• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.12a
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• pp.80-83
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• 2002

정밀한 서보기술에 바탕을 두고 있는 산업용 로봇 팔은 기계적인 강성도와 서보기구들로 인하여 정확한 제어가 가능하다 그러나 로봇팔은 동작중비 관성모멘트의 변화와 기하학적인 구조로 인하여 비선형적인 시스템이다. 특히 관성모멘트의 변화는 로봇팔의 회전속도와 로봇팔이 이동시키는 대상물의 무게 등에 따라 관성모멘트는 변할 수 있다. 이로 인하여 관성모멘트의 변화에 따라 로봇팔의 정확한 위치제어가 힘들어진다. 따라서 본 논문에서는 관성모멘트의 변화에도 불구하고 강인한 응답특성을 나타내는 제어기의 설계가 요구된다. 일반적으로 PID .제어기는 설계의 용이성으로 산업현장에서 널리 사용된다. 그러나 PIB 제어기의 각 계수값을 설정하는데 많은 어려움이 발생한다. 따라서 본 논문에서는 PID 제어기의 각 계수 값을 퍼지알고리즘을 이용하여 자동으로 설계할 수 있는 자기동조 PID 제어기를 설계한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.1
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• pp.101-105
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• 2002

In this paper, the coupling windows of the dielectric resonator filter have been analyzed. The coupling factor which has been used to characterize the coupling window is represented by closed form expressions. The deviation of the coupling factor as the size of coupling window has been compared between calculated by presented method and measured ones. There are very closed agreements. The presented method can be applied not only to design dielectric resonator but also to design varactor tuned dielectric resonator filter so as that the passband bandwidth is constant within tuned ranges.

• The Journal of Korean Society for Radiation Therapy
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• v.27 no.1
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• pp.23-30
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• 2015

Purpose : External markers respiratory movement measuring device (RPM; Real-time Position Management, Varian Medical System, USA) Liver Cancer Radiation Therapy Respiratory gated with respiratory signal with irradiation time and the actual research by analyzing the respiratory phase with the breathing motion measurement device respiratory tuning evaluate the accuracy of radiation therapy Materials and Methods : May-September 2014 Novalis Tx. (Varian Medical System, USA) and liver cancer radiotherapy using respiratory gated RPM (Duty Cycle 20%, Gating window 40% ~ 60%) of 16 patients who underwent total when recording the analyzed respiratory movement. After the breathing motion of the external markers recorded on the RPM was reconstructed by breathing through the acts phase analysis, for Beam-on Time and Duty Cycle recorded by using the reconstructed phase breathing breathing with RPM gated the prediction accuracy of the radiation treatment analysis and analyzed the correlation between prediction accuracy and Duty Cycle in accordance with the reproducibility of the respiratory movement. Results : Treatment of 16 patients with respiratory cycle during the actual treatment plan was analyzed with an average difference -0.03 seconds (range -0.50 seconds to 0.09 seconds) could not be confirmed statistically significant difference between the two breathing (p = 0.472). The average respiratory period when treatment is 4.02 sec (${\pm}0.71sec$), the average value of the respiratory cycle of the treatment was characterized by a standard deviation 7.43% (range 2.57 to 19.20%). Duty Cycle is that the actual average 16.05% (range 13.78 to 17.41%), average 56.05 got through the acts of the show and then analyzed% (range 39.23 to 75.10%) is planned in respiratory research phase (40% to 60%) in was confirmed. The investigation on the correlation between the ratio Duty Cycle and planned respiratory phase and the standard deviation of the respiratory cycle was analyzed in each -0.156 (p = 0.282) and -0.385 (p = 0.070). Conclusion : This study is to analyze the acts after the breathing motion of the external markers recorded during the actual treatment was confirmed in a reproducible ratios of actual treatment of breathing motion during treatment, and Duty Cycle, planned respiratory gated window. Minimizing an error of the treatment plan using 4DCT and enhance the respiratory training and respiratory signal monitoring for effective treatment it is determined to be necessary.

• Journal of Korean Home Economics Education Association
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• v.21 no.3
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• pp.65-81
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• 2009

The purpose of this thesis was to analyze shopping orientations of adolescence and to understand the reasons of their dissatisfactions in purchasing garments at so-called internet malls. This study was to provide basic information helpful in clothing study by finding out dissatisfactory factors of adolescence purchasing clothes through internet malls. This survey was done among 273 students of 3 junior-high schools and 3 high schools within the boundary of Seoul and its suburb area, among which 265 of them were qualified as legitimate survey. The results were as follows. First, the youth shopping trends were divided into the 5 categories according to the basic trends. And the 5 categories were 'Convenience seeking', 'Peer-assimilating', 'Personality/trend worshipping', 'Passive and inactive', and 'Thrifty' The survey represented that girls showed higher garment assimilating rate and made better economic choices than boys did. The survey also showed that the highschool students used internet shopping mall in order to seek better prices. furthermore, the primary targets of the juvenile internet shopping were shoes and garments, which includes both upper and lower clothing. Second, The dissatisfaction factors of internet shopping were the 'Mismatch of the goods in the screen and those of the real life', 'Exchange/Refund', 'Qualify', 'Desigin and color', 'Shipping', and 'Size' in order of biggest to the smallest. The dissatisfaction rate was higher among the groups of 'Thrifty', 'Personality/Trend worshipping', 'Convenience seeking', girls and highschool goers.

• The Korean Journal of Applied Statistics
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• v.23 no.3
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• pp.443-456
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• 2010

This study is an empirical research of the stock markets to prove the synchronization phenomenon of the world economy. For this research I analyzed Korea's KOSPI, USA's DOW & NASDAQ reflecting stock markets in North America, Japan's NIKKEI in Asia, and Germany's DAX in Europe. Because the raw series are not stationary, they are to be transformed to returns series. The results of the study are follows: First of all, there are significant causalities between KOSPI's returns and those of other indices. Second, feedback effects are found between the market returns with several time lags. Third, there are 4 cointegrating equations which embody the relation of the five returns series. And forth, KOSPI reacts more sensitively to impacts from the foreign indices compared to the other indices do when they got impacts from each other except KOSPI. On conclusion, there exists a clear evidence for the synchronization phenomenon in returns of the stock indices, and we can expect Korea market may get similar changes depending on the economic changes of North America, Europe, or Asia. Therefore more closing researches should be conducted about the world economy synchronization in various fields as soon as possible.

• Journal of Korean Home Economics Education Association
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• v.17 no.3 s.37
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• pp.97-108
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• 2005

The purposes of this study were to 1) examine the tendency of elementary school students' self-esteem and clothing behavior, 2) find out the difference in their clothing behavior in accordance with the demographic characteristics and the level of their self-esteem, and 3) analyze the relationship between self-esteem and clothing behavior. This process was to understand the clothing behavior of elementary school students and to provide basic data needed for a desirable clothing life education for them. The subjects of this study were 403male and female fifth and sixth graders from elementary schools located in Suwon, Gyeonggi-do. The results of this study were as follows : First, elementary school students' self-esteem and clothing behavior were found to be in the mid-level. The sub-factors of clothing behavior were indicated in the order of clothing independence, clothing comfort, clothing management, clothing interest and clothing conformity. Second, there were differences in clothing behavior in accordance with the demographic characteristics and the level of their self-esteem. Female students had higher level of clothing conformity, clothing interest and clothing management than male students, while males had higher clothing comfort than females. Fifth graders, compared to sixth graders, had higher clothing management and lower clothing independence. Students who received \20,000 or more allowance a month had higher clothing conformity and clothing interest, and lower clothing comfort. Higher clothing interest was found when students had jobless mothers. The higher the students' self-esteem was, the higher their clothing management level was. Finally, elementary school students' self-esteem was found to have a positive relationship with clothing management. In other words, elementary school students with higher self-esteem manage their clothes better.

• Proceedings of the Materials Research Society of Korea Conference
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• 2007.11a
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• pp.82.1-82.1
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• 2007

• Journal of the KSME
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• v.55 no.4
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• pp.43-47
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• 2015

이 글에서는 쌍안정 진동형 에너지 하베스터에 대한 필요성과 유용성 및 이의 동적 특성을 소개하고, 쌍안정 특성을 이용하여 넓은 영역의 주파수 성분에 대해 동조 가능하도록 하는 주파수 광대역화 기술에 대해 설명하고자 한다.

• Proceedings of the Costume Culture Conference
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• 2003.09a
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• pp.68-69
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• 2003

현대인은 복식활동에서 개성이 강하게 표현되기를 원하며 웨딩드레스에서도 차별화 된 다양한 디자인을 요구한다. 복식의 한 분야인 웨딩드레스는 복식의 흐름에 동조하면서, 디자인 개발보다는 복식사적 틀 속에서 재현되어 왔다. 본 연구에서는 신부들의 개성과 다양한 요구에 부응할 수 있는 디자인 개발과 표면적인 재질감의 표현에 있어 예술성 및 가치부여를 비즈장식 기법을 응용한 웨딩드레스와 웨딩예복을 개발하는데 목적이 있다. (중략)

• The Journal of the Korea Contents Association
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• v.14 no.4
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• pp.445-455
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• 2014

The purpose of this study is to examine what variables influence on teenagers' exposure to sexual content on their smartphone. For this, the present research used demographics, self-control, parental monitoring, conformity to peer groups, sensation seeking, differential association and media use as independent variables and applied survey method based on 449 teenagers. Main findings are as follows. First, male and high school students who have high school graduated father exposed to sexual content more, and the lower self-control and higher conformity to peer groups and differential association, the more exposed to sexual content. Second, male and high school students were intentionally exposing to sexual content more, and the lower self-control and higher differential association, the more intentionally exposing to sexual content.