• 주류공업
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• v.18 no.1
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• pp.38-49
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• 1998

• Lingua Humanitatis
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• v.1 no.1
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• pp.97-112
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• 2001

• 발명특허
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• v.1 no.8 s.8
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• pp.11-12
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• 1976

• Water for future
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• v.29 no.1
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• pp.50-52
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• 1996

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.811-814
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• 2009

The HF band maritime communication is have developing to digital methode that techniques should be readied the automatic link establishment of 1:N by coast station to many ship station. Because can use way by polling simply that communication environment calls particular station wicked fellow HF communication states which is much redundancy times for coast station to set link. In amateur radio particular station selective calling do to be using ALE(Automatic Link Establishment) controller by 1:1 automatic link setting way, but expect 1:N link setting by these way in maritime communication very difficult. That is difficult to avoid collision by traffic overload to induce calling of ship stations. Because HF communication considers channel special quality traffic state radio link should be established, and should be applied automatically secures stability of channel as accommodative at traffic overload. In this paper is studied the new radio protocol by 3 step sequency driving of free access, group free access and polling access using multi-tone in single channel.

• Journal of Navigation and Port Research
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• v.39 no.1
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• pp.77-82
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• 2015

Slamming means that the hull hits the waves and receives impact pressure. This slamming effect may cause harm to people and when you put the hull at risk. so it is very harmful for cargo safety. Therefor slamming impact pressure should be fully considered in ship designing. In this study the model of wedged type structure are produced aimed to simulate a free fall that the experiments were carried out on different weight and free fall height. The flow field has been obtained by 2-frame grey level cross correlation PIV(Particle Image Velocimetry) method and experiment was divided into water entry and water exit. The impact pressure of free fall structure by a pressure acquisition system apply to dewetron system. The angles between a model and the water surface are adapted $15^{\circ}$ respectively. The weight change of models was given as 1.5, 1.8 and 2.0kg. To study slamming phenomenon for free fall height the experiments were carried out by the free fall height of 100, 200 and 300mm. The experimental value of the impact pressure according to the changes in weight was increase impact pressure in proportion to the increase in weight and higher free falling height has also influenced the increase in impact pressures.

• Journal of the Korean Society of Food Science and Nutrition
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• v.44 no.7
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• pp.961-969
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• 2015

To investigate the effect of n-3 fatty acid from Bokbunja (Rubus coreanus Miq.) seed oil (BSO), we examined improvement of plasma triglycerides and cholesterol in vivo. Five-week-old ICR mice were divided into five groups of six mice each; Control, high fat diet (HFD) control (negative control), salmon oil control (positive control, HFD+commercial n-3 fatty acid), and BSO experimental groups (HFD+1 g/60 kg BW/d, HFD+2 g/60 kg BW/d). After 4 weeks of BSO treatment, we measured serum triglyceride and cholesterol levels. The levels of low-density lipoprotein/very-low-density lipoprotein-cholesterol, high-density lipoprotein-cholesterol, and total cholesterol were significantly (P<0.05) reduced in the group fed BSO at 2 g/60 kg BW/d compared to the negative control. Levels of triglycerides, which are similar to cholesterol, were also significantly (P<0.05) reduced in the same group. To investigate further, we tested blood coagulation parameters. Prothrombin time (PT) and activated partial thromboplastin time (aPTT) were not significantly different among the five groups according to BSO. However, the 2 g/60 kg BW/d BSO group treated with PT and aPTT showed a tendency to live longer than the negative control. Taken together, BSO might improve blood homeostasis mediated via hypo-lipidemic and anti-coagulation activities.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2004.11a
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• pp.107-108
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• 2004

산란계 육성기 제한시기 및 제한강도가 육성기 발육형태 및 산란생산성 반응을 구명하고자 1일령 갈색 산란 실용계 Isa-brown 1,000수를 공시하여 70주간 사양시험을 실시하였다. 사료급여 방법은 자유채식구와 제한급이구 9처리를 두었는데, 제한시기는 4, 6 및 8주령으로 하였고 제한강도는 각 시기별 70 %, 85 % 및 12주령 기준으로 70 %에서 85 %로 하는 처리를 두었다. 육성기 사료섭취량은 제한급이시기가 빠를수록 제한강도가 강할수록 자유채식구에 비하여 유의적으로 낮게 나타났다(P<0.05). 산란생산성은 4주령, 85 %구와 6주령 70 % 및 6주령 70 $\longrightarrow$ 85 % 전환구가 가장 우수한 것으로 나타났다. 계란 난각의 품질은 제한급이구가 산란후기에 자유채식구 대비 양호한 것으로 나타났다. 이상의 결과에서 육성기 제한급이는 육성기 사료섭취량을 절감할 수 있으며 생산성과 난각질 향상에 기여할 것으로 판단된다.

• Proceedings of the Optical Society of Korea Conference
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• 2000.02a
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• pp.48-49
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• 2000

한국원자력연구소에서는 가속기의 직경이 70 cm이고, 마그네트론 고주파 발생장치를 사용하는 소형 마이크로트론을 이용한 원적외선 자유전자레이저를 개발하였다$^{(1)}$ . 발진 파장은 100 - 200 $mu extrm{m}$ 영역이며, 첨두 출력은 약 1 - 10 kW이다. 본 연구에서는 개발된 원적외선 자유전자레이저의 시스템 개요와 출력 특성에 관하여 살펴보았다. 최근, 반도체와 물성의 분광학연구, 생명공학연구, 광화학 반응연구, 환경감시 기술개발, 인체영상, 군사용 감시기술 개발 등의 분야에서 새로운 연구와 첨단기술개발에 필요한 원적외선 광원의 요구가 점차 높아지고 있다. 이러한 요구에 부응하기 위하여 원적외선 영역의 다양한 광원 개발이 이루어지고 있으며, 특히, 테라헤르쯔 반도체 소자를 개발하기 위한 노력이 국내외에서 활발히 이루어지고 있다. 그러나, 아직까지는 이러한 광원의 출력이 mW 이하이고, 분광특성이 나빠서 실제응용에 많은 제한이 있다. (중략)

• Journal of Advanced Navigation Technology
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• v.16 no.1
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• pp.122-130
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• 2012

Airborne separation assurance is a key requirement for Free Flight. This paper is to propose autonomous flight algorithm, such as extended authority of delegation, efficiency of airspace issue to deal with the empirical solution for free flight, and to measure flight efficiency and conflict detection and resolution (CD&R) by utilizing flight performance data under the two circumstances of scenario with the modeling of proposed algorithm and potential field algorithm. The results show that the autonomous flight algorithm is superior to the potential field algorithm under the circumstances of free flight airspace in terms of algorithm performance, CD&R, and flight efficiency.