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.

802.11 Ad-Hoc 네트웍에서 Power Save Mechanism을 개선한 DAPSM 알고리즘

박재현,이장수,김성천,Park, Jae-Hyun,Lee, Jang-Su,Kim, Sung-Chun 한국정보처리학회 2007 정보처리학회논문지 C : 정보통신,정보보안 Vol.14 No.6

최근 무선 네트워킹 장치들이 등장 하면서 제한된 배터리에 의존하는 무선 호스트들의 전력 절감은 중요한 이슈 가 되었다. 특히 Ad-Hoc에서 배터리는 제한된 에너지를 제공하기 때문에 무선 호스트에 의해서 소모되어지는 에너지의 양을 감소시키기 위한 기술은 대단히 중요하다. 특히 MAC 과 라우팅 에서 전력 절감을 이루기 위한 논문들이 기존에 발표 되었다. 이 논문에서는 IEEE 802.11 표준의 DCF(Distributed Coordination Function)에서의 전력 절감 메카니즘을 향상 시킨 논문 이다. DCF를 위한 IEEE 802.11 전력 절감 메카니즘에서는 비콘 간격 이라는 시간으로 나누어지며 또한 이러한 각각의 비콘 간격이 시작될 때 각각의 노드들은 ATIM 창 동안 깨어 있어야 한다. 물론 모든 노드는 같은 시간에 깨어 있기 위해서는 동기화 되는 것이 필요하다. ATIM 창 동안 노드들은 비콘 기간 동안 깨어 있는 상태로 있을 것인지를 결정하기 위해서 control packet을 교환 한다. 이러한 ATIM 창 크기는 각각의 노드들의 전력 절감에 상당한 영향을 미친다. 따라서 이 논문은 ATIM 창 크기를 동적으로 증감시켜서 보다 에너지 효율을 발휘 하고자 하는 논문이다. Recently, wireless networking devices that depend on the limited Battery and power-saving of wireless hosts became important issue. Batteries can provide a finite amount of energy, therefore, to increase battery lifetime, it is important to design techniques to reduce energy consumption by wireless hosts. This paper improved power saying mechanism in Distributed Coordination Function(DCF) of IEEE 802.11. In the IEEE 802.11 power saving mechanism specified for DCF, time is divided into so-called beacon intervals. At the start of each beacon interval, each node in the power saving mode periodically wakes up during duration called the ATIM Window. The nodes are required to be synchronized to ensure that all nodes wake up at the same time. During the ATIM window, the nodes exchange control packets to determine whether they need to stay awake for the rest of the beacon interval. The size of the ATIM window has considerably affected power-saving. This paper can provide more power-saving than IEEE 802.11 power saving mode because ATIM window size is efficiently increased or decreased.

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.

신장의 투명세포 육종 1예

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.

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.

우리나라 국민의 정신질환으로 인한 질병부담 추정

박재현,윤석준,이희영,조희숙,이진용,은상준,박종혁,김윤,김용익,신영수,Park, Jae-Hyun,Yoon, Seok-Jun,Lee, Hee-Young,Cho, Hee-Sook,Lee, Jin-Yong,Eun, Sang-Jun,Park, Jong-Hyock,Kim, Yoon,Kim, Yong-Ik,Shin, Young-Soo 대한예방의학회 2006 예방의학회지 Vol.39 No.1

Objectives: This study estimated the burden of disease especially caused by psychiatric disorders in Korea by using DALY, a composite indicator that was recently developed by the Global Burden of Disease study group. Methods: First, 11 of the major psychiatric disorders in Korea were selected based on the ICD-10. Second, the burden of disease due to premature death was estimated by using YLLs (years of life lost due to premature death). Third, for the calculation of the YLD (years lived with disability), the following parameters were estimated in the formula: the incidence rate, the prevalence rate and the disability weight of each psychiatric disorder. Last, we estimated the DALY of the psychiatric disorders by adding the YLLs and YLDs. Results: The burden of psychiatric disorder per 100,000 people was attributed mainly to unipolar major depression (1,278 person-years), schizophrenia (638 person-years) and alcohol use disorder (287 person-years). For males, schizophrenia (596 person-years) and alcohol use disorder (491 person-years) caused the highest burden. For females, unipolar major depression (1,749 person-years) and schizophrenia (680 person-years) cause the highest burden. As analyzed by gender and age group, alcohol use disorder causes a higher burden than schizophrenia in men aged 40 years and older. For females, unipolar major depression causes the highest burden in all age groups. Conclusions: We found that each of the psychiatric disorders that cause the highest burden is different according to gender and age group. This study's results can provide a rational basis to plan a national health policy regarding the burden of disease caused by psychiatric disorders.

전형적(典型的)인 학질의 증례(證例) 보고(報告)

박재현,Park, Jae-Hyun 대한한방내과학회 1998 大韓韓方內科學會誌 Vol.19 No.2

This study was performed on the bases of clinical consideration about patient who has malaria. The symptoms of malaria are periodic alternating of chills and fever on everyone, two or three days. The patients feel a chill at the first time of malaria, and have a fever, headache and sweating at the next time. The long cycle of malarial fever such as every 2 or 3 days means that it takes a turn for the worse. In this study, oriental medicine was taken based on the oriental medicine principle such as Dalwonum(達原飮), Sosihotang(小柴胡湯) and Bojungikgitang(補中益氣湯), and the patients take a turn for the better. In the process of treatment if there is no fever in the expected date of the malarial fever, it is sure to have fever in the next expected date. It is favorable that patients lose the chills first and the fever lately in the process of treatment, and we can explain that supporting healthy energy to eliminate evil(扶正祛邪). The long cycle of malarial fever such as every 4, 6 or 9 days means that it is just before the recovery.

선천성 간 섬유증을 동반한 Kabuki 증후군 1예

박재현,정명화,이희정,이지현,최연호,송상용,서연림,황진복,Park, Jae-Hyun,Chung, Myung-Hwa,Lee, Hee-Jung,Lee, Jee-Hyun,Choe, Yon-Ho,Song, Sang-Yong,Suh, Yeon-Lim,Hwang, Jin-Bok 대한소아소화기영양학회 2008 Pediatric gastroenterology, hepatology & nutrition Vol.11 No.1

저자들은 어린 영아기에 선천성 간섬유증으로 진단받은 후 특징적인 얼굴 모습과 함께 발달 및 지능 저하를 보이는 10세 남아에서 가부키 증후군으로 진단된 1예를 경험하였기에 문헌고찰과 보고하는 바이다. Kabuki syndrome is characterized by peculiar facial features, developmental delay, and mental retardation. Congenital hepatic abnormalities in Kabuki syndrome patients have been sporadically reported in the literature and consist of extrahepatic biliary atresia, neonatal sclerosing cholangitis, and transient neonatal cholestasis. We report here a case of congenital hepatic fibrosis in a patient with Kabuki syndrome. To our knowledge, only one case of congenital hepatic fibrosis has been reported in the setting of Kabuki syndrome.

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.

기후정보를 반영한 확률적 일정계획수립 모델 개발

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.