• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제49권3호
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• pp.135-141
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• 2023

Objectives: This study aimed to develop and validate machine learning (ML) models using H₂O-AutoML, an automated ML program, for predicting medication-related osteonecrosis of the jaw (MRONJ) in patients with osteoporosis undergoing tooth extraction or implantation. Patients and Methods: We conducted a retrospective chart review of 340 patients who visited Dankook University Dental Hospital between January 2019 and June 2022 who met the following inclusion criteria: female, age ≥55 years, osteoporosis treated with antiresorptive therapy, and recent dental extraction or implantation. We considered medication administration and duration, demographics, and systemic factors (age and medical history). Local factors, such as surgical method, number of operated teeth, and operation area, were also included. Six algorithms were used to generate the MRONJ prediction model. Results: Gradient boosting demonstrated the best diagnostic accuracy, with an area under the receiver operating characteristic curve (AUC) of 0.8283. Validation with the test dataset yielded a stable AUC of 0.7526. Variable importance analysis identified duration of medication as the most important variable, followed by age, number of teeth operated, and operation site. Conclusion: ML models can help predict MRONJ occurrence in patients with osteoporosis undergoing tooth extraction or implantation based on questionnaire data acquired at the first visit.

• 한국경제지리학회지
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• 제24권2호
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• pp.143-162
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• 2021

미국-멕시코 국경지대는 멕시코의 마킬라도라 산업에 대한 세계 다국적기업들의 투자로 인해 고용확대, 인구증가, 산업발달이 이루어지고, 특히 국경지대의 쌍둥이 도시들은 많은 사회경제적 변화를 겪게 되었다. 1965년에 시작된 멕시코의 마킬라도라 프로그램은 외국기업의 투자를 유치하기 위한 보세가공 산업정책이었는데, 2006년부터는 멕시코인 소유의 수출기업을 포함하는 IMMEX 프로그램으로 대체되었다. 마킬라도라를 포함한 IMMEX 기업들은 2007년 이후 업체수는 큰 변화가 없는 반면 업체당 종사자수는 점차 대형화하고 있다. 업종별로 보면 자동차, 항공기와 관련된 운송장비제조업이 가장 크게 성장하였으며, 과거 마킬라도라 산업에서 큰 비중을 차지하던 섬유·직물·의류제조업은 상대적으로 침체의 길을 걷고 있다. IMMEX의 비제조업 분야에서는 종사자수와 해외매출액에 있어서 농업의 비중이 압도적이다. IMMEX 기업들의 지역적 분포에서는 티화나와 후아레스가 압도적으로 높은 비중을 차지하고 있다.

• PNF and Movement
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• 제17권2호
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• pp.329-337
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• 2019

Purpose: Ultrasound imaging is commonly used to measure the pennation angle of human skeletal muscles in vivo. However, manual assessment of the pennation angle using ultrasound images is subjective and time-consuming and requires a high level of examiner skill. The architectural analysis of human skeletal muscles is thus challenging. Automated approaches using image processing techniques are therefore required to estimate the pennation angle in ultrasound images. The purpose of this study was thus to assess the intra-tester and inter-tester reliability and validity of the pennation angle using an automatic measurement program. Methods: Twenty-two healthy young adults (mean age = 22.55 years) with no medical history of neurological or musculoskeletal disorders voluntarily participated in this study. Ultrasound imaging was used to measure the pennation angle of the gastrocnemius muscle at rest. One examiner acquired images from all the participants. The intra-tester and inter-tester reliability were evaluated using the intraclass correlation coefficient (ICC) to estimate reliability. Validity was measured using Pearson's correlation coefficient. Results: The intra-rater reliability was excellent for the automatic pennation angle measuring program and the manual pennation angle assessment method (ICC>0.95). The inter-rater reliability was also excellent for both methods (ICC>0.93). All the correlation coefficients for the automatic pennation angle measuring program and the manual pennation angle assessment method were 0.79, which indicated a significantly positive correlation (p<0.05). Conclusion: Pennation angle measurement using the automatic pennation angle measuring program showed acceptable reliability and validity. This study therefore demonstrated that the automatic measuring program was able to automatically measure the pennation angle of skeletal muscles using ultrasound images, and thus made it easy to investigate skeletal muscle architecture.

• 한국항공우주학회지
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• 제37권4호
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• pp.359-366
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• 2009

자동 코드생성이란 MATLAB의 Simulink 환경에서 설계한 블록 다이어그램을 c 코드로 변환시켜 주는 기능으로 MATLAB과의 연동을 통해 소프트웨어 설계부터 검증까지의 통합된 개발환경을 제공함으로서 개발 시간을 크게 줄일 수 있다. 하지만 생성된 c 프로그램을 무인기에 탑재하기 위해서는 소프트웨어의 신뢰성 확보가 필요하며 특히 원본이 되는 Simulink 블록의 검증이 중요하다. 본 연구에서는 자동 코드생성 기능을 고려하여 Simulink 환경에서 구성한 무인기용 자동비행 프로그램을 DO-178B에 명시된 소프트웨어 시험 과정에 따라 검증하였다. 이 과정을 통해 최종 프로그램은 기능 요구사항에 대한 만족함을 확인했을 뿐 아니라 Decision Coverage 93%, Condition Coverage 95% 그리고 MC/DC 90%로 구조적 측면에서 검증을 수행했다.

• 한국정보통신학회논문지
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• 제18권5호
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• pp.1201-1206
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• 2014

소규모 상점은 상품 관리를 대부분 수기에 의존하고 있다. 이러한 수기 관리는 다양한 제품의 입출고 현황을 관리하는데 제한적이며 실시간 상품현황 관리는 별도의 통계 시스템을 이용해야 한다. 이러한 문제점을 해결하기 위해 개발된 기존의 POS 시스템은 고가의 비용 및 공간의 제약으로 중대형 및 특수매장 위주로 운용되고 있다. 이 때문에 소규모 상점의 수기에 의한 상품관리 대신 비용부담이 적지만 자동화된 새로운 상품관리 시스템이 필요하다. 본 논문에서는 NFC 기능을 탑재한 스마트폰을 활용하여 소규모 상점에서 판매되는 상품을 실시간으로 관리할 수 있는 시스템을 개발하였다.

• 한국의학물리학회지:의학물리
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• 제28권3호
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• pp.122-128
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• 2017

Eclipse Scripting Application Programming Interface (ESAPI) was devised to enhance the efficiency in such treatment related workflows as contouring, treatment planning, plan quality measure, and data-mining by communicating with the treatment planning system (TPS). It is provided in the form of C# programming based toolbox, which could be modified to fit into the clinical applications. The Scripting program, however, does not offer all potential functionalities that the users intend to develop. The shortcomings can be overcome by combining the Scripting programming with user-executable program on Windows or Linux. The executed program has greater freedom in implementation, which could strengthen the ability and availability of the Scripting on the clinical applications. This work shows the use of the Scripting programming throughout the simple modification of the given toolbox. Besides, it presents the implementation of combining both Scripting and user-executed programming based on MATLAB, applied to automated dynamic MLC wedge and FIF treatment planning procedure for promoting the planning efficiency.

• Interdisciplinary Bio Central
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• 제1권1호
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• pp.5.1-5.4
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• 2009

This article is an addendum to the authors’ previous article (Kim, J. et al. (2008) Plant Cell 20, 307-319). The instrumentation and software described in this article were used to analyze the circadian leaf movement in the previous article. Here, we provide detailed and practical information on the instrumentation and the software. The source code of the LMA program is freely available from the authors. The circadian clock regulates a wide range of cyclic physiological responses with a 24 hour period in most organisms. Rhythmic leaf movement in plants is a typical robust manifestation of rhythms controlled by the circadian clock and has been used to monitor endogenous circadian clock activity. Here, we introduce a relatively easy, inexpensive, and simple approach for measuring leaf movement circadian rhythms using a USB-based web camera, public domain software and a Leaf Movement Assay (LMA) program. The LMA program is a semi-automated tool that enables the user to measure leaf lengths of individual Arabidopsis seedlings from a set of time-series images and generates a wave-form output for leaf rhythm. This is a useful and convenient tool for monitoring the status of a plant's circadian clock without an expensive commercial instrumentation and software.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.395-400
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• 2007

LRT(Light Railway Train), which is a intermediate system of train and bus, is arose for the solution of subway construction cost and the transportation capacity of bus. LRT was introduced in 1980's. About 30 local governments are plan to introduce LRT or constructing LRT, at present. AGT(Automated Guide-way Transit) system, which is a kind of LRT, is operated without driver. Rubber wheeled AGT system can reduce the noise and vibration compare to steel wheeled AGT, so it is estimated as ideal transportation system for urban area. And live loads at bridge are classified as the static load of vehicle and the dynamic wheel contact load which is occurred from the interaction of bridge and vehicle vibration, and the surface roughness. In the case of AGT system, the dynamic increment factor of bridge is greater than the normal train bridge and roadway bridge, because, the weight of AGT vehicle is more light that the train of truck. The exact method for dynamic increment factor is experiment. But this method is needed much money and time, moreover, this method cannot be adopted in design. Therefore, a simulation program for the interaction of AGT bridge, vehicle and surface roughness was developed, in this study. And the program was verified by experiment. As a result, the accuracy of the simulation program can be verified.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1998년도 추계학술대회
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• pp.201-202
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• 1998

In this paper we suggested an automated method for detecting and counting rapid eye movement(REM) using EOG during sleep. This method is formulated by two step fuzzy logic. At first step, the velocity and the distance of single channel eye movement are used for the fuzzy input to get the possibility of being REM at each EOG. At second step, the two possibility values of both EOG from the first step and the correlation coefficient of both eye movements are used for the fuzzy logic input, and the output is the final possibility of being Rapid Eye Movement. We applied this algorithm to the normal and narcoleptic sleep data and compared the difference. We found the possibility that the count of REM can be a parameter that has significant physiological meanings.

• 한국농림기상학회지
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• 제3권1호
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• pp.16-21
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• 2001

1997~1998년에 무인기상관측장비(AWS)로부터 얻어진 기상자료와 고추 역병 발병과의 상관관계를 기초로 하여 고추역병 발병모형들을 작성하였다. 그 중에서 $R^2$값이 가장 높은 모형을 이용하여 AWS 시스템기상 파일을 입력받아서 발병률을 추정해주는 컴퓨터 시스템(PEPBLIGHT)을 구축하였다. 이 컴퓨터 시스템은 쉽게 무인기상관측장치로부터 기상 자료를 입력받을 수 있으며, 다른 기종의 무인기상관측장치와 다른 발병예측모형으로 이용할 경우에도 호환성이 있도록 하였다. 또한 AWS 미기상 자료를 SAS 입력자료로 사용하기에 적합한 형태로 변환해 파일로 저장해 주는 기능도 가지고 있다. 국내에서 처음으로 개발된 고추 역병 예찰 프로그램인 PEPBLIGHT는 MS사의 윈도운영체제로 운영되는 PC에서 사용할 수 있기 때문에 농가 수준에서도 이용할 수 있을 것이다.