• 한국정밀공학회지
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• 제25권4호
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• pp.140-147
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• 2008

This paper represents an ultra precision rotational device where the smooth impact drive mechanism (SIDM) is utilized as driving mechanism. Linear motions of piezoelectric elements are converted to the rotational motion of disk by frictional forces generated between the rotational disk and the friction part that is attached to the piezoelectric element. This device was designed to drive the rotational disk using slip-slip motion mechanism instead of stick-slip motion mechanism occurred in conventional impact drive mechanism. Experimental results show that the angular velocity is increased in proportion to the magnitude and frequency of supplied voltage to piezoelectric element and decreased as the preload is increased. In our device, the smooth rotational motion was obtained when the driving frequency has been reached to 500Hz under the driving voltage of 100V.

• 대한한의학회지
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• 제26권2호
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• pp.126-139
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• 2005

Objective: This study was undertaken to examine the reliability of disease mechanism diagnosis, estimate the disease mechanism items of questionnaires and inquire about the relation of disease mechanisms to the oriental OB & GY diagnosis program. Questionnaires and abridged questionnaires were used for the object diagnosis of oriental medicine in the dept of Oriental OB & GY, Oriental Medical Hospital of Dong-Eui University. Methods: We analyzed the results of questionnaires about 1706 outpatients who had OB & GY disease in the Oriental Medical Hospital of Dong-Eui University from April 2000 to March 2004. Results: 1. The reliability of Oriental OB & GY questionnaires between $90\%$ and $95\%$ were 9 cases, between $85\%$ and $90\%$ were 3 cases, and under $85\%$were 3 cases. Abridged questionnaires were lower than original questionnaires, but 12 cases of a total 15 cases of disease mechanism were above $85\%$. Therefore, both abridged questionnaires and original questionnaires had similar results. 2. Abridged questionnaires were usually lower than existing questionnaires in the comparison of disease mechanism output frequency and that of disease mechanism average score. Therefore, the results of abridged questionnaires seemed to be poorer than those of existing questionnaires, but a great difference wasn't seen. 3. Disease mechanism that was over $50\%$ in the rate of pure question per disease mechanism was 10 cases $(66.7\%)$. Disease mechanism that contributed to producing disease mechanism result and in which pure question was over relevance calculation 0.9 was also 10 cases $(66.7\%)$. In abridged questionnaires, the duplication of questions per disease mechanism Was decreased, the rate of pure questions was increased, and the number of related disease mechanisms was decreased by abridgment of the questionnaires' questions. 4. The calculation of disease mechanism went with the increase of the duplication of questions in many cases, but Tam­Umhe, Kihe-Hyule, Kihe-Umhe, and Shin-Tam went with disease mechanism in many cases despite no duplication of questions. Conclusions: About the reliability of Oriental OB & GY questionnaires, 12 of a total 15 cases of disease mechanism were above $85\%$; therefore both abridged questionnaires and original questionnaires had similar results.

• 한국IT서비스학회지
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• 제15권2호
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• pp.125-155
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• 2016

By reclassifying and reinterpreting the factor variables that were used in precedent studies on company informatization by research theme and perspective on them success factor, the present study tried to examine how different the factor variables are in frequency of use and by period, and how importantly they were considered by research theme and perspective on its success factor, combining them with the studies done on mechanism point of view. The key findings of this study are as follows. First, it was found that the frequency of using mechanism variables, which are reclassified based on SER-M perspective, has gradually increased since 1990s. While the frequency of using resource factors sharply increased in 1990s, it decreased from 2000s. It indicates that more studies were conducted of mechanism factors other than resource factors from the early 2000s. Second, when looking at those variables reclassified by research them, it was found that such theme as decision maker, environment, and resource factors were more used than other research themes in the studies on the measuring factors of informatization. Mechanism factors turned out most used among overall research themes. In particular, they were more frequently used in studies related to the performance of informatization. This result evidences that mechanism-related variables are more importantly considered in the studies than other factors. This study produces a practical implication: what factors companies have to manage and secure intensively to attain successful informatization. In addition, this study helps companies seeking informatization understand and take advantage of SER-M factors on the basis of knowledge in the transitional process of the factor variables used in studies by period. It is expected that CIO can use the key findings of this study in monitoring the factors by the stage of informatization.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.447-450
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• 2003

In this research, we propose an automatic knowledge acquisition and composite knowledge expression mechanism based on machine learning and relational database. Most of traditional approaches to develop a knowledge base and inference engine of expert systems were based on IF-THEN rules, AND-OR graph, Semantic networks, and Frame separately. However, there are some limitations such as automatic knowledge acquisition, complicate knowledge expression, expansibility of knowledge base, speed of inference, and hierarchies among rules. To overcome these limitations, many of researchers tried to develop an automatic knowledge acquisition, composite knowledge expression, and fast inference method. As a result, the adaptability of the expert systems was improved rapidly. Nonetheless, they didn't suggest a hybrid and generalized solution to support the entire process of development of expert systems. Our proposed mechanism has five advantages empirically. First, it could extract the specific domain knowledge from incomplete database based on machine learning algorithm. Second, this mechanism could reduce the number of rules efficiently according to the rule extraction mechanism used in machine learning. Third, our proposed mechanism could expand the knowledge base unlimitedly by using relational database. Fourth, the backward inference engine developed in this study, could manipulate the knowledge base stored in relational database rapidly. Therefore, the speed of inference is faster than traditional text -oriented inference mechanism. Fifth, our composite knowledge expression mechanism could reflect the traditional knowledge expression method such as IF-THEN rules, AND-OR graph, and Relationship matrix simultaneously. To validate the inference ability of our system, a real data set was adopted from a clinical diagnosis classifying the dermatology disease.

• 대한기계학회논문집
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• 제9권4호
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• pp.528-538
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• 1985

본 논문에서는 crank-rocker 운동에 의해 함수 y=sinx를 만족시키는 3차원 R-S-S-R 함수발생기구를 FDP(Fletcher-Davidon-Powell) 최적화 기법을 응용, 운동학적 으로 무오차점을 고려, 설계하려고 한다. 한편 상기와 같이 최적 설계된 기구의 실 제 운동과 요구된 운동과의 오차분석 및 운동 가능성 여부(mobility check)를 검토하 였으며 FDP 최적화 기법에 필요한 벌칙함수(penalty function)로써 Fiacco-McCormic- krhk Powell의 벌칙함수를 사용하여 그 결과를 비교하였다.

• International Journal of Computer Science & Network Security
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• 제21권11호
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• pp.223-229
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• 2021

The presented research is devoted to determining the role of the mechanism of attracting investment resources in innovative development in the conditions of transformation using the process approach. It is proved that the process approach is dominant for this study because investments are considered as a process of investing in innovative development in the enterprise in the context of digitalization, and its application allows to take into account the impact on the mechanism of attracting investment resources. related to the mechanism of attracting investment resources of the enterprise. It is substantiated that the mechanism of attracting investment resources for innovative development in the context of digitalization is a specific way of organizing, mobilizing and using investment resources for innovative development of the enterprise in the context of digitalization under the influence of economic development laws, government regulation. The effectiveness of attracting investment resources in innovative development is ensured by the mechanism that exists in the enterprise. The mechanism of attraction of investment resources in innovative development in the conditions of digitalization gives the chance to define an optimum ratio between sources and volume of attraction of investments in innovation sphere.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1045-1049
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• 2005

In this paper, the dynamic crawling of a five-bar planar mechanism is investigated. One complete cycle of the crawling selected in this study consists of four different steps, i) sliding at one contact point between the mechanism and the ground, ii) changing its configuration without sliding at two contact points, iii) sliding at the other contact point, and iv) again changing its configuration without sliding at two contact points. In this type of crawling, the crawling mechanism maintains the shape of the parallel structure throughout a complete crawling cycle. The modeling algorithm for serial manipulators proposed by M. Thomas and et al.[1] is employed by introducing imaginary joints and links which represent the contact interfaces between the one end of the mechanism and the ground, while the other end of the mechanism is regarded as an end-effector of the imaginary serial manipulator which treats the reaction force and torque at the contact point as external forces. Then, a complete cycle of dynamic crawling of the mechanism is investigated through various computer simulations. The simulation result show that the stable crawling characteristics of the mechanism could be secured when the proper configurations depending on specified frictional constraints are met.

• 한국콘텐츠학회논문지
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• 제16권6호
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• pp.365-373
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• 2016

본 연구는 소매틱스(Somatics)를 발전시킨 무용 콘텐츠(Dance Contents)의 신경과학적 매커니즘(neuroscientific mechanism)을 문헌연구를 통해 밝히고자 하였다. 이에 따라 첫째, 소매틱스에서 사용하는 뇌과학적 매커니즘을 정리하고 둘째, 무용에서 활용되고 있는 소매틱스 훈련법을 통해 적용된 훈련법에 내포된 뇌과학적 메커니즘을 문헌연구를 통해 밝혀보았다. 본 연구에서는 소매틱스를 휄든크라이스(Feldenkrais)로 제한하여 신경가소성(neuroplasticity), 고유수용감각(proprioception), 감각통합(sensory integration)를 통해 작동원리를 설명할 수 있었다. 연구결과 가가(Gaga)와 타말파(Tamalpa)는 휄든크라이스의 주요기법인 움직임을 통한 자각(awareness thorough movement)을 수용하여 고유수용감각을 통해 받아들인 정보들을 통해 새로운 네트워크를 형성하고 감각통합을 하는 방식을 취하였다. 본 연구는 무용 훈련 안에서 일어난 뇌와 신체 간의 작용원리를 과학적으로 설명하고, 안무자, 무용가들이 자신의 무용연구 및 훈련에 이를 적용하고, 뇌과학적 관점에서 신체 움직임의 작동원리를 설명할 수 있는 밑거름을 제공하는데 그 의의가 있다.

• 인터넷정보학회논문지
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• 제11권2호
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• pp.85-98
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• 2010

최근 All-IP 네트워크 환경이 구축되면서 다양한 형태의 트래픽이 송수신되고 있으며, 이와 더불어 다양한 형태의 공격이 급증하고 있어 이에 대한 능동적 대응 방안이 제시되어야 한다. 기존 연구로는 SPIE 시스템 기반 해시 함수와 Bloom filter 방식을 적용한 라우터 중심 패킷 경로 역추적 기법이 제시되었으나, DDoS 공격이 발생 시 이를 능동적으로 차단하면서 공격 근원지를 역추적하기에는 문제점이 있다. 따라서 본 연구에서는 기존 SPIE 및 Sinkhole 기반 라우터 기법의 장단점에 대한 분석을 통해 두 방식의 장점을 결합하여 All-IP 네트워크 환경에 적합한 IP 역추적 방식을 설계하고 이를 구현하였다. 본 연구에서 제시한 기법은 기존의 Sinkhole 방식과 유사하게 공격 패킷에 대한 수집/모니터링 기능을 제공하면서도 역추적 패킷 Manager 시스템을 기반으로 공격 패킷에 대한 판단 및 수집/제어 할 수 있어 성능 향상과 함께 DDoS 공격에 대한 능동적 대응이 가능하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 춘계학술대회논문집
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• pp.384-388
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• 2004

This study presents parametric studies for design of tiling mechanism to be used in 180km/h tilting train. The titling mechanism is composed of 4 links, a tilting bolster and an electro-mechanical actuator. First we have determined the installation height of tilting actuator using 3D tilting bogie modeling. Secondary, we verified movements of the tiling center and train body CG along variation of upper and lower span length. From this study, we obtained the upper and lower span length to minimize the lateral and vertical motion of CG of train body. Finally, we evaluated the tilting actuator force and power required to tilt the train body to $\pm$8$^{\circ}$.