太陽熱 集熱板의 光選擇 吸收膜 開發에 관한 硏究

金仁湖,崔圭晃,崔洪守,朴仁坤,鄭淳英 慶尙大學校 기초과학연구소 1985 基礎科學硏究所報 Vol.1 No.-

There are many kinds of the solar system as known well in the solar energy utilization, the flat plate solar energy collectors are to be dealt as the most important factors among those. The estimation of efficiency in solar collector is mainly depended on the various condition and properties of the collective plate. While maintaining poor infra-red radiating properties, the solar energy is captured efficiently by the solar selective absorbing surface in the high intensity visible and near infra-red spectral regions. The solar selective absorbing surface (SSAS) is profitably employed the improvement of efficiency for the absorber plate. The fabrication of SAS was preliminarly electroplated nickel and zinc on the base of iron, copper and brass plate secondary was formed CuO and FeO black coating on the each species made up. The solar absorptance(α), emittance (ε) and those ratio (α/ε) of the fabricated species were measured for various plating time, current densities and thickness. The fabricated species Cu/Zn/CuO, Cu/Zn/FeO, Cu/Ni/CuO, Cu/Ni/FeO, Fe/Zn/CuO, Fe/Zn/FeO, Fe/Ni/CuO, Fe/Ni/FeO, Brass/Ni/FeO, Brass/Zn/CuO and Brass/Zn/FeO were measured higher ratio(α/ε) compared with the other. Fig.(2) and (3) were shown the absorptance, emittance and ratio of the selective absorbing surface(SAS) Cu/CuO and Fe/FeO at various thickness. Fig.(4)∼(6) and Fig.(7)∼(9) were shown α and ε of these SAS under the accelerated humidity condition and by the thermal durability test. Fig.(10-A,B) and (11-A,B) were presented a microscopic figure of Cu/Ni/CuO and Fe/Zn/FeO SAS before and after the thermal durability test.

탄성표면파 공진기의 설계 및 제작에 관한 연구

정관수,황금찬,황인갑 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.1

In this paper the design and fabrication of SAW resonator which could be used as a narrow-band pass filter and its characteristics are studied. The reflector of SAW resonator is designed to be resonated at 69.76㎒ by arraying the 150 metal electrodes of 12.5 ㎛ width which give 99.7% reflection coefficient, and the out put IDT's are designed at 69.7 MHΖto detect the stored energy between refctors. A SAW resonator is fabricated by depositing A1 on the surface of YZ-LiNbO₃which is piezoelectrics using photolithographic method, and it is shown that the resonant frequency of fabricated SAW resonator was obtained at 68.76 MHΖ approximately closed to the theoretical resonant frequency.

Shear場下에서의 超音波 吸收에 關한 硏究

崔圭晃,金仁湖,崔洪守 慶尙大學校 1980 論文集 Vol.19 No.1

According to the swarm theory of the nematic liquid crystals, ware investigated the ultrasonic attenuation phenomena under the strong external condition such as the shear, thermal and electric field. The experimental results were shown to be distinguishable from the normal conditions. The periodical curve representing the attenuation in the shear field was appeared as the sine curve. It was considered that these phenomena were due to the long molecules orientation effect.

플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.

Molecular Analysis of Anthocyanin Biosynthetic Genes and Control of Flower Coloration by Flavonoid 3',5'-Hydroxylase (F3'5'H) in Dendrobium moniliforme

Whang, Sung-Soo,Um, Wan-Sook,Song, In-Ja,Lim, Pyung-Ok,Choi, Kyung,Park, Kwang-Woo,Kang, Kyung-Won,Choi, Mi-Sun,Koo, Ja-Choon 한국식물학회 2011 Journal of Plant Biology Vol.54 No.3

Dendrobium moniliforme is a native species of Korea. The flower of this species is composed of a reproductive column and white perianths including petals, sepals and lip, but the base of the column bears reddish purple pigment spots. Anthocyanins are major pigments that contribute flower color in Dendrobium. Three key anthocyanin biosynthetic genes encoding dihydroflavonol 4-reductase (DFR), chalcone synthase (CHS), and flavonoid 3',5'-hydroxylase (F3'5'H) were isolated and analyzed for their expression patterns in floral organs to understand the molecular mechanism underlying flower color development. Quantitative RT-PCR analysis revealed that F3'5'H transcripts were highly accumulated in the base of the column compared with those of perianths, but the other two genes showed no significant difference among the floral organs. Microprojectile bombardment using the white perianths revealed that the transient expression of F3'5'H gene, but not DFR and CHS genes, was sufficient to produce reddish purple colored pigmentation. These results suggest that the lack of colors in perianths of D. moniliforme is at least due to transcriptional control of F3'5'H. The data presented here may improve our understanding of the mechanisms underlying floral color development in D. moniliforme and contribute to advances in orchid biotechnology.

Estrogen 多量長期投與가 家兎子宮 및 肝臟組織의 水分 및 電解質에 미치는 影響

黃寅蘭,李壽鍾 우석대학교 의과대학 1970 우석의대잡지 Vol.7 No.2

Author has attempted to clarify the effects of sex hormone on electrolytes in the tissue of uterus and liver tissue of mature female rabbits weighing about 2kg. Determination of electrolytes level of the uterus and liver tissue after administration of estrogen 50,000 I.U. daily for 2 weeks after castration were undertaken. Leves of Cl, Na, K, Ca, Mg and water contents in the organ tissue mentioned in the foregoing were determined and changes in electrolytes leval, comparison of the electrolytes and water contents in these organ tissue were undertaken after a long term administration of estrogen in large doses on castrated rabbits. Flame-photometry was utilized for the determination of Na and K levels, Schales and Schales method for Cl contents and Kovacs and Tarnoky's method for Ca and Mg contents. The Results obtained are summarized as follows: 1. Serum electrolytes level of Rabbits following castration produced no appreciable changes but a long term administration of estrogen in large doses to castrated rabbits produced a decrease in Cl, Mg levels, whereas a marked increase in Ca level. 2. Castration of female rabbits produced a marked increase in Cl and Ca levels and marked decrease in Mg level of uterine tissue. A long term administration of estrogen in large doses on castrated rabbits produced a marked increase in Ca, K and water content. 3. Castration of female rabbits produced a increase in Na, Mg and decrease in K level of the liver tissue. A long term administration of estrogen of large doses to the castrated rabbits produced a marked increase in Na, Ca water content and a decrease in Mg level of the liver tissue. 4. Water content of the liver tissue normal, castrated, and large doses of estrogen administered rabbits showed a marked decrease as compared to that of liver tissue. 5. Cl content of the liver tissue showed a marked decrease in comparison with that of the uterine tissue of normal, castrated and estrogen administered female rabbits. 6. Na content of the liver tissue showed a marked decrease in comparison with at of the uterine tissue of normal, castrated and estrogen administered female rabbits. 7. K content of the liver tissue showed a marked increase in comparison with that of the uterine tissue of normal castrated and estrogen administered female rabbits. 8. Ca content of the liver tissue showed a marked decrease in comparison with that of the uterine tissue of normal, castrated and estrogen administered female rabbits. 9. Mg content of the liver tissue showed a lower level than that of the uterine tissue of normal, castrated and estrogen administered female rabbits.

발달성 언어장애아의 임상적 고찰

김수진(Soo Jin Kim),김영훈(Young Hoon kim),이윤경(Yoon Kyung Lee),김동언(Dong Un Kim),한승훈(Seung Hoon Han),정승연(Seung Yun Chung),이인구(In Goo Lee),이익준(Ik Jun Lee),황경태(Kyung Tai Whang) 대한소아신경학회 2001 대한소아신경학회지 Vol.9 No.1

목적: 발달성 언어장애는 기질적인 요인 없이 언어발달에만 지연을 초래하는 질환으로 형에 따라 아무런 조치를 취하지 않아도 자연적으로 언어발달이 정상적으로 이루어지는 경우가 많으나 언어 지연이 학령기 연령까지 지속되는 경우에는 행동장애와 학습장애를 비롯하여 여러 가지 이차적 문제를 일으키기 때문에 조기발견과 치료를 위하여 소아과 의사가 지속적으로 관심을 가져야 한다. 본 연구는 언어 지연을 주소로 소아과 외래에 내원한 환아 중 정신지체, 청력장애, 유아자폐증, 구음장애 등의 기질적인 이상 없이 언어발달이 지연된 소아를 대상을 소아의 성별과 연령의 분포, 의미 있는 단어 출현의 시기 및 예후를 알아보고자 하였다. 방법: 1993년 3월부터 1997년 6월까지 가톨릭 의대 강남성모병원 소아발달 클리닉에 언어지체를 주소로 발달 및 언어검사를 받았던 171명의 소아 중 기질적 요인이 없는 발달성 언어장애를 보여 6개월 간에 추적관찰이 가능하였던 75명(남아 65명, 여아 10명)을 대상으로 하였다. 결과: 1) 대상환아 75명 중 남아가 86.7%, 여아가 13.3%로 남녀 비는 6.5:1이었으며 평균연령은 31.4개월로 24개월-35개월이 60%를 차지하였다. 2) 평균재태기간은 38.8주로 만삭아는 82.7%, 미숙아 17.3%이였다. 3) 가족력상 첫째는 82.7%, 둘째는 13.3%, 셋째는 4% 이었다. 4) 뇌 자기공명검사는 총 10명에서 시행하였는데 4명에서 이상소견을 보였으며 뇌파검사는 총 23명에서 시행하였는데 2명에서 이상소견을 보였다. 5) 의미있는 첫 단어의 평균 출현시기는 13.8개월 이었다. 6) Gesell 발달 검사상 각 영역 DQ가 70 미만인 환아는 운동영역 4%, 적응영역 17.3%, 언어영역 66.7%, 개인성 사회성영역 33.3%이었다. 7) REEL 언어 검사상 각 영역 DQ가 70 미만인 환아는 수용언어영역 70.7%, 표현언어영역 90.7%이었다. 8) 6개월 후에 추적 검사한 결과는 지속적인 언어지연을 보인 환아는 17.3%이었으며 정상적인 언어발달을 보인 환아는 82.7%이었다. 결론: 이상의 결과로 언어지연을 주소로 내원한 환아의 많은 수가 기질적 요인이 없는 발달성 언어장애였으며, 이중 대부분이 6개월에 시행한 추적검사에서 언어발달의 향상을 보였음을 알 수 있었다. Purpose: Children with developmental language disorder occupy considerable health care resources, particularly in the preschool ages. The exact size of problem for health planning remains somewhat problematic, as differences in reported estimates of prevalencies reflect the range of definitions used. In this study, we evaluated the clinical features of children with developmental language disorder and examined effctiveness of the Gesell Screening inventory and REEL scale to assess language development. Methods: The 171 children were involved in the study, they were referred to Child Development Clinic in Kangnam St. Mary's Hospital for evaluation of suspected language problem. Among the children, 75 cases between 15 and 54 months of age were included as developmental language disorder in this study. Results: 1) The mean age of subjects was 31.4 months and ratio of male to female was 6.5:1. 2) The mean gestational age of the subjects was 38.8 weeks. The proportion of full-term infants was 82.7% and the one of premature infants was 17.3%. 3) According to the birth ordering history, the proportion of the first baby was 82.7%, the one of second baby was 13.3% and the one of third baby was 4%. 4) Ten children had been checked up the MRI, four of them had abnormal findings, 23 children had been checked up the EEG and two of them showed abnormal findings. 5) The mean age of first spontaneous word with used meaning was 13.8 months. 6) According to the Gesell Screening Inventory, the proportion of children who had less than DQ 70 had showed 4% in motor sector, 17% in adaptive sector, 66.7% in language sector and 33.3% in personal social sector. 7) according to the REEL Scale, the proportion of children who had less DQ 70 had showed 70.7% of in receptive language sector and 90.7% in expressive language sector. 8) The proportion of the children who had been maintaining language disorder was 17.3% and that of those who showed normal linguistic development was 82.7% on the follow-up test 6 months later. Conclusion: The large proportion of the children who had language delay was developmental language disorder without organic problem. Most of them showed symptom improvement on the follow up test 6 months later.

Mycobacterium avium MAV2052 protein induces apoptosis in murine macrophage cells through Toll-like receptor 4

Lee, Kang-In,Choi, Han-Gyu,Son, Yeo-Jin,Whang, Jake,Kim, Kwangwook,Jeon, Heat Sal,Park, Hye-Soo,Back, Yong Woo,Choi, Seunga,Kim, Seong-Woo,Choi, Chul Hee,Kim, Hwa-Jung Springer-Verlag 2016 Apoptosis Vol.21 No.4

<P>Mycobacterium avium and its sonic extracts induce apoptosis in macrophages. However, little is known about the M. avium components regulating macrophage apoptosis. In this study, using multidimensional fractionation, we identified MAV2052 protein, which induced macrophage apoptosis in M. avium culture filtrates. The recombinant MAV2052 induced macrophage apoptosis in a caspase-dependent manner. The loss of mitochondrial transmembrane potential (Delta I-m), mitochondrial translocation of Bax, and release of cytochrome c from mitochondria were observed in macrophages treated with MAV2052. Further, reactive oxygen species (ROS) production was required for the apoptosis induced by MAV2052. In addition, ROS and mitogen-activated protein kinases were involved in MAV2052-mediated TNF-alpha and IL-6 production. ROS-mediated activation of apoptosis signal-regulating kinase 1 (ASK1)-JNK pathway was a major signaling pathway for MAV2052-induced apoptosis. Moreover, MAV2052 bound to Toll-like receptor (TLR) 4 molecule and MAV2052-induced ROS production, Delta I-m loss, and apoptosis were all significantly reduced in TLR4(-/-) macrophages. Altogether, our results suggest that MAV2052 induces apoptotic cell death through TLR4 dependent ROS production and JNK pathway in murine macrophages.</P>

비장동맥류

정석인,황정웅,남영수 대한혈관외과학회 1994 Vascular Specialist International Vol.10 No.1

Splenic artery aneurysm is uncommon, but the more frequent use of arteriography, computed tomography, and ultrasonography has resulted in increasing clinical recognition of these lesions. Three distinct factors may contribute to the development of splenic artery aneurysms. Arterial degeneration has been implicated as the cause of splenic artery aneurysms in pregnant women. In this group of patients, there is an increased incidence of splenic artery aneurysm, which is further aggravated in grand multipara. For evaluation of the relation;o pregnancy, characteristics of rupture and etiology of splenic artery aneurysm, six cases of splenic artery aneurysms were retrospectively analyzed who were treated in the Korea University Hospital, from January 1992 to April l994. In 6 cases of splenic artery aneurysm, 5 cases were operated. The results were as follows: Male patients were 3 cases and female patients were 3 cases. In 3 female patients, ruptured aneurysm during the pregnancy was not found. The number of pregnancies were 0, 2, 3 respectively. The ruptured aneurysms were found in 19 year old male, 23 old female and 45 year old female with liver cirrhosis and portal hypertension. The etiology of aneurysms were as follows: portal hypersion with splenomegaly: 1, focal arterial inflammatory processes: 1, ill defined pathogenesis: 3. In conclusion, all cases of splenic artery aneurysm were over 2 cm in diameter. We recommended operation. The pregnancy was not related to rupture of splenic artery aneurysm. In 3 ruptured cases of splenic artery aneurysm, 2 patients were young healthy patients. In evaulating young patients with hemoperitoneum who had no history of trauma, we must think the possibility of splenic artery aneyrysm rupture. The etiologies of splenic artery aneurysm were similar with those of westerners.

건강 수진자에서 혈청 CA 125 증가의 임상적 의미

신경자,황종대,주인숙,배덕수 대한부인종양 콜포스코피학회 1998 Journal of Gynecologic Oncology Vol.9 No.3

Objectives: Our study was to determine the usefulness of CA 125 screening for asymptomatic female subjects. Though CA 125 has been used as a useful marker for the detection of ovarian cancer, its efficacy to detect early ovarian cancer in asymptomatic women has not been established. Study Design: From April 1995 to December 1997, a total of 13,038 subjects who visited our Center for Health Promotion were screened. Serum CA 125 level was measured by a radioimmunoassay kit (Centocor, USA). In most cases transvaginal ultrasound was done at the same time. The specificity, sensitivity and positive predictive value were obtained on the basis of normal CA 125 range between 2.4 ∼36.3 U/㎖. Result: 1) Two cases of ovarian cancer were detected out of 13,038 subjects screened. One ovarian cancer patient showed 1,625 U/㎖ of CA 125 levels, on the other hand, the other level patient showed 27 U/㎖. 2) Therefore, the sensitivity, specificity, and positive predictive value were 50%, 97.3%, and 0.3%, respectively. Since 346 cases out of 13,038 screened subjects showed false positive results on the basis of the upper limit of normal CA 125 level set at 36.3 U/㎖, the false positive was 2.6% 3) The CA 125 levels in false positive cases ranged from 36.3 U/㎖ to 352.8 U/㎖ with the mean value of 66.19±51.47 (S.D.). 4) The clinical features of the false positive cases included uterine myoma including adenomoysis (150), benign ovarian cyst (19), cervicitis (6), tuberculosis (3), pregnancy (2), and each one case of breast cancer, mammary cyst, endomerritis, lung cancer, liver cirrhois, pancreatic cancer, cervical cancer, renal cyst, uterine anomaly, and post TAH state. In the remainder of false positive 156 cases, no abnormal findings were observed. Among 258 patients who underwent combined tests of CA 125 and transvaginal ultrasound, the sensitivity of ovarian cancer was 100%. 5) The false positive rate was lower in the older age group ($gt;50) than in the younger group ($lt;50). Conclusion: The prevalence of ovarian cancer in our study was 0.0153% (15.3 per 100.000 population) which is comparable to the rate of 15.8 per 100.000 population reported by the Korean Medical Insurance Corporation. Although the CA 125 test by itself shows a low positive predictive value, its clinical usefulness as a screening test can be enhanced dramatically by the combined use of transvaginal ultrasound examination, especially in postmenopausal women.