• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.587-589
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• 2003

이동 통신 시스템의 가장 큰 특징 중의 하나가 이동노드의 이동성을 보장하기 위한 핸드오프 기술이다. 그러나 핸드오프 시에 발생되는 패킷의 손실은 지연에 민감하거나 또는 실 시간성을 요하는 서비스에서 요구하는 조건을 만족시키지 못할 경우가 있다. 이에 이동노드가 외부 네드워크로 이동하는 경우 낮은 지연을 가지는 핸드오프 방법으로 사전등록 핸드오프 방법이 있다. 사전등록 핸드오프는 히스토리 파일에 있는 임의의 한 이동노드가 전에 방문한 셀들에 대한 정보를 사용하여 이동 전에 등록에 관한 패킷을 다음 이동할 셀 외부에이전트에게 미리 전송하고 이동을 하는 방법이다. 그러나 히스토리 파일은 이동노드가 외부네트워크를 방문했던 횟수대로 구성되기 때문에 이를 사용했을 때 잘못된 이동 예측이 발생할 수 있다. 이 논문에서는 이동노드의 외부 네트워크 방문 히스토리를 현 이동노드가 위치한 셀의 기준 값을 고려하고, 방향그래프(Directed graph) 형식으로 작성한 히스토리 파일을 이용하여 잘못된 이동 예측을 방지하는 기법을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.80-82
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• 2000

공간 데이터베이스 관리 시스템에서 제공하는 공간 질의는 많은 디스크 참조와 CPU 처리시간을 필요로 한다. 이 중에서 {{{{k}}}}-최근접 질의는 많은 디스크 참조를 요구하는 질의로써 지금까지 많은 연구가 이루어져 왔다. 트리 구조의 색인을 사용하는 {{{{k}}}}=최근접질의 처리방법은, 조건을 만족하지 않는 노드를 가지 치기 기법을 사용하여 노드 방문 횟수를 줄인다. 그러나, 이 방법은 가지치기 과정에서 불필요한 디스크 참고가 발생하여 성능을 저하시키는 단점을 가지고 있다. 본 논문에서는 가지치기 기법 대신 주어진 {{{{k}}}} 개의 최근접객체가 존재할 영역을 미리 예측함으로써 디스크 참조 횟수를 줄이는 방법을 제시한다. 이 영역을 예측하기 위해서 본 논문에서는 데이터 분포에 대한 밀도를 이용하였다. 실험에 의하면 이러한 방법은 기존의 가지치기 기법을 이용한 방법에 비해서 최고 22%, 평균 7%정도의 디스크 참조 횟수의 감소 효과가 있음을 알 수 있다.

• Journal of Korean Society of Forest Science
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• v.99 no.1
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• pp.36-46
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• 2010

The purpose of this research was to derive political suggestion to increase the demand for forest visit by analyzing the demand of forest visitors, focusing on the residents of Seoul and capital areas. The determinants of demand, which is the number of forest visit in a year, were analyzed by independent variables; six factors from factor analysis on selective attributes, demographic characteristics, and other variables related with the general matters when visiting a forest. As a result, among the independent variables, selective attribute (tourism resource factor), gender (male), and residency (Seoul) were found out to have positive(+) effect on demand for forest visit. However, other selective attribute (external factor of forestry), occupation (white-collar employee), and level of education (over college graduate) were found out to have negative(-) effect on demand for forest visit. Based on these results, implications for the expansion of demand for forest visits were derived.

• Journal of the korean academy of Pediatric Dentistry
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• v.27 no.2
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• pp.202-207
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• 2000

The purpose of study was to compare the caries experience between the mentally retarded(MR) and the normal(N) children and adolescents and to survey the dental visit frequency. preventive dental care, and tooth-brushing behavior of the mentally retarded. Two hundred and fifty MR and two hundred and ten N subjects were selected for the study. 1. The number of teeth which had experienced caries was 3.28 in MR and 4.66 in N. The number of decayed teeth was 2.24 in MR and 1.50 in N. The number of filled teeth was 0.71 in MR and 3.06 in N Filled teeth rate was 19.78% in MR and 58.89% in N The differences between MR and N were all significant(P<0.01). 2. Dental visit frequency of MR was 1.15 per year, and the 51.2% of MR did not visit the dental clinic for the last one year. 38.0% of MR had received the preventive dental care. 3. Toothbrushing frequency per day was 2.16 and the toothbrushing time for 78.3% of MR was less than two minutes. 51.2% of MR brushed their teeth by themselves, 13.3% did with the help of the carers, and 35.5% totally depended on the carers. In conclusion, MR experienced less dental caries than N, had more untreated caries than N, and had need for regular preventive dental care.

• Journal of Hospice and Palliative Care
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• v.19 no.2
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• pp.145-153
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• 2016

Purpose: This study was conducted to investigate patients' characteristics and actual conditions of home-based services offered by a free-standing hospice center. Methods: A retrospective review was performed with the medical records of 75 patients who received home-based hospice care from a free-standing hospice center from January 2014 through December 2014. Results: Most patients (54.7%) were enrolled via self-directed referral. The reason for the service termination was death at home 25.3%, admission to a hospice ward 50.7%, hospitalization 22.6% and patients' refusal 2.7%. Seventy three patients had cancer, and two patients had ALS. Among all, 58.7% were in a dying phase, and 34.7% were almost completely bedfast at the time of their enrollment in this study. When they enrolled, the patients' physical symptoms were characterized as pain (89.4%), sleep disturbance (71.2%), urinary difficulties (35.8%) and defecation difficulties (47.8%). Among all, 77.4% terminated the home visit service within one month. The mean frequency of the home visits was 3.25 (${\pm}3.98$), and less than five in 82.7% of patients. The mean frequency of the phone service was 3.40 (${\pm}3.12$). The frequency of doctor's home visits was $1.21{\pm}0.79$ on average, and the figure increased when patients' conditions turned unstable. Conclusion: It is necessary to develop a home-based hospice care model with consideration of patients' characteristics and the actual service conditions delivered by free-standing hospice facilities.

• Journal of dental hygiene science
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• v.9 no.1
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• pp.17-23
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• 2009

A survey using a questionnaire was conducted among industrial employees in Ulsan Total surveyed persons was 244. The purpose of this study was to analysis the relation and behavior of oral health promotion. Also, This study was to provide educational data of oral health. The obtained were analysed by SPSS program 12.0. The findings were as below: 1. Dental visit for prevention Y/N(%) was higher 50 years than 20 years(p < .001). Oral hygiene devices Y/N(%) for oral hygiene showed University graduates higher than Middle school graduates respectively(p < .05). 2. The knowledge of oral health was higher High school graduates than Middle school graduates respectively(p < .05). The rate of brushing teeth 3~5 times per day was higher females than males(p < .01) and better College graduates than Middle school graduates respectively(p < .001). 3. Oral health conditions of respondents were better 20years and 30years than 50years respectively(p < .001). Self-evaluation of Oral health sensitive was better College graduates than Middle school graduates respectively(p < .05). 4. Correlation between of Tooth brushing Frequency per Day by Oral health knowledge, dental clinic Visit, Extraction number had an effect on the significant dental clinic visit for prevention and the knowledge of Oral health had even a positive effect relationship(r = .233, p = .001). The knowledge of Oral health and the frequency of tooth brushing had even a positive effect relationship(r = .161, p = .05). The frequency of tooth brushing and the number of extraction of teeth had a negative effect relationship(r = -.145, p = .05).

• Journal of the Korean Society for information Management
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• v.19 no.4
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• pp.163-183
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• 2002

The purposes of this study were to examine the features of web fashion magazines and to suggest an effective website model for them. Seven web fashion magazines were analyzed. The evaluating criteria included: contents, design, navigation, and services. In addition, online-questionnaires were sent to 40 end users to obtain the information regarding user behaviors on the elected web fashion magazines. The results show that a suggested model should include various aspects: 1) providing currents information. 2) consistency in design, 3) easy in navigation, and 4) searching function etc.

• Korean Journal of Environment and Ecology
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• v.3 no.1
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• pp.95-106
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• 1989

This paper presented the baseline data to establish visitor management strategy for Kayasan National Park by examining visitor's socio-economic charateristics and use pattern. The user's composition showed that high school or more graduated twenties(20-29 ages) males were respectively domainant. Their activities were, in main, multi-purpose type participated in climbing, camping or picnic, after visiting to the Haein temple. In use pattern, summer visitors were mainly concentrated in and around Haein temple and Hongnyudong valley. But autumn visitors were especially concentrated in Haein temple area.

• Journal of the Korean Association of Geographic Information Studies
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• v.6 no.4
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• pp.59-70
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• 2003

Spatial data base system provides many query types and most of them are required frequent disk I/O and much CPU time. k-NN search is to find k-th closest object from the query point and up to now, several k-NN search methods have been proposed. Among these, MINMAX distance method has an aim not to access unnecessary node by adapting pruning technique. But this method accesses more disks than necessary while pruning unnecessary nodes. In this paper, we propose new k-NN search algorithm based on density of object. With this method, we predict the radius to be expected to contain k-NN objects using density of data set and search those objects within this radius and then adjust radius if failed. Experimental results show that this method outperforms the previous MINMAX distance method. This algorithm visit less disks than MINMAX method by the factor of maximum 22% and average 7%.

• The Journal of the Korea Contents Association
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• v.13 no.9
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• pp.322-333
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• 2013

This study aimed at analyzing and understanding medical tourism patients' pattern of different countries. For this purpose it followed up the international patients who visited W hospitals for spine treatment for last 3 years. In additon, it proposed key marketing strategies for attraction of more patients in the future. Satisfaction survey for 91 foreigner hospitalized patients were conducted from year 2010 to 2011. Each country of the patients showed slightly different motivations of visiting, consumer pattern and satisfaction of medical and non medical services. The current study analyzed factors, socio-demographic characteristics, purposes of visit, duration of stay in Korea, total number of visits to Korea, companions, plan of care, reasons for choice of W Hospital, expenses for medical care, total cost of staying in Korea. The results of this study showed that patients visited Korea more frequently were more satisfied with the medical care. Patients who planned to use medical care prior to visit Korea were more satisfied. Patients who thought he/she paid reasonable medical cost were more satisfied. Invitation to familiarization tour, clarification of medical cost, and provision of high quality medical care were recommended for the higher satisfaction of foreign patients. Fostering of specialized hospitals were recommended.