서울대학교 램프사업단

Light pollution exposure during pregnancy and risk of childhood strabismus

admsnulamp — Mon, 18 May 2026 19:22:41 +0000

Abstract Purpose To explore the association between cumulative exposure to outdoor artificial light at night (O-ALAN) during pregnancy and risk of childhood strabismus.Methods In this nationwide population-based case-control study, an entire-South-Korean-population mother-child-pair cohort representing births for the years 2008 to 2011 and residing in urban areas was identified based on the National Health Insurance Service (NHIS) database. Average levels of O-ALAN at the residential addresses of mothers during pregnancy were estimated using time-varying satellite data, providing a composite view of persistent nighttime illumination at approximately a similar to 1 km2 scale. The odds ratios (ORs) and 95% confidence intervals (CIs) for the association between O-ALAN and strabismus risk were calculated using maximum likelihood estimation, adjusting for socio-demographic and area-based risk factors (e.g., nighttime traffic noise, particulate matter <= 10 mu m).Results The study included 755,796 mother-child pairs (mean [SD] maternal age, 32.4 [3.9] years; 51.9% boys). An interquartile range (IQR) increase in O-ALAN (21.7 nW/cm2/sr) was associated with an OR of 1.159 (95% CI: 1.145, 1.172) for childhood strabismus. The exposure-response curve showed a non-linear pattern, with stronger associations at higher exposure levels (approximately 40 nW/cm2/sr). Sub-analysis revealed a significant association for exotropia (OR: 1.179 [95% CI: 1.158, 1.200]), but not for esotropia (OR: 1.011 [95% CI: 0.977, 1.045]) or vertical strabismus (OR: 1.107 [95% CI: 0.982, 1.250]).Conclusion Higher levels of residential O-ALAN during pregnancy were associated with increased risk of childhood strabismus in this cohort. Further research with more detailed information on exposure and potential mediators is warranted. DOI: 10.1177/11206721251389516

Discovery of a New Tetrahydroquinoline-Based Chemotype for STING Inhibition with In Vivo Efficacy against Acute Kidney Injury

admsnulamp — Mon, 18 May 2026 19:16:46 +0000

Abstract Aberrant activation of the stimulator of interferon genes (STING) drives excessive type I interferon and inflammatory responses implicated in autoimmune and inflammatory diseases, including acute kidney injury (AKI). Here, we report the discovery of a tetrahydroquinoline-based STING inhibitor chemotype, represented by KSI-028, that expands the limited scaffold diversity of current small-molecule STING inhibitors. Mechanistic studies suggest that KSI-028 engages STING through a noncanonical, likely allosteric, binding mode with sustained target engagement. KSI-028 potently suppressed STING-dependent signaling and reduced type I interferon and pro-inflammatory cytokine production in both murine and human cells. In a cisplatin-induced AKI mouse model, KSI-028 attenuated renal and hepatic injury and down-regulated STING-associated inflammatory gene expression. These findings establish the tetrahydroquinoline scaffold as a promising foundation for the development of next-generation STING inhibitors with alternative target engagement modes for the treatment of STING-driven inflammatory disorders. DOI: 10.1021/acs.jmedchem.6c00162

Nanoscale Mapping of Plasmonic Charge Transport in Nano-Resonators Based on Resistive Switching Materials

admsnulamp — Fri, 24 Apr 2026 16:35:45 +0000

Abstract Metamaterials-based nano-resonators have been extensively studied due to their precise controllability for tuning electromagnetic waves, while it is difficult to map the effects of resonating-light on electrical-transport. Here, conductivities and the effects of charge-traps with nanoscale resolutions are mapped in Ge2Sb2Te5 (GST)-based nano-resonator under resonant excitations. In this strategy, a high electric-field out of surface-plane is applied through a conducting nano-probe, and the probe scans to induce a phase-transition. Results implicate an insulating-to-conducting-phase transition induced by electric-field, due to the formation of filament-like conducting-paths. Utilizing contrasting electrical and optical properties of conducting- and insulating-phases, nano-resonators are fabricated on the surface of GST. Then, plasmonic-conductivities and the effects of charge-trap in nano-resonators are mapped. Nano-resonators with linear-gratings show plasmonic photocurrent upon illumination at selective-wavelengths depending on grating-elements. Contrarily, square-shaped nano-resonators effectively produce plasmonic effects on a broad wavelength range due to the large number of available modes, as evident from plasmonic-wave simulations. Importantly, plasmonic effects prohibit the re-trapping of carriers, resulting in dramatically low trap densities. Moreover, simulation shows that plasmonic effects are pronounced at short-wavelengths, providing high plasmonic-conductivities and low charge-trap densities. The mapping of plasmonic-transport properties can have significant impacts on basic research and applications of phase-change material-based-plasmonic devices. http://dx.doi.org/10.1002/adfm.202520251

Ethnicity or convenience? The effect of claims on Chinese consumers' hedonic and emotional responses to Korean ethnic home-meal

전지현 — Thu, 09 Apr 2026 17:18:19 +0000

Abstract

Presenting ethnic food with appropriate claims may help to reduce consumers' reluctance to try them by increasing familiarity and evoking positive emotions. This study examined how claims influence Chinese consumers' hedonic and emotional responses to Korean ethnic home-meal-replacement products. Chinese consumers residing in China (n = 156) rated their acceptance and emotional responses to two Korean ethnic foods (Tteokbokki and Japchae) under different claim conditions before and after tasting. The experimental claims emphasized the ethnic origin or convenience of food. Claim, sample, and tasting significantly affected overall liking, with a significant claim × tasting interaction indicating that claim effects were dependent on the evaluation stage. When no claim was provided, overall liking increased after tasting, suggesting that sensory experience recalibrated initially low expectations. In contrast, when claims were present, liking was elevated prior to tasting and remained stable thereafter. Claim effects were more pronounced for the less familiar product, Japchae, whereas liking for the more familiar product, Tteokbokki, remained relatively stable across tasting stages. Regarding emotional responses, the convenience-related claim significantly decreased ratings of secured, while the ethnicity-related claims elicited heightened high arousal emotion such as curious and tempting before tasting. Overall, these findings suggest that claims primarily influence expectations and emotional responses before tasting, while their effects on hedonic acceptance are moderated by tasting stage and product familiarity.

http://dx.doi.org/10.1016/j.foodres.2026.119039

Generalized Fréchet means with random minimizing domains and its strong consistency

전지현 — Thu, 09 Apr 2026 17:05:23 +0000

SUMMARY This paper introduces a novel extension of Fréchet means, referred to as generalized Fréchet means, as a comprehensive framework for describing the characteristics of random elements. The generalized Fréchet mean is defined as the minimizer of a cost function, and the framework encompasses various extensions of Fréchet means that have appeared in the literature. The most distinctive feature of the proposed framework is that it allows the domain of minimization for the empirical generalized Fréchet means to be random and different from that of its population counterpart. This flexibility broadens the applicability of the Fréchet mean framework to various statistical scenarios, including sequential dimension reduction for non-Euclidean data. We establish a strong consistency theorem for generalized Fréchet means and demonstrate the utility of the proposed framework by verifying the consistency of principal geodesic analysis on the hypersphere. http://dx.doi.org/10.1093/biomet/asag002

The finite-difference parquet method: Enhanced electron-paramagnon scattering opens a pseudogap

전지현 — Thu, 09 Apr 2026 17:00:19 +0000

Abstract

We present the finite-difference parquet method that greatly improves the applicability and accuracy of two-particle correlation approaches to interacting electron systems. This method incorporates the nonperturbative local physics from a reference solution and builds all parquet diagrams while circumventing potentially divergent irreducible vertices. Its unbiased treatment of different fluctuations is crucial for reproducing the strong-coupling pseudogap in the underdoped Hubbard model, consistent with diagrammatic Monte Carlo calculations. We reveal a strong-coupling spin-fluctuation mechanism of the pseudogap with decisive vertex corrections that encode the enhanced, energy-dependent scattering amplitude between electrons and antiferromagnetic spin fluctuations.

http://dx.doi.org/10.1073/pnas.2525308123

The AGORA High-resolution Galaxy Simulations Comparison Project. X. Formation and Evolution of Galaxies at the High-redshift Fr

전지현 — Thu, 09 Apr 2026 16:53:37 +0000

Abstract Recent observations from the James Webb Space Telescope have revealed unexpectedly luminous galaxies, exhibiting stellar masses and luminosities significantly higher than predicted by theoretical models at Cosmic Dawn. In this study, we present a suite of cosmological zoomed-in simulations targeting high-redshift (z ≥ 10) galaxies with dark matter halo masses in the range 10¹⁰–10¹¹M_⊙ at z = 10, using state-of-the-art galaxy formation simulation codes (Enzo, Ramses, Changa, Gadget-3, Gadget-4, and Gizmo). This study aims to evaluate the convergence of the participating codes and their reproducibility of high-redshift galaxies with the galaxy formation model calibrated at relatively low redshift, without additional physics for high-redshift environments. The subgrid physics follows the AGORA CosmoRun framework, with adjustments to resolution and initial conditions to emulate similar physical environments in the early Universe. The participating codes show consistent results for key galaxy properties (e.g., stellar mass), but also reveal notable differences (e.g., metallicity), indicating that galaxy properties at high redshifts are highly sensitive to the feedback implementation of the simulation. Massive halos (M_halo≥5 × 10¹⁰ M_⊙ at z = 10) succeed in reproducing observed stellar masses, metallicities, and UV luminosities at 10 ≤ z ≤ 12 without requiring additional subgrid physics, but tend to underpredict those properties at higher redshift. We also find that varying the dust-to-metal ratio modestly affects UV luminosity of simulated galaxies, whereas the absence of dust significantly enhances it. In future work, higher-resolution simulations will be conducted to better understand the formation and evolution of galaxies at Cosmic Dawn.

http://dx.doi.org/10.3847/1538-4357/ae4a23

A Surrogate-Calibrated Updating Method for Logistic Regression With Missing Covariates

전지현 — Thu, 09 Apr 2026 16:41:10 +0000

ABSTRACT Missing covariates are a common challenge when applying an existing logistic regression model to new or external datasets, particularly in the context of model updating. While regression calibration and model updating methods have been developed to address such partial data availability, each has limitations in terms of bias, variance, and sensitivity to model misspecification. In this study, we propose a surrogate-calibrated updating (SCU) method that integrates calibration and updating approaches to improve the efficiency and reliability of coefficient estimation in the presence of missing covariates. The SCU method leverages surrogate covariates—variables that are routinely available across old and new datasets and correlate with the missing covariates—and applies a weighted averaging scheme that combines information from both fully observed and partially observed data sources. This approach mitigates bias while reducing variance, offering a practical and robust alternative to existing methods in population updating setting. We provide a theoretical justification and derive the corresponding estimators and variances. Simulation studies demonstrate the method’s favorable performance under various scenarios, including the case with model misspecification. The SCU method is further illustrated using data from the Framingham Heart Study, where diabetes history serves as a surrogate for partially observed glucose levels in assessing cardiovascular disease risk. http://dx.doi.org/10.1002/sim.70489

A Digital Tool for Assessing the Distinct Effects of Depression, Anxiety, and Attention-Deficit/Hyperactivity Disorder (ADHD) o

전지현 — Thu, 09 Apr 2026 16:33:57 +0000

Abstract Background: Emotional wellness and healthy neurocognitive development are crucial from early childhood. An imbalance in attentional and emotional regulation system is associated with an increased risk of depression, anxiety, and attention-deficit/hyperactivity disorder (ADHD). Early assessment of these risks is essential, but it is difficult to conduct cognitive tests that are both child-friendly and able to dissociate different behavioral biases. Objective: This study aimed to develop a digital app–based tool designed for young children to objectively assess cognition-affect interactions and examine the association with standardized scales for anxiety, depression, and ADHD. Methods: In this cross-sectional study, 78 healthy children (36 female) aged 4-10 (mean 7.2, SD 1.4) years with no history of mental illness were recruited from the local community center and children’s museum. Emotional regulation and attentional control were assessed using an animated emotional Flanker task, emotional Stroop task, and emotional Go/No-Go task on a touchscreen computer. Children’s current mental health was measured using self-reported depression and anxiety states through the Center for Epidemiological Studies Depression Scale for Children (CES-DC) and State-Trait Anxiety Inventory for Children (STAI-CH), while the ADHD risk was assessed using the Korean ADHD Rating Scale (K-ARS) for parents. Principal component analysis was applied to behavioral measures across the tasks to group them by similarities and extract 3 abstract scores (“E-scores”) representing different aspects of cognitive function (attention, selective inhibition, and emotional sensitivity). Associations between E-scores and mental health or ADHD risk were then tested. Results: There was a significant improvement in general attention across development (Pearson correlation between E-score 1 and age: r=–0.75; P<.001; 2-sided α=.05) but not emotion-attention interactions. Performance was also correlated with mental health scales. First, children with higher depression symptoms (ie, higher CES-DC) were slower in their responses in general (ie, higher E-score 1; Pearson correlation after controlling for age: r=0.29; P=.04). Second, both anxious and depressed (ie, higher STAI-CH and CES-DC) children demonstrated reduced attention selectively to the emotional stimuli as indicated by elongated RT and lower accuracy (ie, higher E-score 2; anxiety: r=0.34; P=.02; depression: r=0.51; P<.001). Lastly, children with higher ADHD scales (ie, higher Korean ADHD Rating Scale [K-ARS]) showed lower accuracy across the three tasks, particularly for emotional stimuli (ie, lower E-score 3; r=–0.32; P=.03). Conclusions: By combining well-established emotional cognitive tasks with our dimensionality reduction techniques, we extracted individual affective-cognitive characteristics from diverse but noisy behavioral patterns and identified their association with mental health and ADHD-related symptoms in children. These results demonstrate the scientific validity, versatility, and translational potential of our gamified digital assessment tool for monitoring young children’s affective and cognitive health in daily life. Future longitudinal studies in children with formal clinical diagnoses will further strengthen the generalizability of these findings. http://dx.doi.org/10.2196/86286

Which is most thermally comfortable in a hot and dry environment: Hijab, niqab, or burqa?

전지현 — Thu, 09 Apr 2026 16:23:39 +0000

Abstract Hijabs, niqabs, and burqas are widely worn by Muslim women in hot climates, however, comparative studies on their thermo-physiological effects remains scarce. This study investigated the physiological and subjective responses to wearing a Hijab, niqab, and burqa in a hot-dry environment. Ten healthy Indonesian females (28.8 ± 3.0 y, 160.6 ± 4.6 cm, and 53.4 ± 4.4 kg) completed three trials (hijab, niqab, and burqa) dur‑ ing exercise at an air temperature of 36 °C and an air humidity of 30%RH with radiation on the ceiling (globe temperature at 70 °C, wet-bulb globe temperature at 36.5 °C). Rectal, auditory canal, mean skin temperature, total sweat rate, and heart rate did not differ significantly among the three headwear types. However, the maximum temperature at the back of the neck tended to be lower with the niqab than with the burqa, but the difference was not significant (p = .053). The microclimate tempera‑ ture inside the chest was significantly higher with the burqa than with the other two conditions (p < .001). Remarkably, the microclimate temperature at the top of the head rose to maximum 71 ± 9, 72 ± 6, and 73 ± 8 °C for the hijab, niqab, and burqa, respec‑ tively, with no significant differences. Both the niqab and burqa increased breathing resistance and often caused facial discomfort due to fabric contact with the nose and eyes. While the niqab provided more neck ventilation than the hijab or burqa, both the niqab and burqa impose additional breathing burdens during exercise in hot environments. http://dx.doi.org/10.1186/s40691-026-00462-1

Singular systems of linear forms over global function fields

전지현 — Tue, 17 Mar 2026 14:35:21 +0000

Abstract

In this paper, we consider singular systems of linear forms over global function fields of class number one and give an upper bound for the Hausdorff dimension of the set of singular systems of linear forms by constructing an appropriate Margulis height function on the space of lattices over global function fields. (c) 2026 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies. http://dx.doi.org/10.1016/j.jnt.2026.01.010

q-DEFORMED GAUSSIAN UNITARY ENSEMBLE: SPECTRAL MOMENTS AND GENUS-TYPE EXPANSIONS

전지현 — Tue, 17 Mar 2026 14:20:41 +0000

Abstract. The eigenvalue probability density function of the Gaussian unitary ensemble permits a q-extension related to the discrete q-Hermite weight and corresponding q-orthogonal polynomials. A combinatorial counting method is used to specify a positive sum formula for the spectral moments of this model. The leading two terms of the scaled 1/N2 genus-type expansion of the moments are evaluated explicitly in terms of the incomplete beta function. Knowledge of these functional forms allows for the smoothed leading eigenvalue density and its first correction to be determined analytically. http://dx.doi.org/10.1090/tran/9622

Dissociable age-dependent effects of emotion on scene and location memory

전지현 — Mon, 09 Mar 2026 12:27:44 +0000

Abstract

Aging is associated with a decline in binding memories to their spatial context, including both spatial locations and background scenes. However, because emotions can enhance or impair memory depending on the type of spatial context, we investigated the effects of emotional modulation on spatial location and scene memory in adults between 21 and 67 years of age. 165 adults (83 female) were tested on their memory of scenes composed of emotional (or neutral) foreground images superimposed on neutral backgrounds, presented in one quadrant of the screen. In case of mental health-related individual variability, we also administered self-report surveys of depression and anxiety. First, we found that memory for the emotional foreground was more accurate but at the expense of the background scene. Across aging, we observed a decline in scene memory, particularly with positive foreground images. In contrast with memory for scenes, emotion enhanced memory for spatial location (the quadrant in which the scene was presented), but this benefit significantly decreased with age. Together, these findings provide evidence that aging not only impairs episodic memory accuracy overall but also alters the way in which emotions influence contextual binding. Finally, although we found that depression was correlated with poor memory and anxiety with better memory, neither significantly interacted with its emotional modulation. http://dx.doi.org/10.1038/s41598-026-37242-2

Evaluating AI-aided approaches for 18F-FDG PET quantification: Indirect synthetic MR-based versus direct partial volume correct

전지현 — Wed, 25 Feb 2026 13:48:49 +0000

ABSTRACT Compatible deployment of AI-aided methods for PET quantification is an important prerequisite to maximizing their benefits. We focus on partial volume correction (PVC), which can substantially improve the precision of radiotracer uptake quantification in brain PET for intricate and atrophic regions. Conventional postreconstruction PVC requires anatomical MR images that are often unavailable or of inadequate quality. We address this limitation by systematically evaluating two AI-aided strategies: (1) indirect PVC, which uses syn thesized MR images for anatomical guidance, and (2) direct PVC, which predicts corrected PET images without anatomical processing. Multiple AI architectures were assessed under both strategies, using paired 18 F-FDG PET + CT + MR datasets from multiple scanner sites. Indirect PVC consistently outperformed direct approaches across all tested architectures with the Denoising Diffusion Probabilistic Model yielding the best overall per formance while preserving compatibility with standard PET processing pipelines. Both AI-aided approaches increased the utility of standalone 18 F-FDG PET in clinical and research applications without requiring anatomical MR images. Indirect PVC showed advantages in transparency and performance for quantification in smaller anatomical regions, whereas direct PVC may be more suitable for rapid assessment in larger brain regions. http://dx.doi.org/10.1016/j.neuroimage.2026.121756

Velocity dispersion functions of pressure-supported galaxies in EAGLE simulations with varying active galactic nucleus feedback

전지현 — Wed, 25 Feb 2026 13:40:36 +0000

ABSTRACT We investigated the stellar velocity dispersion functions (VDFs) of pressure-supported galaxies in the EAGLE cosmological simulations. The central stellar velocity dispersion is one of the fundamental dynamical tracers of the total mass of galaxy subhalos, alongside luminosity and stellar mass. Because it reflects the gravitational potential, the stellar velocity dispersion is expected to be relatively insensitive to feedback from active galactic nuclei (AGNs), a critical process that regulates the connection between other galaxy observables and subhalo masses. To examine the impact of AGN feedback, we analyzed the VDFs from five EAGLE simulation runs, each adopting a different AGN feedback model: one “standard”, two “enhanced”, one “reduced”, and one with no AGN feedback. We computed the stellar velocity dispersions of pressure-supported galaxies using member stellar particles, mimicking fiber spectroscopy. The VDFs from the standard and enhanced AGN feedback models show little difference. However, contrary to our initial expectation that the VDF shape would be largely insensitive to AGN feedback, the simulations with reduced and no AGN feedback show a significant excess of high velocity dispersion galaxies (σ ∗ > 200 km s −1 ) and a deficit of low velocity dispersion galaxies (100 < σ ∗ (km s −1 ) < 200), compared to those with standard or enhanced AGN feedback. The presence of high velocity dispersion galaxies in the no-AGN model arises from enhanced central star formation, due to the absence of AGN-driven gas heating or expulsion. Our results demonstrate that the shape of the theoretical VDF is sensitive to the strength of AGN feedback. These predictions offer a theoretical benchmark for future observational studies of the galaxy VDF using large-scale spectroscopic surveys. http://dx.doi.org/10.1051/0004-6361/202556640

Non-Abelian charge conversion in bilayer binary honeycomb lattice systems

전지현 — Wed, 25 Feb 2026 13:30:10 +0000

Abstract

In two-dimensional systems with space-time inversion symmetry, Dirac nodes (DNs) carry non-Abelian topological charges, which induce an intriguing momentum space braiding phenomenon. Although the original idea was proposed in condensed matter setup, the experimental verification of non-Abelian charge conversion has been limited to artificial metamaterials because of the difficulty in identifying suitable materials in which controlled tuning of DN positions is possible. In this work, we propose bilayer binary honeycomb lattices (BBHLs) as a material platform to study the non-Abelian charge conversion phenomenon in which DN positions in momentum space can be manipulated. More explicitly, we demonstrate that layer sliding and vertical pressure serve as tunable braiding parameters controlling the non-Abelian charge conversion process, which is crucial to understand the stacking-dependent electronic properties of BBHL systems. We show that the BBHL systems are a promising candidate for the experimental realization of non-Abelian phenomena of DNs in condensed matter. http://dx.doi.org/10.1103/3pnm-76hh

General M-estimators of location on Riemannian manifolds: Existence and uniqueness

전지현 — Wed, 25 Feb 2026 13:22:33 +0000

Abstract

We study general M-estimators of location on Riemannian manifolds, extending classical notions such as the Fréchet mean by replacing the squared loss with a broad class of loss functions. Under minimal regularity conditions on the loss function and the underlying probability distribution, we establish theoretical guarantees for the existence and uniqueness of the associated population M-functional and the corresponding sample M-estimators. In particular, we provide sufficient conditions under which the population minimizer set is nonempty and reduces to a singleton, and under which the corresponding sample M-estimator is likewise uniquely defined. Our results offer a general framework for robust location estimation in non-Euclidean geometric spaces and unify prior uniqueness results under a broad class of convex losses. http://dx.doi.org/10.1016/j.spl.2026.110670

Characterization of the Commercial Spectrograph System for Astronomical Observations: PIXIS 1300BX Camera and IsoPlane 320A Spe

전지현 — Wed, 25 Feb 2026 13:11:06 +0000

Abstract We present the result from a comprehensive laboratory and on-sky characterization of the commercial spectrograph system consisting of a PIXIS 1300BX charge-coupled device (CCD) camera and an IsoPlane 320A spectrograph as part of the preparation of the forthcoming all-sky spectroscopic survey of nearby galaxies (A-SPEC). In the laboratory, we have quantified readout noise, dark current, gain, and full-well capacity via bias, dark, and photon transfer curve analysis at all acquisition modes. To do that, we have developed a gradient correction technique to address row-dependent signal gradients in the image, which are caused by the shutter-less condition of our CCD camera test setup. The technique successfully reproduces the values in the manufacturer specifications. We also have measured quantum efficiency exceeding 80% from 400–800 nm and ≳ 90% between 450–750 nm, with sub-second persistence decay, making it ideal for rapid, multi-object spectroscopy. Using a set of diffraction gratings (150, 300, and 600 gr mm⁻¹), we have evaluated the spatial separability of multiple spectra and spectral resolution. We have conducted a test observation with this spectrograph system at the Seoul National University Astronomical Observatory (SAO) 1 m telescope and successfully demonstrated its capability of multi-object spectroscopy with moderate resolution of R ≈ 600–2600. We release all Python codes for the test and recipes to facilitate further instrument evaluations. http://dx.doi.org/10.5303/JKAS.2026.59.1.11

Genome-wide detection of fine-scale population stratification and long-distance dispersal of the Chinese mitten crab (Eriocheir

전지현 — Tue, 10 Feb 2026 10:39:31 +0000

ABSTRACT Understanding the population genetic structure of marine decapods is essential for their effective conservation and management, particularly for species like the Chinese mitten crab (Eriocheir sinensis), which exhibits a complex life cycle and high invasive potential. In this study, we applied a population genomics approach using SLAF-seq to generate genome-wide SNP data from 120 unrelated individuals collected across six locations in China and Korea. We found a fine-scale but discernible level of genetic differentiation by regional populations correlated with geography. Individuals from Seocheon (Korea) and Wenzhou (southeastern China) exclusively share a distinct genetic ancestry component that makes them divergent from the rest, which we speculate may have been introduced by hybridization with congeneric species. We detected genetic outliers (9 out of 120 individuals) that show ongoing long-distance dispersal along the coastline of the Yellow Sea, likely happening during the planktonic larval phase. Collectively, our findings provide a genomic basis for delineating management strategies, supporting informed stock enhancement, and guiding region-specific conservation efforts for E. sinensis across East Asia. http://dx.doi.org/10.1080/19768354.2026.2619207

A New Collision Avoidance Fiber Assignment Algorithm for Robotic Fiber Positioners in Multi-Object Spectroscopy

전지현 — Tue, 10 Feb 2026 10:24:07 +0000

Abstract We present a new fiber assignment algorithm for a robotic fiber positioner system in multi-object spectroscopy. Modern fiber positioner systems typically have overlapping patrol regions, resulting in the number of observable targets being highly dependent on the fiber assignment scheme. To maximize observable targets without fiber collisions, the algorithm proceeds in three steps. First, it assigns the maximum number of targets for a given field of view without considering any collisions between fiber positioners. Then, the fibers in collision are grouped, and the algorithm finds the optimal solution resolving the collision problem within each group. We compare the results from this new algorithm with those from a simple algorithm that assigns targets in descending order of their rank by considering collisions. As a result, we could increase the overall completeness of target assignments by 10% with this new algorithm in comparison with the case using the simple algorithm in a field with 150 fibers. Our new algorithm is designed for the All-sky SPECtroscopic survey of nearby galaxies (A-SPEC) based on the K-SPEC spectrograph system, but can also be applied to similar fiber-based systems with heavily overlapping fiber positioners. http://dx.doi.org/10.5303/JKAS.2026.59.1.1