신경망을 이용한 내용기반 이미지 분류

이재원,강홍식,김상균 인제대학교기초과학연구소 2001 자연과학 Vol.5 No.-

본 논문에서는 내용기반 이미지 검색의 한 방법론으로써 웨이블릿 변환과 신경망을 이용한 방법을 제안한다. 분류 대상 이미지는 인터넷상의 다양한 이미지 중 전경과 배경의 구분이 뚜렷한 객체 이미지이다. 분류를 위한 특징은 웨이블릿 변환 후 추출된 형태 특징과 질감 특징을 이용한다. 추출된 특징 값들을 이용하여 이미지들에 대한 학습 패턴을 생성하고 신경망을 학습하여 분류기를 구성한다. 본 연구에서는 다양한 질감 특징 중 가장 높은 인식률을 보여주는 대비를 사용하였으며, 신경망의 학습 알고리즘은 역전파 알고리즘을 사용하였다. In this paper, we propose a method of content-based image classification using waveiet transform and neural network. The images for classification are object images that can be divided into foreground and background. Features for the classification are texture and shape features extracted from wavelet transformed image. The neural network classifier is constrycted with the extracted features and the back-propagation learning algorithm. Among the various texture features, the contrast was more effective.

마이크로파 여기 플라즈마광 생성을 위한 도파관 시스템 설계에 관한 연구

전상재,전후동,송창현,하석영,이승혁,이태호,박의준 금오공과대학교 2005 論文集 Vol.26 No.-

In this paper, the plasma lighting system(PLS) excited by the commercial high power magnetron is developed. The design concepts are based on maximizing the huninous efficacy in conjunction with the miniaturization of waveguide system Furthermore the fine tuning is simplified by using only one stub, and the impedance matching is maximized by introducing the tapering technique. The experimental results show that the luminous efficacy can be dramatically improved by the proposed design method.

청년층의 노동이동에 관한 연구

전재식 한국직업능력개발원 2002 직업능력개발연구 Vol.5 No.1

The purpose of this study is to analyze the factors determining youth employment by examining groups varying in academic achievement and in the major field of study, ultimately to lay a foundation for effective youth employment policy The primary data used in this research is the results of auxiliary survey conducted on youth workforce as part of tile Korean Labor and Income Panel Survey. 3,302 young people of ages between 15 to 29 as of 1 May 2000 participated in the survey, and 1,577 respondents were selected as sample for this research. Different approaches were taken to identify the factors affecting youth employment. first, it was found that the results varied when the sample group was analyzed as a whole and when it was divided into smaller groups by academic achievement and the major field of study. Second, analysis of the sample group divided into different categories produced variation in the sign, size and significance of the variables. The transition of youth from school to work is more difficult than ever as the labor market undergoes dramatic change. Moreover, demand for entry level labor force is diminishing as employers look for more experienced workers. The government policy on youth employment should be based on a concrete assessment of the youth labor market and its changes if it is to be efficient and effective.

Lactobacillus plantarum의 생육 억제에 미치는 요소 및 protoplast 형성에 관한 연구

박범식,--,전억한,조재선 경희대학교 부설 식량자원개발연구소 1993 硏究論文集 Vol.14 No.-

발효중 L.plantarum의 생육 영향 실험은 다양한 인자를 이용하여 결정하였는데 당 종류 및 함량에 따른 성장 효과는 glucose가 20%일때 발효성 당 기질의 활용율이 높았으며, pH 저하 속도 역시 가장 빨랐다. 초기 pH를 6.5에서 3.0까지 acids 첨가로 고정시켜서 초기 pH에 따른 발효중 pH의 변화 정도은 접종 초기 pH와 관계없이 4.0 이하에선 pH 저하가 거의 일어나지 않았으나 세포 농도는 증가하였다. 초기 pH 40 이상에서는 급격한 pH 저하가 있었다. 따라서 acidulants 첨가시 적어도 pH를 40이하로 낮추게 되면 세포 성장이 둔화 되어 김치 발효에 앞서 acididulation을 행할 수 없게 된다. 젖산균의 종류에 따라서 일정농도 이상의 염농도에서 생육이 중지되거나 삼투압이 세포내보다 클때에는 세포가 파열하여 생육할 수 없다. 염농도 1%에서 3%까지 증가함에 따라 세포상장에 어느정도 영향을 미쳤으나 pH저하에는 거의 영향을 미치지 않았다. DEDT와 Butylated hydroxyanisol은 생장 억제제로 각 1%, 0.04% 첨가한 경우 접종초기와 배양후의 pH 변화는 거의 또는 전혀 일어나지 않았으며, Zn을 첨가하였을때도 pH 변화가 발견되지 않았다. Protoplast를 생성하기 위하여 세포벽 용균 효소로 lysozyme 40㎍/ml과 protoplast 형성율이 가장 좋은 생육 시기인 15hr으로 결정하였다. 30℃, ph75에서 현저한 흡광도 감소 경향과 protoplast 형성율도 우수하게 나타났다. 15% sucrose, 20mM MgCl₂, 6mM CaCl₂에서는 흡광도 감소 경향을 보이지 않았으나, protoplast 형성율은 다른 농도에서보다 증가하는 경향을 나타냈다. Plasma expander로 알려진 gelatm을 첨가하였을 경우에는 6660㎚에서 유의적인 흡광도 감소경향을 보이지 않았으며 단지 protoplast를 형성시키는데 있어서 중요한 보조적 역할을 수행하는 것으로 사료된다. Lactic acid bacteria involved in KimChi fermentation was tested for disposition of preservation with initial pH and inhibitory activity against Lactobacillus plantarum. The inhibotory effects of various factors which are additional sugars, lowering initial pH, addition of salts on the cell growth were evaluated by measuring capacity of acid formation. The cell growth was found to be high at 20% glucose in accordance with fast falling of pH. It was revealed that the cell growth was inhibited with some decrease in pH when concentration of salt increased up to 3%. It was also found that Zn concentrations ranging from 0.01% to 0.04% did not show any influence on the cell growth. Microorganisms of L. plantarum were also used for the protoplast fusion to obtain the improved strains for KimChi fermentation. Protoplasts of L. plantarum was produced by lysozyme digestion at 30℃ for 180min. The strain was treated with 40㎍/㎖ of lysozyme in 30 mM Tris-Cl buffer(pH 7.5) containing 10% sucrose at the late logarithmic growth. It was found that the efficiency of protplast formation was high at 30℃, pH 7.5 determined by decrease in absorbance. Optimum concentrarions of sucrose, Ca^(2+), Mg^(2+) for protoplast formation were determined to be 15%, 20 mM and 6 mM, respectively.

젖소 말초혈액 림프구로부터 소백혈병 바이러스 배양 및 전자현미경적 관찰

윤순식,박중원,변재원,강문일,유한상,한홍율 韓國電子顯微鏡學會 2005 Applied microscopy Vol.35 No.1

국내 젖소의 54.2%가 BLV에 감염되어 있지만 현재까지 국내에서는 소백혈병 바이러스 (BLV) 입자를 확인한 연구 보고가 없기 때문에 BLV 항체 양성 소의 말초혈액림프구를 배양, BLV를 발현시켜 전자현미경으로 바이러스 입자를 검출하였고 배양조건에 따른 바이러스 발현율 및 발현 시간을 비교하였다. 검사 결과 전형적인 C-형 바이러스를 확인할 수 있었으며 BLV 단크론 항체를 이용한 면역염색결과 BLV 항원 양성으로 확인되었다. BLV 는 대부분 세포 외부에 분포하고 있었으며 세포질 막에서 생성, 발아되어 나오는 것도 관찰되었다. 전체 바이러스의 크기는 90~100 nm였으며 nucleocapsid는 40~60nm였다. 소태아혈청 (FBS)과 T- 및 B-림프구 분열촉진물질(mitogen)을 각각 첨가하여 배양한 결과 두 군 모두에서 BLV 발현이 확인되었다. Lipopolysaccharide 첨가군은 배양 12시간, Conconavalin A 첨가군은 배양 24시간에 각각 림프구의 10%에서 바이러스가 관찰되었다. 또한 FBS만 첨가한 군과 FBS와 mitogen을 모두 첨가하지 않은 군에서도 관찰되었으나 바이러스의 수는 적었다. 본 연구에서 확립된 BLV 배양 기법을 활용하면 BLV에 감염된 소 중 바이러스를 발현하는 소, 즉 전파능이 있는 개체를 찾아내어 우선적으로 도태할 수 있기 때문에 BLV 감염으로 인한 피해를 막는데 효과적으로 이용될 수 있을 것으로 사료된다. Many studies have been performed on the bovine leukemia virus (BLV) since bovine leukosis had been reported in 1968 in Korea. However, there was no report on the ultrastructural examination of BLV. An attempt to detect C-type viral particles in the cultured peripheral blood lymphocytes of Holstein-Friesian dairy cattle, was made to determine whether in vitro viral expression might be used as a reliable method to identify the cow which is likely to transmit BLV. In transmission electron microscopic (TEM) examination, the virus particles were found predominantly outside of the lymphocytes even though a few particles were also observed within the membrane bound cytoplasmic vacuoles. All of them were C-type particles consisting of a central, electron-dense core separated by a clear area from a limiting envelope with a unit membrane structure. Virus particles were easily detected in the lymphocyte which was cultured with medium supplemented with either T-lymphocyte mitogen (conconavalin A) or B-lymphocyte mitogen (lipopolysaccharide). Identical viral particles, although fewer, were also consistently present in the lymphocytes cultured with medium which was containing foetal bovine serum (FBS) only and which was containing neither FBS or mitogen. By contrast, no virus particle was detected in extensive examination of lymphocytes before culture. In conclusion, the BLV cultivation and detection methods established in this study could be used as a tool to identify and eliminate the cattle which can transmit the BLV.

Resorbable Plates For The Fixation Of Mandibular Fractures: Case Reports And Review Of The Litherature

( Jae Seek You ),( Su Gwan Kim ),( Hak Kyun Kim ),( Seong Yong Moon ) 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.2S

Heat stroke in an American PitBull Terrier dog (pp.536-537)

Jae Hun Jeong,Ji Youl Jung,Sae Mi Lee,Byung Jae So,Soon Seek Yoon 대한수의학회 2015 대한수의학회 학술대회발표집 Vol.2015 No.-

Allergic reaction after injecting a Local anesthetic during dental treatment: a case report (초)

( Jae Seek You ),( Su Gwan Kim ),( Ji Su Oh ) 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.2s

Seroepidemiological Studies of Aino Virus Infection in Korean Cattle

Jae-Jin Cho,Yeun-Kyung Shin,Sora Yoon,Soon-Seek Yoon,O-Soo Lee,Jae-Young Song,Hong-Ryul Han 대한미생물학회 2009 Journal of Bacteriology and Virology Vol.39 No.4

Paranasal augmentation using Medpor implant and changes in lateral profile

( Jae Seek You ),( Su Gwan Kim ),( Ji Su Oh ),( Kyung Seop Lim ),( Seung Min Shin ),( Cheol Man Kim ) 조선대학교 치의학연구원 2013 Oral Biology Research (Oral Biol Res) Vol.37 No.2

Purpose: The purpose of this study was to simultaneously evaluate soft tissue changes induced by bilateral sagittal split osteotomy of the mandible as well as paranasal augmentation using a Medpor® implant based on cephalometric radiography before and 6 months after surgery. Materials and Methods: We analyzed the increase in soft tissue volume in 20 patients diagnosed with mandibular advancement and midfacial depression between Feburary 2005 and Feburary 2009. Paranasal augmentation was performed using a 4.5mm-thick Medpor® implant, and lateral head radiographs were analyzed before and 6 months after surgery. Results: The increase in soft tissue volume was 3.27±1.16 mm, which was 72.67% of the actual thickness. After surgery, no particular complication was detected, and the results were acceptable to the patients and surgeons. Based on these results, the Medpor®implant is a satisfactory artificial graft material for use in facial augmentation. Conclusion: Paranasal augmentation using the Medpor® implant can be considered a good surgical option that can maximize the aesthetics of a patient`s face.