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Park, Se Jin,Jeon, Hyo Sang,Cho, Jin Woo,Hwang, Yun Jeong,Park, Kyung Su,Shim, Hyeong Seop,Song, Jae Kyu,Cho, Yunae,Kim, Dong-Wook,Kim, Jihyun,Min, Byoung Koun American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.49
<P>Significant enhancement of solution-processed CuInxGa1-x(Se,S)(2) (CIGSSe) thin-film solar cell performance was achieved by inducing a band gap gradient in the film thickness, which was triggered by the chalcogenization process. Specifically, after the preparation of an amorphous mixed oxide film of Cu, In, and Ga by a simple paste coating method chalcogenization under Se vapor, along with the flow of dilute H2S gas, resulted in the formation of CIGSSe films with graded composition distribution: S-rich top, In- and Se-rich middle, and Ga- and S-rich bottom. This uneven compositional distribution was confirmed to lead to a band gap gradient in the film, which may also be responsible for enhancement in the open circuit voltage and reduction in photocurrent loss, thus increasing the overall efficiency. The highest power conversion efficiency of 11.7% was achieved with J(sc) of 28.3 mA/cm(2), V-oc of 601 mV, and FF of 68.6%.</P>
동시진공증착법으로 형성한 (Ag<SUB>w</SUB>Cu<SUB>1-w</SUB>)(In<SUB>x</SUB>Ga<SUB>1-x</SUB>)Se₂ 박막 태양전지의 Ag 첨가 효과
황지선(Jiseon Hwang),조윤애(Yunae Cho),윤재호(Jae Ho Yun),어영주(Young-Joo Eo),곽지혜(Jihye Gwak),조아라(Ara Cho),박주형(Joo Hyung Park),안세진(Se Jin Ahn),유진수(Jin So Yoo),안승규(Seung Kyu Ahn),조준식(Jun Sik Cho),김기환(Kihwan Kim) 한국태양에너지학회 2020 한국태양에너지학회 학술대회논문집 Vol.2020 No.10
황세진,정호삼,유신철,이규식 한양대학교 의과대학 1991 한양의대 학술지 Vol.11 No.1
The thyroid gland is an endocrine organ which is mainly derived from endodermal cell of the primitive pharynx. It is well known that time of morphological and functional maturation of thyroid gland is so variable among the species of animal that functionl maturation of thyroid gland of the rat occurs only after birth of the animal, while the human fetal thyroid gland can secrete thyroid hormones at 10-14 weeks of gestation. In this study the author pursued the ultrastructural differentiation of thyroid follicular cells of rats in the late fetal and early postnatal lives. The fetal rats of 18th and the 20th day of gestation and rats of the 1st, the 7th, the 14th and the 21st day of postnatal life were sacrificed and thyroid glands were extracted. Rats of the 8th weeks of postnatal life were served as control group. All specimens prefixed in 2% glutaraldehyde-2.5% paraformaldehyde and postfixed in osmium tetraoxide, were dehydrated and embeded in Epon Araldite 502. Ultrathin section about 600-800 in thickness were made with LKB ultramicrotome and stained with uranyl acetate and lead citrate and lead citrate All electron microscopic preparations were observed with JEM 100cx-II electron microscope The result obtained were as follows: 1. The nucleus of the follicular cell in the rat thyroid gland was composed of euchromatin at the 18th day of gestation, some unclei with euchromatin and heterochromatin were observed at the 20th day of gestation, and all nuclei of the follicular cells were composed of euchromatin and heterochromatin after the 1st day of postnatal life. 2. Rough endoplasmic reticulum of the follicular cell in the rat thyroid gland was consisted of column shaped scant cisternae at the 18th day of gestation, and rough endoplasmic reticulum with unmerous dilated cisterne was observed at the 7th day of gestation. 3. The Golgi complex of the follicular cell in the rat thyroid gland was composed of narrow cisternae and small sized vesicles at the 18th day of gestation. Folgi complex with wide cisternae and large sized vesicles and vacuoles was observed at the 14th day of posnatal life. 4. Mitochondria of the follicular cell in the rat thyroid gland were scanty at the 18th day of gestation and number of mitochondria increased during development of thyroid gland. 5. Lysosmes of the follicular cell in the rat thyroid gland were observed from the 1st day of postnatal life. 6. Collid lumen and microvilli of the thyroid follicle were observed from the 20th day of gestation and the matured colloid lumen was observed at the 1st day of postnated life. It is consequently suggested that the thyroid follicleis are formed from the 20th day of gestation to the 1st day of postnatal life, and cytoplasmic organelles of the folliculat cell are matured morphologically between the 7th and the 14th day of postnatal life in albino rats.
황찬순,이형주,김진섭,이정희,박세일,권성원 한국센서학회 2002 센서학회지 Vol.11 No.3
저주파수의 저전압용 크로멜-알루멜 다중접합 열전변환기를 개발하고자 NiCr 히터의 두께를400 nm, 600 nm 및 800 nm로 변화시켰다. 40 Hz∼10 kHz의 직류 역방향 주파수 범위로 0.5 V의 교류 실효전압을 열전변환기에 인가시켰을 때 히터의 두께가 400 nm인 열전변환기가 ±0.51∼±1.69 ppm 범위의 열전효과에 의한 교류-직류 전압 변환오차를 나타내었고, 열전효과 및 주파수에 의한 교류-직류 변환오차는 40 Hz∼l MHz의 주파수 범위에서 ±40∼±115 ppm 범위를 나타내어, 저주파수의 저전압용으로 사용할 수 있었다. NiCr-heaters with three different thicknesses ranging from 400 nm to 800 nm were fabricated and their characteristics were compared for the purpose of developing a chromel-alumel multijunction thermal converter for low input voltage with low frequency. The thermoelectric effect-induced AC-DC voltage transfer difference of the thermal converter with a built-in NiCr-heater of 400 nm-thickness was ±0.51∼±1.69 ppm in the DC reversing frequency of 40 Hz∼10 kHz with appling 0.5 V_rms and the difference was increased to ±40∼±115 ppm in the frequency of 40 Hz~l MHz, when both thermoelectric effects and frequency effects were considered, showing the thermal converter would be suitable for the low input voltage application with low frequency.
Interleukin-2가 Mouse 폐장의 폐포간 중격의 미세구조에 미치는 영향
황세진,김종우,정호삼,이규식 한양대학교 의과대학 1990 한양의대 학술지 Vol.10 No.1
Interleukin-2, a kind of lymphokine which is produced by activated T-lymphocytes during an immune response, is known to act not only as a growth factor for many cells of immune system but stimulates differentiation of cells of immune system. Although interleukin-2 is a useful agent for cancer immunotherapy and inhibiting agent of tumor cell metastasis, administration of interleukin-2 to cancer patient may cause various side effects such as pulmonary edema due to capillary leakage. In this experiment the author pursued the effects of interleukin-2 on ultrastructure of interalveolar septum in lung of mouse. Healthy male mice weighing about 20gm were used as experimental animals and divided into control group and experimental group. During the experiment water and foods were given ad libitum. Animals of control group were injected 0.2 ml of distilled water and animals of experimental grouup were injected 2 million units per kg body weight of interleukin-2 intraperitoneally Experimental animals were sacrified at 3 hours, 6 hours, 12 hours, 24 hours, 48 hours and 72 hours after administration and lung specimens were obtained. All specimens, which were prefixed in 2% glutaradehyde-2.5% paraformaldehyde and postfixed in osmium tetraoxide were dehydrated and embedded in Epon Araldite 502. Ultrathinsection about 600-800 in thickness, and uranyl acetate and lead citrate double stain were performed and all electron microscopic specimens were observed with JEM 100cx-II electron microscope. The results obtained were as follows: 1. The type I pneumocyte of interalveolar septum of lungs in interleukin-2 treated mice were swollen, separated from basal lamina. 2. Capillary endothelial cell of interalveolar septum of lungs in interleukin-2 treated mice were swollen, and pinocytic vesicles in endothelial cell were enlarged and increased in number. 3. Lamellar bodies of type II pneumocytes of interalveolar septum of lungs in interleukin-2 treated mice were enlarged, and vacuolized. 4. Mitochondria and microvilli of type II pneumocytes of interalveolar septum of lungs in interleukin-2 treated mice were decreased in number. It is consequently suggested that interleukin-2 induces intracellular edema of both the type I pneumocyte and the endothelial cell and damages to type II pneumocyte of interalveolar septum of lung in mice but alveolar epithelial cells and endothelial cells are recover as time goes by.
심한 저칼륨혈증을 동반한 갑상선 중독성 주기성 마비 2례
유승진,최승필,최경호,오동렬,황주일,나병호,김세경 대한응급의학회 1996 대한응급의학회지 Vol.7 No.2
Thyrotoxic periodic paralysis occurs primarily in Orientals with an overwhelming male preponderance and a higher association of specific HLA antigens. Clinical manifestations include onset after high carbohydrate ingestion or heavy exertion with progressive symmetric weakness leading to flaccid paralysis of the extremities and other muscle groups, lasting several hours. Other precipitating facters include trauma, infection, administration of epinephrine, thyroid hormone, or corticosteroid. If hypokalemia is present, potassium administration may help abort the attack. Although propranolol can be efficacious in preventing further episodes, the only definitive treatment is euthyroid state. The pathophysiology is still controversal, but reflects altered potassium and calcium dynamics as well as certain morphologic characteristics within the muscle unit itself. We discribed two patients with thyrotoxic periodic paralysis who had a no familial history of paralysis and had a decreased level of serum potassium during attack.