• 전기학회논문지
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• 제57권3호
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• pp.403-408
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• 2008

The gyroscope is the sensor for detecting the rotation in inertial reference frame and constitute the navigation system together an accelerometer. As the inertial reference equipment for attitude determination and control in the satellite, the mechanical gyroscope has been used but it bring the disturbance for mass unbalance so the disturbance give a bad influence to the observation satellite mission because the mechanical gyroscope has the rotation parts. During the launch. The mechanical gyroscope is weak in vibration, shock and has the defect of narrow operating temperature range so it need the special design in integration. Recently the low orbit observation satellite for seeking the high pointing accuracy of image camera payload accept the FOG(Fiber Optic Gyro) or RLG(Ring Laser Gyro) for the attitude determination and control. The Ring Laser Gyro makes use of the Sanac effect within a resonant ring cavity of a He-Ne laser and has more accuracy than the other gyros. It need the 1000V DC to create the He-Ne plasma in discharge tube. In this paper, the design process of the High Voltage Power Supply for RLG(Ring Laser Gyroscope) is described. The specification for High Voltage Power Supply (HVPS) is proposed. Also, The analysis of flyback converter topology is explained. The Design for the HVPS is composed of the inverter circuit, feedback control circuit, high frequency switching transformer design and voltage doubler circuit.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.302-309
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• 2007

Web is becoming a necessary element of information acquisition methods for us who live in an information and knowledge-oriented society, as it is today. It is deriving a revolutionary change on various parts of our society, such as education, culture, etc. Also due to epoch-making development and diversification of web-related technologies and content types, the knowledge, technique and complexity of web users also accompanied it. In this research web-related education of schools for the visually handicapped and current situation of web access of such students are seized, their problems related to web access are analyzed, and efficient alternatives for web implementation to solve those problems were suggested. On the other hand, since this research is a survey targeting information and computer related teachers of 12 schools for the visually handicapped within Korea, it has the restriction that it does not include the analysis of current state of charity facilities which are not regular education institutions. Moreover, the content of the survey is composed by considering totally blind students, thus more detailed survey should also be conducted for weak-sighted students as well.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2003년도 학술대회지
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• pp.626-629
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• 2003

본 연구는 외기에 면한 초고층 아파트 최상층부의 발코니 천장내부에 있는 H-Beam(내화피복+단열재로 구성)과 Parepet 부위 내부결로 발생가능성에 대한 예측을 해 봄으로써 해당공간 거주자의 쾌적한 환경 만족 및 불안을 해소 하는데 그 목적이 있다. 외주부를 성하고 있는 Curtain wall, Stone panel 또는 슬래브 바닥하부 등의 열적 취약공간에 대해 2차원 정상상태(온도평형) 열전도해석 Program을 이용, 온도예측과 온도분포해적을 통해 해당부위의 습기압분포에 따른 내부결로 예측을 실시하였다.

• 한국철도학회논문집
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• 제8권4호
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• pp.367-371
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• 2005

Pile foundations are utilized when soil is so weak that shallow foundations are not suitable or point load is concentrated in small area. Such soil can be formed by the land reclamation works which have extensively been executed along the coastal line of southern and western parts of the Korean Peninsula. The working load at pile is sometimes subjected to not only compression load but also lateral load sad uplift forces. But in most of the practice design, uplift capacity of pile foundation is not considered and estimation of uplift capacity is presumed on the compression skin friction. This study was carried out to determine that the effect of embedment ratio and loading rate on uplift adhesion factor of concrete pile driven in clay. Based on the test results, the critical embedment ratio is about 9. Adhesion factor is constant under the critical embedment ratio, and decreasing over the critical embedment ratio. Also, adhesion factor is increased with the loading rate is increased.

• 산업공학
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• 제13권3호
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• pp.296-305
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• 2000

In supply chains, coordination between a manufacturer and suppliers is regarded as the most important issue when partnership of organizations is considered. Since the suppliers are external to the manufacturer and poor coordination between them results in excessive delays and ultimately leads to poor customer service, manufacturers need a new methodology to select suppliers and to manage and enhance the partnership between manufacturer and suppliers. We suggest a methodology that extends knowledge obtained from the supplier selection process to the supplier management process. We reserved a word, the supplier selection and management system (SSMS) for this methodology. In this paper, we explain how the SSMS is applied to a real supply chain. The methodology identifies the managerial criteria using information derived from supplier selection process and makes use of them in the supplier management process. These managerial criteria include key criteria that are major criteria required by the manufacturer for the best quality of parts from suppliers according to the character of each part, and weak criteria that show the shortcomings of selected suppliers as compared with alternative suppliers with regard to each criterion. The effectiveness of supplier management with managerial criteria was verified by a t-test and a correlation analysis with data collected and hypothesized from a Korean air-conditioner manufacturer.

• Natural Product Sciences
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• 제15권4호
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• pp.234-240
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• 2009

Phytochemical investigation of the MeOH extract of the aerial parts of Bistorta manshuriensis resulted in the isolation of two cerebrosides, two lactams, six phenolic compounds and seven flavonoids. Their chemical structures were characterized by spectroscopic methods to be pinelloside (1), soyacerebroside I (2), pterolactam (3), 5-hydroxypyrrolidine-2-one (4), vanillic acid (5), caffeic acid methyl ester (6), protocatechuic acid (7), caffeic acid (8), 3,5-di-O-caffeoyl quinic acid methyl ester (9), chlorogenic acid methyl ester (10), avicularin (11), afzelin (12), quercetin (13), isoorientin (14), quercetin 3-O-${\beta}$-D-glucoside (15), quercitrin (16), and luteolin (17). The isolated compounds (1 - 4, 7, 12, 14) were isolated for the first time from this plant source and the compounds 1 - 4, 9 and 10 were first reported from the genus Bistorta. Compound 17 exhibited moderate cytotoxicity and compound 6 exhibited weak cytotoxicity against four human cancer cell lines in vitro using an SRB bioassay.

• Geomechanics and Engineering
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• 제12권4호
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• pp.561-577
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• 2017

Vast parts of the east of Tabriz city have been covered by Baghmisheh formation marls. These marls can be classified into three types based on their color as identified in yellow, green, and gray marls. Many high-rise buildings and other projects were founded and now is constructing on these marls. Baghmisheh formation marls are classified as stiff soil to very weak rock, therefore they undergo considerable consolidation settlement under foundation loads. This study presents the physical properties and consolidation behavior of these marls. According to the XRD tests, major clay minerals of marls are Illite, Kaolinite, Montmorillonite and Chloride. Uniaxial compressive strength are 100-250, 300-480 and 500-560 kPa for yellow, green and gray marls, respectively. Consolidation and creep behavior of Baghmisheh marls investigated by using of one dimensional consolidation apparatus under stress level up to 5 MPa. The results indicate that yellow marls have high compressibility, settlement and deformation modules. Green marls have an intermediate compressibility and settlement and while gray marls have low compressibility and settlement and from the foundation point of view have high stability. According to the creep test results, all types of marls have not been entered to progressive creep phase up to pressure 5 MPa.

• 유통과학연구
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• 제11권3호
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• pp.49-62
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• 2013

Purpose - The purpose of this paper is has been to identify the information disclosed by Internet website companies listed in Tehran Stock Exchange. Research design, data, methodology - The list was prepared includes 84 attributes for financial information in two parts and 36 non-financial information attributes and with 48 attributes of listed companies in Tehran Stock Exchange. Results - The results show that Internet reporting in Iran has improved compared to previous research. However, the level of financial disclosure and accounting firms with the most important research in this area is weak and these companies are more willing to disclose non-financial information to disclose their financial information. In Iran has been little research on Internet financial reporting. Conclusions - Although this study has been to the best possible information is available on the website of each company covered and fully evaluated but May have some unwanted data hidden from view has been fulfilled and is missing. The attribute relating to support of other languages, in this study, only the presence or absence of links (other languages) and information disclosed is limited to languages have not been studied other than Persian.

• 시스템엔지니어링학술지
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• 제6권1호
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• pp.61-68
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• 2010

Generally EPC management system was simply management concept through the normal S/W. Our LNG Plant R&D Center wanted to the excellent management system from the S/W. So We developed the R&D management S/W and EPC management S/W Built in the Microsoft Project Server. Our system made to the customer Requirements. It was just User Interface protocol. But User Interface has more Weak position, because it makes from the MS Project Servers. Ms Projector server make easy to treat the project on the WBS. EPC parts mixed WBS and normally Ms SQL Database. It has very complicated Structures. Now We planed to make the general Database and Ms Project Server, It' means to the S/W Developer and Schedule Manager ability. We will successfully integrate R&D management system and EPC system and other softwares.

• 정보처리학회논문지D
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• 제11D권7호
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• pp.1435-1442
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• 2004

최근 소프트웨어 개발 방법론 중 소프트웨어 부품화하고 이를 조립${\cdot}$합성하여 새로운 어플리케이션을 개발하는 방식의 CBD 방법론이 많이 연구되고 있다. 그러나 CBD 방법론은 시스템의 기능적인 특성을 중심으로 분할하는 경향이 많아 컴포넌트에 대한 추론, 문서화, 코드의 이해를 어렵게 하는 단점이 있다. 따라서 본 논문에서는 영역지향 프로그래밍 기술을 CBD 방법론과 UML 다이어그램에 적용하여 CBD 방법론의 단점을 보완함으로써 컴포넌트의 재사용을 용이하게 하고 시스템 개발 시간 단축과 개발비용의 감소를 유도하였다.