• 한국과학교육학회지
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• 제29권6호
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• pp.741-750
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• 2009

개화기는 우리나라에서 과학교육이 도입되고 전개되던 시기이다. 당시 발간된 과학 교과서는 한국 근대 학교 과학교육에서 중요한 역할을 하였다. 이런 의미에서 과학교과서를 저술하였거나, 발행한 이들은 개화기 한국의 과학 교육을 주도한 중심인물들이었다고 여겨지는데, 이들 중에 역관이었던 현채와 그의 아들 현공염이 있다. 현채는 역관 집안에서 태어나 역과에 급제하였고, 역관 관련 관직을 거쳤으며, 외국어학교, 한성사범학교 부교관으로 있었다. 학부에서는 번역 및 저술 업무를 수행하였다. 현채가 저역술 또는 출판한 순수과학도서로 26종이 된다. 그 중 이과교과서는 자연과학의 전 분야를 다루어 학생들이 반드시 알아야할 지식을 적절한 방법으로 제시하였으며 학생들의 흥미를 유발하였다. 또한 실험을 제시하여 오늘날 과학교과서와 비교할 때 전혀 손색이 없었다. 과학교과서를 저역술한 현채의 과학교육활동은 그를 사학계에서 이중적으로 평가하는 것과는 달리, 개화기 과학교육이 정립되는 시기에 매우 중요한 역할을 하였음을 알 수 있다. 그것은 당시 과학교과서가 부족했기 때문에 과학이라는 새로운 학문의 보급에 있어 과학교과서의 저역술과 출판 활동은 큰 의의가 있는 것이다. 나아가 과학교과서의 편저자나 발행자 중 외국어를 알고, 외국과의 교류 주체 중 중요 인물이었던 역관 현채의 역할과 그의 과학교육 활동은 우리나라 과학 교육의 역사 중 일부분이 되었다고 평가할 수 있다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제42권4호
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• pp.193-204
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• 2016

Objectives: This study examined the statistical relevance of whether the systemic predisposing factors affect the prognosis of surgical treatment of bisphosphonate-related osteonecrosis of the jaw (BRONJ). All cases had undergone bone biopsies to determine the characteristics of the mechanisms of BRONJ by optical microscopy. Materials and Methods: The data included 54 BRONJ cases who underwent surgery and in whom bone biopsies were performed. The results of surgery were evaluated and the results were classified into 3 categories: normal recovery, delayed recovery, and recurrence after surgery. The medical history, such as diabetes mellitus, medication of steroids, malignancies on other sites was investigated for an evaluation of the systemic predisposing factors in relation to the prognosis. The three factors involved with the medication of bisphosphonate (BP) were the medication route, medication period, and drug holiday of BP before surgery. The serum C-terminal cross-linking telopeptide (CTX) value and presence of microorganism colony in bone biopsy specimens were also checked. Statistical analysis was then carried out to determine the relationship between these factors and the results of surgery. Results: The group of patients suffering from diabetes and on steroids tended to show poorer results after surgery. Parenteral medication of BP made the patients have a poorer prognosis after surgery than oral medication. In contrast, the medication period and drug holiday of BP before surgery did not have significance with the results of surgery nor did the serum CTX value and presence of microorganism colony. Necrotic bone specimens in this study typically showed disappearing new bone formation around the osteocytic lacunae and destroyed Howship's lacunae. Conclusion: Although many variables exist, this study could in part, predict the prognosis of surgical treatment of BRONJ by taking the patient's medical history.

• Journal of Oral Medicine and Pain
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• 제33권1호
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• pp.49-57
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• 2008

저자는 2006년부터 2007년까지 부산대학교병원 구강내과 구강안면동통클리닉에 내원한 외래환자중 BMS환자 59명과 대조군으로는 저자의 클리닉에 내원한 치과신환 94명과 일반시민 92명을 대상으로 간이정신진단검사를 실시하여 다음과 같은 결론을 얻었다. 1. BMS환자군, 치과신환군, 일반시민군은 정상범위내에 있었다. 2. BMS환자군은 HOS척도, PHOB척도에서 낮은 척도를 보이는 유의한 차이가 있으며, PAR척도, PSY척도에서 가장 낮은 척도를 나타내는 경향이 있었다. 3. BMS환자군의 남성에서는 HOS척도에서, 여성에서는 PHOB척도에서 가장 낮았다. 4. BMS환자군의 여성척도군에서 SOM척도, O-C척도, DEP척도, ANX척도, PSY척도에서 더 높은 수치를 나타내었다. 5. BMS환자군의 급성군과 만성군으로 비교하였을때 별다른 점이 관찰되지 않았다.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제9권1호
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• pp.1-8
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• 2020

열화상 장비는 빛이 없는 암흑 상태에서도 물체에서 발산하는 적외선을 탐지하여 이를 영상으로 제공하는 장비이다. 이러한 장점으로 기존 활용되던 군사 분야와 더불어 자동차 및 감시시스템 등 다양한 민수 분야로 활용분야가 넓어지고 있다. 본 논문에서는 상용 이미지 처리 프로세서를 이용한 열화상 이미지 처리 모듈을 제안한다. 제안한 모듈은 기존 FPGA 기반 열화상 이미지 모듈대비 약 10~20%의 성능향상을 보이며, 대기모드를 포함하면 최대 50%까지 성능향상을 보인다. 그리고 시스템 모듈화를 통한 높은 확장성을 보장한다. 뿐만 아니라 제안한 모듈은 기존의 FPGA 기반 모듈의 단점인 낮은 확장성과 재활용성을 보완함으로써 개발 기간 및 비용 단축, 다양한 응용이 가능하다. 따라서, 이러한 장점으로 다양한 고객의 요구사항 만족, 제품 설계 및 개발 일정 단축 등 다양한 이점을 얻을 것으로 기대한다.

• 대한예방의학회:학술대회논문집
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• 대한예방의학회 1994년도 교수 연수회(역학)
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• pp.313-319
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• 1994

Phase I of the Trials of Hypertension Prevention was a multicenter, randomized, controlled trial designed to determine the efficacy of seven nonpharmacologic interventions in reducing blood pressure among persons with high-normal diastolic blood pressure. the initial goal for recruitment was to enroll 2,100 participants over a nine-month period. The yield from the first screening visit to randomization was 13% overall, with clinic-specific yields ranging from 4.5% to 31.7%. After five months of recruitment, approximately 60% of the goal for that point in the recruitment timetable had been randomized. Clinical centers falling short of their goals at that time altered their recruitment strategies and intensified their efforts, and centers that had exceeded their goals recruited additional participants. As a result, 2,182 participants, or 104\% of the goal for recruitment, were randomized over a 13-month period. Those clinics using a cohort, or wave, type of enrollment were most successful in achieving their recruitment goals within the prescribed timetable.

• 한국작물학회지
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• 제58권4호
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• pp.443-450
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• 2013

Effects of newly developed functional rice grains Goami (high-amylose rice) and Nokwon (green-kerneled rice) on the glucose metabolism and antioxidative defense system in C57BL/6N mice under high fat diet condition were investigated. Animals were randomly divided into five groups (n = 8) and given experimental diets for eight weeks: normal control diet (NC), high fat diet (HF), and high fat diet supplemented with white rice (HF-WR), Goami rice (HF-GR), and Nokwon rice (HF-NR). At the end of the experimental period, the HF group exhibited markedly higher blood glucose level, insulin concentration, plasma lipid peroxidation and lower hepatic glycogen concentration than that exhibited by NC group. However, diet supplementation of Goami and Nokwon suppressed the high fat diet-induced hyperglycemia and oxidative stress through inhibition of the glucose-regulating enzymes and enhancement of the antioxidant enzymes activities. The results illustrate that the new functional rice Goami and Nokwon may be useful in the development of functional foods with preventive effect against high fat diet-induced hyperglycemia and oxidative stress.

• 한국인터넷방송통신학회논문지
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• 제14권4호
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• pp.227-232
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• 2014

인터넷 기술이 발전되고, 보편화 되면서 상업과 자본의 대형화가 이루어져 대형 포털 사이트들이 등장하고 성장하게 되면서 인터넷상에서 시간이 흘러도 삭제되지 않는 개인정보 때문에 심각한 사생활 침해문제 등 새로운 위험요소가 제기되고 있다. 특히 마녀사냥 같은 개인의 신상 털기는 피해 당사자가 정상적인 생활이 불가능할 정도의 중대한 문제로 부각되고 있다. 따라서 본 논문에서는 국내외 사례분석을 통하여 개인이 온라인 사이트에 올라와 있는 자신과 관련된 정보 삭제를 요구할 수 있는 권리의 필요성과 국내 도입방안 및 적용에 관한 개선방안을 제안한다.

• Smart Structures and Systems
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• 제20권3호
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• pp.303-309
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• 2017

Structural control through seismic isolation using elastomeric rubber bearing, which is also known as High Damping Rubber Bearing (HDRB), has seen an increase in use to provide protective from earthquake, especially for new buildings in earthquake zones. Besides, HDRB has also been used in structural rehabilitation of older yet significant buildings, such as museums and palaces. However, the present design approach applied in normal practice has often resulted in dissimilar HDRB dimension requirement between structural designers and bearing manufacturers mainly due to ineffective communication. Therefore, in order to ease the design process, most HDRB manufacturers have come up with catalogs that list all necessary and relevant product lines specifically for structural engineers to choose from. In fact, these catalogs contain physical dimension, compression property, shear characteristic, and most importantly, the total rubber thickness. Nonetheless, other complicated issues, such as the relationship between target isolation period and displacement demand (which determines the total rubber thickness), are omitted due to cul-de-sac fixing of these values in the catalogs. As such, this paper presents a formula, which is derived and extended from the present design approach, in order to offer a simple guideline for engineers to estimate the required HDRB size. This improved design formula successfully minimizes the discrepancies stumbled upon among structural designers, builders, and rubber bearing manufacturers in terms of variation order issue at the designing stage because manufacturer of isolator is always the last to be appointed in most projects.

• 한국멀티미디어학회논문지
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• 제13권6호
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• pp.911-923
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• 2010

In wireless sensor networks (WSNs), cluster based data routing protocols have the advantages of reducing energy consumption and link maintenance cost. Unfortunately, most of clustering protocols have been designed for uniformly distributed sensor networks. However, some urgent situations do not allow thousands of sensor nodes being deployed uniformly. For example, air vehicles or balloons may take the responsibility for deploying sensor nodes hence leading a normally distributed topology. In order to improve energy efficiency in such sensor networks, in this paper, we propose a new cluster formation algorithm named DAEEC (Density Aware Energy-Efficient Clustering). In this algorithm, we define two kinds of clusters: Low Density (LD) clusters and High Density (HD) clusters. They are determined by the number of nodes participated in one cluster. During the data routing period, the HD clusters help the neighbor LD clusters to forward the sensed data to the central base station. Thus, DAEEC can distribute the energy dissipation evenly among all sensor nodes by considering the deployment density to improve network lifetime and average energy savings. Moreover, because the HD clusters are densely deployed they can work in a manner of our former algorithm EEVAR (Energy Efficient Variable Area Routing Protocol) to save energy. According to the performance analysis result, DAEEC outperforms the conventional data routing schemes in terms of energy consumption and network lifetime.

• 대한의용생체공학회:의공학회지
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• 제28권4호
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• pp.449-454
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• 2007

An electrohydraulic (EH) pump-driven closed-loop blood pressure regulatory system was developed based on flow-mediated vascular occlusion using the vascular occlusive cuff technique. It is very useful for investigating blood pressure-dependant physiological variability, in particular, that could identify the principal mediators of renal autoregulation, such as tubuloglomerular feedback (TGF) and myogenic (MYO), during blood pressure regulation. To address this issue, renal perfusion pressure (RPP) should be well regulated under various experimental conditions. In this paper, we designed a new EH pump-driven RPP regulatory system capable of implementing precise and rapid RPP regulation. A closed-loop servo-controlwas developed with an optimal proportional plus integral (PI) compensation using the dynamic feedback RPP signal from animals. An in vivo performance was evaluated in terms of flow-mediated RPP occlusion, maintenance, and release responses. Step change to 80 mmHg reference from normal RPP revealed steady state error of ${\pm}3%$ during the RPP regulatory period after PI action. We obtained rapid RPP release time of approximately 300 ms. It is concluded that the proposed EH RPP regulatory system could be utilized in in vivo performance to study various pressure-flow relationships in diverse fields of physiology, and in particular, in renal autoregulation mechanisms.