구강외과 환자의 합병증과 예방법

강정훈 단국대학교 치과대학 예방치과 1990 예방치과 세미나집 Vol.4 No.-

초지 경영 기타 ; 웅성불임을 이용하여 육성된 수수 - 수단그라스 교잡종들에게 예취빈도가 제형질 발현과 생초수량에 미치는 영향

강정훈,김성헌,한흥전 한국동물자원과학회 ( 구 한국축산학회 ) 1991 한국동물자원과학회 심포지움자료집 Vol.- No.-

조피볼락(Sebastes schlegelii)의 혈액성상, 혈장성분 및 항산화 반응에 미치는 미세플라스틱의 독성 영향

강정훈,고지연,유영빈,최재호,이주형,강주찬 한국수산과학회 2024 한국수산과학회지 Vol.57 No.3

This study aimed to evaluate the effects of polyethylene microplastic (PE-MPs) via measuring the growth performance, hematological parameters, and antioxidant responses in Korean rockfish Sebastes schlegelii exposed to waterborne polyethylene microplastic with dimensions of 22–71 μm. S. schlegelii (mean weight, 34.55±5.82 g; mean length, 12.59±0.79 cm) were exposed to PE-MPs at concentrations of 0, 400, 800, 1,600 and 3,200 μg/L for 10 and 20 days. PE-MPs significantly affected growth performance, hematological parameters, plasma components, and antioxidant responses in a concentration-dependent manner. At a concentration ≥1,600 μg/L, PE-MPs significantly decreased body weight gain and specific growth rate, and significantly increased the hepatosomatic index. Hematological parameters showed a significant decrease in total red blood cell count and hemoglobin levels. Plasma components showed a significant increase in glucose, aspartate aminotransferase, and alanine transaminase levels, whereas total protein, calcium, and magnesium levels significantly decreased. Exposure to ≥1,600 μg/L PE-MPs also induced reactive oxygen species generation in the gill and liver, significantly increasing superoxide dismutase and catalase activity. These findings suggest that exposure to ≥1,600 μg/L PE-MPs could significantly change growth performance, hematological parameters, plasma components, and antioxidant responses, resulting in physiological toxicity.

건물 에너지 모니터링 성능 향상을 위한 기계학습 기반 IoT 측정 시스템 기술

강정훈 대한설비공학회 2019 설비저널 Vol.48 No.9

해수에 잠긴 인공기질 표면에 먼저 부착된 박테리아가 규조류의 부착에 미치는 영향

강정훈,조병철,심재형,최중기,Kang, Jung-Hoon,Cho, Byung-Cheol,Shim, Jae-Hyung,Choi, Joong-Ki 한국해양학회 1998 바다 Vol.3 No.4

Controversial observations on the effect of pre-attached bacteria on the attachment of diatoms to artificial surfaces immersed in seawater have been made. Furthermore, it is not known whether or not pre-attached bacteria on artificial surfaces influence attachment of diatoms in natural seawater. In this study, we used various surfaces to which marine bacteria were pre-attached for different incubation periods. In the first experiment, glass slides were initially attached by marine natural bacteria with different exposure time (0-133 hr) and then immersed into seawater for a certain time period. The attachment of diatoms was not affected by the abundance of pre-attached bacteria (p > 0.05). The maximum abundance of attached diatoms was found on control surfaces, and the minimum abundance on surfaces where attached bacterial abundance was highest. In the second experiment, glass slides and acryl slides, either attached by marine natural bacteria for 6 days or coated by agar, were immersed in seawater. Untreated slides were also employed. On the surfaces of acryl slides with the most abundant attached bacteria ($5.4{\pm}0.02{\times}10^5\;cells\;cm^{-2}$), abundances of attached diatoms were less than those on untreated slides. On the surfaces of glass slides with bacterial abundance of $2.5{\pm}1.0{\times}10^5\;cells\;cm^{-2}$, however, abundances of attached diatoms were not different from those of untreated slides. On the agar-coated slides, the immigration rate and immigration coefficient were on average > 2 folds compared to other surfaces, indicating high rates of diatom attachment on mucilage simulated surfaces. Therefore, it seems that pre-attachment of bacteria is not prerequisite for the attachment of diatoms on artificial surfaces.

대화형 TV 서비스 기술 및 전망

강정훈 한국통신학회 1994 정보와 통신 Vol.11 No.10

최근에 정보 고속도로 사업계획과 관련하여 세계 여러나라들이 실시하거나 실시 예정인 VOD 시험서비스에 많은 관심이 일고 있다. VOD서비스와 같은 대화형 TV 서비스(I-TV, Interactive-TV Service)는 컴퓨터, 통신 가전업체 그리고 영화 제작사등이 함께 참여하고 있다. 본 기고에서는 차세대 통합 멀티미디어 사업이라는 대화형 TV서비스의 개요와 요소기술, 그리고 서비스의 동향 및 전망을 알아보기로 한다. 1. 대화형 TV 서비스(Interactive TV Service)의 개요 현재까지 대부분의 TV 시청자들은 방송국으로부터 송신되는 공중파나 CATV서비스를 통해 프로그램 서비스를 받아보는 방송(broadcasting)방식 형태의 서비스를 이용해 왔다. 그러나 이러한 일방적인 수신방식은 최근 미국의 클린턴 행정부가 미국의 차세대 기반 통신망 구축 정책(정보 고속도로 사업; Information Super High-way)의 일환으로, CATV 사업자뿐만 아니라 지역 전화회사까지도 참여하고 있는 VOD(Video On Demand) 시험서비스가 시행됨에 따라서 미국은 물론, 우리나라를 비롯한 여러나라에서 대화형식의 TV서비스를 시행하려는 움직임이 일어나고 있다. 이러한 움직임은 지난 ‘92년 7월 16일 미 연방통신위원회(FCC. Federal Communication Committee)가 그동안 전화회사에 대해 CATV 시업진출을 금지하였던 정책을 바꿔서, CATV에 대항한 경쟁도입과 기반 정보통신망 정비를 목표로 하여 비디오 다이얼톤(VDT(주), Video Dial Tone)이라는 이름하에 공중통신 사업자에게도 영상신호를 전송을 인가함에 따라 시작되었다. VOD서비스와 같은 대화형 TV서비스는 가입자가 원하는 서비스를 시간에 관계없이 댁내의 통신회선(일반전화망, 케이블망, 광화이버망, 위성망)을 통해서 요구 즉시 실시간에 서비스를 받아볼 수 있는 멀키미디어의 통합서비스 방식이다. 도한 이 서비스는 음성통신과 방송의 통합형 서비스로서, 방송국, 전화회사 혹은 서비스 제공업자(ISP ; Information Service Provider)에 의해 제공된 디지탈 영상 및 일반 데이터 등을 압축하여 서버에 저장한 후, 소비자의 요청이 있을 경우에 통신회선을 통해 즉시 서비스 해준다. 이와 같은 대화형 TV 서비스의 구성요소로는 다양한 영상정보 및 데이타를 보유하고 있는 정보제공자, 전화선이나 CATV 또는 위성방송과 연결해 주는 지역별 비디오 서버 및 교환장치, 통신회선을 통해 전송된 서비스를 영상정보로 만들어주고 또한 가입자의 요구를 즉시 정보제공자에게 알려줄 수 있는 가정용 단말기 (STB. Set Top Box)로 이루어진다. 여기서, 비디오 서버는 다양한 대화형 TV 서비스를 제공해 주는 중계자로서, 영화, 홈쇼핑, 홈뱅킹, 대화형 교육, 비디오 게임 등을 가정에서도 가능하게 해 줄 뿐 아니라, 가입자를 관리하는 기능을 가지고 있어서 가입자 정보는 물론, 각종 서비스 사용료, 개인 통계자료 분석 등도 집계할 수 있는 기능을 가지고 있다.(그림1) 본 기고에서는 이러한 대화형 TV서비스 중에 대표적 응용서비스인 VOD 서비스에 사용되는 기술요소와 각국에서 진행되고 있는 VOD 서비스 동향 및 전망에 대해 알아보고자 한다. (주) VDT(Video Dial Tone) : FCC가 ‘92년 7월 16일에 인가한 지역 전화회사에 의한 가정용 영상 전송서비스 및 CATV에 대항한 경쟁도입과 Infrastructure의 정비를 목표로 하여 결정한 내용은 다음과 같다. 지역 전화회사에 대하여 (1) 공중통신사업자에 대하여 서비스 제공자에 대한 영상신호의 전송을 인가(기본서비스), (2) Video Gateway 서비스

전완부 동정맥루 수술 환자에서의 복합부위통증증후군과 정맥압 증가

강정훈,김권영,최대우,이민홍,장재혁 대한근전도전기진단의학회 2011 대한근전도 전기진단의학회지 Vol.13 No.2

Complex regional pain syndrome is a neuropathic pain disorder, which causes pain, edema, limited range of motion, skin temperature variation, and skin color variation in the affected part. In this paper, experimental findings of complex regional pain syndrome in a patient, who had an arteriovenous shunt operation on his forearm in the past, are discussed. The patient’s illness was diagnosed through physical examination, thermographic inspection, and three-phase bone scintigraphy. He had symptoms of vasodilation in his brachium and forearm. Also, diffuse uptake condition in his affected area was observed in a delayed image, perfusion phase and hepatic blood pool images through three-phase bone scintigraphy. Moreover, body temperature of his hand and forearm on the affected side rose by 3.02~5.57˚. Nevertheless, the cause is unknown in 10~23% of complex regional pain syndrome. Therefore, all possible cases of complex regional pain syndrome cannot be completely ruled out, and it should be treated early by performing thorough history taking, radio-graphic inspection, three-phase bone scintigraphy, thermographic inspection, and electromyography as well as active physical examination.

The Superficial Radial Nerve Injury Following Chronic Exertional Compartment Syndrome of the Forearm in a Professional Bodybuilder - A Case Report -

강정훈,김권영,한용 대한근전도전기진단의학회 2015 대한근전도 전기진단의학회지 Vol.17 No.1

Exertional compartment syndrome is an activity-related condition, often affecting young active persons. Clinical signs include the musculature pain that worsens with activity. The pathophysiology is somewhat unclear, but a temporary relative limb ischemia appears to be involved. The limb ischemia induces swelling and results in increased intracompartmental pressure. In general, chronic exertional compartment syndrome cases are diagnosed mostly in lower legs, and rarely in upper arms. So it is reported that the authors experienced a case of the superficial radial nerve injury following chronic exertional compartment syndrome of the forearm in a professional bodybuilder.

가속도계를 이용한 광전용적맥파의 동잡음 제거

강정훈,조백환,이종실,지영준,김인영,김선일,Kang, Joung-Hoon,Cho, Baek-Hwan,Lee, Jong-Shill,Chee, Young-Joon,Kim, In-Young,Kim, Sun-I. 대한의용생체공학회 2007 의공학회지 Vol.28 No.3

With the convergence of ubiquitous networking and medical technologies, ubiquitous healthcare(U-Healthcare) service has come in our life, which enables a patient to receive medical services at anytime and anywhere. In the u-Healthcare environment, intelligent real-time biosignal aquisition/analysis techniques are inevitable. In this study, we propose a motion artifact cancelation method in portable photoplethysmography(PPG) signal aquisition using an accelerometer and an adaptive filter. A preliminary experiment represented that the component of the pedestrian motion artifact can be found under 5Hz in the spectral analysis. Therefore, we collected PPG signals under both simulated conditions with a motor that generates circular motion with uniform velocity (from 1 to 5Hz) and a real walking condition. We then reduced the motion artifact using a recursive least square adaptive filter which takes the accelerometer output as a noise reference. The results showed that the adaptive filter can remove the motion artifact effectively and recover peak points in PPG signals, which represents our method can be useful to detect heart rate in real walking condition.

잠재적 위해종인 야광충의 항만 분포 특성과 수용능력

강정훈 한국해양과학기술원 2010 Ocean and Polar Research Vol.32 No.4

Ongoing port baseline surveys are essential for developing ballast water management procedures in order to control unwanted or potentially risky species. Seasonal distributional patterns of marine dinoflagellate Noctiluca scintillans internationally recognized as harmful species and the related environmental factors were surveyed at Incheon, Gwangyang and Ulsan seaports in Korea from 2007 to 2009. The above three seaports were chosen because of their status as the busiest in Korea and characterized by their different bioregions. Average temperature ranged from 2.08℃ in winter to 26.39℃ in summer at Incheon, 7.22℃ in winter to 25.77℃ in summer at Gwangyang, and 11.59℃ in winter to 21.67℃ in summer at Ulsan during the study period. Average salinity varied from 26.88 in winter to 31.25 in summer at Incheon, 22.83 in winter to 33.41 in summer at Gwangyang, and 30.04 in winter to 33.90 in summer at Ulsan. Noctiluca scintillans appeared consistently at all ports during the study period, indicating its eurythermal and euryhaline nature. The highest abundances (21,813 to 41,753 inds·m−3) of N. scintillans were observed in May 2008 and 2009 at the outer stations of Incheon port. Abundances of between 10,000 and 30,000 inds·m−3 were only observed at the innermost station of Ulsan in May, while abundances of between 10,000 and 40,000 inds·m−3 were frequently observed throughout all stations at Gwangyang during the study period, coinciding with consistently high concentration of chlorophyll-a (hereafter chl-a) (4.32-8.24 μg l−1) compared to other ports. Spatio-temporal variation of chl-a concentration was not significantly correlated with abundances of N. scintillans (p>0.01). However, relatively high chl-a concentrations were consistently recorded along with high abundances of N. scintillans throughout all stations at Gwangyang compared to other ports. Abundances of N. scintillans observed at the three surveyed ports did not significantly (p>0.01) affect the concentration of dissolved oxygen in the surface mixed layer, indicating that the species abundances were not enough to cause reduction of dissolved oxygen during the study period. Presented results indicated that the Gwangyang seaport may provide the most suitable environment for a wide range of N. scintillans blooming compared to other ports.