• Journal of Positioning, Navigation, and Timing
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• 제4권1호
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• pp.25-31
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• 2015

In this paper, we described the timing-offset comparison results between various daily jump compensation methods for GPS carrier phase (CP) measurement data. For the performance comparison, we used about 70 days GPS measurement data obtained from two GPS geodetic receivers which share the reference 1 PPS and RF signals and closely located in each other within a few meters. From the experiment results, the followings were observed. First, daily jumps existed in CP measurements depend on not only the environment but also the receiver which will make a full compensation be very hard or impossible. Second, clock bias can be occurred in the case of using a simple compensation with accumulation of daily jumps but it could be used in a short-period frequency comparison campaign (less than about 7 days) despite of its drawback.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권9호
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• pp.4624-4640
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• 2017

This paper mainly presents a secure and efficient e-Medical Record System via searchable encryption scheme from asymmetric pairings, which could provide privacy data search and encrypt function for patients and doctors in public platform. The core technique of this system is an extension public key encryption system with keyword search, which the server could test whether or not the files stored in platform contain the keyword without leaking the information about the encrypted file. Compared with former e-medical record systems, the system proposed here has several superior features: (1)Users could search the data stored in cloud server contains some keywords without leaking anything about the origin data. (2) We apply asymmetric pairings to achieve shorter key size scheme in the standard model, and adopt the dual system encryption technique to reduce the scheme's secure problem to the hard Symmetric External Diffie-Hellman assumption, which could against the variety of attacks in the future complex network environment. (3) In the last of paper, we analyze the scheme's efficiency and point out that our scheme is more efficient and secure than some other classical searchable encryption models.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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• pp.391-394
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• 2009

Asymmetrical and unbalanced features such as rotor blade of helicopter, actuator of hard-disk in personal computer are usually manufactured with composite materials. In this case, mass distributions and center of gravity of the parts are important because of their static balancing. Therefore in the manufacturing processes, it is needed to check out the exact data of weight and gravity center. In this study, it has been studied experimentally the balancing of laminated rotor blade by using multiple-point weighing method and lab-view system.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제1권2호
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• pp.73-81
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• 1996

The construction of the health care facilities in terms of medical institutional source cost much and affect on management of another sources like, staffs for the health care delivery systems and the medical service For it is hard to amend and change the physical component of the facilities, the reasonability and the efficiency of the facilities should be the major considering point. Consequently, the purpose of this study is to represent the basic data for determining the size of general hospital by analyzing the use pattern of existing facilities and investigating annual use pattern and user's distance from the facilities.

• 한국조경학회지
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• 제24권1호
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• pp.42-54
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• 1996

Many of urban parks which have been designated for urban planning regulation are not well developed because the priority of investment is inferior to that of other public facilities. Park development is an urgent urban policy and it is hard to decide priority among parks. Therefore, it is necessary to evaluate the priority of park development. Thus the Analytic Hierarchy Process has been introduced because it is suitable for achieving objectivity by collecting the professional opinions. The goals of park development are evaluated by AHP method and the priorities among goals are conservation of natural environment, satisfying the residents' residents' needs, population density, regional pollution, land acquisition cost, ratio of greeneries and facilities within park areas. Priority of park development is decided by the standardization of each individual inventory data and considering of the professional opinions. Among the multi-attribute judgement methods, AHP method may be the most widely used. Despite the critical evaluations of the AHP, such as limitation of the nine-point scale and the rank reversal problem, application of AHP to decide the priority of park development is suitable for actual circumstances.

• ETRI Journal
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• 제19권3호
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• pp.98-115
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• 1997

The architecture of the CDMA mobile system (CMS) is developed based on three function groups - service resource, service control, and service management groups. In this paper, the CMS architecture is discussed from the point of view of implementing these functions. The variable length packets are used for transmission. The synchronization clock signals are derived form the GPS receiver. The open loop and closed loop techniques are used for the power control. The internationally accepted signaling and network protocols are employed. The call control for the primary services in designed to provide efficient mobile telecommunication services. The softer handoff is implemented in one card. The mobile assisted handoff and the network assisted handoff are employed in the soft and hard handoffs. The authentication is based on the secret data which includes random numbers. The management functions, which include the location management, resource management, cell boundary management and OAM management, are implemented to warrant the system efficiency, maximum capacity and high reliability. The architecture ensures that the CMS is flexible and expandable to provide subscribers with economic and efficient system configuration. The dynamic power control, adaptive channel allocation. and dynamic cell boundary management are recommended for future work.

• International Journal of Aerospace System Engineering
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• 제2권2호
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• pp.15-18
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• 2015

In general, most of the function and using of building is for single purpose. However, current buildings combine several functions that causes a lot of problems not on firefighting only but also on environment engineering. Because of hard integration on different fields that causes a lot of conflict. That wastes cost and time. That also threaten the safety of firefighting. This search focuses on the drawing verification and field inspection on firefighting. These two items both remain paper work. To complete the current work, it needs to bring a great amount of drawing papers in the field. By BIM, integrated data can be extracted. It makes the drawing verification and field inspection easier and increases the efficiency. That is the main point of this research.

• 대한기계학회논문집
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• 제12권6호
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• pp.1290-1295
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• 1988

본 연구에서는 공구마멸에 대한 정량적인 해석을 바탕으로 현대 산업사회의 주요소재인 강(steel)에 대한 최적 공구재를 선정하는 방법을 제시하므로서 앞으로의 공구재 개발에 대한 이론적인 접근을 시도하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제3권4호
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• pp.17-26
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• 1997

The construction of the health care facilities in terms of medical institutional source cost much and affect on management of another sources like staffs for the health care delivery systems and the medical service. For it is hard to change the physical component of the facilities, the reasonability and the efficiency of the facilities should be the major considering point. Consequently, the purpose of this study is to represent the basic data for determining the size and type of corridor space in ward by investigating the design pattern of existing facilities and analyzing several model according to corridor type.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제5권8호
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• pp.369-376
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• 2016

점 클라우드로부터 차량을 추출하는 다양한 방식 중 OBPCA 방식은 세그먼트 단위의 평가-분류로 정확도가 높고, 단순한 직사각형 평면도에서 특성 값들을 추출하므로 분류가 빠르다. 그러나 이 OBPCA 방식은 차량과 크기가 비슷한 직육면체 모양의 물체를 차량과 구별하지 못하는 문제를 가지므로 이를 극복하고 차량 추출의 정확도를 높이는 방안에 대한 연구가 필요하다. 본 논문에서는 이 문제를 해결하기 위해 수평 단면과 함께 수직 단면을 이용하는 확장 OBPCA 방식을 제안한다. 제안 방법은 수평 단면을 통해 차량 후보를 1차로 선별하고, 각 차량 후보에서 가장 특징적인 수직 단면을 찾아서 그 단면의 특성 값들을 임계값들과 비교하여 차량 여부를 판단한다. 비교실험에서는 본 제안방식이 기존 OBPCA 방식에 비해 정밀도가 6.61% 향상되고 위양성률이 13.96% 감소됨을 확인했으며, 이를 통해 제안 방식이 기존 OBPCA 분류오류 문제에 대해 효과적인 해결방안임을 보였다.