• Title/Summary/Keyword: Primary control

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Effect of Radical Removal of Primary and Metastatic Lesions in Gastric Cancer with Peritoneal Seeding (복막전이를 동반한 위암에서 광범위절제의 효과)

  • Kim, Young-Sik;Lee, Sang-Ho;Choi, Kyung-Hyun
    • Journal of Gastric Cancer
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    • v.1 no.3
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    • pp.136-143
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    • 2001
  • Purpose: The prognosis for gastric cancer with peritoneal seeding is very poor, and the role of surgical intervention is limited. We evaluated the effect of radical removal of primary and metastatic lesions on survival in gastric cancer with peritoneal seeding. Materials and Methods: From May 1989 to March 1999 at Kosin University Gospel Hospital, 115 patients revealed gastric cancer with peritoneal seeding but without liver or lung metastasis and without follow-up loss. The study group included 86 patients who underwent surgery for radical removal of primary gastric and metastatic peritoneal lesions. The control group included 29 patients who experienced incomplete removal of primary or metastatic lesions. Both groups received intraoperative intraperitoneal chemotherapy using mytomycin or cisplatin, and 25 patients underwent postoperative intravenous chemotherapy. Results: The median survival times in the study and the control groups were 13 months and 4 months, respectively (p<0.0001). The 1-year, 2-year, and 5-year survival rates were, respectively, $50.6\%,\;18.1\%$, and $11.3\%$ in the study group and $14.8\%,\;3.7\%$ and $0\%$ in the control group (p<0.0001). In the study group, neither postoperative intravenous chemotherapy nor microscopic invasion of the resection margin had any effect on survival, but intraoperative intraperitoneal chemotherapy and degree of peri-toneal seeding, especially the amount of peritoneal seeding, had an effect on survival. In the control group, neither intraperitoneal nor intravenous chemotherapy had any effect on survival, but resection of the primary gastric lesion improved survival. Conclusion: Radical removal of primary gastric and metastatic peritoneal lesions improved the survival rate for gastric cancer with peritoneal seeding. However, a randomized prospective study is needed to correctly evaluate the effect of intraperitoneal or intravenous chemotherapy.

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Preparation and Electrochemical Performance of 1.5 V and 3.0 V-Class Primary Film Batteries for Radio Frequency Identification (RFID)

  • Lee, Young-Gi;Choi, Min-Gyu;Kang, Kun-Young;Kim, Kwang-Man
    • Journal of Electrochemical Science and Technology
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    • v.1 no.1
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    • pp.39-44
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    • 2010
  • 1.5 V and 3.0 V-class film-type primary batteries were designed for radio frequency identification (RFID) tag. Efficient fabrication processes such as screen-printings of conducting layer ($25{\mu}m$), active material layer ($40{\mu}m$ for anode and $80{\mu}m$ for cathode), and electrolyte/separator/electrolyte layer ($100{\mu}m$), were adopted to give better performances of the 1.5 V-class film-type Leclanch$\acute{e}$ primary battery for battery-assisted passive (BAP) RFID tag. Lithium (Li) metal is used as an anode material in a 3.0 V-class film-type $MnO_2||$Li primary battery to increase the operating voltage and discharge capacity for application to active sensor tags of a radio frequency identification system. The fabricated 3.0 V-class film-type Li primary battery passes several safety tests and achieves a discharge capacity of more than 9 mAh $cm^{-2}$.

THREE-DIMENSIONAL SPACE CHANGES AFTER PREMATURE LOSS OF THE PRIMARY FIRST MOLAR: A LONGITUDINAL STUDY (제1유구치의 조기 상실로 인한 공간 변화에 대한 3차원적 분석)

  • Kim, Ji-Yeon;Jung, Da-Woon;Kwak, So-Youn;Yoo, Seung-Eun;Park, Ki-Tae
    • Journal of the korean academy of Pediatric Dentistry
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    • v.35 no.2
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    • pp.297-304
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    • 2008
  • The purpose of this study was to evaluate a 3-Dimensional laser scanner for the space analysis after loss of a primary first molar. Six children with premature loss of a primary first molar were examined using study models taken before and after the extraction. The results were as follows: 1. There was no change in primary molar space after the extraction of a maxillary primary first molar However, 2 out of 3 children experienced primary molar space loss in extraction side of a mandibular primary first molar. 2. Arch width and arch perimeter showed no difference between initial and final model. 3. All primary canines did not show any changes in inclination. Maxillary primary second molars had similar changes in both extraction and control side. However, 2 out of 3 mandibular primary second molars in extraction side showed more lingual tipping compared to control side. Mandibular permanent first molars tipped more lingually in extraction side. 4. In angulation, primary canines showed nothing of significance. Mandibular primary second molars tipped more mesially in extraction side than in control side. Maxillary permanent first molars have increased distal angulation after extraction of primary first molars in both side.

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Effective Capacity Calculation of the Electrical Energy Storage providing the Primary Frequency Control Service based on the Contribution to the Frequency Response of Power Systems (전력계통 주파수응답 기여도 기반의 전기저장장치 주파수추종서비스 유효용량 산정)

  • Lim, Hyeon Ok;Choi, Woo Yeong;Gwon, Han Na;Kook, Kyung Soo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.11
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    • pp.1561-1567
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    • 2017
  • This paper calculates the effective capacity of EES providing the primary frequency control service based on its contribution to the frequency response of the power system. The amount of governor response from conventional generators which can be replaced by the primary frequency control from EES keeping the frequency response of the power system is defined as the effective capacity. The proposed method for calculating the effective capacity of EES is verified through case studies employing Korean power system. Furthermore, the application of the effective capacity of EES to power system operation is also discussed.

Distributed Coordination Protocol for Ad Hoc Cognitive Radio Networks

  • Kim, Mi-Ryeong;Yoo, Sang-Jo
    • Journal of Communications and Networks
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    • v.14 no.1
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    • pp.51-62
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    • 2012
  • The exponential growth in wireless services has resulted in an overly crowded spectrum. The current state of spectrum allocation indicates that most usable frequencies have already been occupied. This makes one pessimistic about the feasibility of integrating emerging wireless services such as large-scale sensor networks into the existing communication infrastructure. Cognitive radio is an emerging dynamic spectrum access technology that can be used for flexibly and efficiently achieving open spectrum sharing. Cognitive radio is an intelligent wireless communication system that is aware of its radio environment and that is capable of adapting its operation to statistical variations of the radio frequency. In ad hoc cognitive radio networks, a common control channel (CCC) is usually used for supporting transmission coordination and spectrum-related information exchange. Determining a CCC in distributed networks is a challenging research issue because the spectrum availability at each ad hoc node is quite different and dynamic due to the interference between and coexistence of primary users. In this paper, we propose a novel CCC selection protocol that is implemented in a distributed way according to the appearance patterns of primary systems and connectivity among nodes. The proposed protocol minimizes the possibility of CCC disruption by primary user activities and maximizes node connectivity when the control channel is set up. It also facilitates adaptive recovery of the control channel when the primary user is detected on that channel.

Active control of vibration of cantilever beams using PZT actuators (PZT actuator를 이용한 외팔보의 능동진동제어)

  • Shin, Chang-Joo;Hong, Chin-Suk;Jeong, Weui-Bong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.247-252
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    • 2008
  • This paper presents an active vibration control of cantilever beams under disturbances by a primary force. A direct velocity feedback control using a pair of PZT actuator and a velocity sensor is considered. Variation of the stability and performance with the locations of the sensor/actuator pair is investigated. It is found that the maximum gain varies with the locations of the sensor/actuator pair significantly. The maximum gain shows a symmetric distribution along the beam length with respect to the center point, although the boundary condition of the beam is unsymmetric. The control performance is affected by the location of the primary force as well as the location of the sensor/actuator pair. The active control system can more effectively reduce the vibration when the primary force is located close to the fixed boundary.

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Active Vibration Control of Cantilever Beams Using PZT Actuators (PZT Actuator를 이용한 외팔보의 능동진동제어)

  • Shin, Chang-Joo;Hong, Chin-Suk;Jeong, Weui-Bong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.12
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    • pp.1293-1300
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    • 2008
  • This paper presents an active vibration control of cantilever beams under disturbances by a primary force. A direct velocity feedback control using a pair of PZT actuator and a velocity sensor is considered. Variation of the stability and performance with the locations of the sensor/actuator pair is investigated. It is found that the maximum gain varies with the locations of the sensor/actuator pair significantly. The maximum gain shows a symmetric distribution along the beam length with respect to the center point, although the boundary condition of the beam is unsymmetric. The control performance is affected by the location of the primary force as well as the location of the sensor/actuator pair. The active control system can more effectively reduce the vibration when the primary force is located close to the fixed boundary.

Vibration Control by Lever-type Tuned Mass Damper (레버형 질량동조감쇠기에 의한 진동제어)

  • Shim, Chul-Kwon;Eun, Hee-Chang;Kim, Jin-Bong
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.12
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    • pp.27-34
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    • 2018
  • This paper considers the seismic performance of lever-type tuned mass damper(TMD). The lever-type TMD is designed utilizing the seismic-performance of TMD and the control force required for constraining story drift. The TMD is basically designed by tuning the frequency of primary structure. Thus, the TMD plays an important role to reduce the dynamic responses. The lever-type TMD has a merit to control more displacement responses than the existing TMD due to the control forces. It is shown that the optimum design of lever-type TMD is affected by the ratio of the TMD mass with respect to the mass of the primary structure, the damping ration of the primary structure, and the length ratio of the lever. A numerical example exhibits the effectiveness of the dynamic control by the lever-type TMD and its validity is illustrated in a three-story building structure subjected to earthquake.

Secondary Indirect Constant Voltage Control Technique for Hybrid Solid State Transformer using Primary Side Information (하이브리드 반도체 변압기의 1차측 정보를 이용한 2차측 간접 정전압 제어 기법)

  • Lee, Taeyeong;Yun, Chun-Gi;Cho, Younghoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.5
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    • pp.420-423
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    • 2020
  • This study proposes an indirect constant voltage control algorithm for hybrid solid-state transformers (HSSTs) by using primary side information. Considering the structure of HSSTs, measuring voltage and current information on the primary side of a transformer is necessary to control the converter and inverter of the power converter. The secondary side output voltage is measured to apply the conventional secondary side constant voltage control algorithm, and thus, the digital control board requires the same rated insulation voltage as that of the transformer. To solve this problem, the secondary voltage of the transformer obtained from the tap voltage is used. Moreover, output voltage decreases as load increases because the proposed indirect constant voltage control scheme does not consider the cable impedance between the secondary output terminal and the load. This study also proposes a technique for compensating the secondary output voltage by using the primary current of the transformer and the resistance value of the cable. An experiment is conducted using a scale-down HSST prototype consisting of a 660 V/220 V tap transformer. The problem of the proposed indirect constant voltage control strategy and the improvement effect due to the application of the compensation method are compared using the derived experimental results.

Effects of a Self-control Promotion Program on Self-efficacy, Self-care and Physiological Indicators of Patients with Diabetes Living in Local Communities (자기조절증진 프로그램이 지역사회 당뇨병환자의 자기효능과 자가간호행위 및 생리적 지표에 미치는 영향)

  • Kim, Young-Sin;Jo, Yeon-Soon;Choo, Hyang-Im;Han, Eun-Hae;Kim, Chun-Mi
    • Journal of Korean Academy of Rural Health Nursing
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    • v.5 no.1
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    • pp.5-15
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    • 2010
  • Purpose: This study was conducted to examine the effects of a self-control promotion program on self-efficacy, self-care and physiological indicators of patients with diabetes who live in local communities. Method: This research was designed using a nonequivalent control group pre, posttest study. Data were collected from December, 2008 through March, 2009. The participants of the study consisted of 93 patients with diabetes who live in a local community. A self-control promotion program was provided for the experimental group for 12 weeks. Data were collected through self-report questionnaires and direct measurements, and analyzed using descriptive statistics, $X^2$-test, and repeated measures ANOVA. Results: There were significant differences in self-efficacy and self-care between the experimental and control groups. However, there were no significant differences in physiological indicators such as fasting blood sugar, HbA1C, BMI, and BP between the two groups. Conclusion: The results indicate that the self-control promotion program was effective in promoting self-efficacy and self-care, which are crucial factors in controlling diabetes mellitus. However, a longitudinal study needs to be done to confirm the effects of self-control promotion programs on long-term glucose control.