http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
EJB를 사용한 네트워크 게임 개발 방법론에 대한 고찰
정윤준,이대웅 상명대학교 자연과학연구소 2001 自然科學硏究 Vol.8 No.-
게임의 구동 환경이 단순한 클라이언트- 서버 모델에서 n - tier의 형태로 변화되었을 뿐만 아니라, 이용자 수 증가와 이에 따른 트랜잭션 과부하의 처리, 네트워크 상의 트래픽 처리, 연속적인 데이터의 브로드캐스팅과 움직임의 동기화 문제, 다른 기종간의 메시지 교환, 그리고 보안 및 사용자 인증 문제 등 기술적으로 극복해야만 하는 많은 문제점들이 생겨났다. 네트워크 게임이라면 본질적으로 가질 수밖에 없는 이러한 문제점들은 결국 각각의 개발자들의 몫일 뿐만 아니라 개발 시간과 비용 면에서 중복투자가 불가피하게 이루어지고 있어 결국 소프트웨어의 생산성 저하를 야기시키고 있다. 본 논문에서는 기존의 네트워크 게임 개발의 문제점들을 알아보고 네트워크 게임 개발에 J2EE환경에서의 서버-사이드 컴포넌트 구조인 EJB를 네트워크 게임 개발에 사용될 수 있는 공통적 서비스 형태로 개발하고, EJB를 이용하여 간단한 게임을 만들어 실험해 봄으로써 EJB를 활용한 네트워크 게임 개발의 방법론에 대해 고찰한다. In the development of network game, several issues such as duplicated design and implementation of protocol or message packet, transaction processing, authent ication and security, exchange data platform- independently, reuse of component are to be solved. In this paper , we examine those issues and suggest the new development methodology that apply the EJB, server - side component architecture in J2EE environment, to develope network game. And we experiment our proposed method by running a small demo network board game. As a result , it is shown that the speed of EJB- based game is performed slower than that of TCP/IP- based game. Because EJB is not published for the game development but general- purpose server - side component technology . It will be expected that we should get development - convenience and high software productivity using EJB, if we research further about EJB it self and the applicat ion method for developing the network game.
나노 금속 박막의 Cold-tribonanolithography에 대한 특성
정윤준(Jung Yoon Jun),박정우(Park Jeong Woo) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This paper demonstrates the characteristic of micro scale tribo-nanolithgraphy (TNL) machining on the surfaces of metallic thin films which have poor machinability in micro scale. TNL is one method of atomic force microscopy (AFM) lithography which is more effective fabrication technology, as compared to conventional photolithography due to its relatively simple process, high resolution, short processing time, and low cost. We propose ultra-precision machining at sub-0℃ temperatures using a lab-made micro polycrystalline diamond (PCD) tool on a retrofited piezo stage with a Peltier device. The workpiece, located on the stage, is cooled artificially, and a normal load of several mN is applied by the micro PCD tool for the micro scale cutting process. The machining results indicated considerably different machinability when the work was performed at sub-0℃, as opposed to the ambient surface temperature, due to the changed mechanical characteristics of surface by the forced cooling of the workpiece. Although the normal load, machining speed, and machining area remained constant, the width and depth of the patterns significantly increased at sub-0℃ temperature conditions.
An analysis of consultations requested to a pain clinic
윤준로,정상록,정수연,윤혜진,김태관,김의숙 대한마취통증의학회 2016 Anesthesia and pain medicine Vol.11 No.2
Background: The study investigated in detail the current status of the consultations requested in a pain clinic. We evaluated the characteristics of the consultations to determine the kind of contents requested, referring departments and factors including demographics, co-morbidities, previous medical problems, and the descriptions of the reasons for the consultation to the pain clinic. Methods: Clinical data were collected in the authors’ institution between 1 January 2009 and 31 December 2013. The medical records were reviewed and compared. Characteristics of both outpatients and inpatients were analysed. Results: Data from 1,140 patients was available for this study. Seven hundred thirteen individuals belonged to the outpatient group and 427 individuals belonged to the inpatient group. Orthopedic surgery, neurosurgery, and otolaryngology were the main departments that requested consultations to the pain clinic. The most frequent requested lesion and diagnostic term were low back and lumbar spinal stenosis, respectively, and the most common reason for consulting was for “control of pain not controlled by medications.” Factors that were significantly different between the two groups were gender, questions about other illnesses apart from the main diagnoses, history of specific diseases, acute onset, cancer, operation within 3 months, and physical system abnormalities. Conclusions: The medical problems addressed by a pain clinic consultation service were diverse. It is rational to develop standardized guidelines for pain consultations, and treatment strategies aimed at alleviating pain per se as well as caring for comorbid conditions.