• Title, Summary, Keyword: 전진도(全真道)

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Planning Guidance for Snow Control Material Storage Facilities Based on Case Studies (사례조사를 통한 제설전진기지 시설기준에 관한 연구)

  • Kim, Geun-Young;Kim, Hee-Jea;Park, U-Yeol
    • Journal of the Korea Institute of Building Construction
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    • v.16 no.4
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    • pp.381-388
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    • 2016
  • The snow control storage facilities have the physical requirements that are an anti-icing and deicing operations. They are efficiently and quickly performed, and composed of a vehicle depot for the snow removal equipment and truck, anti-icing and deicing chemical storages, and the control utilities. This study is to investigate the planning guidance of foreign countries, and the actual conditions of the snow control chemical storage facilities for expressway, the national highway and the local road, and is to suggest the planning guidelines. As some of the authorities have no fixed structures for the snow control storage, this study analyze the 5 cases constructed lately. From the result of the case studies, the operations performed in the snow control storage facilities and drawback of the facilities are analyzed with respect to layout, size, plan, and structure, and the improvement planning guidance is also suggested.

Geometrical description based on forward selection & backward elimination methods for regression models (다중회귀모형에서 전진선택과 후진제거의 기하학적 표현)

  • Hong, Chong-Sun;Kim, Moung-Jin
    • Journal of the Korean Data and Information Science Society
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    • v.21 no.5
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    • pp.901-908
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    • 2010
  • A geometrical description method is proposed to represent the process of the forward selection and backward elimination methods among many variable selection methods for multiple regression models. This graphical method shows the process of the forward selection and backward elimination on the first and second quadrants, respectively, of half circle with a unit radius. At each step, the SSR is represented by the norm of vector and the extra SSR or partial determinant coefficient is represented by the angle between two vectors. Some lines are dotted when the partial F test results are statistically significant, so that statistical analysis could be explored. This geometrical description can be obtained the final regression models based on the forward selection and backward elimination methods. And the goodness-of-fit for the model could be explored.

Changes in Soft Tissue Profile after Surgical Correction of Prognathic Mandible (하악전돌증의 악교정수술 후 연조직 형태변화에 대한 연구)

  • Sung, Sang-Jin;Park, Hyun-Do;Kim, Jae-Seung;Moon, Yoon-Shik
    • The korean journal of orthodontics
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    • v.30 no.3
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    • pp.355-365
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    • 2000
  • The treatment plan for orthognathic surgery must be based on accurate predictions, and this can be produced the most esthetic results. Treatment of prognathic mandible in adult is usually orthognathic surgery using mandible set back, but mandible with retruded chin point is needed additional chin augmentation. In this case, the directions between mandible and chin point are different therefore, the prediction of soft tissue reactions must be modified. In this study, we materialize the patients who was taken orthognathic surgery due to prognathic mandible, 11each(Group A) was taken only Bilateral Sagittal Sprit Ramus Osteotomy (BSSRO), 9each(Group B) was taken additional advancement genioplasty. The lateral cephalometric radiography taken 8 months later after orthognathic surgery by this patients were used. The results of this study were as follows : 1. The profile of lips was favorable after surgery due to upper lip to I-line became prominent and lower lip tc E-line was retruded. 2. In both group, upper lip moved posteriorly and nasolabial angle was increased. 3. The ratio of the soft tissue profile change in POGs point to skeletal B point movement was $84\%$ in group A and $66\%$ in group B, and there was statistical significance between group A and group B. 4. Vertical movement of hard tissue points is decreased in group A.

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KCS 선형의 파랑 중 자유항주모형시험

  • Yun, Geun-Hang;Kim, Dong-Jin;Yeo, Dong-Jin;Kim, Yeon-Gyu
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.9-11
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    • 2018
  • 선박의 파랑 중 조종성능 변화를 추정하기 위하여 선박해양플랜트연구소 공학수조에서 KCS 선형의 모형선으로 파랑 중 자유항주모형시험을 수행하였다. 파향, 파고, 파장 등이 변화는 규칙파 상태에서 KCS 선형의 35도 선회시험을 수행하여 파 중 선회궤적변화를 관찰하였고, 정상선회 상태에서 속도기반 궤적밀림 지수를 계산하였다. 계산된 속도기반 궤적지수를 정수 중 초기선회 상태에 외력으로 작용하여 그 시뮬레이션 결과를 보정하고 이를 파랑 중 초기선회 성능과 비교분석하였다. 그 결과 초기 선회 중 도출되는 선회성능인 전진거리, 전술선회직경은 선수파일 경우, 모형선의 전진방향 속도 변화를 추가적으로 고려해야함을 확인하였다.

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The Shapiro-Wilk Type Test for Exponentiality Based on Progressively Type II Censored Data (전진 제 2종 중도절단자료에 대한 Shapiro-Wilk 형태의 지수검정)

  • Kim, Nam-Hyun
    • The Korean Journal of Applied Statistics
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    • v.23 no.3
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    • pp.487-495
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    • 2010
  • This paper develops a goodness of fit test statistic to test if the progressively Type II censored sample comes from an exponential distribution with origin known. The test is based on normalizing spacings and Stephens (1978)' modified Shapiro and Wilk (1972) test for exponentiality. The modification is for the case where the origin is known. We applied the same modification to Kim (2001a)'s statistic, which is based on the ratio of two asymptotically efficient estimates of scale. The simulation results show that Kim (2001a)'s statistic has higher power than Stephens' modified Shapiro and Wilk statistic for almost all cases.

High Voltage Measurement using Fiber Interferometric Sensor (위상변조 광섬유센서를 이용한 고전압 측정)

  • Kim, Kwang-Soo;Jeon, Jin-Hong;Jung, Jun-Young
    • Proceedings of the KIEE Conference
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    • pp.2037-2039
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    • 2004
  • 고전압 전력기기분야에 광섬유 전압센서를 적용해보고자하는 연구는 20여년 전부터 꾸준히 진행되어 왔었다. 본 연구에서는 구조가 간편한 광섬유 패브리페로 간섭계를 이용한 고전압기기 적용형 전압센서가 시도되었다. 신호변환은 정전력을 이용하여 전압의 변화를 광섬유스트레인센서로 검출하며, 해상도를 확보하기 위하여 공진기의 길이를 1cm, 위상을 스캐닝하는 변조방법을 적용하였고, 교류전압 1000V까지 적용 타당성을 시험하였다.

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회원사 탐방-열상광학시스템용 비구면렌즈 전문 업체 (주)프리시젼옵텍스

  • Park, Ji-Yeon
    • The Optical Journal
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    • pp.44-46
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    • 2007
  • 열상광학시스템용 초정밀가공기술 분야에 주력해온 프리시젼옵텍스(대표.한상현.www.poptechs.com)는 군수분야에서만 활용도가 집중되어 있는 적외선카메라 기술을 민수분야에까지 다양하게 사용할 수 있도록 기술 개발에 매진하고 있다. 설립 4년여 만에 자체 사옥을 마련하고 '제2의 창업'을 다짐한 이 회사는 올해 1차적 목표로 모듈상품을 선보이며 적외선카메라 시스템 전문회사로 거듭나기 위한 일보 전진을 계획하고 있다.

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PIV Measurements of the Flow characteristics around a single rudder in a backward state (역추진시 단동타 주위 유동특성에 대한 PIV계측)

  • Shon, Chang-Bae;Gim, Ok-Sok;Oh, Woo-Jun;Lee, Chang-Woo;Lee, Gyoung-Woo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.383-384
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    • 2010
  • The control surface on a ship is to control the motion of it in forward and backward states. In this paper, the measured results has been compared with each other to predict the backward flow characteristics of the single rudder's 2-dimensional section at $Re=2.0\times10^4$ using 2-frame grey level cross correlation PIV method especially, The separation region appears at 10 to 20 degrees angle of attack in a forward state. The separation point and boundary layer demonstrate in the same angle of attack compared it with the forward states.

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A Study on Precision Position Control of 1 Axis Linear BLDC Motor for a Stage (반도체 제조장비용 Stage를 위한 1축 선형 브러시리스 DC 모터의 정밀 위치제어에 관한 연구)

  • Chun, Y.H.;Kim, J.W.;Jeon, J.H.;Jeon, J.W.;Kang, D.H.
    • Proceedings of the KIEE Conference
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    • pp.115-118
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    • 2001
  • 일반적으로 반도체 제조 공정은 매우 복잡하고 다양한 공정들로 구성된다. 이러한 공정 중 Stage 부분은 웨이퍼에 회로 패턴을 기입하기 위하여 웨이퍼를 미리 지정된 위치로 이송하는 공정으로 매우 높은 정밀도가 요구되고 있다. Stage에 대해서는 x, y, z축 뿐아니라 각 축에 대한 회전까지도 고려한 6축 제어가 수행되어야 한다. 본 논문에서는 stage에 대한 정밀제어의 기반기술로서 선형 BLDC 모터를 이용하여 1축 위치제어 시스템의 제어에 관하여 연구하였다. 선형 BLDC 모터의 이동 중 발생하는 추럭리플을 보상하여 제어기 설계시 선형 시스템으로 고려하여 제어기를 설계할 수 있도록 하는 방법을 제안하였으며 실험을 통하여 1[${\mu}m$]의 해상도를 갖는 위치검출 엔코더를 이용하여 5[${\mu}m$]의 정밀도를 얻을 수 있었다.

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