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정상협(Sanghyup Jung) 대한생물치료정신의학회 2022 생물치료정신의학 Vol.28 No.2
Spinal cord injury is a devastating condition in which motor, sensory, and autonomic nerve functions are impaired due to traumatic or non-traumatic causes on the spinal cord. Patients with spinal cord injuries may experience paralysis caused by nerve damage secondary to various physical complications such as pain, spasticity, neurogenic bladder, neurogenic bowel, pressure ulcer, and sexual dysfunction. These physical symptoms of patients with spinal cord injuries bring about psychological difficulties, ranging from emotional reactions such as sadness and feelings of low self-esteem to depression, anxiety, sleep disorders, and suicidal tendencies. Conversely, mental health problems in patients with spinal cord injuries can also have negative effects on physical complications such as neuropathic pain and pressure ulcers, as well as rehabilitation therapy and prognosis. In other words, the physical and psychiatric symptoms of a patient with spinal cord injury bidirectionally influence each other. Existing medical approaches focus only on the physical rehabilitation of patients with spinal cord injuries and do not recognize these patients’ need for mental health support. Therefore, screening, evaluation, and appropriate management for psychiatric problems such as depression, anxiety, sleep disorders, and suicidal tendencies in clinical practice are required, which may ultimately benefit the quality of life and prognosis of patients with spinal cord injuries.
Choi Jung-In,Jung Sanghyup,Oh Gyu Han,Son Kyung-Lak,Kwang-Min Lee,Jung Dooyoung,Kim Tae-Yong,Im Seock-Ah,Lee Kyung-Hun,Min-Sup Shin,Hahm Bong-Jin,염찬우 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.11
Objective Pre-treatment anxiety (PA) before chemotherapy increases complaints of chemotherapy-related symptoms (CRS). The results on the association have been inconsistent, and the effect of temperament remains unclear. We aimed to determine whether PA is a risk factor for CRS and the effect of differing temperaments on CRS.Methods This prospective study comprised 176 breast cancer patients awaiting adjuvant chemotherapy post-surgery. We assessed CRS, PA, and temperament using the MD Anderson Symptom Inventory (MDASI), the Hospital Anxiety and Depression Scale, and the short form of the Temperament and Character Inventory-Revised, respectively. The MDASI was re-administered three weeks after the first chemo-cycle.Results PA showed weak positive correlation with several CRS after the first cycle; no CRS was significantly associated with PA when pre-treatment depressive symptoms and baseline CRS were adjusted in multiple regression analysis. Moderation model analysis indicated that the PA effect on several CRS, including pain, insomnia, anorexia, dry mouth, and vomiting, was moderated by harm avoidance (HA) but not by other temperament dimensions. In particular, PA was positively associated with CRS in patients with low HA.Conclusion The results in patients with low HA indicate that more attention to PA in patients with confident and optimistic temperaments is necessary.
Sanghyup Lee,신경호,Jun-Su Lee,이태진,Da-Min Sim,정동수,Hoon Jung,Joo-Hyung Kim 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
In this review work, energy harvesting methods for waste heat with small temperature differences between heat source and sink are discussed. At present, many methods are tried and employed to utilize this type of waste heat. A typical example is found in a conventional power generation system. By utilizing this type of waste heat, additional energy can be produced in regular power generation systems. Up to this point, two energy harvesting methods have been introduced and applied for the use with this type of waste heat. One is a method using an organic Rankine cycle (ORC) while the other is a method using a thermoelectric generation (TEG). An ORC is a Rankine cycle that can be applied to this type of waste heat using organic fluids such as refrigerants as working fluids instead of water used in a typical Ranking cycle. On the other hand, a TEG utilizes Peltier, Seebeck, and Thomson effects caused by the temperature difference between the heat source and sink for energy harvesting. In this work, various aspects associated with the use ORC and TEG for waste heat harvesting with small temperature differences between the heat source and sink.
Experimental Study on Combined Ocean Thermal Energy Conversion with Waste Heat of Power Plant
Jung, Hoon,Jo, Jongyoung,Chang, Junsung,Lee, Sanghyup Korea Electric Power Corporation 2019 KEPCO Journal on electric power and energy Vol.5 No.3
This work is experimental study of 10 kW specialized Combined Ocean Thermal Energy Conversion. We propose a C-OTEC technology that directly uses exhaust thermal energy from power station condensers to heat the working fluid (R134a), and tests the feasibility of such power station by designing, manufacturing, installing, and operating a 10 kW-pilot facility. Power generation status was monitored by using exhaust thermal energy from an existing power plant located on the east coast of the Korean peninsula, heat exchange with 300 kW of heat capacity, and a turbine, which can exceed enthalpy efficiency of 45%. Output of 8.5 kW at efficiency of 3.5% was monitored when the condenser temperature and seawater temperature are $29^{\circ}C$ and $7.5^{\circ}C$, respectively. The evaluation of the impact of large-capacity C-OTEC technology on power station confirmed the increased value of the technology on existing power generating equipment by improving output value and reducing hot waste water. Through the research result, the technical possibility of C-OTEC has been confirmed, and it is being conducted at 200 kW-class to gain economic feasibility. Based on the results, authors present an empirical study result on the 200 kW C-OTEC design and review the impact on power plant.
흑산도 내연 디젤발전기 엔진폐열 이용 ORC 시스템 실증 연구
이상협(Sanghyup Lee),정훈(Hoon Jung) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The island uses diesel-power-generation inevitably for its geographical characteristics. It is not economical and more than half of the generated energy is released to the exhaust gas, cooling water and other losses. In order to reduce these losses and improve power generation efficiency, we are studying an organic rankine cycle system using waste heat from a diesel power plant as a heat source. Unlike previous rankine cycle, electric power generation and operation are possible by using the low heat source and capacity. Cycle design and demonstration-operation logic are required to proper the range of waste heat temperature and capacity. Also, depending on the efficiency of each component, the overall efficiency may change greatly, so it requires to optimize of operating conditions of various BOP. It is necessary to establish optimization and operating conditions of the system for each element with modeling and numerical study of the whole system. In this research, heat source analysis and BOP design were carried out in order to apply the 20 kw / 30 kw ORC system to Heuksan island 1MW-diesel power plant. We have developed a heat-connecting technique that thermally connects the heat exhaust piping at the final end and the evaporator of the ORC system. The demonstration experiment is conducted sharing the waste heat source with 20 kW and 30 kW ORC system. In this paper, we presented the waste heat analysis and the demonstration operation result of Heuksan island power plant.