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포항분지 제3기 이암의 도로 노체 활용을 위한 현장시험
공정식(Jeong-Sik Gong),백인우(In-Woo Baek),김재곤(Jae-Gon Kim),송영석(Young-Suk Song),김태형(Tae-Hyung Kim) 한국지반신소재학회 2021 한국지반신소재학회 논문집 Vol.20 No.3
본 연구는 성토구조체 현장실험을 통해 포항 지역의 제3기 이암을 도로 노체 재료로 활용하기 위한 가능성을 검토하는 제시하는 것이다. 이 이암은 신생대 제 3기층인 연암퇴적층에 분포하고 있는 미고결화 암석으로 슬레이킹, 팽윤 현상, 전단강도 저하와 같은 물리적 문제와 산성배수라는 화학적 문제가 발생한다. 여러 복합적 문제 해결하기 위해 실내 배합 시험을 진행하였으며 제 3기 이암(90%)과 복합슬래그(제강 70%, 고로 30%)와 중화・코팅제 처리의 최적 배합 조건을 도출했으며, 이를 실증하기 위해 실제 규모의 도로 성토구조체를 시공하여 구간별 현장 시험을 진행했다. 사전처리구간은 최적 배합 조건 설계로 인해 안정이 유지되는 반면, 무처리구간은 자연 풍화가 빠르게 진행되어 구조적 문제 발생이 우려되었으며, 가적치구간은 중화・코팅제 효과가 확인됨에 따라 임시 적치 시기에 적용 가능함을 확인했다. The purpose of this study is to present the possibility a utilization of the tertiary mudstone in Pohang as road subsoil material through pilot experiments on the road embankment structure. This mudstone is an unconsolidated rock that is distributed in the soft rock sedimentary layer, the tertiary layer of the Cenozoic, and causes physical problems such as slaking, swelling, and reduced shear strength and chemical problem like acid drainage. In order to solve various complex problems, an laboratory mixing test was conducted, and the optimal mixing conditions of the tertiary mudstone (90%), composite slag (steel making 70%, blast furnace 30%), and neutralization and coating agent treatment were derived. In order to prove its utilization, a real-scale road embankment structure was constructed and tests were conducted for each section. The pre-processing section is stable due to the design of optimal mixing conditions, while in post-processing section, natural weathering proceeded rapidly, and structural problems were concerned. Since the effect of neutralizing and coating agents was confirmed in temporary-staking section, the neutralizing and coating agents can be applied during the temporary storage period.
황철석 암버럭을 이용한 고속도로 성토체의 산성배수 처리 사례 연구
공정식 ( Jeong-sik Gong ),김태형 ( Tae-hyung Kim ),송영석 ( Young-suk Song ) 대한지질공학회 2021 지질공학 Vol.31 No.4
본 연구에서는 고속도로 공사 시 주변에 분포하고 있는 황철석이 포함된 암버럭을 성토재로 활용한 사례를 대상으로 산성배수 처리방안을 조사 및 평가하였다. 도로 시공 시 해당 성토구간에 알칼리 차수제를 이용한 중성화 공법을 적용하여 산성배수가 발생되지 않도록 하였다. 그러나 시공이 완료된 이후 장기적인 우수침투로 인하여 산성배수가 유출되어 주변의 토양과 하천을 오염시켰다. 이를 해결하기 위하여 SAPS 조 혹은 생태습지 및 모래여과시설과 같은 정화처리시설을 설치하였다. 정화처리시설 설치 후 유출부에서의 방류수와 주변 토양을 대상으로 산성배수로 인한 오염여부를 평가하였다. 유출부에서의 방류수에 대한 pH 측정 및 주변 토양의 중금속 오염 분석 결과 산성배수에 대한 중화처리가 적절하게 진행되고 있으며, 산성배수 내 존재하는 중금속에 대한 오염관리도 안정적으로 진행되고 있음을 확인할 수 있다. The treatment of acid rock drainage was reviewed and evaluated for the case of pyrite rocks distributed in a highway embankment. During the highway’s construction, neutralization using alkaline water repellent was applied to the embankment section to prevent acid rock drainage. However, it still occurred long after the construction was completed owing to rain infiltration, and the acid rock drainage polluted the surrounding soils and streams. To solve this problem, treatment facilities such as SAPS (Successive Alkalinity Producing Systems) or ecological wetlands and sand filtration were installed. After the installation of the treatment facilities, the effluent and soils contaminated by acid rock drainage nearby the outlet of the facilities were analyzed and evaluated for a period of years. Measurements of the pH of the effluent and analysis of the heavy metal contamination of the soils confirmed that the neutralization treatment for acid rock drainage is being performed properly and that contamination of heavy metals in the acid rock drainage is also being stably controlled by the treatment facilities.
각시가자미 껍질로부터 콜라겐 펩타이드 제조 및 이화학적 특성
장부식 ( Boo Sik Jang ),이미진 ( Mi Jin Lee ),정노희 ( Noh Hee Jeong ),김태형 ( Tae Young Kim ) 한국공업화학회 2013 공업화학 Vol.24 No.1
본 연구는 가자미껍질에서 콜라겐 펩타이드 파우더(FSCP)를 제조하여 시판 틸라피아비늘 유래 콜라겐 펩타이드 파우더 (TSCP)와 이화학적 특성을 비교 검토하였다. FSCP의 물리적인 특성 및 영양성분은 TSCP와 유사하게 나타났으며, 열량에 있어서도 FSCP는 3.82 kcal로 TSCP의 3.84 kcal와 차이가 없는 것으로 나타났다. 아미노산 조성은 FSCP가 TSCP보다 aspartic acid, serine, histidine, tyrosine, methionine의 경우 높았으나, hydroxyproline, proline, alanine은 오히려 낮았다. 특히 필수아미노산 함량은 FSCP가 22.74%로, TSCP의 13.64%보다 높았다. 분자량 분포는 FSCP가 1000 Da 으로, TSCP에 비하여 비교적 낮은 분포를 보이고, 유화성 및 유화안정성은 FSCP와 TSCP가 유사한 경향으로 우수하 였다. In this research, the collagen peptide powder from flatfish skin (FSCP) was prepared and compared with commercial collagen peptide powder from tilapia scale (TSCP) in the aspect of physiochemical property. The physical property and nutritional components of FSCP appeared almost similarly to those of TSCP, and also in calorie. No differences in calorie between FSCP and TSCP. Amino acid contents of FSCP for example, aspartic acid, serine, histidine, tyrosine and methionine were higher than those of TSCP. In contrast, the hydroxyproline, proline, alanine contents in FSCP were lower than those in TSCP. Especially, the content of essential amino acid of FSCP, which was 22.74%, was higher than that of TSCP evaluated as 13.64%. In the distribution of molecular weight, FSCP was 1000 Da, which showed a comparatively low distribution compared with TSCP, and in emulsion property and stability both FSCP and TSCP showed an excellent trend.
컴퓨터단층촬영술을 이용한 수술 후 편측 성대마비의 진단보고
김민수(Minsoo Kim),성현호(Hyun Ho Seong),강성식(Seong Sik Kang),손희정(Hee Jeong Son),김태형(Tae-Hyung Kim),정유선(Yuseon Cheong) 대한방사선과학회(구 대한방사선기술학회) 2018 방사선기술과학 Vol.41 No.5
VCP (Vocal Cord Paralysis) is rare but one of most serious complications related to endotracheal intubation. This report is a clinical experience of radiography and laryngeal EMG (Electromyography) assessment for the VCP. A 50-year-old woman with hoarseness, which was occurred after urethral diverticulum excision was examined by laryngoscopy. As a result of laryngoscopy, VCP was observed in left side of her vocal cord, and then recurrent laryngeal nerve damage was detected with additional CT (Computed tomography) scan and laryngeal EMG. After that, the vocal cord movement was recovered as normal state with regular conservative treatment for the 6 months.
강진식,서유원,김태형,정성균,신용승,Gang, Jin-Sik,Seo, Yu-Won,Kim, Tae-Hyeong,Jeong, Seong-Gyun,Sin, Yong-Seung 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
The effects of re-peening on the fatigue damaged material are studied in this paper. The effects of re-peening process on surface hardness, surface roughness, surface compressive residual stress, and fatigue life are investigated. The results can be summarized in brief as follows: The depth of hardening layer was increased by re-peening process. There is no large variation of the surface roughness by re-peening process. The compressive residual stress of shot-peened specimen decreases under the fatigue loading and then increases again by re-peening process. Re-peening process increases the fatigue lifo of shot-peened and fatigue damaged specimen. The increase of fatigue lift under high stress level is much higher than under low stress level.
바이오매스연료와 공기를 혼합한 예혼합화염에서의 화염전파특성과 셀 불안정성에 관한 실험적 연구
송원식(Won-Sik Song),Tran Manh Vu,박정(Jeong Park),권오붕(Oh Boong Kwon),유현석(Hyun-Seok You),윤진한(Jin-Han Yun),길상인(Sang-In Keel),김태형(Tae-Hyung Kim) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
Experiments were conducted in a constant pressure combustion chamber using schlieren system to investigate unstretched laminar burning velocities (S<SUP>o</SUP>u) and Markstein lengths in biomass derived gas?air premixed flames. Additionally, cell formations of the mixtures were obtained by analyzing high-speed schlieren images. Experimental results show that the measured S<SUP>o</SUP>u are higher than the predicted ones from GRI-Mech 3.0, especially in rich flames. Therefore, to get a better agreement between measured and predicted S<SUP>o</SUP>u at fuel-rich conditions, the rate coefficients of some important reactions were revised by adjusting the reaction rate coefficients of these key reaction steps. The flame images indicate that the GG-H and GG-L1 have similar flame wrinkle surfaces, while GG-V shows a stronger cellularity behavior. The cellular instability is promoted with hydrogen enrichment, but it is diminished with methane addition, while the similar behavior is obtained for carbon monoxide addition.
최승권(Seung-Kwon Choi),유구한,Jeong Woo Lee,Seung Il Jung,Eu Chang Hwang,Joongwon Choi,김웅빈,Jung-Sik Huh,최진봉,Yeonjoo Kim,Jae Min Chung,Ju-Hyun Shin,정재흥,정홍,배상락,김태형 대한요로생식기감염학회 2021 Urogenital Tract Infection Vol.16 No.2
Purpose: This study examined the characteristics, current treatment trends, and outcomes of patients with emphysematous pyelonephritis (EPN) in Korea. Materials and Methods: Two hundred and seventeen patients diagnosed with EPN were evaluated using abdominal computed tomography in 2011-2021 at 15 institutes in Korea. The patients’ demographic and clinical characteristics, treatment modalities, and treatment outcomes were analyzed. The total study period was divided arbitrarily into groups A (2011-2014), B (2015-2017), and C (2018-2021) to analyze the trends in the EPN treatment. Results: The mean age of the patients was 65.1 years; there were more female patients (74.2%) than male patients. The overall mortality rate was 10.6%. Ninety-five (43.8%), 98 (45.2%), and 24 (11.0%) patients were treated with medical, minimally invasive, and surgical management, respectively; the corresponding mortality rates were 13.7%, 6.1%, and 16.7%. There was no significant change in the proportion of patients treated with medical management over time (group A=46.5%, group B=47.0%, and group C=38.8%). The proportion of patients treated with minimally invasive management gradually increased over time (group A=35.2%; group B=43.9%; group C=55.0%), while those who underwent surgical management decreased gradually over time (group A=18.3%, group B=9.1%, and group C=6.3%). No differences in mortality rates were observed between the groups. Conclusions: EPN with medical and minimally invasive management had a relatively high treatment success rate, which increased gradually, while surgical management decreased gradually over time in Korea. The mortality rate was relatively lower than that reported in studies published before the 2010s.
극저온용 공기 흡입장치의 Louver 형상에 의한 유동해석
고지원(Ko jee-Won),박재현(Park Jea-Hyoun),김정환(Kim Jeong-Hwan),문경은(Mun Gyeong-Eun),김태형(Kim Jeong-Sik) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This study is analysis to the Lover of Cryogenic Air Inhalation. The result according to the temperature difference at the inlet side and outlet side, we confirm to it is suitable for the Cryogenic environment.