솔-젤법을 이용한 aminoalkoxysilane 산소차단필름의 제조

김현준,Kim, Hyun-Joon 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.3

The oxygen barrier films were formed on poly(ethylene terephthalate) (PET) substrate by a sol-gel process using aminoalkoxysilanes. The coating layers were characterized by FT-IR and SEM. The oxygen permeability coefficients of coating films were measured by variable volume method, and then the influences of solvent ratio in sol and film drying temperature on the oxygen barrier properties were investigated. The aminoalkoxysilane coating films exhibited much higher oxygen barrier properties than PET film. The oxygen permeability coefficient of the film coated with each of APTEOS and APTMOS was measured to be $2.96{\times}10^{-6}$ and $3.05{\times}10^{-5}\;GPU$, respectively, while that of PET film was $1.16{\times}10^{-4}\;GPU$.

셀롤로오스 분리막을 통한 순수 이산화탄소 메탄 및 혼합기체의 투과 특성 연구

김현준,김홍일,강용수,홍석인 ( Hyun Joon Kim,Hong Il Kim,Yong Soo Kang,Suk In Hong ) 한국공업화학회 1996 공업화학 Vol.7 No.4

Cellulose acetate(CA) 비대칭막, CA 복합막 그리고 cellulose triacetate(CTA) 비대칭막을 통한 순수 이산화탄소 및 메탄의 투과 특성을 측정하여, 투과성능의 운전압력에 대한 영향을 조사하였다. 그리고 이산화탄소와 메탄의 혼합기체(CO ₂/CH₄=57.6/42.4)에 대한 투과 특성을 조사하여, 이를 순수 기체의 투과 특성으로부터 얻어진 결과와 비교하였다. 실험은 25∼125 psig의 분압과 상온에서 실험하였다. CA 복합막과 CTA 막을 통한 기체의 투과거동은 CA 막의 투과거동과 비슷하였다. CA 막, CA 복합막 그리고 CTA 막을 통한 순수 이산화탄소의 투과속도는 상부분압이 증가함에 따라 약간 증가하였으며, 반면에 메탄의 경우에는 상부분압에 의존하지 않고 일정하였다. 그러나 혼합기체의 경우 이산화탄소에 의한 가소화 효과와 각 기체의 경쟁효과에 의해 순수 기체와는 다른 투과거동을 보였다. 각각의 분리막의 투과성능을 비교할 때, CTA 막의 분리인자와 투과속도가 CA 막의 값들보다 높은 값을 나타내었으며, CA 복합막의 투과속도가 CA 막의 값보다 높은 값을 가졌다. 그러나 CTA 막의 경우 기계적 강도가 매우 낮았다. 결국 본 연구에 사용된 CA 복합막이 투과플럭스가 크므로 이산화탄소와 메탄의 분리용 막으로 적합하다고 생각된다. The permeation characteristics were investigated for pure carbon dioxide and methane through asymmetric cellulose acetate(CA) membrane, composite cellulose acetate membrane and asymmetric cellulose triacelate(CTA) membrane. In particular, the effect of operating pressure on the permeation performance was examined. And the permeation behavior for a mixture of carbon dioxide and methane (CO₂/CH₄=57.6/42.4) was also investigated and compared to the characteristics obtained from pure gases. The experiments were run at the range of partial pressure from 25 to 125 psig, and room temperature. The permeation behaviors of the CA composite and CTA membrane were similiar to those of the CA membrane. The permeation rates of pure carbon dioxide for CA, CA composite and CTA membrane were increased slightly with an increase in upstream partial pressure, while in the case of pure methane they were independent of upstream partial pressure. For a binary mixture of carbon dioxide and methane, abnormal permeation behaviors were observed due to the plasticization of carbon dioxide and the competition effect of each gas. The separation factor and permeation rate for CTA membrane were found to be higher than those for CA membrane, but the mechanical strength of CTA membrane was very poor. and the permeation rate for CA composite membrane was higher than that for CA membrane. Consequently, it can be said that the CA composite membrane is a strong candidate for the separation of CH₄and CO₂

물 분자막의 두께와 윤활특성의 상관관계에 대한 분자시뮬레이션 연구

김현준,허세곤,Kim, Hyun-Joon,Heo, Segon 한국트라이볼로지학회 2022 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.38 No.5

This paper presents a numerical investigation of the influence of water molecule thickness on frictional behavior at the nanoscale using molecular dynamics simulation. Three different models, comprising water thin films of various thicknesses, were built, and indentation and sliding simulations were performed using the models. Various normal loads were applied by indenting the Si tip on the water film for the sliding simulation to evaluate the interplay between the water thin film thickness and the normal load. The results of the simulations showed that the friction force generally increased with respect to the normal load and thickness of the water thin film. The friction coefficient varied with respect to the normal load and the water film thickness. The friction coefficient was the smallest under a moderate normal force and increased with decreasing or increasing normal loads. As the water film became thicker, the contact area between the tip and water film became larger. Under well-lubricated conditions, the friction force was proportional to the contact area regardless of the water film thickness. As the normal force increased above a critical condition, the water molecules beneath the Si tip spread out; thus, the film could not provide lubrication. Consequently, the substrate was permanently deformed by direct contact with the Si tip, while the friction force and friction coefficient significantly increased. The results suggest that a thin water film can effectively reduce friction under relatively low normal load and contact pressure conditions. In addition, the contact area between the contacting surfaces dominates the friction force.

전장축소형 무화염 소염기 형상설계 연구

김현준,이준호,채제욱,이성배,김인우,Kim, Hyun-Jun,Lee, Joon-Ho,Chae, Je-Wook,Lee, Sung-Bae,Kim, In-Woo 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6

This paper includes that there are results of designing the flash hider and analyzing fluid dynamics of a front area of the barrel to shorten the length of small arms. Generally, the muzzle flash can be generated out of the barrel by the reaction between the oxygen in the air and unburned gunpowder contained in the propellant gas if a barrel is not long enough to burn gunpowder fully inside of the barrel. Though, the hugh muzzle flash, which is a characteristic of small arms with short barrel length, caused a soldier to aim at the target at night by making the soldier blind for a while and endangers his life by revealing firing position to enemies. Besides, the heat of muzzle flash can weaken the performance of thermal sights, which are attached to small arms for night battlefield. In this paper, flash hiders with several different shapes were designed for a newly developed 5.56mm caliber rifle with short barrel length. The performance of each flash hider to reduce the muzzle flash was compared theoretically and experimentally. Through the authorized test procedure, a highly efficient design of flash hider for reducing the muzzle flash was identified. The result of the paper can be helpful when designing flash hiders for small arms with short barrel length.

Metalloporphyrin 계 화합물을 포함한 Polysulfone 막에서의 산소의 촉진수송

김현준,신우철,유병수,홍석인 ( Hyun Joon Kim,Woo Chul Shin,Byung Soo Yu,Suk In Hong ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.5

The permeation characteristics of pure oxygen and nitrogen were examined through pure polysulfone(PSf) membrane and polysulfone(PSf) membranes containing the acidic electron-poor iron(II) porphyrin and cobalt(II) porphyrin complexes. 5,10,15,20-tetraikis(pentafluorophenyl)-21H,23H-porphine iron(II) complexes with fluoride and butyl ligands, [F_(20)-TPP]Fe-F and [F_(20)-TPP]Fe-Bu, and 5,10,15,20-tetrakis(pentafluorophenyl)-21H,23H-porphine cobalt(II) complex, [F_(20)-TPP] Co(II) were used as the synthetic oxygen carrieres. All permeation experiments were carried out at the range of pressure from 30 to 500 mmHg and at constant temperature, 25℃. It is shown that the ideal separation factors and oxygen permeabilities of PSf membranes containing carrier complexes were higher than those of the pure PSf membrane. The ideal separation factors of the PSf membrane containing [F_(20)-TPP]Fe-F were higher than those of the other membranes and the permeability coefficients of oxygen were the highest of the PSf membrane containing [F_(20)-TPP]Fe-Bu. The increase of oxygen permeability is due to the facilitated oxygen transport by fluoroiron porphyrins. And the nitrogen permeabilities of PSf membranes containing carrier complexes were also higher than those of the pure PSf membrane. The increase of nitrogen permeability is thought to be led by increasing the free volume of the membrane by the carrier substances. The solubility of oxygen and solubility selectivity were the highest of the membrane containing [F_(20)-TPP]Fe(II) with fluoride ligand of which the affinity with oxygen was the highest.

토양환경보전법상 정화책임의 공법적 검토

김현준(Hyun-Joon Kim) 강원대학교 비교법학연구소 2012 환경법과 정책 Vol.8 No.-

극 각피증

김현준 ( Hyun Joon Kim ),서영주 ( Young Ju Seo ),김철우 ( Chul Woo Kim ),조희진 ( Hee Jin Jo ),김광호 ( Kwang Ho Kim ),김광중 ( Kwang Joong Kim ) 대한피부과학회 2006 대한피부과학회지 Vol.44 No.2

비만여성의 규칙적인 운동과 운동 강도가 MDA와 SOD활성에 미치는 영향

김현준(Hyun Joon Kim),최종환(Jong Hwan Choi),김현주(Hyeon Ju Kim) 한국발육발달학회 2005 한국발육발달학회지 Vol.13 No.4

The purpose of this study was to investigate the effect of 12-week exercise program on the production of malondialdehyde and antioxidant enzymes in obese women produced by different exercise intensities. Seventeen volunteers(age=2l.78±1.09) were placed in 2 groups: obese group(OG, n=9) and normal group(NG, n=8). The subjects who joined this investigation were asked to participate in aerobic exercise and/or weight training program for 12 weeks. MDA and SOD were collected at rest, just after the submaximal exercise and the maximal exercise, and 30minutes after the cyde ergometer riding at the beginning and the end of the 12-weeks program For data analysis, mean and standard deviation scores were calculated and repeated-ANOVA(Duncan past-hoc test) were used. OG was significantly higher than NG on the MDA level(at HRmax100% and recovery before training and HRmax100% after the exercise. OG showed the significant decrease on the MDA level at the HRmax100% and 30 minutes following the 12 week exercise, whereas NG only showed the significant decrease on it at HRmax100%. Depending on different exercise intensities, while OG showed significant differences on the MDA level before and after the exercise, NG only showed the significant difference on it before the exercise. Before the exercise, OG was significantly lower than NG on the SOD activity at the HRmax100%. However, after the exercise, there was no significant difference. Both groups significantly activated on the SOD level at the rest and HRmax100% following the 12 week exercise. Depending on different exercise intensifies, CG didn`t show any difference on the SOD activity before and after the exercise. NG didn`t show any difference on the SOD activity before the exercise, but showed the significant difference on it after the exercise. This study implies that regular exercise may have good effects on MDA and antioxidants.

자발적 환경협약(自發的 環境協約)

김현준 ( Hyun Joon Kim ) 한국환경법학회 2007 環境法 硏究 Vol.29 No.1

Die vorliegende Arbeit befaßt sich mit den Umweltabsprachen. Unter Umweltabsprachen versteht man die dem Umweltschutz dienlichen Vereinbarungen zwischen Staat und Privaten, insbes. Industrie, die auf einem in Verhandlungen gewonnenen Konsens der Beteiligten beruhen. Das klassische Instrument des Umweltschutzes ist die ordnungsrechtliche Maßnahme, die in den anglo-sachsischen Landern als ``command and control`` genannt wird. Dieses auf dem einseitigen Zwangsmittel beruhende Instrument konnte oft das effektiven Umweltschutz nicht erzielen. Aus diesem Grund wurde das klassische ordnungsrechtliche Instrument durch andere Instrumente erganzt. Auch Umweltabsprachen sind als eine solche Alternative zuverstehen. Nach dem Modell des deutschen Umweltrechts unterscheidet man normvollziehende Umweltabsprache und normvertretende Umweltabsprache. Die neuerdings zwischen koreanischer Behorde und Industrie abgeschlossenen verschiedene Umweltabsprachen sind auch danach zu klassifizieren, wie man die entsprechenden Fallbeispielen in dieser Arbeit sieht. Hinzuzufugen waren eine neue Klassifizierung der Umweltabsprache, die bei der vorliegenden Arbeit vorgeschlagen wird. Danach ist Umweltabsprache auch erganzende Umweltabsprache (Complementary Voluntary Environmental Agreement) und kapazitatsbildende Umweltabsprache (Capacity Building Voluntary Environmental Agreement) zu unterscheiden. Umweltabsprachen konnen in verschiedenen Formen auftreten, als offentlich-rechtlicher Vertrag, als privatrechtlicher Vertrag, als informelle Absprache. Die genaue Einordnung hangt von dem konkreten Inhalt der jeweiligen Absprache ab. Wenn Absprachen keine rechtlich verbindlichen Verhaltenszusagen enthalten, sind sie als informelle Absprachen anzusehen. Sonst sind sie als Vertrage zu interpretieren. In Bezug auf die informellen Absprachen ist nicht zu verkennen, dass die Bedenken gegen diese Absprachen in der Literatur ausgefuhrt worden sind, wie etwa die Behauptung, dass die schnelle Problemlosung durch die informelle Absprache mit erheblichen rechtsstaatlichen Gefahrdungslagen erkauft wird. Ob dieses auf Kooperationsgedanke basierende Instrument das Vollzugsdefizit beim Umweltschutz belegen kann, wird sich noch erweisen mussen.

사회적 갈등의 해결을 위한 행정법적 과제

김현준 ( Hyun Joon Kim ) 한국법정책학회 2005 법과 정책연구 Vol.5 No.1