• 화약ㆍ발파
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• 제37권2호
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• pp.14-21
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• 2019

개별요소법은 절리가 발달한 불연속 암반의 모델링에 매우 유력한 수치해석적 방법이다. 또한 발파 후 큰 변위가 일어나는 단계에서의 모델링에도 효과적이다. 개별요소법에서 각 요소는 강체로 가정하고, 요소 간 약간의 중첩을 허용하여 접촉 변위로부터 상호 작용력을 계산한다. 개별요소의 경계로 정의되는 절리의 강성은 블록요소 상호 간의 거동을 결정하는 중요한 변수로서 변형의 크기와 파괴 양상에 영향을 준다. 그러나 요소 간 과도한 중첩으로 인한 수치해석적 불안정성을 방지하기 위해서 어떤 준정적인 문제에 있어서는 실제 절리 물성과 관계없이 임의로 선정된 절리 강성 값이 사용되기도 한다. 해석의 주된 관심사가 정밀도 높은 변형의 크기 예측이냐, 불연속체의 파괴 양상이나 파괴 후 파괴된 블록들의 거동 예측이냐에 따라, 절리 강성에 대한 입력 자료 값은 결과에 큰 영향을 주지 않을 수도 있고, 심각한 예측 오류를 가져올 수도 있다. 본 연구는 개별요소법을 이용한 수치해석 모델링에서 절리 강성 값이 해석 결과에 미치는 영향을 이해하고 입력자료 선정 지침에 도움을 주고자 수행되었다.

• 농업생명과학연구
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• 제53권2호
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• pp.65-75
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• 2019

Stem and root of elm trees have used as traditional medical materials, but there is little information on the distribution and resources of habitats. Korean native growing Ulmus spp. (U. davidiana var. Japonica, U. parvifolia, U. davidiana, and U. macrocarpa) genetic resources studied through The National Forest Inventory of Korea data and field survey. The distributions of U. davidiana var. japonica according to elevation distributed evenly. Both U. parvifolia and U. davidiana were inhabited mostly at less than 200 m of altitude. Each Ulmaceae species widely were distributed nationwide, but a dominant species was different depending on locals. It observed that Ulmaceae inhabits mainly in steep slopes of 31-45 degrees. Most of the habitats regenerated by natural seeding and the most abundant species were a codominant tree. Distribution of trees in U davidiana var. japonica was 7 m-13 m, and in young U. parvifolia and U. macrocarpa, more than 25% of young trees less than 7 m observed. The distribution of the diameter of breast height of the U. davidiana var. japonica was 46.4% for 11-20 cm, 52.6% for 11-20 cm in U. parvifolia. The average T/R ratio was 0.83, and the mean weight ratio of root bark was 62%. As the results of this study, the domestic Ulmaceae biomassare very small. It is difficult to harvest in that the habitat on the slope. Thus, it is too hard to develop functional materials using biomass at present. Therefore, it is necessary to develop technology for the selection and propagation of elite trees of Ulmaceae.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2008년도 추계학술발표대회
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• pp.1332-1335
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• 2008

In order to various service types of real time and non-real time traffic with varying requirements are transmitted over the IEEE 802.16 standard is expected to provide quality of service(QoS) researchers have explored to provide a queue management scheme with differentiated loss guarantees for the future Internet. The sides of a packet drop rate, an each class to differential drop probability on achieving a low delay and high traffic intensity. Improved a queue management scheme to be enhanced to offer a drop probability is desired necessarily. This paper considers multiple random early detection with differential drop probability which is a slightly modified version of the Multiple-RED(Random Early Detection) model, to get the performance of the best suited, we analyzes its main control parameters (max_th, min_th, max_p) for achieving the proportional loss differentiation (PLD) model, and gives their setting guidance from the analytic approach. we propose Dynamic-multiple queue management scheme based on differential drop probability, called Dynamic-VQSDDP(Variable Queue State Differential Drop Probability)T, is proposed to overcome M-RED's shortcoming as well as supports static max_p parameter setting values for relative and each class proportional loss differentiation. M-RED is static according to the situation of the network traffic, Network environment is very dynamic situation. Therefore max_p parameter values needs to modify too to the constantly and dynamic. The verification of the guidance is shown with figuring out loss probability using a proposed algorithm under dynamic offered load and is also selection problem of optimal values of parameters for high traffic intensity and show that Dynamic-VQSDDP has the better performance in terms of packet drop rate. We also demonstrated using an ns-2 network simulation.

• 지능정보연구
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• 제25권4호
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• pp.105-122
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• 2019

텍스트 데이터가 특정 범주에 속하는지 판별하는 문장 분류에서, 문장의 특징을 어떻게 표현하고 어떤 특징을 선택할 것인가는 분류기의 성능에 많은 영향을 미친다. 특징 선택의 목적은 차원을 축소하여도 데이터를 잘 설명할 수 있는 방안을 찾아내는 것이다. 다양한 방법이 제시되어 왔으며 Fisher Score나 정보 이득(Information Gain) 알고리즘 등을 통해 특징을 선택 하거나 문맥의 의미와 통사론적 정보를 가지는 Word2Vec 모델로 학습된 단어들을 벡터로 표현하여 차원을 축소하는 방안이 활발하게 연구되었다. 사전에 정의된 단어의 긍정 및 부정 점수에 따라 단어의 임베딩을 수정하는 방법 또한 시도하였다. 본 연구는 문장 분류 문제에 대해 선택적 단어 제거를 수행하고 임베딩을 적용하여 문장 분류 정확도를 향상시키는 방안을 제안한다. 텍스트 데이터에서 정보 이득 값이 낮은 단어들을 제거하고 단어 임베딩을 적용하는 방식과, 정보이득 값이 낮은 단어와 코사인 유사도가 높은 주변 단어를 추가로 선택하여 텍스트 데이터에서 제거하고 단어 임베딩을 재구성하는 방식이다. 본 연구에서 제안하는 방안을 수행함에 있어 데이터는 Amazon.com의 'Kindle' 제품에 대한 고객리뷰, IMDB의 영화리뷰, Yelp의 사용자 리뷰를 사용하였다. Amazon.com의 리뷰 데이터는 유용한 득표수가 5개 이상을 만족하고, 전체 득표 중 유용한 득표의 비율이 70% 이상인 리뷰에 대해 유용한 리뷰라고 판단하였다. Yelp의 경우는 유용한 득표수가 5개 이상인 리뷰 약 75만개 중 10만개를 무작위 추출하였다. 학습에 사용한 딥러닝 모델은 CNN, Attention-Based Bidirectional LSTM을 사용하였고, 단어 임베딩은 Word2Vec과 GloVe를 사용하였다. 단어 제거를 수행하지 않고 Word2Vec 및 GloVe 임베딩을 적용한 경우와 본 연구에서 제안하는 선택적으로 단어 제거를 수행하고 Word2Vec 임베딩을 적용한 경우를 비교하여 통계적 유의성을 검정하였다.

• 벤처창업연구
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• 제9권5호
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• pp.83-94
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• 2014

본 연구는 최근 들어 가속화되고 있는 글로벌화와 인소싱(Insourcing)에 주력 기업들이 조직의 핵심역량강화를 목표로 도입하고 있는 아웃소싱(Outsourcing)을 분석하는데 목적이 있다. 특히 국내기업의 경우 자원의 해외조달, 높은 인건비의 상승, 부동산 가격의 급증 등 경영환경 변화에 대한 능동적 대처와 유력한 분야나 핵심역량에 자원을 집중시키기 위하여 아웃소싱을 실시하고 있다. 아웃소싱은 기업이 당면한 문제를 효율적으로 처리할 수 있고 핵심역량 이 외의 분야를 위탁 처리할 수 있어 기업의 경쟁력 확대가 가능하다. 이러한 변화 속에서 아웃소싱은 전문성을 확보할 수 있으며 고객의 니즈(Needs)를 충족할 수 있는 방법의 하나로 효율성과 경쟁력 확보 수단으로 활용되고 있다. 최근에는 대기업뿐 만아니라 중소기업 및 정부에서도 시장의 경쟁력 확보 수단으로 활용범위가 넓어지고 있다. 이와 같은 아웃소싱 시장의 흐름은 선진국에서부터 시작되었으나, 우리나라와 경영환경이 비슷한 일본의 경우 글로벌 아웃소싱의 시장규모가 급속하게 성장하고 있는 추세에 있다. 이에 본 연구는 기업의 경쟁력 강화를 위하여 추구하고 있는 경영형태인 아웃소싱에 대하여 아웃소싱을 운영하고 있는 업체를 주 대상으로 아웃소싱이 기업성과에 미치는 영향에 대하여 실증 분석함으로써 시사점을 제시하고자 한다.

• 한국학교보건학회지
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• 제12권2호
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• pp.207-215
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• 1999

The objectives of this study are to explain the use of media materials in school health education with other related factors in elementary, middle, and high schools in Korea. The data were collected by questionnaires from June to September in 1998. The number of subjects were 294 school nurses. The PC-SAS program was used for statistical analysis such as percent distribution, chi-squared test, spearman correlation test, and logistic regression. The use of media materials in health education has become extremely common. Unfortunately, much of the early materials were of poor production quality, reflected low levels of interest, and generally did little to enhance health education programming. A recent trend in media materials is a move away from the fact filled production to a more affective, process-oriented approach. There is an obvious need for health educators to use high-quality, polished productions in order to counteract the same levels of quality used by commercial agencies that often promote "unhealthy" lifestyles. Health educators need to be aware of the advantages and disadvantages of the various forms of media. Selecting media materials should be based on more than cost, availability, and personal preference. Selection should be based on the goal of achieving behavioral objectives formulated before the review process begins. The decision to use no media materials rather than something of dubious quality usually be the right decision. Poor-quality, outdated, or boring materials will usually have a detrimental effect on the presentation. Media materials should be viewed as vehicles to enhance learning, not products that will stand in isolation. Process of materials is an essential part of the educational process. The major results were as follows : 1. The elementary schools used the materials more frequently. But the production rate of media materials was not enough. The budget was too small for a wide use of media materials in school health education. These findings suggest that all schools have to increase the budget of health education programs. 2. Computers offer an incredibly diverse set of possibilities for use in health education, ranging from complicated statistical analysis to elementary-school-level health education games. But the use rate of this material was not high. The development of related software is essential. Health educators would be well advised to develop a basic operating knowledge of media equipment. 3. In this study, the most effective materials were films in elementary school and videotapes in middle and high school. Film tends to be a more emotive medium than videotape. The difficulties of media selection involved the small amount of extant educational materials. Media selection is a multifaceted process and should be based on a combination of sound principles. 4. The review of material use following student levels showed that the more the contents were various, the more the use rate was high. 5. Health education videotapes and overhead projectors proved the most plentiful and widest media tools. The information depicted was more likely to be current. As a means to display both text and graphic information, this instructional medium has proven to be both effective and enduring. 6. An analysis of how effective the quality of school nurse and school use of media materials shows a result that is not complete (p=0.1113). But, the budget of health education is a significant variable. The increase of the budget therefore is essential to effective use of media materials. From these results it is recommended that various media materials be developed and be wide used.

• 기록학연구
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• 제6호
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• pp.225-262
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• 2002

Chief Consultant Archives Government Archives & Records Service -table of contents- 1. Introduction 2. Relationship of Historical Studies and Archive 3. Relationship of Archives and Archives 4. Conclusion; Historians, Archives, and Archivists, and Their Roles This essay is mainly written for historians who may have "little or limited experience" in dealing with archives and archivists in their course of historical research. It may sound very ridiculous to say that "historians have little or limited experience" in using archives but it is also true that many Korean historians have depended on various compiled editions of historical materials or personally donated and/or collected materials when they do research, rather than they would visit archives and search for the materials by themselves. This is the main reason for that the public archives in Korea have not served historians well and effectively, and vice versa, that historians have not visited archives sometime with no knowledge of archives, and have not requested opening of archives for their research. It is a simple fact that historian's study depends on the records he/she uses. Without records, there should be no history. Use of archives for historical research is a common thing and a must in modern archives. Records are selected to be preserved in archives for their preservation as well as their future use. Who select the records as archives? Archivists do mostly. Then, what are the criteria for the archivists to chose records as permanent preservable archives? Answers to this fundamental question have been provided by many historians and archivists. The closest answer may be that selecting archivists would be better trained and equipped with historical research and knowledgeable of the major trends in historical research. With his/her own experience of historical research and tracing the trends of historical studies and materials used in the historiography, they could chose better and appropriate records for future use using their prudence and discretion. It also means that historians have had influence on archivists in their selecting archives by providing the theme and context of historical studies of the time. Though not necessarily becoming a historian themselves, selecting or appraising archivists should understand the process of creating the records and should know how they become archives. This is a precondition to become a good archivist. But that's not all. They must know how the archives are used and what archives are used for what purposes. Among many other roles of modern archivists, selecting and describing the archives are the foremost tasks of an archivist. Archivists therefore developed modern methods to select future archives based on functional analysis and records series concept rather than a record file or item as a unit of selection. Historians are users or consumers of the archives held in the archives building or repository. The quality of their study depends on the "quality" of the materials they use. With the help of archivists not to mention of reference service, historians owe much to archivists in having an access to the materials they need, intellectually and physically. Too many closed archives and too long closed archives in the archives repository would benefit neither historians nor archivists. However, archivists can mostly react only to archive requests and demands made by historians for more wide accessibility. Using the FOIA, as in the U.S., or the Information Opening Act, as in case of Korea, historians can promote the use of historical materials as well as promoting accountability and transparence for the benefit to society as whole. In this context, it is vary desirable to establish a close professional relationship between historians and archivists even in the age of information society. At present, historians need more understanding of operation and importance of archives while archives administration need to realize the potential archival demands from research community and civil movement for clean government.

• 한국양식학회지
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• 제2권2호
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• pp.91-106
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• 1989

해산어류 및 갑각류 유생 사육 시 초기 먹이로 요구되는 rotifer를 고온기나 저온기에 생산하고자 할 때 Chlorella 대용으로서 적합한 식물성 먹이생물에 관한 실험요약은 다음과 같다. 1. 고온에서 가장 성장이 양호한 종은 Nannnochioris oculata로 $28^{\circ}C$, $33\%_{\circ}$, 5,000 lux가 최적 환경 요인으로 밝혀졌다. 2. 저온에서 가장 성장이 양호한 종은 Phaeodactylum tricornutum이었고 이 종의 최대 성장요인은 보험구간중 가장 고온인 $10^{\circ}C$, 8,000 lux 및 $30\%_{\circ}$이었고 $8^{\circ}C$에서도 성장이 양호한 편이었다. 3. Nannnochioris oculata 와 Phaeodactylum tricornutum을 대조구인 Chlorella ellipsoidea와 함께 고온 및 저온에서 각각 대량배양하여 rotifer를 배양한 결과 rotifer 개체 밀도는 Nannnochioris oculata를 공급하여 배양한 것이 Chlorella ellipsoidea에 비해 월등히 높았고 Phaeodactylum tricornutum을 공급하여 배양한 경우는 Chlorella ellipsoidea보다 약간 낮은 것으로 나타났다. 지방산 조성에서도 Nannnochioris oculata가 Chlorella ellipsoidea나 Phaeodactylum tricornutum보다 polyene의 비가 높아 영양적인 측면에서도 유리한 것으로 확인되었다.

• 한국문헌정보학회지
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• 제52권3호
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• pp.247-271
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• 2018

본 연구는 도서관, 기록관, 박물관 등 전문적인 기관에서 기록물을 보존하고 관리하는 중앙 집중식 디지털 아카이브 구축방식과는 달리, 예산과 전문 인력이 부족한 민간 아카이브 또는 일반 개인의 디지털 아카이브 구축을 위한 공개 소프트웨어의 활용 가능성을 조사하고자 하였다. 이를 위해 공개 소프트웨어 세 가지 AtoM, ArchivesSpace, Omeka를 제안하고, 공개 소프트웨어에 대한 경험이 없는 구축자와 이용자를 대상으로 사용성 평가를 실시하였다. 평가결과, AtoM은 기록관리시스템과 서비스를 제공하기 위해 개발된 시스템으로 구축자와 이용자 모두 만족도가 높게 나타났으나, ArchivesSpace는 기록물 입력 필수 항목이 많고, 이미지 객체가 검색 화면에 제공되지 않는 등 구축자와 이용자 모두 불편하다고 응답하였다. Omeka는 아이템 레벨만 간단히 입력하여도 아카이브 구축이 가능하여 구축자 만족도는 높게 나타났으나, 검색 서비스를 고려하지 않은 전시 기능 중심 시스템으로 이용자 만족도는 낮게 나타났다. 이러한 평가 결과를 기반으로 소규모 기관이나 일반 개인이 공개 소프트웨어를 선정하고자 할 때 고려해야 하는 선정 기준을 목적, 라이선스, 구축 환경, 기능, 메타데이터, 상호운용성 등의 항목으로 제안하였다.

• 대한간호학회지
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• 제3권1호
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• pp.41-51
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• 1972

In this article, the writer attempted to study the followings: (1) mother's knowledge of milk feeding (including method of sterilization, formula and feeding) (2) reasons of artificial feeding (3) how much mothers are concerned about their artificial feeding infants (4) condition of growth and development of artificial feeding infants. As the object of study, 96 mothers with artificial feeding infants, who had consulted dep't of pediatrics of two Hospitals in Seoul (Korea Hospital and Med. College Woo Suk Hospital, Korea Uni.) and well baby clinic of the two Health Centers (Sung Dong and Dongdaemoon), were randomly sampled. The data were treated by the statistic method of chi-square and percentage, and come to the following conclusion. 1. Knowledge of milk feeding Sterilization: 70 percentages of mothers know about the milk sterilization (including bottle, nipple and instrument), but 55 percentages of them do not know the nipple sterilization correctly. Formula: 69 percentages of mothers follow the indicator or in accordance with doctor's directions, but 31 percentages do at their option by reasons that the baby often coughs up the milk, the baby is too small, the baby often has digestive troubles, or the baby grow fleshy heavily etc, except family economic problems. Feeding: only half of mothers know the correct feeding method, especially they do not know how to determine the heat degree of milk and how to bubble up the baby correctly. They just do feeding according to the accepted usages. 2. Reasons of artificial feeding Of the reasons of artificial feeding, 18 percentages were caused by infants and 82 percentages by mothers. Most of the reasons are mainly due to the lack of breast milk and sufficient supply of nourishments rather than mother's deficiency or mother's abnormality. 3. Mother's concern for artificial feeding infants Mothers who are sharply concerned for their artificial feeding baby's growth and development: 63%, mothers who made the baby (artificial feeding infant) routine vaccinated: 81%, mothers who ear anxious about the baby's future personality forming : 68%, mothers who care about the baby's condition of nourishment; 60%, mothers who are anxious about tile selection of baby's food; 54%. 4. The growth and development of artificial feeding infants compared with Korean average infants. The artificial feeding infants are above the Korean average infants in stature by 1.21 centimeters and in weight by 0.3 kilograms. Conclusion: It has been said that there is no better food for infant than the breast milk. However, the artificial feeding has been used for the supplement of nourishments and as substitute food for the breast milk. And this artificial feeding could give the married women the chance to act in society and more opportunity to develop themselves and to work for others at home and other fields. Considering these advantages, artificial feeding should not be exclusive, but preferably should be more improved and inquired positively. And even in artificial feeding, what is most important is that mothers should recognize the requirement and need of artificial feeding clearly and correctly, and they should be accustomed to the correct knowledge and skills of artificial feeding in order to practice it appropriately. In some degree, they should be properly trained in school education process.