Ken I. Takahashi

Simulating Stratiform Precipitation With Embedded Convection in High‐Elevation Valleys Using LES: The Role of Topographic Detail

Steven Chavez, Jose Flores Rojas, Ken I. Takahashi, Yamina Silva

Abstract Precipitation dynamics in high‐elevation valleys of the central Andes are strongly modulated by complex terrain, which alters local circulation and cloud development. Here, we use the Cloud Model 1 (CM1) in large‐eddy simulation (LES) mode with a two‐moment microphysics scheme to …

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1037P Real-world outcomes of treatment patterns in recurrent and advanced primary salivary gland–type tumors of the lung (PSGTL): A multicenter retrospective study (NEJ068)

Y. Masui, S. Kataoka, Takehito Shukuya, Takuo Hayashi et autres

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150 GHz-band Coreless High Multilayer Antenna-in-Package for 6G

Hiroshi Taneda, Naoki Kuroiwa, Kei Murayama, Makoto Tsukahara et autres

In recent years, data have been exchanged by communication terminals everywhere in our daily lives, and the development of low-latency communication technologies for use in medical devices, factory automation, and autonomous driving has been gaining momentum. In order to meet the increasing …

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Impact of Extreme Droughts on the Water Balance in the Peruvian–Ecuadorian Amazon Basin (2003–2024)

Daniel Martínez-Castro, Jhan Carlo Espinoza, Ken I. Takahashi, Miguel Octavio Andrade et autres

This study assesses the impact of extreme droughts on the surface and atmospheric water balance of the Peruvian Amazon basin during 2003–2024. It extends previous work by incorporating multiple datasets for precipitation (CHIRPS, MSWEP, and ERA5) and evapotranspiration (ERA5, GLDAS, Amazon-Paca, and …

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Forecasting austral summer precipitation along the western coast of South America (WCSA)

Juan Sulca, Ken I. Takahashi

Abstract Forecasting precipitation could help prevent flooding and drought disasters along the western coast of South America (WCSA), stretching from northern Peru to Ecuador. This study constructed a multiple linear regression (MLR) model to forecast precipitation anomalies with high spatial resolution across …

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Setting the Standard: Recommended Practices for Data Preprocessing in Data-Driven Climate Prediction

Jason C. Furtado, María J. Molina, Weston Anderson, Tom Beucler et autres

Artificial intelligence (AI) - and specifically machine learning (ML) - applications for climate prediction across timescales are proliferating quickly. The emergence of these methods prompts a revisit to the impact of data preprocessing, a topic familiar to the climate community, as more …

Embedded Microstrip Antenna for 150 GHz Band Antenna-in-Package with Suppression of Mutual Coupling Radiating Towards Substrate Edge

Ryosuke Hasaba, Ken I. Takahashi, Tomoki Abe, Tomohiro Murata et autres

A microstrip antenna radiating towards the substrate edge is proposed for 150 GHz band Antenna-in-Package applications, designed to suppress mutual coupling between antenna elements. By incorporating side ground walls made of vias and copper foil around the radiating elements, the symmetry of …

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Extreme Droughts in the Peruvian Amazon Region (2000–2024)

Daniel Martínez-Castro, Ken I. Takahashi, Jhan Carlo Espinoza, Alejandro Vichot‐Llano et autres

Droughts in the Amazon region are expected to increase in frequency and intensity, which would negatively affect the tropical forest, leading to a positive climate–forest feedback loop that could potentially result in the collapse of this ecosystem. In this study, extreme drought …

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A 150 GHz High-Power-Density Phased-Array Transceiver in 65nm CMOS for 6G UE Module

Yudai Yamazaki, Sunghwan Park, Chenxin Liu, Jun Sakamaki et autres

This paper proposes a high-power-density 150 GHz phased-array transceiver designed for 6G user equipment (UE) modules, utilizing$65-\text{nm}$CMOS technology. An 8 -element AiP module using two transceiver ICs operates in the 142-164 GHz frequency range, achieving an EIRP of 26 dBm and a …

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Multi-time scale analysis of the water level minima in Lake Titicaca over the past 103 years

Juan Sulca, Mathias Vuille, Ken I. Takahashi, Paul E. Roundy et autres

Lowest events in Lake Titicaca’s water level (LTWL) significantly impact local ecosystems and the drinking water supply in Peru and Bolivia. However, the hydroclimatic mechanisms driving extreme lake-level lowstands remain poorly understood. To investigate these low lake-level events, we analyzed detrended monthly …

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Extreme Droughts in the Peruvian Amazon Region (2000-2024)

Daniel Martínez-Castro, Ken I. Takahashi, Jhan Carlo Espinoza, Alejandro Vichot‐Llano et autres

Droughts in the Amazon region are expected to increase in frequency and intensity, which would negatively affect the tropical forest, leading to a positive climate-forest feedback loop that could potentially result in the collapse of this ecosystem. In this study, extreme drought …

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Dual-Polarized Microstrip Antenna with Cross Grid Structure Radiating Towards the Edge of the Substrate in the D-Band

Ryosuke Hasaba, Ken I. Takahashi, Tomoki Abe, Tomohiro Murata et autres

This paper proposes a dual-polarized antenna for D-band applications, which radiates in the substrate end direction. The antenna's radiating elements and ground are formed using vias, via lands, and copper foil. The radiating element features a cross-grid design, which combines both cross …

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