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- 저자 : 이기훈(Ki-Hoon Lee) (검색결과 197 건)
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적응 칼만필터를 이용한 고가속 GPS 수신기의 항법정확도 향상
이기훈,이태규,송기원,Lee, Ki-Hoon,Lee, Tae-Gyoo,Song, Ki-Won 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.1
An adaptive Kalman filter is designed as a post-navigation filter to improve the accuracy of GPS receiver's navigation performance in high dynamic environments. Not only the adaptive Kalman filter reduces the large noise error of navigation data which is obtained by least square method, but also the filter is not degraded as normal Kalman filter in high acceleration movements because the system noise is estimated. Also an initialization structure of the filter is desisted in consideration for irregular output condition of navigation data by least squared method such as reacquisition status in GPS receiver. The filter performance is verified by GPS simulator which has the simulation capability of high velocity and acceleration. Finally, a vehicle test including DGPS is executed to conform the real improvement of that filter performance. This filter can be applied to various data measurement systems to improve accuracy in high dynamic conditions besides GPS receiver.
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강의평가의 타당성과 신뢰성에 관한 연구 전주대학교 강의평가 결과를 중심으로
이기훈,Lee, Ki-Hoon 한국데이터정보과학회 2010 한국데이터정보과학회지 Vol.21 No.1
본 논문은 강의평가의 타당성과 신뢰성을 측정하는 방법을 소개하고 실제자료를 이용하여 타당성과 신뢰성을 평가하였다. 기존의 강의평가 관련논문이 강의평가에 미치는 외생적인 영향을 통제하는 데 주력한 데 반해, 교원의 신분에 직접적인 영향을 미칠 수 있는 중대한 강의평가가 과연 믿을 만한 평가인가에 관한 근원적인 질문에 답하려 하였다. 전주대학교의 강의평가 결과를 실증 분석한 결과 타당성과 신뢰성 면에서 어느 정도 만족할 만한 수준임을 확인할 수 있었다. 본 논문에서는 기존에 간편하게 사용되던 신뢰성 측도가 아닌 일반화가능도 계수를 이용하여 신뢰성을 평가하는 방법을 자세히 소개하고 그 장점을 설명하였다.
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소스 및 드레인 전극 재료에 따른 비정질 InGaZnO 박막 트랜지스터의 소자 열화
이기훈,강태곤,이규연,박종태,Lee, Ki Hoon,Kang, Tae Gon,Lee, Kyu Yeon,Park, Jong Tae 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.1
In this work, InGaZnO thin film transistors with Ni, Al and ITO source and drain electrode materials were fabricated to analyze a hot carrier induced device degradation according to the electrode materials. From the electrical measurement results with electrode materials, Ni device shows the best electrical performances in terms of mobility, subthreshold swing, and $I_{ON}/I_{OFF}$. From the measurement results on the device degradation with source and drain electrode materials, Al device shows the worst device degradation. The threshold voltage shifts with different channel widths and stress drain voltages were measured to analyze a hot carrier induced device degradation mechanism. Hot carrier induced device degradation became more significant with increase of channel widths and stress drain voltages. From the results, we found that a hot carrier induced device degradation in InGaZnO thin film transistors was occurred with a combination of large channel electric field and Joule heating effects.
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생물자원 전통지식 추출을 위한 델파이조사의 신뢰성 연구
이기훈,송미장,김현,Lee, Ki Hoon,Song, Mi-Jang,Kim, Hyun 한국데이터정보과학회 2015 한국데이터정보과학회지 Vol.26 No.4
In the knowledge and information age, to discover and protect Intellectual Properties would be very important for their economic value as a major growth engine. This study evaluated the reliability of a Delphi survey conducted by experts to assess the value of agricultural resources knowledge obtained from literature reviews and field interviews. Delphi method is collecting the opinions of experts for several rounds repeatedly, in the next round the experts have chance to modify their opinion. Scores between two rounds are highly correlated and standard deviations are declined for second round to imply that some correction of their evaluations are made. To check reliability of Delphi survey of two rounds Cronbach's reliability coefficient and Generalizability coefficient are derived. The Cronbach alpha's supported the reliability of the method, but the Generalizability analysis revealed some unexpected results while checking the variance components of sources of measurement errors. Despite the increased reliability coefficients, the deviations between the raters are increased which means that additional rounds are required to get consensus, the goal of Delphi research.
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방풍통성산(防風通聖散)으로 치료한 소아 건선(乾癬) 3례
이기훈,장규태,Lee, Ki-Hoon,Chang, Gyu-Tae 대한한방소아과학회 2009 대한한방소아과학회지 Vol.23 No.3
Objectives The purpose of these 3 cases study is to report the effects of psoriasis children treated by oriental medicine. Methods The subjects are 3 children diagnosed as having psoriasis. These patients were treated by oriental herbal medicine(Bangpungtongsungsan). We observed the improvement of skin condition by Psoriasis Area and Severity Index(PASI) score. Results After treatment, the symptoms of psoriasis were relieved. PASI score of three children in psoriasis was respectively changed from 7 to 0, 2.4 to 0, 3.6 to 0. Conclusions This study shows that Bangpungtongsungsan can be an effective treatment for psoriasis. Further study in needed with more cases of treatment.
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이기훈,양지은,장규태,Lee, Ki-Hoon,Yang, Ji-Eun,Gyu-Tae, Chang 대한한방안이비인후피부과학회 2015 한방안이비인후피부과학회지 Vol.28 No.4
Objectives : The purpose of this study is to present two case reports on the treatments of psoriasis who has functional gastrointestinal disorder.Methods : We administered herbal medicine to two patients who showed psoriasis with functional gastrointestinal disorder and evaluated the results by Psoriasis Area and Severity Index(PASI).Results : After the treatment two patients showed improvements in PASI. PASI of patient 1 changed from 8.8 to 0.8; patient 2 from 7.0 to 0.2Conclusions : The results suggest that herbal medicine can be an effective treatment for psoriasis who has functional gastrointestinal disorder.
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이기훈,Lee, Ki-Hoon 한국통계학회 2008 Communications for statistical applications and me Vol.15 No.3
The sample size in a clinical trial is determined by the hypothesis, the variance of observations, the effect size, the power and the significance level. Dropouts in clinical trials are inevitable, so we need to consider dropouts on the determination of sample size. It is common that some proportion corresponding to the expected dropout rate would be added to the sample size calculated from a mathematical equation. This paper proposes new equations for calculating sample size dealing with dropouts. Since we observe data longitudinally in most clinical trials, we can use a last observation to impute for missing one in the intention to treat (ITT) trials, and this technique is called last observation carried forward(LOCF). But LOCF might make deviations on the assumed variance and effect size, so that we could not guarantee the power of test with the sample size obtained from the existing equation. This study suggests the formulas for sample size involving information about dropouts and shows the properties of the proposed method in testing equality of means.
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이기훈 ( Ki Hoon Lee ) 한국중문학회 2010 중국문학연구 Vol.40 No.-
該文將從漢代到淸代的≪國語≫注釋本鉤稽而整理的. 幷且經目錄整理試圖分別類型. 其結果, 可以獲得歷代≪國語≫注釋本八十一種. 這是比目前最后製作的日人大野峻<≪國語≫の硏究書>目錄還多二十六種. 注釋本之類型分爲四種. 因爲現在≪國語≫注釋本不都是尙存, 所以由題名、序文等基礎內容而判斷其類型. 四種類型大槪如下: 第一, 能說最普遍的、傳統的工作方法, 就是字句內容上註疏的. 第二, 關于≪國語≫思想內容提示意見的. 第三, ≪國語≫之字句發音上註音的. 第四, 設定特殊項目而做索引的. 從此, 我們可知歷代文人對≪國語≫有多大興趣, 同時能瞭解古人硏究文獻的方法多有豊富. 像本文這種目錄工程向后能活用于各種方面. 比如, 從歷代≪國語≫注釋本的特征和發展過程可以考察對≪國語≫之文人認識變化. 又從索引注釋可以把握古人用나種項目分析文獻等. 本文由于時空間的限制還留着흔多不足之處, 卽部分注釋本只察看所藏與否, 還沒確認其具體板本. 此后博士后硏修過程其間內要進行當地調査而完整一些.
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