기능성 고분자 막의 기체 투과 특성

홍인권,이승범,김원일 단국대학교 1998 論文集 Vol.32 No.-

The permeation of gases through polymer membranes at temperatures above their glass transition, generally occurs by a solution-diffusion mechanism. This mechanism obeys to affinity difference between polymeric materials and gas molecules, various technologies, such as copolymerization, impregnation and so on, have been researched to improve the affinity of polymeric material for the gases. In this study, permeability and selectivity for some gases were obtained from steady-state rates of gas permeation through silicone rubber membrane which is prepared by supercritical fluid extraction method. The permeation rates were measured by means of a permeability apparatus of the variable volume type. The permeability was increased generally with permeation temperature and pressure. Silicone rubber membrane exhibits a higher permeability to CO_2 than to O_2, N_2. This result probably reflects the relatively high solubility of CO_2 in silicone rubber membrane, which is due to the affinity of the CO_2 molecules to the silicone rubber membrane. Since the separation power of CO_2/N_2, CO_2/O_2 was more than 200, and 100, it is able to separate CO_2 from the air, and the optimum temperature and pressure was 55℃, 60㎝Hg respectively. In future, it is possible that the silicone rubber membrane can be used for separation or concentration of CO_2 through experiment for mixed gas separation.

기상으로 존재하는 유독성유기용매의 완전산화 메커니즘

홍인권,이승범 단국대학교 1999 산업기술연구 Vol.1 No.-

The deep oxidation mechanism of gaseous toxic organic solvents was studied on a Pt / γ-Al_2O_3 catalyst phase at temperature ranging from 200 to 350℃. An approach based on the Mars-van Krevelen rate model was used to correlate the results. The objective of this study was to depict the kinetic behavior of the platinum catalyst for deep oxidation of VOCs. The conversions of VOCs were increased as the inlet concentration was decreased and the reaction temperature was increased. The maximum deep conversion of MEK, benzene and toluene were 91.81%, 75.45% and 55.69% at 350℃, respectively. The k_3 constant increases with temperature faster than K_1 the constant, that is, the surface concentration of (VOCs…O) is higher than that of (O) at higher temperature according to the Mars-van Krevelen mechanism. Also, the oxidation activation energy of toluene was larger than MEK for toluene is aromatic compound which have stronger bonding energy. Therefore, the catalytic oxidation mechanism of VOCs with Mars-van Krevelen could be used as the basic data for industrial oxidation processes.

이전가격의 적정성 검토에 관한 사례 : 컴퓨터관련제품 판매업을 중심으로

홍승범 德成女子大學校 2000 德成女大論文集 Vol.31 No.-

This study analyzes the transfer price applied to product transactions between tested corporations and their related companies. This case study was prepared to provide materials that can be used to contribute the successful implementation of Korean transfer pricing rule issued in 1995 The transactional net margin method was used to determine whether the prices applied between the related party transactions under review were at arm's length. The TNM method used return on capital employed and operating margin as appropriate profit level indicators which were adjusted for differences in certain financial ratios between the comparable companies and tested party. This analysis determined that intercompany price charged between D corporation or CC corporation and its foreign related party satisfy the arm's length standard. Transfer price charged between Tcorporation and its foreign related party does not satisfy the arm's length standard. Tax authorities and law courts can use the results of this case study as benchmark data of transfer pricing and its auditing.

원료탄의 배합비율에 의한 활성탄의 기능성 향상

홍인권,김상철,김원일,이승범 단국대학교 1998 論文集 Vol.33 No.-

Adsorption characteristics of activated carbon were affected by raw materials and operating conditions. Coal based activated carbons were prepared in a rotary kiln type furnace and the pretreatment effect of raw materials for preparing activated carbon was investigated. Steam was employed in manufacturing process as an activation agent. Activation temperature affected the properties of activated carbon. The adsorption capacity, or iodine value was increased in te activation temperature range of 800 to 900℃, yet decreased at higher temperatures than 900℃. Then, the activation effect was analyzed in terms of the activated carbon(AC) yield. It was found that the optimum heating rate and steam amount were 2.9℃/min, and 1g steam/g coalㆍhr, respectively. Effect of coal blends on the preparation of activated carbon was examined. The developing patterns of pore structure were varied with mixing ratio. As the amount of anthracite coal was increased, AC yield increased but adsorption capacity decreased. Pore size and pore size distribution were examined by BET specific surface area analyzer. In the AC yield range of 30∼40%, prepared activated carbon has micropores of sizes below 30Å and iodine value was above 1,000㎡/g in the temperature range of 850∼900℃. Benzene adsorption capacity was similar to those of mixed and Fushun coal but MEK adsorption capacity was superior to that of functions mixed coal. We found that the activated carbon based on coal has comparable to those of commericial products.

稅法上 課稅時期에 관한 硏究

홍승범 德成女子大學校 1996 德成女大論文集 Vol.27 No.-

Timing in taxation affects economic transactions, resourses allocation and raises fairness issues. Two methods of determining the timing in taxation are accurual basis and cash basis. Current tax law of Korea uses right and liability determination basis. Right and liability determination basis lacks consistency and does not seem to consider fully economic effects of regulations. To study timing in taxation is a way of understanding of ecnomic effects of transations. Tax law should be revised carefully so that it reflect economic results of tax regulaions.

압력이 가해진 반응공정에서 BTX의 촉매산화 전환특성

홍인권,이승범 단국대학교 2000 論文集 Vol.35 No.-

Catalytic oxidation of benzene, toluene, and m-xylene (BTX) was carried out in high pressure tubular reactor packed with 0.5% Pt/γ-Al_2O_3 catalyst. The conversions of BTX were increased as the inlet concentration was decreased and the reaction temperature and the molar density of oxygen were increased. And the molar density of oxygen was increased with pressure. The maximum deep conversion of benzene, toluene and m-xylene were 92.1%, 66.0% and 57.5% at 350℃ and 136 atm, respectively. In this study, the many intermediates produced by the partial oxidation of BTX was detected from off-line samples.

經營統制시스템의 設計와 運用에 관한 硏究

홍승범 德成女子大學校 1996 德成女大論文集 Vol.25 No.-

Management control can be defined as the system which has rhythm and systematic characteristics. Environment of management control system consists of organization structure, organization culture, behavioral factors, organization rules. If management control system fails to adapt itself to environment, it is difficult for the system to be effective or efficient in achieving organization's objectives. The design and operation of management control system of a organization depends on organization's environment uncertainty, management style of top management.

이면성 및 도플러 심초음파도를 이용하여 진단한 선천성 거대 좌회선지-좌심실 관동맥루

진승원,박준철,이영중,유병현,박현옥,김용주,윤호중,김재형,홍순조,최규보,권종범,원용순,박건 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

콘크리트 교량 및 강교의 상시감시 시스템에 관한 연구(Ⅰ)

박승범,홍석주,이봉춘 忠南大學校 産業技術硏究所 1998 산업기술연구논문집 Vol.13 No.1

The construction of large scale civil and building structures which form the base of social economy has been grown greatly. As the increasing of aged and deteriorated structure, it is necessary to evaluate the safety of those structures. The deterioration, safety evaluation repair and rehabilitation are important problems in the construction area that every country faces. This paper presents the general information on how to conduct a data analysis of long-term monitoring system and evaluate the characteristics of surveying methods.

생쥐 안구에서 산화적 손상에 의한 superoxide dismutases와 metallothionein의 나이에 따른 유도의 차이

이홍영,이태범,안춘산,변익건,최석민,권대승,최철희 朝鮮大學校 附設 醫學硏究所 2003 The Medical Journal of Chosun University Vol.28 No.2

The basal levels and inducibility of superoxide dismutases (SODs; Mn-SOD and Cu/Zn-SOD) and metallothionein (MT) was investigated in the eyes of mice with age. Oxidative stress was induced by paraquat, an intracellular superoxide generator, in 1, 4, 8, and 12 months of age and then mRl\As of SODs and MT in the eyes were determined by RT-PCR assay. The basal level of Mn-SOD mRNA increased from 1 month to 8 months but decreased thereafter. Mn-SOD mRNA was induced by paraquat until 4 month but not after 8 months. On the other hand, the basal level of Cu/Zn-SOD mRNA decreased with age. Cu/Zn-SOD mRNA was not induced by paraquat until 4 months. The basal level of MT mRNA declined with age whereas its inducibility by paraquat was intact at all ages. Taken together, the results indicate that SODs and MT are differentially expressed and induced according to the age. It could be also implicated that failure in induction of Mn-SOD with age may be one of causative factors in the aging process whereas induction of Cu/Zn-SOD and MT may be one of important factors in defense against oxidative stress in the eyes. 서론: 최근 노화는 반응성 산소종에 의한 산화적 손상의 축적결과라는 설이 각광을 받고 있다. 노화과정에서 노화와 관련된 질병을 비교적 잘 나타내는 안구를 선정하고, 정상생쥐의 안구에서의 superoxide dismutases (SODs) 와 metallothionein (MT) 의 함량 뿐 아니라 산화성 스트레스를 유발하는 paraquat에 의한 SODs와 MT의 유도능과 나이와의 상호관계를 조사하여 이들의 노화과정에서의 역할을 규명하고자 하였다. 재료 및 방법 : 본 연구에서 1, 4, 8, 12개월된 정상생쥐의 안구에서 반응성 산소종 생성의 초기에 중요한 방어기전인 SODs mRNA와 hydroxy radical (OH·)에 의한 산화적 손상의 마지막 방어기전인 MT mRNA의 함량과 산화성 스트레스를 유발하는 paraquat에 의한 유도능을 역전사 중합효소 연쇄반응 (RT-PCR) 으로 조사하였다. 결과: 정상생쥐의 안구의 노화과정에서 Mn-SOD와 Cu/Zn-SOD, 그리고 MT mRNA의 항정상태 함량을 조사한 결과, Mn-SOD mRNA는 8개월까지는 증가하다가 12개월에서 감소하였으나, Cu/Zn-SOD mRNA는 나이와 함께 감소하였다. 그러나 MT mRNA 는 8개월까지는 감소하다가 12개월에서 약간 증가하였다. 산화성 스트레스를 유발하는 parraquat에 의하여 Mn-SOD mRNA는 1개월과 4개월에서만 유도되었고, Cu/Zn-SOD mRNA는 8개월과 12개월에서만 유도되었으며, MT mRNA는 관찰한 전 기간에서 유도되었다. 결론: 이상의 결과를 종합하면 SODs와 MT는 안구에서 나이에 따라 서로 다르게 발현되고 유도되는 것으로 생각되며, 노화과정에서 Mn-SOD유도의 이상이 노화의 원인이 되는 인자로 작용하고, 반면에 Cu/Zn-SOD와 MT의 정상적인 유도능이 산화적 스트레스에 대하여 방어역할을 하는 것으로 생각된다. 이와 같이 연령이 증가함에 따라 Mn-SOD, Cu-Zn-SOD, 및 MT의 발현과 유도능의 차이가 있게 되고, 그 결과 반응성 산소종에 의한 산화적 손상의 정도의 차이로 노화의 속도가 조절되지 않나 생각된다.