• 한국멀티미디어학회논문지
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• 제25권1호
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• pp.52-60
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• 2022

Few-shot learning is a sub-area of machine learning problems, which aims to classify target images that only contain a few labeled samples for training. As a representative few-shot learning method, the Prototypical network has been received much attention due to its simplicity and promising results. However, the Prototypical network uses the sample mean of samples from the same class as the prototypes of that class, which easily results in learning uncharacteristic features in the low-data scenery. In this study, we propose to use local descriptors (i.e., patches along the channel within feature maps) from the same class to explicitly obtain more representative prototypes for Prototypical Network so that significant intra-class feature information can be maintained and thus improving the classification performance on few-shot learning tasks. Experimental results on various benchmark datasets including mini-ImageNet, CUB-200-2011, and tiered-ImageNet show that the proposed method can learn more discriminative intra-class features by the local descriptors and obtain more generic prototype representations under the few-shot setting.

• 환경생물
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• 제37권4호
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• pp.467-473
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• 2019

야생동물의 신체부위의 절단은 야생에서 활동에 영향을 미칠 수 있으며, 특히 겨울철 동면기간에 새끼를 출산하는 반달가슴곰의 경우 겨울철 생존과 양육활동에 영향을 미칠 수 있다. 지난 2017년 지리산국립공원에 서식하는 반달가슴곰이 올무에 걸려 오른쪽 앞발 절단 수술을 하여 같은 해에 야생에 방사되어 2개체의 새끼를 출산하였다. 이 개체와 함께 같은 해에 출산한 암컷 5마리의 출산 및 양육기간 동안 계절별로 행동권을 분석한 결과, 활동 시기에는 다른 개체들에 비해 넓은 행동권과 많은 이동거리를 나타냈다. 이는 신체장애로 인한 먹이 활동과 새끼 양육에 따른 영향으로 추정된다. 다른 개체들에 비해 불리한 환경에서 자라난 반달가슴곰 새끼가 현재는 문제를 일으키지 않지만 지속적인 모니터링을 통해서 어미의 양육 학습의 성공여부를 파악할 수 있을 것이다. 이 연구결과는 여러 관점에서의 사람과의 갈등에 대한 장기적인 관리 방향을 설정하고 계획을 수립하는 데 활용될 수 있을 것이라 판단된다.

• 항공우주시스템공학회지
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• 제8권3호
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• pp.27-33
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• 2014

The CubeSat, which was first launched to verify new technologies and for educational purposes, is now widely used as an educational tool since it makes possible development of manpower through practical training to produce the satellite at low development costs. At present, research and development on the CubSat is rapidly expanding in domestic and foreign universities. As one of the final 3 teams selected in the 2013 CUBE SATELLITE CONTEST organized by the Ministry of Science, ICT and Future Planning, Chosun University is also currently conducting R & D of STEP Cube Lab, which is a CubeSat scheduled to be launched in 2015 and whose main task is to verify space-based technologies in orbit. The present paper tries to present an overview of the CubeSat of Chosun University whose development is being led by its undergraduate students, and further, introduce the strengths of the present development program for developing space experts, based on the educational achievements from the R & D.

• The Journal of Asian Finance, Economics and Business
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• 제5권1호
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• pp.17-27
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• 2018

In 21^st Century business world, services are carried out in multifaceted, competitive and rationality manner that are characterized by evolving many factors, which are often unpredictable. On-the-go banking is a product in financial sector. However, it faces serious pitfalls being it riskiness. Bank customers compete for time-saving options. On contrary, PCBs compete for marginalizing its operating costs for enhancing its revenues. On strategic tactics, PCBs targets city customers in multi-facets including offering incentives for enhanced usages of on-the-go banking. Influencing customer's intention, attitude and behavior in banking, PCBs also offers incentive under market system along with often informational asymmetry. However, it causes exploitation. In most cases customers don't read terms & conditions of services. They don't save contract-copy. These weaknesses cause abuses. Customer faces hidden charges, extra fees, account hacked. Addressing the issue, Voluntary Insurance Option is proposed where PCBs will introduce it as a product of bank-services. Transferring risk away from customer will benefit both PCBs and bank-customers. This product can attract new customers who were on the brink using digital banking but just felt it was too risky. This model can facilitate the parties involved for increasing usage of on-the-go banking-services while customers can maintain optimal utility of usages.

• 한국전자파학회논문지
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• 제26권12호
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• pp.1100-1107
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• 2015

미상의 레이더에서 방사하는 전자파를 수신하여 신호를 처리한 후, 레이더의 변조방식을 식별하는 일은 전자전에서 매우 핵심 과제이다. 본 논문에서는 최근 전자전 보호능력이 우수한 Wobble PRI 방식과 Sinusoidal PRI 변조방식을 자동식별하는 알고리즘을 DTOA(Difference Time Of Arrival)을 적용하여 개발하였다. 안테나로 입력되는 레이더 펄스의 PRI를 산출하고, 산출된 PRI의 각 값으로부터 시간차의 특성을 산출하여 알고리즘을 개발하였다. 알고리즘을 프로그래밍한 후 각각 40개의 표본 PRI데이터를 입력하여 처리한 결과, 모두 정확히 PRI 변조방식을 식별하였다. 개발된 알고리즘은 향후 ESM장비 또는 ELINT 장비에 적용 가능할 것으로 판단한다.

• 한국융합학회논문지
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• 제8권8호
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• pp.333-343
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• 2017

이 연구는 한 탈북아동의 초등학교에서의 삶에 대한 내러티브이다. 탈북 이후 남한의 한 초등학교에 편입한 아이가 배드민턴 스포츠클럽 활동을 통해 적응해 가는 모습을 서술적으로 풀어내고자 하였다. 2017년 초 겨울동안 수집된 자료는 Spradley의 분석 방법을 이용하여 연구텍스트를 분석하고 내러티브로 구성하였다. 연구결과를 보면 동식이의 처음 남한에서의 생활은 불행했다. 그러나 우연한 기회에 배드민턴 활동을 하면서 생활은 많은 변화가 생겼고 자신의 미래에 대한 꿈을 갖게 되었다. 최교사는 동식이와의 첫 만남을 기억했다. 말을 하지 않는 아이였다. 이후 오랫동안 동식이의 입은 열리지 않았다. 그런 동식이가 배드민턴에 몰두하게 되면서 자신의 꿈을 말하는 아이로 변했다. 동식이와 같은 탈북아동에 대한 교육은 근본적인 측면에서 방향이 중요하다. 탈북아동만을 위한 지원책이 아닌 탈북아동과 일반아동이 서로 다르게 보지 않고 함께 생활할 수 있는 통합적인 측면에서의 교육 정책이 우선해야 한다. 더불어 탈북아동에 대한 기대와 믿음을 버리지 않는 것이다. 이 연구는 향후 탈북아동을 넘어 폭넓은 탈북민의 삶을 연구하는 의미 있는 자료가 될 것이다

• 복식
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• 제58권4호
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• pp.155-170
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• 2008

Club culture is the global trend for youth in 21st century. Club is the space that is created with close relationship among music, dance and fashion. It is also experimental cultural art space with endlessly transforming style. Furthermore it is a space for independent minor culture which represents speciality than generality of cultural appetite and style of club. Cultural communities formed around club and their parties have placed as a strong subculture trend based on youth age group. What they are creating as a subculture could be our tomorrow's main trend and clubbers also could be our major power sources for future. Therefore it is necessary to pay attention to club culture. The purposes of this research are to identify the concept of clubber, to analyzes their basic club culture characteristics and elements, and to find out unique fashion styles of Korean clubber in comparison with the origin. To study club fashion style's origin and background, this study searched a theoretical flow from 1930's to 1990's. Then, Korean clubber's style is derived by comparing background and origin of Korean club culture with those of abroad. To analyze in various point of view, theoretical backgrounds about social, cultural, dresses, and design were considered. Since research target is a visual image, street fashion is analyzed on through, music channels and magazines from 1930's to present as well as designer's art photographies. Internet sites', cub culture association's and sound association's photos were also extracted. as a visual evidences to offer actual evidences. Geological targets are selected among Korean club culture's origin such as Hong-Ik University area, Shin-chon, Chungdam-dong and Apgujung-dong areas. The results of this study are as follows. Firstly, clubber's fashion style influenced magnificently on major fashion design instead of being just youngster's resistance toward control group and it is contributing to our fashion culture to enrich it. Secondly, fashion styles of korean clubbers are based on those of western sub-culture, but with a unique localized history.

• Clinical and Experimental Reproductive Medicine
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• 제45권2호
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• pp.94-99
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• 2018

Objective: Prompt diagnosis and management are essential for saving the adnexal organs from infarction in cases of ovarian torsion (OT). This study aimed to determine the diagnostic significance of signal peptide, complement C1r/C1s, Uegf, and Bmp1 (CUB), and epidermal growth factor-like domain-containing protein-1 (SCUBE-1) levels in cases of OT, an emergent ischemic condition, and the relationship of SCUBE-1 with oxidative stress parameters. Methods: This prospective study was conducted among 15 OT patients and 20 age- and gravidity-matched healthy women. SCUBE-1 serum concentrations were determined by using enzyme-linked immunosorbent assays. In addition, oxidative stress was evaluated by measuring the serum levels of advanced oxidation protein products (AOPP), ferric reducing ability of plasma (FRAP), and glutathione (GSH). Results: The SCUBE-1 titers were significantly higher in the patients with OT than in the controls (p=0.008). In addition, serum FRAP and GSH levels were significantly lower in the OT patients than in the controls (p<0.001 for both). Serum AOPP levels were higher in the OT patients, but this trend was not statistically significant (p>0.05). Furthermore, there were no correlations between SCUBE-1 levels and age, gravidity, parity, cyst size, and AOPP, FRAP, or GSH levels (p>0.05). Conclusion: We believe that SCUBE-1 may be a promising biomarker for the early diagnosis of OT.

• 한국수소및신에너지학회논문집
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• 제23권4호
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• pp.300-309
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• 2012

Long endurance is a key issue in the application of unmanned aerial vehicles. This study presents feasibility test results when fuel cell system as an alternative to the conventional engine is applied for the power of the UAV after the 150W fuel cell system is developed and packaged to the 1/4 scale super cub airplane. Fuel cell system is operated by dead-end method in the anode part and periodically purged to remove the water droplet in flow field during the operation. Oxygen in the air is supplied to the stack by the two air blowers. And fuel cell stack is water cooled by cooling circuit to dissipate the heat generated during the fuel cell operation. Weight balance is considered to integrate the stack and balance of plant (BOP) in package layout. In flight performance test, we demonstrated 4 times standalone take-off and landing. In the laboratory test simulating the flight condition to quantify the energy flow, the system is analyzed in detail. Sankey diagram shows that electric efficiency of the fuel cell system is 39.2%, heat loss 50.1%, parasitic loss 8.96%, and unreacted purged gas 1.67%, respectively compared to the total hydrogen input energy. Feasibility test results show that fuel cell system is high efficient and appropriate for the power of UAV.

• Korean Journal of Radiology
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• 제24권6호
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• pp.574-589
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• 2023

Radiopharmaceuticals targeting prostate-specific membrane antigens (PSMA) are essential for the diagnosis, evaluation, and treatment of prostate cancer (PCa), particularly metastatic castration-resistant PCa, for which conventional treatment is ineffective. These molecular probes include [⁶⁸Ga]PSMA, [¹⁸F]PSMA, [Al¹⁸F]PSMA, [^99mTc]PSMA, and [⁸⁹Zr]PSMA, which are widely used for diagnosis, and [¹⁷⁷Lu]PSMA and [²²⁵Ac]PSMA, which are used for treatment. There are also new types of radiopharmaceuticals. Due to the differentiation and heterogeneity of tumor cells, a subtype of PCa with an extremely poor prognosis, referred to as neuroendocrine prostate cancer (NEPC), has emerged, and its diagnosis and treatment present great challenges. To improve the detection rate of NEPC and prolong patient survival, many researchers have investigated the use of relevant radiopharmaceuticals as targeted molecular probes for the detection and treatment of NEPC lesions, including DOTA-TOC and DOTA-TATE for somatostatin receptors, 4A06 for CUB domain-containing protein 1, and FDG. This review focused on the specific molecular targets and various radionuclides that have been developed for PCa in recent years, including those mentioned above and several others, and aimed to provide valuable up-to-date information and research ideas for future studies.