스마트시티 에너지 감시를 위한 CIM(Common Information Model) 프로파일 설계

김영일,채창훈,김예리,이지훈,Youngil, Kim,Changhun, Chae,Yeri, Kim,Jihoon, Lee 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2

With the advent of high technologies such as the 4th Industrial Revolution and artificial intelligence and big data, efforts are being made to solve urban problems and improve the quality of life by applying new technologies in the smart city field. In addition, as carbon neutrality has emerged as an important issue due to global warming, smart city energy platform technologies such as urban energy management, efficiency improvement, and carbon reduction are in the spotlight. In order to effectively manage urban energy, energy resource information such as electricity, water, gas, hot water, heating, etc. must be collected from the management system of various energy utilities and managed on the central platform. The centrally integrated data is delivered to external city management systems that require city energy information through an energy platform. This study developed a CIM profile for smart city energy monitoring required to provide energy data to external systems. Electric data model were designed using the CIM class of IEC 61970, and water, gas, and heat data model were designed in compliance with the UML-based design ideas of IEC 61970.

미계측유역의 수문모형 매개변수 추정을 위한 하이브리드 지역화모형의 개발

김영일,서승범,김영오,Kim, Youngil,Seo, Seung Beom,Kim, Young-Oh 한국수자원학회 2018 한국수자원학회논문집 Vol.51 No.8

수문모형의 매개변수 추정에 필요한 유량 관측 자료의 수집은 시 공간적으로 제한이 있어 우리나라도 아직 상당수의 미계측유역이 존재하며, 이를 보완하고자 주변 유역의 정보를 활용하는 지역화 방법들이 연구되어 왔다. 그러나 지역적 특성이나 기후 조건에 따라 지역화 방법의 결과가 상이하여 어느 지역에 어떠한 지역화 방법이 가장 우수하다고 판단하기 어렵다. 본 연구에서는 보편적으로 사용되는 지역화 방법인 지역회귀모형의 설명변수에 공간근접모형으로 추정한 수문모형의 매개변수를 추가하여 회귀모형의 적합성을 향상시켰으며, 이를 하이브리드 지역화모형이라 정의하고 기존 방법들과 비교하였다. 계측유역으로는 관측 자료가 충분한 남한의 37개 유역을 선정하였고, 수문모형은 개념적 수문모형인 GR4J를 사용하였으며, 계측유역에 대한 수문모형의 매개변수 산정은 Shuffled complex evolution 알고리즘을 사용하였다. 유역 특성변수들 간 다중공선성을 고려하기 위해 Variation inflation factor를 사용하였고, Stepwise regression을 통해 회귀모형의 최적 설명변수를 선택하였다. 통계 값을 통해 모형의 적합성을 비교한 결과, 하이브리드 지역화모형에서 가장 작은 RMSE 값을 나타내었으며, 유역별 모의 값의 변동성이 줄어들어 결과의 불확실성 또한 낮아짐을 확인할 수 있었다. 따라서 하이브리드 모형이 미계측유역의 유출량 산정을 위한 하나의 대안이 될 수 있음을 확인하였다. There remain numerous ungauged watersheds in Korea owing to limited spatial and temporal streamflow data with which to estimate hydrological model parameters. To deal with this problem, various regionalization approaches have been proposed over the last several decades. However, the results of the regionalization models differ according to climatic conditions and regional physical characteristics, and the results of the regionalization models in previous studies are generally inconclusive. Thus, to improve the performance of the regionalization methods, this study attaches hydrological model parameters obtained using a spatial proximity model to the explanatory variables of a regional regression model and defines it as a hybrid regionalization model (hybrid model). The performance results of the hybrid model are compared with those of existing methods for 37 test watersheds in South Korea. The GR4J model parameters in the gauged watersheds are estimated using a shuffled complex evolution algorithm. The variation inflation factor is used to consider the multicollinearity of watershed characteristics, and then stepwise regression is performed to select the optimum explanatory variables for the regression model. Analysis of the results reveals that the highest modeling accuracy is achieved using the hybrid model on RMSE overall the test watersheds. Consequently, it can be concluded that the hybrid model can be used as an alternative approach for modeling ungauged watersheds.

빔포밍 및 DOA 기반의 마스킹을 이용한 2채널 잡음제거

김영일,정상배,Kim, Youngil,Jeong, Sangbae 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.1

In this paper, we propose a multi-channel speech enhancement algorithm using beamforming and direction-of-arrival (DOA)-based masking. The proposed algorithm enhances noisy speech basically by the linearly constrained minimum variance (LCMV) algorithm and then a mel-scale Wiener filter designed using DOA-based masking is applied to remove still remaining noises. To improve the performance, we optimize the learning rate of the adaptive filters in LCMV and the DOA threshold to detect target speech spectrum. As performance indices, the perceptual evaluation of speech quality (PESQ) score and output SNRs are measured. Experimantal results show that the proposed algorithm outperforms the conventional LCMV beamformer by 0.09 in PESQ score and 5.75 dB in output SNR, respectively. 본 논문에서는 빔포밍과 입사각분석 기반 마스킹을 이용한 다채널 음성개선 알고리즘이 제안된다. 제안된 알고리즘에서는 LCMV 빔포밍을 수행한 후에 입사각 분석을 이용한 멜-주파수 위너필터가 적용되어 잔존하는 잡음을 제거한다. 성능 향상을 위해서 빔포밍의 적응 필터 학습률과 목표 음성 스펙트럼 검출을 위한 입사각 임계치가 최적화된다. 성능 지수로서 PESQ와 출력 SNR이 측정되었으며 실험 결과 제안한 알고리즘이 종전의 최소분산 빔포밍 기법보다 PESQ 관점에서 0.09, 출력 SNR 관점에서 5.75 dB의 성능 향상시킴을 알 수 있었다.

비선형모형에 적용한 제약조건 최적실험의 예제들

김영일,장대흥,이성백,Kim, Youngil,Jang, Dae-Heung,Yi, Seongbaek 한국통계학회 2014 응용통계연구 Vol.27 No.7

비선형모형에 대한 최적실험은 주어지는 모수의 초기값에 의존하는 특징이 있음에도 불구하고 비선형모형에 대한 최적실험은 비선형모형이 주류인 생물이나 화학공학 통계분야에서는 끊임없이 연구되어 왔다. 본 연구에서는 실험자가 다수의 실험목적을 가지고 있는 환경에서 상충되는 목적간의 균형을 맞추는 관점에서 비선형 모형에 대한 최적실험 기준을 제약 실험으로 살펴보았다. 문헌에서 존재하는 기존의 방법 뿐 아니라 새로운 융합기준도 적용하였는데 시나리오 별로 그 적용 형태를 몇 가지 비선형 모형을 통하여 알아보았다. Despite the fact that the optimal design for nonlinear model depends on the unknown quantity of parameter to estimate basically, its popularity is growing in bio and engineering statistics area since all those models in the area are virtually nonlinear. In this paper we have dealt with the case when the researcher has multiple objectives in experimentation, decision among the competing models, protection against the departure from the assumed model, and the con icting interests among design criteria. To tackle these issues we attempted several new approaches which are taking advantage of the easiness of constrained optimal design. Several nonlinear models were tested.

다중 외삽점에서의 최적 실험설계법을 위한 실험설계기준

김영일,장대흥,Kim, YoungIl,Jang, Dae-Heung 한국통계학회 2014 응용통계연구 Vol.27 No.5

실험영역을 벗어나는 다중 외삽점들에 관한 실험설계를 기획하는 경우 실험자는 종종 어느 외삽점에 더 많은 노력을 집중하여야 하는지 주어진 모형이 있다하더라도, 고민하는 경우가 있다. 본 연구에서는 이러한 상황에 관한 실험설계 문제를 다루었다. 첫 번째는 주어진 모형이 실험영역을 벗어나더라도 모형이 타당한 경우 다중 외삽점에 관한 실험설계고 다른 하나는 그렇지 않은 경우이다. 첫 번째인 경우는 비교적 기존 문헌에서 알려진 방법들이 적용될 수 있으나 그렇지 않은 경우 즉, 모형의 타당성이 의심되는 경우는 다른 실험설계기준을 제시하여야 한다, 본 연구는 이와 관련 다양한 하이브리드 방법을 제시하여 다중 외삽점에서의 문제가 어떻게 모형 불확실성하에서 전개되어야 하는지 다루어 보았다, 이를 위해 서치알고리즘의 하나인 유전알고리즘을 적용하였다. 왜냐하면 전통적인 교환알고리즘의 복잡성보다는 유전알고리즘의 효율성이 더 뛰어났다고 보기 때문이다. When setting up an experiment for extrapolation at multiple points outside the design space, we often face a difficulty in which point we should emphasize even if the polynomial model under consideration is given. In this paper we propose various methods under two possible scenarios that deal with extrapolations. One considered in this paper is the situation when the model assumed can be extended beyond the design space. In this setting, the many classical methods(including various approaches the authors proposed before) were revisited in the context of extrapolation. But the real problem arises when there is an uncertainty concerning the validity of the assumed model. Therefore, the second scenario is to develop an appropriate procedure when we have limited information about model. Consequently, a hybrid approach is suggested to deal with this issue of how to handle the multiple extrapolating under model uncertainty. A search algorithm was implemented because the classical exchange algorithm was found difficult to handle the complexity of the problem.

다양한 형상의 동일 기종 항공기에 대한 성능개량 최적 구현 방안 연구

김영일,안승범,최명석,Kim, Youngil,Ahn, Seungbeom,Choi, Myeongseok 한국군사과학기술학회 2022 한국군사과학기술학회지 Vol.25 No.3

In this paper, we studied the optimal method of improving performance for aircraft having various variants within the same type. The study defined configuration of an entire fleet of aircraft being subject to a performance improvement program. And selected the most complicated aircraft configuration among them as a Standard Aircraft for modification by according to the proposed Aircraft Selection Process for developing an optimal Aircraft Performance Improvement Process. Based on the selected the Standard Aircraft, drew a system integration design result and carried out Evaluation Test and obtained Airworthiness Certification. Created the database with the design data of the Standard Aircraft, Evaluation Test, and Airworthiness Certification results, and applied it to variants of aircraft to complete the performance improvement program with optimized schedules and costs. By applying the proposed method to IFF performance improvement program, drew optimal system integration design and completed the program with minimized schedule.

증 례 : 중형의 선천성 멜라닌 세포성 모반에서 발생한악성 흑색종의 대상포진 양 피부 전이 1예

김영일 ( Youngil Kim ),김인용 ( Inyong Kim ),채인수 ( In Soo Chae ),봉진구 ( Jin Gu Bong ),정영주 ( Young Ju Jeong ),배성화 ( Sung Hwa Bae ),심정수 ( Jeong Su Shim ),오훈규 ( Hoon Kyu Oh ),박재복 ( Jae Bok Park ),이호준 ( Ho Jun L 대한피부과학회 2015 大韓皮膚科學會誌 Vol.53 No.9

Zosteriform metastasis from malignant melanoma is a rare type of skin metastasis that shows cutaneous lesions including patches, plaques, and nodules along with dermatomes, and thus needs to be distinguished from herpes zoster skin infection. Although some authors have explained the mechanism of zosteriform metastasis, its pathogenesis remains unknown. Herein, we describe an 85-year-old woman with zosteriform metastasis of malignant melanoma arising in a medium-sized congenital melanocytic nevus. (Korean J Dermatol 2015;53(9):708∼712)

가열로에서 TDLAS를 이용한 각대산소농도측정에 관한 연구

김영일(YoungIl Kim),김기홍(KiHong Kim),이인범(Inbum Lee) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-

In this project, we studied more accurate and reliable sensing method for oxygen in reheating furnace, made the empirical model for NOx concentration based on oxygen and evaluate the stability of the Tuneable Diode Laser (Absorption) Spectroscopy(TDL(A)S). The tested oxygen monitoring system is installed at work-field reheating furnace on hot roll at POSCO and compared with the Zr sensor system which shows too sensitive because it measures oxygen concentration on a spot unlike TDLS sensor which is successfully applied at 13m-width reheating furnace to measures the line average along the Optical Path Line(OPL).

전기차 DR 반응방식에 따른 V2G 충전량 민감도 분석

김영일(YoungIl Kim),김진호(JinHo Kim),한태경(TaeKyung Hahn) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.7

첨단안전자동차의 국제안전시험 적용을 위한 무인 평가 시스템 개발 - Part Ι

김영일(Youngil Kim),이승환(Seunghwan Lee),소민우(Minwoo Sho),권재준(Jaejoon Kwon),홍태욱(Taewook Hong),박기홍(Kihong Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

The collision avoidance system, a component of the active safety system in automobiles, is constantly developing to reduce further transportation-related fatalities and injuries. As a result, various automotive manufacturers are interested in upholding international safety test standards and the objective evaluation methods for the next prospective active safety system. Under an international paradigm of vehicle safety, notable organizations such as the EURO NCAP will also rate the AEBS (Autonomous Emergency Braking System) in 2014 to assess vehicle safety performance as set out by both domestic and overseas automotive manufacturers. The currently existing active safety assessment system is classified under two significant methods. One is a static test via applying a vehicle-shaped balloon or dummy to the vehicle. The second is a dynamic test involving a vehicle equipped with a dummy by a crane for crash-test simulation. The main advantage of these experiments is that the following equipment can be reused for future crash-test studies. These methods should not, however, be exempt from uncertainty and further limitations. For instance, there is a high probability that environmental sensors attached to crash-test vehicles may miss detection, record a false alarm, or that the dummy, equipped with the crane, cannot be driven in the same way as a real-life vehicle, further hindering overall consistencies of each test. Therefore, in this paper, we have developed an evaluation system utilizing an automated vehicle to overcome such limitations of the conventional active safety assessment system.