북한산국립공원의 계류수질 보전 전략(I)

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)

백운산 지역에서 계류수의 이화학적 성질에 미치는 양어장의 영향(II)

박재현,우보명,김우룡,안현철,Park, Jae-Hyeon,Woo, Bo-Myeong,Kim, Oue-Ryong,Ahn, Hyun-Chul 한국환경복원기술학회 2001 한국환경복원기술학회지 Vol.4 No.1

Quantifications of fish farm influences on stream water quality may provide basic informations on watershed management to reduce environmental impact due to fish farm development and to conserve stream water quality in forested watershed area. In this research stream water qualities around Mt. Paekun area were monitored seasonally and the following results were obtained. Due to the increase of pH in effluent water from the fish farm it was believed that alkalization of stream water can be accelerated by large scale development of fish farms in the forested watershed area. Negative effects on stream water quality were observed by indications of increase in electrical conductivity and temperature of effluent water from the fish farm. Decreases in physicochemical indices such as the amount of dissolved oxygen, percentage of dissolved oxygen, total amount of cation, total amount of anion and total amount of ion in effluent water from the fish farm were also negative aspects in downstream ecology. It is recommended that water purification system as well as eco-friendly fish farm design should be incorporated to large scale fish farm development plan in forested watershed area.

갑상선 주위 종양으로 표현된 식도 신경초종 1예

박재현,김충배,전혜민,강상욱,정종주,이용상,남기현,장항석,정웅윤,박정수,Jae Hyun Park,Choong Bai Kim,Hyae Min Jeon,<SUP>1<,SUP>,Sang-Wook Kang,Jong Ju Jeong,Yong Sang Lee,Kee-Hyun Nam,Hang Seok Chang,Woong Youn Chung,and Cheong Soo 대한갑상선-내분비외과학회 2011 The Koreran journal of Endocrine Surgery Vol.11 No.1

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.

Al₂O₃와 TiO₂의 반응소결로 제조한 Al₂TiO₅-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.

TNT 처리에 관한 연구동향

박재현,신원모,이재우,Park, Jae Hyun,Shin, Won Mo,Lee, Jae W. 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.1

Over the decades, TNT has been produced indiscriminately to be utilized in many fields owing to its ability to manipulate the explosion. Yet, the proper technique for disposal of TNT and the waste residues had not been developed so that the large amount of TNT waste was being piled up. Upon the agreement to demilitarization of old weapon, a study on the disposal methods for TNT and the waste treatment have been raised for their dangerous nature. Since then, from burying in landfill to utilizing supercritical fluid-based oxidation, a lot of research is actively ongoing, but little progress has been made in Korea compared to developed countries. This review paper covers all the technologies developed for TNT and its waste disposal including the concept, advantage, and disadvantage of those technologies. Also, suggested here are the future research directions.

홍수시 얕은기초의 세굴위험도 평가 사례연구

박재현,이주형,정문경,곽기석,Park. Jae-Hyun,Lee. Ju-Hyung,Chung. Moon-Kyung,Kwak. Ki-Seok 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1

Scour vulnerability evaluation for shallow foundations was performed to assure bridge safety against scour in the national capital region. The case studies for 26 shallow foundations consisted of site investigation including boring test, bridge scour analysis for the design flood, bearing capacity evaluation of the bridge foundation before and after scour, and comprehensive evaluation of bridge scour vulnerability. Bridge scour vulnerability was determined based on the interdisciplinary concept considering predicted scour depth for the design floods and bearing capacity of foundation as well as dimensions of foundation. Nine of 26 shallow foundations showed the potential future vulnerability to scour with significant decrease in the bearing capacity of foundations due to scour and the remaining 17 were expected to maintain their stability against scour.

최적화된 Hough 변환에 근거한 효율적인 차선 인식

박재현,이학만,조재현,차의영,Park Jae-Hyeon,Lee Hack-Man,Cho Jae-Hyun,Cha Eui-Young 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.2

본 논문에서는 차선 추출을 위해서 OHT(Optimized Hough Transform) 알고리듬을 제안한다. 입력 영상을 그레이 영상으로 변환하고 변환된 그레이 영상은 수평 투영을 통해 주변 배경 영역과 도로 영역으로 분리된다. 분리된 도로 영역에서 OHT(Optimized Hough Transform) 알고리듬을 적용한다. OHT(Optimized Hough Transform) 알고리듬은 다음과 같이 특징지어진다. 첫째, 윤곽선 방향각을 이용해서 차선후보 픽셀을 최소화하였으며, 둘째, 좌우 차선의 범위는 제한된 ${\theta}$값으로서 정의하였다. 실험 결과, 제안한 알고리듬이 기존의 Hough Transform보다 훨씬 효율적임을 알 수 있었다. In this paper, we propose OHT(optimized nough Transform) algorithm for the lane extraction. Input image is changed into 256 gray revel image. Gray level image is separated into background region and road region by using limited horizontal projection value. In separated road area, we apply OHT algorithm. OHT algorithm is characterized as follows. First, the number of candidate pixels is reduced using the outline orientation of the lane. Second, each range of the left and right lane is defined by limited ${\theta}$ Experimental results show that the proposed method is better than Hough Transform.

회전근 개 파열의 수술적 치료시 초음파 연속 검사의 유용성

박재현,최원기,최창혁,Park, Jae-Hyun,Choi, Won-Ki,Choi, Chang-Hyuk 대한정형외과초음파학회 2008 대한정형외과 초음파학회지 Vol.1 No.2

목적: 회전근 개 파열 환자에서 수술 전의 자기 공명 영상 검사와 초음파 검사에 따른 관절경 소견을 비교하고, 수술 후 2주, 6주 및 3개월의 회전근 개의 건재 상태를 초음파로 확인하는데 있다. 대상 및 방법: 2008년 2월부터 5월까지 본원 정형외과에 내원하여 회전근 개 파열로 관절경적 치료를 시행한 환자 29명을 대상으로 초음파 검사와 자기 공명 영상 검사를 시행한 후 관절경적 시술을 이용하여 비교하였으며, 수술 후 2주, 6주 및 3 개월에 회전근 개의 건재 상태를 초음파를 이용하여 관찰하였다. 결과: 회전근 개 파열을 확인할 수 있는 초음파 검사와 자기 공명 영상 검사의 예민도는 각각 100%였다. 전층 회전근 개 파열에서 초음파 검사와 자기 공명 영상 검사의 예민도는 각각 95%, 82%였으며, 부분층 회전근 개 파열에서 초음파 검사는 50%, 자기 공명 영상 검사는 33%의 예민도를 나타내었다. 전체 환자에 대한 초음파 검사의 정확도는 86%, 자기 공명 영상 검사의 정확도는 69%이었다. 전층 회전근 개 파열로 복원술을 시행한 22예 중 수술 후 2주에 시행한 추시 관찰 초음파 검사상 11예(50%, 소 및 중 파열 2예, 대 및 광범위 파열 9예)에서 회전근 개의 봉합 부위에서 수술 소견과 일치하는 틈새로 진단되는 저에코를 확인할 수 있었으며, 수동적 신장 운동을 시행한 후 수술 6주의 추시 관찰 초음파 검사상 5예(23%, 소 및 중 파열 1예, 대 및 광범위 파열 4예)에서 재파열 소견을, 능동적 운동을 시행한 후 수술 3개월의 추시 관찰 초음파 검사상 7예(32%, 소 및 중파열 2예, 대 및 광범위 파열 5예)에서 재파열 소견을 보였다. 결론: 회전근 개 파열에 대한 관절경적 치료 후 초음파 연속 검사는 술 후 틈새와 술 후 재파열을 구분하는데 도움을 줄 수 있었으며, 수술 후 6주에 23%, 3개월에 32%의 재파열 소견을 보인 바 재활 치료시 추가 치료의 방침을 세우는데 도움을 줄 수 있을 것으로 생각되었다. Purpose: The findings of preoperative magnetic resonance imaging (MRI) and ultrasonography (US) examination in the diagnosis of rotator cuff tear were then compared with the findings of arthroscopic examination, and to evaluate the postoperative integrity of rotator cuff using serial US examination. Methods: Between February and May 2008, 29 patients with rotator cuff tear had undergone preoperative US and MRI examination and subsequent arthroscopic examination. And the results of MRI and US were compared with intra-operative results of the arthroscopic examination. We observed the postoperative integrity of rotator cuff using serial (postoperative 2 weeks, 6 weeks, 3 months) US examination. Results: The sensitivity of US and MRI for identifying rotator cuff tear were 100% and 100%. The sensitivity of US and MRI were 95% and 82% in full thickness tear, and 50%, 33% in partial thickness tear, respectively. Overall accuracy of US and MRI were 86%, 69%. Among 22 patients were operated for full thickness tear, intra-operative gap formation was identified in 11 patients (50%, small to medium 2 cases, large to massive 9 cases) which were identified at 2 weeks postoperative US. We could find 5 re-tears (23%, small to medium 1 case, large to massive 4 cases) on 6 weeks postoperative US after passive range of motion (ROM) exercise, and could also find 7 re-tears (32%, small to medium 2 cases, large to massive 5 cases)on 3 months postoperative US after active ROM exercise. Conclusion: Serial US after arthroscopic rotator cuff repair was useful to differentiate intra-operative gap formation from postoperative re-tear. We found 5 retears (23%) at 6 weeks and 7 retears (32%) at 3 months postoperative US, it was useful to make treatment plan during postoperative rehabilitation.