저주파수 및 저입력전압용 박막형 다중접합 열전변환기

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.

축구선수의 Detraining과 Retraining이 혈청지질 및 호르몬농도에 미치는 영향

정정화,박재현,채종훈,성혜련,황지인,윤미숙,노금선,윤종관,윤영학,노순덕,정경숙,박일규,김은희,박현태,박상갑 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1

The purpose of this study was to investigate the effects of detraining and retraining on serum lipid and hormones in soccer players. Subjects were seven male high-school soccer players. V˙O_2max was determined for each subjects by administering a treadmill test(initial speed: 90m/min, grade: 5%, increasing speed per 3 min: 30m/min). Serum lipid(T-C, TG, HDL-C LDL-C) and hormones(epinephrine, norepinephrine, growth hormones, cortisol) were assayed pre and post detraining in 10, 20, 30 days after retraining. The repeated ANOVA was used to determine significant differences. The 0.05 level of significance was as critical level for the study. The results of the study were as follows: 1. V˙O_2max(ml/min) were 3576.3±204.2ml/min pre detraining, 3234.1±198.9 ml/min post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/min) were 3601.4±170.9 ml/min. There were significantly(p<.05) increased in retraining periods. 2. V˙O_2max(ml/kg/min) were significantly(p<.05) decreased from 62.3±2.9 ml/kg/min to 55.9±4.7 ml/kg/min in detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/kg/min) were 62.4±3.4ml/kg/min, 62.7±2.3ml.kg/min, 67.3±7.2ml/kg/min respectively. There were significantly(p<.05) increased in retraining periods. 3. T-C were significantly (p<.05) increased from 166.6±8.5mg/dl to 175.3±10.3 mg/dl in detraining. In 10, 20, 30 days after retraining, T-C were 160.1± 3.2mg/dl, 156.7±3.7mg/dl, 140.3±9.0mg/dl. There were significantly(p<.05) decreased in retraining periods. 4. HDL-C were 61.4±6.6mg/di pre detraining, 5.3±6.6mg/dl post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, HDL-C were 56.9±7.1mg/dl, 56.4±9.2mg/dl, 57.7±9.1mg/dl respectively. There were no significant difference in retraining periods. 5. The hormones(epinephrine. norepinephrine, growth hormone, cortisol) were changed as same patterns. Epinephrine were 26.0±7.0[g/ml pre detraining, 24.6±3.2pg/ml post detraining. In 10, 20, 30 days after retraining, epinephrine were 26.9±5.6pg/ml, 30.6±6.2pg/ml, 29.4±5.6pg/ml respectively. There were no significant difference in retraining periods. In conclusion, HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were decreased, T-C, LDL-C and TG were increased in detraining. But HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were increased, T-C, LDL-C and TG were decreased in retraining.

유기산의 해리평형에 미치는 치환기 효과와 그의 온도 및 압력의 영향. : (2) 수용액중에서 몇가지 치환나프톨류의 해리상수 (2) Dissociation Constants of Some Substituted Naphthols in Aqueous Solution

黃正儀,裵俊雄,鄭倧在,鄭在元,張景喜 慶北大學校 物理化學硏究所 1986 硏究論文集 Vol.7 No.-

치환나프톨류(4-Cl-1-Naphthol, 6-Br-2-Naphthol, 8-NH_2-2-Naphthol)의 해리상수를 온도(25∼40℃)와 압력(1∼2000 bar)을 변화시키면서 분광학적 방법으로 측정했다. 이들의 해리상수는 치환기가 들어가므로서 모두 감소했다. 이것은 치환기의 I-효과로서 설명이 가능했으며 또 온도와 압력이 증가하면 해리상수도 증가하였다. 이들 해리상수로부터 반응의 열역학적 성질을 계산하여 반응의 성질을 알아보았다. The dissociation constants of 4-Cl-1-naphthol, 6-Br-2-naphthol, 8-NH_2-2-naphthol in aqueous solution were measured by spectroscopic method in the temperature range from 25 to 40℃ and pressure up to 2000bar. The dissociation constants were decreased as the substituents were inserted in naphthol from 4.4×10 exp(-10) to 5.82×10 exp(-11) as chloride compound and 2.5×10 exp(-10) to 3.44×10 exp(-11) or 4.21×10 exp(-11) as bromine or amino compounds, respectively. This decrease can be explained with the I- or R-effects of substituents. From the dissociation constants various thermodynamic properties were claculated and discussed the characteristics of the dissociation reaction.

흰쥐 대뇌피질에서의 Cholecystokinin Octapeptide의 分布

황정한,조희중,김은희,박매자,배용철,홍해숙,주강 慶北大學校 醫科大學 1990 慶北醫大誌 Vol.31 No.4

흰쥐 대뇌피질에서 cholecystokinin octapeptide(CCK-8)의 분포를 관찰하기 위하여 간접면역형 광법을 행하여 관찰해 본 결과 다음의 많은 부위에서 CCK-8양성세포 및 양성섬유를 관찰할 수 있었다. 신피질: CCK-8양성세포는 주로 제2, 3층에서, 양성섬유는 제2, 3 그리고 6층에서 저밀도를 나타내었다. 후구: 전후핵에서 많은 CCK-8양성세포 및 양성섬유를 관찰하였다. 이상엽 및 후내야: 양성세포는 주로 제2층에서 관찰되었으며 양성섬유는 제2층에서 중밀도 제3층에서 저밀도로 관찰되었다. 해마체: 많은 양성세포 및 고밀도의 양성섬유가 원추세포층에서 관찰되었다. In order to investigate the distribution of immunoreactive cholecystokinin octapeptide (CCK-8) containing neurons in the cerebral cortex of the rat, brains of the rats were processed for indirect immunofluorescent technique. The results obtained were as follows. Neocortex; CCK-8 immunoreactive cell bodies were found in layer Ⅱ and Ⅲ and immunoreactive axon terminals were heaviest in layers Ⅱ, Ⅲ and Ⅵ. Olfactory bulb; The anterior olfactory nucleus contained numerous CCK-8 immunoreactive cell bodies and a moderate density of immunoreactive axon terminals. Piriform and entorrhinal cortex; CCK-8 immunoreactive neurons and axon terminals were observed in layer Ⅱ and Ⅲ. However, they were more frequent in layer Ⅱ. Hippocampus; CCK-8 immunoreactive cell bodies and axon terminals were found in pyramidal layer.

코스틱스법에 의한 순수 전단장치 평가에 관한 연구

황재석,김원현,서정희 嶺南大學校 工業技術硏究所 1998 工業技術硏究所論文集 Vol.26 No.1

There are many experimental devices for pure shear test such as off-axis tension test pure shear test for Iosipescu conceptions. Arcan circular disk for Arcan conceptions and the general pure shear test and Hawong Iosipescu shear test(H.I.S.T.) etc.. Hawong Iosipescu shear test(H.I.S.T.) device is analyzed through caustics. It is assured that H.I.S.T. device is more effective than Iosipescu shear test(I.S.T.) device for the measurement of stress intensity factor from causic. It is known that H.I.S.T. device without notch is most effective as pure shear test device, between H.I.S.T. device and I.S.T. device for caustics, but H.I.S.T .device and I.S.T. devices are can be used ad pure shear test device

韓愈潮州刺史左遷時往返路程考

黃 喜 中國語文硏究會 1997 中國語文論叢 Vol.13 No.-

韓愈 '排佛興儒'의 原因에 관한 연구

황정희 中國語文硏究會 1998 中國語文論叢 Vol.14 No.-

죽재를 이용한 콘크리트의 사용성에 관한 실험적 연구

鄭熺孝,金洪俊,李承列,黃俊碩 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-

The purpose of this study is about the possibility of using bamboo to reinforce concrete in comparison with the reinforced concrete in the same experimental condition by conducting concrete using bamboo material and mechanical test of a bamboo. As a substitute material for the reinforced concrete, to check the possibility of using concrete with bamboo material either saving iron resources or developing lighter material was tried. Conclusions of this study can be summarized as follows; In contrast to reinforced concrete, bamboo concrete was failed brittly about cracked state, the failure was occurred by slip between concrete and bamboo before it reached yielding stress of bamboo. In the pullout test, bamboo pullout specimens were crushed by brittle crack and steel bar pullout specimens by pullout failure.

2.45GHz 대역 LTCC Balun-BPF의 설계

정을영,최경,황희용 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B

This paper presents a LTCC Balun-BPF, which is a BPF(band pass filter) with a Balun in a single LTCC chip for the direct interface with a MMIC chip having balanced inputs. The physical dimension of the designed Balun-BPF is 2.4x2.0x0.88 ㎣ and the used dielectric constant E_(r) is 36. A Balun of three-lines structure with striplines and a BPF of comb-line structure was combined into the Balun-BPF. The simulated result shows 4.8dB of insertion loss, 178~179 degree of the phase imbalance, 14dB of the return.

초고주파대역 발룬의 설계

정을영,황희용 강원대학교 정보통신연구소 2007 정보통신논문지 Vol.11 No.-

In this paper, Not only brief reviews for typical baluns of wireless communication systems, such as the Marchand balun, the microstrip balun, etc, but also a design of Balun-BPF, which is a BPF with an unbalanced input and two balanced outputs using a dual-mode ring resonator, are presented. The fabricated Balun-BPF shows 2-pole BPF characteristics with bandwidth of 42 MHz and insertion loss of 2.4 dB at a center frequency of 2.45 GHz. These improved baluns and the Balun-BPF could be useful to design RF/MW/mm-wave systems that require small size and light weight.