• Korean Security Journal
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• no.4
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• pp.299-317
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• 2001

The United States Secret Service is the strongest presidential protective organization in the world. Almost every country's security organization in the world is benchmarking its organization, protective operation system, security equipments and etc. In this paper, I study largely on the protective operation system of the U.S Secret Chapter I is the introduction part. Chapter II introduces the establishment and the background of its development of the U.S Secret Service. Chapter III deals with the organization and ranking system of the U.S SS. Chapter IV consider the protective operation system of the 5.5. The main theory of the protective operation is the 'Protective Envelope Philosophy' which emphasizes the "Cover and Evacuate". Also the protective operation system is developed with the principle of the democracy and in the history of continuing assassination attempt against president. Chapter V describes the legal basis and missions of the S.S. Every protective operational mission of the U.S SS is peformed by the legal basis and democratic procedure. It is followed by concluding observation made in Chapter VI.

• Journal of Korean Public Health Nursing
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• v.15 no.1
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• pp.27-41
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• 2001

The purpose of this study was to discern the level of satisfaction of postpartum care in hospitals. the level of importance of traditional postpartum care and the need for home health care for postpartum women. The study's design was to obtain data needed to develop a community-based postpartum care program and to improve the quality of nursing for postpartum care recipients. Data for the study was collected from 1 March to 31 June 2000 from 116 postpartum care recipients treated in Chung-Buk, Korea. Data analysis consisted of frequency, percentage, t-test, and ANOVA. using SPSS win program. The results the of analysis were as follows: 1) The level of satisfaction of postpartum care in the hospital (mean 1.31) was very low. The most laudable items of nursing care by category were: moderate satisfaction with 'perineal wound care' (2.04) and 'afterpain observation'(2.09). The overall level of satisfaction of postpartum care in the hospital. however, was very low. 2) Among other items of postpartum care in the hospital, 'postpartum exercise' $(25.9\%)$. 'assessment and support for postpartum depression' $(25.9\%)$, 'operation wound care for women who underwent Caesarean sections' $(24.5\%)$. and 'contraception and family planning' $(20.4\%)$ showed a need for home health care for postpartum care recipients above $20\%$. 3) The level of importance of traditional postpartum care (Sanhujori) was relatively high (mean 2.72). The importance of Sanhujori by category was as followed: 'the fourth principle: protecting the body from harmful strains' was the highest (2.88), 'the third principle: eating well', 'the first principle: invigorating the body by augmenting heat and avoiding cold', 'the second principle: resting without working', 'the fifth principle: keeping clean' and 'the sixth principle: handling with the whole heart' showed 2.85, 2.80, 2.70, 2.51 and 2.46 respectively. 4) The need for home health care with Sanhujori was very low. 5) The relationship between demographic factors and the level of satisfaction with postpartum care in the hospital was as follows: the satisfaction levels were significantly different among' delivery frequency' and 'health status' alteration after delivery'. 6) The relationship between demographic factors and the importance of the Sanhujori category was as follows: There were no significant differences in the level of importance of the first and the forth principle of Sanhujori. The level of importance of the second principle of Sanhujori was significantly different among 'income' and 'family type'. The level of importance of the third principle of Sanhujori was significantly different among 'having a boy'. The level of importance of the fifth principle of Sanhujori was significantly different among 'income' and 'feeding type'. The level of importance of the sixth principle of Sanhujori was significantly different among 'education background' and 'feeding type'. In conclusion. the findings of this study illustrate the nursing needs of postpartum care recipients. It provides a challenge to caregivers in the healthcare industry to develop a continuous postpartum care program and integrative postpartum care system that embodies the oriental and western paradigm for the promotion of women's health.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.135-138
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• 2004

This paper describes the architecture, the basic operation principle and detailed experimental results of digitally programmable high-voltage generators that can be used in monolithic low-power high-voltage bistable LCD drivers. Two different design approaches, depending on whether the application allows the use of external passive components or not, are analyzed.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 1999.02a
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• pp.182-184
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• 1999

Very simple continuous level meter with capacitive transducer for cryogenic liquid is fabricated and tested with liquid nitrogen. The principle of the level meter operation is presented.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.160.5-160
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• 2001

In the paper, a cruise control system developed for the automobile with automated mechanical transmission (AMT) is introduced. After the AMT is concisely depicted, the paper details the functions, the points of the work, the principle of operation and the design course of the cruise control system.

• 제어로봇시스템학회:학술대회논문집
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• 1989.10a
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• pp.572-576
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• 1989

Transducer interfaces computer system with electric system. It is important in electric automation system. The characteristics, sorts, component of transducer is introduced in this paper. Previously, in order to support comprehension of transducer, we explain the necessity of computer system control, system components, the principle of operation.

• Journal of Radiation Protection and Research
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• v.4 no.1
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• pp.29-35
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• 1979

Comparison of the risk of death due to radiation exposure with the same risk due to occupational hazards in other safe industries underlines the importance of the ALARA principle. The outlined responsibilities and listed examples presented here can serve as a basis for expanding and developing the concepts necessary for its successful application.

• Journal of Power Electronics
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• v.14 no.1
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• pp.22-29
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• 2014

Current sharing between modules in a converter parallel operation is very important for the reliability of the system. This paper proposes an improved droop method that can effectively improve current sharing accuracy. The proposed method adaptively adjusts the output voltage set-point of each module according to the current set-points. Unlike conventional droop control, modules share a signal line to communicate with each other. Nevertheless, since signals are simple and in digital form, the complexity of the circuitry is much less and noise immunity is much better than those of conventional methods utilizing communication. The operation principle and design procedure of the proposed method are described in detail. Results of the experiment on two boost converters operating in parallel under the specification of a TFT LCD TV panel power supply verify the validity of the proposed scheme.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.235-240
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• 2007

A large power fuel cell generation system needs a parallel operation of de-de boost converter. Therefore, this paper proposed parallel operation algorithms of de-de boost converters for the large scale fuel cell generation system of 250[kW] and the operating principle along with the control method in detail. This paper uses a maximum current sharing method as a parallel operation method and also the phase shift full bridge de-de converter as a de-de boost converter. Simulation and experimental results on two prototype converter modules of 500W show that the parallel operation method can be applied to the 250[kW] power converter.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10a
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• pp.941-946
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• 1992

Three different reflux policies are compared for a batch distillation process in which a fixed recovery with a given average purity of the distillate is required ; the first, for the constant distillate purity ; the second, for the constant reflux ratio ; finally, for the optimal reflux policy which gives the minimum operation time. The optimal reflux policy was obtained using pontryagin's maximum principle. Througy the numerical simulations for the three different binary mixtures, it was found that the time advantage of the optimal reflux operation over the constant overhead composition operation varies form 10.0 to 22.4% and the advantage over the constant reflux operation varies from 1106 to 36.6% in the three cases considered.