흰쥐 비점막에서 혈장의 혈관외유출에 대한 산화질소의 역할

이흥만,최충식,송재준,황순재,이상학 대한이비인후과학회 2000 대한이비인후과학회지 두경부외과학 Vol.43 No.2

알레르기 비염의 비점막에서 Neurodinin 1 수용채 발현

이동진,이흥만,이상학,황순재 대한이비인후과학회 2001 대한이비인후과학회지 두경부외과학 Vol.44 No.12

펄스형 Nd-YAG 레이저 조사에 의한 법랑질 내산성 증가 기전에 관한 연구

이영순,손흥규 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.3

The purpose of this study was to examine the mechanism of improving acid resistance of Nd-YAG laser irradiated tooth enamel and determine the most effective energy density for improving acid resistance. The bovine tooth enamel were lased with a pulsed Nd-YAG laser. The energy densities of exposed laser beam were varied from 10 to 70 J/㎠. To investigate the degree of improving acid resistance by irradiation, all the samples were submerged to demineralize in 0.5 N HCIO₄ solution for 1 minute. After 1 minute, 0.05% LaCl₃ was added to the solution for interrupting the demineralization reaction. The amounts of dissolved calcium and phosphate in the solution were measured by using an atomic absorption spectrophotometer and the UV/VIS spectrophotometer, respectively. To examine the mechanism of improving acid resistance, X-ray diffraction analysis, infrared spectroscopy, and scanning electron microscopy were taken. The X-ray diffraction pattern of the samples were obtained in the 10。∼80。2θrange with Cu-Kαradiation using M18HF(Mac Science Co.) with X-ray diffractometer operating at 40 KV and 300㎃. The infra-red spectra of the ground samples in 300 ㎎ KBr pellets 10 mm diameter were obtained in the 4000 cm to 400 cm range using JASCO 300E spectrophotometer. The scanning electron microscopy was carried out using JSM6400(JEOL Co.) with 500∼2000 times magnification. The results were as follow 1. The concentration of calcium dissolved from laser irradiated enamel with 50J/㎠ was significantly lesser than that of unlased control group (p<0.05) 2. From the result of the X-ray diffraction analysis, β-TCP, which increases acid solubility, was identified in lased enamel but the diffraction peaks of (002) and (004) became sharp with increasing energy density of laser irradiation. This means that the crystals in lased samples were grown through the c-axis and subsequently, the acid solubility of enamel decresed. 3. The a-axis parameter was slightly increased by laser irradiation, whereas the c-axis parameter was almost constant except for a little decrease at 50J/㎠. 4. In the infra-red spectra of lased enamels, phosphate bands (600∼500 cm), B-carbonate bands (870, 1415∼1455 cm), and A-carbonate band (1545 cm) were observed. The amounts of phosphate bands and the B-carbonate bands were reduced, on the other band, the amount of the A-carbonate band was increased by increase the energy density. 5. The SEM experiments reveal that the surface melting and recrystallization were appeared at 30 J/㎠ and the cracks were observed at 70 J/㎠. From above results, It may be suggested that the most effective energy density for improving acid resistance of tooth enamel with the irradiation of Nd-YAG laser was 50J/㎠. The mechanism of improving acid resistance were reduction of permeability due to surface melting and recrystallization of lased enamel and reduction of acid solubility of enamel due to decrease of carbonate content and growth of crystal.

1. 06㎛ Nd : YAG Laser를 이용한 요추간판탈출증의 경피적 수핵감압술

이흥선,변박장,최순관,신원한,권귀향,이인수,이경석,김범태 순천향대학교 1994 논문집 Vol.17 No.4

The 1.06㎛ Neodymium-YAG Laser(800 micron hemisherical) is revealed a useful tool for percutaneous laser disc decompression(PLDD). Especially PLDD would be applied to the management of lumbar disc herniation with minimal intervention. Total irradiated energy to one level of disc space was bout 1000 to 2000 joules. We performed this method at 10 levels, in 7 cases of patients, consisting of 4 males and 3 females with an average age of 37.7 years. Five cases showed excellent and good results, were observed. In two cases, open surgery was required because of unsatisfactory results. The best results were obtained in the protrusion type of disc herniation. We have summarized some advantages of PLDD: a) safe and simple procedure in an outpatient setting, b) avoiding general anesthesia, late spinal instability, c) possibility of repetitive use.

해마 theta리듬과 pyramidal neuron의 세포내 특성과의 상관관계

권오흥,조진화,남순현,김현정,최병주,김영진,이만기 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.4

Eledctrophysiological phenomena of pyramidal cells in the CAI area of the dorsal hippocampus were recorded from and filled with neurobiotin in anesthetized rats. The electropharmacological properties of membrane as well as the cellular-synaptic generation of rhythmic slow activity (theta)were examined. The intracellular response characteristics of these pyramidal cells were distinctly different from responses of inteneurons. Pyramidal cells had a high resting membrane potential, a low input resistance, and a large amplitude action potential. A afterhyperpolarization was followed a single action potential. Most of pyramidal cells did not display a spontaneous firing. Pyramidal cells displayed weak inward rectification and anodal break excitation. The slope of the frequency-current relation was 53.4 Hz/nA for the first interspike interval and 15.9 Hz/nA for the last intervals, suggesting the presence of spike frequency adaptation. Neurobiotin-filled neurons showed pyramidal morphology. Cells were generally bipolar dendritc processes ramifying in stratum lacunosum-moleculare, radiatum, and oriens. Commissural stimulation discharged pyramidal cells, followed by excitatory and inhibitory postsynaptic potentials (EPSPs and IPSPs). The frequency of theat-related membrane potential oscillation was voltage-independent in pyramidal neurons. At strong depolarization levels (less than 30 mV) pyramidal cells emitted sodium spike oscillation, phase-locked to theta. The observations provide direct evidence that theta-related rhythmic hyperpolarization of principal cells is brought by the rhythmically discharging interneurons. Furthermore, the findings in which interneurons were also paced by rhythmic inhibitory postsynaptic potentials during theta suggest that they were periodically hyperpolarized by their GABAergic septal afferents.

UR에 대응한 지역농업의 발전방안 : 시설원예농업을 중심으로 With an Emphasis on the Greenhouse Horticulture Farming

배흥규,김진수,이영기,정순재,정해진,이상학 東亞大學校 1995 東亞論叢 Vol.32 No.-

The production of greenhouse horticultural products in the east region of Kyungnam province is now increasing, though the productions of other argicultural sectors have been rapidly decreasing. However, as the agricultural market lies under the big pressure of the WTO system having a goal of free trade of all commodities, greenhouse horticultural farming in the region also meets with many new problems. To identify problems and prepare development strategies of the greenhouse horticultural farming for the easten Kyungnam region, 10 villages in Kimhae, Yangsan and Miryang areas were selected as sample areas and 204 greenhouse vegetable or floriculture farms were surveyed using prepared questionaires during March-April 1995. From the analysis of the regional survey results, the following proposals are suggested for the development of regional horticultural farming : 1) There were still old-fashioned greenhouse facilities such as tunnel-type vynil house, no heating system and man-power watering. Greenhouse facilities should be modernized and automated in order to overcome the severe labour shortage problem constraining the increase of the greenhouse farming size and the enhance the degree of the commodity value by uniform quality control and year-round production. The money for the modernization and automation of greehouse facilities ned to be supported by the central government, because farmers lack the ability to fund the investment. 2) Not many farmers visited agricultural extension officers to obtain cultivation techniques of greehouse horticulture farming, because extension officers lack the manpower to help solving the greehouse farming problems. Agricultural system should be adjusted to the changing agricultural production structure. Extension manpower specialized in greehouse horticultural farming need be increased and located in the regional extension offices. 3) The major reason of farmer's pessimistic prospect for the future of greegouse horticulture was the possibility of overproduction of some horticultural products. To avoid the overproduction, new entrants to the greenhouse horticultural farming of products already culticated extensively should be limited and the government support must be given to the existing greenhouse farms and major production areas. 4) Local goverment, associated agencies, and farmers should work hard cooperatively to increase the export of horticultural products especially to Japan, the largest importer of agricultural products in the world. Local governments and associated agencies can provide informations related to the export market and provide the fund for the facilities of standardization of export products. Farmers must observe the export contracts, even though the domestic price exceeds the export price. 5) Collective marketing activities of greenhouse products were found to be mainly limited to transportation and handling of sales revenue. Central and local government should support the formation and collective activities of cooperatives of specilaized producers to enhance the bargaining power of farmers. 6) The role of local government should be increased. They should actively participate in the orientation of regional greenhouse farming and play an important role in the marketing of regional greenhouse products.

움직이는 물체의 거리 및 속도 측정을 위한 고전력 쏘나 시스템 개발

장순석,안홍구,이제형 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

This paper aims for the development of the high power sonar system for measuring the distance and the velocity of a moving object. The high power sonar system transmits two gated 190 KHz sinusoidal signals with 1.6〔ms〕 time interval to the moving object. Then the sonar system detects and calculates the changed time delay of the reflected ultrasonic signals in order to derive the velocity of the moving object. The transmission part uses a high power amplifier so that 250W gated sinusoidal signals can be transmitted to the transmitter. 1M RAM is utilized for transmitting and storing of the ultrasonic signals. The time delay is calculated by the cross-correlation technique between the transmitted signals and the received signals. The measured value from the high power sonar system is compared with directly measured values by photo diodes. The result confirms the adjacency to 0.3% error.

自律實驗 코너 運營을 通한 探究 能力의 向上

김광명,이흥순 춘천교육대학교 과학교육연구소 1998 과학교육연구 Vol.21 No.-

FET형 반도체 마이크로센서 개발(Ⅱ)

손병기,이흥락,박이순,조진호,이성필,최평,서화일,고성택,박재윤,서장수,김창수 경북대학교 센서기술연구소 1994 연차보고서 Vol.1994 No.-

현재 의료진단, 화학공정의 모니터링이나 환경공학적 감시 및 제어 등의 분야에서 사용되고 있는 기존의 센서는 고가이며 용적이 클 뿐만 아니라 분석시간이 길고 사용하기 까다로운 것 등 여러 가지 문제점이 있다. 또한 측정환경에 영향을 주지 않을 만큼 충분히 작으며 빠른 분석시간을 가진 센서를 필요로 하고 있다. 본 연구에서는 기존의 센서들의 난점을 극복할 수 있는 새로운 형태의 FET형 전해질(electrolyte : H^+, K^+, Ca^2+, Na^+)분석 시스템, 용존가스(O_2, CO_2)분석 시스템의 개발을 중점적으로 추진하며, FET형 압력센서, 습도센서, 방사형 온도센서 등의 개별 FET형 센서에 관한 연구도 병행하고자 한다. Recently various kinds of sensors have been developed, being applicated to their own purpose. There are lots of difficulties to apply them to measurements in which the real-time monitoring is required without disturbing the surrounding environment. FET type semiconductor sensors, fabricated by the semiconductor integration technologies, have many advantages for their miniaturization, standardization, mass-production and in vivo/in situ monitoring. They also hold a very proper configuration for multi-functional sensors or integrated smart sensors, and wide availability by forming various kinds of physical or chemical sensing materials onto their sensing gates.

품종별 쌀의 이화학적 특성과 증편제조 적성과의 관계

우경자,이은아,황홍구,이건순 동아시아식생활학회 1998 동아시아식생활학회지 Vol.8 No.4

This study was carried out in order to investigate the processing adaptability of Jeung-pyun. We used rice materals that were developed domestically for improving the utilization of rice. Six cultivars(Ilpoombyeo, Hwasungbyeo, Dasanbyeo, Daeribbyeo 1, Hyangmibyeo 1, Hyangmibyeo 2) of rice were used for making Jeung-pyun. In physicochemical properties of rice, Hwasungbyeo had the highest amylose content(20.4%) and Hyangmibyeo 2 had the lowest one(14.9%). Lipid content was 0.23%(Daeribbyeo 1)~0.43%(Ilpoombyeo), protein content was 7.94%(Ilpoombyeo)~8.43%(Dasanbyeo), and ash content was 0.15%(Hyangmibyeo 2)~1.24%(Daeribbyeo 1). In volume and specific volume of the 3 hour fermented Jeung-pyuns, Ilpoombyeo, Hwasungbyeo, Hyangmibyeo 2 were higher, but in the 7 hour fermented Jeung-pyuns, Dasanbyeo, Daeribbyeo 1, Hyangmibyeo 1 were higher. In the sensory evaluation of the test Jeung-pyuns, the overall quality of the 3 hour fermented Jeung-pyuns was not significantly different among the rice cultivars, whereas in the 7 hour fermented Jeung-pyuns Hyangmibyeo 2 had the lowest values. When the 7 hour fermented Jeung-pyuns were stored at 20℃, the hardness and brittleness of Jeung-pyuns were respectively increased, the cohesiveness was respectively decreased. The elasticity was not significantly different among the rice cultivars with storage days, and the gumminess was significantly difference between rice cultivars, respectively increasing during storage, but Hyangmibyeo 2 was the lowest, not increased. In instrumental characteristics of Jeung-pyuns, the hardness was correlated with amylose content and the brittleness and gumminess were highly correlated with the hardness.