• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.8-13
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• 1993

This paper presents deterministic and adaptive control laws for two-link flexible arm. The flexible arm has considerable structural flexibility. Because of its flexbility, dynamic equations are very complex and difficult to get, dynamic equations for two-link flexible arm are derived from Bernoulli-Euler beam theory and Lagrangian equation. Using the fact that matrix is skew symmetric, controllers which have a simplified structure with less computational burden are proposed by using Lyapunov stability theory.

• 한국실내디자인학회논문집
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• 제13호
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• pp.174-180
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• 1997

This study is on the spacial flexbility of house. In the recent days, it is true that the qualitative aspect of residence rather than the quantitative one has emphasized. But the inhabitants of residence undergo adaptation problems to deal with changing needs constantly. Residence must be the place to satisfy inhabitant's desire to live and dwell. According to changes in family life cylce and personal demand, the flexibility in housing should be beneficial. This study attempts to solve relationships of these need changes and inhabitant's adaptation through the spatial flexibility. Throughout the process of main discourse, some theoretical backgrounds of housing are applied. And to introduce the flexibility of residential space, concepts of flexibility according to 'time' and 'spatial structure' are employed. In addition to functionality and comfort, living should provide a touch of humanity attuned to individual sensibilities. The purpose of this study is to suggest a method can move interior structure by the flexible planning.

• 한국조명전기설비학회지:조명전기설비
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• 제10권6호
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• pp.81-87
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• 1996

본 논문은 SRM 의 가변속 구동을 위한 디지털 방식 인버터에 관한 연구이다. 전동기의 속도제어를 위해 고정스위치각과 가변전압제어방식을 사용하였으며 이는 평탄 상전류를 얻어 토오크 맥동을 저감하고 상제어를 위한 위상각 제어를 하지 않아 제어시스템을 단순하게하는 장점을 가진다. 8097마이크로콘트롤러를 이용하여 제어시스템을 디지털화, 소형화하고 제어의 유연성을 높였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 추계학술대회 논문집 학회본부
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• pp.642-645
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• 1997

This paper presents a propulsion control system for electric car to improve traction capability. The presented VVVF inverter was composed of as IGBT and the controller was full digitalized by using 32bit DSP. The improved PWM algorithms was adapted to improve traction characteristics. The system could be possible the higher reliablity, compact, light, low cost' and flexbility.

• 한국경영과학회지
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• 제25권1호
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• pp.51-65
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• 2000

Multiple U-typed producton lines are increasingly accepted in modern marufacturing system for the flexbility to adjust to changes in demand. This paper considers multiple U line balancing with the objective of minimizing cycle time considering the moving time of workforce given the number of workstation. Like the traditional line balancing problem this problem is NP-hard. In this paper, we show how genetic algorithm can be used to solve multiple U line balancing problem. For this, an encoding and a decoding method suitable to the problem are presented. Proper genetic operators are also employed. Extensive computational experiments are carried out to show the performance of the performance of the purposed algorithm. The computational results show that the algorithm is promising in solution quality.

• 한국실내디자인학회논문집
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• 제16호
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• pp.29-35
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• 1998

The purpose of this study is to analyze the elements forming interior design and to examine dimensional relationship among the elements which form space through the comparison of the spatial language and semiotics of space for the component of interior design. In addition to that it indtends to derive the principle of design which dominate interior design and the inherent diversified meaning by comparing those elements with the square of semiotic used in semiotics. Through this comparsion the meaning of constituent forming space which can be observed through the comparsion of square of semiotic has redefined flexbility among relational system of elements and this flexible concept make the scope of environment including human being broad and enriched. This study fist of all analyzes various phenomena of social culture review semiotics meta-learning and examines back theoretical ground of semiotics which is needed for space analysis. Second of all in the area of presenting an analysis tool for meaningful analysis this report introduces the square of semiotics which was invented,. A. J. Greimas in order to analyze the meaning of literary work and defind three categories of the progressive research method for the analysis of interior design and research itself. Finally as for the analysis of meaning for interior design this report sets the space and analyzed the space in accordance with the method and research procedure. being

• 한국직업건강간호학회지
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• 제7권2호
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• pp.155-163
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• 1998

In order to investigate the effects of rotating shift work on the subjective characteristics of sleep and mental depression questionnaire survey was carried out on 405 shift workers and 153 nonshift workers who were nurses employed. in three university hospital. The questionnaire forms used in this study were the self rating depression scale(SDS) and circadian type questionnaire(CTQ) factor R(rigidity/flexbility of sleeping habit) and factor V(inability/ability to overcome drowsiness). The results were as follows ; 1. Mean score of CTQ R in shift workers was significantly lower than that in nonshift workers, however, no significant difference in CTQ V was observed between two groups. 2. Mean score of SDS was significantly higher in shift workers(44.1) than in nonshift workers(39.8). 3. Mean self rating depression scale scores of pervasive affect, physiologic equivalents and psychological equivalents were significantly higher in shift workers than in nonshift workers. 4. In shift worker, mean SDS score was the highest in confusion and followed by diurnal variation, retardation, and indeciveness in the descending order. In nonshift worker, that score was the highest in decreased libido and followed by confusion, and indeciveness in the descending order. 5. Circadian type questionnaire scores was significantly and negatively correlated with significantly and negatively correlating with Self-rating depression scale scores(r=-0.473).

• Smart Structures and Systems
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• 제5권3호
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• pp.291-316
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• 2009

Damage detection using structural classical deflection flexibility has received considerable attention due to the unique features of the flexibility in the last two decades. However, for relatively complex structures, most methods based on classical deflection flexibility fail to locate damage sites to the exact members. In this study, for structures whose members are dominated by axial forces, such as truss structures, a more feasible flexibility for damage detection is proposed, which is called the Axial Strain (AS) flexibility. It is synthesized from measured modal frequencies and axial strain mode shapes which are expressed in terms of translational mode shapes. A damage indicator based on AS flexibility is proposed. In addition, how to integrate the AS flexibility into the Damage Location Vector (DLV) approach (Bernal and Gunes 2004) to improve its performance of damage localization is presented. The methods based on AS flexbility localize multiple damages to the exact members and they are suitable for the cases where the baseline data of the intact structure is not available. The proposed methods are demonstrated by numerical simulations of a 14-bay planar truss and a five-story steel frame and experiments on a five-story steel frame.

• 한국정보처리학회논문지
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• 제7권10호
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• pp.3247-3261
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• 2000

하드웨어와 소프트웨어의 통합 설계 방법을 사용하면 다양한 신호처리 시스템을 설계 시간 및 비용에 있어서 효율적으로 구축 할 수 있다. 기존에 연구된 C로 구현된 다양한 신호 처리 시스템을 통합 설계 환경에서 효과적으로 활용하기 위하여 C로 구현된 알고리즘을 하드웨어 설계 언어(VHDL)로 변환할 필요성이 있다. C를 VHDL로 변환하는 경우 특히 동적 할당, 포인터, 재귀 호출 구문의 변환이 용이하지 않다. 본 논문에서는, 현재까지 소프트웨어로 구현되어 왔던 재귀 호출문을 동적 구조를 활용하여 VHDL 구문으로 변환하는 방법론을 제시하고자 한다. 이를 통해 통합 설계의 하드웨어 소프트웨어 분할시 유연성을 부여할 수 있고, 통합 설계의 궁극적인 목표인 시스템의 전체적인 성능 향상과 설계 시간 단축으로 우수한 목적 시스템을 구축할 수 있을 것으로 기대된다.

• 아태비즈니스연구
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• 제13권3호
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• pp.493-504
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• 2022

Purpose - This study investigate the effect of innovative capacity on corporate export performance and moderating flexibility. Design/methodology/approach - For this, hypotheses were established by reviewing previous studies and an empirical analysis was conducted for testing. Using SPSS 22.0, a frequency analysis of related variables was conducted. Through an exploratory factor analysis, validity and reliability tests of measuring tools were conducted and a descriptive statistics was analyzed for collected data result and hypotheses testing. Findings - Finally, with a verified model, the hypotheses and the moderating effects were tested. The results are as follows; The innovationa capacities have a positive effect on export performance and flexibility However, the flexbilitiy was not moderator in the relationship between innovative capacity and export performance. Research implications or Originality - According to the results above, this study presents directions to improve export performance of technological innovative type SMEs. The innovative capabilities, marketing capacity, organization innovative capacity and process innovative capactity, has an positive effect on