센서 네트워크에서 전송범위와 전송방향을 이용한 에너지 효율적인 라우팅 프로토콜

이현준,이영한,이경오,Lee, Hyun-Jun,Lee, Young-Han,Lee, Kyung-Oh 한국정보처리학회 2010 정보처리학회논문지 C : 정보통신,정보보안 Vol.17 No.1

센서네트워크에서 센서는 배터리에 의해 작동이 되며 배터리의 수명이 다하면 더 이상 동작을 할 수 없다. 센서가 수집한 데이터는 효과적인 경로를 통해 싱크노드로 전달되어야 하며 이를 위한 여러 라우팅 알고리즘이 제안되었다. 하지만, 기존의 알고리즘은 데이터를 전송하는데 있어서 전송범위와 전송방향을 고려하지 않기 때문에 많은 노드들이 데이터 전송에 참여하게 되고 결과적으로 많은 에너지를 소모한다. 본 논문에서는 센서 네트워크에서의 효과적인 데이터 전송을 위해 전송범위와 전송방향을 고려한 라우팅 알고리즘인 TDRP(Transmission range and Direction Routing Protocol)를 제안한다. TDRP는 클러스터 또는 그리드를 생성하지 않고, 싱크노드를 중심으로 사분면을 형성하여 패킷의 전송방향을 결정하는 방법으로 네트워크 오버헤드가 적으며, 패킷의 전송방향에 위치하는 노드들 만이 통신에 참여하므로, 에너지 효율성이 기존의 알고리즘들보다 뛰어 나다. Sensors in sensor networks are operated by their embedded batteries and they can not work any more if the batteries run out. The data collected by sensors should be transferred to a sink node through the efficient routes. Many energy efficient routing algorithms were proposed. However, the previous algorithms consume more energy since they did not consider the transmission range and direction. In this paper we propose an algorithm TDRP(Transmission range and Direction Routing Protocol) that considers the transmission range and direction for the efficient data transmission. Since TDRP does not produce clusters or grids but four quadrants and send data to the nodes in one quadrant in the direction of the sink node, it has less network overhead. Furthermore since the proposed algorithm sends data to the smaller number of nodes compared to the previous algorithms, the energy efficiency is better than other algorithms in communication node fields that are located in packet transmit directions.

강건한 송아지 육성을 위한 새로운 이유기술과 관리지침

이현준,Lee, Hyeon-Jun 한국종축개량협회 2007 種畜改良 Vol.12 No.4

조영 전후의 폐 CT 영상 정합을 위한 특징 기반의 비강체 정합 기법

이현준,홍영택,심학준,권동진,윤일동,이상욱,김남국,서준범,Lee, Hyun-Joon,Hong, Young-Taek,Shim, Hack-Joon,Kwon, Dong-Jin,Yun, Il-Dong,Lee, Sang-Uk,Kim, Nam-Kug,Seo, Joon-Beom 대한의용생체공학회 2011 의공학회지 Vol.32 No.3

In this paper, a feature-based registration technique is proposed for pre-contrast and post-contrast lung CT images. It utilizes three dimensional(3-D) features with their descriptors and estimates feature correspondences by nearest neighborhood matching in the feature space. We design a transformation model between the input image pairs using a free form deformation(FFD) which is based on B-splines. Registration is achieved by minimizing an energy function incorporating the smoothness of FFD and the correspondence information through a non-linear gradient conjugate method. To deal with outliers in feature matching, our energy model integrates a robust estimator which discards outliers effectively by iteratively reducing a radius of confidence in the minimization process. Performance evaluation was carried out in terms of accuracy and efficiency using seven pairs of lung CT images of clinical practice. For a quantitative assessment, a radiologist specialized in thorax manually placed landmarks on each CT image pair. In comparative evaluation to a conventional feature-based registration method, our algorithm showed improved performances in both accuracy and efficiency.

효과적인 학습을 위한 메타인지 기반의 온라인 학습 도구 웹사이트 구축

이현준,빈기범,김은서,문일영,Lee, Hyun-June,Bean, Gi-Bum,Kim, Eun-Seo,Moon, Il-Young 한국실천공학교육학회 2022 실천공학교육논문지 Vol.14 No.2

In this paper, this app is an online learning tool web application that helps learners learn efficiently. It discusses how learners can improve their learning efficiency in these three aspects: retrieval practice, systematization, metacognition. Through this web service, learners can proceed with learning with a flash card-based retrieval practice. In this case, a method of managing a flash card in a form similar to a directory-file system using a composite pattern is described. Learners can systematically organize their knowledge by converting flash cards into a mind map. The color of the mind map varies according to the learner's learning progress, and learners can easily recognize what they know and what they do not know through color. In this case, it is proposed to build a deep learning model to improve the accuracy of an algorithm for determining and predicting learning progress.

기획특집_하절기 목장관리 요령 - 유질 저하 예방을 위한 고온기 젖소 사양관리

이현준,Lee, Hyeon-Jun 한국낙농육우협회 2010 낙농·육우 Vol.30 No.7

The Effect of ${\gamma}$-interferon on the Hepatocyte Cytosolic cAMP Level and LDH A Gene Transcription During Regeneration of Rat Liver

이현준,이승기,Lee, Hyun-Jun,Lee, Seung-Ki Korean Society for Biochemistry and Molecular Biol 1990 한국생화학회지 Vol.23 No.3

간의 재생기간 중 감마인터페론의 LDH A 유전자 발현에 대한 억제효과에 대하여 연구하였다. 또한 간 부분 절제 후 감마인터페론에 의한 LDHA 유전자와 DNA 합성억제가 cAMP에 의해 매개될 가능성을 검토하였다. 감마인터페론을 간 부분절제 20시간 전에 쥐 100g당 $1{\times}10^4$ IU의 양으로 복강내 투여하였을 때 간 부분절제 후 21시간에서의 LDH A mRNA 농도와 24시간에서의 DNA 합성을 억제시켰다. Dibutyryl cAMP를 간 부분절제 후 8-12시간에 쥐 100g당 0.5mg의 양으로 복강내 투여하였을 때 감마인터페론에 의해 억제된 LDH A mRNA의 농도와 DNA 합성을 회복시켰다. 그러나 감마인터 페론은 재생간의 cAMP 농도에는 영향을 미치지 않았다. 이상의 결과와 다른 연구결과로부터 간 재생기간 중 감마인터페론의 LDH A 유전자 발현과 DNA 합성에 대한 억제효과는 cAMP에 의해 매개되지 않고 c-myc protooncogene의 발현억제에 의한 효과일 가능성을 제시하고자 한다. We studied the inhibitory effect of ${\gamma}$-interferon on the expression of LDH A gene at the transcriptional level during regeneration of rat liver. Also, we examined the possible involvement of cAMP as a second messenger for the inhibition of LDH A gene expression and DNA synthesis by ${\gamma}$-interferon after partial hepatectomy of rat. ${\gamma}$-interferon ($1{\times}10^4$IU/100g of rat. i.p.) injected at 20 h prior to partial hepatectomy reduced LDH A mRNA concentration at 21 h and inhibited DNA synthesis at 24 h after the partial hepatectomy. Dibutyryl cAMP (0.5 mg/100 g of rat, i.p.) injected at 8-12 h after partial hepatectomy restored both the LDH A mRNA concentration and the DNA synthetic activities which were inhibited by ${\gamma}$-interferon. However, ${\gamma}$-interferon did not affect the cAMP levels determined by RIA method in regenerating rat liver. The above results suggest that during regeneration of rat liver, the inhibitory effects of ${\gamma}$-interferon on the induction of LDH A gene transcription and the DNA synthesis, both of which activities were reported to be regulated by cAMP, may not be mediated by cAMP, but may be mediated by the inhibition of c-myc protooncogene expression.

메치오닌 수산화물의 첨가가 남은 음식물의 보관 중 성상변화에 미치는 영향

이현준,김현섭,정하연,강수원,기광석,조광근,조재순,홍중산,김명국,이홍구,최윤재,Lee, H.J.,Kim, H.S.,Jeong, H.Y.,Kang, S.W.,Ki, K.S.,Cho, K.K.,Cho, J.S.,Hong, Z.S.,Jin, M.G.,Lee, H.G.,Choi, Y.J. 유기성자원학회 2002 유기물자원화 Vol.10 No.3

이 시험은 현재 우리나라 환경문제 중 하나로서 큰 오염원으로 인식되고 있는 남은 음식물의 재활용과 사료로서의 이용성을 높이기 위한 보존재로서 MHA의 적정 사용량을 알아내기 위하여 실시하였다. 소규모 식당에서 발생하는 남은 음식물을 수집하여 methionine 수산화물(MHA)을 처리하여 $40^{\circ}C$ 인큐베이터안에서 40일동안 변화를 관찰하였다. MHA를 원물중량의 1%, 3%, 5% 첨가구를 두고 대조구와 비교하였다. 염도는 MHA 첨가량이 많아질수록 증가하는 경향이 있었으며(p<0.05) pH는 MHA의 첨가량이 많아질수록 낮아지는 경향을 보였다(p<0.05). 휘발성지방산함량에 있어서는 대조구는 30일 이후에 증가하는 경향을 보였고 MHA처리구는 1, 3, 5% 첨가구 모두 15일차까지 감소하고 이후 일정한 함량을 나타내었다. 암모니아태 질소함량은 MHA의 첨가수준이 높을수록 떨어지는 경향을 보였다(p<0.05). 시료의 외관상 변화는는 대조구에서 표면 곰팡이 발생과 연화정도가 심하게 나타내었으며, MHA 첨가구에서는 1%구에서는 표면의 얇은 곰팡이는 나타내었으나 내부는 변화를 보이지 않아 남은음식물의 고온상태에서의 변패 변질 방지를 위해 MHA를 1% 이상 첨가하면 효과가 있는 것으로 나타내었다. This study was carried out to improve the utilization of food wastes known as major source of environmental pollution and to determine proper additional levels of methionine hydroxy analogue(MHA) on food wastes. 1%, 3% and 5% of MHA were added to 3 groups of food wastes gathered from small cafeteria. Each group has 3 reiteration. NaCl contents were tended to get higher as addition levels increased(p<0.05). And pH values were tended to get lower as additional levels increased(p<0.05). $NH_3-N$ contents were significantly decreased as additional levels increased(p<0.05). Total VFA(Volatile Fatty Acid) content was increased after 30 days of storage on control. On MHA treatments(1, 3, 5%), total VFA contents were decreased until 15 days of storage, and kept low values until the end of experiment. In terms of superficial change, mildew covered all over control, and covered by thin mildew on the surface of 1% MHA treatment. No superficial change found on 3% and 5% MHA treatments. In conclusion, over 1% addition of MHA was effective to prevent the decay and degeneration of food wastes.

한국인 안면부 대상포진 환자의 임상양상

이현준,김소영,정문선.Hyun Joon Lee. MD. So Young Kim. MD. Moon Sun Jung. MD 대한안과학회 2010 대한안과학회지 Vol.51 No.1

Purpose: To investigate the clinical characteristics of Korean patients with facial herpes zoster. Methods: The present study enrolled patients with facial involvement among the patients with herpes zoster. The percentage of involved branches of the trigeminal nerve, types and frequency of ocular complications, and changes in visual acuity depending on systemic treatment were analyzed. Results: A total of 146 patients (15.9%) out of 916 patients with herpes zoster were diagnosed with facial herpes zoster. The ophthalmic branch was the most frequently involved (55.5%), and coinfection with the ophthalmic and maxillary branch was also common (31.5%). Ocular complications developed in 82 eyes (56.2%) and were most common in the group of coinfection with the ophthalmic and maxillary branch (Fisher’s exact test, p=0.003). Conjunctivitis (72.0%) was the most commonly observed ocular complication, while punctate keratitis and endothelitis were also frequent. After treatment with a systemic antiviral agent, visual acuity was significantly improved (paired t test, p=0.001). Conclusions: A higher incidence of ophthalmic complications was observed in facial herpes zoster patients with a wider area of involvement, including the ophthalmic branch. There was significant improvement of visual acuity and ocular complications after systemic treatment. Therefore, systemic antiviral treatment should be considered when a broad herpes zoster skin lesion is observed. J Korean Ophthalmol Soc 2010;51(1):8-13

한 마리 한 마리 정성을 다해 먹이는, 개체사양을 위한 젖소 사료급여진단 프로그램

이현준,Lee, Hyeon-Jun 한국낙농육우협회 2006 낙농·육우 Vol.26 No.12

쥐간 재생기간 중 γ - interferon이 hepatocyte cytosolic cAMP의 양과 LDH A 유전자의 발현에 미치는 영향

이현준,이승기 ( Hyun Jun Lee,Seung Ki Lee ) 생화학분자생물학회 1990 BMB Reports Vol.23 No.3

We studied the inhibitory effect of γ-interferon on the expression of LDH A gene at the transcriptional level during regeneration of rat liver. Also, we examined the possible involvement of cAMP as a second messenger for the inhibition of LDH A gene expression and DNA synthesis by γ-interferon after partial hepatectomy of rat. γ-Interferon (1×10⁴IU/100g of rat. i.p.) injected at 20 h prior to partial hepatectomy reduced LDH A mRNA concentration at 21 h and inhibited DNA synthesis at 24 h after the partial hepatectomy. Dibutyryl cAMP (0.5 ㎎/100 g of rat, i.p.) injected at 8-12 h after partial hepatectomy restored both the LDH A mRNA concentration and the DNA synthetic activities which were inhibited by γ-interferon. However, γ-interferon did not affect the cAMP levels determined by RIA method in regenerating rat liver. The above results suggest that during regeneration of rat liver, the inhibitory effects of γ-interferon on the induction of LDH A gene transcription and the DNA synthesis, both of which activities were reported to be regulated by cAMP, may not be mediated by cAMP, but may be mediated by the inhibition of c-myc protooncogene expression.