情報通信技術 擴散이 賃金不平等의 한 原因인가?

徐煥周,許栽準,田炳裕,李榮洙 한국국제경제학회 2004 국제경제연구 Vol.10 No.1

본고는 산업 및 사업체 수준의 자료를 이용한 Mincer류의 임금방정식 추정을 통해 산업간 혹은 사업체간 상이한 수준의 ICT 확산이 동일직능집단 내 임금불평등 확대 및 고직능-저직능노동간 임금불평등 확대에 기여하는지를 탐구하였다. 그 결과 ICT 확산속도의 차이가 부문간 임금격차 확대를 통해 동일직능 집단내 임그불평등 확대에 기여함을 알 수 있었다. 또한 ICT 확산속도의 차이가 집단간 임금불평등 확대에도 기여함을 명시적으로 확인할 수 있었다. 이상을 종합해 볼 때 기술변화속도가 급격한 시기에는 노동수요구조가 고용아정성 및 소득분배 상황을 양극화시키는 경향을 띠므로 근로자의 직업교육 및 직업경험 기회를 확대하고, 저직능근로자에 대한 사회안전망의 충실도를 제고하는 등의 정책적 배려를 강화해야 할 필요가 있다고 하겠다. This paper explores, using the traditional Mincer-type earnings equation augmented by a proxy for ICT progress, whether the differing pace of Information and Communication Technologies (ICT) has an effect on both within- and between-group wage inequalities. We found that the pace of ICT progress caused the widening of both within- and between-group wage inequalities. An important policy implication of this finding is that as the forces of labor demand tend to increase wage inequalities among workers at least until the pace of ICT progress stabilizes, policy measures to provide more opportunities for training and job experience for workers and the extension of the social safety net for vulnerable workers are necessary.

폐비닐여재를 적용한 부착성장식 공법의 유기물 및 영양염 제거 특성

서종환,김진우,안철우,이철승,박진식,김수생 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2

This study was carried out to demonstrate the removal characteristics of organic materials & nutrients in attached growth process applied Synthetic Wasted Polyethylene Media which is reused from wasted vinyl in rural. The results are as follows: 1. Removal efficiencies were indicated COD_(cr), 91.4, 92.4, 93.9%, T-N 56.9, 61.4, 65.1% and all T-P 45% or more with HRT 10, 12, 14 respectively. 2. It is indicated BOD volume load 0.18~0.40kg/ ㎥ ·d, COD volume load 0.28~0.53kg/ ㎥ ·d and NH₄-N volume load 0.12kg/ ㎥ ·d respectively. In conclusion, It is showed activated sludge process is replaced with this process applied Synthetic Wasted Polyethylene Media and this process is considered the methods that solve wasted vinyl troubling in a rural.

승모판 폐쇄부전증 이환견에서 심장 Troponin I의 예후평가의 중요성

전서강,임수정,김덕환 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1

We investigated the relations between serum cTnI concentration and the prognosis in four dogs which admitted to the Veterinary Medical Teaching Hospital of Chungnam National University with clinical signs such as couching, respiratory distress, anorexia, and/or syncope and were diagnosed as a mitral valve insufficiency. While serum cTnI concentration was less than 2.0 ng/ml in case 1,2 and 3, it was 2.5 ng/ml in case 4 which showed the most grave prognosis. Thus, it is assumed that increased concentration of serum cTnI in dogs with mitral valve insufficiency could be an indicator to evaluate patients' prognosis.

미기상규모 영역의 온실기체 승온효과에 관한 수치연구

이순환,서광수,김동희,황수진 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.3

The change of land use such as the construction of way in mountainous area and tunnel leads to the quantitative change of the greenhouse gas. This study tried to clarify the effect of the change of land use around Miryang Ice Valley on thermal environment of micro-meteorological scale by numerical experiment. We carried out several numerical experiment under different atmospheric conditions with different amount of greenhouse gases. Heating rate increased by the greenhouse gas in the ground level is average of 0.0073 K/day. And the increasing rate is smaller than the daily average heat crossing quantity.

유산양 유방염에 대한 Chitosan 약침의 치료 효과

황수현,서진석,김덕환,김명철,신상태,전무형,南三郞,김영찬,이우근,표수일 충남대학교 수의과대학 동물의과학연구소 1999 動物醫科學硏究誌 Vol.7 No.-

To improve the therapeutic method for mastitis, treatment effect of chitosan pharmacopuncture was examined in three milking goats(A,B and C). Mastitis was artificially induced in two milking goats(A and B) and one goat(C) was naturally infected case with mastitis. The acupoint used was Yang-Ming and chitosan suspensions(provided from Tottory University, Japan: 30㎎ of chitosan/㎖)were injected to the acupoint with 5㎖/time for 3 days, respectively. As for the change of somatic cells in milk along with chitosan pharmacopuncture, they showed a decreasing tendency after increase on the 3rd day in all udders of B. In addition, as for the change of total leukocyte counts of peripheral blood with chitosan pharmacopuncture, they showed a decreasing tendency after increase on the 3rd day in B and C except A which showed a increasing tendency until on the 7th day. In the change of neutrophil/lymphocyte(N/L) ratio, increasing tendency was seen in A and C but increasing tendency after slight decrease was observed in B. Further, in the change of serum total protein and A/G ratio, serum total protein content was decreased after slightly increase on the 3rd day in A, and they were decreased after increase until on the 7th day in B and C, respectively. As for the change of A/G ratio, different pattern increasing tendency was shown in A, B and C.

암석 류의 파괴인성계수의 측정과 해석방법에 관한 연구

백환조,서백수 江原大學校 産業技術硏究所 1996 産業技術硏究 Vol.16 No.-

암석의 파괴인성계수는 암석이 갖는 불균질성 및 비등방성에 의하여 시험조건에 따른 측정자료의 분산이 심하다. 즉, 시험편의 형태나 크기에 따른 변화가 심하여 기준의 선형탄성 파괴역학 이론의 적용에 문제점이 있는 것으로 지적되고 있다. 이러한 자료의 분산을 최소화하기 위한 방법의 하나로 균열감용도를 적용한 해석을 제시하고 있다. 균열감 용도란 파괴역학 실험 당시 시험편에 가해진 인공 균열의 감응도를 말하며 이는 3점 하중에 의한 파괴가 균열의 성장에 의한 파괴인지, 혹은 단순히 인장파괴에 의한 것인지를 판명함으로써 측정자료의 선택을 명확하게 하기 위한 방법의 하나로 적용될 수 있다.

천연항균성 물질을 이용한 Vibrio vulnificus의 살균 및 독소생성 억제효과

조성환,서일원,최종덕,전상수,라택균,정수근,강동훈 國立統營水産專門大學 附設 水産科學硏究所 1993 수산과학연구소보고 Vol.4 No.-

생선회용 해산물에 오염되어, 생식한 경우 발생되는 패혈병의 원인균주인 Vibrio vulnificus의 생육 및 독성생성을 억제할 목적으로 천연 항균제인 Grapefruit종자추출물(GPSE)을 이용하여 그 항균효과를 검토하였다. In vitro 시험결과, Vibrio vulnificus에 대한 GFSE의 생육최소저해농도는 50~100 ppm 정도이었으며, Vibrio vulnificus 균체세포틀 100 ppm 농도의 GFSE 용액으로 처리하고 전자현미경 촬영시료로 조제하여 촬영한 후, 미생물형태을 무처리대조구와 비교, 검토한 결과, GFSE 처리로 세포막 기능이 파괴되어 세포내용물이 균체외부로 유출되어 균체의 생육이 억제되고 균체내부가 빈 ghost 형태의 균체수가 증대되어 GFSE의 항균효과를 확인할 수 있었다. 한편, 생선회용 해산물에 GFSE를 근육주사하고 Vibrio vulnificus를 접종한 수조내에서 사육하여 채취한 어육부를 마쇄하여 일정량씩을 표준사료에 첨가해서 통닭용 병아리를 실험동물로 하여 사양실험을 실시한 결과. 체중증가율, 단백질이용효율, 혈청내 효소활성, 혈청의 주요성분함량 등에 있어서, GFSE 처리수조내에서 사육한 해산물을 첨가한 시료시험구의 경우, 무첨가사료처리구와 비교할 때 뚜렷한 차이를 목격할 수 없었으며, GFSE 첨가에 따른 실험동물의 성장저해 또는 독성현상을 유발하지 않음을 알 수 있었다. 아울러, 각 처리구에서 사양한 해산물의 어육부에 오염된 Vibrio vulnificus의 균수를 측정한 결과, 250ppm 이상의 GFSE 처리구에서는 Vibrio vulnificus를 전혀 검출할 수 없었다. To prevent food-poisoning outbreaks by Vibrio vulnificus the antimicrobial efficacy of grapefruit seed extract (GFSE) was examined. Minimal inhibitory concentration (in vitro) for the microorganism was found to be 50~100 ppm. Transmission electron micrographs of Vibrio vulnificus showed the biocidal action of this natural antimicrobial agent would be related to specific respiratory effect coupled with the destruction of permeable function of microbial cell membrane. After Anguilla japonia GFSE-injected to the body was incubated in the seawater contaminated by Vibrio vulnficus the fish meats were taken up, mixed with control diet and used as a diet in the feeding experiment. In this experiment the effect of GFSE treated with fish muscle on body weight protein efficiency ratio, serum enzymes and serum blood component of broiler chicks was investigated. It is proved from this study that there is neither Vibriosis nor toxicity associated with GFSE itself and fish meats treated with it when it is injected to the fish body at a level of 250 ppm or less.

습지의 간척에 따른 환경·생태적 기능가치에 대한 비교

조한진,서종환,이철승,안철우,김수생 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2

This study on the environmental-ecological functional value of reclaiming from wet land for a standard of refutation on development and preservation. Korean wet land gives us seafood, social and cultural service of human and livelihood to be self-supporting the foods, supports etc, but at the same time wet land has ecologically sensitive and irreversible features. So we need to have maintainable management strategies considered the safe minimum standards. But Korean wet land has been developed 30% since 1980, and other wet land remain undeveloped has been pressured to develop. Pre-studies have been careless about the negative functions about water quality of paddy. But by the results of this study, we can know that total economic values are negative effects. The negative effects of environment pollution are bigger than the affirmative. And we need to compare and analyze the economic value of wet land and reclaimed land in order to produce more exact cost-benefit analysis on the preservation and development. But when we consider economic value of the liquid-quality purification between wet land and reclaimed land, the value of wet land is greater than reclaimed land.

뇌동맥류의 진단에 대한 전산화단층촬영 뇌혈관조영술과 고식적 뇌혈관조영술의 비교

송상현,윤수한,안영환,안영민,조기홍,조경기,김선용,서정호 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.10

Cerebral angiography has been essential for the diagnosis of the intracranial aneurysms but. is sometimes accompanied by serious complications. Resolution of CT angiography was up-graded greatly to represent the three-demensional structure of vesseles since helical CT had been introduced. We have compared 26 cases of CT angiography and 28 cases of conventional angiography in terms of specificity and sensitivity for the diagnosis detectable aneurysm diameter. configurational diagnosis and diagnostic confidency. All results showed no statistical difference between CT angiography and conventional angiography. These should suggest that CT angiography could be replaced with conventional angiography for the diagnosis of ruptured aneurysms and even of unruptured aneurysms. resulting in the introduction of first screening modality of unruptured aneurysms.

NaOH 첨가에 따른 음식물찌꺼기 고온 혐기성 산발효

안철우,이철승,서종환,박진식,문추연,장성호,김수생 한국환경농학회 2004 한국환경농학회지 Vol.23 No.4

본 연구는 음식물찌꺼기의 혐기성 산발효에 있어 여러 조건들 중 온도가 효율적인 가수분해와 산발효에 미치는 영향을 검토하기 위해 고온(55℃)과 중온(35℃)에서 각각 실험을 수행하여 다음과 같은 결론을 얻을 수 있었다. 음식물찌꺼기의 혐기성 산발효시 산생성 효율을 높이기 위한 전처리 과정으로 음식물찌꺼기에 NaOH를 투입한 결과 가수분해효율을 표현한 가용화 정도(Solubilization)가 0.01 g NaOH/g TS이하로 투입된 경우 0.01 mgSCOD_(prod)/mgICOD_(inf)이하를 나타내었으나, 0.05 g NaOH/g TS이상을 투입했을 때는 0.07~0.09 mgSCOD_(prod)/mgICOD_(inf)로 나타났다. 따라서 음식물찌꺼기에 NaOH를 투입하여 효율적인 가수분해가 이루어지기 위해서는 g TS당 0.05 g이상의 NaOH가 투입되어야 할 것으로 판단된다. 음식물찌꺼기를 NaOH로 전처리한 후 고온(55℃) 산발효를 실시했을 때 0.05 g NaOH/g TS 투입시 SCOD의 증가치 3,800 mg/L로 최대의 가용화와 산생성에 효과적인 pH 5.95를 얻을 수 있었다. 0.05 g NaOH/g TS를 투입하여 중온(35℃)에서 산발효를 실시한 경우와 비교하여 SCOD 증가치가 약 5배 정도 높았고, 최대 가용화에 이르는 시간도 중온의 2/3 정도로 짧아 음식물찌꺼기의 가용화에는 고온이 효과적인 것으로 나타났다. NaOH 0.05 g NaOH/g TS로 전처리된 음식물찌꺼기의 산발효 결과 고온(55℃) 및 중온(35℃)에서 각각 반응시작 후 72시간에 12,600 mg/L, 120tlrksdp 9,800 mg/L의 VFA농도를 나타내어 동일기질을 이용하여 산발효를 실시했을 때 중온보다는 고온에서 미생물의 활성증대와 유기물의 가수분해가 촉진되어 VFA생성이 효율적인 것으로 판단되었다. 고온에서 NaOH에 전처리된 음식물찌꺼기를 산발효 시켰을 때 VFA가 가장 높았던 시점을 기준으로 VFA의 조성을 조사한 결과 acetic acid가 45.9%, butyric acid가 26.7%, propionic acid가 13.9% 등으로 총 유기산 발생량의 86.5%를 차지하였다. This study showed that thermophilic anaerobic acid fermentation of food wastes had an enhanced hydrolysis capability and improvement of acidification efficiency. Influence of pH on the anaerobic hydrolysis and acidogenesis was investigated to determine the proper alkalinity in the thermophilic fermentation of food wastes. The results of putting NaOH as alkali to evaluate hydrolysis and acid fermentation efficiency in acid fermentation process of food wastes showed that the food wastes pretreated with 0.05 g NaOH/g TS had the maximum 12,600 mg/L of VFAs concentration during HRT 3 days in 55℃ hermophilic condition and the maximum 9,700 mg/L of VFAs concentration during HRT 5 days in 35℃ mesophilic condition. The accomplishment of high VFAs concentration resulted from that the main component of food wastes such as cellulose, lignin and etc. is performed active chemical decomposition by alkali in thermophilic condition. The major components of VFAs produced from the thermophilic acid fermentation process of food wastes were the short chain fatty acids such as acetic acid, butyric acid, and propionic acid.