수면량과 집중력의 상관관계

김병우,류지근,박우진,박계원,김미정,임지은,백대현,최재덕,최윤호,이가현,이관,김덕수 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1

수면, 기억 그리고 학습의 연관성은 실제 매우 복잡하다. 많은 연구에도 불구하고 명확한 연구결과는 아직 없다. 우리는 이 연구에서 평소와는 달리 시험 전날 수면 변화 양상이 집중력에 어느 정도 영향력을 미치는지 알아보고자 하였고, 이를 이용해 효율적인 수면 관리를 할 수 있는 기초자료로 삼고자 하였다. 동국대 의대 본과 1학년생 중 지원자 30명과 본과 2학년생 10명을 대상으로 평상시 상태와 시험 직후 수면이 부족한 상태에서 각각 K-PES TEST를 실시하여 총 8항목에 걸쳐 암기력, 판단력, 단순반응의 변화정도를 검사하였다. 또 설문조사를 병행하여 결과에 영향을 미칠 수 있는 다른 인자들도 파악하였다. 수면량에 대한 부호 숫자 짝짓기(순간 판단력)을 검사한 결과, 인간의 최대 생리학적 기능은 꼭 수면부족에 의해 좌우되는 것은 아니다. 그러나, 수면감소는 피로를 증가시키고, 동기부여를 감소시키나 단, 새로운 사실을 학습하는 데에는 큰 영향을 끼치지 않는다. 즉, 수면부족으로 장시간 깨어있는 것은 정확성과 반응성을 떨어뜨린다. 흡연에 대한 부호 숫자 짝짓기(순간 판단력)을 검사한 결과, 니코틴의 수면에 대한 상호관계는 알려지지 않았고, 인간의 감정이나 의식, 인식에 영향을 주는 것으로 알고있지만, 장기적은 측면에서 흡연이나 알코올은 인식능력과 무관한 것 같다. 카페인에 대한 숫자 외우기(암기력)검사 결과, 카페인은 spacial selective attention에는 특별한 영향을 주지 않지만 지각과정이나 주의 집중에 큰 효과를 주며, 인간의 의식 수행에 긍정적인 효과를 준다. 즉 카페인은 활력, 혼란, 피로상태를 변화시키고 visual analog scales에서 휴식상태에 가까운 양상을 나타낸다. 또 48시간 동안 수면을 취하지 않은 사람에게 카페인은 집중력과 장시간의 좋은 기분을 유지하게 하였다. 그러나 규칙적, 비규칙적으로 먹는 사람간에는 인지수행력의 차이를 보이지 않으며 상용자에서는 상당한 내성이 보인다. 수면패턴에 대한 숫자 더하기(순간 판단력)검사 결과, 집중력은 수면패턴에 의해서도 영향을 받고, 수면패턴이 바뀌게 되면 순간판단력을 저하시킨다. This study was performed to evaluate relationship of sleep and attention, and to control sleep effectively. We conducted a K-PES test of 40 medical students. K-PES contains eight elements, for example, simple response, selective response, color pairing, OddEven discrimination, number addition, number-symbol matching, memory, right-tapping, left tapping. Through these, we tested changes of memory, judgement, simple response. And we conducted a questionnaire survey to exclude bias. Results are as follows. As a results of number-symbol matching test, we know that sleeplessness is not complete responsible for physiologic function for humans. But, decreased sleep increases fatigue and decreases motivation, but no influence on learning new materials. So, long term sleeplessness decreases precision and responsibility. As a results of number-symbol matching test on smoking, a relationship of nicotine and sleep is not certain. A point of view in long term period, smoking and drinking is not related cognition, even if we know that those influence mood, consciousness and cognition. As a results of memory work test on caffeine, caffeine does not influence spacial selective attention, but mainly does perception, attention and consiousness process. Namely caffeine changes energetic activities, chaos, fatigue states and shows resting state in visual analog scales In sleeplessness for 48 hours, caffeine produced attention and good mood for a long time. But, in case of cognitive process no significance shows in regular or irregular diet. Regular diet shows high resistance. As a results of number addition test on sleep patterns, seep patterns influence attention, changes of sleep patterns decrease a moment judgement.

개에서 발생한 폐수종의 치료 증례

김유수,심재현,김건우,김지용,이병희,송근호,이영원,김덕환 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

A 9 months intact male American bull dog with chief complaints of dry cough, dyspnea and fever was referred to the Veterinary Teaching Hospital, Chungnam National University. Based on the findings of physical examination, radiological examination, and blood and blood chemical examinations, the present patient was diagnosed into pulmonary edema secondary to primary bacterial and aspiration pneumonia. The patient was hospitalized and treated with buscopan, cephazolin and furosemide for 1 week. His activity and appetite was returned to normal and thoracic radiographs revealed that Jung was recovered to the normal condition after treatment for 7 days. The present patient was a case with pulmonary edema showed favorable therapeutic responses to proper medication.

급성신부전증 이환견에 대한 복막투석 치료 1례

김건우,이병희,김유수,심재현,김지용,이영원,김덕환,송근호 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

A fourteen-month-old intact female Poodle was referred to the Veterinary Teaching Hospital, College of Veterinary Medicine, Chungnam National University. The patient was presented with history of vomiting, inappetence, ataxia, insomnia, tachypnea and convulsion for 5 days. Biochemical examination revealed BUN (254.2 mg/dl), creatinine (9.22 mg/dl) and phosphate (14 mg/dl). Epithelial cells of urinary tract, neutrophils, macrophages, a large number of gram negative and smaller number of gram positive bacteria were presented on urine test. Ultrasonographic findings show hyperechogenic kidney and indistinguishableness of renal cortex and medulla. Based on the results of examination described above, this case was diagnosed as acute renal failure with interstitial nephritis by urinary tract infection (UTI). Treatments with fluids therapy, diuretics, and peritoneal dialysis during hospitalization showed good results with no clinical signs.

韓國人의 各 臟器組織中 靑酸鹽의 微量分布에 關한 硏究(Ⅱ)

張成吉,金恩浩,金英雲,李鎭勳,柳在薰,權五星,金明德,吳世珍,金由那 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

형광백혈구 안저촬영술에서 플로레신 염색의 안정성과 형광림프구의 분리

김윤희,강필성,김강주,양연식,김재덕 圓光大學校 醫科學硏究所 1998 圓光醫科學 Vol.14 No.1

Recently, retinal blood flow has been studied with several methods, targeted dye delivery method, fluorescent vesicle system, laser Doppler velocimetry, acridine orange staining method. Authors presented a new method, fluorescein leukocyte angiography using a scanning laser ophthalmoscope which include external staining of leukocyte with fluorescein dye and reintroduce the fluorescent leukocyte into the blood flow. Authors tried to check security of external fluorescein staining of leukocytes and separation of fluorescent lymphocytes from whole blood and supernatant fluid using Ficoll-Paque, with cell viability, leukocyte recovery rate and erythrocyte contamination rate. There was no significant difference in cell viability, leukocyte recovery rate and erythrocyte contamination rate between fluorescein staining group and non-staining group. Fluorescent lymphocytes could be separated from whole blood and supernatant solution after gravity sedimentation with 6% hetastarch and the gravity sedimented group had low erythrocyte contamination rate than whole blood group(p≤0.05). In conclusion, external fluorescein staining procedure of leukocyte during fluorescein leukocyte angiography could be performed without cell injury compared to non-fluorescein staining group and fluorescent lymphocyte could be separated from whole blood and supernatant fluid after gravity sedimentation.

SOLUBILITY OF NITROGEN IN CLEAN EIRE EXTINGUISHING AGENTS AT HIGH PRESSURE

Kim,Jae-Duck,Lim,Jong-Sung,Lee,Youn-Woo,Lee,Youn-Yong 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-

Isothermal solubilities of nitrogen in clean fire extinguishing agents, such as bromotrifluoromethane (Halon-1301), bromochlorodifluoromethane (Halon-121 t), 1,1,1,2,3,3,3- heptafluoropropane (HFC-227ea), and trifluoroiodomethane (FIC-13I1) were measured in a circulation-type equilibrium apparatus. The temperature range was (293.2 to 313.2) K and the pressure range was (30 to 100) bar. The experimental data were well correlated with the Peng- Robinson equation of state using the Wong and Sandier mixing rules, and the relevant parameters are presented.

소동물 임상에서 침술마취의 적용

김명철,김덕환,전무형,홍성혁,박창식,이재일,이수진,김영석 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8

Pain modification is an important part of traditional acupuncture therapies. However, the idea of using acupuncture to alleviate pain has been greatly expanded in the last four decades. It has reached the level that acupuncture may be used as a substitute for conventional anesthesia. Surgical analgesia can be produced by methods involving peripheral or central stimulation, such as Acupuncture Analgesia (AA). The most common method is Electro-Acupuncture Analgesia (EAA). using a special electrostimulator attached to needles in acupuncture points. The major advantages of AA or EAA are its safety in high-risk patients and excellent post-operative pain relief, freedom from complications and enhanced healing which follows surgery under AA. The major disadvantages are the long induction period (10-40 minutes) and variable degrees of analgesia, even in skilled hands. The mechanisms of AA Involve stimulation of peripheral sensory nerve, spinal cord and supraspinal areas (thalamus, midbrain and hypothalamus) AA can be used effectively in dog. The method has its advantage, and disadvantages.

인간의 시각 특성을 고려한 JPEG 기반의 양자화기 설계

김정규,이재덕,허영,윤태성 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

JPEG, which is a standard compression algorithm for the still image, was designed in consideration of general characteristics of the images. So, it can't reflect local characteristics such as edges well when compressing image. Therefore, lots of data loss are occurred at edges which are very sensitive to human visual system(HVS). In this paper, a scheme is proposed that improves those defects of JPEG is proposed. The sequence of the proposed scheme is as follow. First, we analyze the DCT coefficients of an image and judge the edges in the image. Second, if edges are existed, we enhance the edges by weighting the frequency parts sensitive to HVS and more compressing the frequency parts insensitive to HVS of the coefficients that are related to the edges. Computer simulation results show that the proposed compression scheme has a little inferior performance in the objective assessments such as compression ratio and PSNR, however gives superior performance of image quality improvement in the subjective assessment to JPEG.

법과학적 응용을 위한 섬유의 동일성에 관한 연구(Ⅰ) : FT-IR, PY-GC에 의한 섬유의 동일성에 관한 연구 A Study on the Identification of Textile by FT-IR & Py-GC

김은호,김명덕,김재균,박하선,장성길,박성우 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

송전선로에서 가공지선에 대한 내부부식 검출과 잔존수명 예측

金成德,沈在明,鄭才基 한밭대학교 산업과학기술연구소 1995 논문집 Vol.3 No.-

Deterioration of transmission line conductors leads to reduce the safety and reliability of power supply. Therefore, it is important that the replacement program of transmission lines will be established by a proper criteria. The accessment of transmission lines and the determination of the useful life of transmission system components is commonly used a transmission refurbishment curve with age, but this data may be not suitable to the present transmission network because of variaty of environmental parameters in the corrosion process. Since the corrosion of ACSR(Aluminum Stranded Conductor Steel Reinforced) is mainly caused by atmospheric pollutants and contaminants, then, the remaining life of the transmission components can be determined and analyzed through these chemical reactions. Especially, overhead ground wires which is protected transmission system from lightning strokes or abnormal current induced from the conductors, will be rapidly degraded with age by these operations besides such atmospheric corossion. The aim of this research is to provide two prediction indices of tensile strength loss for the overhead ground wires. Under testing refurbished overhead ground wire samples in domestic transmission lines, for the aluminum and galvanized steel strands, the prediction loss of tensile strength with years i estimated. It is shown that the prediction index can be used in determining the remaining life of the overhead ground wires. Furthermore, an NDT(nondestructive testing) eddy current sensor is proposed in order to detect innner corrosion of the ground wires. It can be verified that the tensile stength of the ground wires in service may be closely related with impedance deviations for the samples. Then, the other index to predict the tensile stength for the overhead ground wires through the impedance of the sensor is also given.