180701 用 Python 來玩粒子物理實驗吧：An Example of Using Deep Learning to Correct Energy Measurement in the Belle II Experiment

Title:
用 Python 來玩粒子物理實驗吧：An Example of Using Deep Learning to Correct Energy Measurement in the Belle II Experiment

Speaker:
黃坤賢 (Kunxian Huang)

Time:

*注意：本週演講時間調整至週日 (US) / 週一 (TW)

07/01 (Sun.) 7 pm PDT, 8 pm MDT, 9 pm CDT, 10 pm EDT
07/02 (Mon.) 10 am Taiwan

Keywords:
物理, 實驗高能物理, Physics, Experimental high energy physics, Belle II, CsI crystal, Convolutional Neural Network

Abstract:

粒子物理實驗是一門探求物質最小組成法則和相互作用的科學，隨著時代的演進，現在的粒子物理實驗必須要面對數以千萬計大量的資料和自動化儀器的需求。近十幾年來，在傳統的數據分析，到機器學習的數據分析，到儀器監控介面等方面採用 Python 語言的物理學家們越來越多，也對 Python 社群做出許多的貢獻。

位於日本筑波市的 Belle II 實驗即將於今年春天開始啟動運轉，目的是尋找反物質與物質不對稱之謎，更是第一個全採用 Python 來作為主要開發及分析的大型粒子物理實驗。 本次分享 Belle II 實驗中使用 Python 進行數據分析的現況，並用一個使用深度學習 CNN 方法來校正伽瑪射線能量量測之實例，來展示在粒子物理的資料分析中使用 TensorFlow in Python API 之過程。

180623 The air we breathe. The water we drink.

Title:
The air we breathe. The water we drink.

Speaker:
余哲瑨 (Che-Chin "Joseph" Yu)

Time:
06/23 (Sat.) 6 pm PDT, 7 pm MDT, 8 pm CDT, 9 pm EDT
06/24 (Sun.) 9 am Taiwan

Keywords:
Chemical engineering, Catalysis photocatalysis, Electrochemistry, Environmental remediation, Air, Water

Abstract:
Recently, serious air pollution, such as PM2.5 and smog, has raised public awareness of air quality. NOx (NO+NO2) is one of the most detrimental pollutants, both to the environment and human beings, because it not only possesses toxicity but also contributes to the aforementioned problems. This talk begins with a introduction of the NOx (pollutant) abatement technique to coal-burning flue gas in our state-of-art pilot-scale photoreactor, followed by the modification of photocatalysts, with the intention of improving photocatalytic efficiency using titania nanosheet (TiO2 nanosheet) photocatalysts. Finally, this talk will end up in a additional study of electrochemical wastewater treatment using carbon-based electrodes with Fenton and ozonation reaction. Ultimately, these findings promise to provide better air and water quality and even greater quality of life for future generation.

180617 Medium-Range Cloud-Resolving Typhoon Rainfall Ensemble Forecasts for Taiwan through Time-Lagged Approach

Title:
Medium-Range Cloud-Resolving Typhoon Rainfall Ensemble Forecasts for Taiwan through Time-Lagged Approach

Speaker:
陳鑫澔 (Shin-Hau Chen)

Time:

*注意：本週演講往後調整到週日 (US) / 週一 (TW)

06/17 (Sun.) 6 pm PDT, 7 pm MDT, 8 pm CDT, 9 pm EDT
06/18 (Mon.) 9 am Taiwan

Keywords:
Atmospheric science, Typhoon forecast, Precipitation forecast, Typhoon, Quantitative precipitation forecast, Cloud-resolving model

Abstract:

For typhoon hazard reduction in Taiwan, realistic rainfall scenarios associated with different tracks are the most demanded information by the authorities, and can be best provided only by cloud-resolving models (CRMs). However, at high computational expense, such models are deterministic and generally regarded as having inadequate lead time and no probability information to quantify forecast uncertainty, compared to a multi-member ensemble. Thus, this study designs a new forecast strategy to solve the two major drawbacks of CRMs through a time-lagged approach. The ensemble system using the Cloud-Resolving Storm Simulator (CReSS) has a grid size of 2.5 km, a large domain of 1860 x 1360 km2, and an extended range of 8 days, and combines the strengths of high resolution for quantitative precipitation forecast (QPF) and longer lead time for preparation in an innovative way. Its performance is evaluated for six typhoons in 2012-2013.

For the six typhoons, in addition to at short ranges within 3 days, the system produced a high-quality QPF at a longest range up to day 8, 4, 6, 3, 6, and day 7 beforehand, respectively, providing much extended lead time, especially for slow-moving ones that pose higher threats to Taiwan. Moreover, demonstrated in the highlight case of Kong-Rey (2013), since forecast uncertainty (reflected in spread) reduces with lead time, this system can provide a wide range of rainfall scenarios in Taiwan early on at longer lead time (beyond 4-5 days), each highly realistic for its track, for early warning and advanced preparation for the worst case. Then, as the typhoon approaches and the predicted tracks converge at short range, the authority can make adjustments toward the scenario with increasing likelihood. This strategy fits well our conventional wisdom to “hope for the best, but prepare for the worst” when facing natural hazards like typhoons.

Requiring only about 1500 cores to execute four 8-day runs per day, our system compares much favorably in usefulness to a typical 24-member ensemble (5-km grid size, 750 x 900 km2, 3-day forecasts) currently in operation at comparable computational expenses. Thus, it is not only powerful, but also already affordable and feasible.

180603 Miniaturization and Integration of MEMS Vibratory Inertial Sensors

Title:
Miniaturization and Integration of MEMS Vibratory Inertial Sensors

Speaker:
林昱維 (Yu-Wei Lin)

Time:
06/03 (Sun.) 6 pm PDT, 7 pm MDT, 8 pm CDT, 9 pm EDT
06/04 (Mon.) 9 am Taiwan

Keywords:
Mechanical engineering, Micro-electro-mechanical Systems (MEMS), Transducers, Inertial measurement unit, Inertial sensors

  仍與講者商討細節中，本次演講錄影暫緩上傳

Abstract:
There have been increased adaptations of MEMS inertial sensors in the consumer electronics and bio-medical fields for applications such as drones, wearable electronics, and motion tracking devices. In this presentation I will briefly introduce navigation solutions based on inertial measurement unit and basics of accelerometers and gyroscopes. Recent research focus that will be discussed/touch base on include: features in sensor design (mechanical levers and mode ordering), gyroscope control loops, sensors integration through 3D folded MEMS structure, personal navigation algorithm (ZUPT), fabrication process, and sensor packaging.

180609 Examining Transfer Credit Mobility and Baccalaureate Degree Attainment

Title:
Examining Transfer Credit Mobility and Baccalaureate Degree Attainment

Speaker:
許薰儷 (Shelly Hsu)

Time:
06/09 (Sat.) 5 pm PDT, 6 pm MDT, 7 pm CDT, 8 pm EDT
06/10 (Sun.) 8 am Taiwan

Keywords:
Education, Higher education, Transfer students, Articulation agreement, Educational policy

Abstract:
The purposes of this study are to investigate (a) the effectiveness of curriculum alignment based on Transfer Model Curricula articulation agreements among various majors and community colleges, and (b) the influence of articulation agreements on baccalaureate degree attainment for community college students.