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연구논문 : 원,정수의 부식특성에 따른 상수관망에서의 부식성 수질 모니터링
배석문 ( Seog Moon Bae ),김도환 ( Do Hwan Kim ),손희종 ( Hee Jong Son ),최동훈 ( Dong Hoon Choi ),김익성 ( Ik Sung Kim ),김경아 ( Kyung A Kim ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.7
The tap water is generally known to be corrosive in the pH range at 6.5 ~ 7.5. And the degree of corrosion varies depending on the types of raw water such as river surface water or lake water of the dam. Although several corrosion index represents the corrosivity of tap water, the typical corrosion indexes such as Langelier saturation index (LI) and calcium carbonate precipitation potential (CCPP) were calculated to monitoring the corrosive water quality about raw and tap water in water distribution system. To control the corrosive water quality, the correlation between corrosion index and water quality factors were examined. In this study, corrosion index (LI, CCPP) and the pH was found to be most highly correlated.
김영진 ( Young Jin Kim ),배석문 ( Seog Moon Bae ),송미정 ( Mi Jeong Song ),이희숙 ( Hee Suk Lee ),고재현 ( Jae Hyun Ko ),정화숙 ( Hwa Suk Jeong ),문신득 ( Sin Deuk Moon ),최진택 ( Jin Taek Choi ),노재순 ( Jae Soon Roh ),빈재훈 ( J 한국수처리학회 2011 한국수처리학회지 Vol.19 No.4
Our institute has been carried out to secure a confidence for the analysis results. As a result, we obtained a certificate of accreditation for International Laboratory Accreditation Scheme in analytical criteria of 55 parameters of drinking water quality. The Korea Laboratory Accreditation Scheme (KOLAS) also accredited our testing laboratories in accordance with the provisions of Acticle 2.021 of the National Standards. For a reliability for analytical results of water quality, a measurement uncertainty of 74 % mainly depended on the calibration curve of standard solution. Based on the mid-test results of quality assurance (QA)/ quality control (QC) for laboratory facilities, the limit of quantification for volatile organic compounds (VOC) was in the range of 2~3 ㎍/L, which was in the range of a goal value of the quality control. The R2 value of calibration curve for the VOC was 0.99. The precision and accuracy also were in the range of 1~2 % and 94~115 %, respectively. For proficiency test, we obtained an accreditation of an objective analytical ability by getting a suitable decision through a participation (total 14th times) in proficiency test, which had been held on a domestic and foreign.
생물활성탄 공정을 이용한 오존처리 부산물인 aldehyde류의 생분해 특성평가
고재현(Jae Hyun Ko),손희종(Hee Jong Son),김영진(Young Jin Kim),배석문(Seog Moon Bae),유평종(Pyung Jong Yoo),이태호(Tae Ho Lee) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.11
생물활성탄 재질별 및 안트라사이트 biofilter에서 EBCT 및 수온변화에 따른 aldehyde 4종(formaldehyde, acetaldehyde, glyoxal 및 methylglyoxal)의 생물분해 특성을 조사한 결과 EBCT와 수온을 증가시킬 경우 제거율이 상승하였으며, 수온이 25℃일 때 aldehyde 4종의 제거율은 EBCT의 영향을 크게 받지 않았으나 수온이 5℃일 경우에는 EBCT의 증가가 aldehyde 4종의 제거율 상승에 큰 영향을 미쳤다. 활성탄 재질별 BAC 및 biofilter에서 aldehyde 4종의 제거능은 석탄계-BAC>야자계-BAC>목탄계-BAC>biofilter 순으로 조사되었다. 수온 5℃~25℃, 석탄계-BAC에서 aldehyde류 4종에 대한 생물분해 속도상수(k)와 반감기(t1/2)를 조사한 결과, formaldehyde는 0.2175~0.7826 min-1와 0.89~3.19 min, acetaldehyde는 0.2068~0.9211 min-1와 0.75~3.35 min, glyoxal은 0.1468~0.3213 min-1와 2.16~4.72 min, methylglyoxal은 0.1794~0.4665 min-1와 1.49~3.86 min이었다. Aldehyde 4종에 대한 물질별 생분해율 평가 결과 formaldehyde ≥ acetaldehyde>methylglyoxal>glyoxal 순으로 나타났다. In this study, the effects of biofilter media type (three different activated carbons and anthracite), empty bed contact time (EBCT) and temperature on the removal of four aldehyde species (formaldehyde, acetaldehyde, glyoxal and methylglyoxal) in BAC filters were investigated. Experiments were conducted at three water temperature (5, 15 and 25℃) and four EBCTs (5, 10, 15, and 20 min). The experimental results indicated that the coal based BAC retained more bacterial biomass on the surface of the activated carbon than the other BACs, and increasing EBCT or increasing water temperature also increased the four aldehyde species removal in BAC filters. To achieve above 80% of removal efficiency for four aldehyde species in a BAC filter, above 15 min EBCT at 5℃ and 10 min EBCT at above 15℃ were required. The kinetic analysis indicated a first-order reaction rate for the biodegradation of four aldehyde species at various water temperatures. Data obtained from the BAC filters at various temperatures were also used to evaluate pseudo first-order rate constants for four aldehyde species. The half-lives evaluated for formaldehyde, acetaldehyde, glyoxal and methylglyoxal in the coal-based BAC ranging from 0.89 to 3.19 min, from 0.75 to 3.35 min, from 2.16 to 4.72 min and from 1.49 to 3.86 min, respectively, could be used to assist water utilities in designing and operating BAC filters.
최지향 ( Ji Hyang Choi ),허수영 ( Soo Young Hur ),배석년 ( Seog Nyeon Bae ),박종섭 ( Seong Sup Park ),남궁성은 ( Sung Eun Namkoong ),이준모 ( Joon Mo Lee ) 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.8
목적: 상피성 난소암은 성인에서 사망에 이르는 주요한 여성암 중 하나이지만, 어린이 및 사춘기에는 매우 드물다. 이러한 20세 이하의 상피성 난소암 환자의 일반적인 특징에 대해 알아보고자 한다. 방법: 1990년 1월부터 2005년 12월까지 가톨릭대학교 의과대학 강남성모병원 산부인과에서 상피성 난소암으로 진단받은 20세 이하의 환자 21명으로 대상으로 의무기록 및 수술기록, 병리 결과를 검토하였다. 결과: 전체 난소암 환자 중 20세 이하의 상피성 난소암으로 진단받은 환자는 2.2%이고, 20세 이하에서 난소암으로 진단받은 50명 중 상피성 난소암 환자는 42.0%였으며, 가장 흔한 조직학적 형태인 배아세포종양은 54%였다. 진단 시 평균 나이는 17.6세 (범위 13~20세)였으며, 추적 관찰 기간은 4~175개월이었다 (median 87개월). 조직학적 분류상 점액성 난소암 환자는 81% (10/21), 장액성 난소암 환자는 19% (4/21)였다. 경계성 난소암 환자는 8명으로 38.1%에 해당하였으며, 수술 병기상 병기I기는 85.7% (18/21)이고, 병기 III기는 14.3% (3/21)였다. 수술은 생식력을 보존하기 위한 보존적 수술을 85.7% (18/21), 광범위 수술은 14.3% (3/21)에서 시행하였다. 결론: 상피성 난소암은 어린이 및 사춘기에는 매우 드물다. 대부분의 환자는 성인에 비해 점액성 난소암의 비율이 높으며, 높은 빈도의 경계성 난소암과 낮은 분화도 및 낮은 수술적 병기에 의해 비교적 예후가 좋다. 이러한 환자에서 생식력을 보존하기 위해 보존적 수술을 시행하는 것이 받아들일 만하다. Objective: Epithelial ovarian cancer is the most common cause of death due to gynecologic malignancies in adults, but is rare in children and adolescents. This is a report of series of such patients under 20 years of age documenting their presentation, histologic type, stage of disease, treatment, and outcome. Methods: We collected data on 21 patients with epithelial ovarian cancer under 20 years of age between January 1990 and December 2005. Patient records and pathology were reviewed. Results: Epithelial ovarian cancer under 20 years of age was 2.2% in overall ovarian cancer. Epithelial ovarian cancer was 42.0% among 50 patients under 20 years of age and the most common histologic type was germ cell tumors (54%). The median age at the time of diagnosis was 17.6 years (range, 13-20 years), and the median follow-up was 87 months (range, 4-175 months). There were seventeen (81.0%) mucinous tumors, four (19.0%) serous tumors. About thirty-eight percent were low malignant potential or borderline tumors. About Eighty-five percent (18 patients) of tumors were stage I disease and about fourteen percent (3 patients) were stage III disease at the time of diagnosis. Surgical treatment included conservative surgery in 18 patients (85.7%), total abdominal hysterectomy and bilateral salpingo-oophorectomy in 3 patients (14.3%). Conclusion: Epithelial ovarian cancers are rare in patients in children and adolescents. The majority of ovarian cancers in this age group are mucinous tumors, stage I at diagnosis and borderline ovarian tumor. Conservative management is feasible to achieve preservation of fertility.