비선형 육상 이동 위성방송 환경에서 DS-CDM-SQAM의 성능 연구

김선준,이영진,홍영진,서종수 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.5A

In this paper, we p개pose DS-CDM-SQAM(Superposed Quadrature Amplitude Modulation) which is characterized by its smooth phase transition and small envelope fluctuation, and improves the power efficiency as compared to DS-CDM-QPSK of satellited-based DMB system(ITR-R BO.1130-4 System E) in a nonlinearly amplified channel. Computer simulation results show that the proposed DS-CDM-SQAM improves Eb/No by 1.7㏈ to maintain BER=1${\times}$$10^{-3}$ in nonlinearly amplified multipath mobile radio environments. Therefore, the proposed DS-CDM-SQAM system significantly improves the power efficiency in nonlinear land mobile satellite DMB environments.

내부서비스품질이 고객만족과 기업성과에 미치는 영향에 관한 연구

김선준 대한경영정보학회 2004 경영과 정보연구 Vol.15 No.-

The purpose of this paper is on employees as internal customers and the critical role this group plays in the delivery of quality results. The set up of research model for verification was as follows. The research model was drawn as internal service quality level internal customer satisfaction enterprise outcome. Then, two hypotheses were established to the research model. Through the factor analysis and multiple regression analysis, the results are as follows. First, internal service quality level turned out to be affected indirectly through internal customers' satisfaction rather than a direct factor to affect the enterprise outcome. Second, internal customers' satisfaction was proved to be the most important factor for the enterprise outcome as ti was the intimate factor precedent to the enterprise outcome. However, there could be a variation of response according to the personal circumstances of respondents since the respondents were from different enterprises and consisted various job positions and age group. Namely it included a limitation of rather unaccurate resulting values because the transverse methods were performed for convenience though it needed a longitudinal research to accomplish the general purpose of this study.

2-4 cell 리튬이온 멀티 배터리 보호회로 Analog Front End(AFE) IC 설계

김선준,김준식,박시홍,Kim, Sun-Jun,Kim, Jun-Sik,Park, Shi-Hong 한국전기전자학회 2011 전기전자학회논문지 Vol.15 No.4

휴대 기기가 고기능화, 다기능화 됨에 따라 다양한 멀티미디어 기능이 요구되면서 배터리를 보다 장시간 이용하면서 더 높은 전력과 에너지가 요구되고 있다. 이에 따라 여러 개의 리튬이온 cell을 연결한 배터리팩이 많이 사용되고 있다. 2개 이상의 cell로 구성된 리튬이온 배터리를 안전하게 사용하기 위해서는 과전압 및 과전류, 고온으로 부터 보호해야 됨은 물론, 수명을 연장하기 위해서 각 cell의 전압을 같게 유지시켜주는 balancing 기능이 반드시 요구된다. 본 논문에서 제안한 IC는 모바일 기기뿐만 아니라 E-bike, 하이브리드 자동차, 전기 자동차 분야에도 적용 가능할 것으로 예상되며, 국내 PMIC 발전에 기여할 것으로 기대된다. In recent years, the performance and functions of portable devices has increased. so it requires more power efficiency and energy density while using the battery for a long time. therefore Battery pack which are made up from several battery cells in series in order to achieve higher operating voltage is being used. when using a Li-ion battery, we need a protection circuit to protect from overcharge, over discharge, high temperature and over current. Also, when using battery pack, we need to Cell voltage balancing circuit that each cell in tune with the balancing. In this paper, the proposed IC is applicable by mobile devices as well as E-bike, hybrid vehicles, electric vehicles, and is expected to contribute to the development of domestic PMIC.

전자상거래에서의 물류서비스품질(LSQ)에 관한 연구

김선준,박득 한국정보기술응용학회 2002 한국정보기술응용학회학술대회 Vol.2002 No.1

본 연구에서는 전자상거래의 발달과 더불어 새롭게 부각되고 있는 인터넷 쇼핑몰의 물류서비스 품질이 인터넷 쇼핑몰의 이용자들의 만족에 어떠한 영향을 미치고 있는지 알아보았다. 이에 Mentzer 외(1955)가 개발한 물류서비스품질 척도와 기존에 물류서비스 관련 선행연구에서 사용된 물류서비스 요인들을 이용하여 인터넷 쇼핑몰의 특징을 반영한 물류서비스 품질요인들을 추출하여 이를 실증적으로 검증해 보았다.

Layered Hierarchical Nb₂O<SUB>5</SUB>/carbon@Nb₄C₃ MXene Core-Shell Composite for Energy Storage Devices

김선준,Chuanfang Zhang,Yury Gogotsi,정희태 한국고분자학회 2015 한국고분자학회 학술대회 연구논문 초록집 Vol.2015 No.10

차세대 나노 신소재와 함께하는 미래

김선준 한국전기전자재료학회 2022 전기전자재료 Vol.35 No.2

녹차 용매추출물의 담수어류 질병세균 Aeromonas hydrophila에 대한 항균효과

김선준,황재호,라성주,이시우,?이원교,한경호,김선재 전남대학교 수산과학연구소 2013 수산과학연구소논문집 Vol.21 No.-

Antimicrobial effect of green tea extract against pathogenic bacteria, Aeromonas hydrophila was examined by in vitro antimicrobial activity and minimum inhibitory concentration. Among three additives (ethanol extract, neutral and acidic solvent-fractions) from green tea, the neutral fraction of green tea extract showed the highest inhibitory effect in a dose dependent manner. Moreover, scanning electron micrograph examined that neutral fraction of green tea extract could lead to cell membrane breakdown on A. hydrophila showing antimicrobial effect.

전북지역의 급성 류마치열 환아의 임상적 고찰

김선준,주찬웅,고재기 의과학연구소 1991 全北醫大論文集 Vol.15 No.4

Rheumatic fever is an inflammatory disease of the heart, joint, central nervous system, skin, and subcutaneous tissue. It is a nonsuppurative complication of group A streptococcal nasopharyngeal infections. The indicence of rheumatic fever continues to steadily decline in developed countries, but it is still a major problem in developing countries. So we undertook a retrospective chart analysis of the incidence, clinical manifestation, and laboratory findings among 62 patients of rheumatic fever and rheumatic carditis in children of the Chonbuk area during the 10-year period from 1981 to 1990. The following results were obtained : 1) Major manifestations were carditis(88.7%), polyarthritis(25.8%), subcutaneous nodule(9.7%), erythema marginatum(4.8%), and chorea(4.8%). 2) The involved valves in 55 patients with carditis were mitral(100%), aortic(21.8%), and tricuspid valve(10.9%), However pulmonary valve was not involved. The incidence of pericarditis was 12.7%. 3) Sites of involved joints in 24 patients with arthritis and arthralgia included knee(75.0%), ankle(54.2%), wrist(29.2%), hip(20.8%), and shoulder joint(16.7%). 4) Abnormal laboratory findings were increased ASO titer(≧250 Todd Unit) (89.1%), ESR(≧30mm/hr)(71.0%), positive CRP(64.5%), leukocytosis(54.8%), and anemia(Hgb≦10gm%)(19.4%) 5) Abnormal EKG findings were tachycardia(46.8%), PR prolongation(30.6%), QTc prolongation(46.8%), LVH(14.5%), flat T wave(14.5%), and PVC(4.8%) 6) 20 patients in 62 with rheumatic fever(32.3%) had recurrences more that one times.

SIP UA 기반 착선 전환 및 금지 설계에 대한 연구

김선준,김정호 한밭대학교 2007 한밭대학교 논문집 Vol.5 No.1

본 연구에서는 SIP기반으로 착신 전환 및 금지 기능을 제안하고 설계한다. 인터넷 전화는 음성통 화를 기존 전화망이 아닌 인터넷을 통해 이용할 수 있는 새로운 통신 기술로 인터넷 전화를 이용하면 거 리에 제약 없이 전화 서비스를 적은 비용으로 이용할 수 있으며, 확장된 멀티미디어 서비스가 가능하다. 인터넷 전화가 기존 전화망을 대체하기 위해 품질 개선, 과금 문제, 부가서비스 기능 등이 해결되어야 한 다. 이에 본 연구에서는 SIP-Working Group에서 제안한 인터넷 전화 접속관리 프로토콜 SIP(Session Initiation Protoc이)를 이용하여 부가서비스로 활용 가능한 통화 관련 기능 중 착신 전환 기능과 자동 연 결 기능, 사생활 관련 기능 중 착신 금지 기능과 개별 통화 수신 거부 기능을 SIP UA(User Agent) 기반 으로 제안하고 설계 하였다. Internet phone service is a new service technology that provides voice call services through Intemet not through the pre-existing PSTN. It enables a cheap voice call service regardless of distance. We may expect that the 1ntemet phone service may substitute for the voice call service through the PSTN, but not in a short period. There are several problems to be solved for this transition, such as, voice call quality, numbering scheme, billing, standardization, and support of several auxiliary services. In this paper, we provided and designed a UA (User Agent) that can support auxiliary service regarding voice call, such as call forwarding, auto-connection, call rejection and restriction of individual call, using SIP (Session Initiation Protocol) which is proposed by SIP-Working Group as the standard Intemet phone service management protocol

Large-Area Mechanical Exfoliation, Transfer of Graphene on Ni to Target Substrates with Recycled Catalyst Use

김선준,김대우,정희태 한국고분자학회 2015 한국고분자학회 학술대회 연구논문 초록집 Vol.2015 No.4