• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.3
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• pp.185-191
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• 2012

Most of Korean farms have been developed in the semi-closed bay, and its position is very vulnerable to the coastal contamination due to the long term and the high density. So, mariculture management is very essential for the sustainable aquaculture. Some of the specific ways would be the assessment of the optimal stocking density for mariculture management zone and this has to consider both the suitable site selection and the assessment of ecological carrying capacity. Habitat suitability index(0.0 totally unsuitable habitat, 1.0 optimum habitat) and ecological indicator(Filtration pressure indicator) was used to assess the stocking density for oyster farms in Geoje-Hansan Bay. Geoje Bay showed the higher habitat suitability index value 0.75 than Hansan Bay 0.53, indicating that Geoje Bay is more suitable for oyster farming. Ecological indicator showed different stocking density according to the coastal characteristics in Geoje-Hansan Bay. Consequently, it is desirable that the stocking density in Geoje Bay should reduce average 40% and Hansan Bay, average 60% than present, in order to meet the ecological carrying capacity. The assessment of the stocking density could solve various problems such as the coastal contamination, environmental aggravation and the productivity decrease and this study could be a scientific basis to establish the policies for mariculture management.

• Proceedings of the Malacological Society of Korea Conference
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• 2001.11a
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• pp.35-36
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• 2001

해양의 유기물 합성의 95%를 담당하는 식물프랑크톤은 해양 먹이연쇄의 1차 생산자로서 이들을 여과 섭식하는 이매패류는 식물프랑크톤의 분포나 양에 따라 그 생산이 좌우된다. 그러나 이 식물프랑크톤의 분포는 동일한 해역이라도 영양염류, 수온, 태양광선의 세기와 해수면에 입사된 광선이 해수 중에서 소멸되는 정도 등에 따라 생선속도가 달라지므로 동일해역에서도 분포의 변이가 매우 심하다. 기초생산력의 차이는 굴 성육에 관계되므로 여과섭식성 이매패류 양식장의 생산성 평가의 기초자료로 이용되고 있다(배 등, 1978; 이 등, 1991). 이 연구는 북만의 기초생산력을 조사하여, 다른 해역과 비교하고 먹이생물의 생산능력에 의한 굴양식장 수용력을 검토하는 자료로 제공하였다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.357-358
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• 2001

산소는 모든 육상 동식물뿐만 아니라 수중 동식물의 생명 유지에 가장 필수적인 요소이다. 양식에 있어 산소는 고밀도 사육시 환경 수용력을 조절하는 요인으로 그 중요성은 생물학적 그리고 경제적인 면에서도 강조되고 있다. 산소 소비량에 대한 연구는 담수어류를 대상으로 꾸준히 진행되어 오고 있으나, 해산어류의 경우 산소 소비량과 관련한 연구는 미흡한 실정이다(Honda 1988; Kikuch et al., 1990; Lemarie et al., 1988). 해산어류를 대상으로 한 산소소비량의 연구는 주로 채수를 통하여 측정하였기 때문에 단위 시간당 측정할 수 있는 횟수는 한정되어 있어 정확한 산소 소비량을 산출하기 어렵다. (중략)

• The Journal of Information Technology
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• v.4 no.3
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• pp.65-75
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• 2001

Code-division multiple access has been widely accepted as the major multiple access scheme in mobile communication systems. Wide-band CDMA and its hybrid associate time-division CDMA are key elements in the mobile communication. Since 10 years ago, there has been enormous research activity in analysis of the capacity of these CDMA-based systems. Recently, upgrading service, high quality and the different service classes in radio resource allocation has recently increased. This paper presents an overview of Radio Resource Allocation on the CDMA-based systems that are flexible, support traffic services, minimize call blocking rate and have acceptable radio resource utilization.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.739-742
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• 2005

본 논문은 디지털 영상 데이터를 대상으로 웨이블릿 변환을 이용하여 주파수 영역에서 워터마크를 삽입하는 블라인드 워터마킹 알고리즘을 제안한다. 실험을 통하여 다양한 임계치에 따른 워터마크 정보의 수용력과 영상의 손실 정도(PSNR), 저작권 인증 여부와 검출 값(Correlation response) 사이의 관계(Trade-off)들을 고려하여 최적의 임계치에 관하여 연구한다. 또한 인간의 시각적인 특성을 고려한 HVS(Human visual system) 기법을 적용하여 영상의 비가시도를 유지하면서 시각적으로 중요한 영역에 워터마크를 삽입하여 일반적인 공격에 강인성을 가지는 워터마킹 방법을 연구한다. 워터마크로서 가우시안 랜덤 수열(Gaussian Random sequence)을 삽입하여 최적의 임계값을 적용한 제안된 알고리즘의 성능 평가를 위해 여러 영상에 대하여 실험해 본 결과 워터마크가 삽입된 영상의 화질은 비가시도 측면에서 시각적으로 인지할 수 없을 만큼 측정되었으며, JPEG 손실압축, 선형 필터링, 잡음첨가 그리고 크로핑 등의 공격에 대하여 향상된 상관도와 강인함을 알 수가 있었다.

• Korean Journal of Environment and Ecology
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• v.1 no.1
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• pp.46-65
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• 1987

This study was excuted to measure the user's impact area of the Bukhan Mountain National Park. Eighteen sites of the campsite and the picnic area were sample to measure the impact rating of soil and vegetation. And three belt transects were sampled to analyze soil properties and vegetational change by the user's impact. Also user's psychology was investigated through questionnaires with the visitor and 726 answers were collected from May to June in 1987. The regression equation was significant between the distance and the soil hardness. individual number per 100$m^2$, herb coverage and similarity index from the center of picnic area to the non-use site. The tolerant tree against user's impact are Lespedza maximowiczii. Stephanandra insica, Actinidia arguta Symplocos chinensis for. pilosa and the sensitive trees were Fraxinus rhy chophylla Sorbus alnifolia. and Rhodadendron mucronulatun. The facilities factor and social factor are the most affecting factors to User's psychology by the varimax rotated factor analysis. The carrying capacity of the picnic area was 25$m^2$ per man by the degree of psychological satisfaction.

• Journal of Music and Human Behavior
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• v.19 no.2
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• pp.55-80
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• 2022

This study aimed to examine the effects of songwriting on the self-acceptance of adolescent in palliative care. Three participants were recruited from a university hospital in an urban area in South Korea. The songwriting intervention was conducted in six sessions, and each session was composed of an introduction, song writing and wrap-up. Participants were asked to complete the Unconditional Self-Acceptance Questionnaire (USAQ) before and after the intervention. Their verbal expressions and written song lyrics observed during the intervention were also measured. The results showed that the USAQ scores increased after the intervention, indicating the improvement in their acceptance of the self without judgement or high reactivity to feedback. In addition, the participants exhibited greater recognition of their emotions and acceptance of themselves as they are. They were also better able to discover internal resources and psychological competence. The participants reported that they could more freely express their emotions through song writing and that recording the songs they created was a means of communicating their feelings to others. Based on this study, it is expected that adolescents in palliative care will be able to experience self-acceptance through such brief song writing interventions.

• Journal of the Korea institute for structural maintenance and inspection
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• v.10 no.5
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• pp.211-217
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• 2006

This analysis evaluated small and large temperature gradient effects on the FRP deck considering lightweight of FRP deck and ply orientations at the interface between steel girders and FRP deck. Finally, the analytical results shows the possible failure mechanism of FRP deck under various temperature changes and its corresponding index is suddenly varied depending on the rapid change of temperature on the deck plate.

• The Journal of Fisheries Business Administration
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• v.45 no.3
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• pp.55-69
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• 2014

We try to test the pecking order theory of Korean fisheries firm's capital structure using debt capacity. At first, we estimate the debt capacity as the probability of assigning corporate bond rating from credit-rating agencies. We use logit regression model to estimate this probability as a proxy of debt capacity. The major results of this study are as follows. Firstly, we can confirm the fisheries firm's financing behaviour which issues new debt securities for financial deficit. Empirical test of SSM model indicates that the higher probability of assigning corporate bond rating, the higher the coefficient of financial deficit. Especially, high probability group follows this result exactly. Therefore, the pecking order theory of fisheries firm's capital structure applies well for high probability group which means high debt capacity. It also applies for medium and low probability group, but their significances are not good. Secondly, the most of fisheries firms in high probability group issue new debt securities for their financial deficit. Low probability group's fisheries firms also issue new debt securities for their financial deficit within the limit of their debt capacity, but beyond debt capacity they use equity financing for financial deficit. Therefore, the pecking order theory on debt capacity come into existence well in high probability group.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.4
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• pp.189-197
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• 1993

The management of wastes within the urban landscape has become a critical concern to both local governments and inhabitants. With landfill capacities steadily decreasing, rapid growth of economy, population and urbanization, citizen awareness of the environment and public health problems occured by existing landfill sites make difficulties in selecting the landfill site. Therefore, this study has been performed to select the optimum waste landfill site using GSIS methodology to reduce the time, cost and effort. As the result of this study, we can investigate many factors synthetically which could not be handled by the former method using hands in the site selection for waste landfill, and we can carry out economically the work of selecting suitable site throughout the vast area.