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      • KCI등재
      • KCI등재

        60M급 쌍동형 카페리 구조 엔지니어링 고찰

        이정호,김인철,서광철,Lee, Jung-Ho,Kim, In-Chul,Seo, Kwang-Chul 해양환경안전학회 2017 海洋環境安全學會誌 Vol.23 No.5

        본 논문에서는 쌍동형 카페리에 대한 기본구조설계 및 구조해석을 위한 기법을 제시한다. 카페리와 같이 길이가 50미터 이상이고, 길이/폭의 비가 12보다 큰 중/소형 고속선박의 강도해석에 대한 규정이나 방법론은 아직까지 명확하게 제시되지 않고 있다. 따라서 본 논문에서는 한국선급 규정을 이용하여 부재 스캔틀링을 수행하였고, 설계안에 대한 구조강도 검증을 위해서 카페리 전용선박 기준을 추가적으로 적용하여 검토하였다. 특히, 카페리 전용선박 기준을 이용하여, 선체거더 최종강도를 추가적으로 수행하였으며, 기존 기준에 의한 설계의 모호성을 극복하도록 제안하였다. 본 연구를 통해 도출된 연구 결과는 앞으로 고속 쌍동형 카페리의 구조설계 및 구조해석에 관련된 기본적인 자료로 유용하게 활용될 것으로 예상되며, 현재 설계된 쌍동형 카페리의 부재 치수는 한국선급 기준에 충분히 만족하면서 구조적으로 안전하다. This paper suggests study of basic structure design and structural analysis for the twin car-ferries. The rules and methodology for the strength analysis of medium and small sized high speed vessels with a length of more than 50m and a length/width ratio of more than 12, such as car-ferries, have not been clarified yet. Therefore, in this paper, the members scantling were carried out using the KR Rule, and the car-ferry exclusive vessel standard were further applied to verify the structural strength the design. The scantling of the members is based on the Korea Classification standards, and the car-ferries standards were additionally applied to verify the structural strength of the design. Especially, the ultimate strength of hull girder was additionally carried out by using car-ferry exclusive vessel standard, and proposed to overcome ambiguity of design by existing standard. The results of this study are expected to be useful as basic data related to structural design and structural analysis of high speed twin-hull car-ferries. The present car-ferry design has a sufficient safety margin in strength point of view according to the KR rule.

      • KCI등재후보

        The Comparison of Central and Mean True-Net Power (Pentacam) in Calculating IOL-Power After Refractive Surgery

        이정호,신주연,하병진,김상우,조범진,김응권,김태임 대한안과학회 2009 Korean Journal of Ophthalmology Vol.23 No.1

        Purpose: To compare the accuracy of central true net corneal power (cTNP) and mean true net corneal power (mTNP) of the Pentacam system to give a keratometry (K) reading for calculating IOL (intraocular lens) power in eyes following refractive surgery. Methods: Refraction, an automated K-reading (Km), cTNP and mTNP were measured for 15 eyes that required cataract surgery and had previously undergone refractive surgery. The difference between postoperative manifest refraction values and target refraction values calculated with the SRK/T formula using cTNP were compared with the one using mTNP. Results: The mean deviation from the desired post-cataract refractive outcome was 0.60 diopter (D) ±0.47 (standard deviation) using cTNP; 0.75±0.54 using mTNP (p=0.386). The actual refraction was within ±0.50D of the intended refraction for 60% (cTNP) and 33.3% (mTNP) of eyes, and within ±1.00D for 93% (cTNP) and 66.7% (mTNP) of eyes. Conclusions: Although not statistically significant, the cTNP showed better accuracy than mTNP to give a keratometry (K) reading for post-refractive surgery eyes requiring cataract surgery.

      • KCI등재

        면니트의 CPB 염색에서 NNMF 알고리즘을 이용한 새로운 컬러처방 예측 기법

        이정호,이인열,조성훈,조현태,Lee, Jung Ho,Lee, In Yeol,Cho, Seong Hun,Cho, Hyeon Tae 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.1

        To ensure the reproducibility of the dyeing of cotton knit by cold pad batch(CPB), the solubility, alkali stability and substantivity of multi functional type reactive dyes were tested. The color difference of the cotton knit CPB dyeing products between laboratory and dye house was measured. The results showed that the equipments, dyes and fabrics, all of them influenced the color differences of the final samples between the laboratory and dye house. These factors could not be controlled to reduce the color difference between the laboratory and dye house in the conventional computer color matching algorithm. A new color match prediction method based on the non-negative matrix factorization(NNMF) algorithm was introduced and the applicability was studied by comparing with the conventional color match prediction method based on the Newton-Lapson algorithm. The color match prediction method based on the NNMF showed more accurate recipe prediction results than the conventional color matching method for the CPB dyeing process of cotton knit fabric.

      • KCI등재

        선회유동 교란에 따른 벤츄리 유량측정의 불확실성 해석

        이정호,윤석호,유청환,박상진,정장환 한국유체기계학회 2009 한국유체기계학회 논문집 Vol.12 No.6

        Venturi has long been an attractive method of measuring flow rate in a variety of engineering applications since pressure loss is relatively small compared with other measuring methods. The current study focuses on making detailed uncertainty estimations as the upstream flow disturbance affects uncertainty levels of the flow rate measurement. Upstream flow disturbance can be determined by 9 different swirl generators. Measurement uncertainty of flow rate has been estimated by a quantitative uncertainty analysis which is based on the ANSI/ASME PTC 19.1-2005 standard. The results of flow rate uncertainty analysis show that the case with systematic error has higher than that without systematic error. Especially the result with systematic error exhibits that the uncertainty of flow rate was gradually increased by swirl flow disturbance. The uncertainty of flow rate measurement can be mainly affected by differential pressure and discharge coefficient. Flow disturbance can be also reduced by increasing of the upstream straight length of Venturi.

      • KCI등재후보

        국가대표 110m 허들선수의 경기력 향상을 위한 허들링의 운동학적 분석

        이정호,길호종 한국스포츠학회 2017 한국스포츠학회지 Vol.15 No.3

        본 연구는 대한민국 남자 110m 허들경기의 기술 향상을 위하여 실시된 운동학적 연구이다. 그동안의 선행연구들 은 피험자의 동질성 확보에서 매우 취약하였다. 이로 인해 각기 다른 체격 조건에서 발생될 수 있는 기술적 차이는 배재 된 채 절대적인 기량 차이가 발생한 것으로 구분되기 쉬웠다. 본 연구는 이러한 문제를 해결하기 위하여 동일한 체격 조 건을 갖춘 두 피험자를 대상으로 동일한 분석법을 적용하여 분석하였다. 이를 통해 보다 명확한 기술요인을 찾고자 실시 하게 되었다. 대상자는 전 세계기록 보유자인 Colin Ray Jackson 선수의 운동학 자료(Coh, 2003)와 동일한 촬영법을 적용한 대한민국 국가대표선수의 운동학적 실험 자료로 비교하였다. 측정은 DLT (Direct Linear Transformation) 방 법을 사용하였다. 비교를 통해 허들구간에서 우수동작으로 얻어진 결론은 첫째, 신체중심의 최대 수평속도를 끝까지 유 지하는 것이며, 둘째, 뻗고 당기는 발의 무릎 포인트 속도를 빠르게 전환 하는 것, 셋째, 착지에서 신체중심을 높게 유지하는 것이다. This study aimed to conduct a kinematic analysis of the hurdling event with the objective of increasing the competitive performance of 110-m hurdling event national team athletes. Preceding research needed improvement owing to the inconsistent homogeneity in the analyzed test subject groups. This caused a misinterpretation of the absolute differences in the abilities of athletes as differences in techniques followed according to their various body builds, based on which they were trained for improving performance. To address this issue, this research analyzed two athletes of similar physical builds using the same analysis method, with an objective of increasing the accuracy factors. A comparison of the kinematic test data of athletes from the Korean national team with those of the world record holder, Colin Ray Jackson (Coh, 2003), obtained under identical conditions was performed. The direct linear transformation method was used. The results of the comparative analysis confirmed that athletes must maintain the horizontal maximum velocity of their center of mass (COM) till the very end of each hurdle and that the velocity of the knee position point of the foot of the leg that stretches out and pulls athletes forward must be high. Furthermore, COM must be high when landing.

      • KCI등재

        공공도서관의 장소성 형성구조에 관한 연구

        이정호,Lee, Jeong-Ho 한국비블리아학회 2012 한국비블리아학회지 Vol.23 No.3

        The purpose of this study is to identify the formation of placeness in public libraries, to understand placeness of public library, and to explain its social value. This study conducted causality analysis of placeness formation in public libraries. And this study analysed the direct and indirect effects of place attachment in public libraries as a mediated factor between placeness factor and perceived place value. 본 연구는 공공도서관의 장소성 형성구조를 살펴봄으로써 공공도서관의 장소성에 대한 이해와 공공도서관의 가치에 대해 설명하는 것을 목적으로 하였다. 본 연구에서는 공공도서관의 장소성 형성요인, 장소애착, 장소가치 지각, 이용자 행위의도를 연구 변인으로 설정하였고, 각각의 변인들 간에 어떠한 인과관계를 가지고 서로 영향을 미치고 있는가를 알아보았다. 또한 공공도서관의 장소성 형성요인과 장소가치 간의 매개 요인으로서 장소애착의 직 간접적인 효과를 규명하였다.

      • KCI등재

        고탄성 런닝화가 생체역학적 요소에 미치는 영향

        이정호 한국운동역학회 2020 한국운동역학회지 Vol.30 No.4

        Objective: Shoes midsole are crucial for reducing impact forces on the lower extremity when someone is running. Previous studies report that the cushioning of running shoes make it possible to use less muscular energies. However, the well cushioned shoes result in energy loss as the shoe midsole is compressed. Cushioning reduces the load on the body, it also results in the use of more muscle energy to create propulsion force. The purpose of this study was to investigate the effect of the difference of shoe hardness & resilience on the running. Method: Shoes midsole are crucial for reducing impact forces on the lower extremity when someone is running. Previous studies report that the cushioning of running shoes make it possible to use less muscular energies. However, the well cushioned shoes result in energy loss as the shoe midsole is compressed. Cushioning reduces the load on the body, it also results in the use of more muscle energy to create propulsion force. The purpose of this study was to investigate the effect of the difference of shoe hardness & resilience on the running. Results: In vastus lateralis muscle Activation, Type 55 were significantly higher for Type 50 and X (p=0.019, p=0.045). In Gluteus Maximus muscle activation, Type 55 was significantly lower for type 50 (p=0.005). In loading late, Type 55 and X were significantly higher for type 45 (p=0.008, p=0.006). Conclusion: The components of a shoe are very complex, and there can be many differences in manufacturing as well. Although some differences can be found in the biomechanical variables of the high elastic midsole, it is difficult to interpret the performance enhancement and injury prevention.

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