• Journal of Agricultural Extension & Community Development
• /
• v.1 no.2
• /
• pp.95-103
• /
• 1994

Recently Korean government has proceeded to reorganize agricultural extension system as a part of reduction plan of national governmental body. Function and characteristics of agricultural extension system under the localization was presented in the view of long term agricultural development policy.

• Journal of Sensor Science and Technology
• /
• v.26 no.3
• /
• pp.199-203
• /
• 2017

In this paper, we developed an underwater localization system for underwater robot docking using the electromagnetic wave attenuation model. Electromagnetic waves are generally known to be impossible to use in water environment. However, according to the conclusions of the previous studies on the attenuation characteristics in underwater, the attenuation pattern is uniform and its model was accurately proposed and verified in 3-dimensional space via the omnidirectional antenna. In this paper, a docking structure and localization sensor system are developed for a widely used cone type docking mechanism. First, we fabricated electromagnetic wave range sensor transmit modules. And a mobile sensor node is equipped with unmanned underwater vehicle(UUV)s. The mobile node senses the four different signal strength (RSS: Received Signal Strength) from fixed nodes, and the obtained RSS data are transformed to each distance information using the 3-Dimensional EM wave attenuation model. Then, the relative localization between the docking area and underwater robot can be achieved according to optimization algorithm. Finally, experimental results show the feasibility of the proposed localization system for the docking induction by comparing the errors in the actual position of the mobile node and the theoretical position through the model.

• Journal of Chest Surgery
• /
• v.54 no.6
• /
• pp.494-499
• /
• 2021

Background: A recent increase in the incidental detection of ground glass nodules (GGNs) has created a need for improved diagnostic accuracy in screening for malignancies. However, surgical diagnosis remains challenging, especially via video-assisted thoracoscopic surgery (VATS). Herein, we present the efficacy of a novel electrical navigation system for perioperative percutaneous transthoracic nodule localization. Methods: Eighteen patients with GGNs who underwent electromagnetic navigated percutaneous transthoracic needle localization (ETTNL), followed by 1-stage diagnostic wedge resections via VATS between January and December 2020, were included in the analysis. Data on patient characteristics, nodules, procedures, and pathological diagnoses were collected and retrospectively reviewed. Results: Of the 18 nodules, 17 were successfully localized. Nine nodules were pure GGNs, and the remaining 9 were part-solid GGNs. The median nodule size was 9.0 mm (range, 4.0-20.0 mm); and the median depth from the visceral pleura was 5.2 mm (range, 0.0-14.4 mm). The median procedure time was 10 minutes (range, 7-20 minutes). The final pathologic results showed benign lesions in 3 cases and malignant lesions in 15 cases. Conclusion: Perioperative ETTNL appears to be an effective method for the localization of GGNs, providing guidance for a 1-stage VATS procedure.

• Journal of the Korean Society of Food Culture
• /
• v.24 no.3
• /
• pp.286-294
• /
• 2009

The purpose of this study was to determine whether foodservice brand language localization affects consumer attitudes in terms of similar brand image recognition with an original brand. Many global foodservice companies have tried to modify their own brand identity according to local situations in order to attract more consumers. According to this study's results, consumers who similarly recognized both the original brand image and localization brand image tended to have greater purchase intention than those who did not recognize them similarly. In addition, when the original brand identity was changed to the local language, consumers more similarly conceived the original brand image and localization. And for local store marketing, foodservice companies should have a thorough marketing research plan since there can be difference results according to brand name recognition gaps or demographic characteristics. Original brand image similarity recognition by consumers affected their attitudes. In other words, the group that similarly recognized both the original brand company image and the localization brand company image tended to have greater purchase intention. Because brand language plays an important role in consumer attitudes with respect to recognizing a brand and distinguishing another brand, this study suggests that franchise foodservice companies have a local store marketing plan.

• Proceedings of the IEEK Conference
• /
• 2007.07a
• /
• pp.415-416
• /
• 2007

HRTF DB, including the information of the sounds which is arrived to our ears, is generally used to make a 3D sound. But it can decline some three-dimensional effects by the confusion between front and back directions due to the non-individual HRTF depending on each listener. In this paper, we propose a new method to use psychoacoustic theory that reduces the confusion of sound image localization. And we make use of an excitation energy by the sense of hearing. This method is brought HRTF spectrum characteristics into relief to draw out the energy ratio about the bark band and control low frequency band. Informal listening tests show that the proposed method improves the front-back sound localization characteristics much better than the conventional methods.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.8C
• /
• pp.1142-1148
• /
• 2004

A binaural filtering method using HRTF DB is generally used to make the headphone-based 3D sound. But it can make some confusion between front and back directions or between up and down directions due to the non-individual HRTF depending on each listener. To reduce the confusion of sound image localization, we propose a new method to boost the spectral cue by modifying HRTF spectra with spectrum difference between front and back directions. Informal listening tests show that the proposed method improves the front-back sound localization characteristics much better than the conventional methods

• Journal of Institute of Control, Robotics and Systems
• /
• v.13 no.9
• /
• pp.903-909
• /
• 2007

Mobile Robots are increasingly being used to perform tasks in unknown environment. The potential of robots to undertake such tasks lies in their ability to intelligently and efficiently search in an environment. To achieve autonomous mobile robot navigation, efficient path planner and accurate localization technique are the fundamental issues that should be addressed. This paper presents mobile robot localization using IRID(InfraRed IDentification) as artificial landmarks. IRID has highly deterministic characteristics, different from RFID. By putting several IRID emitters on the ceiling, the floor is divided into many different sectors and each sector is set to have a unique identification. Dead-reckoning provides the estimated robot configuration but the error becomes accumulated as the robot travels. IRID information tells the sector the robot is in, but the size of the uncertainty is too large if only the IRID information is used. This paper presents an algorithm which combines both the encoder and the IRID information so that the size of the uncertainty becomes smaller. It also introduces a framework which can be used with other types of the artificial landmarks. The characteristics of the developed IRID and the proposed algorithm are verified from the simulation results and experiments.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2018.05a
• /
• pp.30-31
• /
• 2018

The localization performance in the ship environment is degraded by RF interference due to steel structure characteristics and NLOS environment. In this paper, a wireless hybrid localization system using ZigBee, UWB, and LF technologies is proposed to improve position estimation accuracy in the ship environment.

• Journal of the Institute of Convergence Signal Processing
• /
• v.12 no.1
• /
• pp.1-6
• /
• 2011

In this study, we investigated the effect of the simplification for high frequency region in Head-Related Transfer Function(HRTF) on the sound localization. For this purpose, HRTF was measured and analyzed. The result in the HRTF frequency characteristic of the back sound source showed that the decrease revel of high frequency was smaller than that of low frequency region, which means the possibility of simplification in the high frequency region. Simplification was performed by flattening of the high frequency amplitude characteristics with the insertion of the low-pass filter, whose cutoff frequency is given by boundary frequency. Auditory experiments were performed to evaluate the simplified HRTF. The result showed that direction perception was not influenced by the simplification of the frequency characteristics of HRTF for the error of sound localization. The rate of confusion for the front and back was not affected by the simplification of the frequency characteristics over 8kHz of HRTF. Finally, we made it clear that the sound localization was not affected by the simplification of frequency characteristics of HRTF over 8kHz.

• Journal of Agricultural Extension & Community Development
• /
• v.1 no.2
• /
• pp.105-121
• /
• 1994

This study examines the characteristics of agricultural extension in developed countries to provide the direction for the development of Korean agricultural extension system. The study, then, examines the validity for the localization of agricultural extension system. The study undertakes mil surveys of 314 persons in extension offices, administration offices, National Agricultural Cooperative Federation, agricultural school and colleges. The study justifies the localization of extension system in the long run but not in the short run. It finds the localization within next two years as suggested by central government is not appropriate and suggests the localization after the local government has settled down.