Electropulsing Treatment on Enhancement of Electrical Conductivity of Screen-Printed Ag Wire

Ju‑Won Park,Howook Choi,Hwangsun Kim,Simoon Sung,Hye‑Jin Jeong,Il Kim,Jaeseok Gong,Sung‑Tae Hong,Heung Nam Han 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5

The effect of high electric current density on the sintering of Ag wires manufactured by screen printing is evaluated throughelectrical resistivity analysis and microstructure observation. Different forms (continuous and pulsed) of electric currentwith different current densities are applied to the specimens. Conventional heat treatment is also performed as a controlgroup to examine the athermal effect of electropulsing treatment. Compared to the conventional heat treatment, the resistivityis reduced more under the electropulsing treatment with continuous current for the same temperature and treatment time.Also, the process time of electropulsing treatment can be reduced by applying a pulse form of high density current insteadof continuous current without losing the benefit of enhanced reduction of resistivity. The microstructural observationsobtained from high angle annular dark field scanning transmission electron microscope and a digital precession instrumentclearly show that necking connecting the crystals is formed more firmly under electric current. In addition, the temperaturechange of Ag wire and substrate is calculated according to the change of the resistivity when the electric current is appliedto confirm the reliability.

폴리 에틸렌 테레프탈레이트 섬유의 改質에 의한 染色性 改良에 關한 硏究

金公朱,姜濚義 全北大學校 1979 論文集 Vol.21 No.-

This paper concerns with the utilization of the treatment of sulfuric acid for improvement of dyeing of poly ethylene terephthalate(P. E. T) fiber. The P. E. T. fiber drafted to various times was treated with 70~74% sulfuric acid at 80~95℃ for 30~120min and neutralized with 2% ammonia. The fiber thus prepared has remarkable advantage in high yields of colours when dyed with C. I. Basic Green 4. The tensile strength of 3.2 times drafted P. E. T. fiber is as high as that of used fiber.

絹/毛混紡織物의 一浴染色法에 관한 硏究

金公朱,姜濚義 全北大學校 1988 論文集 Vol.30 No.-

Silk and wool are the two most important natural protein fibers. Because of there different Physical chemical properties the two fibers show quite different dyeability. In this study, we tride silk/wool blend fabric in one step using a one bath dyeing method. Acid dyes, 1 : 2 type metal complex dyes, and complex type reactive dyes used as the dyes. The results of the exsperiments can be summarized as follows

견/합성섬유 혼방품의 일욕염색(Ⅵ) : 산성염료/분산염료 염욕에서의 견/셀룰로오스 트리아세테이트의 염착거동 Adsorption Behavior of Acid Dyes/Disperse Dyes on Silk/Cellulose Triacetate

金公朱,박미라,강영의,김애순 全北大學校 1994 論文集 Vol.38 No.-

In one bath dyeing system of silk/cellulose triacetate(triactate) fiber blend fabric with acid/disperse dyes, adsorption behvior of acid dyes and disperse dyes on silk and triactate fabrics were examined. In the dyeing of triactate with the C.I. Disperse Red 19(Red 19) and the C.I. Disperse Red 60(Red 60) at 100℃, dye uptake with the Red 19 was higher than that with the Red 60. When the silk/triaceetate was dyed with Red 19 and the Red 60 at 100℃, dye uptake on triacetate was influenced by affinity of the dye to the silk fabric dyed together. In the treatment of the silk fabric dyed with the Red 19 and Red 60 in desorption bath with and without undyed triacetate, desorption of the dyes from the silk fabric was influenced by the affinity of the dyes to the triacetate. When the silk/triacetate was dyed with the Blue 80/Red 19 and Red 60 at 100℃, color of triacetate dyed with the Red 19 and Red 60 was not influenced by the Blue 80 but silk dyed with the Blue 80 was influenced by the Red 19.

폴리우레탄 섬유의 染色機構에 關한 硏究

金公朱,朴炳基,姜濚義 全北大學校 1980 論文集 Vol.22 No.-

Spandex is man-made elastomer fiber. Chemically, polyurethane is produced by interaction of Glycol and Diisocyanate. From a physical point of view, these Spandex fibers owe their elasticity to the same thermodynamics as rubber, therefore, the high degree of fabric stretch availability permits its use in a wide range of textile fabrics. Particular interests are to improve the dyeing properties and to find out the dyeing mechanism. So, it is the purpose of this paper to present technology which will permit these yarn to be dyed with selected dyes and to describe the dyeing mechanism.

全南 南西 海岸의 物理, 化學的 特性 및 海洋環境에 關한 硏究 : 木浦 近海와 鳥島 海域을 中心으로 With special reference to the coast of Mokpo and Jodo

曺炷煥,吳公鏞 조선대학교 기초과학연구소 1986 自然科學硏究 Vol.9 No.1

The following is a abstract of the studies analyzed and synthesized on the basis of the oceanographical data on the coast of Mokpo and Jodo island, which has been Investigated by the Mokpo Branch Office of Fisheries research and development agency from 1980 to 1983 and by myself from June 1984 to April 1955. 1) The annual variation of air temperature of the Mokpo coastal area is more severe than that of the Jodo coastal area, because the Mokpo coastal area is near to a large land area and is much influenced by the atmosphere. 2) But water temperature is less varied than air temperature. However water temperature is such an important medium that it has much to do with salinity, chemical oxygen demand, dissolved oxygen, and PO_4-P. 3) Influenced by a monsoons, the average precipitation is higher in summer than in spring or autumn, and precipitation in much concerned with water temperature, chemical oxygen demand, dissolved oxygen, salinity and PO_4-P. 4) The difference of salinity concentration is little varied between the coastal area of Mokpo and Jodo island, but that of the coastal area of Jodo island is a little higher than that of Mokpo coastal. AIso, it is lower is summer than in winter, probably because of precipitation. The indication of its reciprocal relation between its concentration and precipitation ranges from -0.70 to -0.81 and dissolved oxygen represents from 0.42 to 0.80. 5) The sea water transparency of the Jodo coastal area is higher than that of Mokpo coastal area, and lower in winter than in summer. Perhaps partly because of the fast ebb and flow and monsoons from the NW, and partly because of the shallow Mokpo coastal waters and its mud flot. 6) Chemical oxygen demand is greater in the Mokpo coastal area than in the Jodo coastal area and is smaller in winter than in summer. The indication of its reciprocal relation with precipitation ranges from 0.75 to 0.97. 7) The variation of dissolved oxygen is greater in the Mokpo coastal area than on the Jodo coastal area, probably because of water temperature and precipitation. The indication of its reciprocal relation with water temperature ranges from -0.89 to -0.99 and with precipitation ranges from -0.63 to -0.79. 8) Nitrite (NO_2-N) concentration is greater in the Mokpo coastal area than in the Jodo coastal area, and greater in winter than in summer. This may result from precipitation. PO_4~P is greater in the Mokpo coastal area than in the Jodo coastal area, and greater in winter than in summer. This may result from water temperature and precipitation. The indication of its reciprocal relation with water temperature ranges from -0.41 to - 0.80.

견/합성섬유 혼방품의 1욕염색(Ⅶ) : 견/아크릴로니트릴 섬유 혼방품의 염색거동 Adsorption Behavior of Silk/Acrylonitrile Fiber

金公朱,김경수,전재홍,이화선 全北大學校 1995 論文集 Vol.40 No.-

In one bath dyeing system of silk/acrylonitrile(acryl) fabric with acid/disperse dyes and acid/cation dyes, adsorption behavior of acid dyes, disperse dyes and cation dyes on silk and acryl fabrics were examined. In the dyeing of acryl with the C. I. Disperse Red 19(Red 19) and The C. I. Disperse Red 60(Red 60), dye uptake with Red 19 was higher than that with Red 60. When the silk and acryl fabric were dyed with C. I. Basic Red 27(Red 27), dye uptake on the acryl was higher than that on the silk. When the silk/acryl fabric was dyed with Red 19 and Basic 27, solid shade could be obtained with Red 19 but could not be obtained with Basic 27. In the dyeing of silk/acryl fabric dyed with Blue 80/Red 27 and C. I. Acid Blue 113(Blue 113)/C. I. Basic Blue 116(Blue 116), compatibility could be obtained with Blue 80/Red 27 but that could not be obtained with Blue 113/Blue 116.

폴리우레탄섬유의 加工條件이 收縮率에 미치는 影響

朴炳基,金公朱,任珍模 全北大學校 1981 論文集 Vol.23 No.-

Polyurethane has several advantages in stretch fabric applications and it's use has now expanded into many other knitting area. Elasticity and recovery from stretch are the most important properties of polyurethane fiber. So, it is the purpose of this paper to find out the shrinking effect under various conditions of treatments.

철봉 몸펴 앞돌아 물구나무서기 동작의 운동학적 분석

이종락,김혜영,김공주,김대근 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1

국제 체조 연맹이 정하는 자유 종목에서는 채점 규정상 B난도에 해당된다. 국가 대표 선수 3명을 대상으로 경기력 향상을 위한 기초 자료를 제공하고자 철봉 몸펴 앞돌아 물구나무서기 동작에 대한 보다 정확한 과정을 모색하고 좀더 발전적이고 변형된 기술 습득을 위한 운동학적 변인을 분석하였다. 1. 제 2 구간에서는 신체중심의 수직속도를 증가시키고 Bar에 가깝게 신체를 회전시킴으로 안정된 자세 동작을 수행하는 것이 바람직한 것으로 나타났다. 2. 제 3 구간에서는 신체중심의 수평속도를 빠르게 하고 견관절, 슬관절을 굴곡시켜 회전력을 증가시키는 것이 중요한 요인으로 나타났다. 3. 제 5 구간에서는 수평위치를 회전축인 Bar로부터 회전반경의 길이를 길게 하여 회전력을 상승시키고 견관절의 굴곡을 크게하고 신체를 layout시켜 다음 Swing동작의 준비를 여유있게 하는 것이 중요한 것으로 나타났다. 이상을 종합해보면 철봉 몸펴 앞돌아 물구나무서기 연기 동작을 수행하는데 제 2 구간에서 신체중심의 수직속도를 증가시키고 제 3구간에서 회전반경을 짧게하여 회전력을 높이고 제 5 구간에서 수직상승운동을 위치에너지로 바꾸는 것이 동작을 성공적으로 연기할 수 있는 중요한 요인임을 알 수 있다. This study has researched on the motion of ´the free hip circle forward to handstand motion on the horizontal bar´ as performed by the three national representative champion as its object for the purpose to present fundamental data for the improvement of competitiveness, in such a manner as to seek a more accurate progress and a more evolved and transformed skill to be attained, based on the kinematic factors as analysed below. 1. At phase 1, it was shown to be desirable to take a short rotation radius with enough room when shortening composite location of physical center, slowing down both in a little flexion. 2. It was also desirable at phase 2 that the vertical speed of the physical center should be increased; motion should be performed in a stable posture by shortening the front of moment, rotating the body closely to the bar when doing down rotation. 3. Phase 2 has revealed it to be an important factor to increase the rotation force by quickening both the vertical and horizontal speeds of the physical center and flexing the shoulders and knees. 4. Phase 4 indicated the rotation force should be raised and the vertical speed of vertical uprising should be used by flexing the shoulders and making the physical center close to the bar from the rotation axis. 5. It was important, as phase 5, that the composite location should shorten the length of rotation radius from the bar, which is the rotation axis so as to accelerate the rotation force and enlarge the flexion of the shoulders, lay out the body, and then prepare for the swinging motion in good allowance. To summarize the forerunning aspects, in the performance motion of the free hip circle forward to handstand motion on the horizontal bar for a more advanced, transformed, improved skill, motion, and competitive force, it was learned to be an important factor that the body-centered vertical speed should be increased at phase 1 and 2; the rotation force should be accelerated by reducing the rotation radius at phase 3; and the vertical uprising motion should be changed into the location energy at phase 5. These appeared as important factors for successful performance.

Blockade of Airway Inflammation by Kaempferol via Disturbing Tyk-STAT Signaling in Airway Epithelial Cells and in Asthmatic Mice

Gong, Ju-Hyun,Shin, Daekeun,Han, Seon-Young,Park, Sin-Hye,Kang, Min-Kyung,Kim, Jung-Lye,Kang, Young-Hee Hindawi Publishing Corporation 2013 Evidence-based Complementary and Alternative Medic Vol.2013 No.-

<P>Asthma is characterized by bronchial inflammation causing increased airway hyperresponsiveness and eosinophilia. The interaction between airway epithelium and inflammatory mediators plays a key role in the asthmatic pathogenesis. The <I>in vitro</I> study elucidated inhibitory effects of kaempferol, a flavonoid found in apples and many berries, on inflammation in human airway epithelial BEAS-2B cells. Nontoxic kaempferol at ≤20 <I><I>μ</I></I>M suppressed the LPS-induced IL-8 production through the TLR4 activation, inhibiting eotaxin-1 induction. The <I>in vivo</I> study explored the demoting effects of kaempferol on asthmatic inflammation in BALB/c mice sensitized with ovalbumin (OVA). Mouse macrophage inflammatory protein-2 production and CXCR2 expression were upregulated in OVA-challenged mice, which was attenuated by oral administration of ≥10 mg/kg kaempferol. Kaempferol allayed the airway tissue levels of eotaxin-1 and eotaxin receptor CCR3 enhanced by OVA challenge. This study further explored the blockade of Tyk-STAT signaling by kaempferol in both LPS-stimulated BEAS-2B cells and OVA-challenged mice. LPS activated Tyk2 responsible for eotaxin-1 induction, while kaempferol dose-dependently inhibited LPS- or IL-8-inflamed Tyk2 activation. Similar inhibition of Tyk2 activation by kaempferol was observed in OVA-induced mice. Additionally, LPS stimulated the activation of STAT1/3 signaling concomitant with downregulated expression of Tyk-inhibiting SOCS3. In contrast, kaempferol encumbered STAT1/3 signaling with restoration of SOCS3 expression. Consistently, oral administration of kaempferol blocked STAT3 transactivation elevated by OVA challenge. These results demonstrate that kaempferol alleviated airway inflammation through modulating Tyk2-STAT1/3 signaling responsive to IL-8 in endotoxin-exposed airway epithelium and in asthmatic mice. Therefore, kaempferol may be a therapeutic agent targeting asthmatic diseases.</P>