• Journal of Korea Multimedia Society
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• v.15 no.11
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• pp.1358-1368
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• 2012

A tag sequence estimation scheme is to estimate the physical sequence of passive RFID tags that are linearly spread using the movement of a RFID reader. Since RFID readers communicate with the passive tags by very weak radio waves, scanning passive tags are unstable. In this paper, we applied round-trip scanning of a reader to enhance the tag sequence estimation. Proposed scheme first determines the turning point of the reader movement, and then estimates the sequence of the tags using the tag sets scanned in each read cycles. Test experiments show that the proposed scheme can improve the estimation accuracy.

• Journal of Advanced Navigation Technology
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• v.2 no.2
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• pp.84-99
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• 1998

As a part of closed-loop guidance law studies for anti-ballistic missile defense, a mid-course guidance law is proposed to engage the target with the predetermined attitude for increased terminal effectiveness. The proposed guidance law is based on the predicted target position calculated from a simplified solution of target motion and the estimates of an extended Kalman filter utilizing noisy nonlinear radar measurements. Extension of the proposed mid-course guidance to 3 dimensional engagements are also studied. Performance of the proposed mid-course guidance law together with a terminal guidance law in the form of conventional proportional navigation guidance is evaluated by a series of simulation studies.

• Journal of Advanced Navigation Technology
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• v.4 no.1
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• pp.67-77
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• 2000

This paper proposes a reduction scheme for codebook search time in the adaptive codebook using wavelet transformed coefficients. In a CELP coder, pitch estimation with a combined open loop and closed loop search in adaptive codebook needs a lengthy search. More precisely, the pitch search using autocorrelation function over all possible ranges has been shown inefficient compared to the consuming time. In this paper, we propose a new adaptive codebook search algorithm which ensures the same position for the pitch with maximum wavelet coefficient over various scaling factors in Dyadic wavelet transform. A new adaptive codebook search algorithm reduces 25% conventional search time with almost the same quality of speech.

• Journal of Advanced Navigation Technology
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• v.16 no.4
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• pp.709-716
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• 2012

Recently, smartgrid has interested in enable to existing electrical grid to supplying stably and efficient energy management. Smartgrid environment using PLC is transmit PLC module collected electricity consumption information in each house from PLC module to server. This communication process can occurred security threats such as personal information leak of consumer, electrical grid paralysis. In this paper, we propose efficient electricity consumption information transmission protocol with ID-based key distribution method for respond to security threats.

• Journal of Advanced Navigation Technology
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• v.12 no.1
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• pp.22-27
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• 2008

This paper presents adaptive-MMOSPRED method for prediction of resource demands requested by multimedia calls, and shows the performance of the call admission control based on proposed resource prediction method in multimedia wireless networks. The proposed method determines (I-CDP) random variables of the standard normal distribution by using LMS algorithm that minimize errors of prediction in resource demands, while parameters in an existing method are constant all through the prediction time. Our simulation results show that prediction error in adaptive-MMOSPRED method is much smaller than in fixed-MMOSPRED method. Also we can see via simulation the CAC performance based on the proposed method improves the new call blocking performance compared with the existing method under the desired handoff dropping probability.

• Journal of Advanced Navigation Technology
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• v.12 no.2
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• pp.115-121
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• 2008

In this paper, we analysis the error performance improvement of the FS MC-CDMA, whose information data are spread spectrum with direct sequences(DS), and each subband signal is transmitted using a subcarrier frequency, combining BCH code in Mobile communication channels which is characterized by Nakagami fading. The effect of co-channel interference on the block error performance is also studied in this paper. As a results of study, the coding techniques provides more efficient improvement than non-coding, but the coding techniques are required more band as many coding rate. Our study demonstrates that the system is combined coding techniques, the amount of improvement is capable of efficiently exploiting over the Nakagami fading.

• Journal of Advanced Navigation Technology
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• v.24 no.2
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• pp.121-127
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• 2020

In this paper, we propose a dynamic spectrum hole grouping method that changes the grouping range of spectrum hole according to the resources amount required by secondary users in wideband spectrum cognitive wireless networks, and then the proposed method is applied to channel allocation for the secondary user service. The proposed method can improve waste of resources in the existing static spectrum hole grouping in virtue of grouping dynamically as much the predicted spectrum holes resources as secondary users require. Simulation results show that channel allocation method with the proposed dynamic grouping outperforms that with the static grouping method in resources utilization under acceptable secondary user service performance.

• Journal of Nutrition and Health
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• v.15 no.1
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• pp.54-61
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• 1982

나성의 한국 이주민의 자녀로서 사춘기에 문화권을 바꾸는 경험을 갖은 57인의 중고등 학생들을 대상으로 실시된 본 조사는 대상자의 1 ) 일반적 특성의 파악 2 ) 식습관 및 기호조사, 식품 섭취 빈도 조사 3 ) 영양지식 및 그들 어머니의 영양지식 조사 4 ) 영양실태 조사를 통하여 식생활의 변화 및 문제점을 찾아보았다. 영양실태 조사는 24-hour diet recall 방식에 의하여 기본 4군, meal pattern 및 영양소를 추산하여 한국과 미국의 RDA와 비교하였다. 위의 실태조사 결과를 요약해 보면 ; 1) 한국전통음식인 밥과 김치는 저녁식사시 모두 섭취하고 있으나 아침, 점심은 미국식단의 사용율이 높았다. 기호도 조사에 의하면 전반적으로 미국음식보다 한국음식을 더 좋아한다고 하였다. 2) 여학생은 아침식사, 남학생은 저녁식사가 불규칙하였다. 3) 여학생은 풍부한 과일의 섭취가, 남학생은 우유의 섭취가 한국에서의 식습관에 비해 그들의 건강을 위해 좋다고 하였다. 4) 영양지식의 근원은 어머니로부터가 가장 높았다. 여학생들은 철분의 근원식품에 관한 지식이 남학생보다 부족했으며, 균형된 식단의 선택 접수는 남학생보다 여학생이 높았다. 5) 기호조사 결과에 의하면 가장 싫어하는 식품은 간, 칠면조, 돼지고기, 고형 요구르트, 아보카도, 올리브 등이었고, 한번도 먹어보지 않은 식품은 부로콜리, 우설, 양고기, 망고, 탈지분유 등이었다. 이들 어머니의 기호조사 결과는 자녀들과 흡사하였으나 어머니들은 미국식품 중 한번도 시도해 보지 않은 식품의 수가 그들 자녀보다 많았다. 6) 24시간 diet recall 방법의 분석에 의하면 결핍된 영양소는 열량, 철분, 비타민 A였다. 단백질 섭취량의 증가는 현저하였으나, 낮은 열량의 섭취는 이주민의 자녀의 불규칙한 식습관의 일면과 동시에 우리나라 남학생들의 조리방법의 미숙한 면을 보여주었다.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.05
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• pp.47-50
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• 1997

We synthesized N-Hydroxysuccinimidyl (NHS) azidobenzoate as a cross-linking reagent for immobilization of peptide onto the solid surface. Thin polystyrene(PS) films spin-coated with a NHS azidobenzoate solution were exposed with ultraviolet light at 245nm$(3.3mW/cm^2)$ for 5 min. The NHS active ester groups became covalently attached to the polymer via photogenerated, highly reactive nitrene intermediates derived from NHS azidobenzoate. Using this technique, it is demonstrated that well-defined surface regions can be functionalized with a minimum observable feature size of 1mm for UV exposure. Through reaction of this functionalized PS surface with primary amine-containing biomolecules, biological molecule had been immobilized on the polymer surface.

• The Korean Journal of Physiology and Pharmacology
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• v.8 no.6
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• pp.345-349
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• 2004

Heat shock ($43^{\circ}C$ for 60 minutes) is sufficient to induce apoptosis in a wide number of cell lines. In this study, we asked whether DNA strand breaks are responsible for this phenomenon. Using the highly sensitive comet assay for DNA damage detection, we were unable to demonstrate DNA breaks immediately after heat shock in Raji human Iymphoid cells. It showed that DNA breaks were not necessary for hyperthermic apoptosis, since its activity is indicative of DNA lesions. Here, we present a suggestion that a protein(s) is the major target for heat shock apoptosis. We firstly found glycerol, which reportedly stabilizes protein structure, showed a protective effect in Raji cells against hyperthermic apoptosis. In addition, quercetin, which modulates transcription of the heat shock protein family members, enhanced apoptotic death induced by hyperthermia. Furthermore, Raji cells are protected by a pre-mild heat treatment prior to the killing dose of heat shock.