• 정보처리학회논문지C
• /
• 제9C권2호
• /
• pp.163-172
• /
• 2002

자바카드 API는 한정된 메모리를 가진 스마트 카드 기반의 프로그램을 개발할 때 많은 이점을 제공한다. 그러나 공개키 암호 알고리즘 구현에 반드시 필요한 연산들인 모듈러 지수 연산, 최대공약수 계산, 그리고 소수 판정과 생성 등의 연산을 지원하지 않는다. 본 논문에서는 자바 카드에서 공개키 암호 알고리즘 구현을 위해서 반드시 필요한 연산들을 지원하는 임의의 정수 클래스의 설계 및 구현하였다.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
• /
• pp.47-49
• /
• 2003

Automatic land use and land cover change (LUCC) detection via remotely sensed imagery has a wide application in the area of LUCC research, nature resource and environment monitoring and protection. Under the condition that one time (T1) data is existed land use and land cover maps, and another time (T2) data is remotely sensed imagery, how to detect change automatically is still an unresolved issue. This paper developed a land use and land cover class knowledge guided method for automatic change detection under this situation. Firstly, the land use and land cover map in T1 and remote sensing images in T2 were registered and superimposed precisely. Secondly, the remotely sensed knowledge database of all land use and land cover classes was constructed based on the unchanged parcels in T1 map. Thirdly, guided by T1 land use and land cover map, feature statistics for each parcel or pixel in RS images were extracted. Finally, land use and land cover changes were found and the change class was recognized through the automatic matching between the knowledge database of remote sensing information of land use & land cover classes and the extracted statistics in that parcel or pixel. Experimental results and some actual applications show the efficiency of this method.

• Journal of Forest and Environmental Science
• /
• 제27권2호
• /
• pp.113-118
• /
• 2011

This study was carried out to analyze annual diameter growth characteristics for major 11 tree species using the data for Gangwon province of the National Forest Resources Inventory in 2007. The annual diameter growth of coniferous species was 5.02 mm, 4.70 mm, and 3.90 mm in Korean white pine, Japanese larch, and Korean red pine, respectively. In growths of the deciduous trees, dogwood, basswood, and cork oak had 3.55 mm, 3.48 mm and 3.01 mm, respectively. Average of the annual diameter growths for all species was 3.38 mm. The relationship between diameter growth and age class showed that the growth rate decreased for all species as age increased. The age class II had the highest annual diameter rate. In relation of the stand density(trees per hectare) and diameter growth, the diameter growth tended to decrease as the stand density increased for most species, especially Korean white pine, cork oak, and basswood. Finally age had the highest value in the correlation coefficients between measurement factor and growth rate regardless of species.

• 아태비즈니스연구
• /
• 제11권3호
• /
• pp.261-271
• /
• 2020

Purpose - This study was to establish a unified tourism management class for university students based on Gangwon-do. Community based learning(CBL) was applied to provide a tangible and intangible resource of tourism resources the theoretical approaches and the actual experiences of the community. Design/methodology/approach - In order to design a unified tourism management module, this study applied qualitative research and quantitative research methods to collect information on the direction of the module. the study conducted in-depth interviews and then an online survey. Findings - According to the results of the study, the main parts should include necessity of unification, inter-Korean tourism, inter-Korean cooperation, inter-Korean economy, and international relations. Research implications or Originality - The overall composition of the unification tourism management class should be designed as the unification tourism management theory to acquire the subject knowledge, the field trip to the border area for experiential learning, and the assignment of the field study task to understand the community.

• Educational Technology International
• /
• 제8권1호
• /
• pp.101-126
• /
• 2007

The purpose of this study was to investigate current practices in blended instruction. In particular, the study explored (1) the types of instructional delivery methods, technologies, and instructional components, (2) the reasons why faculty apply blend instruction, and (3) the advantages and challenges in delivering blended instruction. This study focused on the practices in the Universities that have the extensive doctoral research programs classified by the Carnegie Foundations. The survey was performed with the sample of faculty from 30 universities and the survey data included 133 faculties out of the total 1,000 randomly selected faculty members. Of the 133 responses, 111 (77.7%) participants had certain degree of experience, while 17 faculty (or instructors) (13.3%) did not have any practice with blended instruction. The most common instructional delivery format in the participating universities was blended instruction that added supplementary online instructional components in the class. Online Course Management Systems (CMS) and multimedia presentation tools were common technology for course delivery, and "discussion" was the most general instructional activity for the class. The participating faculty often preferred the blended format since it provides students and faculty with convenience, flexibility, active engagement, efficiency in using resource materials, and a feeling of connection between/among students and instructor. Benefits to the class were availability of more authentic experience and diverse curricular materials, and the instructional format that meets the needs of remediation and enhancement of students. This study addressed not only advantages and challenges of blended instruction, but also suggestions based on the comments by the participating faculty.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2002년도 하계종합학술대회 논문집(1)
• /
• pp.45-48
• /
• 2002

This paper presents a QoS-guaranteed traffic control system which supports QoS of realtime packet transmission for the multimedia communication. The traffic control system presented in this paper applies the integrated service model and provides QoS o(packet transmission by means of determining the packet transmission rate with the policy of network manager and the optimal resource allocation according to the end-to-end traffic load. It also provides QoS for the realtime packet transmission through the AWF2Q+ Scheduling algorithm and per-class queuing method.

• 한국환경복원기술학회지
• /
• 제16권1호
• /
• pp.227-244
• /
• 2013

The vascular plants in the trail from Jangansan to Palgongsan were listed 389 taxa (8.0% of all 4,881 taxa of Korean vascular plants); 84 families, 226 genera, 325 species, 1 subspecies, 55 varieties and 8 forms. Furthermore, hemicryptophytes (H) were 110 taxa (28.3%), geophytes (G) were 77 taxa (19.8%), megaphanerophytes (MM) were 48 taxa (12.3%), nanophanerophytes (N) were 47 taxa (12.1%) showed high proportional ratio in life form. So, resource plants of 237 taxa of edible (60.9%), 278 taxa of medicinal (71.5%), 229 taxa of ornamental (58.9%) and 178 taxa of the others (45.8%). Based on the list of rare plants, 7 taxa (1.8% of all 389 taxa of flora and 1.2% of all 571 taxa of rare plants); Paeonia japonica (VU), Viola albida, Viola diamantica, Lilium distichum, Disporum ovale, Tricyrtis dilatata, Iris ensata var. spontanea (LC), etc. Based on the list of endemic plants, 7 taxa (1.8% of all 389 taxa of flora and 2.1% of all 328 taxa of endemic plants); Salix koriyanagi, Aconitum pseudolaeve var. erectum, Thalictrum actaefolium var. brevistylum, Philadelphus schrenckii, Asperula lasiantha, Weigela subsessilis, Carex okamotoi, etc. Based on the list of specific plants, 46 taxa (11.8% of all 389 taxa of flora and 4.3% of all 1,071 taxa of specific plants); 2 taxa (Wisteria floribunda for. floribunda, Cardamine yezoensis, etc.) in class IV, 6 taxa (Acer palmatum, Ulmus davidiana, etc.) in class III, 14 taxa (Ligularia fischeri, Cymopterus melanotilingia, etc.) in class II, 24 taxa (Ilex macropoda, Fraxinus mandshurica, etc.) in class I. Based on the list of naturalized plants, 6 families, 16 genera, 18 taxa (Phytolacca americana, Robinia pseudoacacia, Oenothera odorata, Erechtites hieracifolia, Festuca arundinacea, etc.) and invasive alien plants were 3 taxa; Rumex acetocella, Ambrosia artemisiifolia, Aster pilosus. Naturalization rate (NR) was 4.6% of all 389 taxa of vascular plants and urbanization index (UI) was 5.6% of all 321 taxa of naturalized plants.

• 한국통신학회논문지
• /
• 제42권3호
• /
• pp.554-561
• /
• 2017

IoT(Internet of Things) 응용 디바이스는 실내, 지하 등의 신호가 도달하기 어려운 환경에 있는 경우가 많을 뿐만 아니라 송신 출력도 낮으므로 기지국이 낮은 수신 감도에서도 수신이 가능하도록 설계되어야 한다. 이를 위해 채널 상태가 좋지 않은 디바이스는 낮은 부호화율이나 반복전송 등을 이용하여 낮은 데이터 전송률로 전송할 수 있다. 채널 상태에 따라 커버리지 클래스를 나누고 채널 상태에 맞는 전송 속도를 사용할 때 커버리지 클래스마다 패킷의 길이가 다를 수 있으며 슬롯 알로하 랜덤 접속의 성능이 떨어질 수 있다. 특히 서로 다른 커버리지 클래스의 디바이스들이 공유된 자원을 사용할 때는 채널 상태가 나쁜 디바이스의 성능이 떨어질 수 있으며, 반대로 커버리지 클래스마다 분리된 자원을 사용할 때는 한 자원 영역에 랜덤 액세스를 하는 디바이스가 많아지는 혼잡이 발생할 수 있다는 문제가 있다. 본 논문에서는 이를 보완할 수 있는 방법들을 제안한다. 이 연구는 MTC 디바이스를 중심으로 연구하였으며, 추후 발전 가능성이 높은 부분이라 생각된다.

• 가족자원경영과 정책
• /
• 제17권4호
• /
• pp.189-213
• /
• 2013

The purpose of this work is to explore different types of intergenerational relationships in the later lives of old retirees. This will be done according to the eligibility of public pension and the old age social security system so that the factors affecting intergenerational relationships can be analyzed, and to propose a plan to improve social adaptation in later life. The data used in this work are the Fourth basic survey data of the 2011 Korea Retirement and Income Study. The study subjects of this work were 2,435 retirees over age 65 who had children. In this study, latent class analysis and logistic regression analysis were conducted to classify types of intergenerational relationships and to analyze the influence of relevant factors. As a result of the analysis, some of those in the group were eligible for public pension, and the ones who were not were classified into three types: the closely-living-together type, the separate-living-contact type, and the estrangement type. In the group not eligible for public pension, it was found that age, spouse, number of children, economic factors, and level of health satisfaction gave significant power to intergenerational relationships. In the group eligible for public pension, it was found that age, income and net assets, ADL(Activities of Daily Living), whether there was an IADL(Instrumental Activities of Daily Living) spouse, and number of children affected types of intergenerational relationships; Socio-demographic factors, economic factors, and healthy factors became significant variables according to the classified types of intergenerational relationship. Based on the study results, this work suggested such necessities to lay the foundation for an elderly welfare system for social adaptation in later life, This includes the offering of programs for retirement preparation, the use of family and local society resources, and expansion of the opportunity to participate in social activities.

• 자원ㆍ환경경제연구
• /
• 제27권4호
• /
• pp.695-723
• /
• 2018

최근 들어 기후변화로 인한 이상기후가 빈발해지고, 미세먼지 문제가 심각해짐에 따라 석탄화력발전에 대한 부정적인 인식이 커지고 있고, 경주 지진 이후 원자력 발전에 대한 사회적 수용력도 감소하고 있다. 본 연구는 선택실험법을 이용하여 중장기 전원별 일반 소비자들의 지불용의액을 도출함으로써 각 발전원에 대한 경제적 가치를 추정하고, 소비자들의 선호 이질성을 검토하였다. 적용한 방법론은 혼합로짓과 잠재계층모형이며, 혼합로짓 추정결과 특히 원자력에서 선호이질성이 크게 나타나는 것을 확인하였다. 잠재계층모형 추정결과 집단1은 신재생에너지를 선호하며, 집단2는 기존의 화석에너지를 선호하였다. 집단3은 사전편찬식 선호(제한적 합리성)을 보이는 집단으로 추정되었다. 사전편찬식 선호를 보이는 집단을 고려하지 않을 경우 지불용의액 추정의 신뢰성이 낮아지고, 속성의 유의성이 낮아지는 결과가 나타나는 것을 확인하였다. 또한 집단별로 에너지원에 대한 선호 이질성이 크게 나타나, 향후 전원구성에 있어 전력 소비자의 선호 이질성을 감안한 정책이 필요할 것이다.