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김태유(Tae-Yoo Kim),김석곤(Seok-Gon Kim),전찬석(Chan-Seog Jeon) 한국에너지학회 2008 한국에너지공학회 학술발표회 Vol.2008 No.-
전력량계의 소손은 절연파괴, 과부하, 수분침투 등 복합적인 요인에 의해 발생된다. 이런 요인은 전기화재 및 폭발 등의 사고로 이어져 물질적 피해뿐만 아니라 인적피해도 가져다준다. 그리고 전력량계 소손으로 정확한 전기 사용량을 측정하지 못해 전기요금을 계산하기 위해 조정 및 협정의 방법으로 전기요금을 재산정한다. 이러한 요금 산정방법은 고객의 불만과 한전에 대한 요금 불신을 초래한다. 본 논문에서는 소손 원인에 대해 사례별로 분석하여 그에 대한 대처방법을 고찰하고자 한다.
김태유(Tae-Yoo Kim),김석곤(Seok-Gon Kim),배경호(Keong-Ho Bae) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.9
본 논문에서는 현재 한전에서 사용 중인 고압 ‘기록형 전자식전력량계’에 대한 오결선 분석을 하였다. 금년도에 준공된 전력계량시험센터 내의 특고압 수전설비를 이용하여 한전 배전사업소에서 전자식전력량계 결선시에 실수로 발생할 수 있는 오결선 실험을 하였다. 그리고 계량값이 기존에 알고 있는 기계식 전력량계 오결선 해석 때 사용하던 벡터해석과는 약간 다르다는 것을 알 수 있다. 그 이유는 현재 기록형 전자식전력량계 구매 규격서의 계량방식이 단방향으로 정의되어 있어, 수전방향이 아닌 송전방향일 경우에는 계량오차가 발생한다. 현장 담당자들이 계량오차 해석 및 판단시 도움이 되도록 오결선 사례별로 실험을 하여 벡터도와 비교분석하였다.
송인성(In Sung Song),최규완(Kyoo Wan Choi),김정룡(Chung Yong Kim),고광철(Kwang Cheol Koh),김용태(Yong Tae Kim),류지곤(Ji Kon Ryu),전재석(Jae Seok jeon),장유현(Yoo Hyun Jang),김태유(Tae Yoo Kim) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.6
Intestinal lymphangiectasia is a disorder of small intestine, which is associated with dilation of intestinal lymphatics and leakage from ruptured lacteals to intestinal lumen of intestinal lymoh which contains plasma proteins, chylomicrons, and small lymphocytes. Congenital or primary intestinal lymphangiectasia is due to a malformation of lymphatic systems, whereas secondary intestinal lymphangiectasia is preceded by inflammatory or neoplastic disease and is also caused oy decrease in lymph flow from thoracic duct due to elevated pressure in the left subclavian vein, Recently we experienced a 23 year-old female patient with recurrent tetanic attacks and the features of protein-losing enteropathy confirmed by a1-antitrypsin clearance test. And with the aid of blind peroral jejunal biopsy we diagnosed her as having intestinal lymphangiectasia, showing dilated lymphatics in the lamina propria. So, we report the first adult case of intestinal lymphangiectasia confirmed by histologic findings in Korea, without apparent secondary cause.
김철용,안준영,김태유,황인성,Kim, Cheolyong,Ahn, Jun-Young,Kim, Tae Yoo,Hwang, Inseong 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.2
The efficiency and mechanism of electrochemical phenol oxidation using persulfate (PS) and nanosized zero-valent iron (NZVI) were investigated. The pseudo-first-order rate constant for phenol removal by the electrochemical/PS/NZVI ($1mA^*cm^{-2}/12$ mM/6 mM) process was $0.81h^{-1}$, which was higher than those of the electrochemical/PS and PS/NZVI processes. The electrochemical/PS/NZVI system removed 1.5 mM phenol while consuming 6.6 mM PS, giving the highest stoichiometric efficiency (0.23) among the tested systems. The enhanced phenol removal rates and efficiencies observed for the electrochemical/PS/NZVI process were attributed to the interactions involving the three components, in which the electric current stimulated PS activation, NZVI depassivation, phenol oxidation, and PS regeneration by anodic or cathodic reactions. The electrochemical/PS/NZVI process effectively removed phenol oxidation products such as hydroquinone and 1,4-benzoquinone. Since the electric current enhances the reactivities of PS and NZVI, process performance can be optimized by effectively manipulating the current.
원위치 반응존 공법 적용을 위한 대수층내 오염물질 및 환경영향인자의 계절 특성 평가
안준영,김철용,김태유,전성천,황인성,Ahn, Jun-Young,Kim, Cheolyong,Kim, Tae Yoo,Jun, Seong-Chun,Hwang, Inseong 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.6
A field investigation was conducted on an aquifer contaminated with trichloroethylene (TCE) for application of in situ reactive zone treatment using nanosized zero-valent iron (NZVI). The aquifer was an unconfined aquifer with a mean hydraulic conductivity of $5.14{\times}10^{-4}cm/sec$, which would be favorable for NZVI injection. Seasonal monitoring of TCE concentration revealed a presence of non-aqueous phase liquid form of TCE near IW (injection well). The hydrochemical data characterized the site groundwater to be a $Ca-HCO_3$ type. The average value of Langelier Saturation Index of the groundwater was -1.33, which implied that the site was favorable for corrosion of NZVI. Dissolved oxygen (DO) concentration varied between 2.5~11.5 mg/L, which indicated that DO would greatly compete with TCE as an electron acceptor. The hydrogeological and hydrochemical characterization reveals that the time around November would be appropriate for NZVI injection when water level and temperature are relatively high and DO concentration is low.
촉진탄산염화에 의한 마그네슘계 고화제의 강도 향상 특성
윤도윤,안준영,김철용,김태유,황인성,Yun, Do Youn,Ahn, Jun-Young,Kim, Cheolyong,Kim, Tae Yoo,Hwang, Inseong 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.6
MgO recently has been regarded as the alternative material for replacement of cement. The aim of this study is to investigate the effects of accelerated carbonation on the strength development of MgO-based binder which is binary mixtures of magnesium oxide (MgO) with portland cement (PC) or ground granulated blast furnace slag (GGBS) or fly ash (FA). The compressive strengths of all binders were higher in the 20% $CO_2$ condition and for longer curing time. The strength were generally higher as the following order: MgO/PC > MgO/GGBS > MgO/FA system. The binder composed of 20% MgO and 80% PC showed highest compressive strength (38.0MPa) which was higher than PC. The correlation analysis of the porosity and compressive strength showed that compressive strength was higher when porosity was lower. The hydration and carbonation products of MgO including brucite ($Ca(OH)_2$), magnesite ($MgCO_3$) and nesquehonite ($MgCO_3{\cdot}3H_2O$) presumably filled the pores and contributed to strength development. Thermogravimetric analyses elucidated that 0.34 kg of $CO_2$ could be stored the 50% MgO/50% PC binder which performed the maximum $CO_2$ uptake at 20% $CO_2$ condition.