• Title/Summary/Keyword: 고용 영향

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An Analysis of FSK Transmission Characteristics of Spectrum Sliced Optical Signals (스펙트럼 분할된 광신호의 FSK 전송 특성 해석)

  • Ha, Eun-Sil
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.12
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    • pp.339-344
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    • 2016
  • Since transmissions of large amounts of data are frequent, users require more bandwidth, and the need for communications networks having greater bandwidth is increasing. One communications network satisfying this need is an optical communications network. Therefore, studies to increase the transmission capacity of optical communications systems have been carried out. However, in a general optical communications system, a signal transmitted through optical fiber (a transmission medium) is detected through direct detection in the receiving system. This method has a disadvantage in that the entire bandwidth of the optical signal cannot be utilized. Also, when transmitting an optical signal, there is a problem where the signal-to-noise ratio is affected by neighboring channels. To overcome this situation, various studies are being conducted to minimize the influence of external interference and noise. This paper overcomes the situation by transmitting spectrum-sliced signals using the digital transmission system, FSK. Analyzing the characteristics of the signals detected in the receiver of the optical communications system, Gaussian distribution is used for the PDF of the spectrum-sliced signal, and the signal at the receiving end of the optical communications system is assumed to have a k-square distribution. The results of the analysis confirmed it is better to transmit the spectrally divided signal rather than transmit the laser source.

온라인 증권거래 서비스의 고객만족 요인에 대한 실증적 연구

  • Choe, Don-Hwang;Hong, Jae-Beom;Yang, Jeong-Sik
    • Proceedings of the Korea Association of Information Systems Conference
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    • 2005.05a
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    • pp.161-175
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    • 2005
  • 본 연구에서는 온라인 증권거래 서비스 품질과 고객만족 나아가 고객행동을 분석한 연구이다. 이를 위해 설문조사를 실시하였으며 조사원이 직접 증권사 객장을 방문하여 운라인 증권거래경험이 있는 고객을 대상으로 설문조사를 실시하였다. 이를 위해 40개 증권사, 420여개설문이 회수되었다. 분석결과, 첫째, 온라인 증권거래를 이용하는 고객층을 분석하면, 여성보다는 남성이 온라인 증권거래를 활발히 이용하고 있으며 연령별로는 40대, 50대, 30대 순으로 나타났으며 직업은 대부분 근로생활자가 많이 활용하고 있는 것으로 나타났으며 전체 50%이상이 매일 접속하고 거래하는 것으로 나타났으며 운영 규모는 1천만원이하가 다수로 나타났다. 둘째, 온라인 증권거래 서비스 품질요인으로 지각된 신뢰성, 지각된 편의성, 지각된 유형성, 지각된 응답성 순으로 고객만족에 영향을 미치는 것으로 나타났다. 지각된 신뢰성은 약속된 서비스를 정확하게 수행하는 능력에 대한 지각으로 나타내며, 지각된 편의성은 온라인증권거래를 이용하기에 얼마나 용이한 지에 대한 지각을 나타낸다. 지각된 유형성은 물적 시설, 장비, 사람, 의사소통 도구의 외형과 같은 부분에 대한 지각을 나타내는 것이다 지각된 응답성은고객을 돕고 즉각적인 서비스를 제공하려는 의지에 대한 지각을 나타낸다. 마지막으로 고객만족은 재이용이나 구전의도에 긍정적인 효과를 미치는 것으로 나타났다. 이러한 결과는 고객지향적인 온라인 증권거래 서비스 시스템 구축 및 운영이 이용확대에 중요한 요인임을 제시한다. 본 연구는 온라인 증권거래에 대한 고객만족의 탐색적인 연구로써 보다 심도 있는 연구를 위한 기초를 제공하였다는 점과 온라인 증권거래 성과측정요소로써 고객만족에 영향을 미치는 요인을 제시했다는 점에서 의미를 지닌다.에 의해 유도된 single-strand 절단을 억제하였다. 이상과 같이 간세포 일차배양에서 양파추출물은 t-BHP에 의해 유발된 간독성, 간세포 생존율 감소, 지질과산화를 농도 의존적으로 억제시켰고 또한 t-BHP에 의해 억제된 GSH-Px, GSH-Rd 및 catalase의 활성을 증가시켰다. 이와 같이 양파추출물의 간보호 및 항산화 효과는 항산화 효소, 특히 catalase의 활성 증가와 hydroxyl radical에 의해 유도된 산화억제 및 이에 따른 지질과산화 억제에 기인하는 것으로 사료된다.chno-economic paradigm)의 시각에서 제시하는 한국경제의 성장 ${\cdot}$ 고용 ${\cdot}$ 분배를 위한 정책방향은 다음과 같은 동태적발전과정으로 요약할 수 있다 : 기초과학연구능력 확충 ${\rightarrow}$ 소화 ${\cdot}$ 흡수 ${\cdot}$ 개량 ${\rightarrow}$ 토착화 능력의 배양 ${\rightarrow}$ 자체기술개발, 선진기술 도입, 산업간 및 산업내 기술확산, 국제기술협력 ${\rightarrow}$ 기술혁신의 촉진 ${\rightarrow}$ 총요소생산성과 기업경쟁력(자원 및 역량, 프로세스 경쟁력, 품질경쟁력, 시장경쟁력, 고객성과, 시장성과, 재무성과)의 제고 ${\rightarrow}$ 가격경쟁력(임금, 금리, 물류비용, 환율 등)과 비(非)가격경쟁력(디자인, 에프터서비스, 품질, 운송 등)의 제고 ${\rightarrow}$ 국가경쟁력의 제고 ${

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The Effects of the workforce Age Structure on Productivity or Labor Costs (사업체 근로자의 연령구성이 생산성과 인건비에 미치는 영향)

  • Kim, Ki-Min
    • Management & Information Systems Review
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    • v.37 no.1
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    • pp.123-138
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    • 2018
  • In this paper, we use panel dataset from Korean linked worker-firm to analyse the effects of the workforce age structure on the productivity or labor costs. We measure 'labor productivity' as added value per capita, 'cost of labor' as labor cost per capita and estimate a dynamic panel model to study the effects of the workforce age structure on the productivity or labor costs. Empirical analysis results show that the workforce age structure is positively related to productivity and labor costs, but only up to the aged of 35-39. That is, we find that an increase in the proportion of younger workers or elder workers rather than the aged 35-39 has a negative effect on productivity and labor cost. In particular, the difference between the estimation coefficient of productivity and labor cost when the share of workers aged 50 or older is increased instead of the aged 35-39 is higher than the difference between the estimation coefficient of productivity and labor cost when the share of workers aged 30 or younger is increased instead of the aged 35-39. Our results exhibit that it is reasonable for firms to worry about declining productivity of elderly workers, whereas firms already used older workers efficiently, such as by adjusting their labor costs.

Studies on the Toxicity of Benzophenone in the Developing Chick Embryo (계배 발생과정에서 benzophenone의 독성에 관한 연구)

  • Yoo, Min;Kim, Su-Won
    • Journal of Life Science
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    • v.19 no.9
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    • pp.1309-1313
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    • 2009
  • Endocrine disruptors are chemicals which can be found in our normal daily lives. Chemicals such as bisphenol A, DDT, benzophenone and phenylphenol can be easily ingested through plastic food containers and pesticides. Endocrine disruptors can be very harmful and toxic because they disrupt the normal function of the endocrine system. It has been reported that endocrine disruptions can cause fatal strikes in the cardiovascular, reproductive, and central nervous systems, and other parts of the body. Therefore we examined if benzophenone as an endocrine disruptor inhibits development in or induces malformation of chick embryos. Chick embryos which received a single injection of benzophenone ($1{\mu}g$/egg $\sim$ $500{\mu}g$/egg) via the yolk sac at designated times (6, 9, 12, 15, 18 and 21 days after incubation) were investigated. Body weight reduction was observed in middle doses ($40{\mu}g$/egg $\sim$ $60{\mu}g$/egg). High mortality rates and teratogenic signs such as abnormal wry beak and abnormal eyeballs were seen in high doses ($80{\mu}g$/egg $\sim$ $500{\mu}g$/egg). In conclusion, it is suggested that benzophenone induces malformation of chick embryos and seriously inhibits development.

The Multisector Model of the Korean Economy: Structure and Coefficients (한국경제(韓國經濟)의 다부문모형(多部門模型) : 모형구조(模型構造)와 추정결과(推定結果))

  • Park, Jun-kyung;Kim, Jung-ho
    • KDI Journal of Economic Policy
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    • v.12 no.4
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    • pp.3-20
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    • 1990
  • The multisector model is designed to analyze and forecast structural change in industrial output, employment, capital and relative price as well as macroeconomic change in aggregate income, interest rate, etc. This model has 25 industrial sectors, containing about 1,300 equations. Therefore, this model is characterized by detailed structural disaggregation at the sectoral level. Individual industries are based on many of the economic relationships in the model. This is what distinguishes a multisector model from a macroeconomic model. Each industry is a behavioral agent in the model for industrial investment, employment, prices, wages, and intermediate demand. The strength of the model lies in the simulating the interactions between different industries. The result of its simulation will be introduced in the next paper. In this paper, we only introduce the structure of the multisector model and the coefficients of the equations. The multisector model is a dynamic model-that is, it solves year by year into the future using its own solutions for earlier years. The development of a dynamic, year-by-year solution allows us to combine the change in structure with a consideration of the dynamic adjustment required. These dynamics have obvious advantages in the use of the multisector model for industrial planning. The multisector model is a medium-term and long-term model. Whereas a short-term model can taken the labor supply and capital stock as given, a long-term model must acknowledge that these are determined endogenously. Changes in the medium-term can be analyzed in the context of long-term structural changes. The structure of this model can be summarized as follow. The difference in domestic and world prices affects industrial structure and the pattern of international trade; domestic output and factor price affect factor demand; factor demand and factor price affect industrial income; industrial income and relative price affect industrial consumption. Technical progress, as measured in terms of total factor productivity and relative price affect input-output coefficients; input-output coefficients and relative price determine the industrial input cost; input cost and import price determine domestic price. The differences in productivity and wage growth among different industries affect the relative price.

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Application of Multi-Criteria Analysis and GIS to the Coastal Assessment (GIS와 다기준분석법(MCA)을 활용한 연안지역 평가방법 연구)

  • 최희정;윤진숙;황철수
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • 2003.04a
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    • pp.510-516
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    • 2003
  • 연안관리 정책을 결정하기 위해서는 다양한 정보의 수집과 이를 체계적으로 관리하고 분석할 수 있는 기법이 필요하다. 특히, 다양한 이해집단과 목적들이 상충하는 지역의 특성을 파악하기 위해서는 환경, 사회, 경제적인 기준 및 의사결정자의 가치체계가 반영될 수 있어야 하며, 선호도가 반영된 요소를 효율적으로 분석할 수 있어야 한다. 이에, 본 연구에서는 공간자료의 처리 및 분석이 용이한 GIS 환경에 다기준 분석법, 그 중에서도 AHP 모형을 결합하는 방법을 다루어 보았다. 분석과정을 살펴보면, 본 연구에서는 지역에 영향을 미치는 사회ㆍ경제적인 지표, 환경 지표를 정하였고, 이런 지표들의 데이터를 GIS라는 도구를 통하여 분석이 용이하도록 변환시켰다. 한편, 이 지역에 영향을 미치는 각 기준들의 중요성을 파악하여 의사결정자의 의견을 반영할 수 있도록 다기준 분석법의 하나인 AHP를 이용하여 가중치를 산정하였다. 다음으로, 다양한 출처의 자료를 표준화하여 GIS의 래스터 자료로 구축한 후, 가중치를 적용한 개별 레이어를 지도대수와 중첩분석을 이용하여 최종 결과 레이어를 생성하였다. 생성된 최종 결과 레이어 상의 공간의 대안인 각 셀 값을 비교ㆍ분석하였다. 이로 인한 결과는 연안의 유한한 자원과 공간의 다양한 이용상태를 관리하기 위한 해안과 육상의 정보를 제공할 수 있다. GIS와 다기준 분석을 통합함으로써 다양한 출처의 공간정보를 분석하고 연안의 현 상태를 밝힐 수 있다. 또한, 이것은 분석 결과가 단순하고 명확하게 설명되어 정책 결정자에게 유용한 정보를 제공할 뿐만 아니라, 이 정보를 이용하여 실질적인 연안관리계획을 수립하는데 도움이 된다.가능성 0.5이상의 면적은 59%를 차지하였다.퇴적이 우세한 것으로 관측되었다.보체계의 구축사업의 시각이 행정정보화, 생활정보화, 산업정보화 등 다양한 분야와 결합하여 보다 큰 시너지 효과와 사용자 중심의 서비스 개선을 창출할 수 있는 기반을 제공할 것을 기대해 본다.. 이상의 결과를 종합해볼 때, ${\beta}$-glucan은 고용량일 때 직접적으로 또는 $IFN-{\gamma}$ 존재시에는 저용량에서도 복강 큰 포식세로를 활성화시킬 뿐 아니라, 탐식효율도 높임으로써 면역기능을 증진 시키는 것으로 나타났고, 그 효과는 crude ${\beta}$-glucan의 추출조건에 따라 달라지는 것을 알 수 있었다.eveloped. Design concepts and control methods of a new crane will be introduced in this paper.and momentum balance was applied to the fluid field of bundle. while the movement of′ individual material was taken into account. The constitutive model relating the surface force and the deformation of bundle was introduced by considering a representative prodedure that stands for the bundle movement. Then a fundamental equations system could be sim

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A Study on the Regulatory Focus, Entrepreneurial Orientation, and Entrepreneurial Intentions of College Students in Korea (대학생의 조절초점성향이 기업가정신 및 창업의도에 미치는 영향에 관한 연구)

  • Bae, Byung Yun;Lee, Joo-Heon
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.10 no.6
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    • pp.215-223
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    • 2015
  • Recently, in OECD countries, youth unemployment has become one of the most serious problems in society. Entrepreneurship creates innovative new companies that create more jobs than big traditional companies. In addition, entrepreneurship develops creative human resources leading to fertile ground for new technology and business innovation. Recently, regulatory theory has drawn a lot of attention and interest in the literature of psychology and marketing management. However, the theory has not been applied to the study of entrepreneurship. In this article, we try to examine the relationship among regulatory focus, entrepreneurial orientation, and entrepreneurial intentions of korean college students who show their interests in entrepreneurship. From our empirical study, we find the followings. First, promotion focus thriving on optimism, taking risks, and trying new actively affect positively on entrepreneurial orientation and entrepreneurial intention. Second, prevention focus concentrating on security, fulfilling responsibilities and maintaining efficiency does not always affect negatively on entrepreneurial orientation and entrepreneurial intention. In other words, prevention-focused students do not always have bad impression on entrepreneurship and may consider entrepreneurship as viable career path similar to average college students. Third, our empirical findings are consistent with previous studies that entrepreneurial intention is positively affected by entrepreneurial orientation.

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Conceptual Modeling on the Adsorption and Transport of Uranium Using 3-D Groundwater Flow and Reactive Transport Models (3차원 지하수 유동과 반응성용질이동 모델을 활용한 우라늄 흡착 및 이동에 관한 개념 모델링)

  • Choi, Byoung-Young;Koh, Yong-Kwon;Yun, Seong-Taek;Kim, Geon-Young
    • Economic and Environmental Geology
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    • v.41 no.6
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    • pp.719-729
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    • 2008
  • In this study, the speciation, adsorption, and transport of uranium in groundwater environments were simulated using geochemical models. The retarded transport of uranium by adsortption was effectively simulated using 3-D groundwater flow and reactive transport models. The results showed that most uranium was adsorbed(up to 99.5%) in a neutral pH(5.5$pCO_2(10^{-3.6}atm)$ condition. Under the higher $pCO_2(10^{-2.5}atm)$ condition, however, the pH range where most uranium was absorbed was narrow from 6 to 7. Under very low $pCO_2(10^{-4.5}atm)$ condition, uranium was mostly absorbed in the relatively wide pH range between 5.5 and 8.5. In the model including anion complexes, the uranium adsorption decreased by fluoride complex below the pH of 6. The results of this study showed that uranium transport is strongly affected by hydrochemical conditions such as pH, $pCO_2$, and the kinds and concentrations of anions($Cl^-$, ${SO_4}^{2-}$, $F^-$). Therefore, geochemical models should be used as an important tool to predict the environmental impacts of uranium and other hazardous compounds in many site investigations.

Effect of low-dose Aprotinin on Postoperative Bleeding and Renal Function after Cardiopulmonary Bypass (체외순환후 출혈감소와 신기능에 미치는 저용량 aprotinin효과)

  • 박철현;현성열;이현재;박국양;김주이;임창영
    • Journal of Chest Surgery
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    • v.31 no.1
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    • pp.32-39
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    • 1998
  • High-dose aprotinin(Hammersmith regimen) has been widely used for years to control postoperative bleeding and reduce blood consumption in cardiac surgery but had known to cause some side-effects and had disadvantage in cost-effectiveness. The prospective controlled study of 33 patients undergoing cardiopulmonary bypass was performed to evaluate the efficacy for reducing postoperative bleeding and unfavorable effects of low-dose aprotinin. The level of hemoglobin and platelet in the blood and the amount of postoperative bleeding were assessed preoperatively, and postoperatively for the study of hemostatic function. The level of BUN and serum creatinine in the blood, levels of urine creatinine, total protein, albumin, alpha-1-microglobulin and creatinine clearance were assessed before and after the operation for the study of renal function. The aprotinin group had a significant reduction in chest tube drainage; 243$\pm$ 123 ml versus 406$\pm$303 ml(P=0.037) during 6 hours immediate-postoperatively, 494$\pm$358 ml versus 869$\pm$570 ml(P=0.045) during 24 hours postoperatively. The ratio of alpha-1-microglobulin/creatinine and microalbumin/creatinine in the urine were slightly increased in the aprotinin group postoperatively in comparison with the control group but there were no statistically significant difference(55$\pm$23 versus 24$\pm$10 in the alpha-1-microglobulin/creatinine, 56$\pm$19 versus 38$\pm$25 in the microalbumin/creatinine at post- operative 3rd day). There were no significant difference between two groups in other parameters of renal function, too. This study showed that low-dose aprotinin is an effective means of reducing postoperative bleeding without inducing significant renal dysfunction.

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High temperature oxidation behavior and surface modification of Ni-based superalloys (니켈기 초합금의 고온산화거동과 표면개질에 관한 연구)

  • Seol, Gyeong-Won
    • Korean Journal of Materials Research
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    • v.4 no.2
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    • pp.166-176
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    • 1994
  • Ni base superalloys are composed of solid sohltion hardening elements(Co, Cr. Mo. W and so on) and $\gamma '$ precipitation hardening elements(A1, Ti, Nb, Ta and so on). To Improve the mechanical properties and oxidation resistanre of superalloys, rare earth elements(%r, Hf, Y and so on) are added to the inner substrate, or are used as coating materials. Their pffects on the growth rate and adhes~on of oxide are changed according to the kinds of oxides such as $AI_2O_3$ and $Cr_2O_3$. The effect of yttrium on the oxidation rate, grain size of oxide, internal structure, and crack resistance was investigated for two kinds of Ni-base superalloys. One in AF'115 superalloy containing Hf and the other is MA6000 superalloy containing $Y_2O_3$. They werr owid~zed at high temperature after yttrium surface modification using ion coater. Yttrium coating on the AF115 and MA6000 superalloys results in a marked change in the growth of the inner oxide. For AF115 superalloy, the degree of gram boundary segregation of $Cr_2O_3$, and prefer en^ tial oxidation of Hf are decreased, and the shape of inner oxidation layer was changed from triangle to plate type. For MA6000 superalloy, $Cr_2O_3$ oxide scale was transformed as outer oxidation layer of CrZOI and inner oxidation layer of $Cr_2O_3$.

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