푸른길 공원의 대기 환경 특성에 관한 연구

민경우,이경석,박옥현,윤관주,김도술,박세일,정원삼,이대행,조영관,Min, Kyoung-Woo,Lee, Kyoung-Soek,Park, Ok-Hyun,Yoon, Kwan-Ju,Kim, Do-Sool,Park, Se-Il,Jeung, Won-Sam,Lee, Dae-Hang,Cho, Young-Gwan 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.3

Objectives: This study aimed to survey the characteristics of air quality and meteorological conditions in a greenway park. Methods: We measured meteorological and health related factors, including noise, particulate matter ($PM_{10}$) and selected gaseous air pollutants at three locations in a greenway park and on a general roadside as comparison. The measurements were repeated four times from April to October 2014. Results: The average air temperature in the greenway park was $20.7^{\circ}C$ which was $1-2^{\circ}C$ lower than on the general roadside. The average $PM_{10}$ concentration in the greenway park was $85.0{\mu}g/m^3$, a level 2-3 times lower than that at the roadside. The noise level at the greenway site was 4.4 dB(A)- 23.0 dB(A) lower than at the roadside. The average CO, $CO_2$, $SO_2$ and NOx concentrations in the greenway park were lower than at the roadside. The average phytoncide and anions concentrations in the greenway park were higher than at the roadside. Conclusions: The urban forest of the greenway park may have some impact on air quality and meteorological conditions.

Electrical, Thermal, and Thermoelectric Transport Properties of Se-doped Polycrystalline Re2Te5

Se Woong Lee,Okmin Park,Hyun-Sik Kim,Won-Seon Seo,Sang-il Kim 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.12

Re2Te5 is considered a potential thermoelectric material because of its intrinsically low thermalconductivity, due to its complex crystal structure. Herein, a series of Se-doped Re2Te5 (Re2Te5-xSex, x = 0, 0.2,1, and 2) samples were synthesized, and their electrical and thermal transport properties were investigated. Pure orthorhombic Re2Te5 phases were successfully synthesized without any impurities for all compositions,and the continuous decrease in the calculated lattice parameters confirmed the substitution of Se atoms atthe Te sites. A maximum power factor of 0.135 mW/mK2was achieved for the sample with x = 0.2 at 880 K,mainly due to the increase in carrier concentration and electrical conductivity. The lattice thermalconductivity significantly decreased for all doped samples, which was attributed to the point defect phononscattering caused by Se doping. The thermoelectric figure of merit, zT reached a maximum value of 0.20 at880 K for Re2Te4.8Se0.2 (x = 0.2) sample, which was approximately 22% higher than that of the pristine Re2Te5sample. The weighted mobility, quality factor, and expected zT were calculated to evaluate the optimizationof the power factor and zT.

2차 샘프링 방법을 이용한 단일 채널 펄스 도플러 장치에 대한 연구

박세현,김영길,김재경 亞洲大學校 1988 論文集 Vol.11 No.-

The doppler effect is used for measuring the velocity of the bloodflow in artery. Because of the range information, the pulsed doppler system is most commonly used. In this paper, we propose a new pulsed doppler system which uses second-order sampling method in order to detect the bloodflow direction and to simplify the complex hardware. The pulsed doppler system using second order sampling method eliminates In-phase, Quadrature phase channel balancing problem at demodulator. In additon, the new pulsed doppler system shows the possiblity of simple serial processing system.

흰쥐에서 심정지후 뇌의 허혈-재관류 손상과 Tumor Necrosis Factor-α의 상관관계

최승필,박규남,박승현,박상현,정시경,김세경 대한응급의학회 1999 대한응급의학회지 Vol.10 No.4

Background : Tumor necrosis factor-α(TNF-α) has been thought to play a major role in neurological injury during global brain ischemia and subsequent reperfusion following resuscitation in cardiac arrest. So, we hypothesized that the elevation in TNF-α was dependent upon the duration of the global brain ischemia, and related to delayed neuronal damage. Methods : Fourteen rats were divided two groups ; 1 minute-cardiac arrest group(n=7) and 3 minute-cardiac arrest group(n=7). we induced cardiac arrest by chest compression and clamping of tracheal tube for 1 minute and 3 minutes respectively. And then, resuscitation was initiated. To measure the plasma activity of TNF-α, blood samples were drawn before and at the end of cardiac arrest, and 30, 60, 90, and 120 minutes after initiation reperfusion. At 72 hours after resuscitation, the ND(neurologic deficit) score was determined and the histopathologic outcome of hippocampal CA1 neuron was observed by the percent dead hippocampal CA1 neurons. Results : 1. TNF-α level during the early reperfusion period(<2h) was significantly increased in 3 min-cardiac arrest group compared with 1 min-cardiac arrest group(p=0.0001). 2. There was a no significant difference of neurologic deficit score between 1 min-and 3 min-cardiac arrest. 3. Percent dead hippocampal neurons were significantly increased in 3 min-cardiac arrest group compared with 1 min-cardiac arrest group(9.1±1.2% vs 1.2±0.9%, p<0.05). Conclusions : The results suggest that longer duration of global brain ischemia causes a more profound increase in plasma TNF-α level during the early reperfusion period(<2h) and more delayed neuronal damage than lessor duration of global brain ischemia, and that increase in TNF-α level during the early reperfusion period(<2h) is related to delayed neuronal damage.

질소 및 셀레늄 분위기 열처리가 나노 입자 Cu(In, Ga) Se₂ 광흡수층의 치밀화에 미치는 영향

김기현(Kim, Ki-Hyun),안세진(Ahn, Se-Jin),전영갑(Chun, Young-Gab),박병옥(Park, Byun-Ok),윤경훈(Yoon, Kyung-Hoon) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06

나노 입자 분무 기법을 이용한 Cu(In,;Ga)Se₂ (CIGS) 광흡수층 제조 기법은 고진공 장치를 사용하지 않는다는 점에서 대면적 저가형 CIGS 태양전지 양산에 적합한 차세대 기술로 인식되고 있다. 그러나 일반적으로 스프레이 된 상태의 CIGS충 자체는 태양전지 제조에 적합하지 않은데 이는 스프레이 막의 다공성 구조 때문이다. 본 연구에서는 나노입자 분무 기법을 이용하여 증착한 CIGS 광흡수층막을 질소 또는 셀레늄 분위기에서 열처리함으로써 태양전지 제조에 적합한 치밀한 구조의 CIGS 광흡수충을 제조하고자 하였다. 실험 결과, 질소 분위기 500?C의 온도에서 1시간 열처리하여도 CIGS 나노 입자의 성장은 거의 일어나지 않는 것으로 나타났다. 반면 셀레늄 분위기 500?C의 온도에서 30분 열처리시 입자 크기가 1{mu}m이상인 치밀한 광흡수층을 얻을 수 있었다. 본 결과는 CIGS 나노 입자의 입자 성장 반응에서 열에너지 단독에 의한 표면 에너지 감소 효과는 미미하며 셀레늄 증기의 역할이 더욱 크다는 것을 의미하는 것이다.

폐암과 동반되어 나타난 기관기관지병증 골연골형성증 1예

이영진,전현수,박시형,김모세,김현주,이승헌,이영민,이현욱,이현경 仁濟大學校 白病院 2010 仁濟醫學 Vol.31 No.-

Tracheobronchopathia osteochondroplastica (TPO) is a rare benign disease of unknown etiology characterized by multiple cartilaginous or bony submucosal nodules, which project into the tracheobronchial lumen. Although some disorders were reported combined with TPO, these seemed to be considered casual. We report a case of TPO that combined with adenocarcinoma of lung. She was 50-year-old non smoking woman presented with chronic cough with right chest pain. Lung mass on right lower lobe was found on chest x-ray, so lung cancer was suspected. Multiple scattered whitish small elevations from trachea to bronchial trees were found on bronchoscopic exam. We mistook these lesions for metastases from lung cancer and biopsies of these lesions were done. Transbronchial biopsy for right lower lobe mass lesion was also done. But biopsies from trachea and bronchus revealed TPO rather than lung cancer. Transbronchial lung biopsy of right lower lobe mass was diagnosed adenocarcinoma of lung. So TPO combined with adenocarcinoma of lung was diagnosed.

경주지역 여고생의 초경과 체성장간의 관계

김준섭,권오구,박진석,오종수,박정현,박제식,안세한,이용환,서정호,신태섭,최영배,김덕수,이관,박수경 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1

본 연구는 경주지역 1개 고등학교 3학년 여고생을 대상으로 초경 시작 전인 초등학교 4학년부터 고등학교 2학년까지의 키, 몸무게, 가슴둘레 수치와 초경 연령을 파악하여 여성의 초경이 빠를수록 체성장 속도의 변화가 있을 것이라는 가설을 기초로 두 요인간의 관련성을 파악하고자 시행되었다. 경주시 1개 여자고등학교 3학년생 총 317명에 대해 ㅊ경 나이, 초경시 심리 상태, 초경이 시작되었을 때의 상담 여부와 상담하였던 사람, 부모 신장과 초경전후의 식사 규칙성, 다이어트 경험, 수면시간, 스트레스, 음주/흡연 여부, 질병력 등에 대한 설문 조사를 시행하였고, 초등학교 4학년부터 고등학교 2학년까지의 키, 몸무게, 가슴둘레에 대한 정보는 건강기록부에서 확보하였다. 상기 대상자 중 건강기록부가 분실된 39명, 초경나이에 대해 응답하지 않았던 29명 및 결석 등으로 조사를 하지 못하였던 42명을 제외한 조사 대상자는 206명으로 선정하였다. 대상자들의 초경연령 평균값(Mean±SD)은 13.0±1.11이었고, 초등학교 4학년부터 고등학교 2학년까지의 초경 이후 신장 성장률은 감소하였으며, 초경연령이 빠른 군이 초등학교 때는 신장에 있어서 우위를 차지하나 고등학교에 오면서 신장은 비슷한 수준이 되었다. 초경후 1-2년 사이에 체중과 흉위의 증가율은 감소하였고, 초경연령이 빠른 군이 초등학교와 고등학교 사이에 체중과 흉위에서 모두 우위를 차지하였다. 본 연구의 결과는, 흔히 이차 성징의 시작 시점 혹은 사춘기의 시작 시점으로 보고있는 초경 연령이 청소년기의 성장과 밀접한 관련성이 있고, 특히 체중과 흉위의 성장 속도와 밀접한 관련성이 있음을 시사한다. To understand the onset of menarche in relation to changes in physical growth that take place during female adolescence, especially the changes in height and weight velocity. The 207 senior in one women high school of Kyongju were investigated in April 3 to 8, 2001. We collected the information, relation in the age at menarche, height & weight of parents, regularity of eating, and obesity diet, duration of sleeping, sickness & stress near age at menarche, by self-recording. The status of height, weight & chest circumference between the 4th grade of primary school and the junior of high school was collected by individual Health Record. The results were followed; The average age at menarche was 12.95±1.11 years old and the most frequent age of menarche is 13 years. After menarche, the velocity of height, weight and chest circumference were decreased. The most rapid group of menarche hold dominant position in height during elementary school. As time passed, they dont hold dominant position in height. The most rapid group of menarche get an advantage in the weight and the girth of chest after elementary school. The height of subjects is directly proportional to the height of their parents. These results suggest that the starting age at menestuation can be closely associated with physical growth and development.

디지털 랜덤 비트 동기 회로의 하드웨어 설계에 관한 연구

박세현 安東大學校 工業技術硏究所 1996 공업기술연구논문집 Vol.3 No.1

In this paper, the bit synchronization circuit which extracts synchronized clock for random NRZ signal is designed and performance is analyzed. The designed bit synchronization circuit consists of two counters, comparator and decoder. It is shown that an effective improvement in PLL function such as phase locking on low frequency is achieved. This algorithm can be adapted in the digital LSI chip used for radio pager of mobile communication system.

신문을 활용한 모의주식투자 수업 사례의 연구 분석

박세현,조준현 한국경제교육학회 2005 경제교육연구 Vol.12 No.2

소아에서 외상성 질식 증후군에 대한 임상적 고찰

박승현,최승필,나병호,황주일,나석주,전해명,김세경 大韓應急醫學會 1996 대한응급의학회지 Vol.7 No.1

Traumatic asphyxia has often been described as a rare clinical syndrome characterized by cervicofacial cyanosis and edema, multiple petechiae, and subconjunctival hemorrhage after a severe crush injury of the thorax or upper part of the abdomen. The pathogenesis of traumatic asphyxia is that after compression of the chest or upper abdomen, intrathoracic pressure increased suddenly. Blood is forced out of the right atrium through the valveless innominate and jugular veins into the head and neck. This sudden increased thoracic pressure in small venules and capillaries causes rapid dilation and minute hemorrhages producing the petechiae often seen. Treatment is supportive and should be focused on the associated injuries. The prognosis for traumatic asphyxia is very good despite the alarming initial physical appearance. If the patient survives the initial insult, the prognosis is excellent. Neurologic sequale may be permernant. We experienced five case of the traumatic asphyxia, and its clinical and pathophysiologic features are discussed. Increased awareness of this syndrome by emergency physicians will result in better reporting ad understanding of its clinical implications.