Tuna fisheries were applied to an integrated ecosystem-based fishery risk assessment method using indexes of target species status, inhabited species in a target ecosystem, habitat quality and socio-economic benefit of affected fisheries. This study suggested more effective and efficient management measures to break away from traditional management methods, such as limitation of catch and fishing effort. The results presented that the objective risk index (ORIS) on sustainability of bigeye and yellowfin tunas by purse seine fishery was estimated high due to the high catch ratio of small fishes. The ORIs of biodiversity (ORIB) and habitat quality (ORIH) of purse seine fishery were also estimated at a high level from using fish-aggregating devices (FAD). However, due to skipjack tuna’s high catches, the ORI of socio-economic benefit (ORIE) was estimated at a very low level. Due to the high bycatch rate, ORIB was high, and ORIS and ORIH were evaluated at a low level in longline fishery. Due to strengthern of fishing restrictions and increase of fishing costs, the ORIE was assessed to be very high. The ecosystem risk index (ERI) for two tuna fisheries was assessed low, but the overall FAD management by purse seine fishery is necessary at the ecosystem level.

미국을 비롯한 선진국과 한국의 노동시장에서 학력별 노동 간 임금격차가 심화되는 현상이 나타나고 있다. 본 논문은 한국 제조업 노동시장에서 발생하고 있는 학력별 임금격차를 바탕으로 인적자본론에 근 거하여 저학력노동시장과 고학력노동시장으로 분절하고 학력별 노동수요가 어떤 요인에 영향을 받는가 를 실증분석하였다. 먼저 저학력노동과 고학력노동으로 나누어 제조업의 학력별 임금격차를 설명하였다. 분석방법으로 저 학력노동, 고학력노동과 물적자본을 생산요소로 하고 외생변수로 중립적 기술진보와 세계화를 포함한 다 요소 Cobb-Douglas 생산함수를 설정하였다. 이것을 바탕으로 비용함수를 구하고 학력별 노동수요함수를 유도하여 통계자료를 사용하여 실증분석하였다. 추정결과는 첫째 저학력노동(고졸이하)과 고학력노동(대졸 이상) 간에는 보완적 관계가, 물적자본과 고학력노동(대졸이상) 간에는 대체적인 관계가 성립하였다. 둘째 제조업 생산량은 저학력노동 수요에 양 (+)의 방향으로 영향을 미치지만 고학력노동 수요에는 통계적으로 유의미한 영향은 미치지 않았다. 셋째 세계화는 고학력노동 수요를 증가시키고 저학력노동 수요를 감소하는 방향으로 영향을 미쳤다. 넷째, 중립적 기술진보는 고학력수요를 증가하는 방향으로 영향을 미치지만 저학력노동 수요에 거의 미치지 못했다. 이런 결론을 바탕으로 정책적 제안을 정리하면 다음과 같다. 첫째 경기침체 때 생산량이 줄어들면 이에 따라 저학력노동 수요가 감소하고 실업이 발생한다. 이런 상황에 대응하여 저학력노동 고용촉진정책이 필요하다. 둘째, 투자가 감소하면 자본수요가 줄어들어 자본가격이 하락한다. 고학력노동의 상대가격이 상승하여 고학력노동 수요가 감소한다. 이에 따라 보완관계인 저학력노동 수요도 감소하게 되므로 투자촉진정책이 필요하다. 셋째 세계화가 진전될수록 저학력노동의 수요가 감소하므로 저학력노동 고용증 진정책이 필요하다.

Radon is known to be one of the representative carcinogen materials, and may cause severe health damage to the human body with long-term exposure. Without proper treatment such as natural and mechanical ventilation, indoor radon concentration tends to increase as time passes. In this aspect, it is necessary to maintain indoor radon concentration below the domestic indoor air quality (IAQ) management standard by continuous monitoring. However, the number of practical devices which can detect radon concentration is scarce and most of the existing devices are very costly. Among such devices, the RS9A, a prototype of a radon detector, detects indoor radon concentration and is priced significantly lower compared to other existing radon detectors. In this paper, we investigated the RS9A for the continuous detection of indoor radon gas and compared its performance to a commercially available radon detector (RadonEye). We measured indoor radon concentrations at two separate sites by using both detectors simultaneously. The indoor radon concentrations measured by the aforementioned detectors revealed a high correlation. Therefore, the RS9A can be considered as an appropriate candidate for use as a continuous indoor radon monitoring system.

S. aureus, E. coli, C. albicans, A. niger 등 4종의 식중독균에 대해 agar diffusion법을 이용하여 홍삼(Panax ginseng C.A.Meyer)으로부터 조제한 홍삼농축액, 조사포닌, 비수용성 분획에 대한 항균활성을 조사하였다. 그 결과, 홍삼농축액 및 비수용성분획은 E. coli, C. albicans, A. niger에 대해서는 항균활성을 나타내지 않았고 조사포닌도 고농도인 30%를 제외한 모든 농도에서 항균활성을 나타내지 않았다. S. aureus는 Gram positive 세균으로서 화농성 식중독의 원인균이면서 동시에 아토피성 피부염의 원인균으로 알려져 있는데, 홍삼농축액은 30% 농도에서 이 균에 대해 항균활성을 나타내었고 조사포닌도 7.5%에서 항균활성을 나타내었다. 홍삼으로부터 조제한 비수용성 분 획도 10~200 mg/mL 농도로 실험한 결과 모든 분획에서 항균효과를 나타내었다. 조사포닌 및 홍삼농축액의 미생물 생육저해양상을 조사하기 위해 미리 S. aureus를 접종 한 0.85% 생리식염수에 농축액 및 조사포닌을 농도별로 첨가하고 35oC, 12시간 배양한 후 생균수를 측정한 결과, 홍삼농축액은 10% 이상의 농도에서, 조사포닌은 2% 이상의 농도에서 각각 균의 생육을 억제하였다. 그러나 이러한 농도에서도 생균수는 완전히 사멸되지 않아서 홍삼농 축액 및 조사포닌의 S. aureus에 대한 생육억제작용은 살균작용이 아닌 정균 작용으로 추정되었다. 사포닌의 항균 활성 유무를 확인하기 위해 순수 분리된 ginsenoside 6종 (PT saponin, PD saponin, ginsenoside-Rb2,-Rc,-Rd,-Rf,- Rg2)의 항균활성을 50~200 μg/mL의 농도에서 조사한 결 과 모두 항균효과가 관찰되지 않아서 ginsenoside는 S. aureus에 대해서는 항균효과가 없는 것으로 사료된다. 한편 사포닌을 제외한 비사포닌 성분인 비수용성분획에 대해 상기의 4종 병원성미생물을 대상으로 항균활성을 조사한 결과 E. coli, C. albicans, A. niger에 대해서는 항균효과가 관찰되지 않았고 S. aureus에 대해서만 선택적인 항균활성을 나타내었다. 항균활성 발현 비수용성분획 중 15% methanol분획(MF-1)이 가장 높은 항균활성을 나타내어 이에 대한 최소생육저해농도를 조사한 결과 0.625 mg/mL 이었다. MF-1 분획을 질량분석기(HPLC-MS)로 조사한 결과 주요한 활성성분은 분자량 179.55 및 187.55를 가지는 물질로 추정되었다.

The purpose of this study was to evaluate indoor air pollutants of children’s facilities in libraries. The indoor pollutants, which were managed under the “Indoor Air Quality Control Standards” and “Environmental Safety Standards for Children’s Activity Zones,” were measured within five months. The new environmental pollutants such as phthalates and pesticides were also measured. The pollutant-measuring device was installed in children’s spaces in libraries and children’s libraries of the metropols. The result of investigating indoor pollutants showed that the concentration of fungus and floating bacteria had low distributions due to the use of air purifiers in all libraries. The concentration of HCHO and TVOCs was also measured lower than the environmental standards in well-ventilated libraries. On the other hand, phthalates and pesticides were detected in all libraries. In the case of heavy metals, they were mainly found in the finishing materials of the library walls and floors. As a result, indoor pollutants are managed under court receivership. On the other hand, phthalates and pesticides, which are not regulated by environmental standards should be managed because they were detected in all libraries.

Abdominal organs are the most vulnerable body parts under vehicle trauma, and there is high mortality from acute injuries in accidents. There are various ways to reduce this high mortality; one method is Resuscitative Endovascular Balloon Occlusion of the Aorta, which has recently become very popular as a minimally invasive alternative in the emergent management of patients with non-compressible hemorrhages below the diaphragm. However, high safety factor for patients is applied in actual clinical practice because there is no exact standard for the operating time. Therefore, in this study, the effects of the mechanical behavior of organ tissues for the duodenum, kidney, and liver on the operating time of Resuscitative Endovascular Balloon Occlusion of the Aorta is investigated in order to obtain data needed to establish standards of operating time. In characteristic analysis of organ tissues, uniaxial tensile test and compression test are conducted according to the operating time.

이 논문은 항만국통제라는 유엔해양법협약상의 인류 보편적인 공익모델을 활용하여 정체된 남북협력관계를 푸는 단초를 제공하고자 한다. 유엔해양법협 약 제218조, 제219조, 제220조에 따른 항만국통제를 활용하여 지역적 협력체를 체결한다면 한반도의 평화적 분위기 조성이 성취될 수 있을 것이다. 2017년 1월 Polar Code가 발효됨에 따라서 북극의 북극항로와 북서항로는 통항의 증가에 직면할 것으로 예상된다. 항만국통제의 지역협력체는 본질적으로 해사안전과 환경보호를 목표를 위한 지역적 연계와 협력을 수반하며, 이러한 항만국통제를 활성화하기 위한 논의와 지역에 대한 정보교환은 남북관계를 평화롭게 하는데 기여할 것으로 기대한다. 2004년 남북해운합의서와 지역적 협력체 양해각서의 비(非)법적 구속력 등은 남북한 양자에게도 큰 부담을 주지 않고 유엔 및 미국 등의 북한제재법령과의 충돌가능성이 최대한 낮추게 된다. 따라서 남북한이 주도적으로『북극-동북아시아 항만국통제 지역적 양해각서』(Seoul-Pyongyang MOU)의 체결을 수행할 때 한반도를 둘러싼 긴장관계를 감소할 것이다. 새로운 항만국통제 지역협력체는 인명보호, 극지역 바다의 환경과 재산을 보호하는데 기여할 뿐만 아니라 이는 바다의 영역에서 북한을 객관화된 국제사회로 초대하는 진입문이 될 수 있다.

The change of fishing power index was analyzed to identify the development of the vessel and gear technology that may improve the fishing efficiency of the offshore conger eel pot fishery from 1980s to 2015. Gross tonnage per fishing vessel was rapidly increased annually. The standard of pot was maintained, but the number of pot used rapidly increased by using conger eel pot hauling devices, carrying and loading devices, main line hauler, casting devices and slide type pot. Fish finder system to identify fishing ground information and the conger eel pot hauling devices were modernized, and supply rate was also increased. Therefore, the relative fishing power index in the offshore conger eel pot fishery increased from 1.0 in 1980 to 1.3 in 1990, to 1.8 in 2000 and to 2.0 in 2015. The results are expected to contribute to reasonable fisheries stock management of the offshore conger eel pot fishery.

Thousands of pelagic and demersal fishes inhabit the waters around Korea and many of them are overexploited. One of the reasons is technological development, which increases the efficiency of the vessels continuously. The analysis was conducted to identify the change of fishing power index to develop the vessel and gear technology that may have improved the fishing efficiency of the otter trawl fishery from 1960s to 2010s. Gross tonnage was decreased stably, but horse power was increased annually. The perimeter of net mouth was somewhat longer, but little changed. Color fish finder was utilized from the mid-1960s. Hydraulic net drum were introduced in the early 1990s, and supply rate was gradually increased. Surveys on the supply and upgrading of fishing equipment utilized visiting research. Therefore, the relative fishing power index in the trawl fishery increased about two to three times in the 2010s compared to the 1980s. The results are expected to contribute to reasonable fisheries stock management.

Monthly fluctuation in abundance and species composition of fish in coastal waters off Oenaro island, Goheung were investigated using seasonal samples collected by a shrimp beam trawl in 2018. A total of 5,981 fishes were sampled and classified into 48 species, 32 families, and 9 orders. The dominant species was Engraulis japonicus (993 individuals, 16.60%), Amblychaeturichthys hexanema (844 individuals, 14.11%), and Thryssa kammalensis (674 individuals, 11.27%). The highest number of individuals was found in August (958 individuals), while the lowest number of individuals was found in January (136 individuals). The diversity index was the highest in November (H’ = 2.37) and the lowest in January (H’ = 1.77).