• Proceedings of the Korea Society of Design Studies Conference
• /
• 1998.04a
• /
• pp.38-39
• /
• 1998

• Proceedings of the Korean Society of Life Science Conference
• /
• 2006.09a
• /
• pp.21-21
• /
• 2006

• Proceedings of the Korean Fiber Society Conference
• /
• 1990.06b
• /
• pp.7-7
• /
• 1990

• Journal of Information Management
• /
• v.6 no.1
• /
• pp.19-24
• /
• 1973

• Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
• /
• v.9
• /
• pp.261-280
• /
• 2004

DaF-Lehrende in Korea erfahren oft, dass koreanische DaF-Lernende $\"{u}ber$ ein gutes Regelwissen im Deutschen $verf\"{u}gen$, aber oft nur weinh verstehen und sprechen $k\"{o}nnen$. Das bedeutet, dass das Auswendiglernen von grammatischen Regeln und ihr tatsachliches Anwenden zweierlei sind. Wenn Grammatikkompetenz mit der fremdsprachlichen Kompetenz nicht gieichzusetzen ist, stellt sich die Frage, wie den Lemern durch die Grammatik ein $selbst\"{a}ndiges$ Erlernen von erammatischen Eigenschaften bis hin zur freien Anwendung des Gelernten in den Kommunikationssituationen $erm\"{o}glicht$ werden kann. $F\"{u}r$ die Antwort auf die Frage werden im vorliegenden Artikel Lornergrarnmatik und ihre didaktischen Prinzipien vorgestelit. In der Lornergrarnmatik handelt es sich um die Beschreibung des Regelsystems einer Sprache $f\"{u}r$ Unterrichtszwecke. Das ist mehr als eine Sprachbeschreibung. Sie $ber\"{u}cksichtigt$ dabei den Sanzen Lern- und Lehrverlauf von Regeln und auch die didaktiche Frage, wie man ein Reselsystem aufteilen, darstellen und im Unterricht $pr\"{a}sentieren$ kann

• Proceedings of the KIPE Conference
• /
• 2001.10a
• /
• pp.785-789
• /
• 2001

Piezoelectric actuators are characterized by non-linear dynamics and high frequency oscillations of the piezocrystal. Both properties have to be taken into consideration when optimizing real time systems. Taking benefit of the almost linear behaviour between charge and strain, current source fed piezoelectric actuators are given preference for high dynamic applications. Here special emphasis is put on current sources for multi-actuator systems and the controller design for optimal system integration of the actuator. It is shown that sliding mode operation of the converter system offers good possibilities to guaranty high accuracy and dynamics of the actuators system. The presented multi-actuator system is used for positioning and vibration damping in flexible mechanical systems.

• 유체기계공업학회:학술대회논문집
• /
• 2002.12a
• /
• pp.177-182
• /
• 2002

In the paper, the development of high-speed industrial turbo blowers with foil air bearings is presented as a first successful commercialization in the world. Their target market is various from wastewater treatment to cement factory processes which require compressed air ranging between 0.6 and 0.8 bar gauge. Employing the state-of·the-art technology of the high-speed BLDC motors, the bump-type foil air bearings and the high- efficient turbo impellers/diffusers, so much compact, efficient and silent blower machines of a single stage are now available in the market, aiming to replace the existing inefficient, bulky and noisy ones, such as roots blowers. The first production lines are established fur 25,75 and 150 hp class blowers. Rotational speeds from about 20,000 to 80,000 rpm are realized directly from the high-speed BLDC motors without any gear boxes, and no lubrication oil is required. A brief introduction of design, manufacture and test results is presented fur mechanical, electrical and aerodynamic performance.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2002.04a
• /
• pp.173-179
• /
• 2002

This paper presents a new approach to the design of adaptive control system using DSPs(TMS320C50) fur robotic manipulators to achieve trajectory tracking angles. Digital signal processors are used in implementing real time adaptive control algorithms to provide motion for robotic manipulators. In the proposed scheme, adaptation laws are derived from the improved second stability analysis based on the indirect adaptive control theory. The proposed control scheme is simple in structure, fast in computation, an suitable fur implementation of real-time control. Moreover, this scheme does not require an accurate dynamic modeling, nor values of manipulator parameters and payload. Performance of the adaptive controller is illustrated by experimental results for a SCARA robot.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.27 no.1
• /
• pp.117-124
• /
• 2003

Thermal design fur satellite propulsion system has been performed. Overall design requirements and the constitution for propulsion system is described. To meet the thermal design requirements, both a primary and a redundant heater circuit, each with two thermostats placed in series, will protect each hydrazine-wetted components, even if one heater circuit fails to operate. Heater power is turned off if any one of these thermostats is opened at its higher setpoint. Thus, even if one thermostat is failed closed, the second thermostat will turn off the heater. All such components shall be insulated with MLI. Propulsion heater sizing based on the constant worst cold case condition is conducted through thermal analysis. All heaters selected fur propulsion components operate to prevent propellant freezing satisfying the thermal requirements for the propulsion subsystem over the worst case average voltage, i.e. 25 volts.

• Journal of Embryo Transfer
• /
• v.16 no.3
• /
• pp.233-237
• /
• 2001

To develop an effective vitrification method, we examined the use of a conventional straw as vessel fur vitrification of mouse oocytes, and to compare the post-thaw survival and chromosome configuration of these oocytes with those vitrified in grids. Intact cumulus-enclosed oocytes were vitrified with DPBS with 5.5 M ethylene glycol and 1.0 M sucrose, and loaded into straws and onto eletron microscopic copper grid fur storing in liquid nitrogen. Intact vitrified and thawed oocytes were karyotying for chromosome. The rates of post-thawed survival were 88.5% in vitrified oocytes with straws, and 83% in vitrified ooctyes with grids. Vitrified and thawed oocytes with straws and grids were increased chromosomal abnormality (31.4% and 30.9%) compared with fresh oocytes (17.8%). The conventional straws can be used as vessel for vitrification to prevent of inflection in liquid nitrogen.