• 제어로봇시스템학회논문지
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• 제22권11호
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• pp.883-887
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• 2016

Navigating an unknown environment is a challenging task for a robot, especially when a large number of obstacles exist and the odometry lacks reliability. Pose tracking allows the robot to determine its location relative to its previous location. The ICP (iterative closest point) has been a powerful method for matching two point clouds and determining the transformation matrix between the maps. However, in a situation where odometry is not available and the robot moves far from its original location, the ICP fails to calculate the exact displacement. In this paper, we suggest a method that is able to match two different point clouds taken a long distance apart. Without using any odometry information, it only exploits the features of corner points containing information on the surroundings. The algorithm is fast enough to run in real time.

• 아동학회지
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• 제25권6호
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• pp.89-103
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• 2004

This study examined books of youngsters who struggled with typical problems in adolescent period. Literature could be used as an effective tool for helping young people cope with developmental change. In bibliotherapy, the counselor provides guidance in the solution of personal problems through directed reading. Young people would solve and overcome their problems after reading useful books. So we need to carefully select books for the Youth. Selecting high-quality books that match the young person's reading level and interest were very important. Twenty three books that offer solutions that are likely to be successful in the young people's situation were gathered by 322 participants. Method of collecting materials was through a questionnaire. In addition results based on obtaining books showed that counselors provided reading guidances and were concerned with quality materials.

• 대한임베디드공학회논문지
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• 제19권1호
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• pp.33-38
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• 2024

In this paper, we propose the implementation of a drone delivery system using artificial intelligence in a situation where the use of drones is rapidly increasing and human errors are occurring. This system requires the implementation of an accurate control algorithm, assuming that last-mile delivery is delivered to the apartment veranda. To recognize the delivery location, a recognition system using the YOLO algorithm was implemented, and a delivery system was installed on the drone to measure the distance to the object and increase the delivery distance to ensure stable delivery even at long distances. As a result of the experiment, it was confirmed that the recognition system recognized the marker with a match rate of more than 60% at a distance of less than 10m while the drone hovered stably. In addition, the drone carrying a 500g package was able to withstand the torque applied as the rail lengthened, extending to 1.5m and then stably placing the package down on the veranda at the end of the rail.

• 한국자동차공학회논문집
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• 제16권1호
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• pp.52-63
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• 2008

The side collision reconstruction algorithm is developed using three dimensional car crash analysis. Medium size passenger car is modeled for finite element analysis. Total 24 side collision configurations, four different speed and six different angle, are set up for making side collision database. Deformation index and degree index are built up for each collision case. Deformation index is a kind of deformation estimate averaging displacement of side door of crashed car from finite element analysis result. Angle index is constructed measuring deformed angle of crashing car. There are two kinds of angle index, one is measured at driver's side and the other is measured at passenger's side. Also a collision analysis information in side of cars is used for giving a basis for scientific and practical reason in a reconstruction of the car accident. The analysis program, LS-DYNA3D is utilized for finite element analysis program for a collision analysis. Those database are used for side collision reconstruction. Side collision reconstruction algorithm is developed, and applied to find the collision conditions before the accident occurs. Three example collision cases are tried to check the effectiveness of the algorithm. Deformation index and angle index is extracted for the case from the analysis result. Deformation index is compared to the established database, and estimated collision speed and angle are introduced by interpolation function. Angle index is used to select a specific collision condition from the several available conditions. The collision condition found by reconstruction algorithm shows good match with original condition within 10% error for speed and angle. As a result, the calculation from the reconstruction of the situation is reproducing the situation well. The performance in this study can be used in many ways for practical field using deformation index and degree index. Other different collision situations may be set up for extending the scope of this study in the future.

• 디자인학연구
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• 제9권
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• pp.1101-1114
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• 1994

As of today-half a century has passed after 1945, the liberation from Japanese imperialism-it's significant to introspect our culture. On the one hand our culture has succeeded due to the peculiar history, but on the other hand it hasn't. So to speak, it has gained in Quantity but lost in Quality. There are keen, international competition and exchange in the modern culture. So the Qualitive success of modern design depends on if it had an original character or not. According to Korean rapid industrialization, technological extence, and economic growth, the export has increased greatly, but package design hasn't been match for them. Korean expoters have been meeting with cutthroat competition in world market. Under these circumstances it's very important that we have a real understand and interest in our culture, we strengthen the competitive power of home products with good package design. This is our age of not home market but world market. We live in an age when design wins, so that we have to develop the good design native to Korea. Many designers have proposed their opinions with the characteristic designs, but it has been only a fragmentary and passive method. We must seek for the new method more positively. The effective and proper method resolves itself into the following four points. First, to understand Korean history and culture. Second, to have the exact grip of this economic situation. Third, to promote the national emotion. Fourth, in conclusion, to accord the package design with them. We cannot put off this task to overcome the cultural subordination, to place Korea on a firm cultural basis in the world, and to contribute to the cultural exchange of package design. First, to understand Korean history and culture. Second, to have the exact grip of this economic situation. Third, to promote the national emotion. Fourth, in conclusion, to accord the package design with them. We cannot put off this task to overcome the cultural subordination, to place Korea on a firm cultural basis in the world, and to contribute to the cultural exchange of package design.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권8호
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• pp.3862-3888
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• 2017

In high diversity node situation, single-channel MAC protocols suffer from many collisions. To solve this problem, the research of multichannel MAC protocol has become a hotspot. And the cyclic quorum-based multichannel (CQM) MAC protocol outperformed others owing to its high frequency utilization. In addition, it can avoid the bottleneck that others suffered from and can be easily realized with only one transceiver. To obtain the accurate performance of CQM MAC protocol, a Markov chain model, which combines the channel hopping strategy of CQM protocol and IEEE 802.11 distributed coordination function (DCF), is proposed. The metrics (throughput and average packet transmission delay) are calculated in performance analysis, with respect to node number, packet rate, channel slot length and channel number. The results of numerical analysis show that the optimal performance of CQM protocol can be obtained in saturation bound situation. And then we obtain the saturation bound of CQM system by bird swarm algorithm (BSA). Finally, the Markov chain model and saturation bound are verified by Qualnet platform. And the simulation results show that the analytic and simulation results match very well.

• 문화기술의 융합
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• 제8권3호
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• pp.351-358
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• 2022

건설업의 사망만인률은 더이상 줄어들지 않고 답보상태에 있으며 이를 개선하기 위한 발주, 설계, 시공, 건설사업관리 등 다양한 건설참여자 주체의 노력이 있다. 정부에서는 타 산업 대비 높은 건설업의 중대재해를 줄이기 위해 건설참여자들의 안전수준을 평가하고 이를 공표하여 경각심을 갖도록 하고 있다. 그러나 안전관리 수준평가의 항목, 기준, 절차에 있어서 현장 상황에 맞지 않는 점들이 나타나고 있어 이들의 개선이 필요하다. 본 연구에서는 안전관리에 가장 열악한 상황에 있는 건설기술용역사업자에 대한 안전관리 수준평가의 개선을 위해 기존 안전관리 수준평가 결과분석, 평가자 및 피평가자 심층인터뷰(FGI)를 시행하였으며 이를 근거로 평가의 개선방향을 도출하였다.

• 대한토목학회논문집
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• 제28권4D호
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• pp.539-543
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• 2008

현재 고속철도역의 안내표지판은 여러 가지 관점에서 많은 문제점이 있다. 일례로, 모든 고속철도역에서 모양이나 배치에 대한 통일성이 없다. 그리고 시설물의 안내 표시가 실제 위치와 전혀 다른 방향을 가리키는 표지판도 있다. 또한, 광고나 다른 장애물에 가려 보이지 않는 문제점이 있다. 이에 본 논문에서는 안내표지판의 시인성, 정확성, 통일성, 간결성의 특성을 포함하는 표준화 방안을 제시하였다. 제공하는 안내정보의 의미와 방법에 따라서 방향안내, 위치안내, 정보안내로 분류하였다. 분류한 유형에 따라 전국의 고속철도역을 조사하여 안내표지판의 특성을 분석하였다. 그리고 조사결과를 바탕으로 시인성, 정확성, 통일성, 간결성을 고려하여 우리나라에 적합한 안내표지판의 표준화 방안을 제시하였다.

• 혜화의학회지
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• 제23권1호
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• pp.21-55
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• 2014

Objectives : This report describes the original references of 154 formulas related to the use of Rhei Rhizoma main blended from Dongeuibogam. Methods : This study analyzes the original references of 154 formulas including Rhei Rhizoma as a key component in Dongeuibogam. Results : There were five types as follows: 1.There is no exact match between 154 formulas in Dongeuibogam and the original formulas in references. 2. Case that could not found the original formula in reference: 22%. 3. Case that the citation is the similar to the original reference: 4%. 4. Case that the citation is not same to expression but contents basically: 73%. 5. Case of addition of content: 1% Conclusions : Most formulas related to the use of Rhei Rhizoma main blended from Dongeuibogam are similar to the contents in the original references. But we can find that Heo Jun, who writes Dongeuibogam, modifies the contents for his intention of editing, idea and situation in Korea.

• 산업경영시스템학회지
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• 제36권4호
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• pp.109-115
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• 2013

Process Capability Index (PCI) is useful Statistical Process Control (SPC) tool that is measure of process diagnostic and assessment tools widely use in industrial field. It has advantage of easy to calculate and easy to use in the field. $C_p$ and $C_{pk}$ are traditional PCIs. These are only considers of process variation. These are not given information about the characteristic value does not match the target value of the process. Studies of this process capability index by many scholars actively for supplement of its disadvantage. These studies to evaluate the capability of situation of various field has presented a new process capability index. $C_{pm}$ is considers both the process variation and the process deviation from target value. And $C_{pm}{^+}$ is considers economic loss for the process deviation from target value. In this paper development of new process capability index that is Taguchi's quadratic loss function by applying the expected loss. And check the correlation between existing traditional process capability index ($C_{pk}$) and new one. Finally, we propose the criteria for classification about developed process capability index.