한국의 낙농시설 개선에 관한 연구

김문기,고재군,김현욱,Kim, Moon-Ki,Koh, Chae-Koon,Kim, H. U. 한국농공학회 1982 한국농공학회논문집 Vol.24 No.1

Engineering phase of dairy housing systems has close connection with the milk produc- tivity of dairy cattle, the quality of milk, extension of dairy production systems, labor- saving in management of dairy cattle and the like. Moreover, the rate of investment of dairy housing facilities is of relatively high level, However, there has been almost no research effort for the improvement of engineering aspects of dairy housing systems in Korea. The purpose of this study is to find out general engineering problems and to recomm- end the improvement in dairy housing systems in Korea. Field survey by means of questionaire, direct measurements, taking pictures and sketching was conducted to get necessary information for the study. Kyung-ki Do region was firstly chosen for sampling area since it has included more than half of the number of dairy farms of the whole country. The results obtained are summarized as follows: 1. In overall dairy farm layout, the dwellings of workers were ignored in the light of sanitary environment 2. The layout of stalls in a dairy barn belongs mostly to the type of double-row face-out, which is compatible with the emphasis of manure disposal activities. 3. While the width and length of stalls were sufficiently close to the standard dimension, the width of mangers was much less than the standard dimension. 4. The width and depth of manure gutters and the width of working alleys were much. less than the standard dimension. 5. The mooring equipment was mostly in the classes of chain or rope. The watering equipment was not facilitated independantly except the one cese of using watercup. 6. The bucket milkers with one or two bucket milkers with the capacity of two cattles. each were used as milking equipment in most dairy farms. 7. There were only few milk rooms independently spaced from other space, in which the arrangement of milking equipment was much less than the standard condition. 8. The lounging ground area was averaged to be sufficient for the activity of dairy herd. 9. Silos for silage used during winter consisted of mostly bunker silos, trench silos and underground vertical silos. Ordinary vertical silos were considered for the farmers to be inconvenient for the labor saving. 10. From the view point of heat conservation and moisture removal within the dairy barns, windows were not flexible for the easy ventilation and ceiling part was not adequate for temperatur maintenance. 11. Waste treatment and disposal systems were not provided with most dairy farms, therefore the livestock waste pollution problems would be serious in the near future.

유한요소법(有限要素法)에 의(依)한 Telescope Denture의 지대치(支臺齒) 및 지지조직(支持組織)의 역학적(力學的) 반응(反應)에 관(關)한 연구(硏究)

김문기,최부병,Kim, Moon-Ki,Choi, Boo-Byung 대한치과보철학회 1984 대한치과보철학회지 Vol.22 No.1

The purpose of this study was to analyze the magnitude and mode of the stress distribution induced in the supporting alveolar bone and periodontal ligament and, to determine the displacement of abutment teeth and telescope denture base by applying chewing force to the telescope denture quantitatively and qualitatively. Two finite element models of telescope denture that were restored the missing mandibular second molar with two abutment teeth which were constructed. In two different models, parallel and tapering type telescope crowns were constructed. These finite element models of two cases used for these experiment were a two-dimensional mesiodistal section of the mandibular second bicuspid and first molar. Chewing force of 25Kg that was devided in the ratio of 45/155 (29%) in bicuspid and 55/155 (35.5%) in molars was applied to telescope denture and abutment teeth respectively. The displacement of the telescope denture base and abutment teeth and the stress distribution in the periodontal ligament and alveolar bone were analized to investigate the influence of chewing force acting on the telescope denture and abutment teeth. The results were as follows: 1. Abutment teeth displaced mesially and the magnitude of displacement of abutment teeth in vertical direction were more than that of horizontal direction in two cases. The displacement of abutment teeth on the telescope denture treated with tapering type telescope crown were less than that of the parallel type crown. 2. The displacement of the telescope denture base that were treated with parallel type telescope crown were less than that of treated with tapering type telescope crown. 3. The stress induced in the alveolar bone and periodontal ligament on abutment teeth that treated with parallel type telescope crown were more than that of treated with tapering type telescope crown and more stress induced in the alveolar bone than in the periodontal ligament. 4. In the telescope denture, the magnitude of displacement of abutment teeth and stress induced in the periodontal ligament and alveolar bone were within physiologic limit.

몬테카를로 모사를 이용한 동압력 교정기 불확도 평가

김문기,Kim, Moon-Ki 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.4

This paper describes Monte Carlo Simulation(MCS) to assess the uncertainty of dynamic pressure calibrator and the expanded uncertainty results that were compared by GUM approximation and MCS. MCS uncertainties were computed using defining a domain of possible inputs, generating inputs randomly using probability distribution, performing a deterministic computation repeatedly and aggregating the results. It was revealed that the expanded uncertainty between GUM and MCS was different from each other. the expanded uncertainties were 0.5366%, 0.4856%, respectively. MCS is a suitable method for determining the uncertainty of simple and complex measurement systems. It should be more widely used and studied in measurement uncertainty calculations.

TinyOS 를 이용한 홈 네트워크용 실시간 조도 모니터링 시스템

김문기 ( Moon-ki Kim ),한병희 ( Byung-hee Han ),김지홍 ( Ji-hong Kim ),김용현 ( Yong-hyun Kim ),이수용 ( Soo-yong Lee ),홍윤식 ( Yun-sik Hong ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.1

TinyOS 기반 무선 센서 노드를 사용한 실시간 계측 데이터 측정 및 제어 기술은 특히 홈 네트워크 분야에 널리 적용되고 있다. 본 논문에서는 ATMega128L을 장착한 최소 8대 이상의 Micaz Mote 센서 노드 모듈을 사용하여 각 방의 조도 값을 실시간 측정하는 시스템을 구현하였다. 특히 TinyOS에서 제공되는 OscilloscopeRF의 메시지 구조를 분석하여, 각 노드의 ID및 계측 데이터를 추출하였다. 또한 이렇게 추출된 계측 데이터를 센서 네트워크의 싱크 노드로부터 데이터 통제 센터(Doc)로 효율적으로 전송하기 위한 TCP 기반 네트워크 프로그래밍을 구현하였다. 실험 결과 센서 노드 수 및 샘플링 주기에 상관없이 안정적으로 계측 데이터 수신이 이루어짐을 확인하였다. 한편, IEEE802.11a/g 기반 무선 네트워크를 통해 실시간 계측 상황을 휴대용 단말기인 PDA에서 확인할 수 있도록 이를 구현하였다.

실제 선로조건에서의 레일 경좌 변화에 따른 철도차량의 주행안전성 해석

김문기(Moon Ki Kim),엄범규(Beom Gyu Eom),이희성(Hi Sung Lee) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.11

현재 국내선로에서 운전규정에 따른 곡선반경별 속도제한을 실행하고 있으나 기존선 속도 향상과 관련하여 실제로 탈선 발생 없이 운행 가능한 곡선부 최대 통과속도에 대한 연구가 필요하다. 또한, 철도차량의 주행안전성에 영향을 미치는 요인으로서는 차량측면과 궤도측면으로 나눠질 수 있는데, 본 연구에서는 탈선 안전도 향상에 영향을 미치는 매개변수 중 레일 경좌 변화에 따른 주행안전성을 해석하고자 하였다. 탈선의 위험도가 높은 곡선부 통과하는 열차의 고속향상을 도모하기 위하여 실제 선로조건인 남성현↔청도 상ㆍ하행 구간의 곡선부 구간별 통과시 레일 경좌와 주행속도 변화에 따른 주행안전성 해석을 수행하였다. Railways are currently subject to the enforcement of speed limits for each curve as prescribed by the Railway Operating Rules in Korea. However, research is required to determine the maximum speed of trains passing through each curve that allows them to run without the risk of derailment in relation to the speed enhancement of existing railway tracks. In addition, factors affecting the running safety of railway vehicles can be classified into those in terms of vehicle aspects and those in terms of track aspects. This study sought to analyze the running safety of railway vehicles according to changes in the inclination of the rail from among the factors affecting the enhancement of safety against derailment. To increase the speed of trains passing through curves that have high derailment risk, this study also analyzed the running safety of railway vehicles according to the inclination of the rail and changes in running speed while a vehicle passes through each curve section in both the up and the down train line sections between Namsunghyun and Chungdo, which represent the actual conditions of railway tracks.

탄소섬유보강을 통한 금속 창호 개발에 관한 기초적 연구 - 경제성과 안정성 분석을 중심으로 -

김문기(Kim, Moon-Ki),유무영(Yoo, Moo-Young) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2

The purpose of this study is to increase the economic feasibility and workability of metal windows, which are materials of curtain wall construction methods used for high-rise buildings in large cities, by utilizing carbon fibers. Based on structural and economic aspects, the carbon fiber reinforcing windows and steel reinforcing windows were evaluated after comparative analysis. Carbon fiber reinforcement windows were assessed to be more stable than steel reinforcement windows by 16%, cost reduction by 15%, and weight reduction by 23%. Therefore, it was evaluated that carbon fiber reinforcement windows are superior to steel reinforcement windows in economic feasibility and construction.

호소수내 녹조의 색도 및 탁도 제거를 위한 AOP 적용성 평가

김문기 ( Moon Ki Kim ),주현종 ( Hyun Jong Joo ),김성철,최정수 ( Jung Soo Choi ),김사동 ( Sa Dong Kim ) 한국물환경학회 2006 공동 추계학술발표회 Vol.2006 No.-

케이블로 지지(支持)하는 공기팽창식(空氣膨脹式) 플라스틱 온실(溫室)의 구조상(構造上)의 분석(分析)

김문기 ( Moon Ki Kim ) 한국농공학회 1972 韓國農工學會誌 : 전원과 자원 Vol.14 No.4

공기 팽창식 이중 플라스틱 온실이 집약 농업 생산에 있어서 그 이용도가 증가되고 있다. 낮은 압력 (0.25인치 H₂O)의 공기를 이용하여 이중 플라스틱 막층을 분리시키는 개념은 플라스틱 덮개를 고착시키는데 효과적인 방법을 가능케 하였다. 어떤 형태로던 온실에 있어서 구조체의 부재의 양을 줄인다든가 간소화 하는것은 온실내부에 그늘진 부분의 면적이 줄어든다는 것과 구조물의 초기 비용을 덜어준다는 점에서 이중의 효과를 얻게 된다. 최근에 개발된 시험적인 케이블 지지, 공기 팽창식 플라스틱 덮개와 여러가지 구조 요소의 하중, 응력, 변형 등의 해석을 다루었다. 첫째, 지붕을 이루고 있는 플라스틱 덮개의 처짐량을 계산하는 공식을 개발하였다. 지붕단면의 모양을 긴 원통의 단면으로 가정함으로써 단면의 기하학과 플라스틱 막응력을 추정할 수 있게 하였다. 둘째, 팽창된 이중 플라스틱막을 온실 내부에서 지지하기 위하여 사용된 케이블의 초기 인장과 팽창압력에 따른 최종 인장력 및 변형 처질을 해석하여 근사 관계식을 개발하였다. 셋째, 케이블 대용으로 개발된 3/4인치 강파이프의 사용이 제시되었고 따라서 하중과 양단 조건에 따른 응력 및 변형 처짐을 계산하여 설계에 사용할 수 있는 공식들을 제공하였다. 넷째, 풍하중이 온실 시스템 전체에 미치는 영향을 재래적인 방법에 의하여 추정하였고 그 결과가 실제적으로 경험할 수 있는 결과와는 상당한 차이가 있음을 지적하였다. 플라스틱 온실 설계에 있어서 관건이 되고 있는 플라스틱 덮개, 지지 케이블 및 지지 강파이프등의 실제 하중 조건 및에서의 변형의 일부를 측정함으로써 개발된 추정공식들이 설계 목적상 이용이 가능함을 보여주고 있다.

實驗的 佝僂病 白鼠의 象牙質 石灰化에 關한 硏究

金文起(Moon Ki Kim) 대한치과의사협회 1985 대한치과의사협회지 Vol.23 No.6

자연환기 온실의 환기회수에 따른 포그냉방시스템의 냉방효과

Kim Moon-Ki(김문기),Kim Kee-Sung(김기성),Kwon Hyuck-Jin(권혁진) (사)한국생물환경조절학회 2001 생물환경조절학회지 Vol.10 No.1