• Journal of the Korean Society for Library and Information Science
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• v.46 no.3
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• pp.233-250
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• 2012

The purpose of this study is to assess the development, current states, and problems of MEDLIS document delivery service. With the analysis of MEDLIS transaction data from 2001 to 2011, we identified continuous usage decrease, unbalanced contribution by type of institution, high dependence on back issues, use differences among subfields of medicine, relatively low success rate, and various reasons for failure. Based on the results, recommendations for the maintenance of union catalog database, technical support for search capability enhancements, establishment of back issue archiving policy, user training and publicity, and membership expansion are suggested to promote the service.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06a
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• pp.130-133
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• 2010

본 논문에서는 유전 알고리즘의 성능 향상을 위해 교배(Crossover) 기법의 중요 매개변수인 교배 교차점(Crossover Point)의 수를 개체군(Population)의 진화 과정 중에 적응적으로 변화 할 수 있는 자기-적응형(Self-Adaptive) 교배 기법을 제안한다. 이를 위해 제안 교배 기법은 전체 개체군을 다수개의 작은 개체군들로 군집화(Grouping)하여 일차적으로 서로 다른 교차점을 갖는 교배 기법을 적용시키고, 그 후 각 군집의 개체(Individual)들의 선택률을 기반으로 군집들간의 경쟁을 수행한다. 이는 유전 알고리즘이 개체군의 진화 과정 중에 문제에 적합한 교차점을 갖는 교배 기법을 적응적으로 사용할 수 있도록 한다. 또한 제안 교배 기법은 진화 과정 중에 교차점이 지속적으로 변화되므로 알고리즘 초반에는 높은 탐색 능력을 보유하게 되고 후반에는 높은 부분-해(Building-Block) 보존 능력을 지니게 되어, 최적 해(Optimal Solution)로의 수렴 능력이 향상된다. Deceptive 문제를 통해 제안 자기-적응형 교배 기법과 기존 (고정 교차점) 교배 기법의 성능을 비교 하였으며, 실험 결과로부터 제안 교배의 성능 우위를 확인하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.413-417
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• 2007

Ad hoc 센서 네트워크에서 노드는 제한된 에너지를 가지며, 에너지의 사용률은 토폴로지 구조나 센서 노드의 동작에 의존한다. 본 논문에서는 low power distributed MAC을 개량 하여, MANET에서 clustering 구조의 네트워크를 위한 효율적인 에너지 절약을 위한 새로운 구조를 제안한다. 본 제안된 구조의 특징은 Ad hoc 네트워크에서 에너지에 관련된 배터리 파워나, 노드의 거리, 전송 전력 등의 정보를 활용한 상황 인식을 사용하였다. 에너지 상황 인식을 적용한 제안된 망의 구조는 clustering 형상과 메시지 전송의 성능 및 데이터의 도달 인식을 향성 시킨다. 또한 context aware computing을 이용함으로써, 상황과 정의된 rule에 따라서 노드의 동작과 네크워크 라우팅의 상황에 적응하도록 노드를 조정 할 수 있는 구조이다.

• Journal of Chest Surgery
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• v.43 no.4
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• pp.433-436
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• 2010

Acute massive pulmonary artery embolism after pulmonary resection is very rare, but has a high mortality rate. This is one of the most severe complications after pulmonary resection. Acute pulmonary artery embolism developed suddenly in a patient who underwent lobectomy and was recovering without complications. Because the patient’s condition was aggravated after conservative treatment, we did emergency open embolectomy which was successful. Hence, we report this case with a literature review.

• Journal of Chest Surgery
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• v.43 no.4
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• pp.462-465
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• 2010

Acquired bronchoesophageal fistula rare. Conservative treatment such as endoscopy is widely used. The recurrence rate after endoscopic treatment, however, is not well known. We report here on a case of a 54-year-old female who presented with recurrent bronchoesophageal fistula after endoscopic treatment that filled the fistula tract with $Histoacryl^{(R)}$.

• 한국지구과학회:학술대회논문집
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• 2006.02a
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• pp.111-115
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• 2006

최근 경기도 가평지역에서 새로운 철운석이 발견되었으며, 이는 한반도에 낙하(fall) 또는 발견(find)된 운석 중 다섯 번째 기록이다. 가평운석(가칭)은 북위 $37^{\circ}52'08'$, 동경$127^{\circ}27'54'$, 고도 147m 지점에서 발견되었으며, 운석의 분류상 철운석에 속한다. 가평운석의 표면은 지표상에서 풍화를 받은 흔적이 나타나나, 내부는 비드만스태튼 무늬(Widmanstatten pattern)와 같은 철운석의 특징이 잘 보존되어 있다. 가평운석의 암석학적, 광물학적 기재와 분류를 위해 주사전자현미경(Scanning Electron Microscope) 및 전자 현미분석기(electron probe micro-analyzer)를 이용했다. 풍화의 산물인 철산화물이 나타나는 최외각부를 제외하면 가평 운석은 거의 순수한 철-니켈 금속광물(Fe-Ni metal)로 이루어져 있다. 이 중 니켈 함량이 적은 카마사이트(kamacite)가 대부분이며 소량의 태나이트(taenite)가 산출되어 비드만스태튼 무늬를 구성한다. 비드만스태튼 무늬의 특징에 의한 분류에 따르면 가평운석은 중립질 또는 조립질 옥타헤드라이트(octahedrite)에 속한다. 철운석은 화학적으로 열 개 이상의 하부그룹으로 세분되며, 가평운석의 정확한 하부그룹으로의 분류는 친철원소에 대한 미량분석이 추가적으로 필요하다. 가평운석의 냉각률은 $^{\sim}1^{\circ}C/Ma$이하로 나타나며, 이는 가평운석이 천천히 냉각된 비교적 규모가 큰 소행성의 핵에서 유래했음을 지시한다.

• Journal of Korean Society for Geospatial Information Science
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• v.4 no.2 s.8
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• pp.173-180
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• 1996

In a grid based data transformation, the different gridding methods provide different interpretations of scattered data because each method calculate grid node values using a different weighted mathematical algorithms. Therefore, it is necessary to review the interpolated characteristics of some gridding methods according to search distance, search area and search options before determing the best method with a data set. For this, in this paper, six different gridding methods with the same search conditions are applied to a scattered data obtained from sterro-plotter. The interpolated characteristics of the scattered geographic data considered through comparison of coincidence between the data point and the grid node being interpolated. And also, shows the real application of gridding methods through calculating volumes and creating cross sections.

• Archives of Plastic Surgery
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• v.36 no.6
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• pp.685-690
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• 2009

Purpose: Autologous fat graft is a widely accepted technique used for soft tissue augmentation. Nonetheless, the use of fat graft is limited by unpredictable survival rates and repeated grafting. To avoid repeated grafting, cryopreserved fat graft technique has recently been widely used. On the other hand, the number of patients with chronic infection(who received cryopreserved fat injection) has currently been increasing. Therefore, this study was focused on the safety of cryopreserved fat injection from the infection. Methods: We collected 150 samples from local aesthetic clinics to examine the safety of cryopreserved autologous fat. To test for microbacterial contaminations of the cryopreserved fat specimens, microbacterial cultures & antibiotics sensitivity tests were performed. Then, we examined possible correlation between the preservation period and donor sites, focused on the results of microbacterial culture. Results: Cultures were positive for Staphylococcus epidermidis in 5 samples(methicillin - resistant Staphylococcus epidermidis in 4 samples), Micrococcus species in 3 samples. An average duration of preservation was 191 days and there was no significant correlation between the duration of preservation and microbacterial growth. Conclusion: Staphylococcus epidermidis was the leading cause of cryopreserved fat contamination, and the resistance to methicillin is common. Based on the above results, aseptic handling of fat during harvesting and preservation appeared to be most important.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.4
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• pp.1041-1047
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• 2010

One of the weaknesses of ad hoc network is that a route used between a source and a destination is to break during communication. To solve this problem, one approach consists of selecting routes whose nodes have the most stable link cost. In this paper proposes a new method for improving the low power distributed MAC. The method is rule-based on the context awareness of the each nodes energy in clustering. The proposed networks scheme could get better improve the awareness for data to achieve and performance on their clustering establishment and messages transmission.

• Clinical and Experimental Reproductive Medicine
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• v.17 no.2
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• pp.129-135
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• 1990

This study was done to verify factors affecting viability after cryopreservation and pregnancy rate after frozen-thawed embryo transfer into uterus. Embryos were cryopreserved slow freezing and slow thawing and used DMSO as cryoprotectant. The results were to follows. 1. Viability of frozen-thawed embryos were 75.5% (94/105), which compared with viability of embryos according to cell stage, $2{\sim}5$ cell was 68.4% and $6{\sim}16$ cell 80.4% were significant differences (p<0.05). 2. No significant difference in duration of cryopreservation on effects affecting pregnancy rate was observed. 3. Number of embryo transfered into uterus was significant differences (p<0.05). 4. Four pregnancies resulted following replacement of 35 frozen-thawed.