• Title/Summary/Keyword: Full Expansion

Search Result 288, Processing Time 0.033 seconds

Low Computational Adaptive Expanded Block Search Motion Estimation Method (저연산 적응형 확장 블록 탐색 움직임 추정 기법)

  • Choi, Su-Woo;Yun, Jong-Ho;Cho, Tae-Kyung;Choi, Myung-Ryul
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.11 no.4
    • /
    • pp.1254-1259
    • /
    • 2010
  • In this paper, Low Computational Adaptive Expanded Block Search Motion Estimation Method is proposed. Proposed method classifies ME blocks as Average Motion Block(AMB) and Local Motion Block(LMB) according to correlation of reference frame. It could reduce the computational complexity with performing Modified Fast Search(MFS). And accuracy of MV is also increased by 4 sub-blocks on LMB and Block Expansion(BE). The experimental results show that the proposed method has better performance that increased 1.8dB than Diamond Search and 0.6dB than Full Search with 7.5 % computation of Full Search. The proposed method could be applied to video compression and Frame Rate Conversion(FRC).

Design and Fabrication of Full-Scale Regenerative Cooling Combustion Chamber (${\varepsilon}$=12) of Liquid Rocket Engine for Ground Hot Firing Tests (지상연소시험용 실물형 재생냉각 연소기(확대비 12)의 설계 및 제작)

  • Kim, Jong-Gyu;Han, Yeoung-Min;Seo, Seong-Hyeon;Lee, Kwang-Jin;Choi, Hwan-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2007.11a
    • /
    • pp.114-118
    • /
    • 2007
  • Design and fabrication of a 30-tonf-class full-scale regenerative cooling combustion chamber of a liquid rocket engine for a ground hot firing test are described. It has chamber pressure of 60 bar and nozzle expansion ration of 12 and manufactured to have a single welded structure of· the mixing head and the chamber. The material of the mixing head is STS316L which has excellent mechanical property in cryogenic condition. The chamber comprise of the cylinder, nozzle throat, and 1st/2nd nozzle parts. The material of the inner jacket is copper alloy/STS329J1/STS316L and that of the outer jacket is STS329J1. The components of· the combustor were manufactured by mechanical processing including lathing, milling, MCT, rolling and pressing. The machined components were integrated to a single body by means of general welding, electron beam welding(EBW), and brazing.

  • PDF

Effects of Composition and Concentration of Media on the Acclimation of the Shoots of Scrophularia buergeriana Miquel Produced in Bioreactor (생물반응기 생산 현삼 신초의 순화에 미치는 배지의 영향)

  • Hahn, Suk-Hoon;Chae, Young-Am
    • Korean Journal of Medicinal Crop Science
    • /
    • v.9 no.1
    • /
    • pp.62-67
    • /
    • 2001
  • This study was carried out to investigate the optimum composition and concentration of medium for the acclimation of the shoots derived from bioreactor culture of Scrophularia buergeriana. Rooting and growth of the shoots cultured in bioreactor for 4 weeks were better on liquid full strength MS medium while one-tenth of MS medium was good for rooting and growth of the shoots cultured in bioreactor for 6 weeks. Leaf expansion was more effective in the shoots cultured for 6 weeks on solid MS medium than in those cultured for 4 weeks. No leaf expanded in liquid medium. Vitrification rate was higher in full strength solid MS medium than in half strength MS medium. It is concluded that acclimation of the shoots is more effective on the half strength solid MS medium containing 1.2% agar.

  • PDF

Thermal Deformation Measurement of Notched Structure Using Global-local Multi-DIC System (전역-국부 다중 DIC 시스템을 이용한 노치 구조물의 열변형 계측)

  • Xin, Ruihai;Doan, Nguyen Vu;Goo, Nam Seo
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.49 no.8
    • /
    • pp.617-626
    • /
    • 2021
  • During supersonic flight of vehicles, the thermal behavior of structures under high-temperature environment is important for thermal-structural design. In this study, full-field thermal deformation and stress concentration of the notched structure was performed using global-local multi-digital image correlation (multi-DIC) systems. This techniques were developed and implemented by multi-DIC systems consists of 2D DIC system and 3D DIC system. The specimen was heated in a heating chamber to achieve the thermal expansion behavior. Then the images of structure's deformation and stress concentration at various temperature were recorded and analyzed by multi-DIC system. Afterward, full-field thermal deformation of the notched structure was determined with DIC technique and stress concentration at the notched structure was calculated by further processing. Finite element analysis of the notched structure is performed in ABAQUSTM and the results of the experiments show good agreement with those obtained from simulation. The results achieved in this study show the efficiency of the muilti-DIC method in thermal deformation as well as stress concentration of notched structure.

Development of a Thermoplastic Composite Parabolic Antenna Reflector using Automated Fiber Placement Method (자동섬유적층법을 이용한 열가소성 복합재료 접시형 안테나 반사판 개발)

  • Kim, Jin-Bong;Kim, Tae-Wook
    • Composites Research
    • /
    • v.19 no.1
    • /
    • pp.15-21
    • /
    • 2006
  • It is very difficult to make complex 3 dimensional curved-shape composite laminates using the advanced unidirectional composite prepregs. This study shows development process of subscale composite parabolic antenna reflector using unidirectional AS4/PEEK prepreg tapes. The AS4/PEEK thermoplastic composite materials are known to have good thermal and chemical stabilities in addition to their high specific strength and modulus. Various lamination methods were investigated through finite element analyses to make up the laminate design of the reflector. The automated fiber placement method was used to fabricate the reflector. The thermal expansion test using full-bridge strain gage circuits was done to verity the performance of the composite product.

A Case Study on the Management for Mid-to Senior Age Human Resources of Enterprises following the Extension of Retiring Age Law (정년연장 법제화에 대응하는 기업의 장년인력관리 사례연구)

  • Oh, Ji-hyun;Lee, Young-min
    • Journal of Practical Engineering Education
    • /
    • v.6 no.2
    • /
    • pp.119-126
    • /
    • 2014
  • The purpose of this study is to take a look at the cases on managing the senior human resources of business enterprises following the significant number of retirement of baby-boom generation and obligatory retirement age of 60 years of age and present the implication points in policies. With respect to the implication of the company, it would urgently require the introduction of programs with long-term point of view for career management strategy from the time of employment to the resignation, settlement of company leave system called chulhyang, expansion of wage peak system, full-time job transfer support center within the enterprise for retirement management, expansion of various consulting, conversion of paradigm on senior human resource management of top management in the enterprise level. In the government level, it is considered as required for systematic supplementation of the chulhyang system, improvement of support system for employment encouragement fund, expansion of national work capability standard-based senior employment field as well as task development, support for innovation of personnel management system, supply of management manual and implementation of job transfer education for life-time conversion period in the government level.

The MeSH-Term Query Expansion Models using LDA Topic Models in Health Information Retrieval (MeSH 기반의 LDA 토픽 모델을 이용한 검색어 확장)

  • You, Sukjin
    • Journal of Korean Library and Information Science Society
    • /
    • v.52 no.1
    • /
    • pp.79-108
    • /
    • 2021
  • Information retrieval in the health field has several challenges. Health information terminology is difficult for consumers (laypeople) to understand. Formulating a query with professional terms is not easy for consumers because health-related terms are more familiar to health professionals. If health terms related to a query are automatically added, it would help consumers to find relevant information. The proposed query expansion (QE) models show how to expand a query using MeSH terms. The documents were represented by MeSH terms (i.e. Bag-of-MeSH), found in the full-text articles. And then the MeSH terms were used to generate LDA (Latent Dirichlet Analysis) topic models. A query and the top k retrieved documents were used to find MeSH terms as topic words related to the query. LDA topic words were filtered by threshold values of topic probability (TP) and word probability (WP). Threshold values were effective in an LDA model with a specific number of topics to increase IR performance in terms of infAP (inferred Average Precision) and infNDCG (inferred Normalized Discounted Cumulative Gain), which are common IR metrics for large data collections with incomplete judgments. The top k words were chosen by the word score based on (TP *WP) and retrieved document ranking in an LDA model with specific thresholds. The QE model with specific thresholds for TP and WP showed improved mean infAP and infNDCG scores in an LDA model, comparing with the baseline result.

Suggestion of Challenges and Improvement Direction for the Degree-Linked High-Skilled Professional Course in Accordance with the Full Expansion of the Work-Study Combination PBL (일학습병행 PBL 확대에 따른 학위연계형 고숙련마이스터 과정의 과제와 개선방향 제안)

  • Lee, Seung-Jun;Kim, Seung-Hee
    • Journal of Practical Engineering Education
    • /
    • v.14 no.1
    • /
    • pp.179-194
    • /
    • 2022
  • After the work-study combination PBL method was first introduced into the P-Tech type in 2018, it was introduced into the degree-linked high-skilled professional course in operation as a pilot project in 2020, and ever since each department has reorganized the standard completion system to meet the PBL operation regulations and developed and operated PBL-based learning and training courses accordingly. With the expansion of the work-study combination PBL in 2021, the operating regulations were revised more elaborately. This paper examined the characteristics of the work-study combination PBL, the PBL operation regulations for each degree-linked high-skilled professional course, and the most recently implemented PBL operation regulations in detail through literature research. Based on this research, it introduced the development process and the result of the PBL-based standard completion system by the IT Convergence SW Engineering Department of KOREATECH and the result of the survey conducted to verify the suitability of the standard completion system after an operation and presented the challenges and improvements required for the degree-linked high-skilled professional course in relation to the changing operation regulations for the work-study combination PBL. This study is expected to provide universities with a reference to the development of training courses to smoothly apply the work-study combination PBL. It is also expected to contribute to the establishment and steady expansion of a unique PBL system that reflects the characteristics of work-study combination by presenting discourses on how the work-study combination PBL should develop, including high-skilled professional courses.

Extrusion Puffing of Pork Meat-Defatted Soy Flour-Corn Starch Blends to Produce Snack-like Products

  • Jennifer J. Jamora;Rhee, Ki-Soon;Rhee, Khee-Choon
    • Preventive Nutrition and Food Science
    • /
    • v.6 no.3
    • /
    • pp.163-169
    • /
    • 2001
  • To produce expanded, minimally hard extrudates from blends of raw pork meat (20%), defatted soy flour (25%), and corn starch using a single-screw extruder, various combinations of feed moisture, process temperature, and screw speed were evaluated. First series of extrusion runs were conducted according to a central composite rotatable design/response surface methodology (RSM). Upon assessing the full model for each response, insignificant terms were eliminated to determine final response surface models. Screw speed within the range evaluated was found to have no significant effect on expansion ratio (ER) or shear force (SF) of extrudates. Since examinations of the response surfaces and their generated grids of predicted values indicated that maximum ER and minimum SF were likely to be attained with a moisture-temperature combination outside the RSM experimental range, the second series of extrusion runs were conducted with several selected combinations of moisture and temperature to determine a practical optimum extrusion condition. The combination of 22.78% feed moisture, 16$0^{\circ}C$ process temperature, and 170 rpm screw speed was chosen as such a condition, and used in the final extrusion. The final product required less force to break than did commercial pretzel sticks.

  • PDF

A Study on the Value of School Libraries in the LIS(Library and Information Science) and the Field of Libraries in Korea (문헌정보학과 현장분야로서 학교도서관의 가치에 관한 연구)

  • Kim, Sung-Jun
    • Journal of Korean Library and Information Science Society
    • /
    • v.44 no.1
    • /
    • pp.73-97
    • /
    • 2013
  • The purpose of this study is to identify the value of school libraries and to find ways to realize the value after examining school libraries and teacher librarians in Korea. According to this study, school libraries can be useful resource to promote Koreans' social perception in all types of libraries and the LIS because school libraries are accessible to those who experience public education. As a major area of research and the field in the LIS, school libraries have strong possibilities to produce qualified librarians. The cooperation among librarians and legislative proceeding to staff full-time teacher librarians, and the expansion of school library researchers to activate field researches are needed in order to maximize the value.