• Korean Journal of Environment and Ecology
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• v.31 no.5
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• pp.444-454
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• 2017

There are many ongoing studies of infectious diseases as the major factor responsible for global declining of the amphibian population. Although some point out the amphibian rearing facilities like frog farms as one of the important sources of harboring and spreading amphibian infectious pathogens in the wild, there have been few related studies in South Korea. In this study, we investigated the bacterial and fungal colonies on the skin and in the internal organs of frogs and tadpoles collected inside and outside of Dybowski's brown frog farms in Inje, Goesan, and Gongju to compare the difference according to the region and between inside and outside the farm. We also intended to classify the bacteria collected from the tadpoles into species by analyzing 16s rDNA gene sequences. The result showed that the number of bacterial colonies found in the skin and gut of frogs and the number of fungal colonies found in the skin and liver of frogs collected in Goesan was significantly greater than those in the frogs in Inje. However, there was no difference between the frogs collected inside and outside of farms in both regions. In the case of tadpoles, the number of fungal colonies in the tadpoles collected from Gongju was greater than that in the tadpoles collected from Inje. The comparison of inside and outside frog farms showed that there were more bacterial colonies on the skin of the tadpoles collected from inside than outside the frog farm in Inje and more bacterial colonies in the organs of the tadpoles collected from outside than inside the farm in Gongju. The frogs with higher condition factor (body weight/snout-vent length*100) showed fewer bacterial colonies on the skin and fewer fungal colonies in the heart, but there were no significant relationships in tadpoles. We identified the total of 15 genera and four phyla of bacteria, but the difference according to regions and between inside and outside farm was not evident. The result of this study indicates that the different conditions according to the locality of farm and between inside and outside farm cause the difference in the population sizes of bacterial and fungal colonies and that it can affect the overall health condition of Dybowski's brown frogs in the farm. Moreover, the result suggests that effective disease control in the facility is greatly necessary to ensure successful operation of amphibian rearing facility and to prevent the possible spread of diseases from the facility to the wild.

• Archives of Hand and Microsurgery
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• v.23 no.4
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• pp.254-261
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• 2018

Purpose: Favorable results have been reported after the direct repair of chronic ulnar collateral ligament ruptures of the thumb metacarpophalangeal (MP) joint, but the results for radial ligament seem rather controversial. The purpose of this study is to compare the results of ligament reattachment between chronic rupture of the ulnar and the radial collateral ligament (RCL) of the joint. Methods: We reviewed retrospectively the radiologic and clinical results of ligament reattachment with suture anchors for chronic (more than 6 weeks) rupture of the collateral ligament of the thumb MP joint with averaged 22-month follow-up. The data between 6 radial and 8 ulnar ligament repairs were compared statistically. Results: The average of postoperative ulnar deviation angle was $13.3^{\circ}$ in radial ligament and $2.0^{\circ}$ in ulnar ligament (p=0.020) in the last follow-up plain X-ray. Postoperative ligament instability was positive in 4 out of the 6 radial repairs and no case with instability was observed in ulnar ligament. In postoperative follow-up, sustained joint subluxation was observed only in 2 out of the 6 radial repairs. Conclusion: The delayed repair of the RCL of the thumb MP joint resulted in less favorable outcomes and ligament instability was observed postoperatively in more than half of the cases.

• Journal of Convergence for Information Technology
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• v.11 no.10
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• pp.230-238
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• 2021

This study sought to understand the mediating effect of job enthusiasm in relation to work-life balance and job performance of hospital workers. The data collected through a self-contained survey using structured questionnaires for employees of medical institutions in Busan and South Gyeongsang Province were analyzed using SPSS 26.0 and Process Macro programs. As a result of the analysis, job performance and non-role performance were the most influenced by passion (+), and work-life balance was evaluated as a factor that increased job enthusiasm. In addition, work-life balance directly influenced job performance, but indirectly influenced job performance as a medium. In particular, the work-life balance and the relationship between performance other than roles were fully mediated. In order to improve the job performance of hospital workers at the organizational level, it is necessary to increase job enthusiasm, which means that efforts are needed to establish an organizational culture that values work-life balance.

• Journal of Convergence for Information Technology
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• v.11 no.6
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• pp.162-170
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• 2021

This study attempted to grasp the causal relationship, focusing on the double mediating effect of career identity and career decision self-efficacy in the relationship between grit and career preparation behavior. Data were collected by a self-entry method using structured questionnaire for dental hygiene student in area B. And it was analyzed using SPSS and Process Macro. The biggest factor directly influencing career preparation behavior was career identity, followed by grit and career decision self-efficacy. Through path analysis, grit indirectly had a significant influence on career preparation behavior through the mediating sense of career identity and the sense of career identity and career decision self-efficacy. This suggests that grit and career identity should be enhanced for active career preparation behavior, so it is intended to be used as basic data for career education contents development for college students majoring in dental hygiene.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.72-72
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• 2019

간무봉(555.8m)은 강원도 인제군 남면에 위치하고 있다. 북한강의 지류인 소양강으로 대부분 둘러싸여 있으며 북서쪽에 봉화산(874.4m), 북동쪽에 기룡산(940.4m)과 이어진다. 현재까지 간무봉을 대상으로 한 식물상 조사 이력은 없었으나, DMZ 일원에 위치하는 산이기 때문에 DMZ의 식물상 연구를 위한 기초 자료로 보전하고 탐색하는 의미가 있다. 현지조사는 2018년 4월부터 10월까지 총 6회 수행하였다. 간무봉에는 굴참나무, 신갈나무, 소나무가 우점하고 있는 형태였으며, 조사 결과 관속식물은 73과 175속 211종 3아종 27변종 4품종으로 총 245분류군이 조사되었다. 그 중 양치식물은 고비, 고사리삼, 십자고사리, 퍼진고사리 4분류군이고, 나자식물은 소나무, 일본잎갈나무 2분류군, 피자식물은 노랑제비꽃, 은방울꽃, 꽃향유 등 205분류군이었다. 이는 우리나라 관속식물 4,494분류군(국립수목원, 2016)의 5.45%에 해당한다. 간무봉에서 확인한 특산식물은 진범, 할미밀망, 갈퀴아재비, 병꽃나무 등 6 분류군이며, 희귀식물은 미치광이풀(LC), 말나리(LC) 2 분류군 이외에 VU 이상에 해당하는 희귀식물은 발견하지 못하였다. 그리고 침입외래식물(국립수목원, 2016)의 경우 미국자리공, 수박풀, 미국쑥부쟁이, 단풍잎돼지풀 등 17 분류군이었다. 간무봉 주변에는 경작지, 군부대 훈련장소 등이 있으며, 서쪽 사면은 이미 벌목이 많이 된 상태이며, 북동쪽도 마을과 더불어 경작지로 개간되어 있다. 따라서 주변의 외부에서 가해지는 인위적인 간섭이 많은 상태라고 볼 수 있으며, 이미 유입된 단풍잎돼지풀 등 생태계교란종에 의한 변화에도 유의할 필요가 있다.

• Journal of the Korean Electrochemical Society
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• v.26 no.1
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• pp.11-18
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• 2023

As the use of lithium-ion secondary batteries is rapidly increasing due to the rapid growth of the electric vehicle market, the disposal and recycling of spent batteries after use has been raised as a serious problem. Since stored energy must be removed in order to recycle the spent batteries, an effective discharging process is required. In this study, graphite and NCM622 were used as active materials to manufacture coin-type half cells and full cells, and the electrochemical behavior occurring during overdischarge was analyzed. When the positive and negative electrodes are overdischarged respectively using a half-cell, a conversion reaction in which transition metal oxide is reduced to metal occurs first in the positive electrode, and a side reaction in which Cu, the current collector, is corroded following decomposition of the SEI film occurs in the negative electrode. In addition, a side reaction during overdischarge is difficult to occur because a large polarization at the initial stage is required. When the full cell is overdischarged, the cell reaches 0 V and the overdischarge ends with almost no side reaction due to this large polarization. However, if the full cell whose capacity is degraded due to the cycle is overdischarged, corrosion of the Cu current collector occurs in the negative electrode. Therefore, cycled cell requires an appropriate treatment process because its electrochemical behavior during overdischarge is different from that of a fresh cell.

• The Journal of the Korea Contents Association
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• v.15 no.12
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• pp.234-246
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• 2015

When the Information age led by media comes, The literature yielded its prominence to visual media, and the Korean literature also faced a crisis, prompted by decreased demand for it. In this reality, literature festivals which have increased rapidly since 1995 and currently number at least 110, when the local government system was launched, played an important role in promoting literature to the society. This thesis has selected Manhae Festival, one of the most vibrant and successful, as the case study to analyze its present status and accomplishments to derive ways for improvement which can be used to promote policies on literature. Manhae Festival which celebrates Manhae Han Yongun, a poet and an independence activist, also became one of the top literature festivals through Manhae Grand Awards and various cultural, art and academic events, despite being held in Inje County, Gangwon Province, a remote location. Based on this study, in the near future, Manhae Village, as a complex cultural venue, as a If we can make the place into complex cultural space and with additional policy support by gaining political supports like designation as Slowcity and special zone of culture and tourism, and pursuing glocalization by making Manhae into a star brand, Manhae Festival will cement its current position as a successful literary festival. It has very meaningful since most of literature festivals operate in small scale. Now, we need to develop literature festivals into local ones by attracting larger popularity. Meanwhile, a more comprehensive study, in the future, is needed with special emphasis on successful literary policies and their precedents in other countries.

• Journal of the Korean Society of Radiology
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• v.16 no.4
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• pp.381-386
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• 2022

Non-Destruction Test (NDT) is a method to check internal defects without destroying the product. Among them, radiographic testing (RT) uses high-energy radiation, so it is very important to prevent radiation exposure of workers. Therefore, in this study, in this study, a radiation sensor structure that improves radiation detection performance compared to the existing PbI₂ and can immediately detect accidents in RT was presented. For evaluation, the conversion efficiency was analyzed in the gamma ray source through FLUKA simulation. PbI₂ with overlapping Gd₂O₂S:Tb presented in this study showed a higher radiation sensitivity from 1.22 to 3.22 times than that of non-overlapping PbI₂. This indicates that the presented sensor is suitable for use as a radiation sensor for source detection in RT.

• Journal of Life Science
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• v.29 no.10
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• pp.1126-1135
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• 2019

From a sample of bamboo byproduct, the protease-producing yeast strain CO-1 was newly isolated. Strain CO-1 is spherical to ovoid in shape and measures $3.1-4.0{\times}3.8-4.4{\mu}m$. For the growth of strain CO-1, the optimal temperature and initial pH were $30^{\circ}C$ and 4.0, respectively. The strain was able to grow in 0.0-15.0%(w/v) NaCl and 0.0-9.0%(v/v) ethanol. Based on a phylogenetic analysis of its 18S rDNA sequences, strain CO-1 was identified as Pichia anomala. The extracellular protease produced by P. anomala CO-1 was partially purified by ammonium sulfate precipitation, which resulted in a 14.6-fold purification and a yield of 7.2%. The molecular mass of the protease was recorded as approximately 30 kDa via zymogram. The protease activity reached its maximum when 1.0%(w/v) CMC was used as the carbon source, 1.0%(w/v) yeast extract was used as the nitrogen source, and 0.3%(w/v) $MnSO_4$ was used as the mineral source. The protease revealed the highest activity at pH 7.0 and $30^{\circ}C$. This enzyme maintained more than 75% of its stability at a pH range of 4.0-10.0. After heating at $65^{\circ}C$ for 1 hr, the neutral protease registered at 60% of its original activity. The protease production coincided with growth and attained a maximal level during the post-exponential phase.

• Journal of the Korean Society of Radiology
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• v.17 no.3
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• pp.441-447
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• 2023

Lead(Pb), which is currently mainly used for shielding purposes in the medical radiation, has excellent radiation shielding functions, but is continuously exposed to radiation directly or indirectly due to the harmfulness of lead itself to the human body and the inconvenience caused by its heavy weight. Research on shielding materials that are human-friendly, lightweight, and convenient to use that can block risks and replace lead is continuously being conducted. In this study, based on the commonly used polyethylene terephthalate (PET) film and the fabric material used in actual radiation protective clothing, a multi-layer thin film was realized through sputtering and vacuum deposition of bismuth, tungsten, and tin, which are metal materials that can shield radiation. Thus, a shielding film was produced and its applicability as a radiation shielding material was evaluated. The radiation shielding film was manufactured by establishing the optimized conditions for each shielding material while controlling the applied voltage, roll driving speed, and gas supply amount to manufacture the shielding film. The adhesion between the parent material and the shielding metal thin film was confirmed by Cross-cut 100/100, and the stability of the thin film was confirmed through a hot water test for 1 hour to measure the change of the thin film over time. The shielding performance of the finally realized shielding film was measured by the Korea association for radiation application (KARA), and the test conditions (inverse wide beam, tube voltage 50 kV, half layer 1.828 mmAl) were set to obtain an attenuation ratio of 16.4 (initial value 0.300 mGy/s, measured value 0.018 mGy/s) and damping ratio 4.31 (initial value 0.300 mGy/s, measured value 0.069 mGy/s) were obtained. by securing process efficiency for future commercialization, light and shielding films and fabrics were used to lay the foundation for the application of films to radiation protective clothing or construction materials with shielding functions.