• Title/Summary/Keyword: Improvement proposal

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Development of Computer Program for Solving Astronomical Ship Position Based on Circle of Equal Altitude Equation and SVD-Least Square Algorithm

  • Nguyen, Van-Suong;Im, Namkyun
    • Journal of Navigation and Port Research
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    • v.38 no.2
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    • pp.89-96
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    • 2014
  • This paper presents an improvement for calculating method of astronomical ship position based on circle of equal altitude equation. In addition, to enhance the accuracy of ship position achieved from solving equation system, the authors used singular value decomposition (SVD) in least square method instead of normal decomposition. In maths, the SVD was proved more numerically stable than normal decomposition. Therefore, the solution of equation system will be more efficient and the result would be more accurate than previous methods. By proposal algorithm, a computer program have been developed to help the navigators in calculating directly ship position when the modern equipment has failure. Finally, some of experiments are carried out to verify effectiveness of proposed algorithm, the results show that the accuracy of ship position based on new method is better than the intercept method.

Application SVD-Least Square Algorithm for solving astronomical ship position basing on circle of equal altitude equation

  • Nguyen, Van Suong;Im, Namkyun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.10a
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    • pp.130-132
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    • 2013
  • This paper presents an improvement for calculating method of astronomical vessel position with circle of equal altitude equation based on using a virtual object in sun and two stars observation. In addition, to enhance the accuracy of ship position achieved from solving linear matrix system, and surmount the disadvantages on rank deficient matrices situation, the authors used singular value decomposition (SVD) in least square method instead of normal equation and QR decomposition, so, the solution of matrix system will be available in all situation. As proposal algorithm, astronomical ship position will give more accuracy than previous methods.

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Statistical Analysis about Characteristics of Tunnel Portal Slopes on the National Highway in Korea (국내 일반국도 터널 갱구사면 특성 통계 분석)

  • Kwon, O-Il;Baek, Yong;Koo, Ho-Bon;Bae, Gyu-Jin
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.745-750
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    • 2005
  • The demand of tunnels has been increased for the linear improvement of general national highway, and road construction and/or enlargement in Korea. Also, the collapses of tunnel portal slope have been increased in recent due to heavy rain caused by global warming. Therefore, it has been risen the requirement of system for the stability of tunnel portal slope in Korea as well as all over the world. The objective of this research is to develop an effective maintenance system for supervising the tunnel portal slope. This paper is a basic proposal to execute a survey on the current status and state of the tunnel portal slopes that were already installed along general national highways.

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Preliminary Study on the Necessity of Safe Management for Small Construction Sites (소규모 건축현장의 안전관리 필요성에 대한 기초연구)

  • Lim, Jung-Min;Kim, Ju-Hyung;Kim, Jae-Jun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.141-142
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    • 2011
  • This study is a relatively small scale compared to the massive construction company, construction company's safety management level of the low. A small architectural scene safety management is a necessity for basic research as a whole and of 67.20% died in the disaster, which killed the disaster scene in a small building. Small construction site for a reflections of the prevailing security situation, the existing literature and statistical data to determine what the issue, for the purpose of the proposal and come up with improvement measures.

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Proposal for performance improvement of SCORM Conformance Test (SCORM Conformance Test 의 성능 개선방법 제안)

  • Choi, Ji-Yeon;Cho, Dong-Sub
    • Proceedings of the KIEE Conference
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    • 2004.07d
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    • pp.2583-2585
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    • 2004
  • 90년대 후반부터 웹 기반 수업(Web-based instruction)이라 하여 인터넷을 이용한 새로운 교육방법이 시도되기 시작하여 현재는 IEEE, AICC, IMS 등의 여러 e-Learning 표준안에 종합적으로 수렴하는 형태인 SCORM을 ADL에서 발표하면서 SCORM을 기준으로 다양한 컨텐츠들이 개발되고 있다. 이런 컨텐츠들은 기술적인 면에 있어서 방대한 정보들을 다루고 있지만 e-Learning 표준안인 SCORM에 따랐는지 (SCORM 표준안에 맞게 설계가 되었는지)를 확인해 볼 필요가 있기 때문에 ADL에서 SCORM conformance를 체크하기 위한 test suite를 제안하였다. 이 test suite는 사용자가 컨텐츠를 생성할 때 필요한 중요한 정보들을 구조화하여 사용자로 하여금 편리성을 느끼도록 하였지만 다른 세부적인 문제들이 표출되고 있어 본 논문에서는 이를 개선하기 위한 제안을 하고자 한다.

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A Study on Improvement of Method for Measuring the Shield Performance of Shielding Enclosures (전자파 차폐실의 차폐효과 측정방법 개선에 관한 연구)

  • Yeon, Jae-Sung;Kim, Hie-Sik
    • Proceedings of the IEEK Conference
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    • 2009.05a
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    • pp.350-353
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    • 2009
  • The shielding enclosure is very essential device to test the electromagnetic wave power generated by various RF equipments. Some standards for the shielding enclosures were established to test them in right method. Generally, There are IEEE-STD-299 and MIL-STD-285 and NSA-65-6 of the method for measuring the effectiveness of shielding enclosures, the IEEE-STD-299 combined MIL-STD-285 and NSA-65-6 about the method for measuring shielding effectiveness(SE) about 1969 years, but, the measurement point of 299 proposal is many points(including shielding wall, seam, coner beat, shielding door, etc) and demand long time of measurement. To improve SE test method for shielding enclosures was studied and suggested to develop a proper test procedure. First, we measure reference level as frequency range and H/V polarization, secondly, measure leakage point, and finally, measure shield effect and calculate SE. Our method has a merit of the less measurement point than IEEE-STD-299, and shorten time than 299, and define representation SE of shielding enclosure effectively.

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A Study on the Actual Education Condition and Improvement of Education Program about Forest Fire (산불교육실태 및 개선방안에 관한 연구)

  • Lee, Si-Young
    • Fire Science and Engineering
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    • v.24 no.6
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    • pp.13-19
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    • 2010
  • In this study, surveys of forest fire division of eight local government about a education program for forest fire prevention and attacking of Forest Human Resources Development Institutes were conducted. In the result, questionnaire answers about improvements of curriculum, requested subject, training camp for forest fire attacking and others were analyzed. So, we made an alternative proposal of education program about forest fire for actively meeting a change of forest condition and forest fire management policy, strengthening of ability that officers in forest fire division required, and enhancing a efficiency.

A Study on the Improvement for Workability of Concrete with Belite Cement (4종(벨라이트)시멘트의유동성 향상에 대한 연구)

  • 하상운;구본창;김동석;하재담;이종열
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.247-250
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    • 2000
  • As construction technology advances, most of concrete structures are becoming larger and taller. Therefore, high strength and high quality concrete is necessary for them. Nowadays, the proposal of using type IV(belite cement) is investigated to satisfy high flowing, low heat, and ho호 strength. In this study, the flow value and compressive strength of mortar were investigated according to usage of AE high range water reducer. And the slump flow value, falling time and heigth difference of concrete with beilte cement and ordinary cement were examined depending on water cement ratio, sand ratio and unit water weigth, and compressive strength to checked depending on age.

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Proposal for Using Sine with Dwell for the Evaluation of ESC for Medium Commercial Vehicles (중형 상용차량 ESC 평가를 위한 Sine with Dwell Test 제안)

  • Kwon, Baeksoon;Yi, Kyongsu
    • Journal of Auto-vehicle Safety Association
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    • v.7 no.2
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    • pp.32-38
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    • 2015
  • A sine with dwell test is well known as a test scenario for evaluation of performance of electronic stability control(ESC) on passenger vehicles and heavy commercial vehicles. However, when it comes to ESC for medium commercial vehicles, the test scenario has not been established yet. In this paper, the sine with dwell test was modified considering characteristics of medium commercial vehicles. The three main modifications of the original test scenario are the steering angle level, steering frequency, and loading condition of the vehicle. These modifications are derived from simulation study for different medium commercial vehicles. From simulation study, it was shown that the ESC system for medium commercial vehicle is objectively evaluated by the proposed test scenario. A clear improvement on vehicle stability was seen in the results when ESC system was used.

A Study on the Color-Scape about Fishing Village and Harbor in Gangwon East Coast (강원 동해안 어촌어항의 경관색채에 관한 분석 연구)

  • Cho, Won-Seok;Kim, Heung-Gee
    • Journal of the Korean Institute of Rural Architecture
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    • v.9 no.2
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    • pp.121-128
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    • 2007
  • This study aims to propose directions of color-scape about fishing village and harbor in East coast. In order to offer better landscape in harbor; Namae and Sachun, such as regional atmosphere and identification are to analyze with color planning. For the quality of color-scape, natural color, regional color of harbor may be possible to work out future harbor surrounding by evaluation scale and then hue, value, chroma can be estimated systematically. This survey suggests that color of harbor is to be environmental and regional color control. We analyze that the color-scape planning through the both whole harmony and organic combination is important elements of satisfaction to the people of experience with color environments. Consequently, some proposal of color guideline by analysis of color simulation will be useful to make out preliminary design criteria in improvement of color.

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