• Title/Summary/Keyword: Optimal Strike

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Uncertainty, View, and Hedging: Optimal Choice of Instrument and Strike for Value Maximization

  • Kwon, Oh-Sang
    • Management Science and Financial Engineering
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    • v.17 no.2
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    • pp.99-129
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    • 2011
  • This paper analytically studies how to choose hedging instrument for firms with steady operating cash flows from value maximization perspective. I derive a formula to determine option's optimal strike that makes hedged cash flow have the best monetary payoff given a hedger's view on the underlying asset. I find that not only the expected mean but also the expected standard deviation of the underlying asset in relation to the forward price and the implied volatility play a crucial role in making optimal hedging decision. Higher moments play a certain part in hedging decision but to a lesser degree.

The Optimal Allocation of Aircrafts to Targets by Using Mixed Integer Programming (혼합정수계획법을 이용한 항공기-목표물 최적할당에 관한 연구)

  • Lee, Dae-Ryeock;Yang, Jae-Hwan
    • Korean Management Science Review
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    • v.25 no.1
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    • pp.55-74
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    • 2008
  • In recent warfare, the performance improvement of air weapon systems enables an aircraft to strike multiple targets on a single sortie. Further, aircrafts attacking targets may carry out an operation as a strike package that is composed of bombers, escort aircrafts, SEAD (Suppression of Enemy Air Defenses) aircrafts and etc. In this paper, we present an aircraft allocation model that allocates multiple targets to a single sortie in the form of a strike package. A mixed integer programming is developed and solved by using a commercially available software. The new model is better than existing ones because not only it allocates aircrafts to multiple targets but also it models the concept of the strike package. We perform a computational experiment to compare the result of the new model with that of existing ones, and perform sensitivity analysis by varying a couple of important parameters.

New Mathematical Model and Parallel Hybrid Genetic Algorithm for the Optimal Assignment of Strike packages to Targets (공격편대군-표적 최적 할당을 위한 수리모형 및 병렬 하이브리드 유전자 알고리즘)

  • Kim, Heungseob;Cho, Yongnam
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.4
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    • pp.566-578
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    • 2017
  • For optimizing the operation plan when strike packages attack multiple targets, this article suggests a new mathematical model and a parallel hybrid genetic algorithm (PHGA) as a solution methodology. In the model, a package can assault multiple targets on a sortie and permitted the use of mixed munitions for a target. Furthermore, because the survival probability of a package depends on a flight route, it is formulated as a mixed integer programming which is synthesized the models for vehicle routing and weapon-target assignment. The hybrid strategy of the solution method (PHGA) is also implemented by the separation of functions of a GA and an exact solution method using ILOG CPLEX. The GA searches the flight routes of packages, and CPLEX assigns the munitions of a package to the targets on its way. The parallelism enhances the likelihood seeking the optimal solution via the collaboration among the HGAs.

A Strike and Bargaining Routing Algorithm for Energy-Efficient Wireless Sensor Networks (에너지 효율적 무선 센서 네트워크를 위한 Strike and Bargaining 라우팅 기법)

  • Ko, Seung-Woo;Jeong, Jin Hong;Kim, Seong-Lyun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37B no.12
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    • pp.1186-1194
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    • 2012
  • In order to resolve the energy efficiency in wireless sensor networks, a multihop transmission technique is utilized. However, multihop transmission in wireless sensor networks (WSN) has pros and cons. It reduces total energy consumption, while it may cause a severe decrease in network lifetime. To solve this problem, we suggest the so called strike and bargaining algorithm (SBA). The routing path is determined by wages of nodes. Each node negotiates its wage with their neighbor nodes and determine a reasonable value to reach a optimally balanced point. By analysis and simulations, we show SBA can achieve a near optimal solution.

Development of a CAD-based General Purpose Optimal Design and Its Application to Structural Shape for Fatigue Life (캐드 기반 범용 최적설계 시스템 개발 및 피로수명을 위한 구조형상최적설계에의 응용)

  • Kwak, Byung-Man;Yu, Yong-Gyun
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1340-1345
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    • 2003
  • In this paper, an integrated optimal design software system for structural components has been developed which interfaces existing commercial codes for CAD, CAE and Optimization. They include specialized optimal design software codes such as iSIGHT and VisualDOC, optimization module imbedded in CAD software developed by CAD developers, and optimal design software systems based on API of commercial CAD software. The advantages of the CAD imbedded optimal design approach and those of specialized optimal design software are taken to develop the system. The user defines optimal design formulation in the user interface for problem definition in the CAD control stage, where design variables are directly selectable from the CAD model and various properties and performance functions defined. The commercial CAD codes, Open I-DEAS are used for the development. The resulting software is minimally connected to CAD and CAE systems while keeping maximum independence from each other. This assures flexibility and freedom for problem definition. Fatigue life optimization is taken as a nontrivial application area. As a specific example, the shape design of a knuckle part of an automobile is performed, where the minimum fatigue life over the material domain in terms of the number of cycles of a curb strike are maximized under the constraint of not exceeding the current mass. The fatigue life has been improved by four times of the initial life. The developed software is illustrated to maintain the advantages of existing optimal design software systems while improving independency and flexibility.

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Technology of selective absorber coatings on solar collectors using black chromium+3 sulfate acid on substrates (흑색 황산3가크롬을 이용한 태양열 흡열판 선택흡수막 도금기술)

  • Ohm, Tae-In;Yeo, Woon-Tack;Kim, Dong-Chan
    • Journal of the Korean Solar Energy Society
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    • v.33 no.3
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    • pp.27-35
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    • 2013
  • One of the most important factors that have a large influence on performance of the solar water heater system is performance of the solar collector, more detailedly, coating technology on the surface of the solar collector, which can provide high solar absorptance and low emittance. The core of the coating technology is to coat solar selective surfaces. In this study, various performance experiments are carried out using $Cr_2(SO_4)_3{\cdot}15H_2O$ coating technology. Here, IGBT(Insulated Gate Bipolar Transistor) of 5000A-15V was used as the surface processing rectifier which can stably output power and also can control voltage and current. The plating solution mainly contains black chrome$^{+3}$ concentration, H-y Conductivity, N-u Complex, NF Additive and NC-2 Wetter. Before applying the black chrome coating on the copper plate, optimal conditions are provided by using various preprocessing methods such as removal of fat, activation, electrolytic polishing, nickel strike, copper sulfate plating and bright neckel plating, and then the automatic continuous coating experiment are performed according to plating time and cathode current density. In the experiment, after the removal of fat, chemical polishing, nickel strike and activation processes as the preprocessing methods, the black chrome coating was performed in a plate solution temperature of $28^{\circ}C$ and a cathode current density of $18A/cm^2$ for 90 seconds. The thickness of chrome and nickel on the coated plate is $0.389{\mu}m$, $159{\mu}m$ respectively. As a result of the coating experiment, it showed the most excellent performance having a high solar absorptance of 98% and a low emittance of $5{\pm}1%$ when the black chrome surface had a thickness of $0.398{\mu}m$.

Operating Room Reservation Problem Considering Patient Priority : Modified Value Iteration Method with Binary Search (환자 우선순위를 고려한 수술실 예약 : 이진검색을 활용한 수정 평가치반복법)

  • Min, Dai-Ki
    • IE interfaces
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    • v.24 no.4
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    • pp.274-280
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    • 2011
  • Delayed access to surgery may lead to deterioration in the patient condition, poor clinical outcomes, increase in the probability of emergency admission, or even death. The purpose of this work is to decide the number of patients selected from a waiting list and to schedule them in accordance with the operating room capacity in the next period. We formulate the problem as an infinite horizon Markov Decision Process (MDP), which attempts to strike a balance between the patient waiting times and overtime works. Structural properties of the proposed model are investigated to facilitate the solution procedure. The proposed procedure modifies the conventional value iteration method along with the binary search technique. An example of the optimal policy is provided, and computational results are given to show that the proposed procedure improves computational efficiency.

Optimal Design of the Igniter Transformer for the Automotive HID Lamp Ballast (순시 재점등을 위한 소형 HID램프 이그니터 변압기에 대한 연구)

  • Kim W.S.;Lee I.K.;Kim C.G.;Lee G.C.;Cho B.H.
    • Proceedings of the KIPE Conference
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    • 2004.11a
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    • pp.111-115
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    • 2004
  • In this paper, the requirements for the HID lamp igniter transformer capable of hot strike are described. A small size high voltage (HV) transformer composed of a Rod type ferrite core and aluminum foil is designed. The Electro Magnetic characteristics are simulated with Finite Element Methodology (FEM). The design guideline of the HV transformer that produces an output voltage with a peak value of 25kV and a pulse width of larger than loons for a 35W automotive HID ballast prototype is discussed as an illustrative example.

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Selective collecting device utilizing the ecological characteristics of Ephemera orientalis (Ephemeroptera: Ephemeridae) (동양하루살이(하루살이목: 하루살이과) 성충의 생태적 특성을 활용한 선택적 포집 장치)

  • Jin Seok Byeon;Seong Uk Son;Jang Ho Lee;Min Kyung Kim;Rong Jin Jung;Dong Sik Ryu;Dong Gun Kim
    • Korean Journal of Environmental Biology
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    • v.41 no.3
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    • pp.247-255
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    • 2023
  • The occurrence of sudden strike pest events in urban areas is increasing as global warming intensifies, consequently, re causing harmful impacts. Studies on these incidents are fewer in number and insufficient compared to research on other nuisances such as mosquitoes and flies. Therefore, we conducted a study on the development of a selective collection method, using a filter layer to establish a monitoring system for Ephemera orientalis (Ephemeroptera: Ephemeridae), a species frequently identified as a sudden strike pest. Three sampling points were selected along the Hangang River in Namyangju, where E. orientalis outbreaks occur. Prototypes, consisting of four layers and with a light source attached to attract insects, were installed at each sampling point. Sampling was performed every 30 minutes between 19:00 and 22:30 in the month of June. The filter interval of each layer was adjusted so that the collected mayflies were distributed into specific layers. To evaluate the collection efficiency in line with the materials and the filter intervals, the optimal collection efficiency was investigated by combining two types of layer materials (stainless and acrylic) and filter intervals (1-5 mm). The optimal conditions were as follows: The selective collection efficiency was found to be highest at 96.5% when the interval of the selective target filter was 2.0 mm and there was one upper filter.

Performance Comparison of Signal Reference Grid and Insulated/Isolated Ground Using HIFREQ Simulator (기준신호용 그리드와 절연/독립접지방식의 비교)

  • Paik, Seung-Hyun;Kim, Kyung-Chul;Choi, Jong-Ki
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.5
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    • pp.69-73
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    • 2004
  • This paper deals with the transient performance of zero signal reference grid(ZSRG) and insulated/isolated ground(IG) in case of lightning strike or surge currents in buildings. Using HIFREQ, which is a commercial code for electromagnetic field analysis, the difference of transient performances of ZSRG and IG type grounding structure have been presented based on the numerical calculations. It is expected that the quantitative and numerical calculation based analysis, which is adopted in this paper, will attribute to the selection of optimal grounding method in the intelligent buildings.