제주도 연안 초망 어선의 소음에 관한 연구

박성욱,서익조,오승훈,김병엽,이창헌,서두옥 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-

제주도 연안에서 이루어지는 초망 어업에서 수중음을 이용하여 멸치 어군을 유효하게 집어하기 위한 기초 자료를 얻기 위하여 어선의 주기관을 공회전시켰을 때의 선상과 어군이 유집되어 투망되는 수심 4m지점과 함께 수심 10m층의 수중 소음을 측정 조사하였다. 이때 사용한 선박의 공회전은 전진시의 800 rpm과 후진시의 1000 rpm으로 그 결과는 다음과 같다. 1. 기관의 회전수 800 rpm에서 선수(B), 갑판(D), 선미(S), 연돌 위(F), 기관실 내(E)의 소음 준위는 각각 90, 93, 106, 107, 101 dB 이었으며, 기관 회전수 1,000 rpm에서의 소음 준위는 각각 93, 95, 110, 109, 103dB이었다. 2. 회전수를 800rpm으로 할 경우 100, 300, 500, 1000, 1500, 2000 Hz에서 선수의 소음 준위는 4m인 경우 각각 92, 95, 102, 97, 94, 92dB 이었으며, 수심 10m인 경우 87, 88, 99, 96, 94, 93 dB이었고, 선체 중앙에서는 4m인 경우 94, 91, 100, 96, 94, 92dB, 10m인 경우 93, 92, 99, 95, 93, 91dB이었다. 선미에서는 4m인 경우 98, 94, 100, 97, 94, 92 dB이었으며 10 m인 경우 92, 93, 99, 96, 93, 92 dB로 나타났다. 3. 후진시 사용하는 회전수 1000 rpm으로 할 경우 100, 300, 500, 1000, 1500, 2000 Hz에서 선수 소음 준위는 4m인 경우 각각 86, 91, 98, 95, 93, 92 dB로 나타났고, 10m인 경우 88, 87, 99, 96, 94, 92 dB로 나타났으며, 선미에서는 4m인 경우 88, 88, 99, 96, 93, 92 dB, 10m인 경우 88, 86, 99, 96, 94, 92 dB로 나타났다. In order to obtain a basic data for alluring a school of fish, anchovy with emitting underwater sound, an experimnet for measuring noise level was carried out on no-load operation of a engine. noise level was measured at the depths of four meters and ten meters and analyzed. Then, the revolution per minute of the ship used at this field experiment was 800 including 1000. The results were followed. 1. On 800 rpm, noise levels on board were 90, 93, 106, 107 and 101 dB in the order of bow, deck, stern, funnel, funnel and engine room. In addition, 93, 95, 110, 109 and 103 dB on 1000 rpm, respectively. 2. on 800 rpm, underwater noise levels of the depth of four meters at the bow were 92, 95, 102, 97, 94 and 92dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 87, 88, 99, 96, 94 and 93 dB. Underwater noise levels of the depth of four meters outside the engine room were 94, 91, 100, 96, 94 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 93, 92, 99, 95, 93 and 91 dB. Underwater noise levels of the depth of four meters at the stern were 98, 94, 100, 97, 94 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500, and 2000 Hz, respectively and those of the depth of ten meters were 92, 93, 99, 96, 93 and 92 dB. 3. On 1000 rpm, underwater noise levels of the depth of four meters at the bow were 86, 91, 98, 95, 93 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 88, 87, 99, 96, 94 and 92 dB. Underwater noise levels of the depth of four meters at the stern were 88, 88, 99, 96, 93 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 88, 86, 99, 96, 94 and 92 dB.

광센서를 이용한 점핑링의 위치검출과 교육용 시스템 제작

박성욱 한국센서학회 2002 센서학회지 Vol.11 No.6

교류 220V에 의해 동작하는 점핑링 장치를 제작하고 광센서를 사용하여 링의 높이정보를 받아 부상한 링의 높이를 실시간으로 검출하고 교육적 효과를 높이기 위해 디지털 높이정보를 아날로그 변환하여 쉽게 높이를 알 수 있도록 하였다. 교육용 시스템을 직접 제작하여 시스템을 모형화하여 제어신호를 구하고 제어 프로그램에 의해 원하는 높이로 링을 부상할 수 있도록 하였다. 본 논문은 광센서를 사용하여 링의 위치를 실시간으로 검출하였고 광센서의 배열과 높이 정보를 발광다이오드 5개로 디지털 값을 보여주었고, D/A 변환하여 교육용 시스템을 제작하여 A/D 변환기를 통해 데이터 신호처리하였다. 교육용 시스템응 모형화하여 원하는 링의 높이를 실시간으로 제어 할 수 있게 하였다. The jumping ring apparatus described in this study is used to demonstrate and educate the effects of electromagnetic induction. Placing an aluminum ring over the core and switching on AC source causes the ring to jump in the air due to induced currents in the ring producing a magnetic field opposed to that produced in the core. This force is a function of flux density, ac current of ring and leviated height of the ring. Using photo sensor arrays, detect the ring position and represent the position of the ring to analog voltage for an education performance. This paper presents modelling of the jumping ring system and shows how does control signal generate in order to follow desired position.

盛土에 의한 橋臺의 側方移動에 대한 硏究

박춘식,장정욱,유기재,최성민 國立 昌原大學校 産業技術硏究所 2002 産技硏論文集 Vol.16 No.-

This Study investigated a possibility of lateral movement in the reconstruction field of Nongso bridge at Nongso-ri, Joochon-myeon, Kimhae. The methods applied in this study were the judgement formula and the Finite Element Method(FEM). The conclusions are shown in the following. 1) The application of the FEM, as well as the judgement formula resulted in the lateral movement. 2) Bridge abutment and foundation must be constructed after completing consolidation. 3) The occurrence possibility of lateral movement should be judged by the FEM that can re-present field conditions. 4) Lateral movement will take place in the case. Hence, settlement of proper countermeasure method should be followed by the construction.

간 이식 환자에서 발생한 파종성 Scedosporium apiospermum 감염 1예

박현구,최성호,강호석,송주형,정지훈,소민욱,최상호,김양수,우준희 대한감염학회 2006 감염과 화학요법 Vol.38 No.5

저자들은 다발성 뇌 농양을 동반한 치명적인 파종성 S. apiospermum 감염이 발생한 간 이식 환자를 경험하였다. 본 증례의 환자는 voriconazole로 치료하는 호전경과를 보이다가 진균성 뇌 동맥류 파열로 사망하였다. S. apio-spermum은 비교적 드문 진균으로 병리학적으로 Aspergillus spp.와 매우 유사하고 amphotericin B에 내성을 나타내므로 진단과 치료가 적절하게 이루어지지 못할 가능성이 많고 면역 기능 저하 환자에서 혈행성 전파를 통한 파종성 감염이 용이하게 발생하므로 높은 사망률을 나타낸다. 이식 환자를 비롯한 면역 기능 저하 환자에서 진균감염이 의심될 때 S. apiospermum과 같은 드문 진균에 의한 감염증도 감별진단에 포함해야 하겠다. Sedosporium apiospermum is a saprophytic fungus commonly found in soil and polluted water. This organism is known as a cause of mycetoma, which may occur in immunocompetent hosts following trauma. However, in immunocompromised patients, S. apiospermum can also cause life-threatening invasive disease, including central nervous system infection or disseminated infection. We report a fatal case of disseminated S. apiospermum infection in a 46-year-old woman after liver transplantation. Eight days postoperatively, she developed pneumonia, followed by altered mentality in the 15 days. A head CT demonstrated multiple brain abscesses. Sputum and stereotactic-aspirated brain abscess culture yielded S. apiospermum. Despite treatment with voriconazole, the patient died of intracranial hemorrhage.

원광 뇌졸중 등록 자료를 통한 허혈성 뇌졸중의 임상 양상과 위험인자

박현영,장혁,박성욱,김요식,조광호 圓光大學校 醫科學硏究所 1999 圓光醫科學 Vol.15 No.2

Background: To investigate clinical features and risk factors of stroke patients who lived in Korean rural area, we analysis Wonkwang Stroke Registry and compared with other studies. Methods: We filled out Stroke Registry in the consecutive patients with acute ischemic stroke from march 1997 to February 1999. We analyzed demographic data, risk factors and subtypes of stroke. All patients were divied into 3 groups according to their age. Stroke subtype was classified into large artery atherosclerosis(LAA),small vessel occlusion(SVO), cardioembolism(CE), stroke of other determined etiology(SOE), and stroke of undetermined etiology(SUE) by TOAST(Trial of Org 10172 in Actue Stroke Treatment). Results: Five hundred nine patients were included in Wonkwang Stroke Registry from march 1997 to February 1999. Mean age was 65.47±0.48 years old. The ratio of males to females was 1 : 0.78. SVO was the most frequent subtype(49%) of ischemic stroke, and then followed by LAA(27.5%), CE(7%), SOE(8.1%), and SUE(8.4%). The internal carotid artery(ICA) territory was involved in 59.3% patients. Vertebrobasilar artery territory involvement was noted in 37.5%, and 3.2% of patients showed multiple artery territory involvement. All patients had risk factor of ischemic stroke except for 14 patients. Mean number of risk factors was 1.7/patient. Hypertension(62.1%) was the most frequent risk factor, and follwed by smoking(26.3%), diabetes mellitus(25.9%), and hyperlipidemia(25.55%). Conclusions: These results showed that the proportion of ischemic stroke subtype was not concordant with other studies. It may be caused by different mode of living and ethnic difference. This study may afford further information on the characteristics of Korean rural area stroke.

작업장 특성에 따른 톨루엔 노출 근로자의 마뇨산 배출 특성

박흥재,김형준,정성욱,이병호 한국환경과학회 2005 한국환경과학회지 Vol.14 No.2

This study was carried out to investigate the correlation between toluene in air and hippuric acid in human urine, which is based in the results of the health check-in and measure of working environment, was investigated for five years. Toluene in air and hippuric acid in urine were checked 116 workers who exposed to toluene in five type of industry. The Mean concentration of toluene in air by type of industry and every year and sex distinction, had positive correlation.(p<0.01) The Mean concentration of hippuric acid in urine by type of industry, every year, sex distinction, disparity of age and term of duty had positive correlation.(p<0.01)

스테이지 이동 반력에 의한 베이스 진동 저감기법 개발

박아영,김형기,권오영,홍성욱 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

A variety of precise stages are adopted for precise machinery. To secure vibration isolation, those precise stages are mounted on a heavy base structure supported by compliant springs. Then the base structure is often subjected to vibration due to the reaction force induced by the stage motion. This paper investigates the dynamic behavior of base structures as well as a vibration reduction technique. A 6 DOF dynamic model is established to investigate the vibration of positioning stage and base structure. A new input shaper is devised to eliminate both the residual vibrations in base structure. Simulations show that the proposed input shaper effectively remove the residual vibrations in base structure.

고혈압과 당뇨병이 허혈성 뇌혈관질환의 위험인지로서의 Lipoprotein(a)에 미치는 영향

박정욱,박성경,이정욱,김영인,김용재,이광수,김범생 대한신경과학회 1996 대한신경과학회지 Vol.14 No.1

관상동맥내 방사선 근접조사 치료의 현황과 전망

박성욱 대한내과학회 2002 대한내과학회지 Vol.63 No.5

잔류진동 억제를 위한 가상모드 입력성형기 개선

박상원,최훈석,홍성욱 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

Input shaping is an efficient tool to eliminate residual vibration caused by motion of mechanical systems. However, the presence of input shapers may increase the rise time of system. This paper is concerned with the rise time reduction when using input shaping. To this end, this paper proposes an input shaper design method for an undamped single mode vibration system using virtual modes, which are not actual mode but reflected in the design process. This paper proposes a new input shaper which has multiple impulses as if a single mode system has more than one modes: one actual mode and several virtual modes. The natural frequencies of the virtual modes are design parameters to change the rise time of the system. This paper discusses the characteristics of the 1 virtual mode and 2 virtual mode input shapers. The performance of the proposed input shapers is tested by experiments.