• Korean Journal of Pharmacognosy
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• v.6 no.3
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• pp.151-159
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• 1975

Botanical origins of three drugs, 'Won-bangpoong,' 'Shik-bangpoong' and 'Jaezoo-bangpoong' are not certain on the present market in Korea. These three were compared with two kinds of Chinese 'bangpoong' by histology and screening tests of roots. The original plant of 'Won-bangpoong' which is domestically used is Glehnia littoralis SCHMIDT et MIQUEL 'Shik-bangpoong' Peucedanum japonicum THUNBERG and 'Jaezoo-bangpoong' Seseli coreana KITAKAWA. Chinese "bangpoong" appears to be Siler divaricatum $B_{ENTHAM}$ et Hook, being different from others. "Shik-bangpoong" is easily distinguished from others two in external morphology. Thee kinds of available "Bangpoong" are different from one another in the internal structures and in the internal structures and in the screening tests by TLC.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.05a
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• pp.153-158
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• 1997

This paper describes a formal safety analysis technique which is demonstrated by performing empirical formal safety analysis with the case study of beamline hutch door Interlock system that is developed by using PLC(Programmable Logic Controller) systems at the Pohang Accelerator Laboratory. In order to perform formal safety analysis, we have built the Z formal specifications representation from user requirement written in ambiguous natural language and target PLC ladder logic, respectively. We have also studied the effective method to express typical PLC timer component by using specific Z formal notation which is supported by temporal history. We present a formal proof technique specifying and verifying that the hazardous states are not introduced into ladder logic in the PLC-based safety critical system.

• Korean Journal of Pharmacognosy
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• v.7 no.4
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• pp.233-235
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• 1976

Substances $I{\sim}VII$ are isolated from the root of Glehnia littoralis which has been often used as a subsitute of Bang-Poong in Korea. White needle crystalline substance of $C_{29}H_{50}O$, m.p. $137{\sim}139^{\circ}C$ was confirmed as ${\beta}-sitosterol$ through elemental analysis, derivative synthesis, IR and physicochemical tests. Moreover, it was concluded that white needle crystal of $C_{12}H_{8}O_{4}$, m.p. $188{\sim}189^{\circ}$ was confirmed as bergapten, through a contrast test with standard substance and by UV and IR-spectra. It was found that substance III and VII coincided with the Rf values of imperatorin and umbelliferone and to its colors under the UV-ray, and its similarity to UV-spectrum can be recognized, but their melting points are remarkedly different respectively.

• Korean Institute of Interior Design Journal
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• no.13
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• pp.197-202
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• 1997

In this study, we surveyed historical housing settlements of Hwangjon in Bonghwa-a clan village in Youngnam district which was formed in the Chosun Dynasty. We observe the relationships among the spatial layout of clan villages, the water flows and the family hierarchies as follows; (1) when a clan village was initially formed, the water flow, which is the phylosophical foundation of Poong Soo, was the most important factor for determining the original location; (2) as villages prosper, the water flow and the family hierarchy still played an important role in determining the following geological locations; (3) in modern age, however, the water flow and the family hierarchy lost the role in detrmining the geological locations; (4) consequently, in present days, each household becomes isolated from the village. Reflecting on these observations, for village to be maintained, we conclude that we need novel practical and cohesive village forming drives that can replace the water flows and the family hierarchy in the past.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.5-7
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• 2006

Current transformers(CTs) whose rating is selected per a full load current of a feeder in high voltage system can be easily saturated due to high fault current that may be several hundred times of the full load current of the feeder. However, the protective relay shall operate properly at the fault without mis-operation under the CT saturation. So, in selecting the CT rating, it is necessary to consider the behaviour of CT and a performance of protection scheme in condition where CT can be saturated. In this paper, a performance of CT and a degree of saturation are studied and verified whether its ratings are proper for the operation of the protective relay.

• Speech Sciences
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• v.8 no.2
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• pp.119-132
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• 2001

The purpose of this study is to investigate the intonation of Korean speakers in English sentence adverbials. The intonation of English sentence adverbials is realized by its syntactic and semantic meaning. Many Korean speakers realize falling or stylized high-rising intonation instead of fall-rising in attitudinal adverbials. In addition, Korean students don't realize deaccenting in likelihood adverbials. These results suggest that the intonation patterns in current English textbooks are not sufficient for English intonation education at school.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.11a
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• pp.174-177
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• 2007

In this work, we researched static and dynamic characteristics concern to hydraulic regulator control process and parameter setting, which is used on liquid rocket engine regulation. The hydraulic regulator of 8K14 "SCUD" 9D21 engine is analyzed and on the basis of the developed mathematical modeling the analysis of response time and certification on automatic control accuracy is carried out. In this process, we find out specific design configuration of needle valve flow section that effects on pressure regulation performance.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.11a
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• pp.325-328
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• 2007

In this study, intended to high flight condition test, air flow test and environmental condition test of Small-sized Gas Turbine (including auxiliary power utility - APU) improve preexisting large size test stand C-9N(SCIAM) in Russia. In the process of developing C-9N test stand, this study includes conceptual design approach. This test stand consists of environmental condition, thermostat, cooling/drying, thrust measuring system and SAR (system of automatic regulation).

• Journal of the Korean Society for Precision Engineering
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• v.28 no.8
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• pp.886-893
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• 2011

To increase the reliability and positional accuracy of a machine tool, a novel capacitive displacement sensor having a cylindrical shape is presented to measure the axial displacement of a machine tool spindle. Characteristics of the sensor were analyzed by numerical simulation. The sensor was built into a specific machine tool spindle and its performance was experimentally investigated. The accuracy of a thermal error compensation system of a machine tool can be enhanced greatly using proposed sensor.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.330-330
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• 2000

In this paper, as an entertainment robot the implementation of boxing robot system is presented for mechatronics education. In order for students to learn robot as a mechatronics system, boxing robot is a good model. The boxing robot consists of three parts: two link arms for punching, controller for actuating wheeled mobile robot, infrared rays sensors for the detection of he other robot and ring. The strategic algorithm for playing boxing is presented as wel as simple game rules.