• 정보처리학회논문지B
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• 제11B권5호
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• pp.611-618
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• 2004

본 논문에서는 인터넷상의 대용량 자료에서 원하는 정보를 검색하기 위한 지원 기능으로서 분산 객체지향 데이타베이스에서 클래스를 분할하여 여러 사이트에 분산시키는 기법에 관하여 설계 및 구현하였다 제안된 분산 기법은 클래스의 분할 과정과 할당 과정으로 구성된다. 클래스의 분할 과정에서는 메소드, 계승 및 복합 객체와 같은 객체지항 데이터베이스의 특성을 반영하여 클래스를 분할하였으며 할당 과정에서는 저장, 질의 처리 및 전송비용을 고려하여 할당수식을 정의하였으며 이를 유전자 알고리즘을 이용하여 구현하였다.

• 대한치과교정학회지
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• 제35권1호
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• pp.15-22
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• 2005

본 연구의 목적은 한국인 부정교합자에서 하악 치열궁간의 형태적 차이를 알아보고자 하였다. I급 114명, II급 119명, III급 135명의 부정교합자를 대상으로 하악 모형의 교합면을 복사한 후 13개의 접촉점 중에서 가장 협측면으로 위치한 부분을 digitize 하였고 각 치아의 브라켓 위치에 해당하는 점을 하악치아의 두께에 의거하여 4개의 선계측과 2개의 비율을 측정하였다. 치열궁의 형태는 square ovoid tapered형으로 분류하여 그 빈도를 조사한 결과 Angle 분류와 남녀 성별에 따른 특별한 치열궁 형태가 존재하지 않았으나 특정 치열궁 형태의 빈도는 Angle 분류에 따라 다르게 나타났다. 치열궁 크기의 계측항목에서는 대구치간 폭경에서만 남녀 성별 차이를 보였으며, 치열궁 크기에 있어서 I급과 III급. II급 부정교합군간에는 유의한 차이가 있었다 치열궁 형태의 분포는 I급과 III급 부정교합군에서는 square ovoid, tapered 형태 순이었고. II급 부정교합군은 square, tapered ovoid 형태 순이었다 치열궁 형태의 빈도분포에 있어서는 남녀간의 차이는 없었다.

• 한국통계학회:학술대회논문집
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• 한국통계학회 2000년도 추계학술발표회 논문집
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• pp.5-12
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• 2000

Meta-analysis refers to quantitative methods for combining results from independent studies in order to draw overall conclusions. We consider hierarchical models including selection models under a skewed heavy tailed error distribution and it is shown to be useful in such Bayesian meta-analysis. A general class of skewed elliptical distribution is reviewed and developed. These rich class of models combine the information of independent studies, allowing investigation of variability both between and within studies, and weight function. Here we investigate sensitivity of results to unobserved studies by considering a hierarchical selection model and use Markov chain Monte Carlo methods to develop inference for the parameters of interest.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권8호
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• pp.2894-2909
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• 2015

As the number of mobile devices such as smart phones and tablets explodes, the need for new services or applications is also rapidly increasing. Smart class application is one of the emerging applications, in which most of contents are distributed to all members of a class simultaneously. It is highly required to select relay nodes to cover shadow area of radio as well as extend coverage, but existing algorithms in a smart class environment suffer from high control packet overhead and delay for exchanging topology information among all pairs of nodes to select relay nodes. In addition, the relay selection procedure should be repeated in order to adapt to the dynamic topology changes caused by link status changes or device's movement. This paper proposes the learning based relay selection algorithm to overcome aforementioned problems. The key idea is that every node keeps track of its relay quality in a fully distributed manner, where RQI (Relay Quality Indicator) is newly defined to measure both the ability of receiving packets from content source and the ability of successfully relaying them to successors. The RQI of each node is updated whenever it receives or relays broadcast packet, and the node having the higher RQI is selected as a relay node in a distributed and run-time manner. Thus, the proposed algorithm not only removes the overhead for obtaining prior knowledge to select relay nodes, but also provides the adaptability to the dynamic topology changes. The network simulation and experimental results prove that the proposed algorithm provides efficient and reliable content distribution to all members in a smart class as well adaptability against network dynamics.

• 한국산림과학회지
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• 제99권5호
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• pp.736-743
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• 2010

This study examined the ecological attributes of classified forest community by cluster analysis in the mixed forest of Mt. Seokbyung Experimental Forest of Gangwon-Do. The vegetation data were collected in randomly established 51 sample plots (2.04 ha) and analysis adopted the cluster analysis, importance value index, and Shannon's diversity index. Main results were as follows; 1) the study area was classified into 4 clusters (A, B, C and D). 2) The cluster A was dominated by Pinus densiflora with an importance value of 71.6%. The most dominant species in the cluster B and cluster C were Larix leptolepis (57.1%) and Quercus mongolica (40.2%), respectively. Finally, The cluster D was dominated by P. densiflora (30.6%) and Q. mongolica (31.0%) with the mixed forest. 3) In the P. densiflora community (cluster A), distribution of DBH class showed a reverse J-shaped curve. In the L. leptolepis community (cluster B), individuals of dominant species had the bell-shaped distribution. Oak species indicated uniform distribution of DBH class (under 25 cm) in the mixed P. densiflora - Q. mongolica community (cluster D). 4) The species diversity index of the communities in descending order were: Pinus densiflora - Q. mongolica community > Larix leptolepis community > Pinus densiflora community > Quercus mongolica community.

• 전력전자학회논문지
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• 제22권4호
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• pp.353-359
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• 2017

To take advantage of electric propulsion, several large vessel kinds, namely, cruise vessels, icebreakers, drill ships, and warships, have been generally designed with Integrated Power System (IPS). Although most of these vessels have adopted AC distribution IPS, DC distribution IPS ships have recently emerged as a new promising technology thanks to the availability of the products related to the DC distribution system, in which the system's major advantages over AC distribution are reduced weight and fuel consumption. This paper presents the comparison results of a 10-t class fishing boat for the AC distribution and DC distribution cases. By replacing AC distribution system with DC distribution, 31-41% reduction in the weight of the electrical equipment weight and 20-25% reduction in the fuel consumption are expected.

• 대한치과기공학회지
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• 제29권2호
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• pp.197-211
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• 2007

With the development of orthodontics and increasing concerns on physical appearance, the number of patients has been steadily increasing. It is quite important not only to make effective cure plans and accurate diagnoses but also to have a thorough grasp of patients' malocclusion types and their occurrence frequency, in addition to patients' personality in order to cure the patients appropriately. This study is based on 946 malocclusion patients who had visited Chong-A Dental Hospital from 1999 to 2004 and investigated their aspects of malocclusion and characteristics of their gender, age and residence. The results are as follows. 1. The number of patients per year had been decreased until 2001, after which year the number had fluctuated. The number was the largest in 1999, 169 and the smallest in 2001, 140. Female occupied 68.0% of the total, twice as many as male, 32.0%) 2. Based on the Angle's classification, 19 or over year - old group was the largest of the total, 59.3% and 6 or younger year - old group, the smallest, 0.5%. The 19 or over year old group was less than a half of the total (47.4%) in 2003 and there were no patients who belonged to the 6 or younger year - old group in 2003 and 2004. 3. Distributions on the types of malocclusion have shown that 39.9 % of the total are in the Class I, the largest, 31.0% in the Class I and 29.2 in the Class II, the smallest. 1) The number of the ClassI was 73, the largest, that of the Class III being 35, the smallest in 1999. On the whole, the number of the Class I accounted for the largest part of the total. 2) The number of male patients in the Class II was the smallest, generally being the largest in the Class I. In case of female, that of the Class III was the smallest. 3) Based on the age, the Class I was the highest in between 7 and 13 age group, the Class III the lowest. The Class I occupied the largest around 40%. 4) In the shape of physiognomy, the meso occupied the largest part among all the Class, of which the Class II was the highest, 64.2%. The bracy was the largest in the Class I, and the dolicho in the Class III. 5) In the profile, the convex shape was the largest in the Class I and II, and especially in the Class II, over 3/4 of the total, 75.4%. In contrast, the direct shape was the largest in the Class III and the sunken shape occupied 33.3%, which was nearly ten times more than the case of the Class I and III. 6) In the asymmetry of physiognomy, the number of patients of the Class IIIwas the largest, 34.1% and that of the Class II, the smallest, 19.5%. It was found that about one fourth of the malocclusion patients were under the asymmetry of physiognomy. 4. In the distribution of patients' residence, 81.4% were from the Seoul Metropolis and 48.2% from Gangnam-Gu where Chong-A Dental Hospital is located and Seocho-Gu and Songpa-Gu which are adjacent to Gangnam-Gu.

• 한국잠사곤충학회지
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• 11호
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• pp.81-86
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• 1970

본 연구는 재조검사의 비교연구에 관한 것으로 우리나라의 실험성적 (1668.9∼ll)과 개정법 실시 이전에 조사된 일본의 실험성적(1968.6)을 비교 검토한 결과 다음과 같은 결론을 얻었다. (1) 우리나라 생사는(21D.춘) 현행법에서 평균절단수 5.91회인 것이 개정법에서는 8.6회로 평균 2.7회가 증가되었다. 일본생사는 (21D.) 현행법에서 평균절단수 3.6회 인 것이 개정법에서는 4.7회로 평균 1.1회가 증가되었다. (Table 1,2 참조) (2) 절단회수별 하구수분포는 우리나라의 경우 현행법에서 절반수가 3,4 및 5회의 것이 가장 많았고(48％) 개정법에서는 5,6 및 7회의 것이 많았으며 (36％) 평균절단수증가 만큼의 (2.7회) 차와 같은 경향의 분포를 나타내었다. 일본의 경우에도 현행법에 있어서는 절단수 1.2 및 3회의 것이 가장 많았고 (55％) 재정법에서는 2.3및 4회의 것이 많았으며 (50％) 평균절단수 증가만큼의 (1.1과) 차와 같은 경향의 분포를 나타내었다. (Table 1.2참조) (3) 겉타래의 예비재조시간의 절단수 분포를 보면 우리나라와 일본이 다같이 평균절단수를 중심으로 분포되어 있으나 무절단 비율은 우리나라의 7％에 비해 일본은 43％로 월등히 많았다. (Table 3 참조) (4)표 2.3및 4의 성적을 현행 및 개정격부법에 준해 비교검토하면 우리나라 생사는 현행격부법에 준한 경우 1계급(6회) 이 68％, 2계급(10회)이 22％, 그러고 3계급(4회)이 13％ 밖에 안되며 2계급(10회)이 56％ 3계급(18회)이 29％로 약 55％가 1계급에서 2계급으로 하락하였으며 2계급에서 3제급으로 약 20％가 하락하는 경향을 보였다. 이에 대해 일본 생사는 현행격부법에 준한 경우 1계급(6회)이 85％, 2계급(10회)이 10％ 그리고 3계급(13회)이 5％이었으며 개정격부법에서는 1계급이 60％ 2계급이 33％ 그리고 3계급이 7％로 우리나라 생사에 비해 소수의 것만이 1계급에서 2계급으로 하락하였을 뿐 출현도에 별차가 없었다. (Table 6 참조) (5) 재정격부법중 재조의 계급구분을 1계급의 것을 6회에서 4회로 특히 강화 하였는데 이것은 오직 일본 생사의 평균제조 절단수 만을 (4회 ;1969) 참작한 일본생사 위주로 작성된 것이라 생각한다. 그것은 생사생산국간의 재조검사 성적을 보아도 한국은 일본의 다음이며 그외 품질의 우수함도 널리 알려져 있기 때문이다. (6) 이상의 여러가지를 비교 검토할 때 현행법에서 평균절단수 5회 정도인 우리나라 생사는 재정법을 적용하는 경우 8∼9회를 쉽게 예상할 수 있는 것이며 생사수요자들이 중요시하는 재조성적으로 인한 격 하락의 수가 증가하리라 생각한다.

• 대한수학회지
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• 제35권1호
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• pp.207-224
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• 1998

After the review of known results on the connections between selfsimilar processes with independent increments (processes of class L) and selfdecomposable distributions and between semi-selfsimilar processes with independent increments and semi-selfdecomposable distributions, dichotomy of those processes into transient and recurrent is discussed. Due to the lack of stationarity of the increments, transience and recurrence are not expressed by finiteness and infiniteness of mean sojourn times on bound sets. Comparison in transience-recurrence of the Levy process and the process of class L associated with a common distribution of class L is made.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.2118-2119
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• 2008

The paper introduces a new Distribution Class ground lead disconnector design that not only extends the claimable detonation range well below the 20 amps specified in industry standards, but is very durable when exposed to severe arrester durability tests. Finally, this paper shows how this next generation disconnector interacts with the connected arrester to improve the overvoltage withstand capability of the arrester assembly.