확산 화염 반응기에서의 TiO_2 입자생성 및 전달현상

최상근,김동주,김교선 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

We prepared the nano-sized TiO_2 particles by the diffusion flame reactor and investigated the effects of several process variables on the generation and transport properties of TiO_2 particle. As the length from the tip of diffusion flame reactor increases, the size of TiO_2 particle increases by the coagulation between particles. The structure of TiO_2 particles prepared is almost found to be anatase. It was found that the TiO_2 particle size depends more largely on the change of reactor temperature than on the change of inlet TiCl_4 concentration.

골다공증에 의한 압박 골절의 치료에 있어서 경피적 추세 성형술의 의의

최재영,윤승환,조준,문창택,장상근 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Percutaneous vertebroplasty has recently been introduced as a therapeutic alternative for the treatment of pain associated with osteoporotic compression fractures and performed popularly at a few centers by neurosurgeons. This technique allows marked pain relief through stabilization of microfractures and strengthening of weakened vertebral body. Authors retrospectively analyzed the clinical outcome of 100 patients with osteoporotic compression fractures for investigating the therapeutic effectiveness of percutaneous vertebroplasty. They were treated with vertebroplasty from April to August 1999. Plain X-ray of all patients showed osteoporotic compression fractures at more than one level.

大學卒業定員制의 實施에 따른 學生生活 指導方案에 關한 硏究

崔根爀,張忠根,李相祐,張鎭吉,張大熙 충남대학교 1982 學生生活硏究 Vol.10 No.1

Higher education in Korea is faced with a new situation since 1981 when the government implemented a college graduation quota system designed to broaden the opportunities for higher education, alleviate the problem of the students who fail the entrance examination, and improve the quality of college graduates. The change of the system has brought about several serious problems including how to supply enough faculty members, how to provide enough educational facilities, and how to cope with the huge increase in the number of students, 30% more than graduation quota. The greatest single problem resulting from the implementation of college graduation quota system is the psychological and emotional unease aroused among the students, because 30% of those students with unsatisfying results must be banished from college before their graduation. This study aims to find effective measures for student guidance that each of the colleges can implement to help students adjust to the changed circumstances. After objectively investigating the problems from the various educational environments, from the recent students' views of college, and from the psychological and emotional unease arising in them by the fear of failing to graduate from their college because of implementation of the graduation quota system, a survey was conducted by means of a questionnaire composed of 40 questions and by means of personal interviews, 5,903 students, who are influenced by the graduation quota system, attending 19 public and private universities and colleges selected throughout the country. The data obtained from this survey were statistically processed with the help of the C. N. U. Computer Center, and the ratios of the responses to each of the questions were analyzed and calculated according to the distinctions of the total, sex, region, and major. The conclusions that the interrelations among the variant factors from each of the questions which were surveyed, analyzed and arranged have suggested are as follows : 1. The original purpose of graduation quota system should continually be clarified and communicated to all students and a concrete, specialized guidance system should be established to guide the minority of the students (13%) who don't fully understand the basic properties of higher educational institutions. 2. The institutions should provide enough educational facilities and supply enough faculty memebers to solve the problem of accomodating the large numbers of students. At the same time, they should suggest how students should learn positively and effectively to gain an expert knowledge, and how professors should gain public confidence in grade evaluation. Accompanying those measures, the government should develop a good policy to expand and distribute job opportunities to college graduates. 3. The admission quota should be controlled depending on the rate of naturally failed students, and then the students' unease and suppression caused by excessive competition can be relieved. In addition, it is advisable that the banished students should be allowed to transfer to University of the Air without regard to their grades. 4. An education devised to let students have a sound sense and way of thinking should be accompanied by a guidance system which their seniors, parents and society take part in. 5. An atmosphere conducive to sweet and well-rounded friendship among classmates should be created, sound extra-curricular activities should be encouraged and the number of students and adviser professor is in charge of should be lessened to a reasonable number.

향토음식 인지도에 관한 실증적 연구 : 경남 하동군 지역을 중심으로 with respect to Hadong-Gun Area, Kyungsangnam-Do

최수근,이연정,박성수 한국식생활문화학회 2004 韓國食生活文化學會誌 Vol.19 No.3

Rather than focusing on the general recognition of the area and extensive preference about its native cuisine, this study carried out more practical examination on the recognition of the native cuisine by presenting the more detailed introduction of the native cuisine in Hadong area. The findings of this study can be used as basic materials to devise measures for the instillation and advertisement of Hadong area's image, the development and maintenance of its native cuisine benefiting the activation of the local economy, and the reestablishment of Hadong area's native cuisine culture. First, the overall recognition of Hadong area's native cuisine was low and more consumption needs to be boosted by merchandising its foods through the strengthening of recognition. Second, correlation between this area's native cuisine was revealed and tables need to be set and menus need to be organized with this correlation in mind. Basic materials for suggestion sale were garnered. Third, given that most outside tourists visit Hadong by word mouth of all the information sources available, it is highly likely that positive word of mouth through satisfaction with native cuisine will raise the overall recognition of the area. Fourth, precise subdivision market and target market need to be specified. Though the factors like economic costs and the time required cannot be overlooked in strengthening recognition, consistent advertisement to the middle-aged people who are over 40 and live in Kyungsang-Do area will contribute to the fast rise in the recognition of Hadong area's native cuisine, leading to the possibility of economic development in the process.

한국인 정신분열병 환자에서 Endothelial Nitric Oxide Synthase 유전자의 다형성

최명수,정상근,조광현,김달식,황익근 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.1

運動種目別로 본 PWC_(170)時에 發現되는 運動能力에 관한 比較硏究

최영근,김상국,김정주 경희대학교 체육대학 한국체육과학연구소 1984 體育學論文集 Vol.12 No.-

With two Gymnastics players, three Basketball players, four Baseball players, four Football players as the Subjects, this study was made in order to reveal the degree of Physical Work Capacity (PWC) 170 by measuring how Heart Rate would change when they run on the Treadmill. The Results are as following: 1. In max Heart Rate, Baseball players were the highest as 209.00±4.90 beats/min, Gymnastics players were 195.50±3.54 beats/min, Football players were 192.00 ± 7.02 beats/min and Basketball players were the lowest as 187.00 ± 8.89 beats/min. 2. In max Running time and Running distance, Football players were the highest, 11.66 ± 0.59 minutes as Running time, 2450.3 ± 151.28m as Running distance, Basketball players were 11.21 ± 1.73 minutes and 2358.9 ± 381.77m, Baseball players were 10.69 ± 0.47 minutes and 2256.9 ± 104.60m and Gymnastics Players were the lowest, 8.50 ± 0.03 minutes and 1721.80 ± 9.90m. 3. In Heart Rate increase while they run on Treadmill, it was totally the highest in Baseball players, and was appeared orderly in Gymnastics players, in Football players, and in Basketball players. % HR max was appeared generally that Gymnastics players were appeared the highest, and was appeared orderly Baseball players, Basketball players, Football players. 4. In Heart Rate change while the Recovery, the Basketball players were appeared generally low Heart Rate at the Sometime, and was appeared orderly Football players, Gymnastics players, Baseball players. % H.R. max, Basketball players was recovered the fastest speed. Within 4min recovery it was appeared quickly that was orderly Basketball players, Baseball players, and after 4min was appeared orderly Basketball players, Gymnastics players, Baseball players, Football players. 5. In PWC 170 test, Basketball players were appeared superior that 9.09 min in Running time and 1781.0m in Running distance, and 240m/min in load and 6% in slope. And next Football players were appeared 7.27 min in Running time, 1463.4m in Running distance, 220m/min in load, and 5% in slope, Gymnastics players were appeared 5.53 min in Running time, 968.0m in Running distance, 200m/min in load and 4% in slope. Baseball players were appeared inferior that was 12 min in Running time, 704.0m in Running distance, 200m/min in load, and 4% in slope.

2-Methylisoborneol(2-MIB)제거를 위한 산화 및 흡착공정의 특성

최근주,김상구,류동춘,신판세,손인식,오광중 한국환경과학회 2002 한국환경과학회지 Vol.11 No.3

One of the Musty and earthy smell compounds in raw water is generally attributed to 2-methylisoborneol (2-MIB). It is well known that activated carbon and oxidants such as O_3, ClO_2 are effective ways to control 2-MIB. In isotherm equilibrium experiments, 2-MIB in distilled water was much more adsorbed to the activated carbon(A/C) than raw water containing dissolved organic carbon (DOC). The Freundlich constants(k) of distilled water and raw water were 3.36 and 0.049, and 1/n values were 0.80 and 0.42, respectively. The 2-MIB residual rate were Y = e^(0.55_x)~ e^(-0.54_x) with Ozone(O_3) dose by 5 minutes contact time at the 241 and 353 ng/L initial concentrations. The 2-MIB residual rate were Y = e^(-0.32_X)~ e^(-0.35_X) with Chlorine dioxide(ClO_2) dose by 15 minutes contact time at the 89 and 249 ng/L initial concentrations. 2-MIB was decreased from 1911 ng/L to 569ng/L by post-ozonation(70%removal efficiency) and removal efficiencies of 2-MIB by the following 4 kinds Granular Activated Carbon(GAC) process such as coal base, coconut base, wood base and zeolite+carbon base were 95.8, 89.5, 88.4, and 93.7% respectively.

돼지 신장세포(PK15)의 이종이식 거부반응에 대한 재조합 IL-18의 영향

최연실,김은미,김영관,박상연,심정현,윤도영,강형식,명평근 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8

Various cytokines including IL-1β, IL-2, IL-4, IL-10, IL-12p40, IFN-r, and TNF-α have been recently reported to play important roles in both host and donor cell activations during xenotransplantation. Interleukin (IL)-18, a proinflammatory cytokine, can induce IL-4 and IL-13 production in T cells, NK cells, B cells, mast cells, and basophils. IL-18 has the capacity to stimulate innate immunity and both Th1-and Th2- mediated responses, but little is known to involve in the xenograft rejection. In order to investigate the role of IL-18 in xenograft rejection, we transplanted the pig kidney (PK15) cells to C57BL/6 mouse with or without intraperitoneal injection of mouse recombinatant IL-18, It was analyzed the population of T cell, B cell and NK cell in the mice transplanted with PK 15 cells and recombinant IL-18 by flow cytometry. We found that splenic CD3+ T cells were increased in mice injected PKl5 cells with recombinant IL-18. These results suggest that recombinant IL-18 is critical in the xenograft rejection by increasing T cell population of the recipients.

鐵筋콘크리트 土留構造物의 最適化에 關한 硏究

崔洪植,邊根周,李相旻 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.2

A mathematical model is formulated for the minimum cost design of reinforced concrete earth structures. The design variables are selected to be the depth and steel ratio in the retaining wall, and the depth, steel ratio and footing sizes in the isolated column footings. An elastic analysis is performed and resulting designs are based on both the ultimate strength theory and the elastic theory of concrete design. Constraint requirements are imposed to insure structural strength and side constraints. The resulting mathematical model is a nonlinear constrained optimization problem. The modified Lagrange Multiplier method is suggested as a satisfactory algorithm for the optimum design of the R.C. earth structures.

기제와 피부투과촉진제가 아포모르핀의 피부투과에 미치는 영향

최영근,최옥,김건남,박은석,지상철 한국약제학회 2003 Journal of Pharmaceutical Investigation Vol.33 No.2

In order to evaluate the effects of vehicles and penetration enhancers on skin permeation of apomorphine, the skin permeation rates of apomorphine from vehicles of different composition were determined using Franz diffusion cells fitted with excised rat skins. Solubility of apomorphine in various solvents was investigated to select a vehicle suitable for the percutaneous absorption of apomorphine. The solvents used were propylene glycol (PG), Transcutol^??, Labrasol^??, Labrafac hydro WL^??, Labrafil WL 2609 BS^?? and isopropyl alcohol. Even though permeation rates of apomorphine from each vehicle were low (0.08-0.36㎍/㎠/hr), the combination of PG and Labrafac^?? increased it significantly. The permeation rates of apomophine from PG/Labrafac^?? mixtures increased as the volume fraction of PG in the mixture increased. The maximum permeation rate of 18㎍/㎠/hr was achieved at 30% of PG, which decreased with further increase of PG fraction. A series of fatty acids, alcohols and monoterpenes were employed as penetration enhancers. Incorporation of each enhancer in the PG/Labrafac^?? (30:70) mixture at the level of 10% improved the skin permeation significantly. The highest permeation rate, 117㎍/㎠/hr, was attained with myristic acid.