• 대한한방부인과학회지
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• 제36권4호
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• pp.121-139
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• 2023

Objectives: This study was performed to analyze randomized controlled trial, which studied the effect of Saenghwa-tang treatment on postpartum prolonged lochia and uterine subinvolution. Methods: Researchers searched for randomized controlled trial of based on postpartum prolonged lochia, uterine subinvolution and Saenghwa-tang. The paper search was conducted through 6 online databases on August 10, 2023. Results: 8 studies were included after selection and exclusion criteria. 5 studies compared Saenghwa-tang alone with western medicine. 3 studies compared combined treatment of Saenghwa-tang and western medicine, with western medicine alone. Comparing with control group, the treatment group showed statistically significant improvement on total effective rate, uterine involution, serum fibrinogen, D-dimer, viscosity of blood and plasma, Erythrocyte aggregation, and various symptoms. Conclusions: This study suggests that Saenghwa-tang has benefit for treating prolonged lochia and uterine subinvolution. For reliable evidence, further research is needed to establish safety of Saenghwa-tang, standardize diagnosis criteria and specify the treatment course.

• 아동학회지
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• 제30권6호
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• pp.111-124
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• 2009

The importance of information media in personal lives has increased rapidly, indicating the average ages of users are becoming younger. School-age children, despite the inconsequential differences, are reported to have used the internet for their free time, information search, communications, and education. Recent researches are focused on various variables affecting internet-addictions since these problems have become a major issue in education due to prolonged use of the internet or mobile. The regulations as a preventative measure and the setting of standard are also considered as major issues of research. In terms of policy, there should be revisions on laws and regulations about the internet and mobile in order to protect school-age children from vicious environments. For the education's part, there should be appropriate amount of education, for children and their parents, on how to use computers and the internet properly and how to prevent internet-addiction.

• 대한토목학회논문집
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• 제3권4호
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• pp.33-45
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• 1983

레디믹스트콘크리트가 배치 플랜트에서 출하되어 현장에서 타설을 완료 할 때까지의 운반시간이 지연되는 경우가 있으며, 이로 인하여 워커빌리티가 저하되어 적절한 조치를 취하지 않고서는 시공이 어려운 문제점이 종종 야기되고 있다. 그래서 레디믹스트콘크리트의 운반시간에 따른 품질변화를 알아보며, 저하된 워커빌리티의 개선과 아울러 소요의 품질을 유지하기 위한 수단으로 시멘트와 물 및 유동화제를 추가로 첨가하는 방법과 유동화제의 적정 첨가량을 구하기 위한 실험을 실시하였다. 그 결과 레디믹스트콘크리트에 유동화제를 첨가하여 재믹싱함으로써 품질개선에 얼마간 유효한 결과를 얻었다.

• 한국지구과학회지
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• 제31권5호
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• pp.448-453
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• 2010

The population of House sparrow (Passer domesticus), once a very common bird, has declined markedly in most parts of the world including India. Sparrows were distributed widely in the district Hoogly, West Bengal, India. However over the past few decades, they became not so common in this part of the wo rld. A study has been conductedto establish the database for their current population and to assess the possible causes of their decline at Bandel ($22^{\circ}$52'22''N/$88^{\circ}$22'53''E) placed beside the river Hoogly from September 2008 to May 2009. After prolonged searching, a relatively dense population of sparrow (total subject 270) was found in busy areas of railway station and a nearby market in Bandel. The behavior of these birds was studied extensively from early morning to late night. The noise level of the area varied from 35 to 95 dB with an average of 70.6 dB from 04:30 am-10:30 pm, IST. It was also observed that the sparrows took rest on the site of the tree where the illumination level was low (30-45 lux). Sparrows residing at the Bandel station are habituated with the loud noise, being undisturbed by passing trains. Thus, it can be concluded that in spite of heavy noise of trains, crowdy travelers, and lack of nest sites, they remain at the station because of availability of food in the nearby roadside market. Based on this observation, sound pollution and availability of food are not responsible for their decline.

• 디지털융복합연구
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• 제17권9호
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• pp.135-145
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• 2019

장기불황으로 인해 한국 청년실업률이 수년간 10% 안팎의 높은 수준을 유지하고 있는 가운데, 주요 경제활동 인구인 30~40대의 실업률이 최근 상승세를 보이고 있다. 정부의 기존 청년 중심의 고용촉진 및 실업복지 정책을 30~40대를 포함한 다양한 연령층으로 확대 강화하기 위해서는 각 연령층에 대한 실업예측 모형 연구가 필요하다. 이에 본 연구에서는 한국 통계청 실업률 자료와 구글 검색어를 활용하여 한국 30~40대 연령층에 특화된 실업률 예측모형을 개발하고자 하였다. 실업률 자료와 계절성 자기회귀누적이동평균 모형을 활용하여 기초모형(Model 1)을 다중선형회귀 모형으로 추정하였으며, 개선된 모형을 구하고자 구글 검색 질의어 정보를 Model 1에 추가 활용하였다(Model 2). 그 결과, 30대와 40대 연령층 모두 구글 검색 질의어를 추가 활용한 Model 2가 Model 1보다 우수한 예측력을 보였다. 이는 웹 검색 질의어가 여전히 한국의 실업률 예측모형을 개선하는 데 유의미함을 의미한다. 본 연구는 실질적인 활용을 위해 추가적인 연구가 필요하지만, 연령대별 실업률 예측 연구에 기여할 것으로 판단된다.

• 한국융합학회논문지
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• 제12권5호
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• pp.9-16
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• 2021

전 세계적으로 COVID-19의 감염병이 장기화됨에 따라 재택근무 시 취약한 사물인터넷(IoT) 기기에 대한 네트워크 공격으로 인해 각종 보안 위협이 있다. 초기에는 사물인터넷(IoT) 기기의 사용자를 대상으로 RDP(Remote Desktop Protocol)의 취약점을 악용하고 스피어 피싱, APT 공격 등이 주로 이루어졌다. 이후 네트워크 공격의 기술이 점차 발전하여 사물인터넷 기기의 단순서비스검색프로토콜(SSDP)을 악용하여 DRDoS 공격이 지속적으로 증가하고 있다. SSDP의 인증절차의 문제점을 보완하기 위해 Notify 메시지와 M-Search 메시지 패킷에 서버 고유정보를 해시로 암호화하고 인증필드를 추가하여 인가된 IoT 기기의 여부를 판별하는 해시 기반의 SSDP을 제안한다. 해시 기반의 SSDP을 활용하면 추후 기하급수적으로 증가할 다양한 IoT 기기에 대한 정보 노출을 방지하고 증폭 공격을 사전에 차단할 것으로 기대된다.

• 한국전자통신학회논문지
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• 제17권1호
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• pp.139-146
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• 2022

COVID-19 사태 장기화로 인한 실내활동 제약으로 등산객들이 증가함에 따라 산불화재, 실종자 등 산악 사고가 증가하고 있다. 구조요원의 손길이 닿지 않는 곳에 위험 상황이 발생한다면 쿼드콥터를 활용하여 인명 수색 시간을 감소할 수 있다. 이러한 점에 착안하여 본 논문에서는 쿼드콥터의 원활한 호버링을 수행 할 수 있도록 Multiwii를 사용하여 기체의 기울기 변화에 따라 x축(Roll), y축(Pitch), z축(Yaw)의 최적화된 PID 값을 설정하여 원활한 호버링을 할 수 있도록 하였다. 또한, 카메라는 라즈베리파이에 Open CV를 설치한 후 HSV 색공간을 사용하여 인상착의와 같은 색상을 필터링한 영상을 수신하고, 색추출이 어려운 환경에서는 열화상 카메라를 사용하여 열 감지 영상을 실시간으로 수신할 수 있도록 하였으며, 2~8m 높이에서 호버링이 가능하였으며 5m 높이에서 파란색 추출이 가능하였고, 10cm 이내의 거리에서 열 감지가 가능하였다.

• 플랜트 저널
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• 제8권1호
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• pp.50-59
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• 2012

The current dual-watchdog estimation system has individually calculated the construction, the engineering and the procurement cost. The dual-watchdog estimation system is inefficient and prolonged estimation period because of the lack of the interoperability and the difference of material unit cost and construction unit cost. In order to resolve this problem, new estimation software was developed. The estimation software is developed by making up for the weak points in existing estimation method. The cost data with the same standard is the key point. And this software enhanced accuracy and speed of the data search in stylized estimation standard. A summary of the construction, the engineering and the procurement cost was generated in this estimation software. The unit rate about the labor cost, equipment and expense through a sheet was handled. The developed estimation software has five categories on engineering cost, procurement cost, construction cost and subcontractor management sheet. In this study, the estimation software to supplement the faults of the existing estimation method was developed. And estimation software on petrochemical projects increases an efficiency of the estimation work.

• 한국컴퓨터정보학회논문지
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• 제22권4호
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• pp.25-32
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• 2017

Recently, the use of NAND flash memory is being increased as a secondary device to displace conventional magnetic disk. NAND flash memory, as one among non-volatile memories, has many advantages such as low power, high reliability, low access latency, and so on. However, NAND flash memory has disadvantages such as erase-before-write, unbalanced operation speed, and limited P/E cycles, unlike conventional magnetic disk. To solve these problems, NAND flash memory mainly adopted FTL (Flash Translation Layer). In particular, garbage collection technique in FTL tried to improve the system lifetime. However, previous garbage collection techniques have a sensitive property of the system lifetime according to write pattern. To solve this problem, we propose BSGC (Balanced Selection-based Garbage Collection) technique. BSGC efficiently selects a victim block using all intervals from the past information to the current information. In this work, SFL (Search First linked List), as the proposed block allocation policy, prolongs the system lifetime additionally. In our experiments, SFL and BSGC prolonged the system lifetime about 12.85% on average and reduced page migrations about 22.12% on average. Moreover, SFL and BSGC reduced the average response time of 16.88% on average.

• Journal of Dental Anesthesia and Pain Medicine
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• 제20권3호
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• pp.107-118
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• 2020

Chloral hydrate is the oldest and most common sedative drug used in moderate sedation for pediatric dental patients. Hence, the purpose of this article is to review the safety and possible adverse events of this drug when used for pediatric dental treatment. A bibliographic search in PubMed, MEDLINE, Cochrane Library and KMbase, KISS, DBpia, KoreaMed, and RISS databases was performed. Using the keywords "dental sedation," "chloral hydrate," and "children or adolescent," 512 scientific articles were found. Subsequently, 183 studies were individually assessed for their suitability for inclusion in this literature review. Altogether, 24 studies were selected. They included 12 cases of death before, during, or after chloral hydrate sedation for dental treatment, majorly due to dosing error and use of multiple sedatives. Additionally, intraoperative adverse events were mostly respiratory problems such as hypoxia and apnea, but most events were temporary. After treatment, prolonged sedation, including excessive sleep and less activity were the most common postoperative adverse events, and even death cases were reported. Despite the wide acceptance of chloral hydrate as a sedative-hypnotic agent, the risk of adverse events and adequate dose should be of great concern when using it for pediatric dental sedation.