperatures, valley depolarization becomes significant due to defect state hybridization, and the study also explores how electron doping impacts this process.
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Nutmeg is the seed derived from . Nutmeg seeds contain alkylbenzene derivatives such as myristicin, which are toxic to the human organism, and lignan compounds such as nectandrin B, which possess anti-aging and anti-diabetic properties. However, the anti-adipogenic, prolipolytic and anti-inflammatory effects of lignan-enriched nutmeg extract (LNX) on preadipocytes remain unclear.

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Vertical type II van der Waals heterobilayers of transition metal dichalcogenides (TMDs) have attracted wide attention due to their distinctive features mostly arising from the emergence of intriguing electronic structures that include moiré-related phenomena. Owing to strong spin-orbit coupling under a noncentrosymmetric environment, TMD heterobilayers host nonequivalent + and - valleys of contrasting Berry curvatures, which can be optically controlled by the helicity of optical excitation. The corresponding valley selection rules are well established by not only intralayer excitons but also interlayer excitons.

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Anisotropic triangular antiferromagnets can host two primary spin excitations, namely, spinons and triplons. Here, we utilize polarization-resolved Raman spectroscopy to assess the statistics and dynamics of spinons in CaReOCl. We observe a magnetic Raman continuum consisting of one- and two-pair spinon-antispinon excitations as well as triplon excitations.

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Gallium Telluride (GaTe), a layered material with monoclinic crystal structure, has recently attracted a lot of attention due to its unique physical properties and potential applications for angle-resolved photonics and electronics, where optical anisotropies are important. Despite a few reports on the in-plane anisotropies of GaTe, a comprehensive understanding of them remained unsatisfactory to date. In this work, we investigated thickness-dependent in-plane anisotropies of the 13 Raman-active modes and one Raman-inactive mode of GaTe by using angle-resolved polarized Raman spectroscopy, under both parallel and perpendicular polarization configurations in the spectral range from 20 to 300 cm.

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Van der Waals (vdW) heterostructures, consisting of a variety of low-dimensional materials, have great potential use in the design of a wide range of functional devices thanks to their atomically thin body and strong electrostatic tunability. Here, we demonstrate multi-functional indium selenide (InSe)/black phosphorous (BP) heterostructures encapsulated by hexagonal boron nitride. At a positive drain bias (V), applied on the BP while the InSe is grounded, our heterostructures show an intermediate gate voltage (V) regime where the current hardly changes, working as a ternary transistor.

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Background: The demand for implementing a new listing scheme to expedite patient access to novel oncology drugs has increased in South Korea. This study was conducted to compare the prices of anticancer drugs between eight countries and to explore the feasibility of a 'pre-listing and post-evaluation' scheme to expedite patient access to oncology drugs.

Methods: This study included 34 anticancer drugs, which were reimbursed between 1 January 2007 and 31 December 2017.

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The long stagnation of the photo-conversion efficiency of kesterites below 13% is a source of frustration in the scientific community. In this study, we investigated the effects of sodium on the passivation of grain boundaries and defects in CuZnSnSe (CZTSe) grown on a soda-lime glass (SLG) and borosilicate (BS) glass. Because BS glass does not inherently contain sodium, we placed a thin layer of NaF between CZTSe and Mo.

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Background: The cellular senescence of primary cultured cells is an irreversible process characterized by growth arrest. Restoration of senescence by ginsenosides has not been explored so far. Rg3() treatment markedly decreased senescence-associated β-galactosidase activity and intracellular reactive oxygen species levels in senescent human dermal fibroblasts (HDFs).

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Article Synopsis
  • The bilayer solar steam generator (BSSG) utilizes a SnSe-SnSe layer on a glassy carbon foam to efficiently convert solar energy into steam, offering low-cost solutions for power generation and water treatment.
  • The system benefits from high photothermal conversion, minimal heat loss due to low thermal conductivity, and effective water transport through capillary action, leading to an impressive evaporation rate of 1.28 kg/m²h and efficiency of 84.1%.
  • With strong recyclability and durability over multiple steam-generation cycles, the BSSG is positioned as a viable technology for practical applications in various eco-friendly processes.
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Band-like transport behavior of H-doped transition metal dichalcogenide (TMD) channels in field effect transistors (FET) is studied by conducting low-temperature electrical measurements, where MoTe , WSe , and MoS are chosen for channels. Doped with H atoms through atomic layer deposition, those channels show strong n-type conduction and their mobility increases without losing on-state current as the measurement temperature decreases. In contrast, the mobility of unintentionally (naturally) doped TMD FETs always drops at low temperatures whether they are p- or n-type.

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High quality gallium sulfide II (GaS) and gallium sulfide III ([Formula: see text]) thin films on [Formula: see text]/Si substrates were simultaneously grown by using physical vapor deposition with GaS powder as a single precursor. By controlling the substrate temperature, we can selectively grow either GaS or GaS thin films on SiO/Si substrates. Relatively high and low substrate temperature conditions resulted in GaS and GaS thin films, respectively.

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Objective: The aim of this study was to evaluate the clinicopathological features of minimal deviation adenocarcinoma (MDA) and to analyze its prognostic factors.

Methods: We retrospectively analyzed the medical records of 17 patients who were diagnosed with MDA at a single institution between January 2005 and December 2015.

Results: The median age of the patients was 47.

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Article Synopsis
  • - The study aimed to evaluate how often germline mutations occur in patients with peritoneal carcinoma (PC) or fallopian tube carcinoma (FTC) by using a multi-gene panel for testing.
  • - Researchers analyzed DNA from 26 patients diagnosed between 2013 and 2016, identifying mutations with a special sequencing method and verifying them with another technique.
  • - They found BRCA1/2 mutations in 23.1% of patients, mostly in those with PC, and detected several variants of uncertain significance, concluding that the mutation prevalence is similar to that in ovarian cancer patients.
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Objective: The aim of the present study was to investigate unclassified variants (UVs) in BRCA1 and 2 of Korean patients with ovarian cancer.

Methods: We retrospectively analyzed 138 patients diagnosed with ovarian/fallopian tubal/peritoneal cancer between January 2013 and January 2016, whose BRCA genetic test results and clinical characteristics were available for review. Patient peripheral blood lymphocyte specimens were assessed for BRCA mutations and variations by direct sequencing.

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Article Synopsis
  • The study aimed to assess the long-term outcomes of surgical treatments for discoid lateral meniscus (DLM) and identify factors influencing clinical and radiological results.
  • A total of 11 articles involving 422 DLM cases were analyzed, highlighting that most studies showed favorable clinical outcomes, although some concerns regarding the methodological quality were noted.
  • Findings indicated that while the majority of knees experienced minimal degenerative changes, factors like older age at surgery and specific surgical techniques were linked to an increased risk of degenerative changes over time.
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Objective: To compare the oncologic and obstetric outcomes in reproductive-age females with borderline ovarian tumors (BOTs) treated with cyst enucleation (CE) or unilateral salpingo-oophorectomy (USO).

Methods: The medical records of patients with BOTs treated between 1998 and 2014 were retrospectively reviewed. The recurrence rates in the USO and CE groups were compared, and the postoperative obstetric outcomes were assessed via telephone survey.

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Insulin-like growth factor-binding protein 5 (IGFBP-5) plays a role in cell growth, differentiation, and apoptosis. In this study, we found that IGFBP5 was markedly downregulated in ovarian cancer tissue. We investigated the functional significance of IGFBP-5 as a tumor suppressor.

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Objectives: The aim of this study was to evaluate the clinicopathologic features of placental site trophoblastic tumors (PSTTs) in Korea.

Methods/materials: Twenty patients given a diagnosis of PSTT in Korea (1990-2013) were evaluated retrospectively, including 14 patients identified through a literature review and 6 patients identified through a medical chart review of a single institution. The analysis included patient age, antecedent pregnancies, time since antecedent pregnancy, presenting symptoms, serum β-human chorionic gonadotropin level, International Federation of Gynecology and Obstetrics stage, treatment, outcome, and follow-up.

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Objectives: To investigate and analyze the BRCA mutations in Korean ovarian cancer patients with or without family history and to find founder mutations in this group.

Methods/materials: One hundred two patients who underwent a staging operation for pathologically proven epithelial cancer between January 2013 and December 2014 were enrolled. Thirty-two patients declined to analyze BRCA1/2 gene alterations after genetic counseling and pedigree analysis.

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Background And Objective: We aimed to evaluate responses to photodynamic therapy (PDT) and its long-term efficacy in preserving normal anatomy and function in women with premalignant lesions of the lower genital tract.

Study Design/materials And Methods: Fifteen patients received PDT for vulvar intraepithelial neoplasia (VIN), vaginal intraepithelial neoplasia (VAIN), or vulvar Paget's disease between January 2003 and December 2013. Patients underwent colposcopy and/or vulvoscopy for assessment of lesions.

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Aim: To evaluate prognostic factors in Korean patients with endometrial cancer.

Methods: A retrospective analysis was conducted on 248 patients who were staged surgically at the Samsung Medical Center between 1995 and 2004. Survival data were analyzed using Kaplan-Meier estimates, and multivariate analysis was performed using the Cox regression method.

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The p53 tumor suppressor function can be compromised in many tumors by the cellular antagonist HDM2 and human papillomavirus oncogene E6 that induce p53 degradation. Restoration of p53 activity has strong therapeutic potential. Here, we identified TSC-22 as a novel p53-interacting protein and show its novel function as a positive regulator of p53.

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