• Journal of Digital Convergence
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• v.18 no.10
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• pp.163-173
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• 2020

This study examinined the casual relationship between consulting service characteristics and management performance based on absorption capacity and innovative willingness in order to find out the factors of effective consulting In an age of infinite competition. 131 questionnaires were used to test 8 hypotheses using SPSS 22.0 and SmartPLS(3.3.2). Results are as follows: expertise and consultant knowledge among consulting service characteristics had a significant positive impact on management performance through the company's absorption capacity and innovative willingness. However, the consultant's attitude had no significant effect. This study suggests the necessary of factors that can enhance the consulting effectiveness. We would like to consider and analyze the psychological variables that can enhance the various attributes and management performance of consulting in future research.

• Korean Journal of Food Science and Technology
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• v.37 no.5
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• pp.812-815
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• 2005

Effects of poly-${\gamma}$-glutamate (PGA) on antioxidative characteristics of amino-carbonyl reaction products of glucose were investigated. Rapid browning reaction was observed under heat and alkaline condition (pH 8.2). Browning products were separated by Sephadex G-50, and brown color intensity and electron-donating ability of DPPH (2,2-diphenyl-1-picrylhydrazyl) of each fraction were measured. Fraction-7 (F-7) and -20 (F-20) showed high DPPH scavenging values. UV-VIS absorption spectrum of F-20 was similar to melanoidin peak, and F-7 showed maximum absorption peak at 270 nm. Molecular weight of F-7 was over 35 kDa as determined by SDS-PAGE. Although F-20 could not be measured on SDS-PAGE, its size was smaller than F-7.

• Korean Journal of Soil Science and Fertilizer
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• v.38 no.4
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• pp.173-179
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• 2005

A greenhouse experiment was conducted to evaluate the composition of organic acids on the bioavailability of heavy metals in the rhizosphere of corn (Zea mays L.) over 12 weeks after treatment of biosolids. After planting the plants were sampled at 12th week and analyzed for heavy metals in shoot and root and organic acids in the rhizosphere. Results showed that biomass yields of Zea mays L. grown on biosolids-treated media were significantly higher than those grown on standard media. The effect of biosolids on biomass yields of Zea mays L. was in order of Riverside ${\approx}$ Los Angeles ${\approx}$ MWRDGC > Milorganite > Nu-earth > standard media. Metal uptake by Zea mays L. was closely related with the contents contained on biosolids treated. In the plot treated with Nu-earth the uptake of Cd and Zn by shoot was significantly higher than those at the plots treated with other biosolids. The uptake patterns of Cd and Zn by root were similar to those of shoot. The uptake of Cr and Ni was significantly higher with application of Nu-earth over other biosolids. In all cases, the major organic acids in the rhizoshpere were lactic, acetic, propionic, butyric, and oxalic acids. Other organic acids were glutaric and succinic and occasionally, pyruvic and tartaric acids were also found. And the organic acid compositions did not vary significantly with the treatments of biosolids. Butyric and acetic acids were distinctively dominant both in the standard and the biosolids treatments.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.4
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• pp.31-36
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• 2019

Concrete is a material generally used to build structures and it is exposed to various environment conditions. In particular, a medium such as water lets noxious factors flow into concrete, causing a lot of damage. Therefore, different kinds of materials are being developed to increase the durability of concrete. Among such materials, silane and siloxane compound are known to have a high utilization as an absorption inhibitor. However, if aged or deteriorated reinforced concrete is treated with those compounds, they easily come off the concrete and lose their function since the basic material is weak. This study conducted an experiment to provide concrete with both an absorption-inhibiting effect and surface strengthening by using melamine-formaldehyde resins that are surface-treated with siloxane compound. In addition, a study on the porosity and surface hardness characteristics of a concrete was conducted to check the absorption-inhibiting effect and surface strengthening.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.04b
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• pp.22-25
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• 2000

ZnS:Cu,Cl 형광체의 여기 및 발광 스펙트럼 측정 결과 주게인 $Cl^-$ 이온과 받게인 $Cu^+$ 이온 사이의 흡수와 발광에 기인하는 peak과 국소화된 발광 중심인 $(CU_2)^{2+}$ 이온의 흡수와 발광에 기인하는 peak이 관측되었다. CuCl의 첨가량이 증가함에 따라 $Cu^+$ 이온의 농도가 증가하게 되어 $(Cu_2)^{2+}$ 이온에 기안하는 발광으로부터 공명 에너지 전달 (Resonant Energy Transfer)의 확률이 높아지기 때문에 513 nm를 중심으로 하는 발광의 세기가 증가하게 된다. 자체 제작한 ZnS:Cu,Cl 형광체를 이용하여 제작한 소자의 휘도 측정결과 400 Hz, 100 V 에서 CuCl 의 첨가량이 0.2 mole% 일 때 휘도가 최대였고, 진동수가 증가함에 따라 휘도가 포화되는 현상이 나타났다. CuCl의 첨가량이 증가함에 따라 513 nm를 중심으로 하는 발광이 강해지고 CIE 좌표값이 녹색영역으로 이동하게 된다. 진동수가 증가하면 인가된 전압의 유지 시간이 짧아지게 되어 발광의 감쇄시간이 긴 513 nm를 중심으로 하는 발광보다 감쇄시간이 짧은 458 nm를 중심으로 하는 발광이 강해지게 되고, CIE 좌표값이 청색영역으로 이동하게 된다.

• Proceedings of the Membrane Society of Korea Conference
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• 1997.10a
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• pp.61-64
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• 1997

1. 서론 : 적절한 이산화탄소의 분리는 지구온난화의 가속현상을 늦출 수 있을 뿐만 아니라 각종 탄화수소가스의 원료로 분리 정제된 이산화탄소를 재이용할 수 있으므로 경제적으로 매우 중요하다. 이산화탄소 분리에 사용되던 기존 공정들의 단점을 보완할 수 있는 대체방안으로 최근에 개발되기 시작한 것이 소수성의 다공성 고분자 분리막(hydrophobic porous ploymeric membrane) 방법인데, 이는 모듈의 유효 막 표면적이 상대적으로 크고 기체와 액체의 흐름을 독립적으로 제어할 수 있으므로 범람 등의 현상이 없으나 막 자체의 저항이 비교적 큰 단점을 가지고 있다. Qi와 Cussler는 이러한 특성을 가지는 중공사막 모듈에서의 기-액 흐름에 대한 물질전달 상관관계식을 얻었으며[1], Karoor 등은 여러 가지 중공사막 모듈을 사용하여 순수물과 diethanolamine(DEA) 등의 흡수제에 대한 이산화탄소의 물질전달 거동을 수치모델과 실험을 통하여 고찰하였다[3]. 또한 중공사막 접촉기의 실제적 응용에 대하여 Matsumoto 등은 화력발전소에서 발생하는 연소가스 내의 이산화탄소 흠수에 대한 연구를 수행하였다[4]. 본 연구에서는 중공사막 접촉장치를 사용하여 흡수제를 순수물과 탄산칼륨($K_2CO_3$)을 사용했을 경우의 이산화탄소의 분리 거동을 수치모델과 실험을 통하여 고찰하였다. 수치모델의 경우 이전까지의 연구가 반응이 없는 경우나 반응식을 간략화시킨 경우에 한정되었는데 비하여, 반으이 있는 경우 각각의 반응물질들의 거동을 고려한 반응식을 유도하여 해를 구하고자 하녔다.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.385-385
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• 2011

Si 또는 반도체 화합물을 기반으로 한 태양전지의 높은 원재료 가격과 복잡한 공정 등의 문제점들을 해결하기 위한 방안으로 반도체성 고분자인 Poly(3-hexylthiophene)(P3HT)과 C60 유도체인 PCBM을 광활성 층으로 이용하여 유기 태양전지(Organic Solar Cell, OSC)를 제작하였다. 하지만 상대적으로 낮은 효율을 갖는 OSC의 단점을 해결하기 위해서 유기물 자체가 갖고 있는 광 안정성, 낮은 전하 이동도 및 광 에너지 흡수대 등의 문제점들의 해결 방안들이 제시되고 있다. 본 연구에서는 광활성 층을 사용한 유기 태양전지의 특성에서 후열처리에 따른 유기 태양전지의 전기적 및 구조적, 광학적인 특성들이 소자의 효율에 끼치는 영향에 대해 분석하였다. 후열 처리 온도에 따른 광활성 층의 구조적인 특성을 분석하기 위해 EFM 이미지와 XRD패턴을 측정하였는데 열처리 후 박막의 전기적인 포텐셜과 결정성 향상의 유기 태양전지의 효율향상에 기여함을 알 수 있었다. 또한 임피던스 분석 장치를 이용해 후열 처리에 따른 소자의 Resistance, Capacitance, I-V 곡선들을 분석한 결과 최적의 조건에서 열처리된 광활성 층은 전하들의 이동을 조절하여 소자 내에서 Capacitance를 증가시키는 것 뿐만 아니라 전극과 유기물 층 사이의 계면 특성을 향상시킴으로써, 소자의 효율을 증가시키는 원인으로 작용함을 확인 하였다.

• Journal of the Society of Disaster Information
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• v.13 no.2
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• pp.213-220
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• 2017

Organic fiber reinforced concrete is applicable to many applications for construction material. In general, organic fibers have low tensile strength and elastic modulus, but they have many advantages such as high crack resistance, impact resistance, chemical resistance, flexural behavior and corrosion resistance. In this study, hybrid organic fibers were prepared by mixing polyamide (PA) fibers and high strength polyester (PET) fibers. Then, flexural performance test of fiber reinforced concrete containing hybrid organic fiber was performed. The energy absorption capacity of the hybrid organic fiber reinforced concrete was evaluated.

• Journal of Labour Economics
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• v.33 no.1
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• pp.85-107
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• 2010

In this article, since the financial crisis, Korean employment movement to service market, productivity gap between manufacturing and service industry was significant compared with other countries. The results from productivity decomposition show that negative structural changes, which employment increase is contrary to the productivity, have been intensified since the financial crisis. It is caused from a different developing pattern. While the proportion of employment was reduced, productivity has improved in manufacturing industry. While the developing was due to the high increase of the employment proportion in service industry, productivity was not improved significantly. This tendency is clearly revealed in international comparisons. In Korea the negative trend of structural changes in service industry are intensified compared to manufacturing industry after the financial crisis.

• Korean Journal of Optics and Photonics
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• v.9 no.3
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• pp.175-180
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• 1998

Nd:YAG single crystal widely used as solid state laser was grown by Czochralski method. <111> single crystal with 0.9at% of $Nd^{3+}$ was grown from the Czochralski furnace with a automatic diameter control system. The vertical temperature gradient in the liquid was the major factor that influence the crystal quality, and the crystal diameter was controlled by the home made computer program. The crystal boule with $\phi$50mm$\times$ι100mm effective size was cut, polished, and antireflection coated. The optical evaluation such as absorption spectrum, fluorescence spectrum coincide with typical features of Nd:YAG single crystal. The laser rod was assembled into the CW laser generator with a Kr lamp. The maximum CW laser output was 70 W and the threshold power and efficiency was 1.3kW and 1.64% respectively.