Signal fire was a communication system which deliver urgent news by smoke and light. It informed the condition of the border to the central government and the military base rapidly. This research was to analyze the border signal-fire which is the main facility of military protective duty for safety of sea side in chosun dynasty. The results of this research were described separately as follows. 1. The border signal-fire has three types of facility layout, The majority was one-site, near two-site, separate type. The majority was near two-site type. 2. Plan configuration of signal-fire stand which is separated with circle, oval, round-rectangular and rectangular type roughly was constructed with circle type generally. Four types of signal-fire stand was observed in southern and western sea side impartially. However, in eastern side, circle type of signal-fire stand was mainly found. Therefore, regional characteristics could be considered partially. 3. The height of signal-fire stand was about 8～10m. The diameter of combustion chamber on the signal-fire stand was 2～3m in circle type, and the dimension of rectangular type was about 1.9×1.9～3.2×3.0m. 4. Building base that protect ground moisture and infilteration of rainfall was found in 10 border singal-fire, the height of it was about 0.3m～2.5m.

In this study, copper vapor chambers with built-in cooling fins, which eliminated the soldered or brazed joints in the conventional vapor chamber, were fabricated using the metal injection molding process. The results show that with optimized molding parameters, fins with an aspect ratio up to 18 could be produced. After sintering, the densities of the fin and chamber reached 96%. With only 32 cooling fins and a small fan installed, the thermal resistance of the heat sink was 1.156 ℃/W, and the power dissipation was 40W when the junction temperature was 70℃. When copper powder was sintered onto the chamber to make a vapor chamber, the thermal resistance decreased to 1.046℃/W.

A ventilation system comprising a dielectric barrier discharger and UV‐TiO2 photocatalyst filters was designed and tested for simultaneous removal of gaseous and particulate contaminants in a test chamber. The DBD was used as the 1st stage of ESP for particle charging and gas decomposition. Charged particles were collected in the 2nd stage of ESP by an applied DC electric field. The UV‐TiO2 photocatalyst filters were used for decomposing gaseous species including O3 which was inherently produced by the DBD. Particle removal efficiencies based on mass and number were approximately 83.0% and 88.8%, respectively, after the ventilation system was operating for 5 hours. HCHO removal efficiency was approximately 100% for 1∼5ppm of upstream concentration condition. TVOC removal efficiency was 99.0% and 99.6% for 1 ppm and 5 ppm of upstream concentration conditions, respectively.

Fe nanopowders were successfully synthesized by plasma arc discharge (PAD) process using Fe rod. The influence of chamber pressure on the microstructure was investigated by means of X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM), Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The prepared particles had nearly spherical shapes and consisted of metallic cores (a-Fe) and oxide shells (FeO), The powder size increased with increasing chamber pressure due to the higher dissolution and ejection rate of H and gas density in the molten metal.

강관이 매설되어 있는 폐쇄형 시스템에서 동결된 화강토의 온도분포에 관한 수치해석 및 실험적 연구가 수행되었다. 실험을 통해 측정된 부동수분량의 온도상관식을 제시하였으며, Lachenbruch의 열전도율 식을 사용하여 열전도율 측정값을 비교분석하였다. 원형 단면 강관이 매설된 모형토조의 동결챔버를 제작하여 동결토의 온도를 측정하고 유한요소 수치해석을 수행하여 실험 결과와 비교하였다. 수치해석시 동결된 화강토의 잠열효과가 고려되었다.

Orbscan Topography System 및 A - scan Ultrasonography로 전 방깊 이 훌 측정 하 여 두 기 기 의 신 뢰 도를 평 가하고， A - scan Ultrasonography률 gold standard로 간주 하여 Orbscan Topography System으로 측정한 전방깊이 값의 정확도를 분석하였다. 20안올 대 상으로 Orbscan Topography System 및 A - scan Ultrasonography롤 이 용 하여 측정한 test 와 retest 차이에 대한 평균값은 각각 0.030 :t 0.150 mm와 0.016:t 0.065mm 였다. 또한 54안을 대상으로 Orbscan Topography System과 A - scan Ultrasonography로 측정한 전방깊이 값의 평균은 각각 3.200:t 0.302 mm와 2.999:t 0.239mm로， Orbscan Topography System 측정 값이 더 높았으며 (t = 10.α)3， p<O.αX)1)， 두 기기의 측정값 사이에 높은 상관관계가 있었다 (r = 0.824, p<O.OOül). Orbscan Topography System 측정값을 A - scan Ultrasonography 측정값과 직접 비교하기 위해서는 환산공식이 필요하다.

Experimental studies on the characteristics of annular jet pump were carried out in this paper. Jet pump can be used widely for the transportation of solid materials, farm produce and fishes. The effects of high pressure chamber on the characteristics of annular jet pump were sought in this paper. Experiments were done for three shapes of high pressure chamber, and for several lengths of the high pressure chamber. Three types of the high pressure chamber's entrances(90˚ single inflow, 45˚single inflow, and 45˚ double inflow) were tested. Water was used for both the primary fluid and secondary fluid. The results obtained in this study are as follows; 45˚double inflow type is the most effective among the tested three types of the high pressure chamber's entrances. The efficiency of jet pump with 400mm of high pressure chamber length is the highest among the chamber lengths tested in this study, thus indicating appropriate chamber length is required to get an efficient.

동계 시설내 온도 및 광도가 고추의 생장에 미치는 영향을 알기 위하여 생장상내에서 인공적으로 온도 3수준(10, 20 및 30℃)과 광도 3수준(5, 15 및 25klux)을 7주간 조합 처리한 결과 나타난 생장반응은 다음과 같다. 1. 생장상내에서 고추 시묘의 초장, 엽면적 및 건물중의 생장은 30℃×25klux 처리구에서 가장 양호했고, 각 온도에서도 광도의 증가에 따른 생장의 증가반응이 뚜렷하였다. 2. 처리후 7주째의 생장량을 multiple regression polynomial로 수식화한 결과 초장, 엽수, 엽면적, 경건물 및 지하부 건물중은 수식고정이 적합하였다. 3. 지상부 건물중에 대한 다중 회귀식을 광도와 온도로 편미분한 이론치를 이용하여 단위온도 증가에 대한 단위광도의 향상도와 단위광도 증가에 대한 단위온도 증가의 반응표면을 도식화한 결과 저온화에서의 광도증가는 지상부 건물중 증가반응의 향상도를 크게 높였으나, 광도 10k1ux이하나 온도가 20℃이상에서는 온도의 역할이 더 크게 나타났다. 단위광도 증가에 대한 온도반응의 증가에서도 동일한 경향으로 나타나 온도와 광도의 강한 상보성을 나타내었다.

This paper describes the development of moving watched chamber. For the most part, the watched chamber have been located in the inner-bay. But, there are many problems of sea-water pollution. Therefore, the watched chamber must be relocated to undeveloped coastal area. The watched chamber which is located in the bay has a bit of damage by bad weather. But, the moving watched chamber would be exposed to bad water. It is desirable to improve the system of chamber. If we make a good design of the moving watched chamber with studying of waves and hydrodynamics, it would be possible to culture fish at the coastal sea area. When a fixed system is changed into a movable one, we can obtain the following advantages: 1. The possibility of diminishing the sea water pollution, easying the overcrowded state in a inner-bay farm, and relieved of limitation caused by bad conditions such as waves, red tides and terrains. 2. It would be easy not only to move the watched chamber system in accordance with weather conditions or occurrence of red tides, but also to select good sites for watched chamber fishes. 3. Transportation and good supervision with the automated design system can results with the effectiveness which increases the amount of aquatic products.

예연소실식 디젤기관에 있어서 박용부하운전조건에 따른 연소특성을 규명하기 위해 예언소실의 압력데이터를 single-zone, single-chamber의 열역학적 해석에 적용하여 연소해석을 행한 결과 다음과 같은 결론을 얻었다. 1) 부하가 증가함에 따라 최고압력이 상승하고 그 위치가 크랭크각도상 후진되었다. 2) 착화 지연시간은 부하에 관계없이 거의 일정하고, 부하가 증가할수록 가연 혼합기 형성에 소요되는 흡열량은 겉보기로 감소하였다. 3) 예혼합 연소단계의 열발생 양상은 부하에 관계없이 거의 비슷하고, 예혼합 연소시간은 부하가 증가할수록 짧아졌다. 4) 부하가 증가함에 따라 예혼합 연소량은 다소 증가하나 일정 연공비 이상에서는 거의 일정했다. 5) 예혼합 연소분율은 부하가 증가함에 따라 감소했다.(이 논문의 결론부분임)