• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.353-354
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• 2012

최근 입체영상구현 기술연구는 현실감 있는 영상을 제작하기 위해서 다양하고 새로운 영상 제작방법들이 시도되고 있다. 하지만 입체영상 재현의 기술적 문제에 집중되어 있고 3D 그래픽스를 기반으로 한 입체영상 제작 기술에 관한 연구는 부족한 실정이다. 또한 그래픽스 환경에서 입체영상콘텐츠에 대한 입체감을 극대화 할 수 있는 기법이 필수적이다. 따라서 본 연구는 3차원 입체영상을 제작하는 과정에서 그래픽스 환경에서 실재감 있는 영상을 제작하기 위한 다양한 입체제작 원리와 제작을 활용한 영상보정 기법을 사용하여 키스톤 왜곡에 대한 현상을 보정하고 구현 가능한 제작방법을 제시하였다.

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.3
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• pp.39-48
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• 2007

The stimulus of accommodation A, the stimulus of convergence C and the prism diopter ${\Delta}$ are reviewed and redefined more obviously. How the A and C are managed in the practice are reviewed and summarized. As a result, the common practical process of the binocular vision findings is most suitable in the case of the $l_c=26.67mm$, where the near distance is measured from the test lens to the near target and its value is 40 cm and the average of the P.D equal to 64 mm. The $l_c$ is the distance between the test lens and the center of rotation. Those values were used at calculating the various values in this paper. The error of the stimulus of accommodation values which are evaluated by the practically used formula (5) are calculated. Where the distance between lens and the principle point of eye is 15.07 mm ($=l_H$). The incremental stimulus of convergence values P' caused by the addition prism $P_m$ are evaluated by the recursion computation method. The P' are varied with the $P_m$, the distance $p_c$ between the prism and the center of rotation, the initial convergence value (or inverse target distance) $C_o$ and the refractive index n of the prism material. The recursion computation method and the other formulas are described in detail. In this paper n=1.7 is used. The two factors by which the P' is increased are exist. The one which is major is the property by which the values of convergence whose unit is ${\Delta}$ are not added in the generally way. The other is the that the actual power of the prism is varied with the angle of incidence light. And the P' is decreased remarkably by an increase in the $p_c$ and $C_o$. The $P^{\prime}/P_m$ are calculated and graphed which are varied with the $p_c$ and $C_o$, where the $P_m=20{\Delta}$, P.D=64 mm and n=1.7. The index n dependence of the $P^{\prime}/P_m$ is negligible (refer to fig. 6). The $p_c$ are evaluated at which the P' equal to the $P_m$ for various $P_m$ (refer to table 1). The actual values of the stimulus of convergence and accommodation which are manipulated simply in the practice are calculated. Two graphical forms are suggested. The one is like as the commonly used one. But the stimulus of convergence and of accommodation values in the practice are positioned at the exact positions when the graphic is made (refer to fig. 9). The other is the form that the incremental stimulus of convergence values caused by the addition prisms are represented at actual positions (refer to fig. 11).

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.2
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• pp.219-228
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• 2015

Purpose: The current study was performed to compare the difference in binocular visual function depending on variable background colors at near work. Method: Fifty four adults (18 males, 34 females) who consented to the present study and had no ocular disease, ocular surgery history, strabismus and amblyopia with normal binocular vision were participated into this study. The subjects were asked to read the novels with black letter printed on white, red, green and blue background for 15 min. Then, their heterophoria, AC/A ratio, near point of convergence, accommodation facility, relative accommodation and vergence were measured before and after reading. The difference of measurements were compared. Result: Overall heterophoria was tended to decrease with regardless of background color. AC/A ratio showed a tendency of increase after reading the novels with all backgrounds except white background. Near point of convergence was significantly increased compared to before reading at all background color. Accommodative facility of dominant and non-dominant eyes were also significantly increased after reading however, binocular accommodative facility showed a tendency of decrease. Negative relative accommodation also decreased at all background colors however, the change of positive relative accommodation was not significantly different. In case of vergence, there was significant difference in break point of far BO and recovery point of far BI by the wavelength of background color. Conclusions: From the results, it was known there is convergence change depending on the wavelength of light even though same amount of accommodation and convergence is required when doing near work for certain period. Thus, it can be suggested that the adjustment of the near working environment which perception of various color was required, should be conducted according to the main wavelength.

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.2
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• pp.229-235
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• 2015

Purpose: This study was undertaken to study on visual function before and after prescription of vertical prism. Methods: 80 subjects (10-30ages) who had been precribed vertical prism and 1 year after they were represcribed vertical prism. Results: Phoria (p=0.000), supra vergence (p=0.000), NPC (p=0.003), NPA (right eye) (p=0.005), NPA(left eye) (p=0.000) showed a significant change. Conclusion: Vertical prism prescription was reduced during revisit. Supra vergence, NPC, NPA(right eye), NPA(left eye) showed a significant change. Binocular Accommodative lag was not associated with vertical prism prescription and binocular vision findings.

• The KIPS Transactions:PartC
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• v.9C no.1
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• pp.65-72
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• 2002

In this paper, we implement a high-speed swatch tilth the function for label integration to enhance the expansion of networks using the label space of routers efficiently on MPLS over ATM networks. We propose an appropriate hardware structure to support the VC-merge function and differentiated services simultaneously. In this paper, we use the adaptive congestion control method such as EPD algorithm in carte that there is a possibility of network congestion in output buffers of each core LSR. In addition, we justify the validity of the proposed VC-merge method through simulation and comparison to conventional Non VC-merge methods. The proposed VC-merge capable switch is modeled in VHDL. synthesized, and fabricated using the SAMSUNG 0.5um SOG process.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.270-273
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• 2001

본 논문에서는 실시간 성능 관리를 위해 패킷 분석 시스템을 설계하고 구현하였다. 기존의 MIB 정보를 이용한 망 관리에서는 관리국의 주기적인 요청으로 각 에이전트의 MIB 정보를 가져와 분석하는 방식으로, 실시간 감시에는 적합하지 않은 단점이 있다. 따라서, 본 논문에서는 실시간 트래픽 감시를 위해 시스템을 설계하고 구현하였다. 제안된 시스템은 트래픽 상태를 감시하는 모니터링 시스템과 관측된 트래픽을 보여주는 인터페이스 부분으로 나눌 수 있다. 모니터링 시스템은 각 노드의 트래픽을 감시하여 각 패킷별로 구분하여 사용자 인터페이스에 넘겨주게 되며, 이를 사용자 인터페이스에서는 수치형 자료로 표시하거나, 범주형 자료인 그래프로 나타내게 된다. 이 시스템은 각 노드의 부하 여부를 감시하여, 비정상적인 트래픽의 폭주를 발견하게 되면 분석 모듈의 작동에 의해 해킹을 비롯한 네트워크 장애를 감지할 수 있다. 이는 실시간 망 관리의 중요한 기본 기술로 여러 분야에 활용할 수 있다.

• Review of KIISC
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• v.8 no.1
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• pp.99-112
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• 1998

ATM 방식을 근간으로 한 광대역 통신망의 급속한 발전에 따라 점차로 그 수요가 증가할 데이터 응용들을 위한 ABR서비스는 우선 순위가 높은 다른 서비스들이 이용하고 남는 가용 대역폭을 최대한 활용해야 한다. 따라서 최근까지도 피드백을 이용한 대응적 제어를 이용한 폭주 제어 방식들에 대한 연구가 진행되어왔고 여러 알고리즘들이 제안되었다. 본 논문에서는 ATM망에서의 ABR(Available Bie-Rate) 트래픽의 특성과 ATM포럼과 ITU-T등에서 표준화되었거나 현재 연구중인 다양한 제어 기법들에 대한 개괄적인 분석이 수행되었다. 그와 아울러 각 알고리즘들의 장, 단점을 살펴보고 개선되어야 할 사항들을 제시하였으며 좀 더 효듈적인 제어를 위해 고려되어야 할 트래픽 특성들을 설명하고 있다.

• The Optical Journal
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• s.124
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• pp.38-42
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• 2009

풍성한 가을만큼 지난 10월에는 국내에서 다양한 산업 전시회가 펼쳐졌다. 국제조명산업전을 시작으로 한국전자산업대전, 대한민국 녹색에너지대전, 서울 국제 항공우주 방위산업전, 한국기계산업대전 등이 차례로 열렸다. 신종인플루엔자의 유행으로 국제광산업전시회가 취소되는 해프닝과 함께 각 전시회장에는 신종인플루엔자 방역관련 부스를 운영하는 신풍경도 연출됐다. 세계적인 독감유행으로 해외바이어들의 발길이 크게 줄어들까 하는 걱정도 낳았으나 나날이 발전하는 신기술과 함께 비즈니스 상담이 폭주하는등 대부분의 전시회가 풍성한 결과를 얻어냈다는 평이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.423-425
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• 2013

정박선의 증가로 인해 VTS에서는 정박지를 선박에게 권고함에 있어서, 보다 효율적인 방법을 요하게 되었다. 정박지라는 한정된 범위 안에서 가능한 한 다수의 선박을 안전하게 투묘시킬 수 있는 방법을 모색하여 보았다. 각 항구의 정박지 권고 방식을 비교해보고, 포항항을 중심으로 격자형 정박지 권고 방식을 교신의 간소화와 함께 효율을 높일 수 있는 하나의 대안으로 제시하였다.

• Journal of the Korea Computer Industry Society
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• v.2 no.4
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• pp.547-564
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• 2001

In this paper a simulation has been performed to compare and evaluate the performance between the EPRCA(Enhanced Proportional Rate Control Algorithm) and EMRCA(Explicit Max_min Rate Control Algorithm) switches. The variation of the ACR at the source end system, the queue length, the utilization rate of the link bandwidth and the share fairness at the transient and steady states are used as the evaluation criteria for the simulation. The EMRCA switch is more stable than the EPRCA switch and reduces its buffer size. Also, it achieves a higher utilization rate of the link bandwidth than the EPRCA switch. The hardware complexity of the EMRCA switch is significantly lower than the EPRCA and other rate-based switches. Since it eliminates the necessity of the floating-point operation for calculation of the MACR(Mean Allowed Cell Rate) at the switch.