측정방법에 따른 국내산 산양유의 체세포수 비교

이승규,김민경,이연정,정석근,오미화,김동훈,박광욱,이완규,함준상,Lee, Seung-Gyu,Kim, Min-Kyung,Lee, Yeon-Jeong,Jeong, Seok-Geun,Oh, Mi-Hwa,Kim, Dong-Hun,Park, Kwang-Wook,Lee, Wan-Kyu,Ham, Jun-Sang 한국축산식품학회 2010 한국축산식품학회지 Vol.30 No.1

산양유의 체세포수는 측정방법에 따라 많은 차이가 보고되고 있으나 국제적인 표준방법으로 pyronin Y-methyl green stain에 의한 직접현미경법이 사용되고 있다. 8개 목장 총 48개 시료를 pyronin Y-methyl green stain에 의한 직접검경법, 국립축산과학원에서 보유중인 ADAM-SCC, 충청북도 축산위생연구소에서 보유중인 Somacount 500으로 측정하여 결과를 비교하였다. Pyronin Y-methyl green stain 측정시 전체 평균은 $7.3{\times}10^5$ cells/mL인 반면 ADAMSCC와 Somacaount 500은 각각 $4.9{\times}10^5$과 $11.6{\times}10^5$ cells/mL로 나타나 과소 또는 과대평가되는 결과를 보였다. 직접현미경법과 ADAM-SCC또는 Somacaount 500과의 상관계수는 각각 0.0332 또는 0.2285로 매우 낮으며 장비간의 상관계수도 0.1552로 매우 낮게 나타났다. 산양유의 체세 포수 저감을 위해서는 측정장비의 개발이 필요하며 장비를 표준화하기 위한 표준측정법으로 pyronin Y-methyl green stain의 채택이 필요하다.

위성/이동 통신 시스템에서의 가상화 기술 동향

이승규,이준환,이문식,S.Q. Lee,J.H. Lee,M.S. Lee 한국전자통신연구원 2024 전자통신동향분석 Vol.39 No.1

Virtualization technology supports the execution of software unrelated to the hardware environment through the decoupling of software and hardware. Additionally, it enables network slicing, allowing one physical device to be divided and used by a function or service by supporting sharing with isolation. Virtualization enables flexible platform use, allowing a variety of services to be launched without changes or additions to the hardware platform. We describe virtualization technology trends in satellite/mobile communication systems. Basic concepts and technical definitions are included, and the current status of research and development by domestic and foreign organizations, including the Electronics and Telecommunications Research Institute, is analyzed. Finally, future prospects and implications are discussed.

한국산 뚱보바수염반날개속의 분류학적 연구

이승규,안기정,LEE, Seung-Gyu,AHN, Kee-Jeong Korean Society of Applied Entomology 2015 한국응용곤충학회지 Vol.54 No.1

한국산 미기록 속인 뚱보바수염반날개속(Thamiaraea Thomson) (신칭)의 2종-큰뚱보바수염반날개(T. diffinis Sharp) (신칭)와 뚱보바수염반날개(T. japonica Cameron) (신칭)-을 한반도에서 처음으로 보고한다. 이 2종에 대한 검색표, 재기재, 및 식별형질에 대한 그림을 제시한다. A taxonomic study of the genus Thamiaraea Thomson in Korea is presented. The genus and its two species (T. diffinis Sharp and T. japonica Cameron) are new to the Korean Peninsula. A key, redescriptions and illustrations of diagnostic characters are provided.

필터링된 잔차를 이용한 희박벡터자기회귀모형에서의 변수 선택 측도

이승규,백창룡,Lee, Seungkyu,Baek, Changryong 한국통계학회 2015 응용통계연구 Vol.28 No.5

벡터자기회귀모형은 다차원의 시계열 자료간의 선형종속 관계를 연구하는데 효율적인 모형이다. 하지만 차원이 높아질 경우 추정해야할 모수가 급격히 증가하여 추정이 불안정해지고 예측력의 저하 및 해석의 어려움을 동반하는 문제를 가지고 있다. 이를 보완하기 위해서 많은 계수를 0으로 두는 희박벡터자기회귀모형이 제안되었고 고차원 시계열 분석에서 유용함이 밝혀졌다. 이 논문에서는 희박벡터자기회귀모형 추정에 있어서 어떠한 계수를 0으로 두어야 하는지를 판단해주는 한 쌍의 변수에 대한 상관 정도를 추정해주는 커플링 측도를 제안한다. 먼저 이 논문에서는 부분 스펙트럼 일관성에 기반을 둔 커플링 측도를 사용한 변수 선택의 경우 다른 변수의 효과를 제거한 잔차에 기반을 두었기에 좋은 효율성을 보임을 밝힌다. 하지만 부분 스펙트럼 일관성의 경우 벡터자기회귀모형 계수의 비대칭성을 고려하지 못한다는 단점이 있어 이를 보완하고자 필터링을 통해 다른 변수의 효과를 제거한 잔차에 기반을 둔 동시에 비대칭성을 가지는 커플링 측도들, 필터링된 잔차를 이용한 교차 상관성과 그래인저 인과관계를 제안한다. 모의실험을 통해 우리가 제안한 방법론들이 두터운 꼬리를 가지거나 높은 차수의 희박벡터자기회귀모형의 경우에도 매우 정확하게 0이 아닌 변수를 선택함을 보인다. Vector autoregressive (VAR) models in high dimension suffer from noisy estimates, unstable predictions and hard interpretation. Consequently, the sparse vector autoregressive (sVAR) model, which forces many small coefficients in VAR to exactly zero, has been suggested and proven effective for the modeling of high dimensional time series data. This paper studies coupling measures to select non-zero coefficients in sVAR. The basic idea based on the simulation study reveals that removing the effect of other variables greatly improves the performance of coupling measures. sVAR model coefficients are asymmetric; therefore, asymmetric coupling measures such as Granger causality improve computational costs. We propose two asymmetric coupling measures, filtered-cross-correlation and filtered-Granger-causality, based on the filtered residuals series. Our proposed coupling measures are proven adequate for heavy-tailed and high order sVAR models in the simulation study.

라섹과 에피라식의 단기간 임상결과 분석

이승규,김선웅,김태임,이형근,김응권,서경률.Seung Kyu Lee. M.D.. Sun Woong Kim. M.D.. Tae Im Kim. M.D.. Hyung Kuen Lee. M.D.. Eung Kweon Kim. M.D.. Kyoung Yul Seo. M.D. 대한안과학회 2008 대한안과학회지 Vol.49 No.3

`Purpose: To compare short-term clinical results of LASEK and epi-LASIK. Methods: Fifteen subjects (30 eyes) underwent uncomplicated LASEK on one eye and uncomplicated epi- LASIK on the other eye by a single surgeon, and uncorrected visual acuity, refractive change, postoperative pain, and postoperative satisfaction were compared at postoperative week one, at one month, and at three months. Results: Postoperative uncorrected visual acuities were 0.68±0.20, 0.96±0.22, and 1.05±0.17 for LASEK and 0.75±0.21, 0.92±0.14, and 1.01±0.21 for epi-LASIK at one week, one month, and three months, respectively. Epi-LASIK showed faster improvement in visual acuity at one week, while LASEK showed faster improvement afterward. However, no statistical significance was found. Spherical equivalet of LASEK was -0.66±1.28D and that of epi-LASIK was -0.61±0.92D at postoperative week one, implying faster refractive recovery for epi-LASIK, but after one month, LASEK was faster in refractive recovery and all these changes were not statistically significant. Durations of postoperative pain were 3.13±1.25 days for LASEK and 3.02±1.32 days for epi-LASIK. Pain scores (0~10 point scale), however, were also lower for LASEK by 0.33 point, 0.57 point, and 0.45 point for postoperative day 1, 2, and 3, respectively. No statistical significance was noted in either pain duration or pain score. When asked for overall satisfaction, six subjects preferred LASIK, four subjects preferred epi-LASIK, and five subjects showed no preference. Conclusions: Both LASEK and epi-LASIK are effective for surgical correction of myopia, and no significant difference in visual recovery, refractive change or degree of postoperative pain was noted in this study.`

악기능장애 환자의 교합재구성에 있어서 중심위와 새로운 치료과두위의 중요성

이승규,이성복,최대균,Lee, Seung-Gyu,Lee, Seong-Bok,Choe, Dae-Gyun 대한턱관절교합학회 2001 구강회복응용과학지 Vol.19 No.2

교합조정이나 대부분의 보철치료는 비가역적이어서 명확한 치료 계획이 없이는 섣불리 치료를 시작하지 말아야 한다. 명확한 치료 계획을 위해서는 증상의 원인 인자를 파악해야 하나, 때때로 그 원인이 불분명하여 환자에게 무어라 설명해야 할지 난감한 경우가 많은 것이 바로 이 분야이다. 교합 재구성을 함에 있어서 생체 역학과 근육의 활동량을 고려해야 하는 것은 이미 주지하고 있는 바이다. 즉, 악관절이나 치아에 대한 하중을 조절함으로써 근조직의 안정을 도모하여 적정한 하악위와 원활한 하악운동을 획득하는 것이 교합 재구성의 큰 목적 중 하나이다.

김치에서 분리한 Lactobacillus plantarum LHC52의 항균활성과 요구르트의 관능성 연구

이승규,한기성,정석근,오미화,장애라,김동훈,배인휴,함준상,Lee, Seung-Gyu,Han, Ki-Sung,Jeong, Seok-Geun,Oh, Mi-Hwa,Jang, Ae-Ra,Kim, Dong-Hun,Bae, In-Hyu,Ham, Jun-Sang 한국축산식품학회 2010 한국축산식품학회지 Vol.30 No.2

The aim of our study was to develop a new starter culture for fermented milk. Polymerase chain reaction screening of 103 acid-producing isolates from Kimchi identified 72 Lactobacillus strains. The ability of the strains to inhibit the growth of the food-borne human pathogens (Escherichia coli, Salmonella Enteritidis, Staphylococcus aureus) was measured, using a conventional paper disk method. Among the 72 strains, strain LHC52 displayed potent antagonistic activity. Use of 16S rDNA sequencing and the API 50CHL system identified the strain as Lactobacillus plantarum and it was designated L. plantarum LHC52. Biochemical analyses revealed especially high antibacterial activity against E. coli. Yogurt produced using L. plantarum LHC52 did not show different microbiological and physicochemical properties compared to conventionally-prepared yogurt, implicating L. plantarum LHC52 as a useful, potently antibacterial starter culture for yogurt preparation.

피목가지마름병(Cenangium twig blight)이란 무엇인가?

이승규,Lee, Seung-Gyu 한국수목보호연구회 2001 수목보호 Vol.6 No.-

산소중독에 대한 Vitamin E의 보호효과에 관한 실험적 연구

이승규,이상일,조수헌,윤덕로,Lee, Sung-Gyu,Lee, Sang-Il,Cho, Soo-Hun,Yun, Dork-Ro 대한예방의학회 1986 Journal of Preventive Medicine and Public Health Vol.19 No.2

Since the wide spread application of hyperbaric oxygenation in clinical setting, the problems of oxygen toxicity have been attracting a deep interest from the researchers on hyperbaric medicine as a practical issue. Among extensive research trials, the study on the protective agents against oxygen toxicity occupied one of the most challenging field. As the mechanisms of oxygen toxicity, the role of the oxygen free radicals produced by peroxidation process are strongly accepted by the leading researchers on oxygen toxicity, the probable protective effects of antioxidant against oxygen toxicity are sustaining a sufficient rationale. In this study, the author attempted to evaluate the effect of vitamin E as a protective agent against oxygen toxicity through the observation of death rate, convulsion rate, time to convulsion, and macroscopic and microscopic pathological changes of experimental rats exposed to 100% oxygen at 5 ATA for 120 minutes. The findings observed are as follows: 1) The death rate, convulsion rate, time to convulsion, organ/body weight ratio and microscopic pathological findings were identified as reliable objective and quantitative indices for oxygen toxicity. 2) Vitamin E showed excellent protective effects against CNS and pulmonary oxygen toxicity as a strong antioxidant. The most effective dose seemed to be around 400 mg/kg 3) The results of this study are supporting the oxygen free radical hypothesis on oxygen toxicity.

마늘즙 첨가 요구르트의 품질특성 및 항생제 저항성 황색포도상구균 KCCM 40510 억제활성

이승규,이연정,김민경,한기성,정석근,장애라,채현석,김동훈,함준상,Lee, Seung-Gyu,Lee, Yeon-Jung,Kim, Min-Kyung,Han, Gi-Sung,Jeong, Seok-Geun,Jang, Ae-Ra,Chae, Hyun-Seok,Kim, Dong-Hun,Ham, Jun-Sang 한국축산식품학회 2009 한국축산식품학회지 Vol.29 No.4

This study was carried out to fortify the antimicrobial activity of yogurt by adding garlic juice to it. A raw garlic bulb was grated and heated with Glycyrrhiza uralensis to improve its antimicrobial activity and palatability. Yogurt was made with 0, 4, 8, and 12% garlic juice, and was evaluated in terms of its lactic starter growth, physico-chemical characteristics, growth inhibitory activity against Staphylococcus aureus KCCM 40510, and sensory characteristics. The garlic juice significantly increased the growth of the yogurt starter (p<0.05), which was highest with the addition of 4% garlic juice. Significant (p<0.05) inhibition of S. aureus KCCM 40510 occurred with the addition of 12% garlic juice. The preference was lowered with the addition of garlic juice, but the addition of 4% garlic juice showed no significant difference (p>0.05). To increase the antimicrobial activity of yogurt with the addition of garlic juice, further studies on the increase in the palatability of garlic juice are necessary.