• 한국기계가공학회지
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• 제19권11호
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• pp.64-69
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• 2020

To determine the effective factors for microparticle blasting with precise sequence position control in the x-axis and y-axis directions, we conducted a statistical experimental analysis of blasted square shapes by considering five condition factors. The control input and output were operated simultaneously by rotation-linear motion conversion and fine particles were blasted onto the aluminum specimen by precise position control driving using multiple execution codes. The micro-driving device used for processing was capable of microparticle blasting and of controlling the system through contact with a limit sensor at high speed and a two-degree-of-freedom driving mechanism. Our experiments were conducted on 1,050 specimens of pure aluminum (containing <1% of other elements). The effects of several factors (e.g., particle and nozzle diameters, blasting pressure, and federate and blasting cycle numbers) on the surface roughness and blasted surface's depth were verified through a statistical experimental analysis by applying the dispersion analysis method. This statistical analysis revealed that the nozzle diameter, the blasting pressure, and the blasting cycle number were the dominant factors.

• 한국환경교육학회지:환경교육
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• 제19권3호
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• pp.57-66
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• 2006

This study is purposed to compose systematic and efficient curricula of the courses centered on the duties of forest interpreter. In the first step, the purpose of task analysis is to identify the forest interpreter's duties and tasks. 13 professional were designated as panel, and the task chart was completed via DACUM analysis. The tasks performed by forest interpreter are categorized in the development of specialty, program planning, comprehension on the engaged forest, program development, program execution and program evaluation, which are classified into 59 sub-tasks. In the second step, need analysis is focused on the evaluation of the degree of job importance, the necessity of education based on the results from the task analysis. In consequence, 23 key tasks are determined. In the third step, knowledge, skill, tool, and attitude required for key tasks were analyzed and reorganized into 23 subjects. This study has significance in 3 respects. Firstly, the tasks of forest interpreter are analyzed to define their roles. Secondly, the curricula composed according to the results of task analysis and need analysis allow the realizable and prerequisite subjects within the restricted resources. Finally, this study suggests the curriculum, which shall be the bases for the program planning and operation of a lot of educational organization and institutions.

• 한국기계가공학회지
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• 제19권8호
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• pp.81-87
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• 2020

A stable rotational-to-linear motion transformation structure using a driving mechanism with 2 degrees of freedom was developed for an orthogonal mechanism to prevent the interference of each axis in 2D motion. In this mechanism, a step motor was used for precise position control. This structure was developed to maneuver workparts in micro particle blast machining experiments. To determine the real-time performance of micro particle blast machining, the control, input, and output were operated simultaneously and precise position control was implemented, using a timer interrupt with multiple execution codes. The two step motors obtained precise position control by removing backlash with a ball-screw mechanism. The device has menu-type control codes for user-friendliness, and real-time sequence control was simultaneously adopted for user control input.

• The Journal of Korean Physical Therapy
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• 제32권2호
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• pp.70-74
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• 2020

Purpose: This study examined whether 1) the motor inhibition response as cognitive-behavioral component is learning though a stop signal task using stop-signal paradigm, and 2) whether there is a difference in the learning degree according to imagery training and actual practice training. Methods: Twenty young adults (males: 9, females: 11) volunteered to participate in this study, and were divided randomly into motor imagery training (IT, n=10) and practice training (PT, n=10) groups. The PT group performed an actual practice stop-signal task, while the IT group performed imagery training, which showed a stop-signal task on a monitor of a personal computer. The non-signal reaction time and stop-signal reaction time of both groups were assessed during the stop-signal task. Results: In the non-signal reaction time, there were no significant intra-group and inter-group differences between pre- and post-intervention in both groups (p>0.05). The stop-signal reaction time showed a significant difference in the PT group in the intra-group analysis (p<0.05). On the other hand, there was no significant intra-group difference in the IT group and inter-group difference between pre- and post-intervention (p>0.05). Conclusion: These results showed that the motor inhibition response could be learned through a stop-signal task. Moreover, these findings suggest that actual practice is a more effective method for learning the motor inhibition response.

• 한국멀티미디어학회논문지
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• 제2권3호
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• pp.297-307
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• 1999

다량의 문자가 온라인으로 실시간 입력되는 문자인식시스템에서는 영상의 전처리가 매우 신속하게 이루어 져야 한다. 또한 크기가 작거나 잡음을 포함하는 문자 영상에 대한 기하학적 정규화나 세선화 등의 영상 변환은 원영상의 정보 유실이나 왜곡을 유발하므로 최소화되어야 한다. 이에 따라 본 연구는 원영상을 변환하지 않은 상태에서 신속하게 인식에 효과적인 특정을 구하고자 하였다. 이를 위해 인식의 관점에서 의미를 가지는 윤곽화소를 정의하고 다양한 영상의 변화를 수용하는 효과적인 특징을 윤곽화소로부터 구하였다. 필기체 자모음과 자동차 번호판 숫자 인식 실험 결과, 제안된 방법이 기존의 방법보다 인식에 보다 효과적이었으며 한번의 영상 주사로 전처리를 완료하므로 소요 시간을 크게 줄일 수 있었다.

• 한국환경복원기술학회지
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• 제10권6호
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• pp.130-138
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• 2007

To protect the surface of ground-cutting slopes occurring at the national road substitute detour [roundabout road]construction jobsite between Munduk and Wubokgu within the jurisdiction of Pohang-si and environment-friendly road construction, a test execution of re-vegetation measures on the major slopes was done and the results are as follows : As a result of finding out the number of sprouting individuals on the test construction site, the average number of sprouting individuals on the three test spots by the method of revegetation measures D, revegetation measures A, and revegetation measures B was 1,292 number of per square meter, 1,190 number of per square meter, and 1,095 number of per square meter respectively, which statistics were higher than those of test spot by the revegetation measures C. As a result of finding out living plant's breeding index [weight in dried state], the average dried weight of living plant at the test spot by the method of revegetation measures B, in case of foreign herbal species, was the highest marking 8.96 grams per square meter, and the next was 6.86grams per square meter by the method of revegetation measures D, and the next after was 6.80 grams per square meter by the method of revegetation measures A, and the last 5.93 grams per square meter by the method of revegetation measures C. As a result of finding out the covering degree on the slopes, the same average covering degree of 80% and 77.5% in revegetation measures A and revegetation measures D individually, which showed a somewhat higher covering degree than those of revegetation measures B and revegetation measures C. As a result of finding out appearing plants on the test construction site, seeding plant life was found to be sprouting on all test spot while native and foreign herbal species and herbaceous plant as well as shrubs were growing in good harmony with each other. However, in case of revegetation measures B and revegetation measures C method, foreign plant species are dominantly growing. As a result of inspecting rifts on the slopes and the excavated state by water, there existed cracks in some of base materials only in revegetation measures C method applied spot.

• 한국ITS학회 논문지
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• 제11권2호
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• pp.67-76
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• 2012

본 연구에서는 본 학회지(제9권, 제5호 (2010년 10월))에서 발표한 교통약자보호시스템이 설치되어 있는 지역에 대한 어린이 지킴이 서비스 만족도 평가기준을 단순한 보호자 만족도 평가에서 벗어나 객관적인 구축평가 기준으로 정립하였다. 또한, 인식장치를 신규배치하기 위한 지역에 대해서는 사전 예측평가를 실시하여 인식장치 적정배치에 판단근거로 삼아 효율적 예산집행이 가능하도록 하였다. 시스템 구축평가에서는 가장 기본이 되는 최대 안심 거리는 72.2m로 나타났다. 이를 토대로 위험도개념을 도입하여 심리적위험도와 사고위험도를 종합한 위험도 순위에 따라 인식장치를 인식장치 배기거리에 맞게 배치하는 방식으로 향후 사업이 진행될 수 있도록 평가기준을 제시하였다. 평가기준에 의거 사례지역에 대한 종합위험도 평가결과 시범사업 후 종합위험도가 35.2% 감소한 것으로 평가되었다. 또한, 예산 규모 내에서 인식장치를 배치기준에 의해 설치할 경우 전체적으로 위험도가 33.1% 낮아져 예산규모는 당초 시범사업보다 21.9% 적게 투입하고도 종합위험도는 당초 시범사업의 94% 수준까지 낮출 수 있어 본 연구에서 정립한 위험도에 따른 인식장치 배치방법이 종합위험도 감소와 예산절감에 향후 효과적으로 적용될 수 있음을 알 수 있었다.

• 유통과학연구
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• 제13권5호
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• pp.91-102
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• 2015

Purpose - This study aims to build a systematic frame for effective marketing performances by prioritizing product type and pertinent channel that are appropriate for digital channel characteristics. FCB grid model was used to define a product type, and Internet communication satisfaction index was considered as a marketing performance measuring tool for digital channel. Research design, data, and methodology - As systematic understanding for Digital marketing is still unfamiliar to even professional marketer, the hypothesis was established based on preliminary research by conducting a qualitative survey of marketing experts who already experienced digital marketing in the fields as well as existing related study literature. Through a preliminary research, the degree for understanding for digital marketing, current digital marketing (including product/channel mix) execution status, and difficulties for marketers who had experienced digital marketing were figured out. Based on preliminary research, the main part of survey was designed to examine which type of product would be effective for digital marketing and which digital channel would be effective to achieve marketing performance in line with marketing objectives. To collect data, the questionnaire survey was conducted for professional marketers who had experienced digital marketing in 10 different fields including FMCG, cosmetics, distribution industry for one month (July, 10, 2014~Aug, 10, 2014). A total of 90 questionnaire were distributed and 66 questionnaires were used for the analysis, excluding the unanswered and insincere questionnaires. The data were analysed using SPSS ver.18.0. Results - The analysis for product type which is pertinent to digital marketing and prioritization for digital channel per digital marketing performance type could be summarized as followings. First, high involvement buying decision type of product and rational purchasing decision type of product in FCB grid are more effective for digital marketing in terms of marketing performance. Therefore, marketers in field would prioritize considering product type before executing digital marketing. Second, factor for sales increase, potential consumer creation and brand awareness was represented respectively 31.25%, 21.9%, and 20.8% as a result of factor analysis in terms of digital marketing channel performance. Third, effective major digital channel per digital marketing performance factor was differently identified as each digital channel has its own peculiarity. For instance, search engine is more effective for increasing sales while social media such as facebook and Kakaotalk is more effective for encouraging consumer participation. Conclusions - As a result of this study, product type and peculiarity which were pertinently fit to digital marketing were identified by using FCB grid model, and also suggested framework for decision making of digital channel selection in line with marketing objectives for effective marketing performance. It also provided insight to professional marketer which type of product could be effective for digital marketing execution as well as which factors should be measured for digital marketing performance.

• 한국전자거래학회지
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• 제10권1호
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• pp.61-80
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• 2005

업무프로세스관리(BPM) 시스템은 업무프로세스의 효율적인 실행, 통제 및 관리를 지원하는 소프트웨어 시스템으로서, 복잡한 프로세스를 자동화하고, 이를 효과적으로 관리하여 기업의 생산성 향상에 기여한다. 그러나, 상용시스템은 주로 프로세스의 자동화에 초점을 두고 있어 프로세스와 업무참여자 관점에서 효율적인 관리 방법을 제공하지 못하고 있다. 따라서, BPM 시스템은 프로세스 참여자와 전체 프로세스 효율성 향상의 관점에서 개선의 여지가 있다. 이에 본 논문에서는 업무프로세스를 보다 효율적으로 관리하는 새로운 방법을 제안한다. 제안한 방법은 업무참여자의 업무부하를 고려하여 전체 프로세스를 실행하는 방식으로서, 프로세스 참여자원 가운데 가장 큰 제약요소를 집중관리한다. 이러한 방식은 경영혁신이론으로 알려진 제약이론(Theory of Constraints)의 DBR (Drum-Buffer-Rope) 방법론을 기반으로 하고 있다. DBR 방법론을 활용하기 위해 우선, 업무프로세스와 DBR의 주적용모델의 차이점을 분석하고 업무프로세스에 적합한 드럼, 버퍼, 로프를 개발한다. 이를 토대로, 업무참여자의 업무부하와 프로세스 인스턴스 발생 패턴을 통제하는 BPM만의 DBR 방법론(BP-DBR, Business Process-DBR)을 제안한다. BP-DBR은 업무참여자의 업무환경과 전체프로세스의 효율성 개선에 기여할 것으로 기대한다. 이러한 기대효과를 증명하기 위해 기존 BPM의 프로세스 관리방법과 제안한 방법의 효과를 시뮬레이션 실험을 통해 비교한다.

• 한국정보처리학회논문지
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• 제6권12호
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• pp.3447-3455
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• 1999

데이터베이스 기술의 적용분야가 점차 확대되어감에 따라 작업처리율을 증대시키기 위한 다양한 형태의 거래 처리 모형들을 필요로 하는 추세이다. 그러나 기존의 syntax위주의 직렬성 이론만 가지고서는 거래의 실행시간상 차별화 특성을 수용하면서 다수의 거래에 대한 단위시간당 처리 생산성을 높이기는 힘든 형편이다. 이러한 상황을 해결하기 위하여 이타적 잠금기법(altruistic locking: AL)은 거래가 객체를 사용한 다음 더이상 그 객체를 요구하지 않을 때 다른 거래들이 그 객체를 로크할 수 있도록 미리 객체에 대한 로크를 해제함으로써 거래들의 대기시간을 줄이기 위한 취지에서 제안된 것이다. 확장형 이타적 잠금(extended altruistic locking: XAL)기법은 AL을 자취의 확장 측면에서 개선한 잠금기법으로서 AL이 근본적으로 안고 있는 반드시 기부된 객체만을 처리해야 한다는 부담을 보다 완화한 기법이다. 본 논문에서는 우선 장기거래로 인한 단기거래의 장기적 대기현상 완화 측면에서의 AL과 XAL의 공통적 한계점을 분석하였다. 분산 환경하에서 장기거래로 인한 단기거래의 장기적 대기현상을 최소화하도록 줄임으로써 동시성 제어의 정도를 높이는 반면, 거래간의 평균 대기시간을 줄일 수 있는 새로운 확장형 이타적 잠금기법인 전후진방식의 신형 확장 기법인 2DL(two-way donation locking)을 제안하였다. 기법의 적용 광범위성을 위해 분산 계산 환경에서도 작동될 수 있게끔 설계하였다. 모의실험에 의한 성능평가 결과 장기거래의 길이가 5이상, 9이하인 상황에서 2DL은 2PL보다 작업 처리율과 거래의 평균 대기시간 면에서 우수한 결과를 나타내었다.