• 노동경제논집
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• 제35권3호
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• pp.29-50
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• 2012

본 연구는 최저임금이 저임금 근로자의 신규 채용에 미치는 효과를 시계 열 자료에서 추정한 결과를 제시한다. 분석 결과에 의하면 신규로 채용되는 저임금 근로자의 규모가 최저임금에 민감하게 반응하는 것으로 나타났으며, 그 효과는 여성, 고연령층 및 영세 업체 일자리에서 두드러진다. 이와 같이 최저임금이 저임금 신규 채용을 크게 위축시킬 가능성이 높다는 결과는, 단기적 고용조정의 경직성으로 인해 기존 저임금 근로자의 고용조정이 어려움에 따라 최저임금의 노동수요 위축 효과가 대부분 신규 채용의 위축으로 전가되고 있을 가능성을 시사한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.405-408
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• 1998

Due to the large conduction band discontinuity between emitter base, OmGaAs HBT has an advantge to enable the hot electrons to inject into the base. In this paper, InAlGaAs/InGaAs HBT with the various emitter junction gradings and the modified collectors are simulated and analyzed by HMC(hybrid monte carlo) simulator in order to find a optimal structure for the shortest transit time. A minium base transit time (.tau.$_{b}$ ) of 0.21 ps was obtained for HBT with the grading layer, which is parabolically graded from x=1.0 to x=0.5. The minimum collector transit time (.tau.$_{c}$ ) of 0.31ps was found when the collector was modified by inserting p$^{[-10]}$ and p$^{+}$ layers. Thus HBT in combination with the emitter grading and the modified collector layer showed the cut-off frequency (f$_{T}$) of 183GHz.z.z.

• Journal of Advanced Marine Engineering and Technology
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• 제30권3호
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• pp.444-448
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• 2006

In this paper, a frequency synthesizer for X-band FMCW radars is proposed. Some X-band FMCW radars have been used as a level sensor for tanker ship and the resolution of the level sensor may be mainly depend on linearity of frequency sweep. For a linear frequency sweep. the proposed synthesizer employs a phase-locked loop using prescalars and a high speed digital PLL chip. The measured results show that the linear frequency sweep range is from 10 GHz to 11 GHz and the output power of the synthesizer is minium 7 dBm. and the phase noise is about -80 dBc/Hz at 100 KHz offset from 11 GHz.

• 한국안전학회지
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• 제1권1호
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• pp.33-40
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• 1986

The results from a study on the combustion of the ferrosilicon-miniun delay powder which was examined under the various conditions are as follows. 1. It has been found that in case of these delay powders, decomposition of oxidiging agents occurs first and then reducing agents are oxidized by the gases evolved from the oxidizing agents and by the oxygen in air. Therefore, the main reactions are heterogenous reaction and especially He gas phase plays an important role in combustion reactions of delay Powders. 2. In case the loading pressure is below 100kg per a detonator, the dispresion of burning time is large. 3. Little or no increase in humidity was observed on daily measurement during six month preservation tests. 4. The amperage of electric current for igniting the fuse head has no effect on the burning time of delay conposition itself changed in the detonator.

• 한국결정학회지
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• 제1권1호
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• pp.8-13
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• 1990

수열육성법에 의해 인공적으로 황수정을 육성하였다. 대형의 보석용 황수정 육성기술을 확립하기 위하여 원료, 종자결정, 용제, 발색제 및 온도구배의 결정육성 요소를 상세히 고찰하였다. 구조동정, 발색, crystal form, 거시 및 미세 결함의 관찰 및 흡수 spectrum 분석을 통하여 육성된 결정의 품질을 평가하였다. 결정 육성 결과 발색이 우수하고 결함이 적은 길이 205nm, 폭 58mm, 두께 35m(무게 1kg)의 대형 황수정 육성에 성공하였다.

• 대한조선학회지
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• 제21권4호
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• pp.21-28
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• 1984

As a way of overcoming or improving the great depression in he world shipping and shipbuilding industries, a great effort has been made on the development of fuel-economic hull forms. Recently, the author(s) had presented part of the results of his study on this subject(full slow speed ships) in PRADS 83, and are presently carrying out the research program on the same subject for fine fast speed ships. This paper is the introduction and summary of the basic concept and mathematical treatment applied in this research.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.354-355
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• 2018

Flywheel energy storage system (FESS) operates motor or generator by utilizing the stored kinetic energy in the rotating mass. Thus, the FESS can support the frequency control of the power system. However, the FESS is disabled when the rotor speed reaches to its minium value. Thus, the second frequency dip occurs in the power system. This paper proposes the frequency control scheme of FESS based on a variable gain depending on the rotor speed and frequency deviation. The proposed scheme prevents the second frequency dip because the variable gain decreases depending on the stored in the FESS. The performance of the proposed scheme is investigated for the IEEE 14-bus system.

• 전자공학회논문지B
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• 제29B권9호
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• pp.8-16
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• 1992

This paper presents a method which can recognized the Handwritten Korean characters by using a Context-Free Grammar. The input characters are thinned in order to dwindle the mount of data, the thinned characters are converted into one-dimension strings according to six-forms. when the point of contact among phonemes is found, two phonemes are seperated respectively by marking the index mark (\) at the points. The Context-Free Grammar to input characters is classified into group grammars concerning the similarity of phonemes, input characters are parsed by making use of the Pushdown automata method. As the bent parts in the Handwritten characters are found frequently, We try to correct the bent parts by using the parsing distance measure, which recognize characters according to minium value caused by measuring the weight distance between two sentences. In this experiment, the recognition rate shows 93.8% to 275 Handwritten Korean characters.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.11-12
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• 2007

OVPN(Optical Virtual Private Network) based on DWDM(Dense Wavelength Division Multiplexing) backbone framework is considered as a promising approach for the future VPN. This paper proposes a new routing algorithm, called PMIPMR (Priority-based Minium Interference Path Multicast Routing) algorithm which finds an alternate route considering node priorities when the congestion is occurred in a network. The PMIPMR algorithm tries to improve blocking probability and wavelength utilization by avoiding congested path for potential future connection requests.

• 수산해양기술연구
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• 제12권1호
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• pp.7-12
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• 1976

The optical properties of the sea water were studied by use of underwater photometers in the coastal waters of Busan, from December 1975 to May 1976. The absorption coefficient of the sea water in the area ranged from 0.223 to 0.901 and the mean was 0.355. Maximum valae of monthly mean was 0.454 in December, while the minium was 0.301 in January. The transparency in winter was higher than that in spring and the mean was 4. 7 meters. The relation between absorption coefficient (m) and transparency (D) was m= 1. 67/ D. The rate of light penetration at 5 m-layer in the area ranged from 1. 73 to 24.09 percent and the mean was 13.63 percent, while the rate at 10 m-layer ranged from 0.067 to 8.05 percent and the mean was 2.95 percent.