복합조직강 중 변태페라이트양에 따른 기계적 특성 변화

김동건,이기정,이준정 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.10

Effect of transformed ferrite content on the mechanical properies of dual-phase steels has been studied and analyzed on the basis of observation on the austenite-to-ferrite transformation behavior during post-anneal cooling. Various contents of transformed ferrite were obtained by changing intercritical annealing temperature. As the transformed ferrite content was increased up to about 40%, dual-phase properties became better due to the finer distribution of martensite particles. However, the dual-phase properties were deteriorated when the transformed ferrite content becomes larger than the retained ferrite content. The significance of these results is discussed in relation to the austinite-to-ferrite trans formation behavior during intercritical annealing.

사이버의료광고의 규제와 그 문제점

김동건 培材大學 附設 社會科學硏究所 2005 사회과학연구 Vol.27 No.-

In 27th Oct. 2005, the constitutional court deliver the decision that medical advertisement prohibiting clause of medical law is unconstitutional that prohibit the advertisement of medical technik or medical method. After this decision, it is predicted that competitive medical advertisement will be severe in the near future. Traditionally, it is thought that the medical advertisement should be prohibited or controlled by the government. Because it is moral that the medical care would not become the subject of trade. And if the medical advertisement be permitted, it will delude the patient and it result in the increase of imaginary demand of medical care. But in other sense, the patient has the right to know and medical advertisement is the way of information-transmission. It is very important that every patient has the right of self-decision. For that, every information should be transmitted to them. In cyber-space, the scale of information-transmission is much larger, and speed of that also is much more rapid. So the self-regulation of the medical practice is much more important. And in America, there are self-regulation organization such as AMA. Autonomy or regulation, that is the matter of choice. The patients' right to know should not be ignored. In that meaning, the decision of the constitutional court is very admirable. But the permission boundarty should be examined precisely.

SVM에서의 변수선택법 구현

김동건,조권익 동덕여자대학교 2003 정보과학연구 Vol.7 No.-

SVM은 관측치의 수에 비해 입력변수가 많은 경우 안정적인 성능을 보여 유전자데이터와 같은 고차원 자료분석에 많이 사용되고 있다. 그러나 판별능력은 뛰어나지만 해석이 용이하지 않고 각 입력변수가 판별에 미치는 공헌도를 알 수 없다는 단점이 있다 본 연구에서는 Guyon 등이 SVM에서 입력변수의 중요도를 결정하기 위해 제안한 Recursive Feature Elimination 방식을 소개하고 실제 사용 가능하도록 R에서 구현하였으며 모의자료에 적용하여 그 유용성을 검토하였다. The SVM is known to show stable performance in analyzing data with more features than observations such as microarray data. Although the SVM works well in prediction, the interpretation of the result from the SVM is quite difficult. The contribution of each feature is not easy to measure so far. In this study, we have investigated the performance of the Recursive Feature Elimination(RFE) method for feature rains newly suggested by Cuyon et al. We have implemented RFE routines in R and applied to some simulated data.

음악줄넘기 운동이 중학교 여학생의 자기효능감에 미치는 영향

김동건,허공숙 忠南大學校體育科學硏究所 2001 體育科學硏究誌 Vol.19 No.1

The purpose of this study was to identify the effects of the music rope-jumping on self-efficacy of middle school students. The sample comprised 90 students aged 15 years, randomly selected from a total population of 400 students registered in the second grade for the academic year of E middle school in Taejon. The sample were randomly assigned into the treatment, consisting of the music rope-jumping and the control group. Results showed that there were statistically significant differences between the music rope-jumping group and the control group on the cognitive self-efficacy and physical self-efficacy, but no statistically significant differences between two groups on the social self-efficacy. These results indicated that performance-based mastery experiences involving guiding a participant through the progressive stages of skill acquisition until he or she achieves mastery can enhance self-efficacy of middle school students.

스팸메일 포착을 위한 데이터마이닝 기법 비교

김동건,조진남,장도석 同德女子大學校 情報科學硏究所 2004 정보과학연구 Vol.8 No.-

스팸메일로 인한 사회적 손실이 급증하고 있는 가운데 스팸메일을 포착하는 각종 방법들이 개발되고 있다. 본 연구에서는 스팸메일엔진에 사용 가능한 데이터마이닝기법을 단일기법과 혼합기법으로 나누어 Spambase데이터에 적용하였다. 적용 결과, 가장 많이 쓰이고 있는 Naive Bayes기법의 성능이 가장 저조하였던 반면, SVM과 복합기법의 성능이 탁월한 것으로 나타났다. This study compares recently developed data mining algorithms for detecting spam mails. We have considered single classifiers, such as Naive Bayes classifier, LDA, QDA, logistic discriminant, and support vector machines and ensemble methods such as Bagging and Random Forest. While SVM and ensemble methods show excellent performance, Naive Bayes classifier which has been popular in detecting spam mails shows low performance.

公共投資事業의 經濟性分析

金東建 서울大學校 行政大學院 1980 發展政策硏究 Vol.1980 No.8

선정된 체력요인이 주행시 운동학적 요인에 미치는 영향

김영일,김동건 韓國體育大學校 1997 論文集 Vol.20 No.-

The purpose of this study is to evaluate the effect of the selected physical fitness on the kinematic variables during running. Subjects were 8 collegiate males from H. university. The kinematical variables on the running were analyzed with cinematography after testing the physical fitness. The physical fitness parameters such as reaction time for the whole body, strength for the knee and the ankle joint, and flexibility for the hip joint were tested. A high-speed video camera (S- VHS) was positioned perpendicular to the runway to record the movement of all runs. A camera was set at 60 fields/s with an exposure time of 1/1000 sec. Pearson's correlation coefficient was used to determine the relationship between the physical fitness parameters and kinematic variables during running. On the basis of the results, the following conclusions were drawn; 1. There were significant relationship between the reaction time and the angular velocity at heel strike, the angular displacement of the knee joint at toe off, and the vertical displacement of C.M (P<0.05). 2. The plantar flexor strength of the ankle joint had an effect on the swing time and the angular velocity of the ankle joint (P<0.05). 3. There were correlation between the dorsal flexor strength the ankle joint and the angular velocity of the ankle and the knee joint at midstance (P<0.05). 4. There was a significant relationship between the knee flexor strength and the angular velocity of the ankle joint at midstance. 5. The flexibility of the hip joint had an effect on the angular velocity of the hip joint and the ankle joint at toe off, the angular velocity of the ankle joint at midstance, and the angular velocity of the ankle joint and the knee joint at toe off.

이해룡전에 나타난 매신 모티브 고찰

김동건 慶熙大學校 文理科大學 國語國文學會 1997 慶熙語文學 Vol.17 No.-

요오드처리에 의한 Nylon 6의 構造變化

金東建,金圭範 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

This study is carried out to investigate the structural changes of stretched and rolled nylon 6 monofilaments by immerse treatment with I_2-KI aqueous solution. The results obtained are as follows; The structure was changed to a-type in crystalline region and are depended upon the treating time into I_2-KI aqueous solution. According to the results of X-ray diffraction and density, r-type crystal begins to appear partially in the immersion of 2 hours and spread to almost complete r-type crystal after 24 hours immersed. The small angle X-ray diffraction patterns of rolled sample showed that the two axis orientation was disappeared by the treatment for 24 hours whereas the influence remained in microstructure.

테니스선수들의 경기정위, 경쟁불안이 능력 및 노력귀인에 미치는 영향

김동건,임종은,김윤태 충남대학교 체육과학연구소 2000 體育科學硏究誌 Vol.18 No.1

This purpose of this study was to analyze the effect of tennis players' competitive orientation and competitive anxiety on ability attribution and effort attribution. For this purpose, this study was conducted for 110 male high school tennis players and 107 female players in the specific task of tennis and the actual situation, based on Burton'(1992) competitive goal-setting, Vealy's sports confidence and Weiner's attribution theory. And it attempted to identify the effect of tennis players' competitive orientation and competitive anxiety on the forms of attribution. Accordingly,. this study set performance orientation and outcome orientation of competitive orientation, and cognitive state anxiety, physical state anxiety and confidence of competitive anxiety as independent variables. And it set as the dependent variables the ability and effort especially related to the sport context among four dimensions of attribution such as ability, effort, task and exercise, by dividing them into the time of success and failure. An attempt was made to conduct regression analysis. As a result the following result was obtained: First, an attempt was made to analyze the effect of performance orientation, outcome orientation, cognitive state anxiety, physical state anxiety and confidence on ability success attribution. As a consequence, it was found that they did not have a significant effect on ability success attribution in case of male players as shown in Table 10. But it was found that confidence had a significant effect on ability success attribution in case of female players(t=2.860, p=.005). Second, an attempt was made to analyze the effect of performance orientation, outcome orientation, cognitive state anxiety, physical state anxiety and confidence on effort success attribution. As a consequence, it was found that cognitive state anxiety had a negative effect on effort success attribution in case of male players as shown in Table 11(t=-2.543, p=.012), but physical state anxiety had a positive effect on effort success anxiety. But it was found that outcome orientation and confidence had a significant effect on efforts success attribution at the time of success in case of female players. Third, an attempt was made to analyze the effect of performance orientation, outcome orientation, cognitive state anxiety, physical state anxiety and confidence on ability failure attribution. As a consequence, it was found that in both male and female players performance orientation had a negative effect on ability failure attribution. But it was found that outcome attribution had a positive effect on ability failure attribution only in case of female players. Fourth, an attempt was made to conduct the effect of performance orientation, outcome orientation, cognitive