• Journal of Advanced Marine Engineering and Technology
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• v.29 no.7
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• pp.713-721
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• 2005

A marine diesel engine should realize optimal operation efficiency while reducing NOx, PM (Particulate Matters) and other emissions. Fuel injection systems that use electronic control can become an effective means of achieving that objective. However. it still needs some accurate and instant information in order to bring its ability into full potential while sailing on the sea. The important information of them are a shaft torque and continuous combustion pressures of all cylinders. The shaft torque and the propeller thrust described in this paper are measured at an intermediate shaft by using a unique principle that one of two electromagnet coils oscillates a vibrating strip which the length changes with force and the other coil picks up the change of the frequency of the vibrating strip. For further reference, the shaft power meter multiplied the torque by the shaft revolution has already had about 750 sets of sales performance. The research presented in this paper started about ten years ago and is concerned with the development of a combustion pressure sensor that uses the same principle. Recently, the pressure sensor which bears continuous operation has been developed after a hard struggle, that is, the system that consists of a shaft horsepower meter, a propeller thrust meter and a combustion pressure sensor has been completed and has been shown to be reliable. This paper describes the configuration of this system, the material of the combustion pressure sensor, the principle of that, and the improving point of the sensor, and, we finally consider the use of this system.

• Toxicological Research
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• v.11 no.1
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• pp.15-21
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• 1995

Several populations of lymphocytes possess receptors for autonomic neurotransmitter, which make lymphocytes susceptible to autonomic stimulation. This study was to evaluate the functional alternation of effector cells of the immune system. Female Balb/C mice, 15-20 g, were injected with MA subcutaneously under various conditions. Mixed lymphocyte reaction (MLR) showed certain T cell subsets were affected by MA. The level of interleukin-2 (IL-2) production was inhibited due to a defect in expression of the IL-2 receptor. In mice injected with 20 mg MA/kg, 1 day before assay, phagocytosis of peritoneal macrophages showed $14.07\pm3%$, which was similar degree to 5 mg MA/kg treatment for 4 consecutive days. Phagocytosis was almost recovered to that of control after 4 day in 20 mg/kg injected mice. Maximum inhibition of plaque forming cell (PFC) occurred when MA was given early, indicating the inductive time point of antibody production was affected. The cortisol level increased in the MA treated group (0.05, 0.20, and $0.08{\mu}g$/dl for control, low, and high dose-MA treated mice, respectively). Based on these results, MA has general suppression effects on the immune systems by functional alteration of effector cells. Considering the increment of serum cortisol levels, MA partially impacts the neuroendocrine system to lead to failure of immune response.

• Archives of Plastic Surgery
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• v.37 no.2
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• pp.191-194
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• 2010

Treatments of severely incurved toenails cause anatomical changes and cosmetic problems, even though they provide adequate symptom relief. Incurved toenail patients treated with a K-D$^{(R)}$ (S&C Biotech, Seoul, South Korea) the new device for correcting curved nail deformity were investigated retrospectively. This study surveyed 12 patients(18 cases) who had been treated for severe ingrown toenails using K-D$^{(R)}$ from May 2008 to March 2009, and examined their subjective satisfaction before and after the treatment. The average age of the participants was 39 (ranging from 27 to 52), and 8 of them were male and 4 female. The treatment was applied after the patients were given a thorough explanation about the tool and the treatment, and questionnaire surveys were conducted before the treatment and after 3 months on the average from the treatment. In the survey, the respondents were asked about pain, restriction on activities, and the selection of shoes. For each item, symptoms with a given point were presented, and the respondents' scores were compared between the surveys before and after the treatment. According to the results of the questionnaire survey, pain increased from 14 out of 40 before the treatment to 39 after, activity restriction increased from 11 to 30, and shoe selection increased from 20 to 30. The average total score increased from 45 to 98, and this suggests a considerable enhancement in the patients' subjective satisfaction. The average period of the application of K-D$^{(R)}$ was $20.3{\pm}9.4$ days, and in all the cases, ingrown toenails were corrected within three weeks.

• Nutritional Sciences
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• v.6 no.1
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• pp.53-66
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• 2003

This study was performed to assess the perception and need for the elderly meal service program of the Korean elderly. The purpose of this study was to assess the dietary environment factors which are related to the perception and need for such service. Subjects of this study were 800 elderly persons of whom responses were received from 769(male: 26, female: 543) aged over 60 years. Their mean age was 7.51 $\pm$8.1 years. Seventy two point two percent of them lived with their family and 54.5% of them were supported economically by their children. Among their meal management behaviors, food purchasing was hard to perform and the most aid-needed activity. In their dietary environment, 47.1% of them were supported by their children. The percent of the subjects who were aware of the elderly meal service program was 48.4%. Men were more aware of the meal service program than women(p<0.01). Elderly who were supported by government were more aware of this service than others. Elderly who were in poor dietary environment, were less affluent or had trouble preparing meals expressed better perception this service than others (p<0.05). Those who requested meal services had poor dietary environment than those who did not (p<0.001). The elderly who were younger, with higher income, and lived with a spouse had more demand for home delivered meal service. This study showed that the poorer the greater desire for meal services. Therefore, the need for urgent improvement and expansion of meal services for elderly is suggested by this study.

• The Journal of Korean Medicine
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• v.26 no.2 s.62
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• pp.25-31
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• 2005

Objectives: This study was designed to assess traditional Korean medical therapy for urticaria and establish a clinical assessment guideline. Methods: Duration of symptoms, personal and family history of allergic diseases, serum IgE level, suspected causes and Provocation factors were investigated in 56 patients. Frequency of wheals, duration of wheals, number of wheals, itch severity and antihistamine counts on a 6-point (0-5) scale were assessed in 34 patients. The change of total scores and each criterion between baseline and follow up were analyzed using paired t-test (p<0.05). Results: 1. Acute urticaria within 6 weeks was $26.8\%$ and chronic urticaria over 6 weeks was $73.2\%$. The mean duration of symptoms was $19.2\pm38.8$ months. 2. $57.1\%$ of patients had a personal history of allergic diseases and $50\%$had a family history. $29.1\%$ had over 200 IU/mL serum IgE level. 3. The suspected causes were none $(39.3\%)$, foods $(32.1\%)$, drugs $(12.5\%)$, contact $(5.4\%)$ and maternity$(5.4\%)$. 4. The suspected provocation factors were foods $(41.1\%)$, none $(26.8\%)$, fatigue $(12.5\%)$, heat and sweating $(12.5\%)$, pressure $(10,7\%)$ and stress $(7.1\%)$. 5. The total scores between baseline and follow up of 34 patients were lowered from $15.38^{\circ}\;{\ae}3.75\;to\;8.82^{\circ}\;{\ae}5.21$, which was significant statistically (p=0.000). 6. Itch severity, frequency of wheals and number of wheals were the most significantly lowered of all criteria. Conclusions: Traditional Korean medical therapy was proven to be effective for urticaria, while itch severity, frequency of wheals and number of wheals should be assessed clinically with greater priority.

• Korean Journal of Community Nutrition
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• v.5 no.1
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• pp.74-82
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• 2000

This study was designed to determine the attitude and degree of satisfaction of recipients toward the meal service program for elderly people. Nine hundred and eight elderly people(male: 301, female: 607) were interviewed by trained personnel. The results were as follows. Forty two percent of them had no income and 43.8% of the respondents were supported economically by the government. Their main reasons for attending the free congregated meal program was economic hardship(37.9%) The channels of becoming aware of the free meal program were through their friends(33.4%) and the meal service centers were located in the respondents residence area(36.0%) Thus any other advertisement from local government of official channels about the free meal program were not effective for the elderly 26.9% of the respondents felt inconvenience in visiting the meal service centers because they had some difficulty in walking, 53.5% of them however answered that they didn t have any complains and were quite satisfied with the meal service. The average satisfaction score for the free meal service was 63.4(maximum score 75) As for each evaluation item respondents were highly satisfied with volunteers attitude in meal serving(4.58$\pm$0.65: maximum 5 point) The evaluation score of females was generally lower than that of males(p<0.05) Oncemore, respondents who were in lowere socio-economic classes were marked by having significantly lower satisfaction scores for the meal service compared with higher scocio-economic classes. For the welfare of elderly people, meal service programs should be extended to more elderly persons and developed considering the elderlys ecological factors.

• Journal of Biosystems Engineering
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• v.35 no.5
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• pp.310-315
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• 2010

The amount of salt intake of Korean people is 11.4 grams per a day, which is 2.3 times of the recommended daily salt intake by WHO - 5 grams of salt a day. The relationship between high salt consumption and increased risk of high blood pressure, observed not only in hypertensive but also in normotensive patients. High salt intake is also associated with an increased risk of heart attack, cerebral ischemia and osteoporosis. Therefore, this research is for developing a salt taste sensor to reduce sodium consumption and improve meal habits for the perception of a more bland taste of most foods. When the sensor was put into food sample, current intensity achieved with distribution cables. Current intensity was correlate with a simple equivalent of salt taste stimulus intensity. The salt taste sensor consists of salinity & temperature measuring probe, signal processing circuit and LCD display & LED warning light. When salinity is going over a set point, LCD displayer indicate salt taste on LCD panel by percent value (%), and at the same time, blue LED light change to red LED light. So we could know the grade of salt taste in soup before meals conveniently and objectively. The results show that operating range of 10 to $80^{\circ}C$ and accuracy of ${\pm}0.1%$ were achieved with an analysis time of about 2 or 3 sec. Moderate reductions in salt intake can help to avert adult diseases and lead a healthy life.

• CELLMED
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• v.5 no.1
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• pp.5.1-5.5
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• 2015

In this first double-blind-placebo-controlled investigation of the Aeon Patch, electrocardiographic data were acquired from 50 well-hydrated volunteers [21 females and 29 males, age: 19-79, weight: 117-334 lbs, height: 5'-6',3"], under 3 different conditions for a total duration of 15 min (5 min/condition). Condition1: Control (C) - while wearing no Patch, Condition 2: Placebo (P) or Active (A) - after wearing either the Placebo or the Aeon Patch for 20 min, and Condition 3: Active (A) or Placebo (P) - after wearing either the Aeon or the Placebo Patch for 20 min. There was a washout period of 15 min between Conditions 2 and 3. All involved in the investigation were blind to the (A) and (P) Patches as they looked exactly the same and were assigned in a random fashion. The hypothesis to be tested was: Wearing the Aeon Patch for 20 min reduces stress. Data were first quality assured and those subjects who showed a parasympathetic response after wearing the Patch within 20 min were identified as early responders. Thirty subjects (60%) achieved a relaxed state after wearing the Aeon Patch as early as 20 min. Statistical analysis (one-sample inference) was used to compare the spectral features of the responders. The normalized LF/HF decreased significantly ($24%{\pm}9%$ after 20 min) in condition (A) compared to condition (P) with a p-value < 0.047 (n = 30) in responders. Therefore, the hypothesis that wearing the Aeon Patch for 20 min reduces stress was accepted as true.

• The Korean Journal of Pain
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• v.23 no.3
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• pp.190-197
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• 2010

Background: Conventional spinal saddle block is performed with the patient in a sitting position, keeping the patient sitting for between 3 to 10 min after injection of a drug. This amount of time, however, is long enough to cause prolonged postoperative urinary retention. The trend in this block is to lower the dose of local anesthetics, providing a selective segmental block; however, an optimal dose and method are needed for adequate anesthesia in variable situations. Therefore, in this study, we evaluated the question of whether only 1 min of sitting after drug injection would be sufficient and safe for minor anorectal surgery. Methods: Two hundred and sixteen patients undergoing minor anorectal surgery under spinal anesthesia remained sitting for 1 min after completion of subarachnoid administration of 1 ml of a 0.5% hyperbaric bupivacaine solution (5 mg). They were then placed in the jack-knife position. After surgery, analgesia levels were assessed using loss of cold sensation in the supine position. The next day, urination and 11-point numeric rating scale (NRS) for postoperative pain were assessed. Results: None of the patients required additional analgesics during surgical manipulation. Postoperative sensory levels were T10 [T8-T12] in patients, and no significant differences were observed between sex (P = 0.857), height (P = 0.065), obesity (P = 0.873), or age (P = 0.138). Urinary retention developed in only 7 patients (3.2%). In this group, NRS was $5.0{\pm}2.4$ (P = 0.014). Conclusions: The one-minute sitting position for spinal saddle block before the jack-knife position is a safe method for use with minor anorectal surgery and can reduce development of postoperative urinary retention.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.12
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• pp.1013-1020
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• 2017

In this study, the failure prediction of composite laminates under flexural loading is investigated. A FEA(finite element analysis) using 2D strain-based interactive failure theory. A pregressive failure analysis was applied to FEA for stiffness degradation with failure mode each layer. A three-point bending test based on the ASTM D790 are performed for cross-ply $[0/90]_8$ and quasi-isotropic $[0/{\pm}45/90]_{2s}$ laminated composites. The accuracy of the applied failure theory is verified with the experimental results and other failure criteria such as maximum strain, maximum stress and Tsai-Wu theories.