• 한국ITS학회 논문지
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• 제7권3호
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• pp.95-99
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• 2008

본 논문은 저 전력 설계 자동화를 위한 새로운 최소 자원 상위 레벨 합성 알고리즘을 제안한다. 제안된 알고리즘은 상위 레벨 합성 동안에 기능 연산자의 소비 전력 최소화를 위해 효율적인 접근 방식을 실행한다. 본 논문에서는 CDFG의 스위칭 활동을 감소시키기 위해 모든 제어 스텝을 하나씩 차례로 방문한다. 레지스터 공유 알고리즘은 모든 변수들의 생명 주기를 분석 한 후, 최소의 레지스터들을 결정한다. 또한 기능 단위의 입력 신호의 특성에 따라 모든 제어 스텝을 하나씩 차례로 방문하고, 갈망 방법에 따라 각 제어 스텝의 소비 전력을 최소화하여 자원 할당을 수행한다. 제안된 저 전력설계 자동화를 위한 최소 자원 상위 레벨 합성 알고리즘은 다양한 벤치마크들의 예를 통해 효율성을 입증한다.

• Journal of Power Electronics
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• 제16권6호
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• pp.2109-2118
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• 2016

Based on the space vector pulse width modulation (SVPWM) theory, this paper realizes an easier SVPWM strategy, which is equivalently implemented by CBSPWM with zero-sequence voltage injection. The traditional SVPWM strategy has no effect on controlling the neutral-point voltage balance. In order to solve the neutral-point voltage unbalance problem for neutral-point-clamped (NPC) three-level inverters, this paper proposes a neutral-point voltage balance controller. The proposed controller realizes controlling the neutral-point voltage balance by dynamically calculating the offset superimposed to the three-phase modulation waves of an equivalent SVPWM strategy. Compared with the traditional SVPWM strategy, the proposed neutral-point voltage balance controller has a strong ability to balance the neutral-point voltage, has good steady-state performance, improves the output waveforms quality and is easy for digital implementation. An experiment has been carried out on a NPC three-level inverter prototype based on a digital signal processor-complex programmable logic device (DSP-CPLD). The obtained experimental results verify the effectiveness of the proposed neutral-point voltage balance controller.

• 한국안전학회지
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• 제29권1호
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• pp.86-92
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• 2014

This paper provides an integrated view on human and system interaction in advanced and automated systems, which adopting computerized multi-functional artifacts and complicated organizations, such as nuclear power plants, chemical plants, steel and semi-conduct manufacturing system. As current systems have advanced with various automated equipments but human operators from various organizations are involved in the systems, system safety still remains uncertain. Especially, a human operator plays an important role at the time of critical conditions that can lead to catastrophic accidents. The knowledge on human error helps a risk manager as well as a designer to create and control a more credible system. Several human error theories were reviewed and adopted for forming the integrated perspective: gulf of execution and evaluation; risk homeostasis; the ironies of automation; trust in automation; design affordance; distributed cognition; situation awareness; and plan delegation theory. The integrated perspective embraces human error theories within three levels of human-system interactions such as affordance level, psychological logic level and trust level. This paper argued that risk management process should dealt with human errors by providing (1) reasoning improvement; (2) support to situation awareness of operators; and (3) continuous monitoring on harmonization of human system interaction. This approach may help people to understand risk of human-system interaction failure characteristics and their countermeasures.

• 농업과학연구
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• 제48권3호
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• pp.617-627
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• 2021

In the field of on-road motor vehicles, the level for autonomous driving technology is defined according to J3016, proposed by Society of Automotive Engineers (SAE) International. However, in the field of agricultural machinery, different standards are applied by country and manufacturer, without a standardized classification for autonomous driving technology which makes it difficult to clearly define and accurately evaluate the autonomous driving technology, for agricultural machinery. In this study, a method to classify the autonomy levels for autonomous agricultural machinery (ALAAM) is proposed by modifying the SAE International J3016 to better characterize various agricultural operations such as tillage, spraying and harvesting. The ALAAM was classified into 6 levels from 0 (manual) to 5 (full automation) depending on the status of operator and autonomous system interventions for each item related to the automation of agricultural tasks such as straight-curve path driving, path-implement operation, operation-environmental awareness, error response, and task area planning. The core of the ALAAM classification is based on the relative roles between the operator and autonomous system for the automation of agricultural machines. The proposed ALAAM is expected to promote the establishment of a standard to classify the autonomous driving levels of self-propelled agricultural machinery.

• 대한인간공학회지
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• 제36권2호
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• pp.87-108
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• 2017

Objective: The purpose of this study was to precede the acceptance study based on automation steps and user experience that was lacked in the past study on the core technology of autonomous vehicle, ADAS. The first objective was to construct the acceptance model of ADAS technology that is the core technology, and draw factors that affect behavioral intention through user experience-based evaluation by applying driving simulator. The second one was to see the change of factors on automation step of autonomous vehicle through the UX/UA score. Background: The number of vehicles with the introduction of ADAS is increasing, and it caused change of interaction between vehicle and driver as automation is being developed on the particular drive factor. For this reason, it is becoming important to study the technology acceptance on how driver can actively accept giving up some parts of automated drive operation and handing over the authority to vehicle. Method: We organized the study model and items through literature investigation and the scenario according to the 4 stages of automation of autonomous vehicle, and preceded acceptance assessment using driving simulator. Total 68 men and woman were participated in this experiment. Results: We drew results of Performance Expectancy (PE), Social Influence (SI), Perceived Safety (PS), Anxiety (AX), Trust (T) and Affective Satisfaction (AS) as the factors that affect Behavioral Intention (BI). Also the drawn factors shows that UX/UA score has a significant difference statistically according to the automation steps of autonomous vehicle, and UX/UA tends to move up until the stage 2 of automation, and at stage 3 it goes down to the lowest level, and it increases a little or stays steady at stage 4. Conclusion and Application: First, we presented the acceptance model of ADAS that is the core technology of autonomous vehicle, and it could be the basis of the future acceptance study of the ADAS technology as it verifies through user experience-based assessment using driving simulator. Second, it could be helpful to the appropriate ADAS development in the future as drawing the change of factors and predicting the acceptance level according to the automation stages of autonomous vehicle through UX/UA score, and it could also grasp and avoid the problem that affect the acceptance level. It is possible to use these study results as tools to test validity of function before ADAS offering company launches the products. Also it will help to prevent the problems that could be caused when applying the autonomous vehicle technology, and to establish technology that is easily acceptable for drivers, so it will improve safety and convenience of drivers.

• 한국정보통신학회논문지
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• 제23권8호
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• pp.930-935
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• 2019

우리의 제안시스템인 mobiAutoBot은 모바일 장치를 지원 가능한 인지 자동화 수준의 로보틱스 프로세스 자동화 소프트웨어의 개념모델이다. mobiAutoBot은 mobiAutoBot controller와 mobiAutoBot runner의 두 부분으로 구성되어 있다. mobiAutoBot controller는 모바일기기에 Job을 지시하고 모니터링 및 연동작업을 수행하며, 모바일기기에 설치된 mobiAutoBot runner는 명령내린 작업을 수행한다. 우리가 제안한 mobiAutoBot을 통하여 모바일기기에 대한 자동화 기능을 중소기업에 제공한다면, 고가의 정보기반 인프라가 없더라도 단순 스마트폰과 같은 모바일기기만으로 기존 정보시스템과 연계 가능한 로보틱스 프로세스 자동화 기능을 저비용으로 구축할 수 있다. 우리의 제안은 모든 정보시스템 인프라를 갖추기는 어려운 중소기업이나 개인 사용자에게도 로보틱스 프로세스 자동화를 확산하는 계기가 될 것으로 기대한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 추계학술대회 논문집
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• pp.291-296
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• 2001

The computerized automation of modern manufacturing system is tremendously important for the cost reduction. Recently, the automation is being realized by Computer Integrated Manufacturing (CIM) concept and the unmanned factory is the final goal of the automation. The automation of the low level of factory is the most crucial and difficult aspect in total CIM environment since various machines are involved. A cell is defined as a manufacturing group of closely related machineries in the entire factory hierarchy, The management scheme for a cell controller is defined from the software viewpoint. The domain of a cell is designed with tasks(processes) in a multiple-task operating system. The operation of the cell is established by defining schemes for overall control of the cell domain, databases, job scheduling, communications within the domain, user-interface and communications with outside machines. Although the software is developed in a specific operating system and WINDOW facilities, the operating strategies can be applied globally.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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• pp.732-736
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• 2002

The introduction of newly developed intelligent and user-friendly robotics has opened a new era in shipbuilding. Together with traditional and low-cost mechanization a record level of welding automation rate has been achieved in the construction of cruise vessels. In the paper modem applications and recent developments of welding automation and robotics in shipbuilding have been described and some forecast for the future trends are given. Development in the field of shipyards will be continued with accelerated speed and we shall have interesting prospects for the near future. New laser techniques can boost the shipyards in a revolutional way when production is rapidly changing, materials will be lighter and quality demands are becoming more strict.

• International Journal of Control, Automation, and Systems
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• 제6권1호
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• pp.15-23
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• 2008

This paper considers the problem of delay-dependent guaranteed cost controller design for uncertain neutral systems with distributed delays. The system under consideration is subject to norm-bounded time-varying parametric uncertainty appearing in all the matrices of the state-space model. By constructing appropriate Lyapunov functionals and using matrix inequality techniques, a state feedback controller is designed such that the resulting closed-loop system is not only robustly stable but also guarantees an adequate level of performance for all admissible uncertainties. Furthermore, a convex optimization problem is introduced to minimize a specified cost bound. By matrix transformation techniques, the corresponding optimal guaranteed controller can be obtained by solving a linear matrix inequality. Finally, a simulation example is presented to demonstrate the effectiveness of the proposed approach.

• 대한토목학회논문집
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• 제33권3호
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• pp.1191-1202
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• 2013

기존의 토공 자동화 연구들은 주로 GPS와 센서의 응용, 작업환경 모델링, 장비 진로계획, 작업 정보관리, 원격조정 등과 같은 주제에 관심을 두었다. 최근에는 건설자동화 연구분야에서 $CO_2$ 감축이 주요 관심사의 하나로 대두되었다. 토공작업의 경우에는 많은 종류의 건설장비나 로봇들이 관여되므로 건설현장에서 많은 양의 $CO_2$를 배출하는 작업이 되고 있다. 효과적인 토공계획과 건설장비 운영은 생산성 및 안전성을 증가시킬 뿐만 아니라 $CO_2$ 배출량도 줄일 수 있다. 본 연구에서는 3D 토공현장 모델, 2가지 시공법에 의한 3D 토량배분 방법, 토공작업 패키지 구성방법과 같은 그린 토공을 위한 몇 가지 자동화 개념을 제시하고 있다. 엑셀로 작성된 시뮬레이터를 개발을 통하여 주어진 토공작업에 대하여 3D 토량배분 계획을 수립하였고 $CO_2$ 배출량을 추정하였다.