객체-관계 매핑 프레임워크 성능 측정

박기남,김영찬 한밭대학교 정보통신전문대학원 2005 정보통신전문대학원 논문집 Vol.3 No.1

최근 들어 소프트웨어 개발 언어에서는 객체지향 언어(JAVA, C# 등)들이 점차 주목을 받고 있다. 하지만 대부분의 영구 데이터 저장 장소로 관계형 데이터베이스(RDB)를 사용하고 있고, 이에 따라 관계형 데이터베이스와 객체지향 언어를 같이 사용하기에 많은 어려움이 따르며, 관계형 데이터를 객체형 데이터로 바꾸는데 많은 개발 시간을 요하게 된다. 이와 같은 문제점을 해결하기 위하여 관계형 데이터와 객체형 데이터 간의 변환을 지원하기 위한 많은 프레임워크(Hibernate, JDO, Castor 등)들이 속속 등장하였다. 본 논문에서는 객체관계 프레임워크(ORM Frameworks)중에서 Hibernate를 사용한 Pet Store와, EJB를 사용한 Pet Store를 구현하여 각각의 Database Access속도와, 코딩양들을 비교 분석 하여 본다. Object-oriented languages such as C++, Java or C# are getting attention gradually as software development languages recently while relational databases which have been around since the 1960s have remained as primary databases. Writing an object-oriented application that stores data in a relational database set developers up for a large maintenance burden because there is an impedance mismatch between object model and relational model. To alleviate such problem, it is recommended to use the persistent framework. The persistent frameworks can allow developers to map normal objects to relational tables with minimal effort. As a result, a lot of frameworks such as Hibernate, JDO, and EJB appeared successively. In this paper, we benchmark the Hibernate and EJB frameworks using Java Pet Store which is a de facto reference implementation provided by Sun.

『한성순보』 소재 「亞里斯多得里傳」에 관한 연구

김찬기 현대문학이론학회 2004 現代文學理論硏究 Vol.0 No.21

In this paper, I tried to investigate the characteristic of a ‘Aristoteles-cho^n(亞里斯多得里傳)’ written in the Korean enlightenment period. I mainly focused on the usage of the word, 'Literature' in the writings from the late nineteenth centure to the beginning of 1900 and in this works, and the specific narration method. The narration method of 'Aristoteles-cho^n(亞里斯多得里傳)' indicates the fact that a "cho^n" became a very long story in the enlightenment period, especially by using the specific way of narration that could be abbreviated as showing facts and giving comments on them. A "Cho^n" had changed to be long not only because it was affected by the Western biography but also because the narration method of "Cho^n" had changed like above. In addition, 'Aristoteles-cho^n(亞里斯多得里傳)‘ reflects the affection of a historical biography of the enlightenment period on the formation of a modern historical novel.

慶尙大學生의 就業 活性化 方案

鄭燦基伍,化永福 경상대학교 1995 學生生活硏究所報 Vol.21 No.-

The object of this study is to find and present an activated strategies for the employment of the students of Gyeonsang University. The main problems on the base of the ideas, the needs, and the objects of this study are ; 1)How has the present condition for the recommendations and student's employments of Gyeongsang University been for recent 5 years ? 2)How are their opinions related to the emloyments for the students of '95? 3)How are their opinions and experiences for the employments of the graduates? 4)How are the managers' opinions for the employments of the graduates? 5)How are the parents' opinions for the employments of the students? The based materials of this study used in order to solve the above problems are the ones of thE recommendation and employment for recent 5 years. 1) The students for questions collected of this investigation are 304 students for 76 departments of our colleges in Gyeonsang University. 2)100 graduates from this university during recent 5 years(including assistant professors). 3)100 personnel managers in companies or institutions for employing the graduates of this university. 4)100 students' parents of this university(including some professors in Gyeongsang University). The first step for the accomplishment of this study is to analyse the state of employments for recent 5 years. The second step is to analyse their consciousness for the development of the course or the employment of the graduates of Gyeongsang University. The third step is for the presentation and the solution to a concrete program for the high employment rate based on the 1st and 2nd step. If the active programs are presented on the base in some results of this investigation study, the period of the preparation for the employment, in the consideration of the period for the over-supply and over-demand plan is thought good to be start from the first term of junior. The best plans for preparation of individuals are that they should have the abilities of foreign language and common sense, control training of their personalities and attitudes, put the imformation materials to practical use, and discuss their matters with their olders or their professors. As the graduates of the local university, they had better choose the educational institutions, government offices, goverment enterprises, in consideration of the preference of a university of high reputation of large enterprise, scarcity of job information, and the problems of employment structures. They need to try to get their jobs about 3 times. In the case of the boy students, they need to challenge to get favorite jobs to their tastes. The authority of the university should try to provide them with much job information, training for their certifications, reinforcement of their major subjects, presonality, correction of their attitudes, and management of the program development education, making and putting public materials to use, and the support of the professors, employment, etc.

열린교육의 현장 정착을 위한 아이디어 탐색

정찬기오,이광우 경상대학교 1997 學生生活硏究所報 Vol.23 No.-

The objectives of this study are to examine the ideas for adoptation of open education in classroom, and then provide teachers desirable views of open education. The concrete problems in this study are as following : 1) to examine a historical development and practical program of open education. 2) to examine a ideas and views of open education. The method of this study is literature review. To adopt open education in classroom, following should be considered that the relationship of teaching and learning paradigm elements for opening education should keep logical relation, and which should be child-centered objectives, cotents, and method. The relation among teacher-content-learner should keep itself empirical, the learning tasks, contents and learning activities should also be learner-center direct empirical learning. The classroom environment should be decorated to accomplish open education's aims. It is desirable that the effect of interaction among these elements should be maximum. In addition, a crossing met logical relation connected with learning objectives-contents-method and empirical relation connected with teacher-content-learner, is more transfered learners compare to traditional instruction for an open education. as it were, the paradigm should be as centered for learning activities, contents, and teaching method as possible.

제주도 동남방 신천해안역 해수의 이화학적 특성과 저질분포

최영찬,고기원,김상현 제주대학교 해양연구소 1987 해양자원연구소연구보고 Vol.11 No.-

수퍼차저에 의한 가솔린 機關의 性能에 관한 硏究

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.

超傳導 交流 發電機의 電磁 遮蔽 效果에 관한 有限 要素 解釋

南基讚,韓聲鎭,周秀元 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1

This paper deals with the magnetic shielding effects in the superconductiong a. c. generator using finite element method. Models of three different shields are studied to compare the magnetic shielding effects. Applying 3 phase ac source to the armature, the magnetic flux densities are calculated for directions and frequencies. Because the stability of the superconducting field winding depends on the screening of the magnetic fields, computed results should be used to design the electromagnetic shield of the superconduction generator.

제주도 지하수의 전기비전도도와 염소이온의 지역별 변화 양상

고기원,문영석,최영찬,고용구 제주대학교 해양연구소 1995 해양자원연구소연구보고 Vol.19 No.-

액체-고체 순환유동층의 상승관에서 액상의 점도가 고체체류량 및 열전달계수에 미치는 영향

이찬기,강석환,신광식,송평섭,강용,김상돈 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4

직경이 0.102 m이고 높이가 3.5 m인 액체-고체 순환유동층에서 액체의 점도가 고체입자의 체류량과 열전달계수에 미치는 영향을 검토하였다. 밀도가 2,500 kg/㎥인 유리구슬(d_(p)=1.0, 1.7, 2.1 또는 3.0 mm)과 CMC 용액(μ_(L)=0.96-38 mPas)을 각각 고체상과 액체상으로 사용하였다. 액체-고체 순환유동층에서 고체입자의 체류량은 액체의 유속이나 점도가 증가함에 따라 감소하였고 유동입자의 크기나 입자의 순환속도가 증가함에 따라 증가하였다. 액체-고체 순환유동층에서 열전달계수는 액체의 점도가 증가함에 따라 감소하였고 유동입자의 크기나 순환속도가 증가함에 따라 증가하였으나, 액체의 유속이 증가함에 따라서는 큰 변화가 없었다. 액체-고체 순환유동층에서 고체입자의 체류량과 열전달계수는 다음과 같이 실험변수와 무차원군에 의해 상관식으로 얻을 수 있었다. E_(S) = 0.783U^(-0.100)_(L)G^(0.164)_(S)d^(0.302)_(p)μ^(-0.036)_(L) h = 4349.3U^(0.010)_(L)G^(0.099)_(S)d^(0.151)_(p)μ^(-0.015)_(L) ◁그림삽입▷ Effects of liquid viscosity on the solid holdup and heat transfer coefficient have been investigated in the riser of a liquid-solid circulating fluidized beds, whose diameter is 0.102 m and 3.5 m in height. Glass beads (d_(p)=1.0, 1.7, 2.1 or 3.0 ㎜) whose density is 2,500 ㎏/㎥ and aqueous solutions of carboxymethy cellulose (CMC)(μ_(L)=0.96-38 mPas) have been used as the solid and liquid phase, respectively. It has been found that the solid holdup decreases with increasing liquid velocity or viscosity, but it increases with increasing solid particle size or solid circulation rate. The heat transfer coefficient decreases with increasing liquid viscosity but it increases with increasing particle size or solid circulation rate, however, it does not change considerablely with increasing liquid velocity. The solid holdup and heat transfer coefficient have been well correlated in terms of operating variables or dimensionless groups as fellow: ◁수식원문참조▷

中風早期檢診을 통한 高脂血症과 成人病에 대한 比較硏究

李紀泰,金允植,薛仁燦 대전대학교 한의학연구소 2002 한의학연구소 논문집 Vol.11 No.1

From June 1th to December 31th 2001, the study was carried out 285 person who came to the Daejon oriental hospital for the examination of CVA. The result was as follows: 1. Hyperlipidemia patient is 41%, 50's is the highest. 2. In the case of Hyperlipidemia patient, Taeyum type is 49%, Soyang type is 36% and Soyum type is 15%. but in the Control group Taeyum type is 36%, Soyang type is 44% and Soyum type is 20%. 3. In the case of Abnormal EKC, Hyperlipidemia group is 34%, Control group is 32%. 4. In the case of Liver disease, Hyperlipidemia group is 17%, Control group is 9%. 5. In the case of Diabet mellitus, Hyperlipidemia group is 30%, Control group is 7%. 6. In the case of Hypertension, Hyperlipidemia group is 50%, Control group is 42%.