확률모형과 머신러닝을 잇는 연구.

GAPS: Gradient-Aware Adaptation-Gap Scoring for Time-Series Anomaly Detection with Foundation Models

Kim, J.¹; Song, B.; Ko, Y. M.^*

파운데이션 모델을 활용한 시계열 이상 탐지를 위한 Gradient-Aware Adaptation-Gap Scoring 연구입니다.

The Fortieth Annual Conference on Neural Information Processing Systems (NeurIPS), 2026

Patch-based Memory Gate Model in Time Series Foundation Model

Yoon, S.¹; Kim, J.; Ha, J.; Ko, Y. M.^*

정상 패턴을 기억하는 패치 단위 메모리를 시계열 파운데이션 모델에 결합하여 이상 탐지를 연구합니다.

Transactions on Machine Learning Research · 2026

Online temperature monitoring system for semiconductor automated test equipment using local Gaussian process

Kim, J.¹; Baik, S. M.; Yu, D.; Kim, J.; Ko, Y. M.^*

국소 가우시안 프로세스를 이용하여 반도체 자동 검사 장비의 온도를 모니터링합니다.

39(2), 256–265

Overcoming the curse of dimension of the optimal group maintenance policy of a heterogeneous multi-component series system

Barde, S.¹; Ko, Y. M.; Shin, H.^*

48, 355–384

Queueing Management for Reducing the Overlaps of Customers in Service Systems

Xu, J.¹; Ko, Y. M.^*; Kong, M.; Pender, J.

서비스 시스템에서 고객 간 체류시간 중첩을 분석하고 이를 줄이는 운영 방안을 연구합니다.

48, 325–354

Managing Queueing Systems with Gathering-Averse Customers: Staffing, Pooling, and Opening Hours

Xu, J.¹; Huang, D.; Ko, Y. M.^*; Pender, J.

110(22), 1–64

Monotonic Variational Gaussian Process for Efficient Data Collection

Lee, D.¹; Ko, Y. M.^*

단조성에 관한 지식을 가우시안 프로세스에 반영하여 효율적인 데이터 수집을 다룹니다.

ICML 2026

Complexity- and Statistics-Guided Anomaly Detection in Time Series Foundation Models

Kim, J.¹; Yoon, S.; Ko, Y. M.^*; Kim, Y.; Kim, S. I.; Tae, J.

데이터 복잡도와 통계적 특성을 활용해 시계열 파운데이션 모델의 이상 탐지 문제에 접근합니다.

ICLR 2026

Compressing the Markov Chain State Space for Circular k-out-of-n: G Balanced Systems under Sequential External Shocks

Ju, J.¹; Ko, Y. M.; Cho, Y.^*

26(1), 1–9

Optimizing White Noise for Stability and Strategic Performance Enhancement of LLM-RAG Systems

Kim, D.¹; Ko, Y. M.^*

52(3), 193–207 · Written in English

Toward Robust Anomaly Detection with Time-Series Foundation Models: Improving Anomaly Separability through Provable Mean Separation and Variance Reduction

Kim, J.

Ph.D. thesis

Meta-Path-Based Graph-Level Representation Learning for Heterogeneous Graph Classification

Shin, J.

M.S. thesis

Strategic Utilization of White Noise to Enhance the Stability and Performance of LLM-RAG Systems

Kim, D.

M.S. thesis

LLM and KG based App Recommendation in New Environment and an App Log Simulator for User Data Free

Moon, C. Y.

M.S. thesis

Overlap approximation schemes in time-varying many-server queues

Ko, Y. M.¹; Xu, J.^*

Online published

Analysis on non-monotone control-limit condition-based maintenance policies

Barde, S.¹; Ko, Y. M.^*

74(4), 5765–5779

Learning-driven berth allocation optimization with port authority behavior

Lee, D.¹; Ko, Y. M.^*

13, 173832–173843

The Number of Overlapping Customers in Erlang-A Queues: An Asymptotic Approach

Pender, J.^1,*; Ko, Y. M.; Xu, J.

유체·확산 근사를 활용하여 Erlang-A 대기시스템의 고객 중첩 수를 분석합니다.

39(3), 344–369

The benefits of a dual-lane zone picking system with buffer-free conveyor lanes: An analytical approach

Tran-Vo, T. H.¹; Ko, Y. M.; Hong, S.^*

207, 111278

Strata Design for Variance Reduction in Stochastic Simulation

Park, J.¹; Byon, E.^*; Ko, Y. M.; Shashaani, S.

67(5), 203–214

Using statistical models for optimal packaging in semiconductor manufacturing processes

Kim, D.¹; Kim, H.; Kim, Y.; Chae, M.^*; Ko, Y. M.; Bae, Y.-M.; Sim, H.; Oh, Y. C.; Noh, K. H.

54, 1–19

Time Series Dataset Representation for Foundation Model by Using Graph

Park, J. H.

M.S. thesis

Timeseries anomaly detection with foundation model

Kim, J.¹; Ko, Y. M.^*

Working-paper record · 2025

Constrained Density-Based Spatial Clustering of Applications with Noise (DBSCAN) using Hyperparameter Optimization

Kim, J.¹; Lee, H.; Ko, Y. M.^*

303, 112436

Condition-based Selective Maintenance Optimization for Large-scale Systems Consisting of Many Homogeneous Units

Lee, E.¹; Ju, J.; Byon, E.; Ko, Y. M.^*

73(2), 1393–1406

Customer Journey Prediction with Context-based Penalty under Imbalanced and Unlabeled Data

Park, E.

M.S. thesis

Robust Portfolio Optimization using Sentiment-based Uncertainty Sets

Nguyen, P. T. H.

M.S. thesis

Robust Input Sampling Strategies for Stochastic Simulations with Uncertain Input Model

Baik, S. M.

Ph.D. thesis

QoS-aware energy-efficient workload routing and server speed control policy in data centers: a robust queueing theoretic approach

Baik, S. M.¹; Ko, Y. M.^*

55(12), 1242–1255

Reliability Improvement of Circular k-out-of-n: G Balanced Systems through Center of Gravity

Cho, Y.¹; Baik, S. M.; Ko, Y. M.^*

11, 91407–91422

Probabilistic Modeling of Fish Growth in Smart Aquaculture Systems

Kim, J.¹; Park, E.; Cho, S.; Kwon, K.; Ko, Y. M.^*

17(8), 2259–2277

Robust Importance Sampling for Stochastic Simulations with Uncertain Parametric Input Model

Baik, S. M.¹; Ko, Y. M.^*; Byon, E.

397–408

TGC-based Fish Growth Estimation Model using Gaussian Process Regression Approach

Sung, J.¹; Cho, S.; Jung, D.-E.; Kim, J.; Park, J.; Kwon, K.^*; Ko, Y. M.^*

24(1), 61–69 · Written in Korean

Short-term electric load forecasting via state-space approach with a mixture of long-lag vector autoregressive models

Jeong, D.¹; Park, C.; Ko, Y. M.^*

Working-paper record · 2023

Distributionally Robust Stratified Sampling for Stochastic Simulations With Multiple Uncertain Input Models

Baik, S. M.¹; Byon, E.; Ko, Y. M.^*

Working-paper record · 2023

General EM Algorithm for Fitting Non-Monotone Hazard Functions from Truncated and Censored Observations

Barde, S.¹; Ko, Y. M.; Shin, H.^*

50(5), 476–483

Optimal budget allocation for stochastic simulation with importance sampling: exploration vs. replication

Ko, Y. M.¹; Byon, E.^*

54(9), 881–893

Power- and QoS-Aware Job Assignment with Dynamic Speed Scaling for Cloud Data Center Computing

Cho, Y.¹; Ko, Y. M.^*

10, 38284–38298

Collection and Analysis of Electricity Consumption Data in POSTECH Campus

Ryu, D.-H.¹; Kim, K.-J.^*; Ko, Y. M.; Kim, Y.-J.; Song, M.

50(3), 617–634 · Written in Korean

Nonparametric Importance Sampling for Wind Turbine Reliability Analysis with Stochastic Computer Models

Li, S.¹; Ko, Y. M.; Byon, E.^*

15(4), 1850–1871

Missing Data Imputation using Mixture Factor Analysis for Building Electric Load Data

Jeong, D.¹; Park, C.; Ko, Y. M.^*

304, 117655

Uncertainty Quantification for Extreme Quantile Estimation with Stochastic Computer Models

Pan, Q.¹; Ko, Y. M.; Byon, E.^*

70(1), 134–145

Short-term electric load forecasting for buildings using logistic mixture vector autoregressive model with curve registration

Jeong, D.¹; Park, C.; Ko, Y. M.^*

282, 116249

Missing Value Imputation and Forecasting Algorithms for Electric Load Data with Multi-cluster and Mixture Time Series Models

Jeong, D.

Ph.D. thesis

Economic Design and Maintenance of a Circular k-out-of-n: G Balanced System with Load-Sharing Units

Endharta, A. J.¹; Ko, Y. M.^*

69(4), 1465–1479

Utilizing Electricity Consumption Data to Assess the Noise Discomfort Caused by Electrical Appliances between Neighbors: A Case Study of a Campus Apartment Building

Ryu, D.-H.¹; Kim, R.-H.; Choi, S.-H.; Kim, K.-J.^*; Ko, Y. M.; Kim, Y.-J.; Song, M.; Choi, D. G.

12(20), 8704

Adaptive Importance Sampling for Extreme Quantile Estimation with Stochastic Black Box Computer Models

Pan, Q.¹; Byon, E.^*; Ko, Y. M.; Lam, H.

67(7), 524–547

Fitting Discrete Phase-type Distribution from Censored and Truncated Observations with Pre-specified Hazard Sequence

Barde, S.¹; Ko, Y. M.; Shin, H.^*

48(3), 233–239

Stabilizing the virtual response time in single-server processor sharing queues with slowly time-varying arrival rates

Cho, Y.¹; Ko, Y. M.^*

293, 27–55

Building Evacuation Planning Algorithms considering Network Congestion and Human Behavior

Oh, C. H.

Ph.D. thesis

An Efficient Building Evacuation Algorithm in Congested Networks

Oh, C. H.¹; Kim, M. H.; Kim, B.-I.; Ko, Y. M.^*

7(1), 169480–169494

Resource Management in Data Centers for Energy-Efficiency, Time-Stable Performance, and Quality-of-Service

Cho, Y.

Ph.D. thesis

Charging Scheduling Problem of an M-to-N Electric Vehicle Charger

Ki, Y.¹; Kim, B.-I.^*; Ko, Y. M.; Jeong, H.; Koo, J.

64, 603–614

Reliability Evaluation of Circular k-out-of-n: G Balanced Systems through Minimal Path Sets

Endharta, A. J.¹; Yun, W. Y.; Ko, Y. M.^*

180, 226–236

The application rate for urology specialty compared with other specialties from 2007 to 2014 in Korea: is it influenced by social interest manifested by internet trends?

Sun, H. Y.¹; Ko, Y. M.; Lee, S. W.; Lee, B.^*; Kim, J. H.^*

18, 65

Strong approximations for time-varying infinite-server queues with non-renewal arrival and service processes

Ko, Y. M.¹; Pender, J.^*

34(2), 186–206

Energy Efficiency of Data Center Operating Practices: Server Clustering, Powering On/Off, and Bang-Bang Control

Cho, Y.¹; Ko, Y. M.^*

71(2), 107–119

Condition-based Selective Maintenance Optimization for a Large-scale Non-Markovian System

Lee, E.

M.S. thesis

Approximations for the Queue Length Distributions of Time-Varying Many-Server Queues

Pender, J.¹; Ko, Y. M.^*

29(4), 688–704

Does uneven geographic distribution of urologists affect bladder and prostate cancers mortality? National health insurance data in Korea from 2007 to 2011

Kim, J. H.^1,*; Sun, H. Y.; Kim, H. J.; Ko, Y. M.; Chun, D.-I.; Park, J. Y.^*

8(39), 65292–65301

Efficacy and Safety of Initial Combination Treatment of an Alpha Blocker with an Anticholinergic Medication in Benign Prostatic Hyperplasia Patients with Lower Urinary Tract Symptoms: Updated Meta-Analysis

Kim, H. J.¹; Sun, H. Y.; Choi, H.; Park, J. Y.; Bae, J. H.; Doo, S. H.; Yang, W. J.; Song, Y. S.; Ko, Y. M.; Kim, J. H.^*

12(1), e0169248

Efficacy and safety of prostatic arterial embolization: Systematic review with meta-analysis and meta-regression

Shim, S. R.¹; Kanhai, K.; Ko, Y. M.; Kim, J. H.^*

197(2), 465–479

Diffusion Limits for the (MAPt/PHt/∞)N Queueing Network

Ko, Y. M.¹; Pender, J.^*

45(3), 248–253

Condition-based joint maintenance optimization for a large-scale system with homogeneous units

Ko, Y. M.¹; Byon, E.^*

49(5), 493–504

A Markov Chain Analysis of State Transitions of Chronic Diseases using Medical Checkup Data

Jung, I.

M.S. thesis

A Markov Chain Analysis for State Transitions of Hypertension Using Medical Checkup Data

Jung, I.¹; Kim, J. H.; Kang, S.-H.; Ko, Y. M.^*

Working-paper record · 2017

Development of National e-Health Strategy

Shin, J.-E.¹; Cho, D.; Kim, B.^*; Ko, Y. M.; Ki, Y.; Jung, I.; Kang, S.-H.; Park, J.; Kwak, M.; Hwang, H.

42(3), 198–208 · Written in Korean

Geographic Distribution of Urologists in Korea, 2007 to 2012

Song, Y. S.¹; Shim, S. R.; Jung, I.; Sun, H. Y.; Song, S. H.; Kwon, S. S.; Ko, Y. M.; Kim, J. H.^*

30(11), 1638–1645

Bladder recovery by stem cell based cell therapy in the bladder dysfunction induced by spinal cord injury: Systematic review and meta-analysis

Kim, J. H.¹; Shim, S. R.; Doo, S. W.; Yang, W. J.; Yoo, B. W.; Kim, J. M.; Ko, Y. M.; Song, E. S.; Lim, I. S.; Lee, H. J.^*; Song, Y. S.^*

10(3), e0113491

A simple analysis of the transient period in peer-to-peer networks

Ko, Y. M.^1,*

19(9), 1528–1531

Reliability evaluation of large-scale systems with identical units

Ko, Y. M.¹; Byon, E.^*

64(1), 420–434

Validation and Reliability of a Smartphone Application for the International Prostate Symptom Score Questionnaire: A Randomized Repeated Measures Crossover Study

Kim, J. H.¹; Kwon, S.-S.; Shim, S. R.; Sun, H. Y.; Ko, Y. M.; Chun, D.-I.; Yang, W. J.; Song, Y. S.^*

16(2), e38

A distributed speed scaling and load balancing algorithm for energy efficient data centers

Ko, Y. M.^1,*; Cho, Y.

79, 120–133

Integrating virtualization, voltage scaling and powering on/off servers in data centers for energy efficiency

Gallego, J.¹; Ko, Y. M.; Polansky, R.; Perez, E.; Ntaimo, L.; Gautam, N.^*

45(10), 1114–1136

Critically loaded time-varying multiserver queues: computational challenges and approximations

Ko, Y. M.¹; Gautam, N.^*

25(2), 285–301

Transient analysis of queues for peer-based multimedia content delivery

Ko, Y. M.¹; Gautam, N.^*

42(12), 881–896

Epidemic-based information dissemination in wireless mobile sensor networks

Ko, Y. M.¹; Gautam, N.^*

18(6), 1738–1751

Optimal Policies for Control of Peers in Online Multimedia Services

Ko, Y. M.¹; Chamberland, J.-F.; Gautam, N.

3800–3805