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윤석만(Seok Mann Yoon),안덕용(Deog Yong Ahn),이창수(Chang Soo Lee),백재승(Jae Sung Paek),신찬영(Chan Young Shin),이병로(Byong Ro Lee) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
본 연구는 농업에 지역난방을 연계하여 활용함을 목적으로 테스트베드를 구축하고 운영하여 실증자료를 확보하는 것이다. 지역난방은 주로 밀집된 도시를 중심으로 운영되고 있으므로 열공급망 인근 근교농업에 활용되는 것이 합리적이다. 근교농업의 대표적인 것으로서 원예재배를 들 수 있으며, 테스트베드로써 동양난 재배 온실을 선정하였다. 선정된 온실의 전체규모는 약 5,000m2에 해당하며, 온실온도를 22 ~ 25 ℃ 정도로 유지하여 열사용량이 비교적 많은 편이다. 한편, 최근 지역난방은 신재생에너지와 연계성을 고려하고 다단 열이용까지 고려하여 공급온도를 낮추는 경향이 있다. 따라서 지역난방 공급관 및 회수관으로부터 열공급이 가능하도록 시스템을 구성하여 혼합관(공급관과 회수관) 및 회수관 단독 열공급으로 운영하였으며, 운영자료를 분석하였다. 대부분의 기간 동안 열공급은 목표온도 달성이 가능하였으며 회수관 단독 공급의 경우, 일부기간 계절에 따라 지역난방 회수온도가 과도하게 낮은 기간에 대해서는 추가적인 검토가 필요하다. 또한 테스트베드 구축 운영결과로부터의 최대 열부하값과 최대 열부하분석이 지역/온실/작물별에 의한 값과 유사한 결과를 보이는 것을 확인할 수 있었다.
지역난방-신재생에너지 하이브리드 열공급시스템 구축을 위한 열부하 및 열공급 분석
윤석만(Seok Mann Yoon),김진홍(Jin Hong Kim),김용기(Yong Ki Kim),민경천(Kyung Chon Min),이중용(Joongyong Yi) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
Recently, development of new and renewable energy technologies is becoming more important due to rising fossil fuel prices and conerns about environmental problems due to rising energy demand. In particular, when the heat generated from renewable energy sources is different from the thermal load, it should be operated so that heat storage or heat radiation operation can be performed smoothly. The purpose of this study is to calculate the system configuration and capacity through the heat load and heat supply analysis of the demand source in order to find a way to link the renewable energy hybrid heat supply system with district.
미래의 불확실한 냉방부하에 대한 아이스슬러리를 이용한 지역냉방시스템
이윤표(Yoon Pyo Lee),안영환(Young Hwan Ahn),윤석만(Seok Mann Yoon) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
A new district cooling system using ice slurry for the uncertain cooling load of the future is presented. The chilled water produced by the absorption chillers is used for the base cooling load. The temperature of the chilled water is reduced by mixing of ice slurry depending on increasing of the cooling load. Finally, IPF of the ice slurry is increased up to 10% at the peak load. The transporting mass flow rate is decreased down to 44.7%, and the diameter of the main pipe is decreased down to 66.7%, but the diameter of the branched pipe is designed as the same size of the chilled water.
요통 및 좌골신경통 환자의 치료결과 : 수면장애 및 피로감과 자각적 통증 및 장애정도의 관계
이경석,윤석만,도재원,배학근,윤일규,Lee, Kyeong-Seok,Yoon, Seok-Mann,Doh, Jae-Won,Bae, Hack-Gun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.3
Objective : Psychological factors may have a major influence on the outcome of treatment for back pain. We investigated the relationship between the outcome and some psychological factors, such as self-reported pain intensity, disability, sleep disturbance and fatigue. Method : The study was conducted as a survey using a questionnaire and telephone interviews. The survey included consecutive 294 patients who visited the neurosurgical out-patient department complaining of low back pain and contacted by telephone on average seven months after the first visit. Pain intensity was measured by visual analog scale, and disability was assessed by Waddell's chronic disability index. Results : The outcome of treatment for back pain was recovered in 36.7%, improved in 30.6%, almost same in 28.6%, and aggravated in 4.1%. Overall rate of improvement was 67.3%. The rate of improvement was related to the duration, patterns and intensity of the symptom, and Waddell index. It was not influenced by the doctors, special studies, and methods of treatment. When the duration was more than 6 months, there were the symptoms of both back and legs, and the self-reported Waddell index was 1-3, the rate of improvement was relatively low. Although the intensity of the pain and disability was closely related to the degree of sleep disturbance, fatigue, appetite, or indigestion, the outcome of treatment for back pain was not always bad in patients with high psychological stress. Actually the outcome of the patients who complained severe pain and disability was better than the outcome of the others. Conclusion : The outcome of the back pain can be predicted by the duration, patterns and intensity of the symptom, and Waddell index. The multidisciplinary treatment will be necessary for the patients whose expected outcome is not good to reduce not only the physical symptoms but also the psychological stress.
경막하 수외로 전이된 척수암 1례 - 증 례 보 고 -
신일영,도재원,윤석만,이경석,배학근,윤일규,최순관,변박장,Shin, Il-Young,Doh, Jae-Won,Yoon, Seok-Mann,Lee, Kyeong-Seok,Bae, Hack-Gun,Yun, Il-Gyu,Choi, Soon-Kwan,Byun, Bark-Jang 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.8
Spinal intradural extramedullary metastasis are very rare. The authors report a case of spinal metastasis at the T5 level in the intradural extramedullary space in a 76-year-old man who presented with paraparesis and sciatica. Preoper-ative neuroradiologic imaging studies were highly suggestive of intradural mass lesion with compressive myelopathy. Pathology revealed metastatic squamous cell carcinoma. We describle the mechanism of tumor spread in intradural spinal metastasis.
이경석,도재원,윤석만,배학근,윤일규,Lee, Kyeong-Seok,Doh, Jae-Won,Yoon, Seok-Mann,Bae, Hack-Gun,Yun, Il-Gyu 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.7
Objective : Traumatic disc lesion is a lesion with tremendous controversies. The causal relationships of this lesion are not established along with pathogenesis, diagnostic criteria, methods of treatment and the outcome. However, a significant number of patients with back pain after a trauma underwent spinal operations under the diagnosis of traumatic disc lesions. Such an ill-directed operation eventually produce a person with an iatrogenic disability. We present two illustrative cases, and tried to make a preventive method. Methods : We examined the path from mild trauma after a road traffic accident into the iatrogenic disability in two illustrative cases, who requested disability assessment and medical appraisement. We evaluated the reason and background for such an unwanted outcome and tried to find a method to reduce or prevent it by a literature review. Results : These two patients were admitted to the hospital with the diagnosis of lumbar sprain after a road traffic accidents. They eventually underwent spinal surgery under another diagnosis such as traumatic disc herniation or internal disc disruption. They stayed at the hospital for more than six months and finally lost their jobs. They became the disabled at last. Although they complained back pain, they never insisted by themselves that their symptoms were due to the traumatic disc lesion. To prevent such an iatrogenic disability, the doctors should assist them to go-back to the workplace promptly instead of a reckless extension of the treatment period. It may be necessary to evaluate the certificates to extend the treatment period with an additional diagnosis by a medical expert. To reduce the unnecessary long-term admission, a new billing system such as a partial share for the high cost of the treatment by the patients may be needed. Conclusion : It is not the patient but the doctors, who has the responsibility to avoid the unnecessary operations. All treating doctors should try to reduce or prevent such an iatrogenic complication caused by ourselves before we are forced to do so.