모바일 통신 단말기를 위한 벡터 그래픽스 커널 개발

이환용,박기현,우종정,Lee Hwan-Yong,Park Kee-Hyun,Woo Jong-Jung 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.6

모바일 통신 단말기의 급속한 발전과 다양한 사용자들의 요구로 인하여, 이미지 정보를 포함한 멀티미디어 정보가 모바일 통신에서 컨텐츠의 기반을 이루고 있다. 전송 지연시간과 경비를 고려할 경우에 비트맵 방식 보다 유리한 벡터 그래픽스 방식의 이미지 정보를 효율적으로 이용하기 위해서는 효율적인 벡터 그래픽스 지원 시스템이 필요하다. 따라서, 많은 벡터 그래픽스 커널 시스템들이 제안되고 있으며, 호환성을 높이기 위하여 벡터 그래픽스 커널에 대한 표준화 작업이 진행되고 있다. 본 논문에서는 자원 제한적인 모바일 단말기에 적합한 벡터 그래픽스 커널의 요구 사항을 살펴보고, 표준으로 제안된 Khronos Group의 OpenVG 기반 벡터 그래픽스 커널을 설계 구현한다. 또한, 구현된 그래픽스 커널을 검증하기 위하여 PC 에뮬레이터 환경과 ARM 탑재 개발보드 환경에서 각각 포팅 한 후, 성능을 측정한다. Due to rapid development of mobile communication terminals and various requests of their users, multimedia information including image information has been the basis of mobile communication contents. In order to use vectored image information efficiently, which is more favorable than bit-mapped image information when transmission delay time and costs are considered, efficient vector graphics supporting systems are needed. Therefore, vector graphics kernel systems have been proposed and standardization attempts have been made in order to increase interoperability. In this paper, a vector graphics kernel based on OpenVG is designed and implemented. OpenVG was proposed as a standard vector graphics kernel by Khronos Group recently. The implemented vector graphics kernel, named by alexVG, is developed on a PC emulator as well as on a development board equipped with an ARM processor. In addition, performance tests are made in order to verify its functions.

OpenGL을 이용한 OpenGL ES 1.1 구현

이환용,백낙훈,Lee, Hwan-Yong,Baek, Nak-Hoon 한국정보처리학회 2009 정보처리학회논문지 A Vol.16 No.3

본 논문에서는 데스크탑과 같이 OpenGL 기능이 전용 하드웨어로 제공되는 환경을 대상으로, OpenGL ES 1.1 표준을 효율적으로 구현하는 방법을 제시한다. OpenGL ES는 기존의 OpenGL 표준을 바탕으로 하였지만, 고정소수점 연산, 이를 수용하는 버퍼 기능, 완전히 새로운 텍스처 처리 등의 도입으로, 임베디드 시스템에 특화된 3차원 그래픽스 라이브러리로 새롭게 제정되어, 구글 안드로이드, 애플 아이폰, 플레이스테이션3 등에서 공식 3차원 그래픽스 API로 채택되었다. 본 논문에서는 OpenGL ES의 특징적 자료형인 고정소수점 표현에 대한 산술 연산들을 개선하였고, 특히 고정소수점 자료형들을 부동소수점 형태로 변환하여 하위의 OpenGL API로 넘기는 과정에서 표준을 준수하면서도 효율적인 처리가 가능하도록 하였다. 새로 도입된 고정소수점 자료형을 허용하는 버퍼 기능에 대해서는 변환된 자료들을 별도의 메모리 공간에서 관리하는 방식으로 속도 향상에 중점을 두었으며, 요구 사항이 완전히 달라진 텍스처 처리 부분은 전체 기능을 별도의 소프트웨어로 완전히 새롭게 구현하였다. 최종 구현 결과인 OpenGL ES 라이브러리는 OpenGL ES 1.1 표준에 규정된 총 200여 함수를 제공하며, 표준인증 테스트를 완전히 통과하여 1.1 표준을 완벽히 만족시켰음을 보였다. 수행 속도 면에서는 OpenGL ES에 특화된 응용 프로그램들에 대한 처리 속도 측정에서 기존의 구현 사례들에 비해 최대 33.147배의 속도 향상을 가져왔으며, 동일한 범주의 구현 사례들 중에서 가장 빠른 구현 결과이다. In this paper, we present an efficient way of implementing OpenGL ES 1.1 standard for the environments with hardware-supported OpenGL API, such as desktop PCs. Although OpenGL ES was started from the existing OpenGL features, it becomes a new three-dimensional graphics library customized for embedded systems through introducing fixed-point arithmetic operations, buffer management with fixed-point data type supports, completely new texture mapping functionalities and others. Currently, it is the official three dimensional graphics library for Google Android, Apple iPhone, PlayStation3, etc. In this paper, we achieved improvements on the arithmetic operations for the fixed-point number representation, which is the most characteristic data type for OpenGL ES. For the conversion of fixed-point data types to the floating-point number representations for the underlying OpenGL, we show the way of efficient conversion processes even with satisfying OpenGL ES standard requirements. We also introduced a simple memory management scheme to mange the converted data for the buffer containing fixed-point numbers. In the case of texture processing, the requirements in both standards are quite different and thus we used completely new software-implementations. Our final implementation result of OpenGL ES library provides all of over than 200 functions in OpenGL ES 1.1 standard and completely passed its conformance test, to show its compliance with the standard. From the efficiency viewpoint, we measured its execution times for several OpenGL ES-specific application programs and achieved at most 33.147 times improvements, to become the fastest one among the OpenGL ES implementations in the same category.

서비스산업에서 접객직원들의 핵심자기평가가 서비스회복성과에 미치는 영향

이환용(Lee, Hwan Yong),이동현(Lee, Dong Hyun),박종훈(Park, Jong-Hun) 한국서비스경영학회 2014 한국서비스경영학회 학술대회 Vol.2014 No.11

The purpose of this study is to investigate the effects of the core-self evaluation(CSE) on the both service recovery performance(SRP) and job satisfaction(JS), to also examine the mediation mechanism of JS, and moderation effect of perceived supervisor support(PSS) for the relationship between CSE and SRP as well as relationship between CES and JS. More specifically, we propose that CSE has a positive effect on the both SRP and JS, and that JS mediates the relationship between CSE and SRP. Further, we propose that PSS strengthens such relationships between CSE and SRP as well between CSE and JS. The results from the sample of 241 front-line staffs in the service industries generally confirm our hypotheses excepting for moderation effect on the relationship between CSE and JS. Our findings imply that the employee trait such as CSE influences a job attitude for job satisfaction and job performance for service recovery performance and that the job performance effect of CES depends on PSS across employees.

서비스산업에서 접점직원들의 핵심자기평가가 서비스회복성과에 미치는 영향

이환용(Lee, Hwan Yong),이동현(Lee, Dong Hyun),박종훈(Park, Jong Hun) 한국서비스경영학회 2014 서비스경영학회지 Vol.15 No.5

The purpose of this study is to investigate the effects of the core-self evaluation( CSE) on the both service recovery performance(SRP) and job satisfaction(JS), to also examine the mediation mechanism of JS, and moderation effect of perceived supervisor support(PSS) for the relationship between CSE and SRP. More specifically, we propose that CSE has a positive effect on the both SRP and JS, and that JS mediates the relationship between CSE and SRP. Further, we propose that PSS strengthens such relationships between CSE and SRP. The results from the sample of 241 front-line staffs in the service industries generally confirm our hypotheses excepting for moderation effect on the relationship between CSE and JS. Our findings imply that the employee trait such as CSE influences a job attitude for job satisfaction and job performance for service recovery performance and that the job performance effect of CES depends on PSS across employees.

토지정보관리체계의 수치지형정보에 활용되는 보간법에 대한 비교연구

이규석(Kyoo-seock Lee),이환용(Hwan-yong Lee),서혜진(Hye-Jin Seo) 한국측량학회 1990 한국측량학회지 Vol.8 No.2

불규칙 삼각망 최적화 알고리즘을 이용한 비행경로 가시화 시스템의 구현

최희준(Heejun Choi),이환용(Hwan-yong Lee),박찬모(Chan-Mo Park) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.1A

본 논문은 적의 위협과 지형방해물을 고려한 비행경로를 지형데이타(DEM)를 이용하여 3차원으로 가시화시켜주는 비행경로시스템을 구현하여 조종사의 브리핑에 이용함으로써, 사전에 공격경로를 인지케하여 임무의 효과를 극대화하는데 목적이 있다. 먼저 계산기하학의 보로노이 다이아그램을 이용하여 지형을 3차원으로 모델링하고, 가상적의 영토안에 위치한 고정된 적의 위협과 지형방해물을 고려한 목표물까지의 최적비행경로를 구하며, 다양한 그래픽기법을 이용하여 비행경로를 실시간으로 가시화한다.

심리적 임파워먼트, 서비스회복성과 및 이직의도에 대한 연구

박종훈(Park, Jong-Hun),이동현(Lee, Dong-Hyun),이환용(Lee, Hwan Yong) 한국서비스경영학회 2015 서비스경영학회지 Vol.16 No.5

The purpose of this paper is to examine the conditions which increase the service recovery performance and decrease the intention to turnover of frontline staff in the service industries. Our study considers the psychological empowerment and the supervisor support as such conditions. We argue that the psychological empowerment has a positive relationship with the service recovery performance. We also propose the supervisor support strengthens such a relationship. We further argue that service recovery performance mediates between the psychological empowerment and the intention to turnover of frontline staff. The results from our sample of 261 frontline staff in various service industries generally confirm our arguments. We discuss the implications of our findings and the direction for further studies.

권한위양, 서비스회복성과 및 이직의도에 대한 연구

박종훈(Park, Jong-Hun),이동현(Lee, Dong-Hyun),이환용(Lee, Hwan Yong) 한국서비스경영학회 2015 한국서비스경영학회 학술대회 Vol.2015 No.5

The purpose of this paper is to examine the conditions which increase the service recovery performance and decrease the intention to turnover of frontline staff in the service industries. Our study considers the empowerment and the supervisor support as such conditions. We argue that the empowerment has a positive relationship with the service recovery performance. We also propose the supervisor support strengthens such a relationship. We further argue that service recovery performance mediates between the empowerment and the intention to turnover of frontline staff. The results from our sample of 261 frontline staff in various service industries generally confirm our arguments. We discuss the implications of our findings and the direction for further studies.

靑皮가 CCL₄로 誘發된 Rat의 肝損傷에 미치는 影響

李桓容,河智容 尙志大學校 1996 論文集 Vol.17 No.-

This study was proposed to investigate the effect of Chungpi extract on the recovery from liver injury in CCL₄-intoxicated rats. For this study, Sprague-Dawley rats were divided into 3 experimental group : control group, DDL₄-intoxicated group, group treated with Chungpi extract after CCL₄-intoxcation. Biochemical assays serum emzyme activity of G.O.T., G.P.T., d-dilirubin were performed. The resurts obtained are summarized as follows: 1. In macroscopic observation, Chungpi treated group was clear than CCL₄-intoxicated group. 2. Chungpi treated group showed significantly lower serum G.O.T. activity than CCl₄-intoxicated group. 3. Chungpi treated goup showed lower serum G.P.T. activity than CCL₄-intoxicated group, but no significant. 4. Chungpi treated group showed significantly lower serum d-Bilirubint activity tna CCL₄-intoxicated group. From above results, it is suggested that Chungpi has a valid and curative effects on the recovery from liver injury.