Robust Multirate Control Scheme With Predictive Virtual Lanes for Lane-Keeping System of Autonomous Highway Driving

Son, Young Seop,Kim, Wonhee,Lee, Seung-Hi,Chung, Chung Choo IEEE 2015 IEEE Transactions on Vehicular Technology VT Vol.64 No.8

<P>In this paper, we propose a new approach for a robust multirate lane-keeping control scheme with predictive virtual lanes. First, the multirate lane-keeping control scheme is proposed to improve the lane-keeping performance and to reduce the ripple in the yaw rate. To improve the lane-keeping performance on a curved road, the integral of the lateral offset error is added to the state feedback controller. A multirate Kalman filter (KF) has been developed to resolve the problems caused by slow lane detection due to the vision processing system. This multirate KF estimates vehicle states at a fast rate using a microprocessor. Utilizing the estimated states, the linear quadratic state feedback control operates at the same fast update rate of the microprocessor. Thus, a multirate control scheme can reduce the ripple in the yaw rate. Second, we propose a virtual lane prediction method that compensates for the momentary failure of lane detection from unexpected problems. If the camera sensor momentarily fails while obtaining lane information, the predicted virtual lane can be substituted for the lane detection using the camera sensor in the proposed control scheme. Thus, the proposed control scheme can normally operate when the lane information is momentarily unavailable. The performance of the proposed method was evaluated via experiments.</P>

Conceptual design of emergency communication system to cope with severe accidents in NPPs and its performance evaluation

Son, Kwang Seop,Kim, Chang Hwoi,Kang, Hyun Gook Elsevier 2015 Annals of nuclear energy Vol.76 No.-

<P><B>Abstract</B></P> <P>The Fukushima accident induced by the great earthquake and tsunami reveals the vulnerability of I&C System. In the severe environment, the normal I&C system did not work properly and results in false information about the internal situation in NPP. Eventually the accident was not properly handled at the early stage. Therefore advanced emergency response system using a wireless channel is necessary to cope with the severe accident. In this paper, we introduce the ERS consisting of the HMS and MCS the ECS linking the HMS with MCS and the performance requirement of the ECS is analyzed. The ECS satisfying the requirement is designed conceptually and the performance of the ECS is evaluated through analysis and simulator. To secure a reliable and diverse configuration, the ECS is configured as the dual system which consists of the terrestrial communication and satellite communication. The terrestrial communication system is designed based on the IEEE 802.11. Analyzed performance results prove that the performance requirement can be sufficiently achieved. But if the scalability of data capacity is considered later, use of the advanced 802.11 standard such as 802.11n and multiple signal paths between the HMS and MCS are necessary. In the satellite communication system, the FDMA is used in the status link and the DSSS is used in the control link. The network supporting various data rates is designed and the communication link budget is analyzed considering the link availability of 99%. The designed satellite communication system can secure the link margin of 1.3–15.7dB.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The emergency communication system requires the performances of the throughput of 1Mbps, BER of 10<SUP>−6</SUP> and network configuration of 1:12 communication. </LI> <LI> The emergency communication system consists of the terrestrial communication and satellite communication system. </LI> <LI> In the terrestrial communication system, at least two wireless repeaters are needed to secure LOS and the throughput and delay time are 16Mbps and 16ms, respectively. </LI> <LI> In the satellite communication system, DSSS and FDMA are used and the fade margin range is from 1.3 to 16dB. </LI> </UL> </P>

일반논문 : 전남방언의 정도부사에 대한 연구2 -기능관 의미 특성 및 지리적 분포를 중심으로-

손춘섭 ( Son Chun Seop ) 전남대학교 호남학연구원 2004 호남문화연구 Vol.34 No.-

Development of the framework for quantitative cyber risk assessment in nuclear facilities

Kwang-Seop Son,Jae-Gu Song,Jung-Woon Lee Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6

Industrial control systems in nuclear facilities are facing increasing cyber threats due to the widespread use of information and communication equipment. To implement cyber security programs effectively through the RG 5.71, it is necessary to quantitatively assess cyber risks. However, this can be challenging due to limited historical data on threats and customized Critical Digital Assets (CDAs) in nuclear facilities. Previous works have focused on identifying data flows, the assets where the data is stored and processed, which means that the methods are heavily biased towards information security concerns. Additionally, in nuclear facilities, cyber threats need to be analyzed from a safety perspective. In this study, we use the system theoretic process analysis to identify system-level threat scenarios that could violate safety constraints. Instead of quantifying the likelihood of exploiting vulnerabilities, we quantify Security Control Measures (SCMs) against the identified threat scenarios. We classify the system and CDAs into four consequence-based classes, as presented in NEI 13-10, to analyze the adversary impact on CDAs. This allows for the ranking of identified threat scenarios according to the quantified SCMs. The proposed framework enables stakeholders to more effectively and accurately rank cyber risks, as well as establish security and response strategies.

Multi-rate Kalman Filter based lane detection method

Young Seop Son(손영섭),Wonhee Kim,Chung Choo Chung(정정주) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5

청각장애인을 위한 긴급경고용 픽토그램 개발연구

손정섭(Son, Jeong Seop),이은실(Yi, Eun Sil) 한국디자인학회 2017 한국디자인학회 학술발표대회 논문집 Vol.2016 No.10

Asynchronous Sensor Fusion using Multi-rate Kalman Filter

Young Seop Son(손영섭),Wonhee Kim(김원희),Seung-Hi Lee(이승희),Chung Choo Chung(정정주) 대한전기학회 2014 전기학회논문지 Vol.63 No.11

We propose a multi-rate sensor fusion of vision and radar using Kalman filter to solve problems of asynchronized and multi-rate sampling periods in object vehicle tracking. A model based prediction of object vehicles is performed with a decentralized multi-rate Kalman filter for each sensor (vision and radar sensors.) To obtain the improvement in the performance of position prediction, different weighting is applied to each sensor’s predicted object position from the multi-rate Kalman filter. The proposed method can provide estimated position of the object vehicles at every sampling time of ECU. The Mahalanobis distance is used to make correspondence among the measured and predicted objects. Through the experimental results, we validate that the post-processed fusion data give us improved tracking performance. The proposed method obtained two times improvement in the object tracking performance compared to single sensor method (camera or radar sensor) in the view point of roots mean square error.

정도부사의 의미와 기능에 대한 고찰

손춘섭(Chun Seop Son) 한국어의미학회 2001 한국어 의미학 Vol.9 No.-

This study aims to understand the meaning and function of degree adverbs. There has been no reasonable basis to set up the list of degree adverbs. It means that there is a lack of understanding the meaning and function of these categories. Degree adverbs must be used as a term that indicates adverbs with the semantic feature `degree` : It is intra-lexical distinctive, multivalent, and a kind of relative concept. It necessarily accompanies `norms of judgment` and also grade `degree scales`. The degree adverbs that this paper has treated such as maeu, mucheok, gajang, etc. do not have `degree`. Therefore, these are not appropriate to have the name like degree adverbs. We need to use more appropriate degree adverbs than the existing terms and it depends on their meanings and functions.

한국어 어문 규범의 복잡성과 표기 오류의 상관성 연구

손춘섭(Chun seop Son) 한국어교육연구학회 2018 한국어교육연구 Vol.- No.9

한국어 어문 규범 중 어떤 내용은 한국어 사용자들이 바르게 적용하고자 하여도 규정 자체의 문제 때문에 오류 발생의 빈도가 높을 수밖에 없는 것들이 있다. 동일한 원형을 지닌 것으로 보이는 형태에 대해 여러 가지 이형태 표기를 인정함으로써 내용이 복잡하고 단서가 많아진 규정들이 그러한 예이다. 이들 규정이 한국어의 특성을 최대로 고려한 것이라고 할지라도, 단순하고 단서가 적은 규정들에 비해 처음부터 사용자가 표기 오류를 일으키게 할 가능성이 높다. 이 논문은 한국어 어문 규범 자체의 복잡성이 사용자들의 표기 오류에 어떤 영향을 미치는지를 알아보고자 하는 목적을 갖는다. 이러한 목적을 달성하기 위하여, 본고는 한국어 어문 규범 중 내용이 복잡하고 단서가 많은 규정의 적용을 받는 세 가지 표기 형태에 대하여 오류 사례들을 수집하여 분석하였다. 분석 결과, 규정이 단순하고 단서가 없는 어문 규범에서 비해 내용이 복잡하고 단서가 많은 규정을 적용하는 표기에 대한 한국어 사용자들의 오류율이 상당히 높은 것으로 파악되었다. 예를 들면 ‘널따랗다’의 표기에서는 바른 표기 대비 211.8%의 오류율을 나타냈으며, ‘수벌’의 경우 75%, ‘위층’의 경우 97.1%의 오류율을 보이기도 했다. 이 논문은 한국어 사용자들이 많은 오류를 범하는 표기 사례와 원인에 대해 실증적으로 검증함으로써 향후 표기의 편의성과 정확성을 높일 수 있는 관련 어문 규범 개정에 참고가 될 것으로 기대한다. Some of the Korean language norms, even if they are intended to be used by Korean users correctly, have a high incidence of the spelling errors due to the problem of regulation itself. An example is the more complicated and more cryptic rules by allowing different allomorph for forms that appear to have the same basic morpheme. Even if these regulations take maximum consideration of the characteristics of Korean language, there is a high possibility that the user will cause a spelling error from the beginning, compared to the simple rules. The purpose of this paper is to investigate the effect of the complexity of Korean language norms on the errors of the users spelling. In order to accomplish this purpose, this paper collected and analyzed errors in three types of morphemes which are spelled Korean users. As a result, the spelling error rate of Korean users was found to be very high. For example, in the case of ‘neolttarata’, the error rate is 211.8%, in the case of ‘subeol’, the error rate is 75%, in the case of ‘wicheung’, the error rate is 97.1%, compared to the correct spelling. This paper will be useful for revising related Korean language norms, which can improve the convenience and accuracy of spelling of Korean users in the future by verifying empirically the cases.

좌선회, 우선회 원편파 모두 수신 가능한 차량용 도파관 슬롯 배열 안테나

손광섭(Kwang-Seop Son),박찬구(Chan-Gu Park) 대한전자공학회 2009 電子工學會論文誌-TC (Telecommunications) Vol.46 No.2

본 논문에서는 차량용 위성 안테나에 적합한 평판형 도파관 슬롯 배열 안테나를 설계 제작 하였다. 제안된 안테나는 마이크로스트립 패치 배열 안테나의 유전체 손실 및 급전 라인의 손실을 대체하고자 조립하기에 간단한 3층 구조의 급전 도파관을 이용하여 고이득의 안테나를 구현하였다. 또한 얇은 단일 필름을 이용한 편파기를 사용하여 위성에서 송신한 RHCP(Right Handed Circular Polarization), LHCP(Left Handed Circular Polarization)를 기계적으로 모두 수신 가능하도록 설계 제작하였다. 제작된 4X8 배열 안테나의 이득은 27.5㏈, 8X16 배열 안테나의 이득은 32㏈이다. In this paper, The planar waveguide slotted antenna is presented for a satellite communication of vehicles. In stead of the microstrip patch array antenna having a dielectric loss and a feeding loss, the proposed antenna has the 3-layered waveguide feeding network structure for assembling easily. Also this antenna can receive mechanically both RHCP and LHCP transmitted from a satellite using a polarizer made from a thin single layer film. The Gain of the proposed 4X8 array antenna is 27.5㏈ and the gain of 8X16 array antenna is 32㏈.