• 제목/요약/키워드: AdCoCoA

검색결과 254건 처리시간 0.03초

영공(領空)과 우주공간(宇宙空間)의 한계(限界)에 관한 법적(法的) 고찰(考察) ("Legal Study on Boundary between Airspace and Outer Space")

  • 최완식
    • 항공우주정책ㆍ법학회지
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    • 제2권
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    • pp.31-67
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    • 1990
  • One of the first issues which arose in the evolution of air law was the determination of the vertical limits of airspace over private property. In 1959 the UN in its Ad Hoc Committee on the Peaceful Uses of Outer Space, started to give attention to the question of the meaning of the term "outer space". Discussions in the United Nations regarding the delimitation issue were often divided between those in favour of a functional approach ("functionalists"), and those seeking the delineation of a boundary ("spatialists"). The functionalists, backed initially by both major space powers, which viewed any boundary as possibly restricting their access to space(Whether for peaceful or military purposes), won the first rounds, starting with the 1959 Report of the Ad Hoc Committee on the Peaceful Uses of Outer Space which did not consider that the topic called for priority consideration. In 1966, however, the spatialists, were able to place the issue on the agenda of the Outer Sapce Committee pursuant to Resolution 2222 (xxx1). However, the spatialists were not able to present a common position since there existed a variety of propositions for delineation of a boundary. Over the years, the funtionalists have seemed to be losing ground. As the element of location is a decisive factor for the choice of the legal regime to be applied, a purely functional approach to the regulation of activities in the space above the Earth does not offer a solution. It is therefore to be welcomed that there is clear evidence of a growing recognition of the defect inherent to such an approach and that a spatial approach to the problem is gaining support both by a growing number of States as well as by publicists. The search for a solution of the problem of demarcating the two different legal regimes governing the space above the Earth has undoubtedly been facilitated, and a number of countries, among them Argentina, Belgium, France, Italy and Mexico have already advocated the acceptance of the lower boundary of outer space at a height of 100km. The adoption of the principle of sovereignty at that height does not mean that States would not be allowed to take protective measures against space activities above that height which constitute a threat to their security. A parallel can be drawn with the defence of the State's security on the high seas. Measures taken by States in their own protection on the high seas outside the territorial waters-provided that they are proportionate to the danger-are not considered to infringe the principle of international law. The most important issue in this context relates to the problem of a right of passage for space craft through foreign air space in order to reach outer space. In the reports to former ILA Conferences an explanation was given of the reasons why no customary rule of freedom of passage for aircraft through foreign territorial air space could as yet be said to exist. It was suggested, however, that though the essential elements for the creation of a rule of customary international law allowing such passage were still lacking, developments apperaed to point to a steady growth of a feeling of necessity for such a rule. A definite treaty solution of the demarcation problem would require further study which should be carried out by the UN Outer Space Committee in close co-operation with other interested international organizations, including ICAO. If a limit between air space and outer space were established, air space would automatically come under the regime of the Chicago Convention alone. The use of the word "recognize" in Art. I of chicago convention is an acknowledgement of sovereignty over airspace existing as a general principle of law, the binding force of which exists independently of the Convention. Further it is important to note that the Aricle recognizes this sovereignty, as existing for every state, holding it immaterial whether the state is or is not a contracting state. The functional criteria having been created by reference to either the nature of activity or the nature of the space object, the next hurdle would be to provide methods of verification. With regard to the question of international verification the establishment of an International Satelite Monitoring Agency is required. The path towards the successful delimitation of outer space from territorial space is doubtless narrow and stony but the establishment of a precise legal framework, consonant with the basic principles of international law, for the future activities of states in outer space will, it is still believed, remove a source of potentially dangerous conflicts between states, and furthermore afford some safeguard of the rights and interests of non-space powers which otherwise are likely to be eroded by incipient customs based on at present almost complete freedom of action of the space powers.

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UWB 신호채널을 사용한 분산협력 스펙트럼 센싱의 검출확률 향상 (Enhancement of the Detection Probability for Distributed Cooperative Spectrum Sensing using UWB as a Common Channel)

  • ;송주빈
    • 대한전자공학회논문지TC
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    • 제45권7호
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    • pp.22-31
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    • 2008
  • 인지전파 기술은 유효한 스펙트럼을 찾기 위하여 면허사용자(주사용자)의 존재를 검출하는 적절한 센싱 기술이 필요하다. 또한 분산형 ad-hoc 네트워크의 경우 검출된 정보는 부사용자 간에 서로 제공될 수 있어야 한다. 동시에 주사용자의 성능은 부사용자에 의하여 열화 되지 않아야 한다. 특히, 주사용자의 검출은 음영지역에서는 매우 어렵다. 이를 위하여 분산형 협력 스펙트럼 센싱 기술이 제안되었는데 이는 검출 성능을 향상하기 위하여 다수의 부사용자에 의하여 검출된 정보를 협력적으로 조합하는 방법이다. 그러나 이 기술은 주사용자를 검출하는 정확성과 신속성 측면에서 성능 향상이 필요하다. 본 논문에서는 UWB를 사용하여 주사용자를 검출하고 또 이를 사용하여 검출된 정보를 부사용자 노드들에게 제공하는 방법을 제안하였다. UWB는 고속의 데이터 전송이 가능한 장점이 있다. 뿐만 아니라 underlay 방법으로 주사용자와 공존하여 전송이 가능한 장점이 있다. 본 논문에서는 UWB를 사용한 주사용자의 검출 확률 측면에서 개선이 됨을 보였다. 또한 throughput을 해석한 결과 제안된 방법은 기존의 방법과 비교하여 개선되었음을 보였다.

Relative Availability of Iron in Mined Humic Substances for Weanling Pigs

  • Kim, S.W.;Hulbert, L.E.;Rachuonyo, H.A.;McGlone, J.J.
    • Asian-Australasian Journal of Animal Sciences
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    • 제17권9호
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    • pp.1266-1270
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    • 2004
  • Humic substances include several biological active and inactive compounds that are commonly used for improving soil fertility. Use of humic substances in swine diets is a novel concept. Humic substances contain 8,700 mg/kg of iron but its bioavailability is unknown. This study was conducted to test the bioavailability of iron in humic substances for nursery pigs. One hundred twenty five pigs (Newsham, Colorado Springs, CO) were not given supplemental iron while nursing for 21 d. Pigs were weaned on d 21 and allotted to one of five treatments (four control treatments with different levels of supplemented iron; 0, 30, 70 and 88 mg/kg from ${FeSO}_4$ and one treatment with 70 mg/kg iron from humic substances). Pigs were fed diets for 5 wk ad libitum and water was accessible freely. Body weight and feed intake were measured weekly. Blood samples were taken from pigs on d 28 to measure the number of red blood cells and hemoglobin concentration. Pigs fed a diet with the humic substances grew faster (p<0.05) during the first week postweaning, but performance was not different during the entire 5 wk period. Feed intake and gain/feed were the same among treatments. The slope ratio technique was used to estimate relative iron bioavailability. The concentration of blood hemoglobin did not respond to dietary iron levels using this model. However, the number of red blood cells (106/$\mu$l) was modeled by 4.438+0.017${\times}$ 'ron (mg/kg) from ${FeSO}_4$'0.012${\times}$'ron (mg/kg) from the humic substances' Based on the comparison between the slopes (0.012 from humic substances and 0.017 from ${FeSO}_4$), iron in humic substances was 71% as available as the iron in ${FeSO}_4$. The slopes for dietary feed intake of ${FeSO}_4$ and the iron in humic substances did not differ (p>0.05). Humic substances can replace ${FeSO}_4$ as an alternative iron source for pigs at 71% relative bioavailability.

종합편성채널 도입에 따른 지역 지상파방송 대응 전략 (Strategies of Local Terrestrial Broadcasting Companies since the Introduction of Comprehensive Programming Channels)

  • 정종건
    • 한국콘텐츠학회논문지
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    • 제11권7호
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    • pp.192-209
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    • 2011
  • 본 연구는 미디어 시장에서 종합편성채널 도입이 확정된 이후 지역 지상파방송사들의 대응전략을 살펴보았다. 종합편성채널 등장으로 시장경쟁력이 취약한 지역 지상파방송은 제한된 광고시장에서 더욱 생존의 어려움에 내몰린다. 그리고 지역 지상파방송은 규제의 측면에서 종합편성채널에 비해 차별적 적용을 받는다. 의무재송신, 방송권역, 편성규제, 광고규제, 방송발전기금 등에서 역차별을 받고 있다. 이에 지역 지상파 방송사는 어려운 미디어 환경에서 다각적인 대응전략이 필요하다. 무엇보다도 경쟁력 있는 콘텐츠 강화가 절실할 때이다. 그러기에 콘텐츠 유통구조를 다원화할 필요가 있다. 지역방송의 유통구조를 확대하기 위한 방법으로, 전국 네트워크 프로그램에 지역프로그램 편성총량제 도입이 강조된다. 지역방송사가 제작한 프로그램이 주시청시간대에 전국 네트워크를 통해 정규적으로 방송될 수 있도록 하는 의무화정책이 그 예이다. 또한 독자적인 우수한 콘텐츠개발로 2차 유통창구의 다원화가 필요하다. 각 지역방송사와 SO 등 다양한 플랫폼에 공급할 수 있도록 해야 한다. 또한 지역방송사간 권역 간, 권역별 공동제작 프로그램을 활성화시킬 필요가 있다. 중앙사와 지역 방송사 간 전파료를 현실적으로 분배해야 하고 지역방송 자체적으로도 수익모델을 광고 이외에 협찬과 자체사업을 확대하여 경쟁력을 강화시켜 자생력을 키워 나가야 할 것이다. 그리고 광역화를 통해 규모의 경제를 확대해야 할 것이다.

Effects of a Stair-step Growth Pattern on Improvements in Meat Quality and Growth in Hanwoo Steers

  • Li, Z.H.;Lee, H.G.;Xu, C.X.;Hong, Z.S.;Jin, Y.C.;Yin, J.L.;Zhang, Q.K.;Piao, D.C.;Yang, U.M.;Choi, Y.J.
    • Asian-Australasian Journal of Animal Sciences
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    • 제23권11호
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    • pp.1427-1435
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    • 2010
  • The present study was conducted to examine the effect of a stair-stepped feed intake pattern on growth, feed efficiency, and meat quality of Hanwoo steers. Twenty-seven 11-month-old Hanwoo steers were randomly divided into three groups. The control group was fed according to the Korean steer feeding program, and the other two groups were fed according to an alternated feeding schedule of 3-2-4-2 months. During the first three months of the experiment, treatment group 1 (T1) and treatment group 2 (T2) were fed 20% and 30% less than the control group, respectively. For the following two months, the T1 group was fed 20% more than the control group while the T2 group was fed 20% less than the control group. In the third step, T1 and T2 groups were fed 20% and 10% less, respectively, than the control group for four months. In the last two months, T1 and T2 groups were fed 20% more than the control group. After the stair-step feeding trial, steers were fed concentrated feed ad libitum for five months. The altered feed intake pattern did not affect daily body weight gain. However, daily feed intake tended to decrease and growth efficiency tended to increase in the two treatment groups compared to the control group. Altered feed intake also affected blood metabolite levels. The serum glucose and BUN level of the T1 group increased in the first re-fed period compared to the T2 and control groups. The serum cholesterol level of the T2 group decreased in the first restricted-re-fed growth period compared to the T1 and control groups. The serum NEFA levels of the two treatment groups increased from the first restricted period compared to the controls. The serum insulin level of the T2 group increased in the last period compared to the T1 and control groups. Regarding meat yield index, the control group was significantly higher than the T2 group (p<0.05). Regarding meat yield grade, the carcass back fat thickness of the T2 group was significantly higher than the control group (p<0.05). In marbling score, the T1 group was the highest (4.9), followed by the control group (4.1) and the T2 group (4.0). These results indicate that using a stair-stepped growth pattern (T1) can contribute to improvements in growth efficiency and muscle marbling.

충진밀도와 여과속도가 섬유사 여과기의 처리 성능에 미치는 영향 (The Effect on Treatment Performance of Fiber Filter Under Various Packing-Density and Filtration Velocity)

  • 임정훈;김효관;이정준;문태섭;정민기;우혜진;김창원
    • 대한환경공학회지
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    • 제28권2호
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    • pp.216-222
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    • 2006
  • 본 연구에서는 국내에서 개발되어진 섬유사 필터의 충진밀도와 여과속도가 처리 효율에 미치는 영향에 대한 연구결과를 나타내었다. 0.93 mm의 직경을 가진 폴리아마이드 섬유사가 충진된 직경 40 cm, 높이 2 m의 pilot-scale 규모의 반응기에서 수행되었다. 충진밀도가 섬유사 여과기의 처리효율에 미치는 영향을 살펴보기 위해 여과속도를 325 m/hr로 고정하고 충진밀도를 $70kg/m^3$에서 $100kg/m^3$의 범위에서 운전하였으며, 이와 반대로 여과 속도가 섬유사 여과기의 처리효율에 미치는 영향을 연구하기 위해서 충진밀도를 $70kg/m^3$으로 고정시킨 뒤 여과속도를 65 m/hr에서 400 m/hr의 범위로 운전하였다. 충진밀도가 증가할수록 여과 압력은 기하급수적으로 증가하였다. 탁도 및 SS 제거효율은 $80kg/m^3$까지는 30% 이내의 낮은 제거효율을 나타내었으며, $100kg/m^3$에서도 50% 이하의 낮은 제거효율을 나타내었다. 여과속도에 따른 섬유사 여과기의 여과압력은 여과 속도와 비례적으로 증가하였다. 여과속도가 낮을수록 탁도와 SS의 제거효율도 증가하였으며 65 m/hr에서 73%의 제거 효율을 나타내었다. 전체적으로, 섬유사 여과기를 이용한 입자상 물질의 제거 효율을 개선하기 위해서는 충진 밀도 보다 여과속도를 유입수 특성에 따라 적절히 조절하는 것이 효과적인 것으로 나타났다.

VDT 증후군 개선을 위한 렌즈의 임상성능 분석 (linical Performance Analysis of Lens for Improving VDT Syndrome)

  • 유근창;박지훈;전진;진문석;채수철
    • 한국안광학회지
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    • 제14권4호
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    • pp.45-51
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    • 2009
  • 목적: 본 연구는 단초점렌즈와 VDT 증후군 개선을 위해 설계된 기능성렌즈를 착용하고 4시간 동안 VDT 작업 전과 후의 임상성능과 시각적인 문제에 대하여 설문조사를 비교 분석하자 한다. 방법: 20~45세의 남 여 30명을 대상으로 단초점렌즈와 기능성렌즈(ad Plus, HANDOK OPTEC Co.)를 각각 착용시킨 후 4시간 동안 VDT 작업 전과 후의 근거리 및 원거리시력, 등가구면굴절력의 변화, 조절근점, 폭주근점, AC/A ratio, 조절용이성 등을 검사하고, 시각적인 문제에 대한 자각증상을 설문조사하였다. 결과: 단초점렌즈와 비교하여 기능성렌즈를 착용했을 때 근거리시력, 조절근점, 폭주근점, 조절용이성이 유의하게 개선되었다. 4시간 동안 VDT 작업 후의 시각적 문제점에 대한 항목의 평균 점수는 단초점렌즈에서 3.63 ${\pm}$ 0.75이고, 기능성렌즈에서 4.69 ${\pm}$ 0.83으로 기능성렌즈가 유의하게 개선된 것으로 조사되었다. 결론: 기능성렌즈가 단초점렌즈보다 4시간 동안 VDT 작업 후의 조절기능 및 시각적 문제점 개선에 도움이 되는 우수한 렌즈로 생각된다.

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아세클로페낙 연질캡슐(클란자 에스 연질캡슐)의 개발 (Development of Aceclofenac Soft Capsule (Clanza S Soft Capsule))

  • 용철순;이경희;최진석;박병주;정세현;김용일;박상만;배명수;김귀자;길영식;유창훈;강성룡;유봉규;이종달;최한곤
    • Journal of Pharmaceutical Investigation
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    • 제34권1호
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    • pp.49-55
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    • 2004
  • To develop a aceclofenac soft capsule, four preparations with various solubilizers were prepared and their dissolution test was carried out. Among four preparations tested, a preparation with ethanolamine was selected as a formula of aceclofenac soft capsule (Clanza $S^{TM}$), since it showed the fastεst dissolution rate. Bioequivalence of aceclofenac tablet, $Airtal^{TM}$ (Dae-Woong Pharmaceutical Co., Ltd.) and aceclofenac soft capsule, Clanza $S^{TM}$ (Korea United Pharmaceutical Co., Ltd.) was evaluated according to the guideline of KA Fourteen normal male volunteers (age 20 - 25 years old) were divided into two groups and a randomized $2{\times}2$ cross-over study was employed. After oral administration of one tablet or capsule containing 100 mg of aceclofenac, blood was taken at predetermined time intervals and the concentration of aceclofenac in plasma was determined with an HPLC method under UV detector The pharmacokinetic parameters ($C_{max}$ and $AUC_t$) were calculated and ANOVA was utilized for the statistical analysis of parameters using logarithmetically transformed $AUC_t$, $C_{max}$ and $T_{max}$. The results showed that the differences in $AUC_t$, $C_{max}$ and $T_{max}$ between Aral tablet and Clanza soft capsule were 2.89%, 0.18% and 43.0%, respectively. There were no sequence effects between two formulations in these parameters. The 90% confidence intervals using logarithmically transformed data were within the acceptance range of log(0.8) to log(15) (e.g. log(0.81) -log(1.23) ad log(0.89) -log(1.4)) fo $AUC_t$ and $C_{max}$, respectively. Thus, the criteria of the KFDA guidelines for the equivalence was satisfied, indicating that Clanza $S^{TM}$ soft capsule is bioequivalent to$Airtal^{TM}$ tablet.

Aerosol Deposition and Its Potential Use for Bioactive Ceramic Coatings

  • Hahn, Byung-Dong;Park, Dong-Soo;Lee, Jeong-Min;Choi, Jong-Jin;Ryu, Jung-Ho;Yoon, Woon-Ha;Lee, Byoung-Kuk;Choi, Joon-Hwan;Kim, Hyoun-Ee
    • 한국재료학회:학술대회논문집
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    • 한국재료학회 2009년도 추계학술발표대회
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    • pp.41.1-41.1
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    • 2009
  • Aerosol Deposition (AD) is anovel way to fabricate bioactive ceramic coatings in biomedical implants and prostheses applications. In the present work, silicon-substituted hydroxyapatite (HA) coatings on commercially pure titanium were prepared by aerosol deposition using Si-HA powders. The incorporation of silicon in the HA lattice is known to improve the bioactivity of the HA, makingsilicon-substitute HA an attractive alternative to pure HA in biomedical applications. Si-HA powders with the chemical formula $Ca_{10}(PO_4)_6-x(SiO_4)x(OH)_2-x$, having silicon contents up to x=0.5 (1.4 wt%), were synthesized by solid-state reaction of $Ca_2P_2O_7$, $CaCO_3$, and $SiO_2$. The Si-HA powders were characterized by X-ray diffraction (XRD), X-ray fluorescence spectrometry (XRF), and Fourier transform infrared spectroscopy(FT-IR). The corresponding coatings were also analyzed by XRD, scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results revealed that a single-phase Si-HA was obtained without any secondary phases such as $\alpha$- or $\beta$-tricalcium phosphate (TCP) for both the powders and the coatings.The Si-HA coating was about $5\;{\mu}m$ thick, had a densemicrostructure with no cracks or pores. In addition, the proliferation and alkaline phosphatase (ALP) activity of MC3T3-E1 preosteoblast cells grown on the Si-HA coatings were significantly higher than those on the bare Ti and pure HA coating. These results revealed the stimulatory effects induced by siliconsubstitution on the cellular response to the HA coating.

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Effects of Fermented Soybean Meal on Immune Response of Weaned Calves with Experimentally Induced Lipopolysaccharide Challenge

  • Kwon, In-Hyuk;Kim, Myung-Hoo;Yun, Cheol-Heui;Go, Jong-Yeol;Lee, Chan-Ho;Lee, Hyun-June;Phipek, Wisut;Ha, Jong-K.
    • Asian-Australasian Journal of Animal Sciences
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    • 제24권7호
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    • pp.957-964
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    • 2011
  • The present study was conducted to evaluate the effects of fermented soybean meal (FSBM) on the level of cortisol hormone and immune-related serum proteins in weaned calves after experimentally induced lipopolysaccharide (LPS) challenge. Holstein neonatal calves (n = 21; 8 males and 13 females, BW = $42.2{\pm}6.15$ kg) were randomly allocated to one of two dietary treatments: SBM (control calf starter having soybean meal (SBM) as a main protein source) and FSBM (substitute SBM in control diet with FSBM) groups. All calves were fed milk replacer using an automatic milk-feeder according to step-down milking method and weaned at 7 weeks old. Experimental diets were given to calves ad libitum throughout the experimental period. For LPS challenge, all calves except negative control animals given phosphate buffered saline (PBS), were injected subcutaneously with Salmonella typhimurium LPS on day 7 (D7) after weaning (D0). No significant difference in growth performance and milk intake was observed between SBM and FSBM calves. Feeding FSBM diet resulted in significantly (p<0.05) higher LPS-specific IgG at D12 and D19 and LPS-specific IgA at D19 in peripheral blood. Calves fed with FSBM diet also had significantly (p<0.05) higher concentration of serum haptoglobin (Hp) at D8. Overall concentration of cortisol in FSBM group was considerably lower than that of SBM group. Results from current study indicate that FSBM may provide beneficial effects in alleviating weaning stress and enhance immune status of weaned calves.