• The Science & Technology
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• no.5 s.468
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• pp.6-9
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• 2008

외부 행성에서 생명체 전구물질인 유기물 성분이 처음으로 발견됐다. 미항공우주국 연구진은 '네이처'에서 지난해 5월 허블우주망원경의 근적외선 카메라 및 다중목표물 분광계(NICMOS)를 이용해 지구에서 63광년 떨어진 여우자리에 있는 목성 크기 행성 HD 189733b 대기권에서 메탄 화합물을 발견했다고 밝혔다. 탄소와 수소로 이루어진 메탄은 태양계 행성 대부분에서 발견되지만 외부 행성에서 발견되기는 이번이 처음이다. 연구진은 이 행성에서 물도 발견됐지만 중심별과 가까워 온도가 $900^{\circ}C$로 생명체가 살기에는 너무 뜨겁다며 조건이 이보다 좋은 행성이라면 생명물질을 추적해 볼 만하다고 밝혔다. 지구 대기권에서 메탄은 화학반응을 통해 빠른 속도로 분해되지만 작은 행성에서라면 지구에서처럼 분해된 메탄에서 나온 수소가 빠른 속도로 우주로 빠져 나올 것으로 예상된다. 과학자들은 지구 크기의 행성에서 많은 양의 메탄이 발견된다는 것은 생물학적 과정의 결과일 가능성이 있는 것으로 보고 있다. 메탄은 비생물학적 과정에서도 형성될 수 있지만 이런 경우 다량의 입자를 만들지는 않는다. 과학자들은 2013년 발사될 제임스 웹 망원경을통해다른외부행성에서물과메탄을찾아나설계획이다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.9
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• pp.746-756
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• 2017

An algorithm is developed to generate measurement data of deep space network for Korea Pathfinder Lunar Orbiter (KPLO) mission. The algorithm can provide corrected measurement data for the Orbit Determination (OD) module in deep space. This study describes how to generate the computed data such as range, Doppler, azimuth angle and elevation angle. The geometric data were obtained by General Mission Analysis Tool (GMAT) simulation and the corrected data were calculated with measurement models. Therefore, the result of total delay includes effects of tropospheric delay, ionospheric delay, charged particle delay, antenna offset delay, and tropospheric refraction delay. The computed measurement data were validated by comparison with the results from Orbit Determination ToolBoX (ODTBX).

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.413-414
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• 2003

최근의 대기오염과 기후변화는 특정 지역에만 국한되지 않고 전지구 규모로 발생하고 있다. 따라서 인공위성에 탑재된 원격 센서들을 이용한 대기환경 모니터링이 주목을 받고 있다. 일산화탄소 (CO)는 OH 농도와 직접적인 관련이 있는 대류권 화학에서 매우 중요한 미량기체이며, 대기 중 lifetime이 약 2개월이므로 산불이나 대규모 공업단지에서 생성된 CO를 포함한 오염물질들의 추적자로 사용될 수 있다. 이러한 취지에서 MOPITT (Measurement of Pollution in The Troposphere) 기기가 개발되어, 1999년에 지구관측위성인 Terra에 탑재되어 CO 및 CH$_4$ 모니터링을 수행하고 있다. (중략)

• 한국신재생에너지학회:학술대회논문집
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• 2005.06a
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• pp.132-135
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• 2005

A modular photovoltaic PCS with high-frequency isolation is proposed. The proposed system consists of a SEPIC converter and a full-bridge inverter. Using the power slope versus voltage of the PV array, the MPPT controller is proposed that produces a smooth transition to the maximum power point. The disturbance of the line voltage is detected using a fast sensing technique. Experimental results obtained on a 500W prototype show high performance such as almost unity power factor, $90\%$ power efficiency, $3.6\%$ THD.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.729-730
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• 2008

This paper suggests the indoor localization footwear system based on RFID and smart floor with effective RFID tag arrangement using simulation. The result of the simulation demonstrates that smart floor has optimal RFID tag interval according to moving characteristics.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.597-600
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• 1999

In this paper, we propose a fast object-tracking algorithm in a moving picture. The proposed object-tracking algorithm is based on a projection scheme. More specifically, to alleviate the computational complexities of the previous motion estimation methods, we propose to use the projected row and column 1-D image data to extract the motion information. Experimental results show that the proposed method can detect the motion of an object fairly well with reduced computational time.

• Proceedings of the CALSEC Conference
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• 2001.08a
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• pp.449-455
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• 2001

SCM(물류) 관리자의 역할 경영자와 주주를 위한 SCM(물류) BPR Master Plan을 통한 Innovation SCM 총비용 추적 및 관리 Visibility 향상을 통한 고객 만족지수 향상 및 수요 창출 지속적인 SCM 비용 감소를 위한 방안 고정 자산 투자 감소 재고 자산 비용 물류 Outsourcing 증대 SCM비용감소 vs 고객 만족 Process(S/W) vs H/W 통합 SCM 정보 시스템 구축(Big Picture) Best of Breed Solution Roadmap Analyst Critical Decision Supporter(중략)

• Proceedings of the KWS Conference
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• 1994.10a
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• pp.134-137
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• 1994

In this study, The mean weld current is used to correct depth direction, and weight-value, specially devised to check right-left deviation by placing more weight on the left- and right-most part of weld current during weaving, to correct weaving direction. The methodology of “design of experiments” was introduced to find out dorminant weld parameters affecting these for values.

• Clinical and Experimental Pediatrics
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• v.48 no.2
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• pp.165-173
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• 2005

Purpose : We performed the study to evaluate the value of the follow-up echocardiogram performed 6 months to 1 year after the onset of Kawasaki disease(KD), as recommended by American Heart Association(AHA) guidelines, when echocardiograms in the convalescent period were normal. Methods : Patients were selected from 147 cases diagnosed with KD at Pusan Paik hospital from January 2000 to October 2003. A total of 45 KD patients belonged to AHA risk level I and II were performed follow-up echocardiography. The patient's medical records and echocardiogram were reviewed. Additionally, we sought the opinion of pediatric cardiologists on the subject by means of a multiple-choice survey. Results : 37 children were belonged to AHA risk level I and the remaining 8 patients were belonged to risk level II. Of these 45 children, none were noted to have abnormalities on later follow-up echocardiogram. In the results of questionnaire, 37 percent of the participants advocate no follow-up after convalescent period for risk level I, and 33.3 percent favor periodic follow-up with echocardiography for risk level II up to one year. But there were no consensus about the diagnostic criteria of coronary abnormalities and how to follow-up these patients. Conclusion : All children with KD should have an echocardiogram at present and a follow-up study 6 to 8 weeks after the onset of fever. However, additional echocardiographies are not justified if the 6- to 8-week follow-up echocardiogram is normal. We would recommend that the more reasonable diagnostic criteria for coronary abnormalities and the Korean guidelines for long-term cardiovascular management and follow-up of KD need to be established.

• The Journal of Society for e-Business Studies
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• v.14 no.4
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• pp.299-313
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• 2009

As domestic logistics environment has changed into global logistics, various logistics parties are participating in processing logistics business. Goods is packed into container and delivered to consignee in steps. The goods may be damaged or lost since it has not directly delivered to consignee by single entity during the delivery process. Therefore, all parties want to know the flow of export/import cargos. However, it is very difficult to follow cargo flow consistently delivered from consignor to consignee. Because cargo flow does not be matched up information flow and information systems are based on neither standard business processes nor standard data, which makes it very difficult to associate logistics data among various logistic parties. This paper performs business process modeling for cargo tracking with international standard modeling methodology released by UN/CEFACT. And then, the standard data is defined for cargo tracking business process of unified and integrated business collaboration. The resulting business process model and data model will support international interoperability.