환경조건과 시설이 돼지의 생산성에 미치는 영향(하)

김동균,Kim, Dong-Gyun 대한양돈협회 1989 養豚 Vol.11 No.1

돈육생산비를 절감시키기 위한 첫단계 과제는 사료비를 최소화 하는 것이다. 그런데 현실적으로 사료의 품질과 돼지의 능력은 이미 국제수준에 도달해 있으므로, 사료비의 절약을 위한 현실적인 대책은 사료요구율을 최소 수준으로 유지할 수 있도록 환경을 조성해 주는 것이라 할 수 있다. 따라서 최근 양돈업계에서 크게 관심을 모으고 있는 생산성 향상을 위한 관리요인과 환경적 요소 그리고 시설요인에 대해 4회에 걸쳐 김동균 교수(상지대 축산학과)의 글을 연재하기로 한다

A Study of Microphysical Properties within a Precipitation System Using Wind Profiler Spectra

김동균,김연희,장동언 한국기상학회 2011 Asia-Pacific Journal of Atmospheric Sciences Vol.47 No.5

This study investigates microphysical properties from wind profiler Doppler spectra observed within a precipitation system that produced high rainfall rates up to 40 mm hr−1 near the southern coast of the Korean Peninsula on 25~26 June 2010. A 1290-MHz wind profiler located in the National Center for Intensive Observation of Severe Weather at Boseong, Korea, observed a widespread stratiform region and short-lived convective cells from 1850 UTC 25 to 0200UTC 26 June 2010. By using a spectral model applied to observed profiler spectra, rainfall parameters and raindrop size distributions were retrieved below a melting layer during this period. Three representative periods during precipitation were selected based on intensities of bright band and characteristics in vertical profiles of radar reflectivity and Doppler velocity. During a brief convective period (~30 min), radar reflectivity tended to be proportional to vertical air motion (positive upward), suggesting that updrafts up to ~3 m s−1 over a large vertical extent through the melting layer probably contributed to increasing rainfall rates at the surface. In reflectivityrainfall rate distributions, large drop spectra (high reflectivity) were analyzed within downdrafts and small drop spectra (low reflectivity)within updrafts, similar to the large and small drop spectra but found in stratiform and convective regions, respectively, in previous studies. This indicates that the degree of spread between reflectivity and rainfall rate may be strongly dependent on positive and negative magnitudes of vertical air motion. For three categories of vertical air motion (i.e., updrafts, neutral, and downdrafts), physical relations between the retrieved rainfall parameters were examined.

분산타부서치알고리즘을 이용한 선박충돌방지

김동균,카츠토시히라야마,텐다오키모토 해양환경안전학회 2015 해양환경안전학회 학술발표대회 논문집 Vol.2015 No.04

空中勤務者와 一般勤務者의 體力에 關한 比較 硏究

金東均 空軍士官學校 1987 論文集 Vol.24 No.-

공중근무자와 일반근무자 간의 체격, 체력의 차를 규명하여 공중근무자를 위한 체력육성방안의 기초자료를 제공함을 목적으로 연구를 시도한바 다음과 같은 결론을 얻었다. 1. 신체의 영태적 발육정도를 알아보기 위하여 신체발달의 생리적 과정을 나타내는 중요한 지표로서 가장 기본적인 인체의 길이를 나타내며 성장의 척도가 되는 신장과 신체의 발육상태를 나타내는 체중을 측정 비교한 결과는 두 그룹간 의의있는 차가 없었다. 2. 체력은 신체의 운동능력을 평가하는 요인으로 스피드의 100m Dash, 근지구력의 Sit up, 전신 지구력의 1,500m 달리기 순발력의 스탠딩 브로드 점프, 근력의 pull-pus를 측정하였으며 결과는 100m Dash, 1,500m 달리기, 스탠딩 브로드 점프, pull-ups에서는 의의있는 차가 없었으나 situp의 경우는 매우 의의있는 것으로 나타났다. 이 관계에 대한 후속 연구가 기대된다.

Curcumin inhibits cellular condensation and alters microfilament organization during chondrogenic differentiation of limb bud mesenchymal cells

김동균,김송자,강신성,진은정 생화학분자생물학회 2009 Experimental and molecular medicine Vol.41 No.9

Curcumin is a well known natural polyphenol product isolated from the rhizome of the plant Curcuma longa, anti-inflammatory agent for arthritis by inhibiting synthesis of inflammatory prostaglandins. However, the mechanisms by which curcumin regulates the functions of chondroprogenitor, such as proliferation, precartilage condensation, cytoskeletal organization or overall chondrogenic behavior, are largely unknown. In the present report, we investigated the effects and signaling mechanism of curcumin on the regulation of chondrogenesis. Treating chick limb bud mesenchymal cells with curcumin suppressed chondrogenesis by stimulating apoptotic cell death. It also inhibited reorganization of the actin cytoskeleton into a cortical pattern concomitant with rounding of chondrogenic competent cells and down-regulation of integrin β1 and focal adhesion kinase (FAK) phosphorylation. Curcumin suppressed the phosphorylation of Akt leading to Akt inactivation. Activation of Akt by introducing a myristoylated, constitutively active form of Akt reversed the inhibitory actions of curcumin during chondrogenesis. In summary, for the first time, we describe biological properties of curcumin during chondrogenic differentiation of chick limb bud mesenchymal cells. Curcumin suppressed chondrogenesis by stimulating apoptotic cell death and down-regulating integrin-mediated reorganization of actin cytoskeleton via modulation of Akt signaling.

국제종합기계 채용정보

김동균 한국농업기계학회 2013 상주농업기계박람회 심포지엄 Vol.2013 No.-

원발성 비결핵 1례

김동균,안건영,전경명,오일준 釜算慶南耳鼻咽喉科學會 1993 임상이비인후과 Vol.4 No.2

Vertical Structure and Microphysical Characteristics of Typhoon Kompasu (2010) at landfall

김동균,김연희,정관영 한국기상학회 2013 Asia-Pacific Journal of Atmospheric Sciences Vol.49 No.2

The vertical structure and microphysics of Typhoon Kompasu that caused a lot of damage associated with strong winds and heavy rainfall over the Seoul metropolitan area on 1~2 September 2010 were examined primarily from wind profiler measurements. Four different periods that represent a stratiform, outer rainband, inner rainband, and eyewall region during passage of Typhoon Kompasu from 1200 to 2300 UTC 1 September were selected based on bright band intensities and vertical profiles of radar reflectivities and Doppler velocities. The bright band signatures observed in all of these periods indicated that the structure of Kompasu was basically stratiform in a weakening phase. Maximum rainfall rates up to 50 mm hr−1 at the surface and mean wind speeds greater than 30 m s−1 in the 2-4 km layer were observed in the eyewall region. Unlike the other regions that showed nearly zero vertical air motions or weak downdrafts below a melting layer, a mean updraft of ~1 m s−1 was analyzed only in the eyewall region, which suggests that the updrafts may have enhanced drop growth that led to increasing surface rainfall rates. For each region, the vertical mean characteristics of rainfall parameters retrieved from wind profiler spectra below the melting layer were also examined. The rain properties between the inner and outer rainband were similar although they were apart with a distance of more than 100 km (> 2 hrs in time). The averaged mass-weighted mean diameters within the rainbands were larger than those in the stratiform and eyewall regions. A weaker bright band in the eyewall region suggests the presence of a relatively larger number of rimed particles associated with the updrafts around the melting layer. A stronger bright band was present in the rainbands, which indicates more active aggregation right above the melting layer.

알루미늄 양극 산화막 형성 시 플라즈마 전처리 효과

김동균,김명원 한국물리학회 2015 새물리 Vol.65 No.5

In order to obtain a high dielectric capacitor for micro-electronics applications, we fabricated Al2O3 films by using an anodic aluminum-oxide nano-template method. The surface was examined by using Filed-emission scanning electron microscopy, which showed that aluminium was oxidized to form honeycomb-shaped aluminium-oxide nano-tubes. The capacitance depended on the surface area, so we tried to widen the nanotube’s hole. A previous work showed that the initial surface state was important for the formation on growth of a nanotube, so we exposed the aluminum foil to a 1 keV argon-ion plasma before anodic oxidation. This pre-treatment increased the hole size from 50 nm to 100 nm and increased the capacitance from 0.23 μF/cm2 to 0.35 μF/cm2 by about one and half times compared to that for the nanotubes formed from the aluminum not exposed to the argon beam. The dielectric constant of the Al2O3 films made by using an anodic aluminum-oxide nano-template was increased by using an argon-ion pre-treatment, which induced a widening of the holes through surface modification. 본 실험에서는 양극산화 알루미나 나노 템플레이트 기술을 이용하여 커패시터를 제조하여 유전 특성을 조사하였다. 나노 튜브의 형태 및 크기는 원박의 초기 조건에 의존한다는 사실이 알려져 있다. 따라서 본 연구에서는 원박을 아르곤 플라즈마로 전 처리한 후 나노 템플레이트 방법으로 양극산화 실험을 하였다. 알루미늄 박막에 플라즈마 전 처리한 후 양극 산화막을 만들 경우 기공의 밀도 및 튜브의 깊이가 길어져 유전 용량이 증가함을 확인하였다. 일차 양극산화로 형성된 기공은 불규칙적이고 크기는 대략 50 nm이었다. 반면 1 keV 로 전 처리한 시료는 기공이 원형에 가까우며 크기는 대략 100 nm 정도 되었다. 유전 용량도 0.23 μF/cm2에서 0.35 μF/cm2 으로 증가함이 나타났으며, 이는 아르곤이온으로 인한 스퍼터링이 알루미늄 기판에 표면 전처리 효과를 발생시켜 쉽게 기공을 확장 시키는 효과를 가져 왔음 확인 할 수 있었다.

Longitudinal patterns in limnological characteristics based on long-term ecological research in the Nakdong River

김동균,홍동균,김현우,주기재,정광석 한국생태학회 2011 Journal of Ecology and Environment Vol.34 No.1

In 2004, the Korean Ministry of Environment initiated the National Long Term Ecological Research (LTER) program. We have attempted to analyze longitudinal patterns in limnological aspects based on LTER monitoring data collected from June 1994 to May 2008 in the Nakdong River, a regulated river ecosystem. Factor analysis, a multivariate ordination statistical method, was employed. Relationships among measured parameters were evaluated at different sites of the river. Overall, the trophic state of the Nakdong River was hyper-trophic (total nitrogen, 3.5-4.8 mg/L; total phosphorous, 57-95 μg/L; chlorophyll a, 15.2-38.5 μg/L). Among the three study sites, recurrent algal blooms consistently appeared in the lower reaches of the river. Extracted factors revealed different patterns, particularly for chlorophyll a concentration, and a rigid separation of limnological patterns was found at site 3 (Mulgeum) based on the factor analysis. From the results, more sustained observations through LTER will be helpful to manage and conserve ecosystems in the future. Furthermore, recent issues regarding ecosystem dynamics such as water quality with respect to global climate change require long-term datasets. Information collected by the LTER approach is hereby indispensable for ecological characterization.