• Journal of the Institute of Electronics Engineers of Korea TC
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• v.49 no.3
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• pp.8-13
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• 2012

In this paper, we investigate cooperative spectrum sensing scheme for sensor network-aided cognitive radio systems with energy harvesting capability. In the proposed model, each sensor node harvests ambient energy from environment such as solar, wind, mechanical vibration, or thermoelectric effect. We propose adaptive cooperative spectrum sensing scheme in which each sensor node adaptively carries out energy detection depending on the residual energy in its energy storage and then conveys the sensing result to the fusion center. From simulation results, we show that the proposed scheme minimizes the false alarm probability for given target detection probability by adjusting the number of samples for energy detector.

• Journal of the Korean Dietetic Association
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• v.1 no.1
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• pp.31-42
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• 1995

The aims of this study are to enhance the students' knowledge of the drinking water and its reliability by investigating drinking water situation and the degree of students' knowledge on the drinking water. The results are as follows 1. Status and drinking behavior about school drinking water (1) 97.53% of the schools are using the tap water as the resource of drinking water (2) 46 schools are in possession of water tank and 18 schools of them are using the water tank as the resource of drinking water. The cleaning and sanitization of the tank are carried out once in a year with hypochloronatrium by the low-level officials, nurse teachers, and dietitian. 2. The degree of students' knowledge about drinking water (i) This survey represent that students favor the spring water best and think the tap water worst for drinking. (2) 83% of the students think that the tap water is polluted and these conception are formed mostly by the mass communication. 80% of boys and 90% of girls answered they don't drink plain tap water.

• Journal of the Society of Naval Architects of Korea
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• v.45 no.1
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• pp.101-107
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• 2008

According to the existing research result on the seabed organic sediment, pollutants from the land and the sea contaminate the coastal water and sediment on the seabed. To tackle this problem, we need to dredge organic sediment. In the present paper, the development of removing system of seabed sediment by the difference of water head is researched by experimental method. For the validation of the decompression system, computations for validation are carried out for sediment removing equipment. The performance of inhalation equipment is analysed by some model tests.

• Annual Conference on Human and Language Technology
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• 2001.10d
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• pp.341-347
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• 2001

세종전자사전이 궁극적으로 범용전자사전을 지향한다는 점에 비추어 볼 때, 텍스트 자동 분석과 생성, 정보 검색 및 자동 번역 등에 활용될 데이터베이스로서의 전자사전은 자연 언어 어휘의 내적 구조와 기능방식에 관한 정보들, 가령 음운 통사 의미 화용적 가치와 실현 조건 등에 관한 정보들을 체계적이고도 정교하게 담고 있어야만 한다. 의존명사, 대명사, 수사 범주에 속하는 언어 단위들은 단일 명사와 구별되는 어휘 통사적 속성들을 지니며, 사전의 기술 구조에는 그 정보 값들을 체계적으로 명시화할 수 있는 정보 항목과 표상 구조가 설정되어야 한다. 가령 의존명사처럼 통사 의미적 자율성을 지니지 않는 언어 요소의 경우, 어휘 관계 정보보다는 인접하는 여타 언어 단위들과의 호응관계나 결합제약 조건들이 더 중요한 정보일 수 있다. 본 사전이 체언사전의 하위사전으로 별도로 구축되는 것은 단일어 사전에서 그러한 정보들을 효과적으로 표상하기 어렵기 때문이다. 그러나 본 사전은 실제적으로는 체언사전에 통합되어 운영된다는 점에서 이중적 지위를 누린다고 하겠다.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.11a
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• pp.97-102
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• 1996

A methodology for estimating the number of failed fuel rods bused on the primary coolant activity in operating PWRs has been developed. This method deals with both the diffusion and the kinetic models. In case of small or medium cladding failures, the diffusion model which can consider different sizes of failure is used, whereas for large cladding failures the kinetic model is used. From the kinetic model, the release-to-birth rate ratio (R/B) is represented as a linear function of the number of failed fuel rods. This has been done by expressing the escape rate coefficient in terms of the slope of log(R/B) versus $log\;{\lambda}$. The present method has been applied to the cases of 26 cycles of several nuclear power plants for which ultrasonic testings were performed. The results show that the present method gives better predictions than the existing computer codes such as IODYNE and CADE.

• Archives of Reconstructive Microsurgery
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• v.12 no.1
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• pp.30-37
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• 2003

We used bipedicled scapular osteocutaneous free flap for total maxillectomy defect reconstruction in 3 cases of malignant maxillary tumor. We elevated two flaps of the skin paddle and the bone flap with one common pedicle - the subscapular artery - which was devided to the angular branch of the thoracodorsal artery and the circumflex scapular artery to reconstruct the nasal cavity, the palate and the zygoma. The angle between the two flaps was free enough so that we could transfer the two flaps through a single microanastomosis. After the operation, patients could swallow and pronounce well, and the wound contracture was minimal so that we could get aesthetically good result.

• Journal of Korean Society for Atmospheric Environment
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• v.22 no.2
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• pp.191-199
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• 2006

Animal feedstuff handling is one of the major fugitive dust sources in the port of Incheon. For the effective control of fugitive dusts emitting from the port of Incheon, dust control facilities with bag filter systems should be designed properly considering the characteristic of the fugitive dusts including those from animal feedstuffs. The ultimate goal of this study is thus to develop the optimum fugitive dust control system which will be applicable for the renovation of the port. As the first step to achieve this longstanding goal, filtration characteristics of soybean shell, the largest dust sources in the port, were investigated with the specially designed filter testing apparatus for this study. The variables tested for the experiments included filter materials, dust concentrations, relative humidities, and filtration velocities. Also, the filtration characteristics of the other animal feedstuffs such as sunflower seed shell, tapioca, and palm shell were investigated to determine $K_2$ as a function of filtration velocity. The information on $K_2$ will be used to design the optimum bag filter systems for animal feedstuffs handling in the port.

• Journal of Advanced Navigation Technology
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• v.15 no.4
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• pp.487-494
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• 2011

Data Fusion algorithm is essential in Target Detection using radar, and it has more reliability. In this paper, Multi Radar Fusion algorithm using IMM(Interacting Multiple Model) filter is suggested. This well-known IMM filter has better performance than Kalman filter has. In this simulation, Distributed Data Fusion process was applied, and three sub-filters and one main filter were employed. In addition, this simulation was evaluated by virtual radar data which include constant velocity, constant accelerate, turn rate. The result of an evaluation shows better performance in the maneuvering section of aircraft.

• Journal of Korean Neurosurgical Society
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• v.37 no.1
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• pp.34-38
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• 2005

Objective: Spontaneous intracranial hemorrhage in children is not common and very different compared to adults. We analyze the etiology, hemorrhagic type, clinical features, and outcome of spontaneous intracranial hemorrhage in children. Methods: Twenty-nine patients under 17years of age with nontraumatic intracranial hemorrhage were analyzed retrospectively. Neonates were excepted. We reviewed their medical records in regard to their age, symptoms, radiologic findings, treatment, and prognosis. Results: Among 29 patients, there were 17boys and 12girls. The average age was 10.2years. The most common presenting symptom was mental deterioration, and the most common cause was arteriovenous malformation. Spontaneous intracranial hemorrhage in children showed a better prognosis than in adults. Conclusion: Spontaneous intracranial hemorrhage in children resulted mainly from vascular malformation and the prognosis is relatively good. More careful follow-up studies and active management are needed for better outcomes.

• Journal of Korean Neurosurgical Society
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• v.60 no.3
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• pp.275-281
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• 2017

Treating diseases in the field of neurosurgery has progressed concomitantly with technical advances. Here, as a surgical armamentarium for the treatment of cerebral aneurysms, the history and present status of the keyhole approach and the use of neuroendoscopy are reviewed, including our clinical data. The major significance of keyhole approach is to expose an essential space toward a target, and to minimize brain exposure and retraction. Among several kinds of keyhole approaches, representative keyhole approaches for anterior circulation aneurysms include superciliary and lateral supraorbital, frontolateral, mini-pterional and mini-interhemispheric approaches. Because only a fixed and limited approach angle toward a target is permitted via the keyhole, however, specialized surgical devices and preoperative planning are very important. Neuroendoscopy has helped to widen the indications of keyhole approaches because it can supply illumination and visualization of structures beyond the straight line of microscopic view. In addition, endoscopic indocyanine green fluorescence angiography is useful to detect and correct any compromise of the perforators and parent arteries, and incomplete clipping. The authors think that keyhole approach and neuroendoscopy are just an intermediate step and robotic neurosurgery would be realized in the near future.