About

Byungwook Kim is an Assistant Professor of Finance at the Paul Merage School of Business at the University of California Irvine. His research interests include asset pricing, investor behavior, asset management (including ETFs, mutual funds, hedge funds, and private equity), and fintech. His work has been published in leading academic journals such as the Review of Financial Studies and has been featured in media outlets including Bloomberg, The Economist, Financial Times, Reuters, and The Wall Street Journal. He has presented his research at top economics and finance conferences, including meetings of the American Economic Association, the National Bureau of Economic Research, the Society for Financial Studies Cavalcade, and the Western Finance Association, as well as conferences hosted by central banks like the Federal Reserve Board and the Bank of Canada. He holds a Ph.D. in Finance from Ohio State University, an M.S. in Statistics from the University of Chicago, and a B.B.A. from Yonsei University.

Research topics

• Chemical physics
• Optics
• Molecular physics
• Materials science
• Chemistry
• Physics
• Nanotechnology
• Biochemistry
• Composite material
• Biology
• Horticulture
• Food science
• Atomic physics
• Botany
• Optoelectronics
• Computational chemistry

Selected publications

• Ethyl formate diluted with nitrogen is an effective biosecurity treatment for brown marmorated stink bug ( <scp> <i>Halyomorpha halys</i> </scp> )

  Pest Management Science · 2025-12-15

  articleOpen access

  Abstract BACKGROUND The brown marmorated stink bug ( Halyomorpha halys ) (BSMB) is a biosecurity threat globally. Its most likely avenue of entry is via shipping transport of a multitude of commodities. Currently employed biosecurity treatments (methyl bromide, sulfuryl fluoride) pose several concerns including climate change, environmental and occupational health and safety. Ethyl formate with dilution in carbon dioxide has been shown to be an effective biosecurity treatment for controlling BMSB. Carbon dioxide is a known synergist in fumigation and is a greenhouse gas contributing to climate change. RESULTS Laboratory and commercial‐scale bioassays were conducted to evaluate the efficacy of ethyl formate in controlling diapausing and non‐diapausing BMSB. In both trials and all treatment conditions, ethyl formate concentrations &gt;12 mg L −1 without dilution in carbon dioxide for 3‐h exposure periods were effective in achieving insect control. These results were consistent with existing literature and showed the rapid action of the fumigant in achieving a desirable level of insect mortality. The results demonstrate that even without the synergist carbon dioxide, ethyl formate can achieve complete mortality of both non‐diapausing and diapausing BSMBs at a dose rate lower than the currently registered 90 mg L −1 . CONCLUSION The results of this research show the commercial viability of ethyl formate, without dilution with carbon dioxide, as a biosecurity treatment for the control of BMSB, both non‐diapausing and diapausing. These results will also assist in progressing the registration of the fumigant with relevant National Plant Protection Organisations. © 2025 The Author(s). Pest Management Science published by John Wiley &amp; Sons Ltd on behalf of Society of Chemical Industry.

  PublisherOA PDFDOI

• Performance Evaluation of ChatGPT-4o on Korean Physical Therapist Licensing Examination

  Physical therapy rehabilitation science · 2025-06-30

  articleOpen access1st authorCorresponding

  Objective:The objective of this study was to evaluate the performance of ChatGPT-4o on the Korean Physical Therapist Licensing Examination(KPTLE) and to explore its potential as a supplementary tool in physical therapy education and assessment.Design: Quantitative experimental study using publicly available national examination data.Methods: ChatGPT-4o was tested on 960 multiple-choice questions from the 47th to 51st KPTLE, withoutany provision of source or domain-specific information.Correct answer rates and pass/fail status were assessed.Additionally, its performance was compared with that of examinees who passed the same examinations.Statistical analyses included one-sample t-tests, effect size calculationsusing Cohen's d. and percentile rankings.Results: ChatGPT-4o achieved an average correct answer rate of 88.9%, consistently exceeding the passing criteria across all years.Compared to students who passed the same examinations, ChatGPT-4o performed significantly better in overall and subject-specific scores (p 0.001), with large effect sizes (Cohen's d 0.8) and top percentile rankings.Although its performance in the medical law section was relatively poor, the overall results indicated stable and strong performance.Conclusions: ChatGPT-4o demonstrated sufficient domain knowledge to pass the written KPTLE often surpassing human examinee performance in standardized multiple-choice formats.These findings suggest the potential for its use in theoretical education and physical therapy assessments.Additional, further research is required to assess its applicability in testing practical skills and real-world clinical environments, particularly given the limitations inherent in current language models.

  PublisherOA PDFDOI

• Metabolomic and partial proteomic analyses of phosphine resistance in Sitophilus oryzae adults: Significant reduction in body weight after acquiring resistance

  Pesticide Biochemistry and Physiology · 2025-07-08

  article
  PublisherDOI

• Transcriptomic insights into detoxification and mitochondrial responses of Tribolium castaneum (Coleoptera: Tenebrionidae) to carbonyl sulfide exposure

  Journal of Stored Products Research · 2025-03-09 · 2 citations

  article
  PublisherDOI

• Enhancing Passage Selection and Answer Generation in FiD Systems Using Relevance Gating

  Journal of KIISE · 2025-05-25

  articleSenior author

  본 논문에서는 오픈 도메인 질의응답 시스템에서 FiD(Fusion-in-Decoder) 모델의 성능을 향상시키기 위한 새로운 접근 방식을 제안한다. FiD 모델은 여러 패시지를 독립적으로 인코딩한 후, 디코딩 단계에서 이를 결합하여 답변을 생성하는 구조를 갖고 있다. 그러나 이 방식은 불필요한 정보를 포함한 패시지를 필터링하지 못해 디코더에 과도한 부담을 주는 단점이 있다. 이를 해결하기 위해, 본 논문에서는 LSTM(Long Short-Term Memory)의 망각 게이트를 응용한 관련성 게이트(Relevance Gate)를 도입하였다. 이 게이트는 각 패시지의 관련성을 병렬적으로 평가하여 디코더에 전달되는 정보를 선별하며, 이를 통해 답변 생성의 정확성과 효율성을 크게 향상시킨다. 또한, 시그모이드 함수 대신 오픈 도메인 질의응답시스템에 적합한 새로운 활성 함수를 적용하여 모델의 안정성을 확보하였다.

  PublisherDOI

• Contract for Work in Korean Civil Act and Occupational Health and Safety Act

  kangwon Law Review · 2024-02-29

  article1st authorCorresponding

  도급계약은 수급인이 업무를 수행하고, 그에 대한 보수를 받는다는 점에서 다른 노무공급계약인 고용 · 위임과 유사하다. 그러나 도급과 고용 · 위임과의 중요한 차이는 수급인의 급부의무는 노무제공 그 자체에 있지 않고, 노무제공으로 인한 일의 완성이라는 결과라는 점에 있다. 따라서 이들 계약 간의 구별은 계약의 해석, 즉 계약당사자들이 계약을 통해서 정한 급부의 대상이 노무제공 그 자체인지, 아니면 노무제공으로 인한 결과에 대한 것인지에 따라 결정된다. 그리고 계약의 명칭이나 형식보다는 계약관계의 실질을 반영하는 계약체결의 경위와 목적, 당사자의 지위, 위험부담 등을 비롯한 여러 요소들 가지고 종합적인 판단을 해야 한다. 이러한 구별을 통해서 당해 계약관계에 적용할 수 있는 민법규정을 확정함으로써 당사자의 권리와 의무와 법률효과를 결정할 수 있다. 이와 달리 도급과 노동법상 근로계약의 구별은 노동법상 수규자를 규명하는 문제로서 민법상 도급의 형식을 취하고 있지만 그 실질에 있어서는 근로계약에 해당하는 위장도급을 가려내어 도급인에게 노동법적 지위와 책임을 인정하는 데 그 목적이 있다. 도급과 근로계약 간의 구별의 핵심적인 기준은 근로지시권의 존재여부인데, 도급인의 지시가 급부와 결과관련성이 없이 이루어진 지시는 근로지시권에 해당하고, 이때 당사자 간에 근로계약관계가 인정된다.<br/> 2020년 개정 산안법은 도급, 도급인, 수급인, 관계수급인, 건설공사발주자의 개념을 정의하면서 도급인의 책임을 확대 · 강화하였다. 도급(인)의 개념과 관련해서 개정 산안법은 계약의 명칭과 상관없이 자신의 업무를 타인에게 맡기는 것을 도급으로 정의하고 있는데(제2조 제6호), 이러한 개정 산안법상 도급의 개념은 고용 · 도급 · 위임은 물론이고 업무위탁, 업무대행 등을 포괄하는 ‘도급 등’으로 이해될 수 있다. 그리고 산안법상 도급인의 책임은 도급인이 도급을 통해 수급인의 근로자들과의 업무수행공동체를 구성하였고, 산업재해의 방지를 할 수 있는 지위에 있을 뿐만 아니라 사업수행에 따른 이윤을 얻는 것에 상응하여 그에 다른 책임을 부담해야 한다는 점에서 인정되는 것이다. 개정 산안법은 도급인의 책임판단기준에 대해서 명시적으로 정하지 않았지만, 그 기준은 도급인에게 근로자의 안전과 보건에 위해가 되는 위험(원)에 대한 지배 내지 관리의 가능성의 관점에서 결정되어야 한다. 이러한 업무 내지 사업의 수행에 따른 위험에 대한 지배 · 관리가능성은 장소적 위험관련성, 물적(시설적) 위험관련성, 업무적 위험관련성으로 구분할 수 있다. 끝으로 개정 산안법에서는 건설공사의 발주자를 도급인과 달리 규율하고 있는데, 이러한 규율은 건설공사의 시공을 주도하여 총괄 · 관리하지 아니하는 건설공사발주자의 경우 재해에 대한 위험(원)에 대한 지배 · 관리가능성이 낮다는 통상적인 건설도급관계를 고려한 것이다.

  PublisherDOI

• Prompt Tuning For Korean Aspect-Based Sentiment Analysis

  Journal of KIISE · 2024-12-31

  article1st authorCorresponding

  속성기반 감정분석은 텍스트 내에서 감정과 해당 감정이 특정 속성, 예를 들어 제품의 특성이나 서비스의 특징에 어떻게 연결되는지를 분석하는 태스크이다. 본 논문에서는 속성기반 감정분석 데이터를 사용한 다중 작업-토큰 레이블링 문제에 프롬프트 튜닝 기법을 적용하기 위한 포괄적인 방법론을 소개한다. 이러한 방법론에는 토큰 레이블링 문제를 시퀀스 레이블링 문제로 일반화하기 위한 감정표현 영역 검출 파이프라인이 포함된다. 또한 분리된 시퀀스들을 속성과 감정에 대해 분류하기 위한 템플릿을 선정하고, 데이터셋 특성에 맞는 레이블 워드를 확장하는 방법을 제안함으써 모델의 성능을 최적화한다. 최종적으로, 퓨샷 세팅에서의 속성기반 감정분석 태스크에 대한 몇 가지 실험 결과와 분석을 제공한다. 구축된 데이터와 베이스라인 모델은 AIHUB(www.aihub.or.kr, 속성기반 감정분석 데이터)에 공개되어 있다.

  PublisherDOI

• A 99.93% Peak Current Efficiency Digital-LDO using Single VCO With Dual Frequency Gain Control

  JSTS Journal of Semiconductor Technology and Science · 2024-12-31

  article

  The proposed digital low-dropout voltage regulator (DLDO) automatically controls clock frequency based on the difference between the reference and feedback voltage. Enabling adaptive frequency regulation during voltage ringing events, and thus assisting rapid transient response. Unlike prior approaches utilizing two voltage-controlled oscillators (VCOs) to generate frequencies for controlling pass gates, this work employs a single VCO, reducing the need for VCO control voltage pins. The proposed DLDO regulates the output at 1 V from a 1.2 V supply and has been implemented based on a 65 nm CMOS process. The transient time is 782 ns, a power efficiency of 99.93%, and the FOM is 15 fs.

  PublisherDOI

• A High Power Supply Rejection and Fast-transient LDO with Feed-forward Compensation using Current Sensing Technique

  JSTS Journal of Semiconductor Technology and Science · 2024-02-29

  article1st authorCorresponding

  This paper presents a high power supply rejection ratio (PSRR) and a method to achieve stability for low-dropout (LDO) regulators, an essential system-on-chip (SoC) component. The feedforward method improves the PSRR in the LDO regulator by adjusting the output voltage with a compensation signal which is proportional to the power supply noise. Also, the proposed current sensing is incorporated into the LDO regulator

  PublisherDOI

• Advances and challenges in dynamic photo-induced force microscopy

  Discover Nano · 2024-11-21 · 7 citations

  reviewOpen access

  Photo-induced force microscopy (PiFM) represents a scanning probe technique renowned for its ability to provide high-resolution spectroscopic imaging at the nanoscale. It capitalizes on the amplification of tip motion by photo-induced forces, which are influenced by the response of the local medium, spanning from induced dipole interactions to thermal expansion. The behaviors of these force responses exhibit complexity in connection with both far-field and near-field effects, depending on their spectroscopic origins. In this review, we aim to provide a comprehensive overview of prior research endeavors, shedding light on their technical intricacies. We provide the perspectives of photo-induced dipole force and photo-induced thermal force, while exploring the dynamic PiFM modes associated with each scenario. Our article targets individuals newly venturing into this field, offering a blend of theoretical foundations and practical demonstrations covering a range from fundamental principles to advanced topics.

  PublisherOA PDFDOI

Frequent coauthors

• Wonho Jhe

  Harvard University

  34 shared

• Sangmin An

  Helmut Schmidt University

  31 shared

• Colleen M. Cebulla

  The Ohio State University Wexner Medical Center

  21 shared

• Woo‐Jin Byun

  Electronics and Telecommunications Research Institute

  21 shared

• Manhee Lee

  20 shared

• Kwang‐Seon Kim

  Electronics and Telecommunications Research Institute

  20 shared

• Byung‐Ho Lee

  Kyungpook National University

  19 shared

• Soyoung Kwon

  19 shared

Awards & honors

• Finalist, Charles Brandes Prize (2023)
• Best Ph.D. Student Paper Award, The 34th NFA Annual Conferen…
• Rénée M. Stulz Scholar Development Award (2023)