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강재신(Jaesin Kang),김재원(Jaewon Kim),안은영(Eunyoung Ahn) 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.8
This research is for the visualization of wooden cracking phenomena in the virtual world. Timber supplies has been traditionally used for buildings in the all over the world. Wood has a characteristic that is more prone to be influenced and distorted under the external environments compared with other materials like as stone and concrete. Many related researches say that moisture content change is a largest impact factor for the distortion and crack of timber supplies. This is the reason why we focus on the relationship between the moisture variations and the wood distortion, especially crack. In this research, it is mathematically explained that the diminutions of tensile strength caused by repeated contraction and expansion according to the moisture variations under the changes of weather. Finally, we suggest a way to visualize it for pine timbers.
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소셜VR플랫폼의 사용성 분석 -아바타, 환경, 상호작용 및 소통을 중심으로-
강재신 ( Kang Jae-shin ),강태임 ( Kang Tae-yim ) 커뮤니케이션디자인학회(구 시각디자인학회) 2019 커뮤니케이션 디자인학연구 Vol.69 No.-
본 연구는 소셜VR플랫폼의 사용성에 영항을 미치는 요인과 요인들 사이의 상관관계를 파악하기 위해 사용성 분석을 실시하는 데 목적이 있다. VR시장 변화와 소셜VR플랫폼 활용 사례에 대한 선행연구를 통해 소셜VR플랫폼의 특징을 파악하고, 국제 표준 기구의 소프트웨어 품질 평가와 Jacob Nielsen이 정의한 사용성 평가에 관한 문헌조사에 근거하여 소셜VR플랫폼 사용성 평가기준을 제시하였다. AltspaceVR, VRChat, Sansar, High Fidelity, Facebook Spaces의 사용자를 대상으로 Contextual Inquiry기법을 이용해 소셜VR플랫폼의 사용성을 아바타, 의사소통, 상호작용, 환경에 따라 평가요인별로 비교 분석 하였다. 연구 결과, 상관관계에 있어서는 아바타와 상호작용의 경험성은 효과성에 비례하고, 아바타의 효율성과 경험성은 비례한 반면, 상호작용의 효율성과 경험성은 상관관계를 형성하지 않았다. 5개의 소셜VR플랫폼 모두 아바타와 상호작용에서의 오류와 늦은 복구 속도, 환경에서의 낮은 효과성과 효율성은 소셜VR플랫폼 사용성에 부정적인 영향을 미쳤으며 향후 소셜VR플랫폼 제작 시 개선되어야 할 부분이다. The purpose of this paper is to identify the correlation between factors and factors that affect the usability of social VR platform. The characteristics of the social VR platform have been confirmed in previous studies. In order to set the criteria for usability of the social VR platform, we consulted the literature on ISO software quality assessment and Jacob Nielsen's usability assessment. The assessment items for usability testing of AltspaceVR, VRChat, Sansar, High Fidelity, and Facebook Spaces are avatar, communication, interaction, and environment. The results show that the experience of avatars and interactions is proportional to effectiveness, and the avatar efficiency and experience were proportional, whereas the interaction efficiency and empirical relationship were not correlated. In all five social VR platforms, the error of interaction with the avatar and late recovery speed, low effectiveness and efficiency in the environment had a negative impact on the usability of the social VR platform.
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1998 / 1999 남극 킹조지섬 마리안소만 표층수에 서식하는 미세조류의 계절적 변동
강재신(Jae Shin Kang),강성호(Sung Ho Kang),이진환(Jin Hwan Lee),최돈원(Don Won Choi),이상훈(Sang Hoon Lee) 한국환경생물학회 2000 환경생물 : 환경생물학회지 Vol.18 No.1
We investigated seasonal variation of microalgal assemblages, sea water temperature, salinity and suspended solid and the parameters measured daily from January 1998 to October 1999 at a nearshore shallow-water in Marian Cove, Maxwell Bay, King George Island, the Antarctic. Annual mean surface water temperature was -0.30℃ and the highest water temperature was 4.53℃(22 January 1999) and the lowest water temperature was -2.07℃(23 August 1998). Annual mean salinity was 33.38 psu, ranging from 42.80 psu(6 January 1999) to 19.50 psu(6 June 1999). Annual mean suspended solid(SS) during two years was 34.14 ㎎·1^-1, ranging from 60.62 ㎎·1^-1(7 March 1998) to 12.90 ㎎·1^-1(26 December 1998). Chlorophyll α(Chl α) concentrations were measured in order to know seasonal variations of microalgae in the surface seawater. Annual mean of total Chl a concentration was 0.55 ㎍·1^-1, the highest Chl α concentration(12.16 ㎍·1^-1) appeared in 4 October 1998, the lowest Chl α concentration appeared 0.19 ㎍·1^-1. Monthly mean total Chl a concentration was high in October 1998(1.32 ㎍·1^-1) and low in July on 1998(0.28 ㎍·1^-1). Annual mean nano-sized Chl α concentration was 0.40 ㎍·1^-1, monthly mean nano-sized Chl α concentration was high in November 1998(0.90 ㎍·1^-1), and low in July 1999(0.22 ㎍·1^-1). Annual mean micro-sized Chl α concentration was 0.15 ㎍·1^-1, monthly mean micro-sized Chl α concentration was high in October 1998(0.81 ㎍·1^-1), and low July 1998, January, February and September 1999(0.05 ㎍·1^-1). More than 65% of total Chl α was concentrated during spring and summer time between October and March. Microalgal variation appeared to be due to physical factors of seawater in the Antarctic nearshore from 1998 to 1999. The reason why micro-sized Chl α did not increase during austral summer was the bay had been frozen by decrease of water temperature. We think that total microalgal abundance was decreased because the summer microalgal abundance was determined by variation of water temperature during winter season. [Chl α concentration, Microalgal assembalges, Seasonal variation, the Antarctic nearshore].
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멀티미디어 실습 온라인강의 학습참여에 영향을 주는 콘텐츠 구성요소 분석
강재신(Kang, Jae Shin),강태임(Kang, Tae Yim) 한국디자인문화학회 2020 한국디자인문화학회지 Vol.26 No.4
현재 코로나19 팬데믹으로 인해 대학의 강의들은 온라인 비대면 강의로 전환되고 있다. 이와 같은 교육의 패러다임이 변화하고 있는 시대적 상황에서 대학의 교강사들은 대부분 전문가의 도움이나 정확한 매뉴얼 없이 비대면 온라인강의를 위한 콘텐츠를 스스로 제작, 배포하면서 교수자들의 역할이 더욱 커지고 있다. 교수자들은 학습자의 참여도를 높일 수 있는 온라인강의 콘텐츠를 제작하는 것이 중요하다. 이런 이유에서 온라인강의 콘텐츠의 멀티미디어 요소 중에 학습자의 참여에 영향을 주는 요인들을 파악할 필요가 있다. 본 연구의 목적은 학습참여에 영향을 주는 요인들을 분석하여 실습 교과목 온라인강의 콘텐츠의 학습참여 효과를 높이는 것이다. 먼저 온라인강의를 통한 학습참여 효과를 측정하기 위해 커뮤니케이션과 유의한 관계에 있는 멀티미디어 요소에 의해 온라인 강의 콘텐츠를 유형화하고, 선행연구를 기반으로 평가항목을 설계하였다. 다음으로 멀티미디어 실습 교과목의 온라인강의 수강자에게 세 가지 유형의 온라인강의를 제공하고, 각각 유형별로 콘텐츠를 시청한 수강자를 대상으로 설문을 진행하였다. 설문 조사 결과 교수자 요인, 학습자 요인, 환경적 요인에 따른 학습참여 효과를 파악할 수 있었다. 멀티미디어 실습 교과목의 온라인강의 콘텐츠에서 학습 이미지의 화면 비율은 확대하는 것이 학습참여에 효과적이고, 교수자는 학습자가 강의에 몰입할 수 있도록 삽입하는 것이 좋지만, 화면에서 교수자 동영상이 차지하는 비율은 40% 미만으로 축소하는 것이 학습 내용을 이해하는데 더 효과적인 것으로 파악되었다. 자막은 슬라이드 화면의 텍스트로 대체하는 경우를 제외하고는 삽입하는 것이 학습자가 학습 내용을 파악하는 데 더 효과적이었다. The purpose of this study is to increase the learning participation effect of online lecture contents for practical subjects by analyzing factors that affect learning participation. Currently, due to the Corona 19 pandemic, university lectures are being converted to online non-face-to-face lectures. In this time when the paradigm of education is changing, most of the university lecturers are creating and distributing contents for non-face-to-face online lectures without the help of experts or accurate manuals. Instructors need to identify factors that can increase learners’ participation in online lectures and create lectures that take them into account. For this reason, this researcher attempted to identify the factors that influence learners’ participation among the elements of online lectures. In this paper, in order to measure the learning participation effect of online lectures, online lecture contents are categorized by multimedia elements that have a significant relationship with communication of online lectures, and evaluation items are designed based on previous studies. In order to measure the effect of learning participation, the researcher provided three types of lecture contents to participants of multimedia training courses, and conducted a questionnaire targeting those who watched each type of contents. As a result of the survey, the effect of learning participation according to the instructor factor, learner factor, and environmental factor was identified. Enlarging the aspect ratio of the learning image in the online lecture contents of the multimedia training course is effective for participation in learning. It is recommended that the instructor insert it so that the learner can be immersed in the lecture, but it is more effective to reduce the percentage of the instructor video on the screen to less than 40%. Inserting subtitles was more effective for learners to grasp the learning content, except when subtitles were replaced with text on the slide screen. This study has the implications of the study in that it helps to create effective lecture contents for learning participation by grasping the correlation between the multimedia factors of online lecture contents and the effect of participation in learning.
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무선환경에서 연속적인 패킷손실을 고려한 TCP 재전송 기법
홍충선,강재신,김대선,Hong Choong Seon,Kang Jae-sin,Kim Dae-sun 한국정보처리학회 2004 정보처리학회논문지 C : 정보통신,정보보안 Vol.11 No.7
무선환경상에서 TCP는 유선과는 달리 비트 에러율을 가지기 때문에 이를 해결하기 위한 TCP가 필요하다. 위성망 같이 손실률이 매우 놓은 환경을 위해 TCP Westwood에서는 기존의 벌크 재전송(bulk retransmission) 기법을 보완하였다. 하지만 벌크 재전송 기법은 불필요한 데이터도 함께 재전송하기 때문에 무절제한 패킷 전송으로 인해 혼잡을 가중시킬 우려가 있으며 또한 손실률이 높지 않은 네트워크 환경에서는 전송속도가 낮아진다. 본 논문에서는 네트워크 상황에 따라 Bulk 재전송 패킷수를 조절하는 적응 벌크 재전송 메커니즘 (adaptive bulk retransmission mechanism)을 제시하였고 Markov 에러 모델에서 기존의 TCP Westwood보다 높은 전송 속도를 보임을 NS-2를 이용하여 검증하였다. We need to have an adaptive TCP protocol that can be tolerable on wireless network environement. TCP Westwood for use in the environe-ment that have a very high loss rate like a sattelite was proposed by modifying the existing bulk retransmission protocol. Bulk retransmission mechanism shows a highly enhanced performance on networks that have a very high loss rate but are prone to bursty loss networks. Also, it can exprience less performance on low late transmission environement. This paper proposes Adaptive Bulk Retransmission Mechanism that adjusts the number of bulk retransmitted packets based on the network conditions. The proposed mechanism was evaluated by using NS-2.
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남극 호냉성 미세조 Porosira pseudodenticulata의 형태와 분자적 자료
정웅식,주형민,홍성수,강재신,최한구,강성호,Jung, Woong-Sic,Joo, Hyoung-Min,Hong, Sung-Soo,Kang, Jae-Shin,Choi, Han-Gu,Kang, Sung-Ho 한국조류학회(藻類) 2006 ALGAE Vol.21 No.2
We have cultured more than 100 Arctic and Antarctic cryophilic microalgal strains in KOPRI culture collections of polar microorganisms (KCCPM). Among them, we tried to identify an Antarctic strain, KOPRI AnM0008 by morphological and molecular analysis. Nuclear SSU rDNA and plastid rbcL sequences were used to identify the strain. It was identified as Porosira pseudodenticulata based on SSU sequence data showing 99% identity with GenBank X85398. This result was supported by morphological features like solitary labiate process, external foramina and internal cribra by optical and scanning electron microscope. Morphological identification and molecular analysis on polar cryophilic microalgae will be accomplished to construct the databases for KCCPM.
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