• 센서학회지
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• 제22권1호
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• pp.18-27
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• 2013

Real-time monitoring is one of the prime necessities in a weapon flight test that is required for the efficient and timely collection of large amounts of high-rate sampled data acquired by an event-trigger. The wireless sensor network is a good candidate to resolve this requirement, especially considering the inhospitable environment of a weapon flight test. In this paper, we propose a priority based multi-channel MAC protocol with CSMA/CA over a single radio for a real-time monitoring of a weapon flight test. Multi-channel transmissions of nodes can improve the network performance in wireless sensor networks. Our proposed MAC protocol has two operation modes: Normal mode and Priority Mode. In the normal mode, the node exploits the normal CSMA/CA mechanism. In the priority mode, the node has one of three grades - Class A, B, and C. The node uses a different CSMA/CA mechanism according to its grade that is determined by a signal level. High grade nodes can exploit more channels and lower backoff exponents than low ones, which allow high grade nodes to obtain more transmission opportunities. In addition, it can guarantee successful transmission of important data generated by high grade nodes. Simulation results show that the proposed MAC exhibits excellent performance in an event-triggered real-time application.

• 대한간호학회지
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• 제32권6호
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• pp.803-811
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• 2002

This study was to identify priority areas of nursing research in Korea. Method: A data analysis was done for the PhD subjects (n=133) who responded at the national level two-rounds delphi survey. Subjects were asked to assign a score from 1 to 7 for 29 nursing research areas regarding 3 aspects: the degree of nurses research leadership; the degree of contribution to nursing professions; and the degree of contribution to health and welfare of patients/clients. Result: For the overall three aspects, research area on clinical nursing practice was identified as the first priority, followed by nursing education, home health nursing, nursing research, and chronic disease. For nursing research leadership, research area on clinical nursing practice, nursing education, home health nursing, nursing research, and nursing diagnosis were identified. Concerning contribution to the nursing profession, the first priority was nursing education, followed by clinical nursing practice, nursing research, nursing policy, and home health nursing. Concerning contribution to the health/welfare of patients, clinical nursing practice, home health care, geriatric nursing, chronic disease, and symptom management were ranked as top 5 research priorities. Conclusion: The findings of this national survey will assist in building insights into the research needs of nurses practicing in Korea.

• 한국콘텐츠학회논문지
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• 제7권12호
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• pp.238-244
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• 2007

최근 ATM 포럼에서 승인한 GFR(Guaranteed Frame Rate) 서비스는 ATM 망에서 TCP/IP 트래픽을 효율적으로 서비스하는 중요한 서비스가 될 것으로 기대된다. GFR 서비스는 프레임 단계에서 최소 대역 서비스를 보장할 뿐 아니라 가용 대역을 공평하게 사용하도록 지원한다. 본 논문에서는 GFR 서비스를 위한 새로운 셀 스케쥴링 알고리즘을 제안한다. 제안된 알고리즘은 VC에 우선순위를 제공하고 버퍼에 있는 좀더 서비스를 받지 못한 셀에 좀더 높은 우선순위를 부여한다. 높은 우선순위의 VC들은 낮은 우선순위의 VC들 보다 더 많은 서비스를 받는다. 제안된 알고리즘은 GFR VC에 MCR 보장과 공평 대역 공유를 제공할 수 있다. 시뮬레이션 결과는 제안된 셀 스케줄링 알고리즘이 TCP 출력과 공평성 면에서 기존의 알고리즘 보다 우수한 성능을 제공함을 보여주고 있다.

• 대한전자공학회논문지
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• 제26권12호
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• pp.1947-1955
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• 1989

With the increasing complexity of cabling at sensory level in process control and manufacturing automation, field buses were introduced to replace the traditional point to point links from each sensor or acruator to its controlling equipments by a single link on which all information is transmitted seriall and multiplexed in time. In this papr, we introduce the BITBUS network as a field bus. For the service discipline of the BITBUS network, two service strategies are proposed to obtain the performance of the network. They are the equal priority cyclic service strategy and the non-equal priority cyclic service strategy. The former assigns equal priority to each node for polling and the latter assumes non-equal priority. The BITBUS network was modeled as a cyclic queueing model and it is analyzed by two methods: the Kuehn's and the Boxma's. Computer simulation was also done for the cyclic queueing model and simulation results were compared with those. Under mathematically non-analyzable environment, only the computer simulation was done. From the simulation result, in order to meet the response time requirement of 5 msec imposed by International Electrotechnical Commission when each node has the average traffic of 5000 messages/sec in manufacturing automation the number of slave nodes should be smaller than 10 at the transmission rate of 2.5 Mbps.

• 인터넷정보학회논문지
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• 제24권5호
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• pp.97-106
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• 2023

Citizens' demand for public CCTVs continues to rise, along with an increase in variouscrimes and social problems in cities. In line with the needs of citizens, the Seoul Metropolitan Government began installing CCTV cameras in 2010, and the number of new installations has increased by over 10% each year. As the large surveillance system represents a substantial budget item for the city, decision-making on location selection should be guided by reasonable standards. The purpose of this study is to improve the existing related models(such as public CCTV priority location analysis manuals) to establish the methodology foranalyzing priority regions ofSeoul-type public CCTVs and propose new mid- to long-term installation goals. Additionally, using the improved methodology, we determine the CCTV priority status of 25 autonomous districts across Seoul and calculate the goals. Through its results, this study suggests improvements to existing models by addressing their limitations, such as the sustainability of input data, the conversion of existing general-purpose models to urban models, and the expansion of basic local government-level models to metropolitan government levels. The results can also be applied to other metropolitan areas and are used by the Seoul Metropolitan Government in its CCTV operation policy

• Environmental Analysis Health and Toxicology
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• 제25권1호
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• pp.41-55
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• 2010

The aims of this study were to develop the suitable "system software" in chemical ranking and scoring (CRS) for the food hazardous chemicals associated with environmental emission and to suggest the priority lists of food contamination by environmental-origined pollutants. Study materials were selected with reference to the priority pollutants list for environment and food management from domestic and foreign research and the number of study materials is 103 pollutants (18 heavy metals, 10 PBTs, 10 EDs, and 65 organic compounds). The Food-CRS-Korea system consisted of the environmental fate model via multimedia, transfer environment to food model, and health risk assessment by contaminated food intake. We have established that health risks of excess cancer risks, hazard quotients (HQs) by chronic toxicity and HQs by reproductive toxicity convert to score, respectively. The creditable scoring system was designed to consider uncertainty of quantitative risk assessment based on VOI (Value-Of-Information). The predictability of the Food-CRS-Korea model was evaluated by comparing the presumable values and the measured ones of the environmental media and foodstuffs. The priority lists based on emissions with background-level-correction are 15 pollutants such as arsenic, cadmium, and etc. The priority lists based on environmental monitoring date are 17 pollutants including DEHP, TCDD, and so on. Consequently, we suggested the priority lists of 13 pollutants by considering the several emission and exposure scenarios. According to the Food-CRS-Korea system, arsenics, cadmium, chromes, DEHP, leads, and nickels have high health risk rates and reliable grades.

• 한국철도학회논문집
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• 제12권6호
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• pp.921-926
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• 2009

신뢰도 기반 유지보수의 연구가 진행됨에 따라 설비의 신뢰도를 바탕으로 한 효율적인 유지보수 업무가 가능하게 되었다. Risk Priority Number(RPN)는 시스템을 구성하고 있는 설비에 대한 Severity(S), Occurrence(O), Detection(D)을 각각 평가하고 이를 하나의 통합된 수치로 표현함으로써 설비간의 유지보수 우선순위에 관한 정보를 제공한다. 하지만 철도 전력 설비와 같이 통계적인 고장 데이터가 부족하거나 신뢰성이 떨어지는 경우에는 이들의 평가가 객관적으로 이루어지기 어렵다. 따라서 본 논문에서는 설비의 Occurrence를 평가하기 위해 퍼지 이론을 이용한 고장률 가공 방법을 제시하고, 객관적인 Severity와 Detection 평가를 이용하여 Risk Priority Number를 계산하는 새로운 방법을 제시하였으며, 이를 철도 변전소 모의 시스템에 적용시켜 보았다.

• 한국조경학회지
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• 제29권1호
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• pp.80-91
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• 2001

The purpose of this research is to provide a basic knowledge to open up for undeveloped park in process of the park policy establishment by setting up the priority of park development and valuation factor, valuation index as well as building a basic material to undeveloped neighborhood park in Daegu Metropolitan City. Thirteen urban neighborhood parks(1,841,663$m^2$) in the Daegu Metropolitan City were selected for this study. Analyzing and reviewing the previous research and literature review were conducted, and the evaluation index and analysis criteria were constructed to decide the development priority of parks. The results of this research are as follows; 1) Following to the result of the expert questionnaire test in order to estimate weight of valuation factors. It had a high score in available population, and estimated amount of the gross compensation, unpurchased land rate. On the other hand park rate of autonomous district, altitude, rate of population increase in autonomous district and a low score. 2) Generally, most f the plain type parks had a high score in the Sea level, land using pattern, an estimated amount of the gross compensation, but hill type parks had a high score the rate of green covered, park area for one person of administration building. 3) Daebong, Soosung, Dosan, 2.28 youth, Kyungnam parks were selected high priority. Soochang, Donsibong, Janggi, Dongin parks were selected middle priority. Bokhyun, Galsan, Manchon, Gusoosan parks, which were selected low priority. This research for undeveloped park is a basic research step to open up. Three many difficult things in shortage of the basic material for building valuation factor and measuring of the method measurement. The application of weight which make a decision importance among the valuation factor should have ore reasonable study and more scientific research from now because there still remains a lot of shortage of positive materials in there.

• 농업과학연구
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• 제47권4호
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• pp.1083-1096
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• 2020

Global attention to the greenhouse gas emissions from deforestation and forest degradation is increasing. There is a growing recognition of reducing emission from deforestation and forest degradation plus (REDD+) as an effective way to reduce greenhouse gas emissions in the forestry sector. The Republic of Korea is implementing REDD+ pilot projects in four Southeast Asian countries as part of its efforts to reduce greenhouse gas emissions. This study evaluates countries with the potential to become priority partner countries for Korea's REDD+ programs, using the following five criteria: The first criterion is that a country should include the forest sector and REDD+ in its national plan for reducing greenhouse gas (GHG) emissions. The second and third criteria refer to an average forest coverage rate of over 44% and a forest change rate of over - 0.1%, among the countries with forest cover of more than 10 million ha. The fourth criterion is that the country should meet the Forest Reference Emission Level requirements, one of the four elements of the Warsaw REDD+ Framework. The fifth criterion is that the country should have bilateral relations with the Republic of Korea in forestry while at the same time be a partner country for cooperation on climate change as well as a REDD+ pilot country. Based on our evaluation, we conclude that the first priority countries are Indonesia, Cambodia, and Myanmar. The second priority countries include Brazil, Ecuador, and Peru. Finally, the third priority countries are Columbia, Congo, and Mozambique. This study suggests that for the selection of priority partner countries, Korean REDD+ programs should center on existing REDD+ pilot countries.

• 한국작물학회지
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• 제49권6호
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• pp.546-551
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• 2004

사전에 수행된 델파이 조사의 기초자료를 이용하여 경종작물분야 미래유망기술들을 AHP방법을 사용하여 우선순위를 설정하였다. 8명의 전문가가 응답한 설문조사에서는 평가대항목중 공공성이 0.390으로 가장 중요하게 나타났으며, 그 다음으로는 기술성이 0.388,시장성은 0.223으로 나타났다 각 평가소항목의 세부적 중요도는 기술성 측면에서는 기술실현성, 기술파급성, 기술독창성 순으로, 시장성 측면에서는 시장성장성, 투자수익성, 시장규모성 순으로,공공성 측면에서는 국가전략과의 부합성, 산업파급성. 사회영향성 순으로 중요하게 나타났다. 각 기술군 중 중요도가 가장 높은 기술은 I군의 기술 중에서는 '친환경 저투입, 생산비절감 작물 재배기술이 개발된다'의 기술이 중요도가 0.836으로 가장 높게 나타났다. II군의 기술 중에서는 '생명공학기술을 이용한 작물의 유전자 탐색, 형질전환 및 상업화기술이 개발된다'의 기술이 중요도가 0.772로 가장 높게 나타났다.