Heumann 法에 依한 Indigo 合成의 考察

林龍進,鄭鍾鉉 慶北大學校 1981 論文集 Vol.31 No.-

Indigo has been known as one of the oldest natural dyes and taken from the leaves of the plant called indigofera tinctoria and has been used as a blue pigment or vat dye for wool and cellulose fiber so far. Numerous methods have been proposed since Bayer's synthesis of indigo in 1870, but all of them present many difficulties in the practical operations. The method discovered by Heumann in 1890, consisted of the caustic soda fusion of alkali salt of phenylglycine-o-carboxylic acid to form indoxyl, which undergoes quantitative oxidation in alkaline solution to indigo, have been widely used, cormmercially until recently. But there are also many problems on the preparation of anthranilic acid. The oxidation process of phthalic amide to anthranilic acid is the most important stage in the Heumann process because the yield of anthranilic acid varies widely according to the reaction time and temperature. In this study, the effects of reaction time and temperature were discussed and the optimum conditions of the oxidation process were checked out, and then, on the preparation of indigo from anthranilic acid, the 2-step process, taking off the separation of phenylglycine-o-carboxylic acid, was attempted and compared with the normal process. The results show that the yield of anthranilic acid was increased with increasing of time and temperature of the reaction up to 60min., 72℃, and then decreased in contrast with the fact that common reactions maintain the constant value. The by-product which was separated from the filterate on the process of anthranilic acid preparation was identified with the phthalic acid formed by the unoxidation or over-oxidation. The yield of indigo prepared by 2-step process dropped a little compared with the normal process, but it seems to be very interesting in the commercial preparation of indigo.

Sr·페라이트의 자기특성에 관한 연구

임재근,서강수,문현욱,신용진 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-

This thesis is the study on the magnetic properties of strontium (Sr) ferrite. Specimens of SrO·nFe₂O₃,basic composition, with n=5.9 which is nonstoichiomatric composition region were prepared by sintering at 1275°C for 1hr, whthin air surroundings. In order to increase coercivity, additives of 0.4wt%SiO₂ and 0.7wt%CaCO₃ were added into basic composition, and 0.5wt%∼2.0wt%Cr₂O₃ was added as second additives. In case of second additives 1.5wt%Cr₂O₃, it was obtained uniformed grain size and magnetic properties was increased. The sintering temperature was 1150°C, 1180°C, 1210°C, 1240°C and 1270°C respectivily and cooling was performed in furnance. From the research and experiments on the magnetic properties of strontium (Sr) ferrite based on the complex additive technique, it was obtained good magnetic properties of (BH)mas=0.72MGOe, at the sintering temperature of 1210°C, in the case of (basic composition)+(basic additive)+(1.5wt%Cr₂O₃)

Improved Micropropagation of Root Chicory, Cichorium intybus L. var. sativus.

Lim,Jung-Dae,Yang,Deok-Chun,Lee,Hyeon-Yong,Kim,Jong-Dai,Lee,Jin-Ha,Sung,Eun-Soo,Yu Chang-Yeon 한국자원식물학회 2004 Plant Resources Vol.7 No.1

The establishment of an efficient protocol for plant regeneration and micropropagation from leaf explant cultures of Chicory, Cichorium intybus L. var. sativus. is reported. Callus formation rate appeared 100% from explant in all growth regulators, but calli formed in the prensence of naphthaleneacetic acid (NAA) were appeared very compact and non-embryogenic state. The regenerated shoots were obtained from leaf explant cultures on solid MS medium containing different concentrations of cytokinins and auxin. The highest number of shoots (5.7) per explant and shoot growth (2.8cm) was obtained on MS medium containing 0.1 mg BAP L^-1 and 0.1 mg NAA L^-1. Indole acetic acid was the most suitable auxin for root formation among three auxins tested. 2,4-D had no effect on shoot and root formation.

球狀黑鉛鑄鐵에 있어서 Sn添加 및 鑄物 두께에 關한 硏究

林奭原,朴龍鎭 弘益大學校 科學技術硏究所 1991 科學技術硏究論文集 Vol.1 No.-

아몰퍼스 리본에 의한 변위센서

임재근,강재덕,신용진 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-

In this thesis, we fabricate a zero-magnetostrictive amorphous ribbon, measure the impedance effect, and then investigate possibility to be used as a sensor material. Co72.5Fe5.5MoB15Si5 is used as composition of specimen alloy. We first melt the specimen in high frequency induction furnace and then rapidly quench it by using single roll technique. As the result, we obtain a ribbon where length=93㎜, thickness=12㎛ and width=1㎜. Consequently, it is proved through this study that zero-magnetostrictive amorphous ribbon can be used as an excellent magnetic sensor material.

치과용 합금의 부식성에 관한 연구

임범순,이용근,윤숙진,김철위 大韓齒科器材學會 1995 대한치과재료학회지 Vol.22 No.1

Corrosion of dental alloys in the oral cavity can affect the mechanical, esthetic properties and efficiency of metallic restorations, and has great influence upon the local and systemic health of patients. The purpose of this study was to clarify the corrosion behavior of various dental alloys, and to measure the galvanic currents between dissimilar alloys. Fifty-eight kinds of dental casting alloys such as twenty-nine high gold alloys, ten low gold alloys, fourteen silver-palladium alloys, five base metal alloys, and twenty kinds of ceramic alloys such as seventeen noble metal alloys, three base metal alloys, were used as the experimental alloys. Modified Fusayama's artificial saliva titrated to pH 6.7 with phosphoric acid was used as an electrolyte. The specimens were immersed in the modified artificial saliva of 37℃. The rest potentials, anodic polarization curves, corrosion potentials, and galvanic currents were measured by using the potentiostat / galvanostat and zero shunt ammeter. From the experiment, the following results were obtained : 1) The gold based alloys showed the high rest potentials and the low current densities within experimental potential range. 2) The rest potentials and the current densities of the palladium-based alloys were influenced by the content of platinum, palladium, and silver. 3) In the nickel-chromium base alloys, the formations of passivation film were influenced by chromium content. The copper-aluminum alloy showed very high current density which was more than 150 mV . 4) The corrosion potentials of ceramic alloys were lower than those of dental casting alloys, but the trend of anodic polarizations were generally similar to the other alloys. 5) The amount of galvanic current and the polarity in the bimetallic galvanic cell could not be predicted considering only the alloy composition. The galvanic current decreased while the measuring time passed, but flew continuously.

실대실험을 통한 신배수 시스템의 배수유동특성에 관한 실험적 연구

임수형,김용경,박률,박흥진,이정재 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

In this research, we propose a new system. The system aim for an adaptedness with buildings, freedom of plan, construction and renewal in water pipe equipments, etc. Because pumping pipe using gravity way by water is most popular method in drainage system. But, it is difficult to repair a drainpipe in this method because the drain pipe diameter is increased as using this method. Therefore, we must have a new concept to shorten the pipe diameter. The new system is not need of incline of piping, and it uses drainage power that is changed potential energy by high velocity flow as making Siphonage at vertical pipe. Therefore, the diameter of piping can decreased than existing piping system established in the ceiling. Also because connecting position will be located at the lower part, it is changed the potential energy of drainage to the high velocity flow. In addition. Drainage will be smooth because the fixture drain is linked by each drain piping.

耐熱性 合成樹脂에 關한 硏究 : Aromatic Polyamide의 合成과 耐熱性에 關하여

林龍進,金祐埴,민경은 慶北大學校 1974 論文集 Vol.18 No.-

Thermally stable polymer which does not lose weight rapidly up to about 400℃ was prepared from p-aminobenzoic acid by means of melt polymerization. The polymer was identified completely para oriented aromatic polyamide by analytical data. And some information obtained from synthetic process and thermal and/or chemical stability of these polymers was discussed.

Effect of Photoperiod, Temperature and True-leaf Stage in Bolting Rate of Chicory (Cichorium intybus L. var. sativus)

Lim,Jung-Dae,Seo,Jeong-Sik,Lee,Hyeon-Yong,Kim,Jong-Dai,Lee,Jin-Ha,Yu,Chang-Yeon 한국자원식물학회 2004 Plant Resources Vol.7 No.1

Root chicory (Cichorium intybus L. var. sativus) is potential alternative medicinal and sugar crop which accumulates a high amount of linear polyfructan, inulin in its roots. A problem in root production is that over-wintered stock plants often flower. Once the plant becomes reproductive, stem elongation and root growth slows and floral buds arise from every node, rendering the plants useless for propagation. The objectives of this research was to examine the effectiveness of manipulating environmental factors containing photoperiod, temperature and number of leaf states. The experiment was performed in growth chamber to create two photoperiods (8 h, and 16 h) with three temperature regimes (5℃/3℃, 10℃/8℃, and 15℃/13℃ day/night temperature) for a total of six treatments on three type of true-leaf stage of plant. Data of bolting rate, shoot and root length, shoot and fresh weight was invetigated in each treatments. This is the first report on changes in bolting rate and shoots and roots production during a whole growing season and differences in the effect of cold and photoperiod treatment depending on the true-leaf stage of plant.

중소기업 정보화 장애요인에 관한 연구

임기홍,전용진 한국생산성학회 2001 生産性論集 Vol.15 No.3

It is believed that using information technology is the best way to survive under the current business environment of small and medium-sized enterprises. The importance of using information technology is also emphasized in order for them to be successful and competitive companies in the world. Many small and medium-sized enterprises still have difficulties in using or building an efficient computerized information technology system. This study discusses the difficulties such as funds, technology, and human resources. Based on the discussions, it tries to analyze the relationships between the difficulties and organizations' characteristics or performances. It is believed that using information technology is the best way to survive under the current business environment of small and medium-sized enterprises. The importance of using information technology is also emphasized in order for them to be successful and competitive companies in the world. Many small and medium-sized enterprises still have difficulties in using or building an efficient computerized information technology system. This study discusses the difficulties such as funds, technology, and human resources. Based on the discussions, it tries to analyze the relationships between the difficulties and organizations' characteristics or performances.