KASS 시스템 운영을 위한 상태감시 도구 개발

손민혁,이병석 한국항행학회 2023 韓國航行學會論文誌 Vol.27 No.5

The Korea Augmentation Satellite System is an SBAS system being developed with the goal of providing SoL (Safety of Life) in accordance with ICAO (International Civil Aviation Organization) standards by December 2023. Monitoring the status of the system is essential for the continuous provision of KASS services, and a status monitoring tool should be developed for this purpose. The development of a status monitoring tool was divided into SYSRT (SYStem Real Time monitoring tool), SMSPP (Subsystem Monitoring Statistics tool for Post Processing) depending on the purpose. Tool development was completed through a series of procedures: requirements definition, design, development, and verification. To verify the status monitoring tool, the KASS system’s real data (August 2023) were used to verify it, and the results were statistically analyzed to derive operating time and operating rate. It plans to use these tools to support continuous service provision for SoL service starting after this year.

KASS 유지보수 정의 및 절차 개발

손민혁,윤영선,이병석 한국항행학회 2022 韓國航行學會論文誌 Vol.26 No.6

KASS (korea augmentation satellite system)는 국제민간항공기구 (ICAO; international civil aviation organization)의 항공통신 관련 국제표준권고 (SARPs Annex 10)에 따른 항공용 서비스 성능이 보장되어야 하는 한국형 SBAS (satellite based augmentation system)이다. 목표 서비스 성능의 보장을 위해서는 운영 시스템이 안정적으로 동작하고 유지, 관리되어야 하며 이를 위해 유지보수 체계가 확립되어야 한다. 유지보수 관점에서 KASS 하위시스템을 교체유닛 단위로 정의하고 유지보수 조직, 유지보수 절차를 정의하였다. 또한, 유지보수 수행을 위한 교체유닛 단위의 유지보수 임무를 산출하였으며 산출된 임무가 앞서 정의된 교체유닛 단위를 충분히 포괄하는지 검증하였다. 본 연구를 통해 산출된 유지보수 임무는 2023년 말 본격적인 항공용 서비스 제공 전, 실 운영 준비과정에서 검증될 것이며 지속해서 업데이트될 것이다.

2023 농업기계학회 춘계학술대회

손민혁 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.1

RFID 기반 재고조사용 이동로봇 시스템의 설계

손민혁,도용태 한국로봇학회 2011 로봇학회 논문지 Vol.6 No.1

In many industries, the accurate and quick checking of goods in storage is of great importance. Most today's inventory checking is based on bar code scanning, but the relative position between a bar code and an optical scanner should be maintained in close distance and proper angle for the successful scanning. This requirement makes it difficult to fully automate the inventory information/control systems. The use of RFID technology can be a solution for overcoming this problem. The mobile robot presented in this paper is equipped with an RFID tag scanning system, that automates the otherwise manual or semi-automatic inventory checking process. We designed the robot system in a quite practical approach, and the developed system is close to the commercialization stage. In our experiments, the robot could collect information of goods stacked on shelves autonomously without any failure and maintain corresponding database while it navigated predefined paths between the shelves using vision.

현장 분석을 통한 위성항법기반 교통인프라 네트워크 수신국 사이트 선정 방법

손민혁,김규헌,이은성,허문범 韓國航行學會 2012 韓國航行學會論文誌 Vol.16 No.6

본 논문에서는 위성항법기반 교통인프라 기술개발의 네트워크 수신국 사이트 선정을 위하여 사전 조사, 현장 조사, 현장 환경 분석의 3단계 선정 절차를 제시하였으며 실제 테스트베드인 오창 지역을 기준으로 4개의 후보지를 도출하였다. IGS, NGS 등과 같은 국제상시관측기관이 제안하는 사이트 선정 권고안을 정리하여 위성 항법기반 교통인프라 기술개발에 적합한 요구사항을 도출하고 이를 만족하는 1차 후보군을 선정하는 작업이 사전조사이며, 1차 후보군에 대한 육안 가시검사 및 환경, 기타 조사를 통하여 2차 후보군을 선정하는 작업이 현장조사이다. 또한 선정된 2차 후보군에 대해 상공장애도 분석과 전파환경 분석을 통해 최종적으로 수신국 사이트 후보지를 선정하는 것이 현장 환경 분석이다. 위와 같은 일련의 선정 절차를 통해 1차 16개 후보군, 2차 7개 후보군, 3차 최종 4개의 수신국 사이트를 효과적으로 선정할 수 있었다. In this paper a three step procedure was derived to select the GNSS network receiving site candidates for GNSS based infrastructure technology development and according to the proposed procedure the 4 site candidates was selected for final network configuration. In the first step, the site requirement was produced for GNSS based infrastructure technology development referring regulation of the international organizations related to permanent GNSS data receiving and the first candidates were selected using the proposed requirement. In the second step, the second candidates were selected among the first candidates by analyzing the visual measurement, environment test and so on. In the third step the final candidates were selected among the second candidates by analyzing sky clearance, radio frequency interference. Through above the three step procedure 16,7,4 candidates of site were selected sequentially and receiving station site could be effectively selected.

BERT 마스크 언어 모델을 활용한 내부자 위협행위 탐지

손민혁,이상준 한국지식정보기술학회 2022 한국지식정보기술학회 논문지 Vol.17 No.4

The risk of insider threat is increasing due to the increase in telecommuting because of pandemics. Companies have various security solutions to reduce insider threats, but there is a limit to capturing all human behavior. To solve this problem, studies on the detection of insider threat behavior using deep learning are being actively conducted. However, two problems that attack data is very scarce due to the nature of insider threat behavior, and time and action data must be learned at the same time remain challenges. In this paper, we propose an insider threat behavior detection model using the mask language model, which is a pre-learning method of Bi-directional Encoder Representation of Transformer(BERT). We used a CERT dataset for learning and used a custom tokenizer to map the data to actions and times at 30-minute intervals. The characteristics were learned by inputting only normal data into the mask language model, and the sum of the loss values derived from normal data was calculated as a threat score, and the maximum value was set as a detection boundary for each user. After that, if the threat score that occurs when new data is put into the model exceeds the detection boundary, it was detected as an abnormal behavior. The experimental results showed that compared to existing deep learning models, the model reacted sensitively when the behavior occurred at an unusual time, and in the case of scenarios where preparation and initiation of threat behavior were separated, appropriate detection performance was considered. As a result, the unbalanced dataset which was a challenge of detecting insider threat behavior could use the large amount of normal data as an advantage. And unlike the existing LSTM derivatives, sufficiently detailed time data can be mapped to behavior and used for learning.

육상교통 항법을 위한 네트워크기반 위성항법보정 시스템의 구성

손민혁,손은성,이은성,허문범,남기욱,Son, Minhyuk,Son, Eunseong,Lee, Eunsung,Heo, Moon-Beom,Nam, Gi-Wook 한국항공운항학회 2013 한국항공운항학회지 Vol.21 No.4

In this paper, a configuration procedure of a transportation infrastructure system for GNSS based very precise real-time positioning is proposed. This infrastructure system consists of several receiving station, a central station, and communication sub-systems. The required performance, design, implementation and verification of each sub-system are explained respectively. The required performance can be broken down into accuracy, integrity, stability, processing time. The design of the each sub-system is performed in accordance with the required performance and each sub-system is built with regard to the design. Lastly the implemented system is verified in comparison with the required performance.

다양한 노면 조건에서의 능동 긴급 제동 시스템(AEBS) 성능 해석 시뮬레이션

손민혁(Minhyuk Son),남창훈(Changhoon Nam) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11

This paper presents the use of software tools that together provide the ability to cover critical aspects of active safety system design and performance analysis simulation. One of the software tools (PreScan) focuses on the design of the sensing and control systems, as well as the evaluation for a wide range of traffic and weather scenarios. Another software tool (CarSim) takes care of the detailed vehicle dynamics and has the function for external tire model and road profiles. For detailed the tireroad contact patch and tire forces, a Short Wavelength Intermediate Frequency Tyre (SWIFT) model has considered. A road profile model can generate by OpenCRG easily and coupled with the tire models in the CarSim. By means of an application example of an Active Emergency Braking System (AEBS) under rough road conditions, the combined use of those software tools to design and evaluate the performance of active safety system is demonstrated.

인문,사회과학편 : 스포츠센터 지도자의 비언어적 커뮤니케이션과 감정반응,서비스가치, 고객만족의 관계

손민혁(MinHyukSon),추나영(NaYoungChoo),조송현(SongHyunCho) 한국체육학회 2014 한국체육학회지 Vol.53 No.5

이 연구는 스포츠센터 지도자의 비언어적 커뮤니케이션과 감정반응, 서비스가치, 고객만족의 관계를 규명하는데 목적이 있다. 연구대상은 부산광역시 및 경상남도 소재 스포츠센터 회원을 모집단으로 하여 300명을 편의표본추출방법에 의해 표집한 후 최종적으로 282명의 자료를 분석에 사용하였다. 자료처리는 빈도분석, 타당도 분석, 신뢰도 분석, 상관분석, 회귀분석 등을 실시하였으며 이상의 연구방법을 통해 나타난 결과는 다음과 같다. 첫째, 스포츠센터 지도자의 비언어적 커뮤니케이션 가운데 시각적 행동과 개인적 특성은 서비스가치, 감정반응, 고객만족에 유의한 영향을 미쳤다. 둘째, 고객의 감정반응은 서비스가치와 고객만족에 유의한 영향을 미쳤다. 셋째, 고객이 인지한 서비스가치는 고객만족에 유의한 영향을 미쳤다. The purpose of this study was to investigate a casual relationship between the nonverbal communication of sports centre instructor and service value, emotional reactions, customer satisfaction. The subject of this study was members who are registered in the sports center in Busan and Gyeongsangnam-do Province, 340 samples were selected using convenience sampling method. Among the 340 responses, the study excluded 58 invalid responses due to the unfinished, the improperly marked, and the biased; and, finally selected 282 for the analysis. By using the SPSS version 21.0 for collected data were performed including an exploratory factor analysis, a Cronbach’s alpha, and a simple and multiple regression analysis. The statistical significance was determined at the level of .05. Results were as followed. First, visual behaviour and individual characteristic of sports centre instructors’ nonverbal communication had significant effected on emotional reaction, service value, and customer satisfaction. Second, emotional reaction of sports center members had significant effected on service value and customer satisfaction. Lastly, service value of sports center members had significant effected on customer satisfaction.

정밀 위치결정 성능 최적화를 위한 위성항법 수신국 네트워크 구성

손민혁 ( Min Hyuk Son ),김규헌 ( Geo Heon Kim ),이은성 ( Eun Sung Lee ) 한국항공운항학회 2012 한국항공운항학회지 Vol.20 No.4

In this paper, requirements of GNSS receiver station installation are derived for optimizing the performance of network based GNSS precise positioning by concern of international organization(IGS, NGS) recommendation. Also a analysis method of network based GNSS precise positioning is suggested in order to evaluate the availability depending on various network configurations. To evaluate network candidates, a performance evaluation method is proposed for positioning of users according to a geometric configuration and the baseline distance. After the proposed method is used to Ochang region that is a the test area 6 network candidates are derived and the performance of positioning was analyzed. Finally, Ansung, Gongju,Eumsung, Boeun network configuration was selected as the best positioning performance. An optimal Receiving station network was selected using the proposed method.