• 동의생리병리학회지
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• 제25권1호
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• pp.19-28
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• 2011

More than 30,000 Wooden Slips were excavated in the Juyan region in 1930s and 1970s. These slips recorded military actions of Juyan Frontier Fortress during Han dynasty, which is about BC 100 ~ AD 30. On the slips, there are many disease names and symptoms mentioned. We focused on a certain disease name, namely, Shnaghan(傷寒; injured by cold), which is the main subject of Shangha-lun(傷寒論). Looking closely into these Juan Wooden Slips, we found many articles recording Shanghan, including related diseases and symptoms, such as Shanghan(傷汗; injured by sweat), headache, fever and chills, immobilization of limbs, unacceptance of foods. And there are another Shanghan-related symptoms, such as inflation of upper-abdomen(心腹支滿), pain of upper abdomen(心腹痛), strain of both armpits(兩胠葥急), inflation of chest(胸脇支滿), tightness and fear in the chest(煩滿). Although they have no direct relationship with Shanghan, there are many symptoms, including the external wounds of waist, finger, thigh, back, breast and head, abscess of leg and elbow, sore throat, itching, leucorrhea, powerlessness of hands and legs(手足癃), visceral injury(傷臟), tinnitus, cold, warm and heat. Because the Wooden Slips are very short, with some characters even missing, we can not confirm the detail of the disease and symptoms. In addition, we will report about the herbal medicines and other treatments, which are recorded on the slips, by further research.

• 한국구조물진단유지관리공학회 논문집
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• 제22권6호
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• pp.176-181
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• 2018

콘크리트 구조물은 시공 후 다양한 원인에 의해 물리적, 화학적 변형을 통해 물리적인 성능이 저하된다. 이러한 콘크리트 구조물의 성능저하는 사용수명을 감소하기 때문에 합리적인 보수보강이 필요하다. 최근 콘크리트 구조물의 효율적인 보수을 위해, 부착성능을 향상시킨 하이브리드 보수재료에 대한 연구가 활발히 수행되어오고 있다. 본 연구에서는 기존콘크리트와의 부착성능 및 수밀성을 향상시키기 위해 초속경 시멘트에 PVA 분말수지, 나일론 섬유, 라텍스를 혼입 한 하이브리드 보수재를 개발하였다. 보수재료의 성능평가를 위해 압축강도, 건조수축, 부착강도 실험을 수행하였다. 또한 미리 손상이 발생한 시험체를 제작한 후 보수 전후의 휨부착 성능평가를 수행하였다. 휨강도 평가결과, 기존의 초속경시멘트만 혼입한 시험체를 제외한 모든 실험체에서 110%~150%정도 휨강도가 크게 나타났고, 휨강도에 의해 발생된 균열패턴은 모든 실험체가 기존 콘크리트와 일체 거동하는 것으로 나타났다.

• 한국의류학회지
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• 제31권3호
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• pp.343-350
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• 2007

This study compared and studied the clothing mobility of two types of aerobic clothes - those made of currently popular stretch materials and those made of new stretch materials that were specially developed for this study. The focus of the comparison was on the range of joint movement during activity, and the physiological burden imposed on the body by the clothes. In total, 18 experiments were carried out under controlled conditions in an artificial climatic chamber with a temperature of $25{\pm}1^{\circ}C$, air humidity of $60{\pm}5^{\circ}C$ and negligible air movement. Each exercise program consisted of a 30-minute of aerobic workout and a 20-minute rest following the exercise. Measurements were taken to determine the following: physiological reactions (whole-body and local sweat rates), subjective sensations(of temperature, humidity, comfort, tightness, and clothing wetness), joint angle(measured with a goniometer), and so on. The results of the study us as follows: Material B excels in clothing mobility. Material C excels in sweat absorbency and drying speed. Material A was found to be the hottest material, while material C was found to be slightly hot through the analysis of the change in pre- and post-exercise bodyweight(= amount of sweat). Regarding the amount of evaporated sweat, material A>material C>material B. Material B produced the smallest amount of evaporated sweat. The wider the range of joint movement, the smaller the amount of sweat and the lower the average skin temperature.

• 한국염색가공학회지
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• 제32권3호
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• pp.176-183
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• 2020

In order to study wearable air cushion materials capable of responding to massive impact in high-altitude fall situation, high tenacity woven fabrics were bonded by heat only depending on various type of thermoplastic films and then mechanical properties were measured. Tensile strength, elongation, and 100% modulus measurement results for 4 types of films show that TPU-2 has higher impact resistance and easier expansion than PET-1. After thermal bonding, the combination with the highest tensile strength was a material with a TPU-2 film for nylon and a PET-2 film for PET, so there was a difference by type of fabric. The tear strength of the bonded materials were increased compared to the fabric alone, which shows that durability against damage such as tearing can be obtained through film adhesion. All of the peel strengths exceeded the values required by automobile airbags by about 5 times, and the TPU-2 bonded fabric showed the highest value. The air permeability was 0 L/dm2 /min. For both the film and the bonded material, which means tightness between the fabric and the film through thermal bonding. It is expected to be applied as a wearable air cushion material by achieving a level of mechanical properties similar to or superior to that of automobile airbags through the method of bonding film and fabric by thermal bonding.

• Nuclear Engineering and Technology
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• 제48권2호
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• pp.533-544
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• 2016

This paper provides a reference to determine the seal performance of metallic O-rings for a reactor pressure vessel (RPV). A nonlinear elastic-plastic model of an O-ring was constructed by the finite element method to analyze its intrinsic properties. It is also validated by experiments on scaled samples. The effects of the compression ratio, the geometrical parameters of the O-ring, and the structure parameters of the groove on the flange are discussed in detail. The results showed that the numerical analysis of the O-ring agrees well with the experimental data, the compression ratio has an important role in the distribution and magnitude of contact stress, and a suitable gap between the sidewall and groove can improve the sealing capability of the O-ring. After the optimization of the sealing structure, some key parameters of the O-ring (i.e., compression ratio, cross-section diameter, wall thickness, sidewall gap) have been recommended for application in megakilowatt class nuclear power plants. Furthermore, air tightness and thermal cycling tests were performed to verify the rationality of the finite element method and to reliably evaluate the sealing performance of a RPV.

• 대한통합의학회지
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• 제9권2호
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• pp.105-108
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• 2021

Background : Hyperornithinemia-hyperammonemia-homocitrullinuria (HHH) syndrome is a rare, autosomal recessive metabolic disorder which is caused by genetic mutations that disrupt the urea cycle. It is characterized by variable clinical presentation and the age of onset. Patients may present with gait disturbance and progressive paraplegia and muscle tightness in the lower extremities. The use of botulinum toxin in metabolic disease has rarely been discussed. We describe a case of a 14-year-old-boy with HHH syndrome, who presented with a several - month history of gait disturbance and lower extremity weakness. Case presentation : A 14-year old male had a history of recurrent upper respiratory tract infections, occasional vomiting, loss of appetite, and general weakness, all of which started since he was 10 months old. He was diagnosed with HHH syndrome at one year of age. At the age of 14, he was referred for the assessment and treatment of his gait disturbance and aggravated weakness of the lower extremities. Brain MRI, electrodiagnostic study and blood test were performed to exclude any lesions related to neurologic dysfunction. Botulinum toxin type A were injected into muscles of adductor longus, adductor magnus, lateral and medial hamstring, and lateral and medial gastrocnemius muscle heads under needle electromyography guidance to reduce lower limb spasticity. Intensive physical therapy including gait training and stretching exercise of adductor and calf muscles were also provided. After intensive physical therapy and botulinum toxin injection to reduce lower limb spasticity, he was able to ambulate for 20 meters independently without any walking aids. There were no adverse events after the injection. Conclusion : Botulinum toxin injection is a safe and effective therapy for patients with HHH syndrome who suffer from gait disturbance.

• 한국가스학회지
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• 제25권2호
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• pp.52-63
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• 2021

제조업 작업자들에 대한 위험행동 요인의 분석은 효과적인 휴먼에러 예방과 효율적인 안전관리제도의 시스템화를 가능하게 한다. 본 연구는 작업자들의 작업심리, 작업환경, 작업일탈 요인이 위험행동의도에 미치는 영향과 이러한 위험행동의도가 위험행동에 미치는 영향의 관계를, 중소 제조업 중 제조가공업 작업자 80명을 대상으로, 설문조사를 중심으로 분석하였다. 결과를 살펴보면, 작업심리와 작업일탈은 위험행동의도에 영향을 미치는 것으로 나타났으나, 직무만족과 작업부하에 해당하는 작업환경요인은 위험행동의도에 영향을 미치지 않는 것으로 나타났다. 동료들과의 관계, 업무의 만족 내지는 불만족 정도, 작업자가 느끼는 직무의 중요성 정도와 많은 작업량을 소화하기 위한 시간의 촉박함 등이 의도적인 위험 작업 유발에는 영향을 미치지 않지만, 위험행동에는 영향을 미치는 것으로 나타나, 의도성이 결여된 상태에서 작업환경요인은 위험행동을 수반하는 것으로 나타났다.

• 한국의사학회지
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• 제32권1호
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• pp.11-20
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• 2019

Queen Myeongseong was the wife of King Hyeonjong, the 18th king of the Joseon Dynasty, and the mother of King Sukjong. The clinical records of Queen Myeongseong are summarized on the basis of the Seungjeongwon Ilgi (The Daily Records of Royal Secretariat of Joseon Dynasty 承政院日記) and reviewed through Donguibogam. Queen Myeongseong gave birth to one male and three female children in the time of the queen. She took Geumgaedangguihwan (金櫃當歸丸), Dalsaengsan (達生散), Antaeum (安胎飮) during her pregnancy and Gungguitang (芎歸湯) during postnatal care. Since 1669, chest tightness, sleeplessness, arm pain and numbness of arms had been appeared. Ondamtang (溫膽湯) and Dodamtang (導痰湯) were used but they were not effective. However, when her symptoms were regarded as a benign tumor due to cold and wetness, there was a difference in the use of Ohjuksan (五積散). In 1683, when king Sukjong was caught in a smallpox, she took care of him. She exorcised in the middle of winter to pray for her son's recovery, and died of the flu.

• 한국수소및신에너지학회논문집
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• 제29권6호
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• pp.587-595
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• 2018

Recently, research is being conducted to use a fuel cell as a power source of unmanned aircraft. However, safety standards about applying fuel cells to unmanned aircraft are insufficient. In this paper, to improve the safety of the fuel cells for unmanned aircraft is experimentally studied. For this reason, standards for safety of fuel cells were analyzed. And influence of vibration among the evaluation items related to the safety of the fuel cell for unmanned aircraft was discussed. In order to, at constant intervals, vibration was applied to the fuel cell, then the performance was measured, the measurement items were gas tightness, polarization curve, frequency response analysis (FRA). A total of 220 hours was experimented at 20 hour intervals. the result of vibration test, gas leakage rate was a maximum of -0.04826 kPa/min and Polarization curve reached a maximum of 1.0103 times of the initial value, the charge transfer resistance reached a maximum of 1.0104 times of the initial value. This research indicate that performance of fuel cell is affected by vibration and this study is expected to contribute to the safety of fuel cell for unmanned aircraft.

• 산업경영시스템학회지
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• 제41권4호
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• pp.9-21
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• 2018

In South Korea, Jeju Island has a role as a test bed for electric vehicles (EVs). All conventional cars on the island are supposed to be replaced with EVs by 2030. Accordingly, how to effectively set up EV charging stations (EVCSs) that can charge EVs is an urgent research issue. In this paper, we present a case study on planning the locations of EVCS for Jeju Island, South Korea. The objective is to determine where EVCSs to be installed so as to balance the load of EVCSs while satisfying demands. For a public service with EVCSs by some government or non-profit organization, load balancing between EVCS locations may be one of major measures to evaluate or publicize the associated service network. Nevertheless, this measure has not been receiving much attention in the related literature. Thus, we consider the measure as a constraint and an objective in a mixed integer programming model. The model also considers the maximum allowed distance that drivers would detour to recharge their EV instead of using the shortest path to their destination. To solve the problem effectively, we develop a heuristic algorithm. With the proposed heuristic algorithm, a variety of numerical analysis is conducted to identify effects of the maximum allowed detour distance and the tightness of budget for installing EVCSs. From the analysis, we discuss the effects and draw practical implications.