액체 An-In, Al-Sn, Al-Ga 계합금의 열역학적 성질

이용근 대한금속재료학회(대한금속학회) 1970 대한금속·재료학회지 Vol.8 No.2

金屬溶液의 熱力學的性質은 冶金理論의 基礎를 이루우고 있으므로, Al冶金의 基礎的硏究로서, 液體 Al溶液의 熱力學的 硏究를 한 結果中에서 Al-In, Al-Sn 및 Al-Ga系에 대한 特性을 論한다. 濃淡電地에 의한 그 起電力을 全組成範圍에 선하여 各各 700℃에서 94℃, 680℃에서 860℃ 및 680℃에서 820℃의 溫度範團에서 測定하고, 이것에 의거하여 Al, In, Sn 및 Ga의 各系에 있어서의 活量과 다른 熱力學的性質을 算出하여, 그 結果를 考察하였다. 이 中에서 Al-In系에는 二液相이 있어서 그 範圍을 起電力의 測定値에서 決定하였다. Al-In系의 成分의 活量은 Raoult의 法則에서 크게 正으로 偏倚하고, 溫度가 높을 수록 Raoult의 法則에 接近하여, 二液相內에서는 組成에 關係 없이 定溫度에서는 일정한 活量을 나타낸다. Al-Sn系에서는 Raoult의 法則에서 상당히 正으로 偏倚하며, Al-Ga系에서는 상당히 잘 따르고 있다. 그리하여 Al-In系는 比正則溶液, Al-Sn系는 sub-regular solution 및 Al-Ga系는 regular solution에 가까움을 알 수 있었다. 이 系들의 無限稀溥溶液에서의 活量係數는 γ˚은 Al-In系는 700℃에서 Al, In 各各 11.3, 13.2이며, Al-Sn系에서는 800℃에서 各各 4.05, 7, 11 및 Al-Ga系에서는 700℃에서 各各 1.15, 1.27을 얻었다. 한편 統計熱力學으로도 model 을 適用하여, 古典熱力學에 의한 結果와 比較考察하였다. 즉 Al-In系에 대해서는 model과 二液相境界線을 써서 活量을 算出하고, Al-Sn, Al-Ga의 兩系에 대해서는 各系의 熱力學的 過剩量을 算出하였다. 그리고 quasi-chemical의 近似式을 써서 3系에 있어서의 原子相互作用 energy와 short-range order parameter를 算出하고, 또 3系에 있어서의 各成分間의 self-interaction parameter도 算出해서, 이것들의 系의 巨視的性質과 微視的性質을 比較考察하여 서로 一致함을 알았다.

글로벌 로지스틱스상 화물추적 및 조회서비스 제고방안

이용근,박종석 한국국제상학회 2003 國際商學 Vol.18 No.1

global logistics is to efficiently execute a global supply chain and to provide the real-time status information on global movements of inbound and outbound goods to supply chain planning systems. to optimize the global network of businesses, all e-logistics services should be effectively carried out by one or more global logistics providers. value-added logistics services such as cargo tracking and tracing play an important role in the e-logistics services. there are two main questions global logistics companies need to address in approaching cargo tracking and tracing services in proactive manner : how to collect cargo flow data properly and how to translate the data to customers effectively. this paper includes both theoretical information of automatic cargo data capture and application profiles. the technology of automatic cargo data capture includes RFID and GPS/GIS. these technologies have the potential to significantly alter how processes occur and how companies operate. also, this study intends to construst and intergrate cargo tracking and tracing system in the global logisics information system.

고선량 방사선 조사후 치아수복재의 특성변화

이용근,이건일,이성재,박수아,허정무 원광대학교 생체재료·매식연구소 1996 원광생체재료·매식 Vol.5 No.2

To investigate the effect of high dose irradiation on the Vickers hardness number(VHN), color change and wear rate of dental filling materials, esthetic filling material specimens were studied. Six kinds of composite resins and two kinds of glass ionomers(GI) were used. One(CLF) was chemically cured composite resin, and five(HCX, HPL, PHB, POF, PRT and RZI) were light cured composite resins. One(FJT) of GI was chemically cured GI and one(FLC) was light cured GI. The filling material specimens were made according to the manufacture's instructions and were finally polished with Microcloth(Buehler). Half of the specimens were irradiated with 100 Gy radiation using a linear accelerator(Mitsubishi, 6 MV). VHN and CIELAB color were measured before and after irradiation, and wear test were performed for nonirradiated specimens by brushing with toothpaste, From the experiment , the following results were obtained. 1. The CIELAB color difference was significantly different depending on the material(p<0.01), and FLC showed the highest color difference (CIELAB ΔE) of 9.452 and CLF showed the lowest value of 3.642. 2. The VHNs of nonirradiated specimens were 12.22∼73.58 and those of irradiated specimens were 25.53∼84.53. The VHNs of irradiated specimens were significantly higher than those of nonirradiated specimens(p<0.05) except RZI, FJT and FLC. 3. The wear rate of irradiated specimens of RZI, FLC were significantly lower than those of nonirradiated specimens(p<0.05). 4. The color difference after brushing of irradiated specimens were higher than those of nonirradiated specimens except CLF.

킬레이트樹脂의 分析化學的應用(第1報) : 檢知管에 의한 微量 水銀이온의 簡易迅速定量法 A SIMPLIFIED RAPID DETERMINATION OF MERCURIC ION USING CHELATING RESIN DETECTOR TUBE

李龍根 연세대학교 대학원 1974 延世論叢 Vol.11 No.1

The concentration of mercuric ion was determined simply and rapidly using chelating resin decector tube. The procedure was as follows: One gram of the low cross-linked styrene-divinylbenzene copolymer (2% divinylbenzene), which had been previously dried at 100℃, was soaked with 10ml of 0.01% dithizone-monochlorobenzene solution for 3 hours in a refrigerator. The excess solvent was removed from the green gel beads by centrifugation, then the green gel beads were suspended in 1% aqueous zinc sulfate solution to convert them into the pink zinc-dithizonate gel beads which are more stable chelating resin. A detector glass tube (2.5mm ×120mm) was packed with the above chelating resin preparation and the packed tube was used for mercuric ion determination. When mercuric nitrate solution, pH of which was adjusted to 1 With nitric acid, was parsed through the column, the original pink color of chelating resin changed to orange from the top of the column. It was found in this study that the length of the color band was proportional to mercuric ion concentration. When 20 ml of aqueous solution containing a known amount of mercuric ion, which had been previously saturated with monochlorobenzene, was passed through the detector tube at the flow rate of 1 ml/min, 0.1∼0.8 ppm of mercuric ion can be determined successfully. The relative error of the determination was found to be ±5.5%. It was realized that the precence of Cu2+, Ag+ and Cl- in the sample solution affected the length of color band considerably. The chelating resin can be stored freshly for a couple of weeks in a refrigerator. Mercuric dithizonate complex can be washed out from the polymer beads when organic such as methyl ethyl ketone was flowed into the detector tube, and then the used chelating resin can also be recovered. The present process may be useful in the selective concentration of mercuric ion from the very dilute aqueous solution. Accordingly, this technique might be one of the useful methods to eliminate mercuric ion from industrial waste water.

종양세포 사멸을 위한 세라믹 발열소자의 개발

이용근,이상배,김연웅,김경남,오승한,최세영,이규호,김철성,심인보 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.5

알지네이트 인상재의 하중속도와 혼수비에 따른 압축특성의 변화

이용근 원광대학교 생체재료·매식연구소 1977 원광생체재료·매식 Vol.6 No.1

Information on viscoelastic properties of elastic impression materials are not sufficiently understood by the practitioners. In literature, this is referred to in general terms, and is stated that 'The removal of an impression from the mouth presents some problems that cell for special physical properties in an impression material' In this study, changes of elastic modulus, compressive strength and percent compression at maximum load of alginate impression materials were determined as the loading rate or powder-water ratio changed. And correlation between compressive mechanical properties and the loading rate or powder-water ratio was analyzed. Three kinds of alginate impression materials were studied, and the rate of loading was 10, 25, 50 or 100 mm/min. and the power-water ratio was from standard(100%) to 225% of standard. The results were as follows : 1. Brand of alginate impression materials, the loading rate and powder-water ratio significantly influenced on the elastic modulus, compressive strength and percent compression at maximum load(p<0.05). 2. Elastic modulus and compressive strength of alginate impression materials generally increased as the loading rate increased, and in some cases those properties increased significantly in higher rate of loading(p<0.05). 3. There was a statistically correlation between the loading rate and each of the three measured mechanical properties(p<0.01), and the correlation coefficient was in the range of 0.1384∼0.1653. 4. There was a statistically significant correlation between the powder-water ratio and each of the three measured mechanical properties(p<0.01), and the correlation coefficient was in the range of 0.5953∼0.6736.

熔融알루미늄合金系의 熱力學的 性質과 各種 物理化學的 性質과의 關係

李容根 전북대학교 공업기술연구소 1979 工學硏究 Vol.9 No.-

高速度鋼 直接製鋼法에 關하여

李容根 全北大學校 1957 論文集 Vol.1 No.-

Atmospheric Temporal Variations in the Pre-Landfall Environment of Typhoon Nangka (2015) Observed by the Himawari-8 AHI

이용근,Jun Li,Zhenglong Li,Timothy Schmit 한국기상학회 2017 Asia-Pacific Journal of Atmospheric Sciences Vol.53 No.4

The next generation Geostationary Operational Environmental Satellite-R series (GOES-R) Advanced Baseline Imager (ABI) legacy atmospheric profile (LAP) retrieval algorithm is applied to the Advanced Himawari Imager (AHI) radiance measurements from the Himawari-8 satellite. Derived products included atmospheric temperature/moisture profiles, total precipitable water (TPW), and atmospheric stability indices. Since both AHI and ABI have 9 similar infrared bands, the GOES-R ABI LAP retrieval algorithm can be applied to the AHI measurements with minimal modifications. With the capability of frequent (10-min interval) full disk observations over the East Asia and Western Pacific regions, the AHI measurements are used to investigate the atmospheric temporal variation in the pre-landfall environment for typhoon Nangka (2015). Before its landfall over Japan, heavy rainfalls from Nangka occurred over the southern region of Honshu Island. During the pre-landfall period, the trends of the AHI LAP products indicated the development of the atmospheric environment favorable for heavy rainfall. Even though, the AHI LAP products are generated only in the clear skies, the 10-minute interval AHI measurements provide detailed information on the pre-landfall environment for typhoon Nangka. This study shows the capability of the AHI radiance measurements, together with the derived products, for depicting the detailed temporal features of the pre-landfall environment of a typhoon, which may also be possible for hurricanes and storms with ABI on the GOES-R satellite.

三元系合金의 熱力學的 性質

李容根 전북대학교 공업기술연구소 1978 工學硏究 Vol.8 No.-

In the process of metal refining or alloy making, the behaviour of the atom of each element in the molten charge or alloy is very complex depending on the interaction between the atoms of the elements. In this paper, to clarify the properties of the liquid ternary alloy systems, Darken's and Schuh-mann's methods were introduced and applied to the liquid ternary Al-Sn-Ga and Al-In-Sn systems for the calculation of the excess quantities of the free energy, enthalpy and entropy of mixing, and also, the activities of the each component and the interaction parameters of the astoms in the Al-Sn-Ga system were derived.