연마 다듬질 가공면의 표면 미세형상 평가에 관한 연구

조남규,김현국,권기환,한창수,안유민,이성환,박균명 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

This paper describes the statistical analysis techniques for the surface roughness assessment of polished surfaces. In experiments, the polishing process of the sample surfaces which are manufactured by ball end mill is consist of two steps; the cusp removal process and the surface finishing process. For the cusp removal process, the criterion of cusp removal was established from the power spectrum analysis to assess the change of the cusp removal rate. For the finishing process, the surface was polished by the rotational CBN tool and vibration wood tool. And the surface quality of polished surface was assessed using the functional parameters based on the statistical values of surface profiles. Consequently, the surface finish performance of the polished surface using the vibration wood tool was improved.

경남지역의 채소류와 화훼류 해충에 관한 조사

신현열,이동운,추호렬,박정규 경상대학교 농업생명과학연구원 2001 농업생명과학연구 Vol.35 No.-

본 연구는 1996년 경남지역 주요 채소류와 화훼류 작물에 발생하는 해충과 기타 주요 해로운 동물의 종류를 알아보기 위하여 수행하였다. 오이에서는 오이총채벌레와 꽃노랑총채벌레를 포함하여 7과 8속 10종이 확인되었으며, 양파에서는 알톡토기를 포함한 4과 4속 4종이 조사되었고, 배추에서는 배추좀나방과 담배거세미나방을 포함한 10과 13속 14종이 확인되었다. 거베라에서는 아메리카잎굴파리와 점박이응애, 담배거세미나방을 포함한 8과 8속 10종이, 글라디올러스에서는 명주달팽이와 민달팽이, 들민달팽이를 포함하여 6과 7속 8종이, 국화에서는 민달팽이와 꽃노랑총채벌레를 포함한 10과 13속 14종의 해충이 확인되었다. Insect pests were surveyed on the major vegetable and floricultural crops in Gyeongnam province in 1996. In addition, some other important animal pests were included in this survey. Ten species of 8 genera in 7 families including Thrips palmi and Frankliniella occidentalis were found from cucumber; 4 species of 4 genera in 4 families including Bourletiella hortensis from onion; 15 species of 14 genera in 11 families including Plutella xylostella and Spodoptera litura from Chinese cabbage; 10 species of 8 genera in 8 families including Liriomyza trifolii, Tetranychus urticae and S. litura from gerbera; 6 species of 7 genera in 8 families including Acusta despecta, Incilaria contusa and Deroceras varians from gladiolus; and 14 species of 13 genera in 10 families including I. contusa and F. occidentalis from chrysanthemum.

평면형 Bi-Sb 다중접합 열전변환기의 특성

이현철,유호종,김진섭,함성호,신장규,이종현,이정희,권성원,박세일 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

A planar Bi-Sb multijunction thermal converter for the precise measurements of ac voltage and current has been fabricated and its characteristics was discussed. In order to convert ac power into heat, a bifilar thin film Pt-heater, which could cancel its Thomson and Peltier effects, was prepared on the Si_(3)N_(4)/SiO_(2)/Si_(3)N_(4) diaphragm for the thermal isolation between heater and silicon substrate. To convert the temperature or the heat generated by the heater into dc voltage and current, hot and cold junctions of the Bi-Sb thermopile, which has a large difference in Seebeck coefficients, were formed on the dielectric diaphragm and the silicon substrate, respectively. The respective thermal sensitivity of the thermal converter with a bifilar heater was about 10.1 mV/mW and 14.8 mV/mW in the air and vacuum, which is about eight times higher than that of commercial 3-dimensional thermal converter. In the case of ac 2 V-input voltage, the ac-dc voltage transfer difference was about ±2.0 ppm, and in the case of ac 10 mA-input current, the ac-dc current transfer difference was about ± 0.6 ppm, in the frequency range from 10 Hz to 10 kHz.

蓄血證과 蓄水證의 病理에 關한 文獻的 考察

崔昇勳,安圭錫,文濬典,朴鐘鉉 대한동의병리학회 1994 동의생리병리학회지 Vol.9 No.1

연구배경 : 축혈증과 축수증은 태양표증이 풀리지 않아 邪熱이 안으로 들어가 형성된 양대병증으로 이들의 부위 및 병리에 대한 설명이 명확치 못한 점이 많다. 이에 축혈증과 축수증의 본래 의미를 검토하고 그것의 병리에 대해서 부위, 증상, 개체별 차이 및 측수ㆍ축혈증의 실질에 대해서 연구하고자 함. 연구방법 : 축혈증과 축수증에 관련된 조문 및 유사증에 관한 조문들을 가려서 역대 주가들의 주를 참고로 연구하였다. 축수ㆍ축혈의 실질에 관해서는 처방을 중심으로 사용된 약재들의 현대적 약리작용을 통해 연구하였다. 결과 : 축혈증은 하초소복부의 혈액순환계통의 질환과 관련된 것으로 나타났으며, 축수증은 방광자체의 문제이기 보다는 기화분리로 인한 수액대사 장애와 관련된 병증으로 볼 수 있다. Through the philological study on syndrome of stagnated blood & syndrome of stagnated water, the results are obtained as following; 1. It is resonable to understand that the location of Syndrome of Stagnated Blood(蓄血證) is the lower abdomen and Syndrome of Stagnated Waste (蓄水證) is not exactly the disorder of Gall Bladder itself, but the disturbance of waterbolism derived from the disturbance of Qi (氣) transformation. 2. Syndrome of Stagnated Blood is that, being uncured Taiyang Channel Syndrom (太陽病), pathogen enters inside and pathogenic heat combines with blood at the lower abdomen; its main signs are spasmatic distention or muscular rigidity of the lower abdomen, mental derangement and normal urination. 3. Syndrome of Stagnated Water is that, being uncured Taiyang Channel Syndrom, pathogenic heat enters inside and combines with water and leads to disturbance of waterbolism; its main signs are thirsty, dysphoria, and difficulty in urination. 4. In the view of Western Medicine, Syndrome of Stagnated Blood is related with the disease of the blood circulation-especially in microcirculation- of the lower abdomen; Syndrome of Stagnated Water is similar to the disease which is related with the abnomal state of osmotic density derived from the unblance of electrolytes. 5. Lee Je-Ma regared the Syndrome of Stagnated Blood as SinSooYeolPyoYeolByung(腎受熱表熱病) of ShaoYin-Ren (少陰人), so explained it as the disease derived from the lower abdominal accumulation of Yang-Qi (陽氣) which coudn't have ascended; and regarded the Syndrome of Stagnated Water as PiSooHanPyoHanByung (脾受寒表寒病) of ShaoYang-Ren (少陽人), so explained it as the disease derived from the accumulation of internal heat because of discending disturbance of Yin-Qi (陰氣).

The influence of the signal dynamics of activated form of IKK on NF-κB and anti-apoptotic gene expressions: A systems biology approach

Park, Sung Gyoo,Lee, Taehyung,Kang, Hee Yong,Park, Kunsoo,Cho, Kwang-Hyun,Jung, Guhung Elsevier 2006 FEBS letters Vol.580 No.3

<P><B>Abstract</B></P><P>NF-κB activation plays a crucial role in anti-apoptotic responses in response to the apoptotic signaling during tumor necrosis factor (TNF)-α stimulation. TNF-α induces apoptosis sensitive to the hepatitis B virus (HBV) infected cells, despite sustained NF-κB activation. Our results indicate that the HBV infection induces sustained NF-κB activation, in a manner similar to the TNF-α stimulation. However, these effects are not merely combined. Computational simulations show that the level of form of the IKK complex activated by phosphorylation (IKK-p) affects the dynamic pattern of NF-κB activation during TNF-α stimulation in the following ways: (i) the initial level of IKK-p determines the incremental change in IKK-p at the same level of TNF-α stimulation, (ii) the incremental change in IKK-p determines the amplitudes of active NF-κB oscillation, and (iii) the steady state level of IKK-p after the incremental change determines the period of active NF-κB oscillation. Based on experiments, we observed that the initial level of IKK-p was upregulated and the active NF-κB oscillation showed smaller amplitudes for a shorter period in HepG2.2.15 cells (HBV-producing cells) during TNF-α stimulation, as was indicated by the computational simulations. Furthermore, we found that during TNF-α stimulation, NF-κB-regulated anti-apoptotic genes were upregulated in HepG2 cells but were downregulated in HepG2.2.15 cells. Based on the previously mentioned results, we can conclude that the IKK-p-level changes induced by HBV infection modulate the dynamic pattern of active NF-κB and thereby could affect NF-κB-regulated anti-apoptotic gene expressions. Finally, we postulate that the sensitive apoptotic response of HBV-infected cells to TNF-α stimulation is governed by the dynamic patterns of active NF-κB based on IKK-p level changes.</P>

Triboelectrostatic separation of covering plastics in chopped waste electric wire

Park, Chul-Hyun,Jeon, Ho-Seok,Cho, Bong-Gyoo,Park, Jai-Koo Wiley Subscription Services, Inc., A Wiley Company 2007 Polymer engineering and science Vol.47 No.12

<P>To develop a triboelectrostatic separation technique for covering plastics in waste electric wire, process variables such as charger material, relative humidity, air velocity, electrode potential, and splitter position have been studied. Polypropylene was found to be the most effective material for a tribo-charger in the separation of cross-linked polyethylene (XLPE) and polyvinyl chloride (PVC). The charge density of XLPE and PVC was increased with deceasing relative humidity and increasing air velocity in the tribo-charger. The charge density of a 1:1 mixture of XLPE and PVC was determined to be higher than that of individual XLPE and PVC. A dominant charging mechanism in the tribo-charger with a 1:1 mixture of XLPE and PVC seems to be the charging of a combination of particle-particle and particle-charger surface. However, in case of individual plastics, the charging of particle-particle occurred. Over 98.05% PVC recovery with 99.50% grade was successfully obtained under the conditions of a splitter position of +2 cm from the center, 25 kV electrode potential and over 13 nC/g PVC charge density for the optimum triboelectrostatic separation. POLYM. ENG. SCI., 47:1975–1982, 2007. © 2007 Society of Plastics Engineers</P>

Characterizations and Applications of Lignin-based Carbon / Sepiolite Hybrid Materials

Hyun-gyoo ROH,Jungmin LEE,Soohee PARK,Hyeonjeong KANG,Myeong-uk KIM,Dahyun KIM,Juhee BYEON,Jongshin PARK 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2

Electrophysiological and behavioral studies on chemical communication of four tortricid species

Hyun Sik Roh,Chung Gyoo Park,Kye Chung Park 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04

Four sympatric tortricid (Lepidoptera) species in New Zealand, Epiphyas postvittana (Walker), Planotortrix octo (Dugdale), Cydia pomonella (L.), and Cydia succedana (Denis and Schiffermüller), were studied for the morphology of antennal sensilla and the chemical communication systems using scanning electron microscopy (SEM), electro-antennogram (EAG), gas chromatography-electroantenno-detection (GC-EAD), single sensillum recording (SSR) and field tests. Antennal flagella of adult have four main types of olfactory sensilla (s.); s. trichodea, s. basiconica, s. auricillica, and s. coeloconica in the four species. The s. trichodea subtype I was longest and male-specific in all the species. The antennae of males of the four species showed characteristic higher EAG, GC-EAD and SSR responses to 12, 14-carbon acetates or alcohol. Some of the selected chemicals selected from the electrophysiological experiments caused significant antagonistic or agonistic activities to the sex pheromone of each species in the field. In this study, the four species showed distinct chemical communication systems according to sub-family, which possibly serve as a factor in species isolation.

Induction of apoptosis by morusin in human non-small cell lung cancer cells by suppression of EGFR/STAT3 activation

Park, Hyun-Ji,Min, Tae-Rin,Chi, Gyoo-Yong,Choi, Yung-Hyun,Park, Shin-Hyung Elsevier 2018 Biochemical and biophysical research communication Vol.505 No.1

<P><B>Abstract</B></P> <P>This study was designed to validate the anticancer effects of morusin in human non-small cell lung cancer (NSCLC) cells. Morusin suppressed the cell growth and colony formation in a concentration-dependent manner in H1299, H460 and H292 cells. These anticancer activities were related with apoptosis induction proved by the accumulation of chromatin condensation, PARP cleavage, increase of sub-G1 phage and annexin V-positive cell population. Interestingly, signal transducer and activator of transcription 3 (STAT3) was dephosphorylated by morusin. Morusin suppressed the transcriptional activity of STAT3 and down-regulated the expression of STAT3 target genes. In addition, morusin inhibited the phosphorylation of epithelial growth factor receptor (EGFR), an upstream regulator of STAT3. The docking study showed that morusin directly binds to the tyrosine kinase domain of EGFR. Furthermore, the anticancer effects of morusin were consistently observed in erlotinib-resistant H1975 cells expressing L858R and T790 M mutant EGFR, suggesting that morusin can be used for the advanced NSCLC with acquired resistance to EGFR TKI. Taken together, our results demonstrate that morusin induced apoptosis in human NSCLC cells regardless of EGFR mutation status through inhibition of EGFR/STAT3 activation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Morusin suppressed the cell growth by induction of apoptosis in NSCLC cells. </LI> <LI> Morusin suppressed the activity of EGFR/STAT3 pathway in NSCLC cells. </LI> <LI> Docking study showed that morusin binds to the tyrosine kinase domain of EGFR. </LI> <LI> Morusin exhibited anticancer activities in EGFR TKI-resistant H1975 cells. </LI> </UL> </P>

Efficient stress-relaxation in InGaN/GaN light-emitting diodes using carbon nanotubes

Park, Ah Hyun,Seo, Tae Hoon,Chandramohan, S.,Lee, Gun Hee,Min, Kyung Hyun,Lee, Seula,Kim, Myung Jong,Hwang, Yong Gyoo,Suh, Eun-Kyung The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.37

<P>A facile method to facilitate epitaxial lateral overgrowth (ELO) of gallium nitride (GaN) was developed by using single-walled carbon nanotubes (SWCNTs). High-quality GaN was achieved on sapphire by simply coating the SWCNTs as an intermediate layer for stress and defect mitigation. SWCNTs maintained their integrity at high reaction temperature and led to suppression of edge dislocations and biaxial stress relaxation by up to 0.32 GPa in a GaN template layer. InGaN/GaN multi-quantum-well light-emitting diodes (LEDs) on this high-quality GaN template offered enhanced internal quantum efficiency and light output power with reduced efficiency droop. The method developed here has high potential to replace current ELO methods such as patterned sapphire substrates or buffer layers like SiO2 and SiNx.</P>