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박재현,우보명,김우룡,안현철,조현서,추갑철,김춘식,최형태,Park, Jae-Hyeon,Woo, Bo-Myeong,Kim, Oue-Ryong,Ahn, Hyun-Chul,Cho, Hyun-Seo,Choo, Gab-Chul,Kim, Choon-Sig,Choi, Hyung-Tae 한국환경복원기술학회 2001 한국환경복원기술학회지 Vol.4 No.3
This study was conducted to investigate physicochemical property changes from July 1998 to August 2001 in Mt. Bukhansan National Park. Four water sampling points were selected to measure the quality of stream water in the northeastern part of the Mt. Bukhansan National Park. The results were summarized as follows; In spring, the average pH of stream water was below the first class of the river water quality standard, while it was normal level in summer. The average electrical conductivity was about 2.3~3.3 times higher in downstream water than in upstream water during spring and summer. The contents of anions($Cl^-$, $NO{_3}^-$, $SO{_4}^{2-}$) were about 1.1~7.4 and 0.4~11.4 times higher in downstream than in upstream water, respectively. These results indicate that water quality was poorer in downstream than in upstream water. We suggest that stream water in the Mt. Bukhansan National Park should be protected from impacts of snow melting mineral particles in spring season and human impacts like wastewater of point source in summer season.
갑상선 절제 수술 후 Guardix-SG<SUP>Ⱂ</SUP>의 유착방지 효과
박재현,정종주,강상욱,남기현,장항석,정웅윤,박정수,Jae Hyun Park,M.D.,Jong Ju Jeong,M.D.,Sang Wook Kang,M.D.,Kee Hyun Nam,M.D.,Hang Seok Chang,M.D.,Woong Youn Chung,M.D. and Cheong Soo Park,M.D. 대한갑상선-내분비외과학회 2009 The Koreran journal of Endocrine Surgery Vol.9 No.3
Purpose: Postoperative adhesion of the surgical field seems to be troublesome not only to the patients, but also to the surgeons. Guardix-SG<SUP>Ⱂ</SUP> is a poloxamer/alginate mixture that reduced the incidence of postoperative adhesions when it is added to the abdominal surgery in animal models and also in clinical trials. This study was a randomized, prospective, double-blinded study to evaluate the antiadhesive efficacy and safety of Guardix-SG<SUP>Ⱂ</SUP> after total thyroidectomy. Methods: A total of 89 patients who underwent total thyroidectomy between July 2008 and February 2009 in Severance Hospital and Gang-Nam Severance Hospital were randomized to either the Guardix-SG<SUP>Ⱂ</SUP> treatment group (n=45) or the non-treatmentcontrol group (n=44). The patients were asked about their clinical symptoms (hypesthesia or paresthesia on the operative site (SN) and swallowing discomfort (SW)) by using a questionnaire, and the swallowing function was evaluated using Marshmallow Esophagography by one physician. The clinical symptoms and Marshmallow Esophagography were scored according to the results of assessment. The most severe state was scored as 0 and normal was scored as 3. Results: The scores of the clinical symptoms (SN and SW) were 2.67 and 2.49 in the treatment group, and 2.09 and 1.80 in the control group, respectively, at the postoperative 6th week (P=0.001, <0.001). The scores of the Marshmallow Esophagography were 2.93 in the treatment group and 2.73 in the control group (P=0.033). Abnormal findings were seen in 2 patients (4.4%) in the treatment group and in 10 patients (22.7%) in the control group (P=0.014). Conclusion: Guardix-SG<SUP>Ⱂ</SUP> seems to be effective in preventing adhesion after thyroidectomy. Further studies involving a larger number of subjects will be needed to make an application guideline. (Korean J Endocrine Surg 2009;9: 127-132)
溫肺湯과 溫肺湯去총白의 抗알레르기效果 및 鎭痛, 解熱作用에 대한 實驗的 硏究
박재현,채병윤,Park, Jae-Hyun,Chae, Byun-Yoo 대한한방안이비인후피부과학회 2001 한방안이비인후피부과학회지 Vol.14 No.2
Major symptoms of al1ergic rhinitis are nasal obstruction, sneezing and watery rhinorrhea. Onpyetang has been used to treat for nasal obstruction, which is one of the symptoms of allergic rhinitis. This Experimental study was done to research effects of Onpyetang and transformed Onpyetang(Allii Radix is deducted from Onpyetang) on the anti-allergic effects. We have studied the vascular permeability response induced by serotonin and histamine, the contact dermatitis response induced by picryl chloride, the delayed type hypersensitivity response to SRC, the mice paw edema induced by carrageenin, the writhing syndrome induced by $0.7\%$ acetic acid, and the rectal temperature in febrile rats induced by yeast. The results were as follows : 1. In the vascular permeability response to intradermal serotonin and histamine. Onpyetang proved significant inhibitory effect(P<0.05, p<0.001) But transformed Onpyetang proved significant inhibitory effect only to histamine(P<0.05) 2. In the contact dermatitis response induced by picryl chloride, Onpyetang and transformed Onpyetang proved significant inhibitory effect.(P<0.05, P<0.05) 3. In the delayed type hypersensitivity response induced by SRC, Onpyetang and transformed Onpyetang proved significant inhibitory effect on mice paw edema.. (P<0.05, P<0.05) 4. In the delayed type hypersensitivity response induced by SRC, Onpyetang proved significant inhibitory effect to serum IgE.(P<0.01) But transformed Onpyetang proved insignificant inhibitory effect on serum Ig E. 5. In the mice paw edema induced by carrageenin, Onpyetang and transformed Onpyetang proved significant anti-inflammatory effect. (P<0.01, P<0.01) 6. In the writhing syndrome induced $0.7\%$ acetic acid, Onpyetang and transformed Onpyetang proved significant analgestic effect. (P<0.01, P<0.01) 7. In the rectal temperature in febrile rats induced by yeast, Onpyetang and transformed Onpyetang proved significant anti-pyretic effect.(P<0.001, P<0.01) according to this result Onpyetang was conclude to be effective on anti-allergic, anti-pyretic, anti-inflammatory and analgestic action. but transformed Onpyetang(Allii Radix is deducted from Onpyetang) was not effective on the vascular permeability response to intradermal serotonin and increasing Ig E of delayed type hypersensitivity response induced by SRC. In addition, transformed Onpyetang is not effective as Onpyetang. More study should be done about the role of Allii Radix.
수평형 HRSG의 탈질설비에서 암모니아 분사위치 변동에 따른 암모니아 유량비교
박재현,유호선,Park, Jae-Hyun,Yoo, Hoseon 한국플랜트학회 2018 플랜트 저널 Vol.14 No.4
발전설비에서의 질소산화물 배출 규제치가 강화됨에 따라 1990년대에 설치된 HRSG도 탈질설비를 추가로 설치해야 하는 상황이 되었다. 그러나 HRSG 내부에 촉매와 암모니아 분사장치 모두를 설치할 수 있는 공간이 없기 때문에 그 대안으로써 HRSG 내부에는 촉매만 설치하고 암모니아 분사장치는 가스터빈 배기덕트로 변동하여 설치하는 것을 검토하였다. 본 연구에서는 인천복합발전소를 대상으로, 암모니아 분사장치를 HRSG 중압 과열기 후단과 가스터빈 배기덕트에 설치하여 암모니아를 분사였을 때 대기 배출기준 8.5 ppm을 만족하는 암모니아 소비량을 각각 측정하였다. 연구결과 가스터빈 배기덕트 암모니아 분사방식이 HRSG 중압 과열기 후단 분사방식에 비해 소비량이 1.2배 정도 증가한 것으로 나타났다. 따라서 HRSG 수명 30년 운영을 고려한다면 HRSG 내부에 암모니아 분사장치를 설치할 수 없는 경우 가스터빈 배기덕트에 암모니아 분사장치를 설치하는 것이 추천된다. As the emission limits for NOx in power generation facilities were strengthened, HRSGs installed in the 1990s became necessary to install additional DeNOx system. However, since there is no space in the HRSG for installing the entire the catalyst and ammonia injection grid, as an alternative, the catalyst was installed inside of the HRSG and the ammonia injection device was installed in the exhaust duct of the gas turbine. Experiments were conducted in horizontal HRSG of Incheon combined cycle power plant. Experimental results show that the ammonia injection method in the gas turbine exhaust duct is 1.2 times higher than the HRSG internal ammonia injection method. However when operating a HRSG for 30 years as its life span, ammonia injection method in the gas turbine exhaust duct is more economical than the cost of new HRSG construction.
박재현,정재희,이아원,송영택,Park, Jae-Hyun,Jung, Jae-Hee,Lee, Ah-Won,Song, Young-Tack 대한소아외과학회 2001 소아외과 Vol.7 No.2
Clear Cell Sarcoma of the Kidney(CCSK) is a rare malignant childhood tumor with frequent metastasis to the bone. We report a case of right sided in a 5 month-old girl. A radical nephrectomy was performed. It was clinical stage III with renal capsular invasion and lymph node metastasis by the classification of NWTS-5. Histologic examination revealed the classic pattern of CCSK. Postoperative adjuvant chemotherapy with doxorubicin and radiotheraphy were applied.
박재현,김병길,정현주,최인준,Park Jae-Hyun,Kim Pyung-Kil,Jeong Hyeon-Joo,Choi In-Joon 대한소아신장학회 1997 Childhood kidney diseases Vol.1 No.1
목적 : IgA 신병증은 다양한 임상 소견을 보일 수 있으며 초기에는 대부분 예후가 양호한 것으로 알려졌었으나 현재는 발병 20년후 20-30%가 말기 신부전증을 초래한다고 알려져 있다. IgA 신병증의 예후를 예측하기 위한 여러 조사에서 발병 초기의 심한 단백뇨, 고혈압, 조직 병리학 상의 심한 변화 등이 있을 경우 예후가 나쁘다고 하였다. 1996년 Yagame등은 IgA 신병증에서 새로운 조직 병리학적 분류를 하였고 WHO 분류 방법이 사구체 병변을 중심으로 한데 비해 세뇨관과 간질의 변화까지 포함하고 있어 이들의 분류 방법이 더 우수하며 추적관찰 결과 만성 신부전의 예후 인자로써 유용하다고 발표하였다. IgA 신병증에서 임상 증세, 검사 소견, WHO 및 Yagame 등의 조직 병리학적 분류 등과 추적 관찰시 만성 신부전과의 상관 관계를 알아보고자 하였다. 방법 : 1984년 1월부터 1996년 2월까지 소아과에 입원하여 신생검상 메산지움에 IgA가 현저히 침착되어 있어 IgA 신병증으로 진단된 환아 79명을 대상으로 평균 27개월의 추적관찰시 신 기능이 정상인군(73례)과 만성 신부전으로 진행한 군(6례)을 서로 비교하여 IgA 신병증에서의 예후 예측 인자에 대하여 알아보고자 하였다. 결과 : 1) 성별, 나이, 증상기간 등은 양군간 차이가 없었으나 내원시 고혈압이 있을 경우 만성 신부전으로의 진행이 많았다. 2) 내원시에 여러 임상 검사중 심한 단백뇨가 만성 신부전으로의 진행이 많았다. 3) WHO 및 Yagame 등의 조직 병리학적 분류 모두 소아 환자에서는 예후와의 관련을 찾을 수 없었다. 결론 : 이상의 결과로 보아 IgA 신병증 환아에서 내원시에 심한 단백뇨, 고혈압이 있을 경우 추적 관찰 결과 예후가 좋지 않았다. 그러나 본 연구의 경우 치료에 대한 평가가 이루어지지 않았고 대상 환아가 적었기에 향후 이를 포함하는 광범위한 연구가 진행되어야 할 것으로 사료된다. After the first description of IgA nephropathy by Berger in 1968, the prognosis of this disease was considered favourable. However recent studies have revealed that IgA nephropathy result in end stage renal desease in 25-30% by 20 years. Heavy proteinuria, hypertension, histological high class are regarded as poor prognostic factors. In 1996, Yagame et al reported the new histopathologic grading with a strong correlation between the grading, heavy proteinuria, high s-Cr level and renal survival. The aims of this study are to determine whether the pathological grading and other clinical parameters could contribute to predicting the outcome of this disease eventhough pediatric patients. Seventy nine patients (59 males, 20 females) with IgA nephropathy were examined. Patients were 2.08-15.17 years of age ($9.85{\pm}2.83$). The mean follow-up duration were $27{\pm}28$ months. Six of seventy nine patients progressed to chronic renal failure during the follow-up periods. High 24h urinary protein excretion at diagnosis were significantly higher in chronic renal failure patients (p<0.05). Hypertension at diagnosis were the significant associated factors in progression of chronic renal failure (p<0.05). Histological changes of IgA nephropathy in light microscopy were classified into five classes by WHO classification, four grades in Yagame's gradings. Among the seventy nine patients, 24 were as class 1, 30 as class 2, 23 as class 3; 4 as class 4, 0 as class 5 by WHO classification. 23 were classified grade 1, 31 as grade 2, 24 as grade 3, 1 as grade 4 by Yagame's grading. Among six patients who progressed to chronic renal failure, 1 clssified as class 1, 1 as class 2, 3 as class 3, 1 as class 4, 0 as class 5 by WHO Classification. 1 patients were classified as grade 1, 1 as grade 2, 3 as grade 3, 1 as grade 4 by Yagame's grading. (p>0.05) In conclusion, hypertension and heavy proteinuria at initial presentation were significantly associated with progression of chronic renal failure. The classification of WHO & Yagame's grading has no significant association with the progression of chronic renal failure in pediatric patients.
당뇨병 환자에서 관절경적 회전근 개 봉합술 후 발생한 화농성 견관절염의 치료 - 증례 보고 -
박재현,최원기,김세식,최창혁,Park, Jae-Hyun,Choi, Won-Ki,Kim, Se-Sik,Choi, Chang-Hyuk 대한관절경학회 2009 대한관절경학회지 Vol.13 No.1
당뇨환자로서 관절경적 회전근 개 봉합술을 시행 후 견관절의 화농성 관절염으로 진단된 2예에 대해 관절경적 치료 및 추가적인 개방성 치료를 시행하였다. 관절경적 회전근 개 봉합술 후 감염은 평균 18일 뒤에 발생하였으며, 증상 발현으로부터 수술까지의 평균 기간은 65일이었다. 또한 기능 평가는 KSS, ASES, UCLA, Constant 점수를 이용하였다. 관절경적 변연 절제술과 추가적인 시술 후 평균 22.5일의 항생제 치료로 4개월에 염증이 치료되었으며 최종 결과는 KSS점수가 82점, UCLA점수가 33점, ASES점수가 91점, Constant점수가 71점이었다. 관절경적 회전근 개 봉합술 후 발생한 화농성 견 관절염은 관절경적 치료 및 추가적인 시술로 치료되었고, 관절 운동 범위 및 기능적 결과와 통증 및 만족도는 많이 개선되었다. Two diabetes mellitus patients treated by arthroscopy and associated procedure for an infection after arthroscopic rotator cuff repair were involved. The time interval from rotator cuff repair to symptom development was 18 days in average and arthroscopic debridement and associated procedure for infection applied in average 65 days after symptom development. Patient evaluation was done according to the KSS, ASES, UCLA and Constant Score. We used antibiotics for average 22.5 days after arthroscopic debridement and associated procedure, the infection was treated in average 4 months. At final follow-up, the mean KSS score was 82 points, the mean UCLA score was 33 points, the mean ASES score was 91 points, the mean Constant score was 71 points. All infections following arthroscopic rotator cuff repair were cured by arthroscopy and associated procedure. ROM and functional results were much improved, the pain and satisfaction were also much improved.
작업자의 작업공구에 따른 근골격계 질환과 작업효율 모델
박재현,김경훈,김재준,Park, Jae-Hyun,Kim, Kyong-Hoon,Kim, Jae-Jun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.2
Due to a massive outbreak in the workplace and a rapid increase of industrial disaster victims, musculoskeletal disorders is recently emerging as a major issue in the field of industry safety and health. Musculoskeletal disorders has already held a high rank of occupational diseases in advanced countries and it is rapidly growing every year in Korea. In particular, it is expected that people working in the construction industry have higher rates of musculoskeletal disorders given that the construction industry requires a higher level of dependence on human labor and laborers' high intensity of physical labor outside. In this regard, targeting laborers involving in building construction, this study attempts to analyze the impact of musculoskeletal disorders which can be shown according to working hand tools, making to model musculoskeletal disorders on efficiency. As a result of analyses, it appears that there are differences in body parts that hurt skeleton and musculature between structural steel laborers and carpenters owing to different working hand tools they use. In case of structural steel laborers, they tend to feel most psychological distress when their necks and shoulders are under stress. In contrast, carpenter is likely to be agitated when their legs and knees are exposed to stress. Accordingly, this study is worthwhile by finding out different levels of musculoskeletal stress and different body parts depending on the tools laborers use, in turn proving that this has an impact on efficiency through modeling and quantifying it.
박재현,김경훈,김재준,Park, Jae-Hyun,Kim, Kyong-Hoon,Kim, Jae-Jun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.2
This study aims to overcome problems of scheduling established by planner's institution and judgment. By introducing stochastic approach, this study proposes a method to predict work duration on the construction sites reflecting work information generated around unit work of previous cases and non-working day, and this model was verified by its application to a case study. As a result of analyses on previous researches in an attempt to develop work duration model, there were several studies on estimating work duration based on stochastic approach. However, previous researches could not predict work duration in different construction sites because unit work was not separated. Accordingly, this study attempts to suggest a practical method to predict work duration in advance in pre-construction phase where construction is not under way. After predicting construction time of a site where duration is supposed to be predicted based on the data of measuring case study, verification of this model was carried out in compared to real construction time. In consequence, work duration within twelve days was been estimated with a margin of error of 5%. In addition, the period for actual construction turned out ten days, which was analyzed within twelve day. Therefore, model of this study show the practical method estimating work duration in pre-construction phase.
Al<sub>2</sub>O<sub>3</sub>와 TiO<sub>2</sub>의 반응소결로 제조한 Al<sub>2</sub>TiO<sub>5</sub>-기계가공성 세라믹스
박재현,이원재,김일수,Park, Jae-Hyun,Lee, Won-Jae,Kim, Il-Soo 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
Aluminium titanate($Al_2TiO_5$) has extremely anisotropic thermal expansion properties in single crystals, and polycrystalline material spontaneously microcracks in the cooling step after sintering process. These fine intergranular cracks limit the strength of the material, but provide an effective mechanism for absorbing strain energy during thermal shock and preventing catastrophic crack propagation. Furthermore, since machinable BN-ceramics used as an insulating substrate in current micro-electronic industry are very expensive, the development of new low-cost machinable substrate ceramics are consistently required. Therefore, cheap $Al_2TiO_5$-machinable ceramics was studied for the replacement of BN ceramics. $Al_2O_3-Al_2TiO_5$ ceramic composite was fabricated via in-situ reaction sintering. $Al_2O_3$ and $TiO_2$ powders were mixed with various mol-ratio and sintered at 1400 to $1600^{\circ}C$ for 1 h. Density, hardness and strength of sintered ceramics were systematically measured. Phase analysis and microstructures were observed by XRD and SEM, respectively. Machinability of each specimens was tested by micro-hole machining. The results of research showed that the $Al_2TiO_5$-composites could be used for low-cost machinable ceramics.