• 수산경영론집
• /
• 제55권3호
• /
• pp.27-42
• /
• 2024

As global climate change impacts become more apparent, countries are implementing various policies to achieve carbon neutrality that can be categorized into direct regulations and market-based indirect regulations. The latter, utilizing economic incentives, is considered more efficient in transforming corporate behavior and promoting voluntary efforts for carbon reduction. In alignment with international trends, South Korea has introduced the Emission Trading System (ETS) in 2015. Despite this, the domestic carbon market remains underdeveloped, with low ETS participation, particularly in the aquaculture sector. In order to activate external projects under the ETS, this study proposes short-term strategies including linking ETS with popular eco-friendly energy distribution projects, developing standardized monitoring techniques, and integrating carbon reduction initiatives with other support mechanisms such as direct payment programs. Long-term strategies focus on developing new methodologies for external projects, promoting the use of renewable energy, and enhancing technologies to reduce energy consumption in aquaculture operations. By implementing these strategies, the study aims to enhance the participation of the aquaculture sector in carbon reduction efforts, contributing to the overall goal of carbon neutrality.

• 한국가축번식학회지
• /
• 제16권4호
• /
• pp.301-310
• /
• 1993

This experiment was performed to develop simple practical methods for short term preservation of rabbit embryos. A total of 55 cross bred does were superovulated by intramuscular injection of PMSG and HCG. Embryos were recovered at 25~30 hrs, 60~65 hrs and 80~85 hrs after mating and selected by morphological examination. Four cell stage, morulae and blastocyst embryos were stored in PBS enrich with 1, 10, 20 and 40% heat-treated FCS at 4, 20, 30 and 37$^{\circ}C$, respectively. Embryos were examined morphologically at 24, 48 and 72 hrs following storage. The result obtained in this experiment were summarized as follows: The superovulation was induced by PMSG 200 IU and HCG 100 IU. The average number of ovulation points and embryos recovered by collection time were 19.0, 15.6(25~30 hr), 17.3, 13.5(60~65 hr) and 19.2, 14.4(80~85 hr), respectively. And recovery rates of embryos recovered at 25~30 hr, 60~65 hr and 80~85 hr after mating were 62.8%(4 cell), 84.7%(morulae) and 79.6%(blastocyst), respectively. On the other hand, the average number of ovulation points collected by the no, of operations for the repeated collection was 17.3(60~65 hr), 19.2(80~85 hr) in 1st and 9.4(60~65 hr), 10.6(80~85 hr) in 2nd surgery, respectively. There was a significant decrease(P<0.05) in the number of ovulation points the 2nd surgery as compared to the 1st surgery. All of the 4-cell stage embryos stored at 4$^{\circ}C$ for 48 hrs showed the same morphology throught the storage period, on the contrary, 4-cell stage embryos stored at 2$0^{\circ}C$ and 3$0^{\circ}C$ for 48 hrs showed degeneration embryos and stored at 37$^{\circ}C$ for 24 hrs showed degeneration embryos. Morulae and blastodcyst stored at 4, 20, 30 and 37$^{\circ}C$ for 24 hrs showed degeneration embryos. All of the blastocyst stored at 37$^{\circ}C$ for 72 hrs showed degeneration embryos.

• Journal of Chest Surgery
• /
• 제11권2호
• /
• pp.227-231
• /
• 1978

Since January 1973 we have performed 47 arteriovenous shunts and 22 arteriovenous fistulas for 57 patients with acute or chronic renal failure. Of these 57 cases, 50 cases had chronic renal failure and the other 7 cases had acute renal failure. The most frequent complications after operations were thrombosis, bleeding and infection. Less frequently dislodgement of shunt and aneurysmal change of the fistula were found. After 47 arteriovenous shunts, 21 those complications [44%] were found. On the other hand after 22 arteriovenous fistulas, 5 complications were found. Now we are using the arteriovenous shunt only for the patients who need emergency short term hemodialysis and temporary dialysis until arteriovenous fistula could be used.

• 전자공학회논문지B
• /
• 제30B권3호
• /
• pp.31-40
• /
• 1993

This paper deals with the modeling and scheduling for FMC(Flexible Manufacturing Cells). The FMC system composed of unit or multi cells is capable of improving productivity with flexibility for machine. However, the properties of multiple jobs and various alternatives results in tne dynamic states which make system management very complex. The extended Peti nets are used to represent for complex properties of FMC which performs short-term scheduling and dynamic operational scheduling. The hierarchical control structure and integlligent scheduling through expert module are adopted for efficiency of FMC operations. The computer simulation reveals that intelligent scheduling method is better than heuristics in various performance indices.

• 경영과학
• /
• 제25권3호
• /
• pp.123-133
• /
• 2008

We investigate the relationship between ownership structure and firm performance. For this paper, we use the 'donation' figure from the income statement of each firm as a measure of firm Performance lather than short-term financial measure that has been wifely used by previous studies. Our results are consistent with the idea that family ownership is both prevalent and substantial in Korea. More importantly, however, non-family firms are found to give more donations than family firms. This suggests that non-family firms more readily recognize the significance of corporate social responsibility and play an active role in philanthropy.

• 경영과학
• /
• 제34권2호
• /
• pp.1-14
• /
• 2017

Recently, despite the presence of a large number of people with disabilities, facilities and services for the disabled are insufficient in comparison with the advanced countries. Especially, unmanned facilities and devices are not available for disabled people without help. As interest in disabled people increased, the convenient facilities for the disabled person should be legally installed in the public places. Moreover, social consensus formation and technical approaches are being actively pursued. In this paper, we propose a five-step scenario to use an unmanned post office. Based on the proposed scenario, we present the method to improve the accessibility of the user interface of the unmanned facilities. And we present a plan for establishing the short- and medium-term service models. This plan is expected to be highly practicable because it reflects the current situations of Korea Post and analysis result of the domestic and oversea cases.

• 한국ITS학회 논문지
• /
• 제22권5호
• /
• pp.1-18
• /
• 2023

최근 빅데이터 및 딥러닝 기술의 발전으로 다양한 교통정보가 널리 수집 및 활용되고 있다. 특히 시계열 특성을 갖는 교통정보 예측 분야에서는 장단기 메모리(long short term memory, LSTM)가 널리 사용되고 있다. LSTM에 입력되는 시계열 데이터의 추세, 계절성, 주기 등이 상이하기 때문에 시계열 데이터를 기반으로 한 예측 모델에서도 데이터의 특성에 따라 하이퍼 파라미터의 적합한 값을 찾는 시행착오법이 필수적이다. 이에 적합한 하이퍼 파라미터를 찾는 방법론이 정립된다면, 정확도가 높은 모델 구성에 소요되는 시간을 줄일 수 있다. 따라서, 본 연구에서는 국내 고속도로 차량검지기 데이터와 LSTM을 기반으로 교통정보 예측 모델을 개발하였으며, LSTM의 하이퍼 파라미터별 평가지표 변화를 통해 예측 결과에 미치는 영향평가를 수행하였다. 또한, 이를 기반으로 교통분야에서 고속도로 교통정보 예측에 적합한 하이퍼 파라미터를 찾는 방법론을 제시하였다.

• 한국지리정보학회지
• /
• 제10권3호
• /
• pp.13-21
• /
• 2007

최근 기상이변에 따른 국지성 돌발 홍수의 빈번한 발생으로 인해 레이더 등을 이용한 초단기 강수예보의 필요성이 대두되고 있다. 본 연구는 시공간 분포를 적절하게 표현할 수 있는 레이더 강우시계열자료와 GIS기반의 분포형모형을 연계하여 국내 댐유역에 적용해 봄으로써, 분포형모형의 홍수유출시 실무에서의 적용가능성을 검증해 본 것이다. 본 연구에서 사용한 물리적기반의 분포형모형으로는 미국 오클라호마 대학에서 개발한 Vflo모형을 이용하였으며, 낙동강권역의 남강댐유역($2,293km^2$)을 시험유역으로 적용하였다. 입력강우로는 진도레이더로 부터 레이더강우 전처리프로그램인 K-RainVieux를 이용하여 모형의 격자해상도에 맞는 분포형 강우를 생성하였다. 또한, GIS수문매개변수를 DEM, 토지피복도, 토양도 등의 기본 GIS자료들로 부터 추출, 물리적기반의 분포형모형(Vflo)의 입력인자로 사용하여 모형의 초기설정을 향상시켰다. 본 연구의 성과는 향후 돌발홍수에 대응한 실시간 단기 강우유출예측시스템을 구축하기 위한 기반이 될 것으로 사료된다.

• 지능정보연구
• /
• 제29권1호
• /
• pp.107-119
• /
• 2023

군인의 동작 및 운동 상태를 인식하는 기술은 웨어러블 테크놀로지와 인공지능의 결합으로 최근 대두되어 병력 관리의 패러다임을 바꿀 기술로 주목받고 있다. 이때 훈련 상황에서의 평가 및 솔루션 제공, 전투 상황에서의 효율적 모니터링 기능을 의도한대로 제공하기 위해서는 상태 판별의 정확도가 매우 높은 수준으로 유지되어야만 한다. 하지만 입력 데이터가 시계열 또는 시퀀스로 주어지는 경우, 기존의 피드포워드 신경망으로는 분류 성능을 극대화하는데 한계가 발생한다. 전장에서의 군사 동작 인식을 위해 다뤄지는 인간의 행동양식 데이터(3축 가속도 및 3축 각속도)는 시의존적 특성의 분석이 요구되기 때문에, 본 논문은 순환 신경망인 LSTM(Long-short Term Memory) 네트워크를 활용하여 취득 데이터의 이동 양상 및 순서 의존성을 파악하고 여덟 가지의 대표적 군사 동작(Sitting, Standing, Walking, Running, Ascending, Descending, Low Crawl, High Crawl)을 분류하는 고성능 인공지능 모델을 제안한다. 이때, 학습 조건 및 모델 변수는 그 정확도에 결정적인 영향을 끼치지만 인간의 수동적 조정이 필요해 비용 비효율적이고 최적의 값을 보장하지 못한다. 본 논문은 기계 스스로 일반화 성능이 극대화된 조건들을 취득할 수 있도록 베이지안 최적화를 활용해 하이퍼파라미터를 최적화한다. 그 결과, 최종 아키텍쳐는 학습 가능한 파라미터의 개수가 유사한 기존의 인공 신경망과 비교해서 오차율이 62.56% 감소할 수 있었으며, 최종적으로 98.39%의 정확도로 군사 동작 인식 기능을 구현할 수 있었다.

• Safety and Health at Work
• /
• 제8권3호
• /
• pp.237-245
• /
• 2017

Background: Solar furnaces are used worldwide to conduct experiments to demonstrate the feasibility of solar-chemical processes with the aid of concentrated sunlight, or to qualify high temperature-resistant components. In recent years, high-flux solar simulators (HFSSs) based on short-arc xenon lamps are more frequently used. The emitted spectrum is very similar to natural sunlight but with dangerous portions of ultraviolet light as well. Due to special benefits of solar simulators the increase of construction activity for HFSS can be observed worldwide. Hence, it is quite important to protect employees against serious injuries caused by ultraviolet radiation (UVR) in a range of 100 nm to 400 nm. Methods: The UV measurements were made at the German Aerospace Center (DLR), Cologne and Paul-Scherrer-Institute (PSI), Switzerland, during normal operations of the HFSS, with a high-precision UV-A/B radiometer using different experiment setups at different power levels. Thus, the measurement results represent UV emissions which are typical when operating a HFSS. Therefore, the biological effects on people exposed to UVR was investigated systematically to identify the existing hazard potential. Results: It should be noted that the permissible workplace exposure limits for UV emissions significantly exceeded after a few seconds. One critical value was strongly exceeded by a factor of 770. Conclusion: The prevention of emissions must first and foremost be carried out by structural measures. Furthermore, unambiguous protocols have to be defined and compliance must be monitored. For short-term activities in the hazard area, measures for the protection of eyes and skin must be taken.