• Korean Journal of Logic
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• v.5 no.1
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• pp.63-79
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• 2001

반 멕기는 전건 긍정 규칙(modus ponens)에 대한 이른바 반례들을 제시하고, 이런 예는 전건 긍정 규칙이 '엄밀히 타당한'것은 아님을 보여준다고 주장하였다. 그런데 최근 들어 카츠는 이런 반 멕기의 주장을 논박하고 있다. 이 논문은 카츠의 이런 논박이 어느 정도 성공적인지를 검토하고 있다. 이를 위해 우선 반 멕기의 반례가 제시되고, 그 다음 카츠의 반박이 자세히 분석되고 정식화된다. 이런 정식화에 바탕을 두고 카츠의 논증이 평가되며, 그 결과 카츠의 논증이 흠이 있음이 드러난다. 이런 이유로 논자는 카츠의 논박이 반 멕기가 내세운 전건 긍정 규칙의 반례를 무효화하지 못했으며, 따라서 반례는 여전히 유효하다고 주장한다.

• 식품문화 한맛한얼
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• v.1 no.1
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• pp.21-24
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• 2008

• 월간 기계설비
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• s.70
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• pp.42-45
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• 1996

• 식품문화 한맛한얼
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• v.1 no.2
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• pp.24-30
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• 2008

• The Korean Publising Journal, Monthly
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• s.279
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• pp.42-42
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• 2000

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.131-133
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• 2006

A high efficiency half bridge converter for PDP in whole operation load range is proposed in this paper. The ZVS(Zero Voltage Switching) in whole load range and high efficiency in low load range is achieved because the proposed converter is switched by fixed frequency asymmetrical duty ratio and resonant operation.

• Analytical Science and Technology
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• v.8 no.3
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• pp.391-396
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• 1995

A rapid preconcentration method based on solvent extraction is described for the determination of gold by flame atomic absorption spectrophotometry. Trace amounts of gold was extracted as a new chelating agent, 3-thiophenaldehyde-4-phenyl-3-thiosemicarbazone from pH 4.0 in diisobutyl ketone. The method is simple, fast, free from the effect of many interfering ions and has a high sensitivity and a good precision. Gold is quantitatively separated and concentrated from the elements in standard sample, and the value of the recovery was 91.7 and 108.3% by the proposed method.

• The Transactions of the Korean Institute of Power Electronics
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• v.22 no.3
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• pp.207-215
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• 2017

The superior performance of the spherical actuator is establishing a new trend in the industry. Spherical actuators can perform multiple degrees-of-freedom (DOF) motions by using only one actuator. Therefore, a multi-DOF device using the spherical actuator can reduce weight and simplify the structure. This paper proposes a new spherical actuator that uses the operational principle of a rotational voice coil motor. The effectiveness of the actuator is verified through 3-D finite element method.

• The Transactions of the Korean Institute of Power Electronics
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• v.21 no.2
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• pp.134-143
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• 2016

This paper proposes a novel asymmetrical interior permanent magnet (IPM) brushless DC (BLDC) motor structure, which utilizes half-type permanent magnet (PM) configuration and has asymmetrical side gaps (slot next to the PMs) for reducing torque ripples. This structure uses 24% less volume of PMs than conventional IPM BLDC motor with a full set of magnets. The characteristics of the proposed motor are compared with three other half-type IPM BLDC motors through finite elements method (FEM) analysis, and the usefulness of the proposed motor was verified through experimental evaluation on prototypes of the conventional motor and proposed motor under various torque load conditions. This research obtained a high-performance IPM BLDC motor while decreasing manufacturing cost at the same time.

• Journal of Forest and Environmental Science
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• v.14 no.1
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• pp.128-137
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• 1998

In Fukuoka, the natural enemies of Protopulvinaria mangiferae were confirmed as six primary parasitoids, three hyperparasitoids, and six predators. Among the primary parasitoids, Aneristus ceroplastae, Microterys flavus, and Coccophagus yoshidae were relatively abundant in Fukuoka. Aneristus ceroplastae and Coccophagus yoshidae were solitary endoparasitoid, whereas Microterys flavus was a gregarious endoparasitoid. Tetrastichus sp. was a hyperparasitoid and solitarily ectoparasitic to the pupae of Aneristus ceroplastae and Microterys flavus. The seasonal fluctuation of parasitisim and adult emergence of the important parasitoids was investigated in Fukuoka. Among the predatorys, Rhyzobius forestieri and Chilocorus kuwanae were relatively abundant, and seasonal fluctuation of adult emergence and consumption of the host were studied. As the first record from Japan, Rhyzobius forestieri was collected on leaves of Elaeocarpus sylvestris with heavy infestation of Protopulvinaria mangiferae.