• Title/Summary/Keyword: Gi-Hak

Search Result 602, Processing Time 0.031 seconds

Strategies to Multiply Elite Cow in Hanwoo Small Farm

  • Lee, Seung Hwan;Kim, Ui Hyung;Dang, Chang Gwan;Aditi, Sharma;Kim, Hyeong Cheul;Yeon, Seung Heum;Jeon, Gi Jun;Chang, Sun Sik;Oh, Sung Jong;Lee, Hak Kyo;Yang, Bo Suk;Kang, Hee Seol
    • Journal of Embryo Transfer
    • /
    • v.28 no.2
    • /
    • pp.79-85
    • /
    • 2013
  • The recent development in genetic assisted selection (combining traditional- and genome assisted selection method) and reproduction technologies will allow multiplying elite cow in Hanwoo small farm. This review describes the new context and corresponding needs for genome assisted selection schemes and how reproductive technologies can be incorporated to get more genetic gain for cow genetic improvement in Hanwoo. New improved massive phenotypes and pedigree information are being generated from commercial farm sector and these are allowing to do genetic evaluation using BLUP to get elite cows in Korea. Moreover cattle genome information can now be incorporated into breeding program. In this context, this review will discuss about combining the reproductive techniques (Multiple Ovulation Embryo Transfer; MOET) and genome assisted selection method to get more genetic gain in Hanwoo breeding program. Finally, how these technologies can be used for multiplication of elite cow in small farm was discussed.

Accelerated Life Test of Industrial Cleaner Motor (산업용 청소기 모터의 가속수명시험)

  • Eom, Hak-Yong;Lee, Gi-Chun;Chang, Mu-Seong;Park, Jong-Won;Lee, Yong-Bum
    • Journal of Applied Reliability
    • /
    • v.18 no.3
    • /
    • pp.193-200
    • /
    • 2018
  • Purpose: In this study, the life of the motor is investigated by performing the accelerated life test with the brush wear of the industrial cleaner motor as the main failure mode. Methods: The accelerating stress factor of the accelerated life test is a voltage, which can increase the number of revolutions of the motor to accelerate the brush wear due to the friction between the brush and the commutator. Also, the accelerating stress level was determined after determining the maximum allowable level of the voltage through the preliminary test. Results: The motor failure time at each accelerating stress level was predicted by regression analysis with brush wear length as performance degradation data. The main failure mode, which is brush wear, of the motor was reproduced by this test. The shape parameter of the Weibull distribution was confirmed to be the same statistically at all accelerating stress levels by the likelihood ratio test. Conclusion: The life of the motor was investigated by performing the accelerated life test with the brush wear of the industrial cleaner motor as the main failure mode. Through the accelerating test method of the cleaner motor, various life expectancy and life expectancy of the acceleration factor are predicted.

A Spatial Data Construction System with Video GIS (비디오 GIS를 이용한 공간데이터 구축 시스템)

  • Joo, In-Hak;Yoo, Jae-Jun;Nam, Kwang-Woo;Kim, Min-Soo;Lee, Jong-Hun
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • 2002.11c
    • /
    • pp.1903-1906
    • /
    • 2002
  • Video GIS is a spatial information system where video is used and integrated with map or other media such as 3D graphics, image, video, and satellite imagery. The information expressed by video, in nature, can provide realistic information. The connection of map and image of actual geographic object brings realistic visualization, which overcomes the limitation of conventional map-based GIS. In the suggested video GIS, location information is contained in video data and thereby enables two-sided searching, browsing, and analyses. In this paper, we suggest video GIS that integrates and manages video and map, and that constructs spatial information. We also develop a prototype system of video GIS in the field of roadside facility management, and show the results.

  • PDF

Two-Dimensional Analysis of the Characteristics at Heterojunction of MODFET Using FDM (유한 차분법을 이용한 MODFET의 이차원적 해석)

  • Jung, Hak-Gi;Lee, Moon-Key;Kim, Bong-Ryul
    • Journal of the Korean Institute of Telematics and Electronics
    • /
    • v.25 no.11
    • /
    • pp.1373-1379
    • /
    • 1988
  • This paper describes a two-dimensional analysis of the potential distribution and electron concentration of the MODFET at channel using FDM. More exact analysis can be obtained by two-dimensional analysis which considers parasitic effects ignored in one-dimensional analysis. Using Poisson and Shrodinger equations, the potential distribution and the wave function are calculated within a constant error bound. As a result, the relations between the thickness of spacer, doping concentration of (n) AlGaAs layer, and the sheet density of the 2DEG (2 Dimensional Electron Gas) of MODFET at channel are suggested quantitively. The sheet density of the 2DEG is increased as the thickness of the spacer is decreased of the doping concentration of the (n)AlGaAs layer is lowered.

  • PDF

Total joint reconstruction using computer-assisted surgery with stock prostheses for a patient with bilateral TMJ ankylosis

  • Rhee, Seung-Hyun;Baek, Seung-Hak;Park, Sang-Hun;Kim, Jong-Cheol;Jeong, Chun-Gi;Choi, Jin-Young
    • Maxillofacial Plastic and Reconstructive Surgery
    • /
    • v.41
    • /
    • pp.41.1-41.6
    • /
    • 2019
  • Backgrounds: The purpose of this study is to discuss the total joint reconstruction surgery for a patient with recurrent ankylosis in bilateral temporomandibular joints (TMJs) using three-dimensional (3D) virtual surgical planning, computer-aided manufacturing (CAD/CAM)-fabricated surgical guides, and stock TMJ prostheses. Case presentation: A 66-year-old female patient, who had a history of multiple TMJ surgeries, complained of severe difficulty in eating and trismus. The 3D virtual surgery was performed with a virtual surgery software (FACEGIDE, MegaGen implant, Daegu, South Korea). After confirmation of the location of the upper margin for resection of the root of the zygoma and the lower margin for resection of the ankylosed condyle, and the position of the fossa and condyle components of stock TMJ prosthesis (Biomet, Jacksonville, FL, USA), the surgical guides were fabricated with CAD/CAM technology. Under general anesthesia, osteotomy and placement of the stock TMJ prosthesis (Biomet) were carried out according to the surgical planning. At 2 months after the operation, the patient was able to open her mouth up to 30 mm without complication. Conclusion: For a patient who has recurrent ankylosis in bilateral TMJs, total joint reconstruction surgery using 3D virtual surgical planning, CAD/CAM-fabricated surgical guides, and stock TMJ prostheses may be an effective surgical treatment option.

A Study on the GIS-based Method of Building Digital Forest Land-Use Map (GIS 기반 산지이용구분도 작성방법에 관한 연구)

  • Park, Young-Kyu;Kwon, Soon-Duk;Song, Chul-Chul;Kwon, Dae-Soon;Lee, Jong-Hak;Kim, Hyung-Ho
    • Journal of the Korean Association of Geographic Information Studies
    • /
    • v.9 no.3
    • /
    • pp.46-57
    • /
    • 2006
  • The purpose of this study is to develop a GIS-based digital Forest Land-use(FLU) Map Building Process which will be adopted as the map publishment methodology for the official FLU Map notification in 2007. The process is composed of 6 steps, extracting forest lands from Continuous Land Map(CLM), extracting forest land borders restricted by other laws, extracting boundaries between semi- and reserve forest lands, making digital FLU map by integrating spatial and attribute data among the extractions, printing FLU map and FLU register, and re-correcting zoning errors. Through the process, in 1:25,000 and 1:5,000 scale, 14 and 173 sheets of the FLU Maps and it's register were created for the whole area of Hwaseong, Kyunggi.

  • PDF

Evaluation of Landslide Susceptibility Using GIS and RS (GIS 및 RS기법을 활용한 산사태 취약성 평가)

  • Kim, Kyung-Tae;Jung, Sung-Gwan;Park, Kyung-Hun;Oh, Jeong-Hak
    • Journal of the Korean Association of Geographic Information Studies
    • /
    • v.8 no.1
    • /
    • pp.75-87
    • /
    • 2005
  • This study aims at predicting and mapping of the landslide susceptibility in the Geumho river watershed using GIS and Remote Sensing techniques. We constructed the spatial database of affecting factors such as slope angle, slope aspect, lithology, landuse, and vegetation index (NDVI) at a $30m{\times}30m$ resolution. The landslide susceptibility of the study area was predicted through overlay analysis and adding up estimation matrix, and the predicted map of landslide susceptibility with six categories (stable, very low, low, moderate, high, very high) was constructed. As the results, it showed that the very high susceptibility zones made up approximately 0.3% of the total study area, and these zones were mainly distributed in the forest area with the high slope angle and low vegetation index.

  • PDF

Firing Test for Hybrid Rocket Motor with 650 kgf Thrust Level (추력 650 kgf 급 하이브리드 로켓 모터의 연소시험)

  • Lee, Jung-Pyo;Kim, Soo-Jong;Kim, Gi-Hun;Cho, Jung-Tae;Kim, Hak-Chul;Woo, Kyong-Jin;Do, Gyu-Sung;So, Jung-Soo;Oh, Jung-Soo;Cho, Min-Gyung;Moon, Hee-Jang;Sung, Hong-Gye;Kim, Jin-Kon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2009.11a
    • /
    • pp.503-506
    • /
    • 2009
  • In this study, we presented the results of static firing tests on the PE/LN2O hybrid rocket motor, which has a thrust of 650 kgf level. Through the early tests, we found that the combustion chamber pressure and the thrust were lower than design values because an actual oxidizer flow rate was less than that expected. In order to complement this result, the methods of decrease of nozzle throat and the increase of oxidizer mass flow rate were conducted in the next experiment, and we studied the combustion phenomena with the experimental results. Also we compared and analyzed a difference of combustion characteristics on scale effect. It show that a sub-scale motor regression rate was a little less than that of a lab-scale motor with the same oxidizer mass flux. Results of this study might be used as a basic data for development of hybrid sounding rocket.

  • PDF

A Study on the Combustion Characteristic in Hybrid Rocket Motor using PE/$LN_2O$ (PE/$LN_2O$ 하이브리드 로켓 모터의 연소특성에 관한 연구)

  • Kim, Gi-Hun;Lee, Jung-Pyo;Kim, Soo-Jong;Cho, Jung-Tae;Kim, Hak-Chul;Woo, Kyoung-Jin;Sung, Hong-Gye;Moon, Hee-Jang;Kim, Jin-Kon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2009.05a
    • /
    • pp.233-236
    • /
    • 2009
  • In this study, the characteristic of the hybrid rocket motor with $LN_2O$(Liquid Nitrous oxide) was investigated experimentally. HDPE(High Density PolyEthlene) was used as fuel with different sized single port. When used $LN_2O$, combustion efficiency is lower than using $GN_2O$(Gas Nitrous oxide), because of completeness of vaporization of droplet and mixing. And regression rate was changed by different oxidizer phase. This behavior was considered that flame temperature and combustion of solid fuel front/end surface.

  • PDF

A Study on Vascular Plants of Uninhabited Islands in the Deokjeok Archipelago (덕적군도 내 무인도서의 관속식물상 연구)

  • Kim, Jung-Hyun;Yun, Jong-Hak;Nam, Gi-Heum;Lee, Jung-Hyun;Choi, Byoung-Hee;Lee, Byoung-Yoon
    • Journal of Environmental Science International
    • /
    • v.20 no.1
    • /
    • pp.1-23
    • /
    • 2011
  • This study was carried out to investigate the flora of uninhabited Island in the Deokjeok Archipelago. The vascular plants which were collected in 5 times (from Jun. 2009 to Apr. 2010) were identified as 350 taxa in total, including 89 families, 231 genera, 309 species, 5 subspecies, 31 varieties, and 5 forms. There were many useful plants such as 2 taxa of Korean endemics and 2 taxa of rare plants which were proposed by the Korea Forest Service. The specially determined plants which were categorized as 5 degrees in all by the Ministry of Environment appeared as 49 taxa; Degree V was one taxon; Senecio nemorensis and IV was one taxon; Apocynum lancifolium and III was 2 taxa; Stauntonia hexaphylla, Hylotelephium spectabile and I was 45 taxa; Machilus thunbergii, Neolitsea sericea, Hedera rhombea, etc. Based on the plants which were approval objects when transfer overseas were 5 taxa, and 21 taxa of evergreen plants were recorded in the investigated area. The naturalized plants were identified as 15 taxa, and their naturalization ratio were found to be 4.2% respectively.