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과일폐기물을 이용한 DEFC용 바이오에탄올 제조 및 특성에 관한 연구
이남진,김현수,차인수,최정식 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.2
This study discribes performance of DEFC (Direct Ethanol Fuel Cell) utilized bio-ethanol based on fruit wastes. To produce the bio-ethanol, fruit wastes were treated at temperature 120℃ and 90minutes in acid pre-treatment. After pre-treatment was done, alcohol fermentation process was running. Initial alcohol concentration was 5%. Using the multi coloumn distillation system, more than 95% ethanol was distilled and each component of bio-ethanol was analyzed. In DEFC performance test, it was revealed that cell performance was much higher than that of ethanol. Comparing ethanol with mixed fuel (bio-ethanol (10%)+ ethanol (90%)), the performance of ethanol was higher than that of mixed fuel. Even though the bio-ethanol from the fruit wastes is corresponded with transport ethanol standards, it thought that organic matter in bio-ethanol could be negative effect on fuel cell.
이남진,문준동 사단법인 한국응급구조학회 2020 한국응급구조학회지 Vol.24 No.2
Purpose: Stroke is a time-sensitive disease that could have reduced complications and mortality with timely diagnosis and treatment. This study aimed to analyze the causes of delay in detecting the clinical signs and symptoms of stroke. Methods: This retrospective observational study analyzed the emergency medical services reports of suspected stroke patients with positive predictive values on the Cincinnati Prehospital Stroke Scale. The study was conducted in Daejeon, Republic of Korea from January 1, 2016 through December 31, 2017. Results: Prolonged prehospital time was associated with high blood pressure, history of cerebrovascular disease, and incidences during daily activities, and sleep. High blood pressure and complications from a previous stroke strongly associated with the prolonged stroke-detection phase (p<.05). Total prehospital time was shortened when patients had evident stroke symptoms, such as decreased level of consciousness, dysarthria, and hemiplegia (p<.05). There was no significant difference in gender or age as a factor that delayed the total prehospital time of the suspected stroke patients. Conclusion: Many patients did not recognize the early clinical symptoms and signs of a stroke. Furthermore, risk factors, such as high blood pressure and history of stroke, prolonged the total prehospital time. Therefore, we need targeted interventions that educate about warning symptoms of stroke, along with emphasis on the importance of emergency calls to substantially reduce the prehospital delays.
Sliding Mode Control for Wheel Slide Protection in Railway Vehicles with Pneumatic Brake Systems
이남진,강철구 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3
Railway vehicles are the most commonly used means of public transportation systems, and therefore, it is essential to ensure their safe operation. To ensure reliable brake performance even on impaired tracks, a wheel slide protection device (WSP) is fitted to the brake system to prevent the wheels from locking and thus reduce excessive sliding. In this study, a sliding mode control (SMC) algorithm for a pneumatic brake system is proposed. The proposed algorithm basically conforms to SMC theory and the sampling time is divided into three sections, namely, the command section, response section, and monitoring section. The SMC determines the duty time for the WSP valve command, operates on a limited command section, and then waits for the brake state to stabilize through the response section. The benefits of this control strategy are that it can use a simplified mathematical model of a pneumatic valve on the model-based SMC and modify the continuous command type for the WSP valve instead of a discrete mode command. The proposed algorithm was verified through experiments with a brake hardware-in-the-loop simulation system for a railway vehicle.
이남진,정애자,황익근,Lee, Nam-Jin,Jung, Ae-Ja,Hwang, Ik-Keun 한국정신신체의학회 1999 정신신체의학 Vol.7 No.1
감정표현불능증은 감정과 공상을 언어적으로 표현하는 능력의 어려움을 특징으로 하는 정신기능의 특정 장애를 의미한다. 이는 초기에 정신신체질환에서 언급되었음에도 불구하고 감정표현불능증적 특성은 내과적 그리고 정신과적장애를 가진 환자들에게서 폭 넓게 관찰되고 있다. 본 연구는 Scored Archetypal 9 Test(SAT9)파 한국판 토론토 감정표현불능증 척도-20(TAS-20K)를 사용하여 알코올리즘 환자들에서의 감정표현불능증적 특성을 조사하기 위해 계획되었다. 20명의 알코올리즘 환자들과 24명의 정상대조군이 본 연구를 수행하였다. 결과는 다음과 같다. 1) SAT9과 TAS-20K에서 알코올리즘 환자군은 정상대조군에 비하여 좀 더 alexithymic하였다. 2) 두 군간 성별사이의 감정표현불능증 척도는 통계학적으로 유의한 차이가 없었다. 3) 두 군간 나이나 교육정도와 감정표현불능증 척도사이에는 통계학적으로 유의한 상관은 없었다. 4) SAT9과 TAS-20K은 환자군에서 통계학적으로 유의한 상관을 보여주었다. Alexithymia refers to a specific disturbance in psychic functioning characterized by difficulties in the capacity to verbalize affect and to elabolate fantasies. Although it was initially described in the context of psychosomatic illness, alexithymic charateristics may be observed in patients with a wide range of medical and psychiatric disorders. This study was designed to investigate alexithymic characteristics in the patients with alcoholism using Scored Archetypal 9 Test(SAT9) and Toronto Alexithymia Scale-20 Korea version(TAS-20K). Twenty patients with alcoholism and twenty-four normal controls completed these tests. The results were as follows. 1) Patient group with alcoholism were significantly more alexithymic than normal control group in both SAT9 and TAS-20K. 2) No significant difference in the alexithymic measures was found between genders of both group. 3) No significant correlation was found between alexithymic measures and age or education level in both group. 4) Measures between SAT9 and TAS-20K showed significant correlation in the patient group.