곰솔(Pinus thunbergii )에서 소나무재선충병 예방을 위한 나무주사용 약제선발

이상명(Sang Myeong Lee),김동수(Dong Soo Kim),이상길(Sang Gil Lee1),박남창(Nam Chang Park),이동운(Dong Woon Lee) 한국농약과학회 2009 농약과학회지 Vol.13 No.4

네트워크 모델에서 원형 문자열 정렬에 관한 연구

이재동,최길림,김순철 慶南專門大學 2000 論文集 Vol.28 No.1

나사용 한계게이지의 CAD화에 관한 연구

이동주,이광길 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.5

The CAD system which enables to design and draw the screw thread gauges was developed and constructed. This system was proposed based on Visual C++ Version 5.0. Even beginners can get drawings as well as concerned data for the manufacturing of screw thread limit gauges by selecting the input data. This system was constructed from relevant standards and regulations and was developed based on the Korean Standard and referred to ISO, JIS, handbooks and textbooks. This system shall provide more powerful and user friendly tool for design and drawing for screw thread gauges such as metric fine and coarse threads, unified fine and threads, parallel and taper pipe threads. The results of this system are proved to be in good agreement with concerned standards and regulations.

온도변화에 따른 알루미늄합금 용접부의 피로수명에 관한 연구

이동길,양승훈,김건호,정재강 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1

본 연구에서는 저온용기 등에 많이 사용되고 있는 알루미늄 합금 A15083-0재에 대한 보호가스 혼합비율과 피로수명과의 관계를 규명하고자 혼합가스 비율을 여러 가지로 달리하여 GMA 용접을 실시하였다. 시험온도는 상온에서 극저온까지 단계적으로 낮추어가며 실시하였다. 용접재의 피로수명은 모든 불활성가스 혼합비율 및 노치 가공위치에서 모재보다 높은 피로수명을 보였으며, 영향부, 용융선 및 용착금속부 순으로 피로수명이 증가하였다. 상온에서부터 -85℃까지는 온도가 낮아짐에 따라 피로수명은 모재 및 Ar33%+He67%의 경우 증가한 반면, 다른 불황성 가스혼합비에서는 감소하는 경향을 나타내었며, -196℃ 극저온에서는 피로수명 크게 증가하여 저온재료로서 유용한 성질이 나타났다. The influence of mixing shield gas ratio and test temperature on fatigue life of welding zone were examined experimentally for a AI5083-O aluminum alloy. The GMA(Gas Metal Arc) welding was carried out for weld specimen with various mixing gas ratio(Ar100% + He0%, Ar67%+He33%, Ar50%+He50%, and Ar33%+He67%). The tested temperature range was from room temperature(+25℃) to cryogenic temperature(-192℃). The welding zone was divided into four sub-zones for analysis ; weld metal, fusion line, HAZ, and base metal. In the influence of mixing gas ration, fatigue life of weld metal was decreased with higher Argon gas ration, but fusion line and HAZ specimens were not influenced greatly, The fatigue life increased at lower temperatures, particularly at -196℃. It was known availability that the A15083-O is appropriate for used low temperature material.

Lolita에 나타난 세 목소리

이길동 현대영미어문학회 2000 현대영미어문학 Vol.17 No.2

There is no denying Nabokov must be an experimental stylist, for his novels such as Pale Fire, Transparent Things and Lolita are well known for their peculiar narration. Since the publication of Lolita, Many critics gave his novels various reviews, which are too variated to be categorized into one sect. In the case of Lolita they don't agree what kind of novel Lolita is. Some say it is a modem style novel. Others comment it is of the post-modern style. One commentator says it is a pornographic novel. Above all their criticisms are monolithic. It is very difficult to understand Lolita in such simple ways. Lolita begins with a very shocking story: Humbert, 37 years odd, has a sexual re1ationship with his step-daughter, Lolita who is 12 years old. The relationship begins after his wife's death. However, readers grow used to this shocking story while reading, for Nabokov uses various literary devices such as allusion, pun and parody in a strategy of 'defamilization' which is associated with Russian Formalism. In the novel, the character Lolita becomes the character Annabel Lee from Edgar Allen Poe's work and the character Carman from Meremee's work, which means Lolita is not real but imaginary character created through allusion, a part of parody. The frequent use of pun also achieves the effect of 'defamilization'. Father, the frequent intrusion of author undermines the reality of the novel. The 'work-within-a-work' style or 'chinese box' structure also serves in the same manner. These formalistic techniques reveals two tendencies, the first is that the methods help create artifiality of the novel, which means the absence of reality. The other is that the Russian formalistic literary devices, especially the 'defamilization' undermine the intensity of the shock in the story. Nabokov plays a game with the readers , Humbert makes Lolita an illusionary figure, which makes readers feel comfortable because they think the story is not true. But readers again believe in the reality of the story. Humbert kills Quility because he feels Quility is more evil than he. Humbert feels Quility has taken advantage of Humbert's sin. Readers feel in this scene Humbert actually kills himself because they are double.(297) In the last chapter, Humbert becomes a different figure, he achieves true development. He realizes Lolita is no longer a nymphet, and he comes to know that the hopelessly poignant thing was not Lolita's absence from his side, but the absence of her voice from that concord. Therefore, I hold that Lolita is neither post-modern nor modern, nor realistic but an open novel in which all 'sm' swim free.

납기와 조립가능 시점을 고려한 병렬기계의 스케쥴링을 위한 발견적 해법

이동현,이경근,김재균,박창권,장길상 한국경영과학회 2000 한국경영과학회지 Vol.25 No.2

In this paper, we consider an n-job, non-preemptive and identical parallel machine scheduling problem of minimizing the sum of earliness and tardiness with different release times and due dates. In the real world, this problem is more realistic than the problems that release times equal to zero or due dates are common. The problem is proved to be NP-complete. Thus, a heuristic is developed to solve this problem. To illustrate its suitability, a proposed heuristic is compared with a genetic algorithm for a large number of randomly generated test problems. computational results show the effectiveness and efficiency of proposed heuristic. In summary, the proposed heuristic provides good solutions than genetic algorithm when the problem size is large.

미소원공결함을 갖는 자동차 전륜구동 축재의 피로수명 예측

이동길,오환교,정재강 朝鮮大學校 機械技術硏究所 1998 機械技術硏究 Vol.1 No.1

본 연구에서는 현재 생산되고 있는 자동차의 전륜 구동축재료 S43C와 S50C를 대상으로 회전굽힘피로시험을 통해 고주파열처리와 온도조건에 따른 피로크랙 전파거동을 고찰하고, Nisitani가 제안한 역학적 변수에 의해 재료상수를 구한 후 그 적용성을 검토해 보았다. 비열처리재 S43C 및 S50C의 피로한도는 각각 98.1MPa, 107.9MPa이었으며, 열처리재는 각각 147.1MPa, 156.9MPa로서 열처리 후 두 재료 모두 피로한도가 약 49MPa씩 증가하였으며, 저온(-30℃)에서의 피로수명은 상온(25℃)에서보다 두 재료 모두 비열처리재는 약 110%, 열처리재는 약 120% 증가하였다. 또한 본 재료에 실험으로부터 얻어진 재료상수를 Nisitani의 피로크랙전파속도 예측식에 적용하여 피로수명을 예측한 결과 고주파 열처리 여부와 실험온도 조건에 관계없이 약 5% 내외의 낮은 오차를 보이며 잘 일치함을 알았다. In this study, the rotary bending fatigue test was carried out with two kinds of materials, S43C and S50C, using in the front engine and front drive shaft of vehicle. The specimens were heat-treated by high frequency induction method and tested at +25℃ and -30℃ in order to look over the influence of the heat treatment and the temperatures. The mechanical factor, C(2a)p, proposed by Nisitani was employed in the present study to compare the results of fatigue life obtained from experiment and prediction. The fatigue limit of the as-received specimens S43C and S50C were 98.1MPa and 107.7MPa, and that of the heat-treated S43C and S50C were shown 147.1MPa and 156.9MPa respectably. It means that the fatigue limit was increased about 49MPa by high frequency heat treatment. Fatigue lifes of the specimens tested at low temperature(-30℃) showed about 110% for as-received, 120% for heat-treated higher than at room temperature(25℃). It was found the crack length at onset or final fracture tested at low temperature was shorter than the crack length at room temperature(+25℃). The fatigue lifes were predicted with an equation of the fatigue crack propagation proposed by Nisitani, d(da/dN)=C(2a)p, the results were found to be within 5.0% error by comparison with experimented results.

작업의 특성에 종속되는 병렬기계의 일정계획을 위한 발견적 기법

이동현,이경근,김재균,박창권,장길상 한국경영과학회 2000 經營 科學 Vol.17 No.1

In the real world, situations that some jobs need be processed only on certain limited machines frequently occur due to the capacity restrictions of machines such as tools, fixtures, or material handing equipment in this paper, we consider n-job, non-preemptive and m parallel machines scheduling problem having two machines group The objective function is to minimize the sum of earliness and tardiness with different release times and due dates The problems is formulated as a mixed integer programming problem The problem is proved to be NP-complete Thus, a heuristic is developed to solve this problem To illustrate its suitability and efficiency, a proposed heuristic is compared with a genetic algorithm and tabu search for a large number of randomly generated test problems in ship engine assembly shop Through the experimental results, it is showed that the proposed algorithm yields good solutions efficiently

試驗不安 克服訓練이 高等學生들의 試驗不安 減少에 미치는 效果

李東佶 경북대학교 학생생활연구소 1985 學生指導硏究 Vol.18 No.1

The purpose of this study was to examine effects of test anxiety-coping training (TACT) program for the reduction of test anxiety. Twenty-four test anxious high school boys, who volunteered to participate in TACT profram, were randomly assigned to either anexperimental group or a control group. The subjects of the enperimental group received seven 60-minnte training sessons according to TACT progam for four weeks. The subjects of control group were told that their training would be delayed until the training of the experimenal group was completed. TACT program consisted of relaxation training, rational restructuring, test anxiety hierarchy, and coping with test anxiety through the imagination of test anxiety situations. Effects of TACT program were assesed in terms of a Korean version of Test Anxiety Inventory (TAI). KTAI provides two subscale scares for measuring worry and emotionnlity which appear to be the major components of test anxiety. KTAI was administered to all subjects twice, before (pre-test) and after (post-test) the training sessons. A 2 (experimental conditions) × (2) (pre-and post-test) ANOVA was applied for worry Score, emotionality score, emotionality score, and total score respectively. The major findings of the present study were as followed: a) TACT program effectively reduces worry, emotionality and total scores of high school student's test anxiety. b) Therefore, Cognitive behavior therapy containing systematic desensitization and cognitive restructuring procedures is effective for reducing both worry and emotionality in test situations. c) To generalize the results of this study, future research is needed to investigate the improvement of academic performance through test anxiety and the comparative effectiveness of systematic desensitization, cognitive restructuring and combined procedures in reducing test anxiety.

미소원공결함을 갖는 차량 밸브용강재의 피로크랙진전거동에 관한 연구

이동길,이상열,정재강 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1

본 연구에서는 자동차 밸브에 사용되고 있는 내열강 STR3과 STR35를 마찰용접한 후 모재, 열영향부 및 접합선(bond line)에 미소 인공결함을 가공하여 피로크랙 발생 및 전파 거동, 피로수명 및 기계적성질의 상관관계를 조사하는 연구를 수행하였다. 평활재의 피로한도시험 결과 STR3의 피로한도는 429.0MPa이며, STR35는 409.4MPa로서 항복강도가 높은 STR3의 피로한도가 약 20MPa이 높게 나타났다. 미소원공결함이 접합선으로부터 1.0mm떨어진 곳에 가공된 시험편의 피로수명은 모재보다 STR3은 약99%, STR35는 약 25%씩 증가한 반면 접합선에 미소원공결함이 가공된 시험편은 모재보다 STR3은 약 20%, STR35는 약 72% 감소하였으며 파괴전 관찰된 최종크랙길이도 크게 감소하였다. 또한 피로크랙길이와 파단수명비의 관계식에 본 시험재료를 적용한 결과 마찰용접 및 미소원공결함의 위치에 관계없이 비례관계가 있음을 알 수 있었다. The fatigue crack propagation characteristics were investigated for two kind of heat-resisting steel, STR3 and STR35, commonly using in valve material of vehicles, in order to evaluate the fatigue crack propagation behavior and fatigue life of dissimilar friction welding zone. The fatigue limits of the as-received specimens, STR3 and STR35, were 429MPa and 409.4MPa respectably. The fatigue life of the specimen showed about 99.1% for STR3, about 25.2% for STR35 higher than that of the base metal specimen. But the fatigue life of bond line notched specimen was shown about 20% for STR3 and about 72% for STR35 shorter than that of the base metal specimen.