연속파형 Nd:YAG 레이저에 의한 인코넬 600의 용접 공정변수의 연구

배신철,유영태,송성욱,신호준,나기대 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1

The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and deep penetration. Welding characteristics of Inconel 600 Alloy using a continuous wave Nd:YAG laser are experimentally investigated. The major process parameters studied in the present laser welding experiment were position of focus, laser power, travel speed. The gap and offset maintained as small as possible. Optical microscope were used to investigate the microstructures of the welded zone. The follow conclusions can be drawn the laser power and travel speed have a pronounced effect the fusion zone size and shape.

뉴로 퍼지를 이용한 무인 운송 장치의 제어

나영남,배상현 조선대학교 기초과학연구소 1997 自然科學硏究 Vol.20 No.1

The action base system; making AGV controller advance and learn to deal with Continuosly changed circumstance by itself on operating AGV is studied very actively. For the purpose of AGV's active and effective avoidance of obstacle and path planning, fuzzy neural network controller was used and in this study its efficiency is discussed.

靑色 사파이어의 熱處理와 分光學的 特性

나경주,김원사,김문영,배인국,장영남 충남대학교 기초과학연구소 1994 연구논문집 Vol.14 No.-

For the blue sapphires from Santung, China, the color change before and after has been investigated by UV-Visible spectrophotometry method. The blue sapphires from Shantung show four groups of absorption bands: the bands A (374, 386 and 450 ㎚) being attributed to single Fe^3+ ion, the band B (560, 579 and 704 ㎚) to Fe^2+/Ti^4+ pairs, the band C (∼800 ㎚) to Fe^2+/Fe^3+ pairs, and the D (528 ㎚) to Ti^3+ dd transitions. From those UV-VIS characteristics the origin of blue color of the sapphires is confirmed to be attributed by the factors such as Fe^2+/Fe^3+ and Ti^3+/Ti^4+. The absorption spectra of natural blue sapphires before and after heat treatment show distintive features, comparing with those of sapphires from other localities: the bands of 689 ㎚ and of Cr^3+ are not recorded on the spectra of sapphires from Shantung. The band (492 ㎚), which resulted from Ti^3+, is not shown and the intensity of the band 528 ㎚ decreases after the heat treatment. Decoloration of ink-blue sapphires are found to be successful by heat treatment with the control of annealing and atmosphere. During the diffusion process the excess components of impurities contained originally in the host crystal were expelled to the surface of crystals, enhancing the transparency of the crystals noticeably.

규산질 비료의 참외 흰가루병 발생 억제 효과

류나현,최미영,류연주,조현종,이용세,이영득,정종배 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4

토양에 시용한 규산의 참외 흰가루병에 대한 직접적인 억제 효과와 살균제의 방제 효과를 증진시킬 수 있는 보조효과를 조사하였다. 규산질 비료의 처리는 철가루병 균에 의해 감염된 참외 잎에서 균사의 생장과 분생포자의 형성을 억제함으로써 흰가루병 발생을 일부 억제할 수 있는 것으로 조사되었다. 물론 규산질 비료 자체만의 흰가루병 발생 억제 효과는 매우 미약한 수준이었으나 살균제의 흰가루병 방제 효과를 크게 증진시켜줄 수 있는 것으로 나타났다. 따라서 현재 농가 현장에서 밝혀지고 있는 규산질 비료의 참외 병해 발생 억제 효과는 주로 이러한 살균제의 효과를 증진시킬 수 있는 규산의 보조적인 작용에 기인하는 것으로 판단된다. 따라서 토양에 대한 적절한 수준의 규산질 비료의 시용은 살균제의 방제 효과 증진을 통하여 과다한 약제의 사용과 그에 따른 부작용을 경감시킬 수 있을 것으로 보인다. 규산질 비료의 흰가루병 발생 억제 효과를 증진시키기 위해서는 앞으로 병의 발생을 최대로 억제할 수 있는 참외 잎 중의 적정 규소 함량에 대한 검토 등의 추가적인 연구가 필요할 것이다. Silicon is known to accumulate in plants and results in greater resistance to diseases and insect pests. In this study, we investigated the effect of silicate fertUizer applied in soil on the development of powdery mildew of oriental melon Oriental melon seedlings of four-leaf stage were transplanted and grown in a plastic film house. silicate fertilizer was applied to maintain soil available SiO₂ level of 200 ㎎/㎏ one week before transplanting. Fungicide trinumizol was sprayed three times; one, two, and three weeks after transplanting. Sphaerotheca fuliginea was inoculated 2 weeks after transplanting. The number of infected leaf and the number of fungal colony in leaves were measured one, two, and three weeks after the inoculation. Three weeks after the fungal inoculation, in the treatment of fungicide triflwnhl, infected leaf numbem and number of colony per leaf were reduced by 10 and 58% respectively. In the silicate fertilizer treatment, infected leaf numbers and numbers of colony per infected leaf were suppressed only by 6 and 16%, respectively, and the efficacy was lower than that of the fungicide triflumizol. The combined treatment of silicate fertilizer and the fungicide suppressed powdery mildew more effectively, and infected leaf numbem and numbem of colony per leaf were reduced by 31 and 80%, respectively. These results indicate that although silicate fertilizer itself is not much effective in the suppression of powdery mildew, it can significantly enhance the efficacy of the fungicide.

敎育政策의 實際的 變遷에 관한 實證的 硏究 : 敎育豫算 彈性値 分析을 중심으로

李美娜,裵鍾根,郭泳宇 弘益大學校 敎育硏究所 1992 敎育硏究論叢 Vol.- No.8

This study aims to expose what is going on in educational policy change at a financial level for thirty years (1960-1990). Based upon this research questions' findings, we enabled to compare the planning with the implementation of educational development programs. To analyze these research questions, this study uses data including educational budget and policy reports made by the ministry of education during 1960-1990. The educational budget data were analyzed with regression models using loglinear transformation. This study finds scale of educational budget to total government budget is a little elastic(elastic coefficient= 1.05). However, in the near future we cannot expect the amount of educational budget to increase as much as we need to make students' educational circumstances at an optimum level. This is because of "small government policy" in the sense of financial scale, which has helped Korean firms to accumulate capital through exemption from many kinds of taxation. We think the policy priority of economic and social development goals(esp. excellence of education) should be readjusted as soon as possible. The most important policy to our ministry of education during the last thirty years seems to increase the equal opportunity of education in terms of access. It is prior to other educational policy goals such as an equal opportunity of educational process, excellence of education etc.. What is surprising is that budget of special education for handicapped to total educational budget is quite unelastic(elastic coefficient =.870). Special education has to be supported more strongly if the ministry of education considers equality of education the most important policy goal. Regarding policy of excellence education, textbook compilation, budget and audio-visual education budget to total budget of the ministry of education are unelastic. Good textbooks and teaching methods are critical for a high quality of education. The ministry of education should concern these areas financially as well as nominally in order to improve the quality of education in an efficient way. Both the budget of vocational education(1.06) and that of social education(1.32) to total budget are elastic. The former seems to be considered very important in an economic sense and the latter in the sense of equality of educational opportunity for non-school population. However, the budgetary amount of vocational education should be increased much more in the near future. If not, the present proportion of highschool students of nonvocational school to vocational school(64 : 36) will not be able to be reverted to nominally aimed proportion(3 : 7). The lack of supply of workers in the Korean labor market today will not be loosened, either. What is more important among this study's findings is a gap between nominal policy goals and actual goals. That is in most educational policy fields we did not find statistically significant differences in terms of educational budget scale between years announced officially to be important and years not announced. These findings prove dual structure between educational planning and implementation. We argue planning and financial allocation to be consistent in order to get rid of educational planning divorced from implementation contexts, or implementation unhitched from some form of planning. Without strong links between the planning and implementation of educational development programs, we cannot achieve programs of educational development efficiently.

혀에 작용하는 capsaicin에 관한 감각 정보의 특성

이배환,김기석,김기영,진춘조,나흥식,홍승길 한국심리학회 1999 한국심리학회지 생물 및 생리 Vol.3 No.1

본 연구는 혀에 작용하는 capsaicin이 유발하는 감각 정보의 특성을 알아보기 위해 수행되었다. α-chloralose로 마취한 고양이에게 기계적 자극, 미각자극, capsaicin을 혀에 도포하고, 동통 유발 물질과 capsaicin을 혀의 동맥에 주입하면서 고삭신경과 설신경에서 신경의 활동을 기록하였다. 고삭신경에서 혀에 도포한 capsaicin에 대한 반응은 미각 자극 및 혀의 동맥에 주입한 동통 유발 물질에 대한 반응과 상관이 있었다. 혀의 혈관에 주입한 capsaicin에 대한 고삭신경의 반응은 혀에 도포한 capsaicin 및 혀의 혈관에 주입한 동통 유발 물질에 대한 반응과 상관이 있었다. 설신경에서 혀에 도포한 capsaicin에 대한 반응은 동맥에 주입한 동통 유발 물질에 대한 반응과 상관이 있었다. 혀의 혈관에 주입한 capsaicin에 대한 설신경의 반응은 혀에 도포한 capsaicin 및 혀의 혈관에 주입한 동통 유발 물질에 대한 반응과 상관이 있었다. 이러한 결과는 capsaicin이 혀에 작용할 때 동통뿐만 아니라 미각에 관한 정보도 유발한다는 것을 시사한다. 이때 미각에 관한 정보는 고삭신경을 통해 중추로 전달되며, 동통에 관한 정보는 설신경을 통해 전달되지만, 동통에 관한 정보가 고삭신경을 통해 전달될 가능성도 배제하지 못한다. The present study was performed to investigate the characteristics of sensory information produced by capsaicin in the tongue. Activities of the chorda tympani(CN) and lingual nerves(LN) were recorded while taste stimuli and capsaicin were being applied topically, and capsaicin and algesics were being injected intra-arterially to the tongue of cats anesthetized with α-chloralose. Responses of the CN fibers to topically applied capsaicin were correlated with those to taste stimuli and intre-arterially injected algesics. Responses of the CN fibers to intra-arterially applied capsaicin were correlated with those to topically applied capsaicin and intra-arterially injected algesics. Responses of the LN fibers to topically applied capsaicin were correlated with those to intra-arterially injected algesics. Responses of the LN fibers to intra-arterially aplied capsaicin were correlated with those to topically applied capsaicin and intra-arterially injected algesics. These results suggest that capsaicin provoke taste as well as pain sensation in the tongue. Taste information produced by capsaicin is conveyed to the brain via the CN and pain information via the LN. However, the possibility that pain information may be conveyed via the CN can not be excluded.

전문대학 간호과 통합교과과정 개발에 관한 연구

김영희,김정수,김정애,방숙명,배경진,이애경,장은정,정안순,주미경,최나영 경복대학 1998 京福論叢 Vol.2 No.-

교과과정의 조직은 체계적이고 뜻이 있는 순서로 학생들을 가르치기 위해 지식을 어떻게 조직화할 것인지와, 과목들 사이에서 공통된 내용은 통합시켜 중첩되는 일이 없도록 조정할 필요가 있다. 이에 현재 본 대학 간호과에서 운영되었던 97학년도의 17개 전공과목들의 교과과정의 내용을 비교, 분석하여 중복을 줄이며 순차적 지식의 습득을 도모하는 새로운 통합교과과정의 틀을 개발, 제시함으로써 보다 나은 전문직 간호교육이 이루어지도록 하고자 하였다. Most curricula are considered how to teach the student in systematic and meaningful orders. And it is necessary to coordinate the duplicate contents in major subjects in nursing. So this study was designed to set up a new comprehensive curriculum through comparing and ananlyzing each seventeen major subjects in Nursing Department of Kyung-Bok College. Therefore, the purpose of this study is to present the new comprehensive curricula for promoting the efficiency and effectiveness in diploma degree course of nursing education.

눈알고둥, Lunella coronata coreensis의 생식주기

오성립,나오수,이영돈,김형배 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-

눈알고둥,Lunella coronata coreensisd의 생식주기

오성립,나오수,이영돈,김형배 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-

We investigated reproductive cycle of the turban shell. Lunella coronata coreensis with the histological preparation of gonads and the gonadosomatic index (GSI). The turban shells were collected at the intertidal zone of Hamdeok in Jeju-Do from December. 1995 to October. 1996. The gonad was located on the surface of the liver below the stomachal caecum Posterior spiral meat part of the shell. GSI value began to increase from May as water temperature increased and reached its maximum value in August both male and female which were 56.94 and 61.88. respectively. GSI started to decrease from September thereafter. maintaining relatively low value from January to March. The reproductive cycle of L. coronata coreensis could be grouped into five successive developmental stages : multiplicative stage (female: February to April. male. April to May). growing stage (female: April to June, male: June). mature stage (female: June to August, male: July to August). ripe and spawning stave (August to September). And degenerative and recovery stage (October to March). The spawning of the turban shell occurred from August to September and the main spawning period appeared in September. The turban shell. L. coronata coreensis appeared to be gonochoristic species. Sex ratio of female to male was 1.6 : 1.0 (P > 0.05).

지식 언톨러지 개념을 이용한 전문 문서의 지식미디어 시스템에 관한 연구

오창윤,조정래,나영남,배상현 조선대학교 통계연구소 2000 統計硏究所論文誌 Vol.2 No.1

The knowledge of the specialized fields has been changed rapidly in the both side of quantity and quality. A hyper media as a knowledge based system is so fixed in the linked media in mutual that we could not tell it information provision with the view of user. In this paper, we propose the way of offering intellectual and flexible information which is same with demand in the side of user, selecting, searching and composing the HyperText at the point of user's view through the design of knowledge media system, three concepts is used in order to challenge the knowledge media system : special document, agent system and ontology. The special document is a knowledge using special fields. The agent system is a homogeneous controller that operates on an application to ensure that its activities are coordinated with those of the others within the community, providing a uniform control mechanism. The last 3th concept, ontology is a language for exchanging knowledge, which is a message exchanged among agents to ensure the proper interaction among them. The combination of these three concepts is used designed the prototype of knowledge media system.