• 한국환경농학회지
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• 제32권4호
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• pp.260-267
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• 2013

본 연구는 고추재배시험 기간 동안 축분퇴비의 시용량과 비닐멀칭 유무에 따른 토양 유기탄소의 함량 변화와 토양 탄소의 안정화 정도를 조사하기 위해 실시되어졌다. 고추재배기간 동안 퇴비의 시용과 비닐멀칭 처리에 따라 토양 내 유기탄소 함량의 유의한 증가는 발견되어지지 않았다. 또한 퇴비시용과 비닐멀칭 처리에 의한 토양의 물리적 특성 변화는 관찰되지 않았다. 이러한 결과는 본 연구의 짧은 조사기간과 관련이 있는 것으로 판단된다. 그러나 퇴비의 시용에 의해 쉽게 분해 가능한 형태인 열수추출 가능한 탄소의 함량은 유의하게 감소하는 결과를 나타내었다. 추천량인 20 Mg/ha의 퇴비를 시용하였을 때 지하부의 바이오매스 함량이 최대를 나타내었다. 이상의 결과를 미루어 볼 때 장기적으로 추천량의 퇴비를 지속적으로 시용한다면 토양 유기탄소의 함량 증대와 안정화 정도를 향상시킬 수 있을 것으로 판단된다.

• Korean Journal of Acupuncture
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• 제34권1호
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• pp.47-55
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• 2017

Objectives : The purpose of this study is to evaluate the feasibility of further acupuncture research as an effective alternative and safe treatment for abdominal pain control in patients with pancreatitis. Methods and Results : This study is an open-label, assessment-blind, parallel designed pilot clinical trial. Thirty participants will be assigned to the acupuncture group(n=15) and usual care group(n=15). All patients will receive the conventional standard-of-care(SOC) therapy, but only the experimental group will receive acupuncture therapy six times a week, and the duration of acupuncture therapy will be held up to 12 weeks or until the pains are to be resolved. For the conventional SOC therapy, painkiller will be given. In treatment group, the subjects will receive the identical SOC therapy in combination with electroacupuncture therapy on twelve acupuncture points(LI4, PC6, SP6, GB39, ST36, ST37), and auricular acupuncture therapy on five auricular acupuncture points(Sympathetic, Shen Men, Abdomen, Pancreas gall, and Spleen). The primary outcome will be measured using the visual analogue scale(VAS), and the secondary outcome will be measured using the painkiller demand, quality of life index and severity of pancreatitis by abdominal computed tomography(CT). Assessments will be made at baseline and at week 1, 4, 8 and 12. Results of abdominal CT will be evaluated at baseline and at week 12. Conclusions : The result of this trial will provide a basis for the effectiveness and safety of acupuncture treatment for abdominal pain in patients with pancreatitis.

• 대한토목학회논문집
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• 제41권4호
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• pp.417-428
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• 2021

사회기반시설의 장래유지 관리비용 추정은 불확실한 미래를 다루기 때문에 신뢰성 높은 파손예측모델의 구축이 매우 중요하다. 하지만, 지자체에서는 예산, 인력, 파손예측모델의 필요성 등에 대한 인식부족으로 인해 기반시설의 정확한 파손예측모델 개발이 어려운 실정이다. 따라서 본 연구에서는 베이지안 마르코프 혼합해저드 모델을 활용하여 일반국도 아스팔트 도로포장의 균열률에 대한 지역별 기대수명을 추정하였다. 또한 정확한 기대수명 추정을 위하여 교통량, 축하중, 포장강도, 기후, 제설제사용량 등의 환경변수를 적용하여 추정결과에 대한 신뢰성을 확보하고자 하였다. 분석결과, 지역별로 최소 13.09년에서 최대 19.61년의 기대수명이 추정되었다. 본 연구결과를 활용할 경우, 지역적 파손특성이 고려된 신뢰성 높은 장래 유지관리비용의 추정이 가능할 것으로 기대된다.

• Journal of Power Electronics
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• 제9권1호
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• pp.51-60
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• 2009

Hybrid Electric Vehicles (HEVs) utilize electric power as well as a mechanical engine for propulsion; therefore the performance of HEV s can be directly influenced by the characteristics of the Energy Storage System (ESS). The ESS for HEVs generally requires high power performance, long cycle life and reliability, as well as cost effectiveness. So the Hybrid Energy Storage System (HESS), which combines different kinds of storage devices, has been considered to fulfill both performance and cost requirements. To improve operating efficiency, cycle life, and cold cranking of the HESS, an advanced dynamic control regime with which pertinent storage devices in the HESS can be selectively operated based on their status was presented. Verification tests were performed to confirm the degree of improvement in energy efficiency. In this paper, an advanced HESS with improved an Battery Management System (BMS), which has optimal switching control function based on the estimated State of Charge (SOC), has been developed and verified.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2016년도 전력전자학술대회 논문집
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• pp.311-312
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• 2016

본 논문에서는 사이즈가 다른 고출력 원통형 리튬이온 배터리의 Remaining Useful Life(RUL)을 방전용량 기반으로 전기적 특성분석을 실시하였다. 우선, 배터리의 충/방전이 계속될 시 용량이 어떻게 변화하는지 실험해보았으며, 만충 전압(Fully Charged)에서 만방 전압(Fully Discharged) 까지의 각각의 State-Of-Charge(SOC)에서 Hybrid Pulse Power Characterization (HPPC) Test를 이용해 충전 저항과 방전 저항을 구하여, 용량과 저항의 관계를 파악하였으며, 배터리 RUL을 알기 위한 기본 정보를 확보했다.

• 조명전기설비학회논문지
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• 제29권8호
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• pp.40-48
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• 2015

In this paper, battery charging and discharging circuit with a single voltage power supply is proposed. The proposed circuit has the separated current path and charging-monitoring sequence control scheme. In the charging sequence, the proposed 2-level comparator combined with control signal of the micro-processor can control the constant charging current to protect the over current of the battery. Furthermore, the proposed circuit uses a periodic main power switch control to detect the discharging characteristics to estimate the approximated battery life-time. In the experiments, the proposed emergency power supply for emergency call system has 89% efficiency with 98% power factor. And the proposed sequence control scheme is well operated in the designed emergency power system.

• KEPCO Journal on Electric Power and Energy
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• 제8권2호
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• pp.143-149
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• 2022

As ESS safety issues increase recently, there is a need to more precisely monitor the temperature of the ESS. In this paper, DTS technology for temperature monitoring of ESS batteries is introduced and the temperature measurement principle is explained. The temperature of the battery module is measured using the DTS system, and the thermal deviation between battery cells inside the battery module is analyzed. In order to analyze how thermal imbalance affects the charging and discharging performance of the battery, an accelerated degradation test was conducted. Cycle life characteristics analysis, battery surface temperature change, and AC impedance characteristics were conducted to analyze how the performance of battery cells differs according to temperature conditions.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.693-694
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• 2015

While urban regeneration projects are currently under active execution in several old cities in Korea, there are few projects to improve the quality of life of rural communities. Considering the decline of the SOC system, deterioration of housing, and degeneration of economic feasibility, the purpose of this study is to provide solutions to realize an improved economic and social environment of rural communities through an integrated management system for traffic safety and water management systems. Therefore, this research used an Entity-Relationship Diagram to construct an integrated system for traffic safety and water management systems for Chungcheong rural communities. The ERD is prepared by depicting 7 relationships for 13 entities, including traffic accidents and agricultural products, and 26 attributes, including soil moisture and underflow storage. Consequently, it will be possible to set up a decision-making support system that can analyze and evaluate the regeneration index, technology, and management of the systems for Chungcheong rural communities, based on supplier and user perspectives

• 한국산업보건학회지
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• 제19권2호
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• pp.102-112
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• 2009

The greatest concern of vapor/gas respirators is when to exchange chemical cartridges, but it is very difficult to estimate the breakthrough time of them in the workplace spot due to so many factors influencing on breakthrough. There needs to study on estimating cartridge exchange period available practically in the spot, even if it is not precise. In the previous study, authors suggested the method on estimating service-life of chemical cartridges using cartridges discarded after use. This followed study was to estimate exchange period for chemical cartridges using comparison of concentrations between Korean Occupational Exposure Limits (KOELs) and odor thresholds of chemicals. Chemicals were divided into four groups, I, II, III and IV groups. Group I chemicals are relatively safe if cartridges are just or slightly delayed exchanged when smelling since odor thresholds were less than 0.5 times KOELs. Odor threshold of Group II chemicals are 0.5~2.0 times KOELs and potentially hazardous if cartridges are exchanged when smelling. Those chemicals should be conducted program on estimating service-life of cartridges, which was just previously published (J Kor Soc Occup Environ Hyg 2008;18(3) 204-215). Group III chemicals (odor thresholds are more than 2.0 times KOELs) and Group IV chemicals (odorless or no data for smelling) must be performed the above mentioned program before cartridges. Even if this method on cartridge exchange using odor threshold is practically widely used in the workplace spot in the present, program on estimating service-life of cartridges is recommended for all chemicals to reduce potentially hazards.

• BMB Reports
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• 제43권1호
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• pp.34-39
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• 2010

Expression patterns of OsAREB1 revealed that expression of OsAREB1 gene can be induced by ABA, PEG and heat. Yeast one-hybrid assay demonstrated it can bind to ABA-responsive element (ABRE), which was found in most stress-induced genes. Transgenic Arabidopsis over-expressing OsAREB1 had different responses to ABA and glucose compared to wild-type plants, which suggest OsAREB1 might have a crucial role in these two signaling pathways. Further analysis indicate that OsAREB1 have multiple functions in Arabidopsis. First, OsAREB1 transgenic plants had higher resistance to drought and heat, and OsAREB1 up-regulated the ABA/stress related gene such as RD29A and RD29B. Second, it delayed plant flowering time by down-regulating the expression of flowering-related genes, such as FT, SOC1, LFY and AP1. Due to the dates, OsAREB1 may function as a positive regulator in drought/heat stresses response, but a negative regulator in flowering time in Arabidopsis.