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전자상거래(Electronic Commerce)의 問題點과 改善方案에 관한 硏究
白基彦,鄭斗鎭,具敎鳳 대구산업정보대학 1999 논문집 Vol.13 No.1
In recent years, there is a commercial transaction through an electronic commerce which is considerably progressed and it brings about lots of changes of consumption patterns. Corresponding to these changes, domestic enterprises and customers are need conversion of recognition on the electronic commerce. Besides, the potential market of electronic commerce in 21C toward enlargement, so our enterprises need confrontation spirit in order not to be made inroad by foreign markets. Therefore, this study was suggested on the methods for the solutions on the every situation of an electronic commerce, related case studies, increasing number of limited user, enhance searching speed, securing of personal information, and legality on the commercial transection etc. These matter should be enact international standard laws for the electronic commerce users.. In addition to these, the customers also should be satisfy on the Web. Finally, market products through a electronic commerce will enhance the competitive edge of enterprises respectively. Electronic commerce will settle as a new paradigm in the field of management in the 21C and advance rapidly.
김봉기,강성수,박순규 진주산업대학교 1999 論文集 Vol.38 No.-
An image retrieval system based on image content is a key issue for building and managing large multimedia detabase, such as trademarks, copyrights, art galleries, museums, picture archiving and communication system. This paper proposes a feature-based image database system where a compound feature vector representing both the color and shape of an image is used. Color information for the feature vector is obtained using the algebraic moment of each pixel of an image based on the property of regional color distribution. Shape information for the feature vector is obtained using the Improved Moment Invariant(IMI) which reduces the quantity of computation and increases retrieval efficiency. In an experiment, we have compared our methods with previous methods using a database consisting of 150 automobile images, and the results of the experiment have shown that our method has a better performance on retrieval effectiveness.
박성봉,김영미,전성일,이기철,김영훈,정영조,이영렬,이정호,최영민 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.6
목 적 : 정 신분열병 환자의 자기만입 정도에 영향을 미치는 인구학적 변인들 및 질병연관 변인들을 규명해 보고자 하였다. 또한. 환자들의 자기만입과 병식 사이의 연관성. 자기만입과 자존심 사이의 연관성을 알아보고자 하였다. 방 법 : 정신과 의사가 병록지와 면담을 통하여 대상 정신분열병 환자들의 인구학적 변인들 및 질병연관 변인들에 관한 자료를 얻고 환자들의 병식 정도를 평가한 후, 환자들로 하여금 자기보고형의 자기만입 척도와 자존심 척도를 시행하게 하였다. 총 111명의 환자가 연구대상으로 선택되었다. 결과: . 1) 여자가 남자보다 유의하게 높은 자기만입 척도 점수를 나타내었다 2) 질병연관 변인들 중 하위집단 사이에 자기만입 척도 점수의 유의한 차이를 보이는 변은 없었다. 3) 자기만입 척도 점수와 병식 점수 사이에 유의한 상관관계가 없었다. 4) 자기만입 척도 점수와 자존심 척도 점수 사이에 유의한 역상관 관계를 보였다. 결 론 : 본 예비 연구의 결과로 보아 정신분열 병 환자의 병식이 부족한 상태에서도 자기만입이 진행될 수 있으며. 자기만입이 심할수록 환자의 자존심이 저하되는 것으로 생각된다. 또한 여자 환자들이 남자 환자들보다 자기만입에 더 취약한 것으로 생각된다. 따라서 정신분열 병 환자의 이해와 치료를 위하여 자기만입에 관한 지속적인 연구가 필요할 것으로 생각된다. objective : This study was conducted to identify demographic variables and illness related variables which may affect the severity of self-engulfment in the patients with schizophrenia. We also studied the relationship between self-engulfment and insight, and the relationship between self-engulfment and self-esteem. Methods : Data on demographic variables and illness related variables for the subjects were gathered from hospital records and clinical interviews by the psychiatrists. Degree of insight for the subjects was assessed through clinical interviews by the psychiatrists. Degree of self-engulfment and self-esteem for the subjects was assessed from the self-engulfment scale and the self-esteem scale respectively. A total of 111 patients with schizophrenia were selected for statistical analysis. Results 1) The females exhibited significantly higher scores than the males on the self-engulfment scale. 2) There was no illness related variable, which exhibited a significant difference among subgroups on the self-engulfment scale. 3) There was no significant correlation between the self-engulfment scores and the insight 4) There was a significantly inverse correlation between the self-engulfment scores and the self-esteem scores. Conclusion : The results of this preliminary study suggest that self-engulfment may develop despite lack of insight and that there was inverse relationship between self-engulfment and self-esteem in the patients with schizophrenia. It also suggests that females are more subject to self-engulfment than males. So, authors suggest that it is valuable to do further studies of self-engulfment in the patients with schizophrenia.
부분 탄성기초를 갖고 종동력을 받는 보의 플러터 불안정
류봉조,류시웅,조창기,이종원 한밭대학교 생산융합기술연구소 2004 생산기반기술연구소 논문집 Vol.4 No.1
In this paper, the dynamic stability of a cantilevered beam partially attached to elastic foundations and subjected to a follower force is studied. The beam has a concentrated mass at an arbitrary position on it. Governing equations are derived by extended Hamilton's principle and the finite element formulations are applied to obtain discretized equations. The influence of some parameters, such as the elastic foundation parameter, the position of partial elastic foundations, mass ratios and rotary inertia of the concentrated mass on the critical flutter load is investigated. Finally, the optimal attachment ratio of partial elastic foundation which maximizes the critical flutter load is found.
김기봉,김미애,김혜경 경기대학교 2009 시민인문학 Vol.16 No.-
모든 학문이 추구하는 것은 진실이다. 역사학이 사실서사를 통해 진실을 밝힌다면, 문학은 허구서사를 통해 진실을 드러낸다. 그런데 이 둘 가운데 무엇이 진실로 들어가는 더 큰 문일까? 아리스토텔레스는 시학에서 실제로 일어난 일을 이야기하는 역사보다는 일어날 법한 일을 이야기하는 시가 진실에 이르는 더 큰 문이라고 주장했다. 시는 보편적인 것을 말하지만 역사는 개별적인 것을 말하기 때문에 그렇다는 것이다. 아리스토텔레스가 설정한 문학과 역사의 우선순위는 동아시아 서사전통에서는 역전되었다. 예컨대 역사서사인삼국사기가 문학서사인삼국유사보다 더 진실에 가까운 것으로 여겨졌다. 서사가 서구에서는 허구에서 역사가 분리하는 방향으로 전개됐다면, 동아시아에서는 반대로 역사로부터 허구가 분화하는 방향으로 나갔다. 근대에 이르러 동서양 모두에서 사실과 진실을 일치시키는 근대 사실주의는 허구를 통해 진실로 들어가는 문을 차단했다. 사실주의 문법에 따라 문학이 역사를 모방하는 역사소설과 같은 장르가 생겨났다. 탈근대에서 팩션의 등장은 사실만이 진실이라는 근대 사실주의 문법의 해체를 의미한다. 이 같은 맥락에서 본 논문은 사실과 허구는 진실과 거짓의 등식이 아닌 현실서사와 꿈의 서사로 이해돼야 한다는 것을 삼국사기와삼국유사에 대한 비교연구를 통해 해명한다. 탈근대주의 문법에 따르면, 삼국사기가 역사서사라면삼국유사는 팩션이라는 것이 본 논문의 테제다.
이동체의 현재 위치 검색을 위한 해쉬 기반 색인 구조의 설계
전봉기 신라대학교 자연과학연구소 2004 自然科學論文集 Vol.13 No.-
Location-Based Services(LBS) give rise to location-dependent queries of which results depend on the locations of moving objects. One of important applications of LBS is to examine tracks of continuously moving objects. Moving objects databases are difficult to use by existent spatial indices such as the R-tree, the grid-file, the quad-tree, the KDB-tree and so on. Because the position of moving object changes continuously, there is problem that expense that the existent spatial index structure reconstructs index dynamically is overladen. In this paper, I propose a dynamic hashing index that insertion/delete costs are low. The dynamic hashing structure is that apply dynamic hashing techniques to combine a hash and a tree to a spatial index. I analyzed the dynamic index structure and the cost model by the frequent position update of moving objects and verified through a performance assessment experiment.
개잎갈나무(Cedrus deodara)의 Allelopathy 效果
房基燮,吉奉燮 圓光大學校 基礎自然科學硏究所 1986 基礎科學硏究誌 Vol.5 No.1
Aqueous extracts of Cedrus deodara inhibited seed germination of Pennisetum alopecuroides, Aster agteratoides, Cassia tora and Oenothera odorata. The degree of inhibition on the germination became severe with increasing concentration. And tests using treatment with aqueous extracts in different developmental stages of each species demonstrated that the inhibition of growth was in the order : seed> 1 leaf stage> 3 leaves stage> 5 leaves stage, but the effect was decreased slightly from 5 leaves stage. To detect the inhibitor, allelochemicals, TLS and HPLC habe employed and 5 phytotocix substance were identified from the leaves of C. deodara. It is assumed that p-Hydroxybenzoic acid may be attributed to the main allelopathic effects of C. deodara on the tested species in this study.
이희봉,정재영,최현구,김기훈,김효기,주정일 충남대학교 농업과학연구소 2001 농업과학연구 Vol.28 No.2
재래종 찰옥수수 F₁ 교잡종에 대한 생육 및 수량비교를 위해 충남대학교 농과대학 실험포장에서 육성한 이들 교잡종의 식물학적 특성에 대한 연구 결과는 다음과 같다. 1. 간장은 대조구에 비해 대학찰×재래찰, FR805/1K₃×고령찰이 가장 크게 나타났으나, FR805/1K₃×대학찰, 찰옥 1호에서 대조구와 비슷하게 나타내었다. 2. 착수수는 간장에서와 마찬가지로 대학찰×재래찰, FR805/1K₃×고령찰이 대조구보다 높게 나타났으나 대학찰×재래찰, 찰옥 1호는 비슷하였다. 3. 분얼수는 각 교잡종들간에 큰 차이가 없었다. 4. 이삭의 길이는 대조구에 비해 교잡종들이 거의 2배이상의 크기를 나타내었다. 5. 이삭직경은 FR805/1K₃× 고령찰의 교잡종을 제외하고 대조구와 비슷하게 나타났다. 6. 이삭열수는 Daehakchal×1K₁/LE만이 대조구와 유의성을 나타내고 기타 교잡종은 대조구와 비슷하였다. In order to evaluate the characteristics of growth and yield in F_(1) waxy hybrids using Korean local maize lines, six hybrids including check, Chalok # 1, were planted at the experinental field of e Chungnam National University. Stem and ear heights of Yeonnong × Jaerae and FR805/IK_(3) × Koryong hybrids were higher than the check hybrid. Number of fillers per plant in all hybrids were similar as 0.3 to 0.5 per plant Ear length of waxy hybrids was longer than 15㎝ of check hybrid and ear diameter was also thicker than check except FR805/IK_(3) × Koryong waxy hybrid. A final result, Yeonnong × Jaerae among hybrids was comparatively superior to other hybrids in the test.
김동기,신이건,전봉준,박찬준 서울産業大學校 1995 논문집 Vol.41 No.1
The supercharging characteristics and the combustion performance of the spark iginition engine are investigated through the experiments. The apparatuses used in the experiment are the carburetor type 1468cc Gasoline Engine and the screw type supercharger. A supercharger pulley and a water pump pulley through V-belt are connected to the engine. The diameter of supercharger pulley is 63mm. The diameter of water pump pulley used are 63mm and 135mm,repectively.A optical senser is used to measured the speed of a engine. The pressure in first cylinder is measured. The rate of pressure rise and the rate of heat release are calculated. The engine speed considered is increased by 500rpm from 1500rpm to 3500rpm. It is found that the supercharging characteristics and the combustion performance in case of the engine with supercharger are increased at low speed range. Compared the supercharged engine with the natually aspirated engine, the most effects of supercharging on the torque and the rate of maximium pressure rise are observed at 2000rpm and 1500rpm, respectively.