• Proceedings of the KSR Conference
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• 2009.05a
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• pp.892-899
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• 2009

This paper describes the design and fabrication of a soil resistivity measurement system using 9 auxiliary electrodes; 6 potential-, a reference-, a current-, and a ground- electrode. The measurement system is composed of a current source (300 [Vrms], 5 [A], Sine-wave, 45 $\sim$ 500 [Hz]), a data acquisition (400 [kS/s], 16 bit, 16 Ch.), and an operating program based on a graphical software of National Instrument Co. The proposed system is convenient for choosing the position of electrodes because the soil resistivity is calculated having no concern with the length and the spacing between electrodes.

• Transactions of Materials Processing
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• v.11 no.7
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• pp.561-568
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• 2002

Micro tensile test is the most direct and convenient method to measure material properties such as Young's modulus and fracture strength. It, however, needs more accurate measurement system, mote stable and repetitive alignment and more sensitive gripping than conventional tensile test. Many researchers have put their effort on overcoming these difficulties for tile development of micro tensile tester, fabricating micro specimens of functional materials and measuring their properties. This paper will review the related vigorous researches over the world in the recent decade and explain how to apply them to a design of the fester which is under our own development.

• Journal of Ocean Engineering and Technology
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• v.18 no.1
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• pp.47-52
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• 2004

Greater holding force of an anchor is required for maintaining the position of a larger floating structure. According to the series of model tests of pile anchors with movable fluke, the square type pile anchor, with fluke, showed more than 6 times of the uplift pulling force, compared to the same type pile anchor, without fluke. This uplift force is 100 times its weight. When the water depth is more than 40m, It is difficult to install the pile anchor. For a convenient installation method, a type of manipulator is proposed for the separation of a weight and buoyancy controller, using TRIZ.

• Journal of The Korean Association of Information Education
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• v.13 no.2
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• pp.117-126
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• 2009

In this paper, we carry out research on the convenient and useful Science Instrument Management System in order to make the best use of the necessity of science instrument manager and the convenience of Internet. This System is expected to provide a utilization and a common ownership made list of science instruments of elementary school using XML in the position of standardized web. And we developed the Science Instrument Manage System based on XML, which can manage a science instruments under any circumstances.

• Journal of Navigation and Port Research
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• v.31 no.7
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• pp.613-621
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• 2007

As the era of ubiquitous has come, it is able to have more convenient and efficient operation system since many efforts have devoted to developing an appropriate operation system in the ubiquitous environment and applying RFID/USN technology to various parts in the industry. Also, the port logistics area has considered RFID/USN to develop more efficient port logistics environment and improve their efficiency. Therefore, this study investigates current trends of RFID technology and application cases in the port logistics area since RFID stands in the important position of changes of maritime port environment. This study tries to find possible areas for applying RFID technology and analyze expected effects when RFID is adopted those areas. Lastly, the priority level among the possible RFID application fields in the container terminal has been evaluated by experts' survey.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.3 s.96
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• pp.128-135
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• 1999

A driving simulators of aircraft and vehicle may consist of hydraulic power systems with many single-rod cylinders. The single-rod hydraulic systems are convenient but need more robust control scheme in order to achieve a reliable performance against the wide range of operating disturbances and the inherent model uncertainties. $H_{\infty}$ control scheme was implemented to the 2 degree-of-freedom hydraulic device similar to the simple driving simulator. With the reasonable disturbances from sensor, base and pump and also with the linearization of model, the simulation and experimental results showed good agreements.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.66.1-66
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• 2001

As choosing proper length of boom of container crane according as sort of vessels(18, 22, 24 columns and so on), reinforcing of capacity of DC motor to transport heavy loads, it´s structure being oversized with flexibility and durability, the study is progressing on the automation for convenient operation and effective control. We often cannot but work slowly caused by swaying(pitching, rolling) of vessel. We can get productivity and efficiency by getting over it. The factors of swaying, as fellow; - wave caused by vessels around moving - wind and wave caused by weather change - vessel´s moving by change of load weight - tide - move of vessel According to ...

• Bulletin of the Korean Chemical Society
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• v.22 no.12
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• pp.1380-1384
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• 2001

The chemoselective reactions of 1,n-dicarbonyl compounds with allyl halides using indium metal were investigated. $\alpha-Ketoesters$ such as ethyl pyruvate, ethyl 3-methyl-2-oxobutyrate and ethyl benzoylformate reacted with a variety of allyl halides i n the presence of indium to afford hydroxy unsaturated carbonyl compounds in good to excellent yields in MeOH/HCl at $25^{\circ}C.$ For the allyl bromide, the presence of various substituents at the $\alpha$ or $\gamma$ position exhibited little effects on both the reaction rates and yields. Ethyl acetoacetate or ethyl levulinate was treated with allylindium reagent to give hydroxy unsaturated carbonyl compounds in good yield. These results mean that both reactivity and selectivity are independent of the distance between carbonyl groups. 2,3-Butanedione or 1-phenyl-1,2-propanedione reacted with allylindium to produce monoallylation product as major compound.

• Archives of Pharmacal Research
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• v.23 no.3
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• pp.202-205
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• 2000

A convenient pathway for synthesis of trans-metanicotine analogues was developed. trans-Metanicotine, a subtype(${\alpha}4{\beta}2$)-selective ligand for neuronal nicotinic acetylcholine receptor, is under clinical phase for Alzheimer's disease. Zn-mediated allylation of allyl bromide and acetaldehyde followed by Heck reaction with 3-bromopyridine gave 5-pyridin-3-yl-pent-4-en-3-ol (2). Tosylation of 5-pyridin-3-yl-pent-4-en-3-ol followed by substitution reaction with methylamine in sealed tube gave methyl-(1-methyl-4-pyridin-3-yl-but-3-enyl)-amine (4) in good yields. Thus, trans-metanicotine analogues modified at the $\alpha$-position of the methylamino group with various functional groups can be obtained in 4 steps.

• Bulletin of the Korean Chemical Society
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• v.19 no.3
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• pp.314-319
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• 1998

One flask synthesis of dithienylmethane and difurylmethane is reported. The reaction of aldehydes with excess furan or thiophene affords the meso-phenyldithienylmethane (DTM) and meso-phenyldifurylmethane (DFM), respectively. The reaction is catalyzed with trifluoroacetic acid or with BF3·O(Et)2. An acyl group is selectively introduced in 1 and 9 position of difurylmethane and dithienylmethane by use of an acid chloride and tin (IV) chloride. The reduction of resulting 1,9-bisacyldifurylmethane or 1,9-bisacyldithienylmethane affords the corresponding 1,9-bis-diol. An acid catalyzed condensation of diol with meso-phenyldipyrromethane followed by oxidation with DDQ gives the porphyrins. The reaction resulted meso-5,10,15,20-tetraphenyl-21,22-dithiaporphyrin (SSNN) or 15-mesityl-5,10,20-triphenyl-21,22-dioxaporphyrin (OONN), respectively. The formation of small amount of meso-tetraphenylporphyrin (TPPH2) is also observed. The formation of TPP indicates that meso-phenyldipyrromethane is reversibly cleaved and form pyrrole and pyrrylbenzylcarbocation during the condensation. The proton nmr and electronic spectrum of the SSNN and OONN porphyrins are somewhat different from the previously synthesized meso-5,10,15,20-tetraphenyl-21,23-dithiaporphyrin (SNSN) or meso-5,10,15,20-tetraphenyl-21,23-dioxaporphyrin (ONON).